| 1 | /* tc-xtensa.c -- Assemble Xtensa instructions. |
| 2 | Copyright (C) 2003-2016 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "as.h" |
| 22 | #include <limits.h> |
| 23 | #include "sb.h" |
| 24 | #include "safe-ctype.h" |
| 25 | #include "tc-xtensa.h" |
| 26 | #include "subsegs.h" |
| 27 | #include "xtensa-relax.h" |
| 28 | #include "dwarf2dbg.h" |
| 29 | #include "xtensa-istack.h" |
| 30 | #include "struc-symbol.h" |
| 31 | #include "xtensa-config.h" |
| 32 | |
| 33 | /* Provide default values for new configuration settings. */ |
| 34 | #ifndef XSHAL_ABI |
| 35 | #define XSHAL_ABI 0 |
| 36 | #endif |
| 37 | |
| 38 | #ifndef uint32 |
| 39 | #define uint32 unsigned int |
| 40 | #endif |
| 41 | #ifndef int32 |
| 42 | #define int32 signed int |
| 43 | #endif |
| 44 | |
| 45 | /* Notes: |
| 46 | |
| 47 | Naming conventions (used somewhat inconsistently): |
| 48 | The xtensa_ functions are exported |
| 49 | The xg_ functions are internal |
| 50 | |
| 51 | We also have a couple of different extensibility mechanisms. |
| 52 | 1) The idiom replacement: |
| 53 | This is used when a line is first parsed to |
| 54 | replace an instruction pattern with another instruction |
| 55 | It is currently limited to replacements of instructions |
| 56 | with constant operands. |
| 57 | 2) The xtensa-relax.c mechanism that has stronger instruction |
| 58 | replacement patterns. When an instruction's immediate field |
| 59 | does not fit the next instruction sequence is attempted. |
| 60 | In addition, "narrow" opcodes are supported this way. */ |
| 61 | |
| 62 | |
| 63 | /* Define characters with special meanings to GAS. */ |
| 64 | const char comment_chars[] = "#"; |
| 65 | const char line_comment_chars[] = "#"; |
| 66 | const char line_separator_chars[] = ";"; |
| 67 | const char EXP_CHARS[] = "eE"; |
| 68 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| 69 | |
| 70 | |
| 71 | /* Flags to indicate whether the hardware supports the density and |
| 72 | absolute literals options. */ |
| 73 | |
| 74 | bfd_boolean density_supported = XCHAL_HAVE_DENSITY; |
| 75 | bfd_boolean absolute_literals_supported = XSHAL_USE_ABSOLUTE_LITERALS; |
| 76 | |
| 77 | static vliw_insn cur_vinsn; |
| 78 | |
| 79 | unsigned xtensa_num_pipe_stages; |
| 80 | unsigned xtensa_fetch_width = XCHAL_INST_FETCH_WIDTH; |
| 81 | |
| 82 | static enum debug_info_type xt_saved_debug_type = DEBUG_NONE; |
| 83 | |
| 84 | /* Some functions are only valid in the front end. This variable |
| 85 | allows us to assert that we haven't crossed over into the |
| 86 | back end. */ |
| 87 | static bfd_boolean past_xtensa_end = FALSE; |
| 88 | |
| 89 | /* Flags for properties of the last instruction in a segment. */ |
| 90 | #define FLAG_IS_A0_WRITER 0x1 |
| 91 | #define FLAG_IS_BAD_LOOPEND 0x2 |
| 92 | |
| 93 | |
| 94 | /* We define a special segment names ".literal" to place literals |
| 95 | into. The .fini and .init sections are special because they |
| 96 | contain code that is moved together by the linker. We give them |
| 97 | their own special .fini.literal and .init.literal sections. */ |
| 98 | |
| 99 | #define LITERAL_SECTION_NAME xtensa_section_rename (".literal") |
| 100 | #define LIT4_SECTION_NAME xtensa_section_rename (".lit4") |
| 101 | #define INIT_SECTION_NAME xtensa_section_rename (".init") |
| 102 | #define FINI_SECTION_NAME xtensa_section_rename (".fini") |
| 103 | |
| 104 | |
| 105 | /* This type is used for the directive_stack to keep track of the |
| 106 | state of the literal collection pools. If lit_prefix is set, it is |
| 107 | used to determine the literal section names; otherwise, the literal |
| 108 | sections are determined based on the current text section. The |
| 109 | lit_seg and lit4_seg fields cache these literal sections, with the |
| 110 | current_text_seg field used a tag to indicate whether the cached |
| 111 | values are valid. */ |
| 112 | |
| 113 | typedef struct lit_state_struct |
| 114 | { |
| 115 | char *lit_prefix; |
| 116 | segT current_text_seg; |
| 117 | segT lit_seg; |
| 118 | segT lit4_seg; |
| 119 | } lit_state; |
| 120 | |
| 121 | static lit_state default_lit_sections; |
| 122 | |
| 123 | |
| 124 | /* We keep a list of literal segments. The seg_list type is the node |
| 125 | for this list. The literal_head pointer is the head of the list, |
| 126 | with the literal_head_h dummy node at the start. */ |
| 127 | |
| 128 | typedef struct seg_list_struct |
| 129 | { |
| 130 | struct seg_list_struct *next; |
| 131 | segT seg; |
| 132 | } seg_list; |
| 133 | |
| 134 | static seg_list literal_head_h; |
| 135 | static seg_list *literal_head = &literal_head_h; |
| 136 | |
| 137 | |
| 138 | /* Lists of symbols. We keep a list of symbols that label the current |
| 139 | instruction, so that we can adjust the symbols when inserting alignment |
| 140 | for various instructions. We also keep a list of all the symbols on |
| 141 | literals, so that we can fix up those symbols when the literals are |
| 142 | later moved into the text sections. */ |
| 143 | |
| 144 | typedef struct sym_list_struct |
| 145 | { |
| 146 | struct sym_list_struct *next; |
| 147 | symbolS *sym; |
| 148 | } sym_list; |
| 149 | |
| 150 | static sym_list *insn_labels = NULL; |
| 151 | static sym_list *free_insn_labels = NULL; |
| 152 | static sym_list *saved_insn_labels = NULL; |
| 153 | |
| 154 | static sym_list *literal_syms; |
| 155 | |
| 156 | |
| 157 | /* Flags to determine whether to prefer const16 or l32r |
| 158 | if both options are available. */ |
| 159 | int prefer_const16 = 0; |
| 160 | int prefer_l32r = 0; |
| 161 | |
| 162 | /* Global flag to indicate when we are emitting literals. */ |
| 163 | int generating_literals = 0; |
| 164 | |
| 165 | /* The following PROPERTY table definitions are copied from |
| 166 | <elf/xtensa.h> and must be kept in sync with the code there. */ |
| 167 | |
| 168 | /* Flags in the property tables to specify whether blocks of memory |
| 169 | are literals, instructions, data, or unreachable. For |
| 170 | instructions, blocks that begin loop targets and branch targets are |
| 171 | designated. Blocks that do not allow density, instruction |
| 172 | reordering or transformation are also specified. Finally, for |
| 173 | branch targets, branch target alignment priority is included. |
| 174 | Alignment of the next block is specified in the current block |
| 175 | and the size of the current block does not include any fill required |
| 176 | to align to the next block. */ |
| 177 | |
| 178 | #define XTENSA_PROP_LITERAL 0x00000001 |
| 179 | #define XTENSA_PROP_INSN 0x00000002 |
| 180 | #define XTENSA_PROP_DATA 0x00000004 |
| 181 | #define XTENSA_PROP_UNREACHABLE 0x00000008 |
| 182 | /* Instruction only properties at beginning of code. */ |
| 183 | #define XTENSA_PROP_INSN_LOOP_TARGET 0x00000010 |
| 184 | #define XTENSA_PROP_INSN_BRANCH_TARGET 0x00000020 |
| 185 | /* Instruction only properties about code. */ |
| 186 | #define XTENSA_PROP_INSN_NO_DENSITY 0x00000040 |
| 187 | #define XTENSA_PROP_INSN_NO_REORDER 0x00000080 |
| 188 | /* Historically, NO_TRANSFORM was a property of instructions, |
| 189 | but it should apply to literals under certain circumstances. */ |
| 190 | #define XTENSA_PROP_NO_TRANSFORM 0x00000100 |
| 191 | |
| 192 | /* Branch target alignment information. This transmits information |
| 193 | to the linker optimization about the priority of aligning a |
| 194 | particular block for branch target alignment: None, low priority, |
| 195 | high priority, or required. These only need to be checked in |
| 196 | instruction blocks marked as XTENSA_PROP_INSN_BRANCH_TARGET. |
| 197 | Common usage is |
| 198 | |
| 199 | switch (GET_XTENSA_PROP_BT_ALIGN (flags)) |
| 200 | case XTENSA_PROP_BT_ALIGN_NONE: |
| 201 | case XTENSA_PROP_BT_ALIGN_LOW: |
| 202 | case XTENSA_PROP_BT_ALIGN_HIGH: |
| 203 | case XTENSA_PROP_BT_ALIGN_REQUIRE: |
| 204 | */ |
| 205 | #define XTENSA_PROP_BT_ALIGN_MASK 0x00000600 |
| 206 | |
| 207 | /* No branch target alignment. */ |
| 208 | #define XTENSA_PROP_BT_ALIGN_NONE 0x0 |
| 209 | /* Low priority branch target alignment. */ |
| 210 | #define XTENSA_PROP_BT_ALIGN_LOW 0x1 |
| 211 | /* High priority branch target alignment. */ |
| 212 | #define XTENSA_PROP_BT_ALIGN_HIGH 0x2 |
| 213 | /* Required branch target alignment. */ |
| 214 | #define XTENSA_PROP_BT_ALIGN_REQUIRE 0x3 |
| 215 | |
| 216 | #define GET_XTENSA_PROP_BT_ALIGN(flag) \ |
| 217 | (((unsigned) ((flag) & (XTENSA_PROP_BT_ALIGN_MASK))) >> 9) |
| 218 | #define SET_XTENSA_PROP_BT_ALIGN(flag, align) \ |
| 219 | (((flag) & (~XTENSA_PROP_BT_ALIGN_MASK)) | \ |
| 220 | (((align) << 9) & XTENSA_PROP_BT_ALIGN_MASK)) |
| 221 | |
| 222 | |
| 223 | /* Alignment is specified in the block BEFORE the one that needs |
| 224 | alignment. Up to 5 bits. Use GET_XTENSA_PROP_ALIGNMENT(flags) to |
| 225 | get the required alignment specified as a power of 2. Use |
| 226 | SET_XTENSA_PROP_ALIGNMENT(flags, pow2) to set the required |
| 227 | alignment. Be careful of side effects since the SET will evaluate |
| 228 | flags twice. Also, note that the SIZE of a block in the property |
| 229 | table does not include the alignment size, so the alignment fill |
| 230 | must be calculated to determine if two blocks are contiguous. |
| 231 | TEXT_ALIGN is not currently implemented but is a placeholder for a |
| 232 | possible future implementation. */ |
| 233 | |
| 234 | #define XTENSA_PROP_ALIGN 0x00000800 |
| 235 | |
| 236 | #define XTENSA_PROP_ALIGNMENT_MASK 0x0001f000 |
| 237 | |
| 238 | #define GET_XTENSA_PROP_ALIGNMENT(flag) \ |
| 239 | (((unsigned) ((flag) & (XTENSA_PROP_ALIGNMENT_MASK))) >> 12) |
| 240 | #define SET_XTENSA_PROP_ALIGNMENT(flag, align) \ |
| 241 | (((flag) & (~XTENSA_PROP_ALIGNMENT_MASK)) | \ |
| 242 | (((align) << 12) & XTENSA_PROP_ALIGNMENT_MASK)) |
| 243 | |
| 244 | #define XTENSA_PROP_INSN_ABSLIT 0x00020000 |
| 245 | |
| 246 | |
| 247 | /* Structure for saving instruction and alignment per-fragment data |
| 248 | that will be written to the object file. This structure is |
| 249 | equivalent to the actual data that will be written out to the file |
| 250 | but is easier to use. We provide a conversion to file flags |
| 251 | in frag_flags_to_number. */ |
| 252 | |
| 253 | typedef struct frag_flags_struct frag_flags; |
| 254 | |
| 255 | struct frag_flags_struct |
| 256 | { |
| 257 | /* is_literal should only be used after xtensa_move_literals. |
| 258 | If you need to check if you are generating a literal fragment, |
| 259 | then use the generating_literals global. */ |
| 260 | |
| 261 | unsigned is_literal : 1; |
| 262 | unsigned is_insn : 1; |
| 263 | unsigned is_data : 1; |
| 264 | unsigned is_unreachable : 1; |
| 265 | |
| 266 | /* is_specific_opcode implies no_transform. */ |
| 267 | unsigned is_no_transform : 1; |
| 268 | |
| 269 | struct |
| 270 | { |
| 271 | unsigned is_loop_target : 1; |
| 272 | unsigned is_branch_target : 1; /* Branch targets have a priority. */ |
| 273 | unsigned bt_align_priority : 2; |
| 274 | |
| 275 | unsigned is_no_density : 1; |
| 276 | /* no_longcalls flag does not need to be placed in the object file. */ |
| 277 | |
| 278 | unsigned is_no_reorder : 1; |
| 279 | |
| 280 | /* Uses absolute literal addressing for l32r. */ |
| 281 | unsigned is_abslit : 1; |
| 282 | } insn; |
| 283 | unsigned is_align : 1; |
| 284 | unsigned alignment : 5; |
| 285 | }; |
| 286 | |
| 287 | |
| 288 | /* Structure for saving information about a block of property data |
| 289 | for frags that have the same flags. */ |
| 290 | struct xtensa_block_info_struct |
| 291 | { |
| 292 | segT sec; |
| 293 | bfd_vma offset; |
| 294 | size_t size; |
| 295 | frag_flags flags; |
| 296 | struct xtensa_block_info_struct *next; |
| 297 | }; |
| 298 | |
| 299 | |
| 300 | /* Structure for saving the current state before emitting literals. */ |
| 301 | typedef struct emit_state_struct |
| 302 | { |
| 303 | const char *name; |
| 304 | segT now_seg; |
| 305 | subsegT now_subseg; |
| 306 | int generating_literals; |
| 307 | } emit_state; |
| 308 | |
| 309 | |
| 310 | /* Opcode placement information */ |
| 311 | |
| 312 | typedef unsigned long long bitfield; |
| 313 | #define bit_is_set(bit, bf) ((bf) & (0x01ll << (bit))) |
| 314 | #define set_bit(bit, bf) ((bf) |= (0x01ll << (bit))) |
| 315 | #define clear_bit(bit, bf) ((bf) &= ~(0x01ll << (bit))) |
| 316 | |
| 317 | #define MAX_FORMATS 32 |
| 318 | |
| 319 | typedef struct op_placement_info_struct |
| 320 | { |
| 321 | int num_formats; |
| 322 | /* A number describing how restrictive the issue is for this |
| 323 | opcode. For example, an opcode that fits lots of different |
| 324 | formats has a high freedom, as does an opcode that fits |
| 325 | only one format but many slots in that format. The most |
| 326 | restrictive is the opcode that fits only one slot in one |
| 327 | format. */ |
| 328 | int issuef; |
| 329 | xtensa_format narrowest; |
| 330 | char narrowest_size; |
| 331 | char narrowest_slot; |
| 332 | |
| 333 | /* formats is a bitfield with the Nth bit set |
| 334 | if the opcode fits in the Nth xtensa_format. */ |
| 335 | bitfield formats; |
| 336 | |
| 337 | /* slots[N]'s Mth bit is set if the op fits in the |
| 338 | Mth slot of the Nth xtensa_format. */ |
| 339 | bitfield slots[MAX_FORMATS]; |
| 340 | |
| 341 | /* A count of the number of slots in a given format |
| 342 | an op can fit (i.e., the bitcount of the slot field above). */ |
| 343 | char slots_in_format[MAX_FORMATS]; |
| 344 | |
| 345 | } op_placement_info, *op_placement_info_table; |
| 346 | |
| 347 | op_placement_info_table op_placement_table; |
| 348 | |
| 349 | |
| 350 | /* Extra expression types. */ |
| 351 | |
| 352 | #define O_pltrel O_md1 /* like O_symbol but use a PLT reloc */ |
| 353 | #define O_hi16 O_md2 /* use high 16 bits of symbolic value */ |
| 354 | #define O_lo16 O_md3 /* use low 16 bits of symbolic value */ |
| 355 | #define O_pcrel O_md4 /* value is a PC-relative offset */ |
| 356 | #define O_tlsfunc O_md5 /* TLS_FUNC/TLSDESC_FN relocation */ |
| 357 | #define O_tlsarg O_md6 /* TLS_ARG/TLSDESC_ARG relocation */ |
| 358 | #define O_tlscall O_md7 /* TLS_CALL relocation */ |
| 359 | #define O_tpoff O_md8 /* TPOFF relocation */ |
| 360 | #define O_dtpoff O_md9 /* DTPOFF relocation */ |
| 361 | |
| 362 | struct suffix_reloc_map |
| 363 | { |
| 364 | const char *suffix; |
| 365 | int length; |
| 366 | bfd_reloc_code_real_type reloc; |
| 367 | unsigned char operator; |
| 368 | }; |
| 369 | |
| 370 | #define SUFFIX_MAP(str, reloc, op) { str, sizeof (str) - 1, reloc, op } |
| 371 | |
| 372 | static struct suffix_reloc_map suffix_relocs[] = |
| 373 | { |
| 374 | SUFFIX_MAP ("l", BFD_RELOC_LO16, O_lo16), |
| 375 | SUFFIX_MAP ("h", BFD_RELOC_HI16, O_hi16), |
| 376 | SUFFIX_MAP ("plt", BFD_RELOC_XTENSA_PLT, O_pltrel), |
| 377 | SUFFIX_MAP ("pcrel", BFD_RELOC_32_PCREL, O_pcrel), |
| 378 | SUFFIX_MAP ("tlsfunc", BFD_RELOC_XTENSA_TLS_FUNC, O_tlsfunc), |
| 379 | SUFFIX_MAP ("tlsarg", BFD_RELOC_XTENSA_TLS_ARG, O_tlsarg), |
| 380 | SUFFIX_MAP ("tlscall", BFD_RELOC_XTENSA_TLS_CALL, O_tlscall), |
| 381 | SUFFIX_MAP ("tpoff", BFD_RELOC_XTENSA_TLS_TPOFF, O_tpoff), |
| 382 | SUFFIX_MAP ("dtpoff", BFD_RELOC_XTENSA_TLS_DTPOFF, O_dtpoff), |
| 383 | { (char *) 0, 0, BFD_RELOC_UNUSED, 0 } |
| 384 | }; |
| 385 | |
| 386 | |
| 387 | /* Directives. */ |
| 388 | |
| 389 | typedef enum |
| 390 | { |
| 391 | directive_none = 0, |
| 392 | directive_literal, |
| 393 | directive_density, |
| 394 | directive_transform, |
| 395 | directive_freeregs, |
| 396 | directive_longcalls, |
| 397 | directive_literal_prefix, |
| 398 | directive_schedule, |
| 399 | directive_absolute_literals, |
| 400 | directive_last_directive |
| 401 | } directiveE; |
| 402 | |
| 403 | typedef struct |
| 404 | { |
| 405 | const char *name; |
| 406 | bfd_boolean can_be_negated; |
| 407 | } directive_infoS; |
| 408 | |
| 409 | const directive_infoS directive_info[] = |
| 410 | { |
| 411 | { "none", FALSE }, |
| 412 | { "literal", FALSE }, |
| 413 | { "density", TRUE }, |
| 414 | { "transform", TRUE }, |
| 415 | { "freeregs", FALSE }, |
| 416 | { "longcalls", TRUE }, |
| 417 | { "literal_prefix", FALSE }, |
| 418 | { "schedule", TRUE }, |
| 419 | { "absolute-literals", TRUE } |
| 420 | }; |
| 421 | |
| 422 | bfd_boolean directive_state[] = |
| 423 | { |
| 424 | FALSE, /* none */ |
| 425 | FALSE, /* literal */ |
| 426 | #if !XCHAL_HAVE_DENSITY |
| 427 | FALSE, /* density */ |
| 428 | #else |
| 429 | TRUE, /* density */ |
| 430 | #endif |
| 431 | TRUE, /* transform */ |
| 432 | FALSE, /* freeregs */ |
| 433 | FALSE, /* longcalls */ |
| 434 | FALSE, /* literal_prefix */ |
| 435 | FALSE, /* schedule */ |
| 436 | #if XSHAL_USE_ABSOLUTE_LITERALS |
| 437 | TRUE /* absolute_literals */ |
| 438 | #else |
| 439 | FALSE /* absolute_literals */ |
| 440 | #endif |
| 441 | }; |
| 442 | |
| 443 | /* A circular list of all potential and actual literal pool locations |
| 444 | in a segment. */ |
| 445 | struct litpool_frag |
| 446 | { |
| 447 | struct litpool_frag *next; |
| 448 | struct litpool_frag *prev; |
| 449 | fragS *fragP; |
| 450 | addressT addr; |
| 451 | short priority; /* 1, 2, or 3 -- 1 is highest */ |
| 452 | short original_priority; |
| 453 | }; |
| 454 | |
| 455 | /* Map a segment to its litpool_frag list. */ |
| 456 | struct litpool_seg |
| 457 | { |
| 458 | struct litpool_seg *next; |
| 459 | asection *seg; |
| 460 | struct litpool_frag frag_list; |
| 461 | int frag_count; /* since last litpool location */ |
| 462 | }; |
| 463 | |
| 464 | static struct litpool_seg litpool_seg_list; |
| 465 | |
| 466 | |
| 467 | /* Directive functions. */ |
| 468 | |
| 469 | static void xtensa_begin_directive (int); |
| 470 | static void xtensa_end_directive (int); |
| 471 | static void xtensa_literal_prefix (void); |
| 472 | static void xtensa_literal_position (int); |
| 473 | static void xtensa_literal_pseudo (int); |
| 474 | static void xtensa_frequency_pseudo (int); |
| 475 | static void xtensa_elf_cons (int); |
| 476 | static void xtensa_leb128 (int); |
| 477 | |
| 478 | /* Parsing and Idiom Translation. */ |
| 479 | |
| 480 | static bfd_reloc_code_real_type xtensa_elf_suffix (char **, expressionS *); |
| 481 | |
| 482 | /* Various Other Internal Functions. */ |
| 483 | |
| 484 | extern bfd_boolean xg_is_single_relaxable_insn (TInsn *, TInsn *, bfd_boolean); |
| 485 | static bfd_boolean xg_build_to_insn (TInsn *, TInsn *, BuildInstr *); |
| 486 | static void xtensa_mark_literal_pool_location (void); |
| 487 | static addressT get_expanded_loop_offset (xtensa_opcode); |
| 488 | static fragS *get_literal_pool_location (segT); |
| 489 | static void set_literal_pool_location (segT, fragS *); |
| 490 | static void xtensa_set_frag_assembly_state (fragS *); |
| 491 | static void finish_vinsn (vliw_insn *); |
| 492 | static bfd_boolean emit_single_op (TInsn *); |
| 493 | static int total_frag_text_expansion (fragS *); |
| 494 | static bfd_boolean use_trampolines = TRUE; |
| 495 | static void xtensa_check_frag_count (void); |
| 496 | static void xtensa_create_trampoline_frag (bfd_boolean); |
| 497 | static void xtensa_maybe_create_trampoline_frag (void); |
| 498 | struct trampoline_frag; |
| 499 | static int init_trampoline_frag (struct trampoline_frag *); |
| 500 | static void xtensa_maybe_create_literal_pool_frag (bfd_boolean, bfd_boolean); |
| 501 | static bfd_boolean auto_litpools = FALSE; |
| 502 | static int auto_litpool_limit = 10000; |
| 503 | |
| 504 | /* Alignment Functions. */ |
| 505 | |
| 506 | static int get_text_align_power (unsigned); |
| 507 | static int get_text_align_max_fill_size (int, bfd_boolean, bfd_boolean); |
| 508 | static int branch_align_power (segT); |
| 509 | |
| 510 | /* Helpers for xtensa_relax_frag(). */ |
| 511 | |
| 512 | static long relax_frag_add_nop (fragS *); |
| 513 | |
| 514 | /* Accessors for additional per-subsegment information. */ |
| 515 | |
| 516 | static unsigned get_last_insn_flags (segT, subsegT); |
| 517 | static void set_last_insn_flags (segT, subsegT, unsigned, bfd_boolean); |
| 518 | static float get_subseg_total_freq (segT, subsegT); |
| 519 | static float get_subseg_target_freq (segT, subsegT); |
| 520 | static void set_subseg_freq (segT, subsegT, float, float); |
| 521 | |
| 522 | /* Segment list functions. */ |
| 523 | |
| 524 | static void xtensa_move_literals (void); |
| 525 | static void xtensa_reorder_segments (void); |
| 526 | static void xtensa_switch_to_literal_fragment (emit_state *); |
| 527 | static void xtensa_switch_to_non_abs_literal_fragment (emit_state *); |
| 528 | static void xtensa_switch_section_emit_state (emit_state *, segT, subsegT); |
| 529 | static void xtensa_restore_emit_state (emit_state *); |
| 530 | static segT cache_literal_section (bfd_boolean); |
| 531 | |
| 532 | /* Import from elf32-xtensa.c in BFD library. */ |
| 533 | |
| 534 | extern asection *xtensa_make_property_section (asection *, const char *); |
| 535 | |
| 536 | /* op_placement_info functions. */ |
| 537 | |
| 538 | static void init_op_placement_info_table (void); |
| 539 | extern bfd_boolean opcode_fits_format_slot (xtensa_opcode, xtensa_format, int); |
| 540 | static int xg_get_single_size (xtensa_opcode); |
| 541 | static xtensa_format xg_get_single_format (xtensa_opcode); |
| 542 | static int xg_get_single_slot (xtensa_opcode); |
| 543 | |
| 544 | /* TInsn and IStack functions. */ |
| 545 | |
| 546 | static bfd_boolean tinsn_has_symbolic_operands (const TInsn *); |
| 547 | static bfd_boolean tinsn_has_invalid_symbolic_operands (const TInsn *); |
| 548 | static bfd_boolean tinsn_has_complex_operands (const TInsn *); |
| 549 | static bfd_boolean tinsn_to_insnbuf (TInsn *, xtensa_insnbuf); |
| 550 | static bfd_boolean tinsn_check_arguments (const TInsn *); |
| 551 | static void tinsn_from_chars (TInsn *, char *, int); |
| 552 | static void tinsn_immed_from_frag (TInsn *, fragS *, int); |
| 553 | static int get_num_stack_text_bytes (IStack *); |
| 554 | static int get_num_stack_literal_bytes (IStack *); |
| 555 | static bfd_boolean tinsn_to_slotbuf (xtensa_format, int, TInsn *, xtensa_insnbuf); |
| 556 | |
| 557 | /* vliw_insn functions. */ |
| 558 | |
| 559 | static void xg_init_vinsn (vliw_insn *); |
| 560 | static void xg_copy_vinsn (vliw_insn *, vliw_insn *); |
| 561 | static void xg_clear_vinsn (vliw_insn *); |
| 562 | static bfd_boolean vinsn_has_specific_opcodes (vliw_insn *); |
| 563 | static void xg_free_vinsn (vliw_insn *); |
| 564 | static bfd_boolean vinsn_to_insnbuf |
| 565 | (vliw_insn *, char *, fragS *, bfd_boolean); |
| 566 | static void vinsn_from_chars (vliw_insn *, char *); |
| 567 | |
| 568 | /* Expression Utilities. */ |
| 569 | |
| 570 | bfd_boolean expr_is_const (const expressionS *); |
| 571 | offsetT get_expr_const (const expressionS *); |
| 572 | void set_expr_const (expressionS *, offsetT); |
| 573 | bfd_boolean expr_is_register (const expressionS *); |
| 574 | offsetT get_expr_register (const expressionS *); |
| 575 | void set_expr_symbol_offset (expressionS *, symbolS *, offsetT); |
| 576 | bfd_boolean expr_is_equal (expressionS *, expressionS *); |
| 577 | static void copy_expr (expressionS *, const expressionS *); |
| 578 | |
| 579 | /* Section renaming. */ |
| 580 | |
| 581 | static void build_section_rename (const char *); |
| 582 | |
| 583 | |
| 584 | /* ISA imported from bfd. */ |
| 585 | extern xtensa_isa xtensa_default_isa; |
| 586 | |
| 587 | extern int target_big_endian; |
| 588 | |
| 589 | static xtensa_opcode xtensa_addi_opcode; |
| 590 | static xtensa_opcode xtensa_addmi_opcode; |
| 591 | static xtensa_opcode xtensa_call0_opcode; |
| 592 | static xtensa_opcode xtensa_call4_opcode; |
| 593 | static xtensa_opcode xtensa_call8_opcode; |
| 594 | static xtensa_opcode xtensa_call12_opcode; |
| 595 | static xtensa_opcode xtensa_callx0_opcode; |
| 596 | static xtensa_opcode xtensa_callx4_opcode; |
| 597 | static xtensa_opcode xtensa_callx8_opcode; |
| 598 | static xtensa_opcode xtensa_callx12_opcode; |
| 599 | static xtensa_opcode xtensa_const16_opcode; |
| 600 | static xtensa_opcode xtensa_entry_opcode; |
| 601 | static xtensa_opcode xtensa_extui_opcode; |
| 602 | static xtensa_opcode xtensa_movi_opcode; |
| 603 | static xtensa_opcode xtensa_movi_n_opcode; |
| 604 | static xtensa_opcode xtensa_isync_opcode; |
| 605 | static xtensa_opcode xtensa_j_opcode; |
| 606 | static xtensa_opcode xtensa_jx_opcode; |
| 607 | static xtensa_opcode xtensa_l32r_opcode; |
| 608 | static xtensa_opcode xtensa_loop_opcode; |
| 609 | static xtensa_opcode xtensa_loopnez_opcode; |
| 610 | static xtensa_opcode xtensa_loopgtz_opcode; |
| 611 | static xtensa_opcode xtensa_nop_opcode; |
| 612 | static xtensa_opcode xtensa_nop_n_opcode; |
| 613 | static xtensa_opcode xtensa_or_opcode; |
| 614 | static xtensa_opcode xtensa_ret_opcode; |
| 615 | static xtensa_opcode xtensa_ret_n_opcode; |
| 616 | static xtensa_opcode xtensa_retw_opcode; |
| 617 | static xtensa_opcode xtensa_retw_n_opcode; |
| 618 | static xtensa_opcode xtensa_rsr_lcount_opcode; |
| 619 | static xtensa_opcode xtensa_waiti_opcode; |
| 620 | static int config_max_slots = 0; |
| 621 | |
| 622 | \f |
| 623 | /* Command-line Options. */ |
| 624 | |
| 625 | bfd_boolean use_literal_section = TRUE; |
| 626 | enum flix_level produce_flix = FLIX_ALL; |
| 627 | static bfd_boolean align_targets = TRUE; |
| 628 | static bfd_boolean warn_unaligned_branch_targets = FALSE; |
| 629 | static bfd_boolean has_a0_b_retw = FALSE; |
| 630 | static bfd_boolean workaround_a0_b_retw = FALSE; |
| 631 | static bfd_boolean workaround_b_j_loop_end = FALSE; |
| 632 | static bfd_boolean workaround_short_loop = FALSE; |
| 633 | static bfd_boolean maybe_has_short_loop = FALSE; |
| 634 | static bfd_boolean workaround_close_loop_end = FALSE; |
| 635 | static bfd_boolean maybe_has_close_loop_end = FALSE; |
| 636 | static bfd_boolean enforce_three_byte_loop_align = FALSE; |
| 637 | |
| 638 | /* When workaround_short_loops is TRUE, all loops with early exits must |
| 639 | have at least 3 instructions. workaround_all_short_loops is a modifier |
| 640 | to the workaround_short_loop flag. In addition to the |
| 641 | workaround_short_loop actions, all straightline loopgtz and loopnez |
| 642 | must have at least 3 instructions. */ |
| 643 | |
| 644 | static bfd_boolean workaround_all_short_loops = FALSE; |
| 645 | |
| 646 | |
| 647 | static void |
| 648 | xtensa_setup_hw_workarounds (int earliest, int latest) |
| 649 | { |
| 650 | if (earliest > latest) |
| 651 | as_fatal (_("illegal range of target hardware versions")); |
| 652 | |
| 653 | /* Enable all workarounds for pre-T1050.0 hardware. */ |
| 654 | if (earliest < 105000 || latest < 105000) |
| 655 | { |
| 656 | workaround_a0_b_retw |= TRUE; |
| 657 | workaround_b_j_loop_end |= TRUE; |
| 658 | workaround_short_loop |= TRUE; |
| 659 | workaround_close_loop_end |= TRUE; |
| 660 | workaround_all_short_loops |= TRUE; |
| 661 | enforce_three_byte_loop_align = TRUE; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | |
| 666 | enum |
| 667 | { |
| 668 | option_density = OPTION_MD_BASE, |
| 669 | option_no_density, |
| 670 | |
| 671 | option_flix, |
| 672 | option_no_generate_flix, |
| 673 | option_no_flix, |
| 674 | |
| 675 | option_relax, |
| 676 | option_no_relax, |
| 677 | |
| 678 | option_link_relax, |
| 679 | option_no_link_relax, |
| 680 | |
| 681 | option_generics, |
| 682 | option_no_generics, |
| 683 | |
| 684 | option_transform, |
| 685 | option_no_transform, |
| 686 | |
| 687 | option_text_section_literals, |
| 688 | option_no_text_section_literals, |
| 689 | |
| 690 | option_absolute_literals, |
| 691 | option_no_absolute_literals, |
| 692 | |
| 693 | option_align_targets, |
| 694 | option_no_align_targets, |
| 695 | |
| 696 | option_warn_unaligned_targets, |
| 697 | |
| 698 | option_longcalls, |
| 699 | option_no_longcalls, |
| 700 | |
| 701 | option_workaround_a0_b_retw, |
| 702 | option_no_workaround_a0_b_retw, |
| 703 | |
| 704 | option_workaround_b_j_loop_end, |
| 705 | option_no_workaround_b_j_loop_end, |
| 706 | |
| 707 | option_workaround_short_loop, |
| 708 | option_no_workaround_short_loop, |
| 709 | |
| 710 | option_workaround_all_short_loops, |
| 711 | option_no_workaround_all_short_loops, |
| 712 | |
| 713 | option_workaround_close_loop_end, |
| 714 | option_no_workaround_close_loop_end, |
| 715 | |
| 716 | option_no_workarounds, |
| 717 | |
| 718 | option_rename_section_name, |
| 719 | |
| 720 | option_prefer_l32r, |
| 721 | option_prefer_const16, |
| 722 | |
| 723 | option_target_hardware, |
| 724 | |
| 725 | option_trampolines, |
| 726 | option_no_trampolines, |
| 727 | |
| 728 | option_auto_litpools, |
| 729 | option_no_auto_litpools, |
| 730 | option_auto_litpool_limit, |
| 731 | }; |
| 732 | |
| 733 | const char *md_shortopts = ""; |
| 734 | |
| 735 | struct option md_longopts[] = |
| 736 | { |
| 737 | { "density", no_argument, NULL, option_density }, |
| 738 | { "no-density", no_argument, NULL, option_no_density }, |
| 739 | |
| 740 | { "flix", no_argument, NULL, option_flix }, |
| 741 | { "no-generate-flix", no_argument, NULL, option_no_generate_flix }, |
| 742 | { "no-allow-flix", no_argument, NULL, option_no_flix }, |
| 743 | |
| 744 | /* Both "relax" and "generics" are deprecated and treated as equivalent |
| 745 | to the "transform" option. */ |
| 746 | { "relax", no_argument, NULL, option_relax }, |
| 747 | { "no-relax", no_argument, NULL, option_no_relax }, |
| 748 | { "generics", no_argument, NULL, option_generics }, |
| 749 | { "no-generics", no_argument, NULL, option_no_generics }, |
| 750 | |
| 751 | { "transform", no_argument, NULL, option_transform }, |
| 752 | { "no-transform", no_argument, NULL, option_no_transform }, |
| 753 | { "text-section-literals", no_argument, NULL, option_text_section_literals }, |
| 754 | { "no-text-section-literals", no_argument, NULL, |
| 755 | option_no_text_section_literals }, |
| 756 | { "absolute-literals", no_argument, NULL, option_absolute_literals }, |
| 757 | { "no-absolute-literals", no_argument, NULL, option_no_absolute_literals }, |
| 758 | /* This option was changed from -align-target to -target-align |
| 759 | because it conflicted with the "-al" option. */ |
| 760 | { "target-align", no_argument, NULL, option_align_targets }, |
| 761 | { "no-target-align", no_argument, NULL, option_no_align_targets }, |
| 762 | { "warn-unaligned-targets", no_argument, NULL, |
| 763 | option_warn_unaligned_targets }, |
| 764 | { "longcalls", no_argument, NULL, option_longcalls }, |
| 765 | { "no-longcalls", no_argument, NULL, option_no_longcalls }, |
| 766 | |
| 767 | { "no-workaround-a0-b-retw", no_argument, NULL, |
| 768 | option_no_workaround_a0_b_retw }, |
| 769 | { "workaround-a0-b-retw", no_argument, NULL, option_workaround_a0_b_retw }, |
| 770 | |
| 771 | { "no-workaround-b-j-loop-end", no_argument, NULL, |
| 772 | option_no_workaround_b_j_loop_end }, |
| 773 | { "workaround-b-j-loop-end", no_argument, NULL, |
| 774 | option_workaround_b_j_loop_end }, |
| 775 | |
| 776 | { "no-workaround-short-loops", no_argument, NULL, |
| 777 | option_no_workaround_short_loop }, |
| 778 | { "workaround-short-loops", no_argument, NULL, |
| 779 | option_workaround_short_loop }, |
| 780 | |
| 781 | { "no-workaround-all-short-loops", no_argument, NULL, |
| 782 | option_no_workaround_all_short_loops }, |
| 783 | { "workaround-all-short-loop", no_argument, NULL, |
| 784 | option_workaround_all_short_loops }, |
| 785 | |
| 786 | { "prefer-l32r", no_argument, NULL, option_prefer_l32r }, |
| 787 | { "prefer-const16", no_argument, NULL, option_prefer_const16 }, |
| 788 | |
| 789 | { "no-workarounds", no_argument, NULL, option_no_workarounds }, |
| 790 | |
| 791 | { "no-workaround-close-loop-end", no_argument, NULL, |
| 792 | option_no_workaround_close_loop_end }, |
| 793 | { "workaround-close-loop-end", no_argument, NULL, |
| 794 | option_workaround_close_loop_end }, |
| 795 | |
| 796 | { "rename-section", required_argument, NULL, option_rename_section_name }, |
| 797 | |
| 798 | { "link-relax", no_argument, NULL, option_link_relax }, |
| 799 | { "no-link-relax", no_argument, NULL, option_no_link_relax }, |
| 800 | |
| 801 | { "target-hardware", required_argument, NULL, option_target_hardware }, |
| 802 | |
| 803 | { "trampolines", no_argument, NULL, option_trampolines }, |
| 804 | { "no-trampolines", no_argument, NULL, option_no_trampolines }, |
| 805 | |
| 806 | { "auto-litpools", no_argument, NULL, option_auto_litpools }, |
| 807 | { "no-auto-litpools", no_argument, NULL, option_no_auto_litpools }, |
| 808 | { "auto-litpool-limit", required_argument, NULL, option_auto_litpool_limit }, |
| 809 | |
| 810 | { NULL, no_argument, NULL, 0 } |
| 811 | }; |
| 812 | |
| 813 | size_t md_longopts_size = sizeof md_longopts; |
| 814 | |
| 815 | |
| 816 | int |
| 817 | md_parse_option (int c, const char *arg) |
| 818 | { |
| 819 | switch (c) |
| 820 | { |
| 821 | case option_density: |
| 822 | as_warn (_("--density option is ignored")); |
| 823 | return 1; |
| 824 | case option_no_density: |
| 825 | as_warn (_("--no-density option is ignored")); |
| 826 | return 1; |
| 827 | case option_link_relax: |
| 828 | linkrelax = 1; |
| 829 | return 1; |
| 830 | case option_no_link_relax: |
| 831 | linkrelax = 0; |
| 832 | return 1; |
| 833 | case option_flix: |
| 834 | produce_flix = FLIX_ALL; |
| 835 | return 1; |
| 836 | case option_no_generate_flix: |
| 837 | produce_flix = FLIX_NO_GENERATE; |
| 838 | return 1; |
| 839 | case option_no_flix: |
| 840 | produce_flix = FLIX_NONE; |
| 841 | return 1; |
| 842 | case option_generics: |
| 843 | as_warn (_("--generics is deprecated; use --transform instead")); |
| 844 | return md_parse_option (option_transform, arg); |
| 845 | case option_no_generics: |
| 846 | as_warn (_("--no-generics is deprecated; use --no-transform instead")); |
| 847 | return md_parse_option (option_no_transform, arg); |
| 848 | case option_relax: |
| 849 | as_warn (_("--relax is deprecated; use --transform instead")); |
| 850 | return md_parse_option (option_transform, arg); |
| 851 | case option_no_relax: |
| 852 | as_warn (_("--no-relax is deprecated; use --no-transform instead")); |
| 853 | return md_parse_option (option_no_transform, arg); |
| 854 | case option_longcalls: |
| 855 | directive_state[directive_longcalls] = TRUE; |
| 856 | return 1; |
| 857 | case option_no_longcalls: |
| 858 | directive_state[directive_longcalls] = FALSE; |
| 859 | return 1; |
| 860 | case option_text_section_literals: |
| 861 | use_literal_section = FALSE; |
| 862 | return 1; |
| 863 | case option_no_text_section_literals: |
| 864 | use_literal_section = TRUE; |
| 865 | return 1; |
| 866 | case option_absolute_literals: |
| 867 | if (!absolute_literals_supported) |
| 868 | { |
| 869 | as_fatal (_("--absolute-literals option not supported in this Xtensa configuration")); |
| 870 | return 0; |
| 871 | } |
| 872 | directive_state[directive_absolute_literals] = TRUE; |
| 873 | return 1; |
| 874 | case option_no_absolute_literals: |
| 875 | directive_state[directive_absolute_literals] = FALSE; |
| 876 | return 1; |
| 877 | |
| 878 | case option_workaround_a0_b_retw: |
| 879 | workaround_a0_b_retw = TRUE; |
| 880 | return 1; |
| 881 | case option_no_workaround_a0_b_retw: |
| 882 | workaround_a0_b_retw = FALSE; |
| 883 | return 1; |
| 884 | case option_workaround_b_j_loop_end: |
| 885 | workaround_b_j_loop_end = TRUE; |
| 886 | return 1; |
| 887 | case option_no_workaround_b_j_loop_end: |
| 888 | workaround_b_j_loop_end = FALSE; |
| 889 | return 1; |
| 890 | |
| 891 | case option_workaround_short_loop: |
| 892 | workaround_short_loop = TRUE; |
| 893 | return 1; |
| 894 | case option_no_workaround_short_loop: |
| 895 | workaround_short_loop = FALSE; |
| 896 | return 1; |
| 897 | |
| 898 | case option_workaround_all_short_loops: |
| 899 | workaround_all_short_loops = TRUE; |
| 900 | return 1; |
| 901 | case option_no_workaround_all_short_loops: |
| 902 | workaround_all_short_loops = FALSE; |
| 903 | return 1; |
| 904 | |
| 905 | case option_workaround_close_loop_end: |
| 906 | workaround_close_loop_end = TRUE; |
| 907 | return 1; |
| 908 | case option_no_workaround_close_loop_end: |
| 909 | workaround_close_loop_end = FALSE; |
| 910 | return 1; |
| 911 | |
| 912 | case option_no_workarounds: |
| 913 | workaround_a0_b_retw = FALSE; |
| 914 | workaround_b_j_loop_end = FALSE; |
| 915 | workaround_short_loop = FALSE; |
| 916 | workaround_all_short_loops = FALSE; |
| 917 | workaround_close_loop_end = FALSE; |
| 918 | return 1; |
| 919 | |
| 920 | case option_align_targets: |
| 921 | align_targets = TRUE; |
| 922 | return 1; |
| 923 | case option_no_align_targets: |
| 924 | align_targets = FALSE; |
| 925 | return 1; |
| 926 | |
| 927 | case option_warn_unaligned_targets: |
| 928 | warn_unaligned_branch_targets = TRUE; |
| 929 | return 1; |
| 930 | |
| 931 | case option_rename_section_name: |
| 932 | build_section_rename (arg); |
| 933 | return 1; |
| 934 | |
| 935 | case 'Q': |
| 936 | /* -Qy, -Qn: SVR4 arguments controlling whether a .comment section |
| 937 | should be emitted or not. FIXME: Not implemented. */ |
| 938 | return 1; |
| 939 | |
| 940 | case option_prefer_l32r: |
| 941 | if (prefer_const16) |
| 942 | as_fatal (_("prefer-l32r conflicts with prefer-const16")); |
| 943 | prefer_l32r = 1; |
| 944 | return 1; |
| 945 | |
| 946 | case option_prefer_const16: |
| 947 | if (prefer_l32r) |
| 948 | as_fatal (_("prefer-const16 conflicts with prefer-l32r")); |
| 949 | prefer_const16 = 1; |
| 950 | return 1; |
| 951 | |
| 952 | case option_target_hardware: |
| 953 | { |
| 954 | int earliest, latest = 0; |
| 955 | char *end; |
| 956 | if (*arg == 0 || *arg == '-') |
| 957 | as_fatal (_("invalid target hardware version")); |
| 958 | |
| 959 | earliest = strtol (arg, &end, 0); |
| 960 | |
| 961 | if (*end == 0) |
| 962 | latest = earliest; |
| 963 | else if (*end == '-') |
| 964 | { |
| 965 | if (*++end == 0) |
| 966 | as_fatal (_("invalid target hardware version")); |
| 967 | latest = strtol (end, &end, 0); |
| 968 | } |
| 969 | if (*end != 0) |
| 970 | as_fatal (_("invalid target hardware version")); |
| 971 | |
| 972 | xtensa_setup_hw_workarounds (earliest, latest); |
| 973 | return 1; |
| 974 | } |
| 975 | |
| 976 | case option_transform: |
| 977 | /* This option has no affect other than to use the defaults, |
| 978 | which are already set. */ |
| 979 | return 1; |
| 980 | |
| 981 | case option_no_transform: |
| 982 | /* This option turns off all transformations of any kind. |
| 983 | However, because we want to preserve the state of other |
| 984 | directives, we only change its own field. Thus, before |
| 985 | you perform any transformation, always check if transform |
| 986 | is available. If you use the functions we provide for this |
| 987 | purpose, you will be ok. */ |
| 988 | directive_state[directive_transform] = FALSE; |
| 989 | return 1; |
| 990 | |
| 991 | case option_trampolines: |
| 992 | use_trampolines = TRUE; |
| 993 | return 1; |
| 994 | |
| 995 | case option_no_trampolines: |
| 996 | use_trampolines = FALSE; |
| 997 | return 1; |
| 998 | |
| 999 | case option_auto_litpools: |
| 1000 | auto_litpools = TRUE; |
| 1001 | use_literal_section = FALSE; |
| 1002 | return 1; |
| 1003 | |
| 1004 | case option_no_auto_litpools: |
| 1005 | auto_litpools = FALSE; |
| 1006 | auto_litpool_limit = -1; |
| 1007 | return 1; |
| 1008 | |
| 1009 | case option_auto_litpool_limit: |
| 1010 | { |
| 1011 | int value = 0; |
| 1012 | char *end; |
| 1013 | if (auto_litpool_limit < 0) |
| 1014 | as_fatal (_("no-auto-litpools is incompatible with auto-litpool-limit")); |
| 1015 | if (*arg == 0 || *arg == '-') |
| 1016 | as_fatal (_("invalid auto-litpool-limit argument")); |
| 1017 | value = strtol (arg, &end, 10); |
| 1018 | if (*end != 0) |
| 1019 | as_fatal (_("invalid auto-litpool-limit argument")); |
| 1020 | if (value < 100 || value > 10000) |
| 1021 | as_fatal (_("invalid auto-litpool-limit argument (range is 100-10000)")); |
| 1022 | auto_litpool_limit = value; |
| 1023 | auto_litpools = TRUE; |
| 1024 | use_literal_section = FALSE; |
| 1025 | return 1; |
| 1026 | } |
| 1027 | |
| 1028 | default: |
| 1029 | return 0; |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | |
| 1034 | void |
| 1035 | md_show_usage (FILE *stream) |
| 1036 | { |
| 1037 | fputs ("\n\ |
| 1038 | Xtensa options:\n\ |
| 1039 | --[no-]text-section-literals\n\ |
| 1040 | [Do not] put literals in the text section\n\ |
| 1041 | --[no-]absolute-literals\n\ |
| 1042 | [Do not] default to use non-PC-relative literals\n\ |
| 1043 | --[no-]target-align [Do not] try to align branch targets\n\ |
| 1044 | --[no-]longcalls [Do not] emit 32-bit call sequences\n\ |
| 1045 | --[no-]transform [Do not] transform instructions\n\ |
| 1046 | --flix both allow hand-written and generate flix bundles\n\ |
| 1047 | --no-generate-flix allow hand-written but do not generate\n\ |
| 1048 | flix bundles\n\ |
| 1049 | --no-allow-flix neither allow hand-written nor generate\n\ |
| 1050 | flix bundles\n\ |
| 1051 | --rename-section old=new Rename section 'old' to 'new'\n\ |
| 1052 | --[no-]trampolines [Do not] generate trampolines (jumps to jumps)\n\ |
| 1053 | when jumps do not reach their targets\n\ |
| 1054 | --[no-]auto-litpools [Do not] automatically create literal pools\n\ |
| 1055 | --auto-litpool-limit=<value>\n\ |
| 1056 | (range 100-10000) Maximum number of blocks of\n\ |
| 1057 | instructions to emit between literal pool\n\ |
| 1058 | locations; implies --auto-litpools flag\n", stream); |
| 1059 | } |
| 1060 | |
| 1061 | \f |
| 1062 | /* Functions related to the list of current label symbols. */ |
| 1063 | |
| 1064 | static void |
| 1065 | xtensa_add_insn_label (symbolS *sym) |
| 1066 | { |
| 1067 | sym_list *l; |
| 1068 | |
| 1069 | if (!free_insn_labels) |
| 1070 | l = (sym_list *) xmalloc (sizeof (sym_list)); |
| 1071 | else |
| 1072 | { |
| 1073 | l = free_insn_labels; |
| 1074 | free_insn_labels = l->next; |
| 1075 | } |
| 1076 | |
| 1077 | l->sym = sym; |
| 1078 | l->next = insn_labels; |
| 1079 | insn_labels = l; |
| 1080 | } |
| 1081 | |
| 1082 | |
| 1083 | static void |
| 1084 | xtensa_clear_insn_labels (void) |
| 1085 | { |
| 1086 | sym_list **pl; |
| 1087 | |
| 1088 | for (pl = &free_insn_labels; *pl != NULL; pl = &(*pl)->next) |
| 1089 | ; |
| 1090 | *pl = insn_labels; |
| 1091 | insn_labels = NULL; |
| 1092 | } |
| 1093 | |
| 1094 | |
| 1095 | static void |
| 1096 | xtensa_move_labels (fragS *new_frag, valueT new_offset) |
| 1097 | { |
| 1098 | sym_list *lit; |
| 1099 | |
| 1100 | for (lit = insn_labels; lit; lit = lit->next) |
| 1101 | { |
| 1102 | symbolS *lit_sym = lit->sym; |
| 1103 | S_SET_VALUE (lit_sym, new_offset); |
| 1104 | symbol_set_frag (lit_sym, new_frag); |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | \f |
| 1109 | /* Directive data and functions. */ |
| 1110 | |
| 1111 | typedef struct state_stackS_struct |
| 1112 | { |
| 1113 | directiveE directive; |
| 1114 | bfd_boolean negated; |
| 1115 | bfd_boolean old_state; |
| 1116 | const char *file; |
| 1117 | unsigned int line; |
| 1118 | const void *datum; |
| 1119 | struct state_stackS_struct *prev; |
| 1120 | } state_stackS; |
| 1121 | |
| 1122 | state_stackS *directive_state_stack; |
| 1123 | |
| 1124 | const pseudo_typeS md_pseudo_table[] = |
| 1125 | { |
| 1126 | { "align", s_align_bytes, 0 }, /* Defaulting is invalid (0). */ |
| 1127 | { "literal_position", xtensa_literal_position, 0 }, |
| 1128 | { "frame", s_ignore, 0 }, /* Formerly used for STABS debugging. */ |
| 1129 | { "long", xtensa_elf_cons, 4 }, |
| 1130 | { "word", xtensa_elf_cons, 4 }, |
| 1131 | { "4byte", xtensa_elf_cons, 4 }, |
| 1132 | { "short", xtensa_elf_cons, 2 }, |
| 1133 | { "2byte", xtensa_elf_cons, 2 }, |
| 1134 | { "sleb128", xtensa_leb128, 1}, |
| 1135 | { "uleb128", xtensa_leb128, 0}, |
| 1136 | { "begin", xtensa_begin_directive, 0 }, |
| 1137 | { "end", xtensa_end_directive, 0 }, |
| 1138 | { "literal", xtensa_literal_pseudo, 0 }, |
| 1139 | { "frequency", xtensa_frequency_pseudo, 0 }, |
| 1140 | { NULL, 0, 0 }, |
| 1141 | }; |
| 1142 | |
| 1143 | |
| 1144 | static bfd_boolean |
| 1145 | use_transform (void) |
| 1146 | { |
| 1147 | /* After md_end, you should be checking frag by frag, rather |
| 1148 | than state directives. */ |
| 1149 | gas_assert (!past_xtensa_end); |
| 1150 | return directive_state[directive_transform]; |
| 1151 | } |
| 1152 | |
| 1153 | |
| 1154 | static bfd_boolean |
| 1155 | do_align_targets (void) |
| 1156 | { |
| 1157 | /* Do not use this function after md_end; just look at align_targets |
| 1158 | instead. There is no target-align directive, so alignment is either |
| 1159 | enabled for all frags or not done at all. */ |
| 1160 | gas_assert (!past_xtensa_end); |
| 1161 | return align_targets && use_transform (); |
| 1162 | } |
| 1163 | |
| 1164 | |
| 1165 | static void |
| 1166 | directive_push (directiveE directive, bfd_boolean negated, const void *datum) |
| 1167 | { |
| 1168 | const char *file; |
| 1169 | unsigned int line; |
| 1170 | state_stackS *stack = (state_stackS *) xmalloc (sizeof (state_stackS)); |
| 1171 | |
| 1172 | file = as_where (&line); |
| 1173 | |
| 1174 | stack->directive = directive; |
| 1175 | stack->negated = negated; |
| 1176 | stack->old_state = directive_state[directive]; |
| 1177 | stack->file = file; |
| 1178 | stack->line = line; |
| 1179 | stack->datum = datum; |
| 1180 | stack->prev = directive_state_stack; |
| 1181 | directive_state_stack = stack; |
| 1182 | |
| 1183 | directive_state[directive] = !negated; |
| 1184 | } |
| 1185 | |
| 1186 | |
| 1187 | static void |
| 1188 | directive_pop (directiveE *directive, |
| 1189 | bfd_boolean *negated, |
| 1190 | const char **file, |
| 1191 | unsigned int *line, |
| 1192 | const void **datum) |
| 1193 | { |
| 1194 | state_stackS *top = directive_state_stack; |
| 1195 | |
| 1196 | if (!directive_state_stack) |
| 1197 | { |
| 1198 | as_bad (_("unmatched end directive")); |
| 1199 | *directive = directive_none; |
| 1200 | return; |
| 1201 | } |
| 1202 | |
| 1203 | directive_state[directive_state_stack->directive] = top->old_state; |
| 1204 | *directive = top->directive; |
| 1205 | *negated = top->negated; |
| 1206 | *file = top->file; |
| 1207 | *line = top->line; |
| 1208 | *datum = top->datum; |
| 1209 | directive_state_stack = top->prev; |
| 1210 | free (top); |
| 1211 | } |
| 1212 | |
| 1213 | |
| 1214 | static void |
| 1215 | directive_balance (void) |
| 1216 | { |
| 1217 | while (directive_state_stack) |
| 1218 | { |
| 1219 | directiveE directive; |
| 1220 | bfd_boolean negated; |
| 1221 | const char *file; |
| 1222 | unsigned int line; |
| 1223 | const void *datum; |
| 1224 | |
| 1225 | directive_pop (&directive, &negated, &file, &line, &datum); |
| 1226 | as_warn_where ((char *) file, line, |
| 1227 | _(".begin directive with no matching .end directive")); |
| 1228 | } |
| 1229 | } |
| 1230 | |
| 1231 | |
| 1232 | static bfd_boolean |
| 1233 | inside_directive (directiveE dir) |
| 1234 | { |
| 1235 | state_stackS *top = directive_state_stack; |
| 1236 | |
| 1237 | while (top && top->directive != dir) |
| 1238 | top = top->prev; |
| 1239 | |
| 1240 | return (top != NULL); |
| 1241 | } |
| 1242 | |
| 1243 | |
| 1244 | static void |
| 1245 | get_directive (directiveE *directive, bfd_boolean *negated) |
| 1246 | { |
| 1247 | int len; |
| 1248 | unsigned i; |
| 1249 | const char *directive_string; |
| 1250 | |
| 1251 | if (strncmp (input_line_pointer, "no-", 3) != 0) |
| 1252 | *negated = FALSE; |
| 1253 | else |
| 1254 | { |
| 1255 | *negated = TRUE; |
| 1256 | input_line_pointer += 3; |
| 1257 | } |
| 1258 | |
| 1259 | len = strspn (input_line_pointer, |
| 1260 | "abcdefghijklmnopqrstuvwxyz_-/0123456789."); |
| 1261 | |
| 1262 | /* This code is a hack to make .begin [no-][generics|relax] exactly |
| 1263 | equivalent to .begin [no-]transform. We should remove it when |
| 1264 | we stop accepting those options. */ |
| 1265 | |
| 1266 | if (strncmp (input_line_pointer, "generics", strlen ("generics")) == 0) |
| 1267 | { |
| 1268 | as_warn (_("[no-]generics is deprecated; use [no-]transform instead")); |
| 1269 | directive_string = "transform"; |
| 1270 | } |
| 1271 | else if (strncmp (input_line_pointer, "relax", strlen ("relax")) == 0) |
| 1272 | { |
| 1273 | as_warn (_("[no-]relax is deprecated; use [no-]transform instead")); |
| 1274 | directive_string = "transform"; |
| 1275 | } |
| 1276 | else |
| 1277 | directive_string = input_line_pointer; |
| 1278 | |
| 1279 | for (i = 0; i < sizeof (directive_info) / sizeof (*directive_info); ++i) |
| 1280 | { |
| 1281 | if (strncmp (directive_string, directive_info[i].name, len) == 0) |
| 1282 | { |
| 1283 | input_line_pointer += len; |
| 1284 | *directive = (directiveE) i; |
| 1285 | if (*negated && !directive_info[i].can_be_negated) |
| 1286 | as_bad (_("directive %s cannot be negated"), |
| 1287 | directive_info[i].name); |
| 1288 | return; |
| 1289 | } |
| 1290 | } |
| 1291 | |
| 1292 | as_bad (_("unknown directive")); |
| 1293 | *directive = (directiveE) XTENSA_UNDEFINED; |
| 1294 | } |
| 1295 | |
| 1296 | |
| 1297 | static void |
| 1298 | xtensa_begin_directive (int ignore ATTRIBUTE_UNUSED) |
| 1299 | { |
| 1300 | directiveE directive; |
| 1301 | bfd_boolean negated; |
| 1302 | emit_state *state; |
| 1303 | lit_state *ls; |
| 1304 | |
| 1305 | get_directive (&directive, &negated); |
| 1306 | if (directive == (directiveE) XTENSA_UNDEFINED) |
| 1307 | { |
| 1308 | discard_rest_of_line (); |
| 1309 | return; |
| 1310 | } |
| 1311 | |
| 1312 | if (cur_vinsn.inside_bundle) |
| 1313 | as_bad (_("directives are not valid inside bundles")); |
| 1314 | |
| 1315 | switch (directive) |
| 1316 | { |
| 1317 | case directive_literal: |
| 1318 | if (!inside_directive (directive_literal)) |
| 1319 | { |
| 1320 | /* Previous labels go with whatever follows this directive, not with |
| 1321 | the literal, so save them now. */ |
| 1322 | saved_insn_labels = insn_labels; |
| 1323 | insn_labels = NULL; |
| 1324 | } |
| 1325 | as_warn (_(".begin literal is deprecated; use .literal instead")); |
| 1326 | state = (emit_state *) xmalloc (sizeof (emit_state)); |
| 1327 | xtensa_switch_to_literal_fragment (state); |
| 1328 | directive_push (directive_literal, negated, state); |
| 1329 | break; |
| 1330 | |
| 1331 | case directive_literal_prefix: |
| 1332 | /* Have to flush pending output because a movi relaxed to an l32r |
| 1333 | might produce a literal. */ |
| 1334 | md_flush_pending_output (); |
| 1335 | /* Check to see if the current fragment is a literal |
| 1336 | fragment. If it is, then this operation is not allowed. */ |
| 1337 | if (generating_literals) |
| 1338 | { |
| 1339 | as_bad (_("cannot set literal_prefix inside literal fragment")); |
| 1340 | return; |
| 1341 | } |
| 1342 | |
| 1343 | /* Allocate the literal state for this section and push |
| 1344 | onto the directive stack. */ |
| 1345 | ls = xmalloc (sizeof (lit_state)); |
| 1346 | gas_assert (ls); |
| 1347 | |
| 1348 | *ls = default_lit_sections; |
| 1349 | directive_push (directive_literal_prefix, negated, ls); |
| 1350 | |
| 1351 | /* Process the new prefix. */ |
| 1352 | xtensa_literal_prefix (); |
| 1353 | break; |
| 1354 | |
| 1355 | case directive_freeregs: |
| 1356 | /* This information is currently unused, but we'll accept the statement |
| 1357 | and just discard the rest of the line. This won't check the syntax, |
| 1358 | but it will accept every correct freeregs directive. */ |
| 1359 | input_line_pointer += strcspn (input_line_pointer, "\n"); |
| 1360 | directive_push (directive_freeregs, negated, 0); |
| 1361 | break; |
| 1362 | |
| 1363 | case directive_schedule: |
| 1364 | md_flush_pending_output (); |
| 1365 | frag_var (rs_fill, 0, 0, frag_now->fr_subtype, |
| 1366 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 1367 | directive_push (directive_schedule, negated, 0); |
| 1368 | xtensa_set_frag_assembly_state (frag_now); |
| 1369 | break; |
| 1370 | |
| 1371 | case directive_density: |
| 1372 | as_warn (_(".begin [no-]density is ignored")); |
| 1373 | break; |
| 1374 | |
| 1375 | case directive_absolute_literals: |
| 1376 | md_flush_pending_output (); |
| 1377 | if (!absolute_literals_supported && !negated) |
| 1378 | { |
| 1379 | as_warn (_("Xtensa absolute literals option not supported; ignored")); |
| 1380 | break; |
| 1381 | } |
| 1382 | xtensa_set_frag_assembly_state (frag_now); |
| 1383 | directive_push (directive, negated, 0); |
| 1384 | break; |
| 1385 | |
| 1386 | default: |
| 1387 | md_flush_pending_output (); |
| 1388 | xtensa_set_frag_assembly_state (frag_now); |
| 1389 | directive_push (directive, negated, 0); |
| 1390 | break; |
| 1391 | } |
| 1392 | |
| 1393 | demand_empty_rest_of_line (); |
| 1394 | } |
| 1395 | |
| 1396 | |
| 1397 | static void |
| 1398 | xtensa_end_directive (int ignore ATTRIBUTE_UNUSED) |
| 1399 | { |
| 1400 | directiveE begin_directive, end_directive; |
| 1401 | bfd_boolean begin_negated, end_negated; |
| 1402 | const char *file; |
| 1403 | unsigned int line; |
| 1404 | emit_state *state; |
| 1405 | emit_state **state_ptr; |
| 1406 | lit_state *s; |
| 1407 | |
| 1408 | if (cur_vinsn.inside_bundle) |
| 1409 | as_bad (_("directives are not valid inside bundles")); |
| 1410 | |
| 1411 | get_directive (&end_directive, &end_negated); |
| 1412 | |
| 1413 | md_flush_pending_output (); |
| 1414 | |
| 1415 | switch ((int) end_directive) |
| 1416 | { |
| 1417 | case XTENSA_UNDEFINED: |
| 1418 | discard_rest_of_line (); |
| 1419 | return; |
| 1420 | |
| 1421 | case (int) directive_density: |
| 1422 | as_warn (_(".end [no-]density is ignored")); |
| 1423 | demand_empty_rest_of_line (); |
| 1424 | break; |
| 1425 | |
| 1426 | case (int) directive_absolute_literals: |
| 1427 | if (!absolute_literals_supported && !end_negated) |
| 1428 | { |
| 1429 | as_warn (_("Xtensa absolute literals option not supported; ignored")); |
| 1430 | demand_empty_rest_of_line (); |
| 1431 | return; |
| 1432 | } |
| 1433 | break; |
| 1434 | |
| 1435 | default: |
| 1436 | break; |
| 1437 | } |
| 1438 | |
| 1439 | state_ptr = &state; /* use state_ptr to avoid type-punning warning */ |
| 1440 | directive_pop (&begin_directive, &begin_negated, &file, &line, |
| 1441 | (const void **) state_ptr); |
| 1442 | |
| 1443 | if (begin_directive != directive_none) |
| 1444 | { |
| 1445 | if (begin_directive != end_directive || begin_negated != end_negated) |
| 1446 | { |
| 1447 | as_bad (_("does not match begin %s%s at %s:%d"), |
| 1448 | begin_negated ? "no-" : "", |
| 1449 | directive_info[begin_directive].name, file, line); |
| 1450 | } |
| 1451 | else |
| 1452 | { |
| 1453 | switch (end_directive) |
| 1454 | { |
| 1455 | case directive_literal: |
| 1456 | frag_var (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 1457 | xtensa_restore_emit_state (state); |
| 1458 | xtensa_set_frag_assembly_state (frag_now); |
| 1459 | free (state); |
| 1460 | if (!inside_directive (directive_literal)) |
| 1461 | { |
| 1462 | /* Restore the list of current labels. */ |
| 1463 | xtensa_clear_insn_labels (); |
| 1464 | insn_labels = saved_insn_labels; |
| 1465 | } |
| 1466 | break; |
| 1467 | |
| 1468 | case directive_literal_prefix: |
| 1469 | /* Restore the default collection sections from saved state. */ |
| 1470 | s = (lit_state *) state; |
| 1471 | gas_assert (s); |
| 1472 | default_lit_sections = *s; |
| 1473 | |
| 1474 | /* Free the state storage. */ |
| 1475 | free (s->lit_prefix); |
| 1476 | free (s); |
| 1477 | break; |
| 1478 | |
| 1479 | case directive_schedule: |
| 1480 | case directive_freeregs: |
| 1481 | break; |
| 1482 | |
| 1483 | default: |
| 1484 | xtensa_set_frag_assembly_state (frag_now); |
| 1485 | break; |
| 1486 | } |
| 1487 | } |
| 1488 | } |
| 1489 | |
| 1490 | demand_empty_rest_of_line (); |
| 1491 | } |
| 1492 | |
| 1493 | |
| 1494 | /* Place an aligned literal fragment at the current location. */ |
| 1495 | |
| 1496 | static void |
| 1497 | xtensa_literal_position (int ignore ATTRIBUTE_UNUSED) |
| 1498 | { |
| 1499 | md_flush_pending_output (); |
| 1500 | |
| 1501 | if (inside_directive (directive_literal)) |
| 1502 | as_warn (_(".literal_position inside literal directive; ignoring")); |
| 1503 | xtensa_mark_literal_pool_location (); |
| 1504 | |
| 1505 | demand_empty_rest_of_line (); |
| 1506 | xtensa_clear_insn_labels (); |
| 1507 | } |
| 1508 | |
| 1509 | |
| 1510 | /* Support .literal label, expr, ... */ |
| 1511 | |
| 1512 | static void |
| 1513 | xtensa_literal_pseudo (int ignored ATTRIBUTE_UNUSED) |
| 1514 | { |
| 1515 | emit_state state; |
| 1516 | char *p, *base_name; |
| 1517 | char c; |
| 1518 | segT dest_seg; |
| 1519 | |
| 1520 | if (inside_directive (directive_literal)) |
| 1521 | { |
| 1522 | as_bad (_(".literal not allowed inside .begin literal region")); |
| 1523 | ignore_rest_of_line (); |
| 1524 | return; |
| 1525 | } |
| 1526 | |
| 1527 | md_flush_pending_output (); |
| 1528 | |
| 1529 | /* Previous labels go with whatever follows this directive, not with |
| 1530 | the literal, so save them now. */ |
| 1531 | saved_insn_labels = insn_labels; |
| 1532 | insn_labels = NULL; |
| 1533 | |
| 1534 | /* If we are using text-section literals, then this is the right value... */ |
| 1535 | dest_seg = now_seg; |
| 1536 | |
| 1537 | base_name = input_line_pointer; |
| 1538 | |
| 1539 | xtensa_switch_to_literal_fragment (&state); |
| 1540 | |
| 1541 | /* ...but if we aren't using text-section-literals, then we |
| 1542 | need to put them in the section we just switched to. */ |
| 1543 | if (use_literal_section || directive_state[directive_absolute_literals]) |
| 1544 | dest_seg = now_seg; |
| 1545 | |
| 1546 | /* FIXME, despite the previous comments, dest_seg is unused... */ |
| 1547 | (void) dest_seg; |
| 1548 | |
| 1549 | /* All literals are aligned to four-byte boundaries. */ |
| 1550 | frag_align (2, 0, 0); |
| 1551 | record_alignment (now_seg, 2); |
| 1552 | |
| 1553 | c = get_symbol_name (&base_name); |
| 1554 | /* Just after name is now '\0'. */ |
| 1555 | p = input_line_pointer; |
| 1556 | *p = c; |
| 1557 | SKIP_WHITESPACE_AFTER_NAME (); |
| 1558 | |
| 1559 | if (*input_line_pointer != ',' && *input_line_pointer != ':') |
| 1560 | { |
| 1561 | as_bad (_("expected comma or colon after symbol name; " |
| 1562 | "rest of line ignored")); |
| 1563 | ignore_rest_of_line (); |
| 1564 | xtensa_restore_emit_state (&state); |
| 1565 | return; |
| 1566 | } |
| 1567 | |
| 1568 | *p = 0; |
| 1569 | colon (base_name); |
| 1570 | *p = c; |
| 1571 | |
| 1572 | input_line_pointer++; /* skip ',' or ':' */ |
| 1573 | |
| 1574 | xtensa_elf_cons (4); |
| 1575 | |
| 1576 | xtensa_restore_emit_state (&state); |
| 1577 | |
| 1578 | /* Restore the list of current labels. */ |
| 1579 | xtensa_clear_insn_labels (); |
| 1580 | insn_labels = saved_insn_labels; |
| 1581 | } |
| 1582 | |
| 1583 | |
| 1584 | static void |
| 1585 | xtensa_literal_prefix (void) |
| 1586 | { |
| 1587 | char *name; |
| 1588 | int len; |
| 1589 | |
| 1590 | /* Parse the new prefix from the input_line_pointer. */ |
| 1591 | SKIP_WHITESPACE (); |
| 1592 | len = strspn (input_line_pointer, |
| 1593 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 1594 | "abcdefghijklmnopqrstuvwxyz_/0123456789.$"); |
| 1595 | |
| 1596 | /* Get a null-terminated copy of the name. */ |
| 1597 | name = xmalloc (len + 1); |
| 1598 | gas_assert (name); |
| 1599 | strncpy (name, input_line_pointer, len); |
| 1600 | name[len] = 0; |
| 1601 | |
| 1602 | /* Skip the name in the input line. */ |
| 1603 | input_line_pointer += len; |
| 1604 | |
| 1605 | default_lit_sections.lit_prefix = name; |
| 1606 | |
| 1607 | /* Clear cached literal sections, since the prefix has changed. */ |
| 1608 | default_lit_sections.lit_seg = NULL; |
| 1609 | default_lit_sections.lit4_seg = NULL; |
| 1610 | } |
| 1611 | |
| 1612 | |
| 1613 | /* Support ".frequency branch_target_frequency fall_through_frequency". */ |
| 1614 | |
| 1615 | static void |
| 1616 | xtensa_frequency_pseudo (int ignored ATTRIBUTE_UNUSED) |
| 1617 | { |
| 1618 | float fall_through_f, target_f; |
| 1619 | |
| 1620 | fall_through_f = (float) strtod (input_line_pointer, &input_line_pointer); |
| 1621 | if (fall_through_f < 0) |
| 1622 | { |
| 1623 | as_bad (_("fall through frequency must be greater than 0")); |
| 1624 | ignore_rest_of_line (); |
| 1625 | return; |
| 1626 | } |
| 1627 | |
| 1628 | target_f = (float) strtod (input_line_pointer, &input_line_pointer); |
| 1629 | if (target_f < 0) |
| 1630 | { |
| 1631 | as_bad (_("branch target frequency must be greater than 0")); |
| 1632 | ignore_rest_of_line (); |
| 1633 | return; |
| 1634 | } |
| 1635 | |
| 1636 | set_subseg_freq (now_seg, now_subseg, target_f + fall_through_f, target_f); |
| 1637 | |
| 1638 | demand_empty_rest_of_line (); |
| 1639 | } |
| 1640 | |
| 1641 | |
| 1642 | /* Like normal .long/.short/.word, except support @plt, etc. |
| 1643 | Clobbers input_line_pointer, checks end-of-line. */ |
| 1644 | |
| 1645 | static void |
| 1646 | xtensa_elf_cons (int nbytes) |
| 1647 | { |
| 1648 | expressionS exp; |
| 1649 | bfd_reloc_code_real_type reloc; |
| 1650 | |
| 1651 | md_flush_pending_output (); |
| 1652 | |
| 1653 | if (cur_vinsn.inside_bundle) |
| 1654 | as_bad (_("directives are not valid inside bundles")); |
| 1655 | |
| 1656 | if (is_it_end_of_statement ()) |
| 1657 | { |
| 1658 | demand_empty_rest_of_line (); |
| 1659 | return; |
| 1660 | } |
| 1661 | |
| 1662 | do |
| 1663 | { |
| 1664 | expression (&exp); |
| 1665 | if (exp.X_op == O_symbol |
| 1666 | && *input_line_pointer == '@' |
| 1667 | && ((reloc = xtensa_elf_suffix (&input_line_pointer, &exp)) |
| 1668 | != BFD_RELOC_NONE)) |
| 1669 | { |
| 1670 | reloc_howto_type *reloc_howto = |
| 1671 | bfd_reloc_type_lookup (stdoutput, reloc); |
| 1672 | |
| 1673 | if (reloc == BFD_RELOC_UNUSED || !reloc_howto) |
| 1674 | as_bad (_("unsupported relocation")); |
| 1675 | else if ((reloc >= BFD_RELOC_XTENSA_SLOT0_OP |
| 1676 | && reloc <= BFD_RELOC_XTENSA_SLOT14_OP) |
| 1677 | || (reloc >= BFD_RELOC_XTENSA_SLOT0_ALT |
| 1678 | && reloc <= BFD_RELOC_XTENSA_SLOT14_ALT)) |
| 1679 | as_bad (_("opcode-specific %s relocation used outside " |
| 1680 | "an instruction"), reloc_howto->name); |
| 1681 | else if (nbytes != (int) bfd_get_reloc_size (reloc_howto)) |
| 1682 | as_bad (_("%s relocations do not fit in %d bytes"), |
| 1683 | reloc_howto->name, nbytes); |
| 1684 | else if (reloc == BFD_RELOC_XTENSA_TLS_FUNC |
| 1685 | || reloc == BFD_RELOC_XTENSA_TLS_ARG |
| 1686 | || reloc == BFD_RELOC_XTENSA_TLS_CALL) |
| 1687 | as_bad (_("invalid use of %s relocation"), reloc_howto->name); |
| 1688 | else |
| 1689 | { |
| 1690 | char *p = frag_more ((int) nbytes); |
| 1691 | xtensa_set_frag_assembly_state (frag_now); |
| 1692 | fix_new_exp (frag_now, p - frag_now->fr_literal, |
| 1693 | nbytes, &exp, reloc_howto->pc_relative, reloc); |
| 1694 | } |
| 1695 | } |
| 1696 | else |
| 1697 | { |
| 1698 | xtensa_set_frag_assembly_state (frag_now); |
| 1699 | emit_expr (&exp, (unsigned int) nbytes); |
| 1700 | } |
| 1701 | } |
| 1702 | while (*input_line_pointer++ == ','); |
| 1703 | |
| 1704 | input_line_pointer--; /* Put terminator back into stream. */ |
| 1705 | demand_empty_rest_of_line (); |
| 1706 | } |
| 1707 | |
| 1708 | static bfd_boolean is_leb128_expr; |
| 1709 | |
| 1710 | static void |
| 1711 | xtensa_leb128 (int sign) |
| 1712 | { |
| 1713 | is_leb128_expr = TRUE; |
| 1714 | s_leb128 (sign); |
| 1715 | is_leb128_expr = FALSE; |
| 1716 | } |
| 1717 | |
| 1718 | \f |
| 1719 | /* Parsing and Idiom Translation. */ |
| 1720 | |
| 1721 | /* Parse @plt, etc. and return the desired relocation. */ |
| 1722 | static bfd_reloc_code_real_type |
| 1723 | xtensa_elf_suffix (char **str_p, expressionS *exp_p) |
| 1724 | { |
| 1725 | char ident[20]; |
| 1726 | char *str = *str_p; |
| 1727 | char *str2; |
| 1728 | int ch; |
| 1729 | int len; |
| 1730 | struct suffix_reloc_map *ptr; |
| 1731 | |
| 1732 | if (*str++ != '@') |
| 1733 | return BFD_RELOC_NONE; |
| 1734 | |
| 1735 | for (ch = *str, str2 = ident; |
| 1736 | (str2 < ident + sizeof (ident) - 1 |
| 1737 | && (ISALNUM (ch) || ch == '@')); |
| 1738 | ch = *++str) |
| 1739 | { |
| 1740 | *str2++ = (ISLOWER (ch)) ? ch : TOLOWER (ch); |
| 1741 | } |
| 1742 | |
| 1743 | *str2 = '\0'; |
| 1744 | len = str2 - ident; |
| 1745 | |
| 1746 | ch = ident[0]; |
| 1747 | for (ptr = &suffix_relocs[0]; ptr->length > 0; ptr++) |
| 1748 | if (ch == ptr->suffix[0] |
| 1749 | && len == ptr->length |
| 1750 | && memcmp (ident, ptr->suffix, ptr->length) == 0) |
| 1751 | { |
| 1752 | /* Now check for "identifier@suffix+constant". */ |
| 1753 | if (*str == '-' || *str == '+') |
| 1754 | { |
| 1755 | char *orig_line = input_line_pointer; |
| 1756 | expressionS new_exp; |
| 1757 | |
| 1758 | input_line_pointer = str; |
| 1759 | expression (&new_exp); |
| 1760 | if (new_exp.X_op == O_constant) |
| 1761 | { |
| 1762 | exp_p->X_add_number += new_exp.X_add_number; |
| 1763 | str = input_line_pointer; |
| 1764 | } |
| 1765 | |
| 1766 | if (&input_line_pointer != str_p) |
| 1767 | input_line_pointer = orig_line; |
| 1768 | } |
| 1769 | |
| 1770 | *str_p = str; |
| 1771 | return ptr->reloc; |
| 1772 | } |
| 1773 | |
| 1774 | return BFD_RELOC_UNUSED; |
| 1775 | } |
| 1776 | |
| 1777 | |
| 1778 | /* Find the matching operator type. */ |
| 1779 | static unsigned char |
| 1780 | map_suffix_reloc_to_operator (bfd_reloc_code_real_type reloc) |
| 1781 | { |
| 1782 | struct suffix_reloc_map *sfx; |
| 1783 | unsigned char operator = (unsigned char) -1; |
| 1784 | |
| 1785 | for (sfx = &suffix_relocs[0]; sfx->suffix; sfx++) |
| 1786 | { |
| 1787 | if (sfx->reloc == reloc) |
| 1788 | { |
| 1789 | operator = sfx->operator; |
| 1790 | break; |
| 1791 | } |
| 1792 | } |
| 1793 | gas_assert (operator != (unsigned char) -1); |
| 1794 | return operator; |
| 1795 | } |
| 1796 | |
| 1797 | |
| 1798 | /* Find the matching reloc type. */ |
| 1799 | static bfd_reloc_code_real_type |
| 1800 | map_operator_to_reloc (unsigned char operator, bfd_boolean is_literal) |
| 1801 | { |
| 1802 | struct suffix_reloc_map *sfx; |
| 1803 | bfd_reloc_code_real_type reloc = BFD_RELOC_UNUSED; |
| 1804 | |
| 1805 | for (sfx = &suffix_relocs[0]; sfx->suffix; sfx++) |
| 1806 | { |
| 1807 | if (sfx->operator == operator) |
| 1808 | { |
| 1809 | reloc = sfx->reloc; |
| 1810 | break; |
| 1811 | } |
| 1812 | } |
| 1813 | |
| 1814 | if (is_literal) |
| 1815 | { |
| 1816 | if (reloc == BFD_RELOC_XTENSA_TLS_FUNC) |
| 1817 | return BFD_RELOC_XTENSA_TLSDESC_FN; |
| 1818 | else if (reloc == BFD_RELOC_XTENSA_TLS_ARG) |
| 1819 | return BFD_RELOC_XTENSA_TLSDESC_ARG; |
| 1820 | } |
| 1821 | |
| 1822 | if (reloc == BFD_RELOC_UNUSED) |
| 1823 | return BFD_RELOC_32; |
| 1824 | |
| 1825 | return reloc; |
| 1826 | } |
| 1827 | |
| 1828 | |
| 1829 | static const char * |
| 1830 | expression_end (const char *name) |
| 1831 | { |
| 1832 | while (1) |
| 1833 | { |
| 1834 | switch (*name) |
| 1835 | { |
| 1836 | case '}': |
| 1837 | case ';': |
| 1838 | case '\0': |
| 1839 | case ',': |
| 1840 | case ':': |
| 1841 | return name; |
| 1842 | case ' ': |
| 1843 | case '\t': |
| 1844 | ++name; |
| 1845 | continue; |
| 1846 | default: |
| 1847 | return 0; |
| 1848 | } |
| 1849 | } |
| 1850 | } |
| 1851 | |
| 1852 | |
| 1853 | #define ERROR_REG_NUM ((unsigned) -1) |
| 1854 | |
| 1855 | static unsigned |
| 1856 | tc_get_register (const char *prefix) |
| 1857 | { |
| 1858 | unsigned reg; |
| 1859 | const char *next_expr; |
| 1860 | const char *old_line_pointer; |
| 1861 | |
| 1862 | SKIP_WHITESPACE (); |
| 1863 | old_line_pointer = input_line_pointer; |
| 1864 | |
| 1865 | if (*input_line_pointer == '$') |
| 1866 | ++input_line_pointer; |
| 1867 | |
| 1868 | /* Accept "sp" as a synonym for "a1". */ |
| 1869 | if (input_line_pointer[0] == 's' && input_line_pointer[1] == 'p' |
| 1870 | && expression_end (input_line_pointer + 2)) |
| 1871 | { |
| 1872 | input_line_pointer += 2; |
| 1873 | return 1; /* AR[1] */ |
| 1874 | } |
| 1875 | |
| 1876 | while (*input_line_pointer++ == *prefix++) |
| 1877 | ; |
| 1878 | --input_line_pointer; |
| 1879 | --prefix; |
| 1880 | |
| 1881 | if (*prefix) |
| 1882 | { |
| 1883 | as_bad (_("bad register name: %s"), old_line_pointer); |
| 1884 | return ERROR_REG_NUM; |
| 1885 | } |
| 1886 | |
| 1887 | if (!ISDIGIT ((unsigned char) *input_line_pointer)) |
| 1888 | { |
| 1889 | as_bad (_("bad register number: %s"), input_line_pointer); |
| 1890 | return ERROR_REG_NUM; |
| 1891 | } |
| 1892 | |
| 1893 | reg = 0; |
| 1894 | |
| 1895 | while (ISDIGIT ((int) *input_line_pointer)) |
| 1896 | reg = reg * 10 + *input_line_pointer++ - '0'; |
| 1897 | |
| 1898 | if (!(next_expr = expression_end (input_line_pointer))) |
| 1899 | { |
| 1900 | as_bad (_("bad register name: %s"), old_line_pointer); |
| 1901 | return ERROR_REG_NUM; |
| 1902 | } |
| 1903 | |
| 1904 | input_line_pointer = (char *) next_expr; |
| 1905 | |
| 1906 | return reg; |
| 1907 | } |
| 1908 | |
| 1909 | |
| 1910 | static void |
| 1911 | expression_maybe_register (xtensa_opcode opc, int opnd, expressionS *tok) |
| 1912 | { |
| 1913 | xtensa_isa isa = xtensa_default_isa; |
| 1914 | |
| 1915 | /* Check if this is an immediate operand. */ |
| 1916 | if (xtensa_operand_is_register (isa, opc, opnd) == 0) |
| 1917 | { |
| 1918 | bfd_reloc_code_real_type reloc; |
| 1919 | segT t = expression (tok); |
| 1920 | |
| 1921 | if (t == absolute_section |
| 1922 | && xtensa_operand_is_PCrelative (isa, opc, opnd) == 1) |
| 1923 | { |
| 1924 | gas_assert (tok->X_op == O_constant); |
| 1925 | tok->X_op = O_symbol; |
| 1926 | tok->X_add_symbol = &abs_symbol; |
| 1927 | } |
| 1928 | |
| 1929 | if ((tok->X_op == O_constant || tok->X_op == O_symbol) |
| 1930 | && ((reloc = xtensa_elf_suffix (&input_line_pointer, tok)) |
| 1931 | != BFD_RELOC_NONE)) |
| 1932 | { |
| 1933 | switch (reloc) |
| 1934 | { |
| 1935 | case BFD_RELOC_LO16: |
| 1936 | if (tok->X_op == O_constant) |
| 1937 | { |
| 1938 | tok->X_add_number &= 0xffff; |
| 1939 | return; |
| 1940 | } |
| 1941 | break; |
| 1942 | case BFD_RELOC_HI16: |
| 1943 | if (tok->X_op == O_constant) |
| 1944 | { |
| 1945 | tok->X_add_number = ((unsigned) tok->X_add_number) >> 16; |
| 1946 | return; |
| 1947 | } |
| 1948 | break; |
| 1949 | case BFD_RELOC_UNUSED: |
| 1950 | as_bad (_("unsupported relocation")); |
| 1951 | return; |
| 1952 | case BFD_RELOC_32_PCREL: |
| 1953 | as_bad (_("pcrel relocation not allowed in an instruction")); |
| 1954 | return; |
| 1955 | default: |
| 1956 | break; |
| 1957 | } |
| 1958 | tok->X_op = map_suffix_reloc_to_operator (reloc); |
| 1959 | } |
| 1960 | } |
| 1961 | else |
| 1962 | { |
| 1963 | xtensa_regfile opnd_rf = xtensa_operand_regfile (isa, opc, opnd); |
| 1964 | unsigned reg = tc_get_register (xtensa_regfile_shortname (isa, opnd_rf)); |
| 1965 | |
| 1966 | if (reg != ERROR_REG_NUM) /* Already errored */ |
| 1967 | { |
| 1968 | uint32 buf = reg; |
| 1969 | if (xtensa_operand_encode (isa, opc, opnd, &buf)) |
| 1970 | as_bad (_("register number out of range")); |
| 1971 | } |
| 1972 | |
| 1973 | tok->X_op = O_register; |
| 1974 | tok->X_add_symbol = 0; |
| 1975 | tok->X_add_number = reg; |
| 1976 | } |
| 1977 | } |
| 1978 | |
| 1979 | |
| 1980 | /* Split up the arguments for an opcode or pseudo-op. */ |
| 1981 | |
| 1982 | static int |
| 1983 | tokenize_arguments (char **args, char *str) |
| 1984 | { |
| 1985 | char *old_input_line_pointer; |
| 1986 | bfd_boolean saw_comma = FALSE; |
| 1987 | bfd_boolean saw_arg = FALSE; |
| 1988 | bfd_boolean saw_colon = FALSE; |
| 1989 | int num_args = 0; |
| 1990 | char *arg_end, *arg; |
| 1991 | int arg_len; |
| 1992 | |
| 1993 | /* Save and restore input_line_pointer around this function. */ |
| 1994 | old_input_line_pointer = input_line_pointer; |
| 1995 | input_line_pointer = str; |
| 1996 | |
| 1997 | while (*input_line_pointer) |
| 1998 | { |
| 1999 | SKIP_WHITESPACE (); |
| 2000 | switch (*input_line_pointer) |
| 2001 | { |
| 2002 | case '\0': |
| 2003 | case '}': |
| 2004 | goto fini; |
| 2005 | |
| 2006 | case ':': |
| 2007 | input_line_pointer++; |
| 2008 | if (saw_comma || saw_colon || !saw_arg) |
| 2009 | goto err; |
| 2010 | saw_colon = TRUE; |
| 2011 | break; |
| 2012 | |
| 2013 | case ',': |
| 2014 | input_line_pointer++; |
| 2015 | if (saw_comma || saw_colon || !saw_arg) |
| 2016 | goto err; |
| 2017 | saw_comma = TRUE; |
| 2018 | break; |
| 2019 | |
| 2020 | default: |
| 2021 | if (!saw_comma && !saw_colon && saw_arg) |
| 2022 | goto err; |
| 2023 | |
| 2024 | arg_end = input_line_pointer + 1; |
| 2025 | while (!expression_end (arg_end)) |
| 2026 | arg_end += 1; |
| 2027 | |
| 2028 | arg_len = arg_end - input_line_pointer; |
| 2029 | arg = (char *) xmalloc ((saw_colon ? 1 : 0) + arg_len + 1); |
| 2030 | args[num_args] = arg; |
| 2031 | |
| 2032 | if (saw_colon) |
| 2033 | *arg++ = ':'; |
| 2034 | strncpy (arg, input_line_pointer, arg_len); |
| 2035 | arg[arg_len] = '\0'; |
| 2036 | |
| 2037 | input_line_pointer = arg_end; |
| 2038 | num_args += 1; |
| 2039 | saw_comma = FALSE; |
| 2040 | saw_colon = FALSE; |
| 2041 | saw_arg = TRUE; |
| 2042 | break; |
| 2043 | } |
| 2044 | } |
| 2045 | |
| 2046 | fini: |
| 2047 | if (saw_comma || saw_colon) |
| 2048 | goto err; |
| 2049 | input_line_pointer = old_input_line_pointer; |
| 2050 | return num_args; |
| 2051 | |
| 2052 | err: |
| 2053 | if (saw_comma) |
| 2054 | as_bad (_("extra comma")); |
| 2055 | else if (saw_colon) |
| 2056 | as_bad (_("extra colon")); |
| 2057 | else if (!saw_arg) |
| 2058 | as_bad (_("missing argument")); |
| 2059 | else |
| 2060 | as_bad (_("missing comma or colon")); |
| 2061 | input_line_pointer = old_input_line_pointer; |
| 2062 | return -1; |
| 2063 | } |
| 2064 | |
| 2065 | |
| 2066 | /* Parse the arguments to an opcode. Return TRUE on error. */ |
| 2067 | |
| 2068 | static bfd_boolean |
| 2069 | parse_arguments (TInsn *insn, int num_args, char **arg_strings) |
| 2070 | { |
| 2071 | expressionS *tok, *last_tok; |
| 2072 | xtensa_opcode opcode = insn->opcode; |
| 2073 | bfd_boolean had_error = TRUE; |
| 2074 | xtensa_isa isa = xtensa_default_isa; |
| 2075 | int n, num_regs = 0; |
| 2076 | int opcode_operand_count; |
| 2077 | int opnd_cnt, last_opnd_cnt; |
| 2078 | unsigned int next_reg = 0; |
| 2079 | char *old_input_line_pointer; |
| 2080 | |
| 2081 | if (insn->insn_type == ITYPE_LITERAL) |
| 2082 | opcode_operand_count = 1; |
| 2083 | else |
| 2084 | opcode_operand_count = xtensa_opcode_num_operands (isa, opcode); |
| 2085 | |
| 2086 | tok = insn->tok; |
| 2087 | memset (tok, 0, sizeof (*tok) * MAX_INSN_ARGS); |
| 2088 | |
| 2089 | /* Save and restore input_line_pointer around this function. */ |
| 2090 | old_input_line_pointer = input_line_pointer; |
| 2091 | |
| 2092 | last_tok = 0; |
| 2093 | last_opnd_cnt = -1; |
| 2094 | opnd_cnt = 0; |
| 2095 | |
| 2096 | /* Skip invisible operands. */ |
| 2097 | while (xtensa_operand_is_visible (isa, opcode, opnd_cnt) == 0) |
| 2098 | { |
| 2099 | opnd_cnt += 1; |
| 2100 | tok++; |
| 2101 | } |
| 2102 | |
| 2103 | for (n = 0; n < num_args; n++) |
| 2104 | { |
| 2105 | input_line_pointer = arg_strings[n]; |
| 2106 | if (*input_line_pointer == ':') |
| 2107 | { |
| 2108 | xtensa_regfile opnd_rf; |
| 2109 | input_line_pointer++; |
| 2110 | if (num_regs == 0) |
| 2111 | goto err; |
| 2112 | gas_assert (opnd_cnt > 0); |
| 2113 | num_regs--; |
| 2114 | opnd_rf = xtensa_operand_regfile (isa, opcode, last_opnd_cnt); |
| 2115 | if (next_reg |
| 2116 | != tc_get_register (xtensa_regfile_shortname (isa, opnd_rf))) |
| 2117 | as_warn (_("incorrect register number, ignoring")); |
| 2118 | next_reg++; |
| 2119 | } |
| 2120 | else |
| 2121 | { |
| 2122 | if (opnd_cnt >= opcode_operand_count) |
| 2123 | { |
| 2124 | as_warn (_("too many arguments")); |
| 2125 | goto err; |
| 2126 | } |
| 2127 | gas_assert (opnd_cnt < MAX_INSN_ARGS); |
| 2128 | |
| 2129 | expression_maybe_register (opcode, opnd_cnt, tok); |
| 2130 | next_reg = tok->X_add_number + 1; |
| 2131 | |
| 2132 | if (tok->X_op == O_illegal || tok->X_op == O_absent) |
| 2133 | goto err; |
| 2134 | if (xtensa_operand_is_register (isa, opcode, opnd_cnt) == 1) |
| 2135 | { |
| 2136 | num_regs = xtensa_operand_num_regs (isa, opcode, opnd_cnt) - 1; |
| 2137 | /* minus 1 because we are seeing one right now */ |
| 2138 | } |
| 2139 | else |
| 2140 | num_regs = 0; |
| 2141 | |
| 2142 | last_tok = tok; |
| 2143 | last_opnd_cnt = opnd_cnt; |
| 2144 | demand_empty_rest_of_line (); |
| 2145 | |
| 2146 | do |
| 2147 | { |
| 2148 | opnd_cnt += 1; |
| 2149 | tok++; |
| 2150 | } |
| 2151 | while (xtensa_operand_is_visible (isa, opcode, opnd_cnt) == 0); |
| 2152 | } |
| 2153 | } |
| 2154 | |
| 2155 | if (num_regs > 0 && ((int) next_reg != last_tok->X_add_number + 1)) |
| 2156 | goto err; |
| 2157 | |
| 2158 | insn->ntok = tok - insn->tok; |
| 2159 | had_error = FALSE; |
| 2160 | |
| 2161 | err: |
| 2162 | input_line_pointer = old_input_line_pointer; |
| 2163 | return had_error; |
| 2164 | } |
| 2165 | |
| 2166 | |
| 2167 | static int |
| 2168 | get_invisible_operands (TInsn *insn) |
| 2169 | { |
| 2170 | xtensa_isa isa = xtensa_default_isa; |
| 2171 | static xtensa_insnbuf slotbuf = NULL; |
| 2172 | xtensa_format fmt; |
| 2173 | xtensa_opcode opc = insn->opcode; |
| 2174 | int slot, opnd, fmt_found; |
| 2175 | unsigned val; |
| 2176 | |
| 2177 | if (!slotbuf) |
| 2178 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 2179 | |
| 2180 | /* Find format/slot where this can be encoded. */ |
| 2181 | fmt_found = 0; |
| 2182 | slot = 0; |
| 2183 | for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++) |
| 2184 | { |
| 2185 | for (slot = 0; slot < xtensa_format_num_slots (isa, fmt); slot++) |
| 2186 | { |
| 2187 | if (xtensa_opcode_encode (isa, fmt, slot, slotbuf, opc) == 0) |
| 2188 | { |
| 2189 | fmt_found = 1; |
| 2190 | break; |
| 2191 | } |
| 2192 | } |
| 2193 | if (fmt_found) break; |
| 2194 | } |
| 2195 | |
| 2196 | if (!fmt_found) |
| 2197 | { |
| 2198 | as_bad (_("cannot encode opcode \"%s\""), xtensa_opcode_name (isa, opc)); |
| 2199 | return -1; |
| 2200 | } |
| 2201 | |
| 2202 | /* First encode all the visible operands |
| 2203 | (to deal with shared field operands). */ |
| 2204 | for (opnd = 0; opnd < insn->ntok; opnd++) |
| 2205 | { |
| 2206 | if (xtensa_operand_is_visible (isa, opc, opnd) == 1 |
| 2207 | && (insn->tok[opnd].X_op == O_register |
| 2208 | || insn->tok[opnd].X_op == O_constant)) |
| 2209 | { |
| 2210 | val = insn->tok[opnd].X_add_number; |
| 2211 | xtensa_operand_encode (isa, opc, opnd, &val); |
| 2212 | xtensa_operand_set_field (isa, opc, opnd, fmt, slot, slotbuf, val); |
| 2213 | } |
| 2214 | } |
| 2215 | |
| 2216 | /* Then pull out the values for the invisible ones. */ |
| 2217 | for (opnd = 0; opnd < insn->ntok; opnd++) |
| 2218 | { |
| 2219 | if (xtensa_operand_is_visible (isa, opc, opnd) == 0) |
| 2220 | { |
| 2221 | xtensa_operand_get_field (isa, opc, opnd, fmt, slot, slotbuf, &val); |
| 2222 | xtensa_operand_decode (isa, opc, opnd, &val); |
| 2223 | insn->tok[opnd].X_add_number = val; |
| 2224 | if (xtensa_operand_is_register (isa, opc, opnd) == 1) |
| 2225 | insn->tok[opnd].X_op = O_register; |
| 2226 | else |
| 2227 | insn->tok[opnd].X_op = O_constant; |
| 2228 | } |
| 2229 | } |
| 2230 | |
| 2231 | return 0; |
| 2232 | } |
| 2233 | |
| 2234 | |
| 2235 | static void |
| 2236 | xg_reverse_shift_count (char **cnt_argp) |
| 2237 | { |
| 2238 | char *cnt_arg, *new_arg; |
| 2239 | cnt_arg = *cnt_argp; |
| 2240 | |
| 2241 | /* replace the argument with "31-(argument)" */ |
| 2242 | new_arg = (char *) xmalloc (strlen (cnt_arg) + 6); |
| 2243 | sprintf (new_arg, "31-(%s)", cnt_arg); |
| 2244 | |
| 2245 | free (cnt_arg); |
| 2246 | *cnt_argp = new_arg; |
| 2247 | } |
| 2248 | |
| 2249 | |
| 2250 | /* If "arg" is a constant expression, return non-zero with the value |
| 2251 | in *valp. */ |
| 2252 | |
| 2253 | static int |
| 2254 | xg_arg_is_constant (char *arg, offsetT *valp) |
| 2255 | { |
| 2256 | expressionS exp; |
| 2257 | char *save_ptr = input_line_pointer; |
| 2258 | |
| 2259 | input_line_pointer = arg; |
| 2260 | expression (&exp); |
| 2261 | input_line_pointer = save_ptr; |
| 2262 | |
| 2263 | if (exp.X_op == O_constant) |
| 2264 | { |
| 2265 | *valp = exp.X_add_number; |
| 2266 | return 1; |
| 2267 | } |
| 2268 | |
| 2269 | return 0; |
| 2270 | } |
| 2271 | |
| 2272 | |
| 2273 | static void |
| 2274 | xg_replace_opname (char **popname, const char *newop) |
| 2275 | { |
| 2276 | free (*popname); |
| 2277 | *popname = xstrdup (newop); |
| 2278 | } |
| 2279 | |
| 2280 | |
| 2281 | static int |
| 2282 | xg_check_num_args (int *pnum_args, |
| 2283 | int expected_num, |
| 2284 | char *opname, |
| 2285 | char **arg_strings) |
| 2286 | { |
| 2287 | int num_args = *pnum_args; |
| 2288 | |
| 2289 | if (num_args < expected_num) |
| 2290 | { |
| 2291 | as_bad (_("not enough operands (%d) for '%s'; expected %d"), |
| 2292 | num_args, opname, expected_num); |
| 2293 | return -1; |
| 2294 | } |
| 2295 | |
| 2296 | if (num_args > expected_num) |
| 2297 | { |
| 2298 | as_warn (_("too many operands (%d) for '%s'; expected %d"), |
| 2299 | num_args, opname, expected_num); |
| 2300 | while (num_args-- > expected_num) |
| 2301 | { |
| 2302 | free (arg_strings[num_args]); |
| 2303 | arg_strings[num_args] = 0; |
| 2304 | } |
| 2305 | *pnum_args = expected_num; |
| 2306 | return -1; |
| 2307 | } |
| 2308 | |
| 2309 | return 0; |
| 2310 | } |
| 2311 | |
| 2312 | |
| 2313 | /* If the register is not specified as part of the opcode, |
| 2314 | then get it from the operand and move it to the opcode. */ |
| 2315 | |
| 2316 | static int |
| 2317 | xg_translate_sysreg_op (char **popname, int *pnum_args, char **arg_strings) |
| 2318 | { |
| 2319 | xtensa_isa isa = xtensa_default_isa; |
| 2320 | xtensa_sysreg sr; |
| 2321 | char *opname, *new_opname; |
| 2322 | const char *sr_name; |
| 2323 | int is_user, is_write; |
| 2324 | |
| 2325 | opname = *popname; |
| 2326 | if (*opname == '_') |
| 2327 | opname += 1; |
| 2328 | is_user = (opname[1] == 'u'); |
| 2329 | is_write = (opname[0] == 'w'); |
| 2330 | |
| 2331 | /* Opname == [rw]ur or [rwx]sr... */ |
| 2332 | |
| 2333 | if (xg_check_num_args (pnum_args, 2, opname, arg_strings)) |
| 2334 | return -1; |
| 2335 | |
| 2336 | /* Check if the argument is a symbolic register name. */ |
| 2337 | sr = xtensa_sysreg_lookup_name (isa, arg_strings[1]); |
| 2338 | /* Handle WSR to "INTSET" as a special case. */ |
| 2339 | if (sr == XTENSA_UNDEFINED && is_write && !is_user |
| 2340 | && !strcasecmp (arg_strings[1], "intset")) |
| 2341 | sr = xtensa_sysreg_lookup_name (isa, "interrupt"); |
| 2342 | if (sr == XTENSA_UNDEFINED |
| 2343 | || (xtensa_sysreg_is_user (isa, sr) == 1) != is_user) |
| 2344 | { |
| 2345 | /* Maybe it's a register number.... */ |
| 2346 | offsetT val; |
| 2347 | if (!xg_arg_is_constant (arg_strings[1], &val)) |
| 2348 | { |
| 2349 | as_bad (_("invalid register '%s' for '%s' instruction"), |
| 2350 | arg_strings[1], opname); |
| 2351 | return -1; |
| 2352 | } |
| 2353 | sr = xtensa_sysreg_lookup (isa, val, is_user); |
| 2354 | if (sr == XTENSA_UNDEFINED) |
| 2355 | { |
| 2356 | as_bad (_("invalid register number (%ld) for '%s' instruction"), |
| 2357 | (long) val, opname); |
| 2358 | return -1; |
| 2359 | } |
| 2360 | } |
| 2361 | |
| 2362 | /* Remove the last argument, which is now part of the opcode. */ |
| 2363 | free (arg_strings[1]); |
| 2364 | arg_strings[1] = 0; |
| 2365 | *pnum_args = 1; |
| 2366 | |
| 2367 | /* Translate the opcode. */ |
| 2368 | sr_name = xtensa_sysreg_name (isa, sr); |
| 2369 | /* Another special case for "WSR.INTSET".... */ |
| 2370 | if (is_write && !is_user && !strcasecmp ("interrupt", sr_name)) |
| 2371 | sr_name = "intset"; |
| 2372 | new_opname = concat (*popname, ".", sr_name, (char *) NULL); |
| 2373 | free (*popname); |
| 2374 | *popname = new_opname; |
| 2375 | |
| 2376 | return 0; |
| 2377 | } |
| 2378 | |
| 2379 | |
| 2380 | static int |
| 2381 | xtensa_translate_old_userreg_ops (char **popname) |
| 2382 | { |
| 2383 | xtensa_isa isa = xtensa_default_isa; |
| 2384 | xtensa_sysreg sr; |
| 2385 | char *opname, *new_opname; |
| 2386 | const char *sr_name; |
| 2387 | bfd_boolean has_underbar = FALSE; |
| 2388 | |
| 2389 | opname = *popname; |
| 2390 | if (opname[0] == '_') |
| 2391 | { |
| 2392 | has_underbar = TRUE; |
| 2393 | opname += 1; |
| 2394 | } |
| 2395 | |
| 2396 | sr = xtensa_sysreg_lookup_name (isa, opname + 1); |
| 2397 | if (sr != XTENSA_UNDEFINED) |
| 2398 | { |
| 2399 | /* The new default name ("nnn") is different from the old default |
| 2400 | name ("URnnn"). The old default is handled below, and we don't |
| 2401 | want to recognize [RW]nnn, so do nothing if the name is the (new) |
| 2402 | default. */ |
| 2403 | static char namebuf[10]; |
| 2404 | sprintf (namebuf, "%d", xtensa_sysreg_number (isa, sr)); |
| 2405 | if (strcmp (namebuf, opname + 1) == 0) |
| 2406 | return 0; |
| 2407 | } |
| 2408 | else |
| 2409 | { |
| 2410 | offsetT val; |
| 2411 | char *end; |
| 2412 | |
| 2413 | /* Only continue if the reg name is "URnnn". */ |
| 2414 | if (opname[1] != 'u' || opname[2] != 'r') |
| 2415 | return 0; |
| 2416 | val = strtoul (opname + 3, &end, 10); |
| 2417 | if (*end != '\0') |
| 2418 | return 0; |
| 2419 | |
| 2420 | sr = xtensa_sysreg_lookup (isa, val, 1); |
| 2421 | if (sr == XTENSA_UNDEFINED) |
| 2422 | { |
| 2423 | as_bad (_("invalid register number (%ld) for '%s'"), |
| 2424 | (long) val, opname); |
| 2425 | return -1; |
| 2426 | } |
| 2427 | } |
| 2428 | |
| 2429 | /* Translate the opcode. */ |
| 2430 | sr_name = xtensa_sysreg_name (isa, sr); |
| 2431 | new_opname = (char *) xmalloc (strlen (sr_name) + 6); |
| 2432 | sprintf (new_opname, "%s%cur.%s", (has_underbar ? "_" : ""), |
| 2433 | opname[0], sr_name); |
| 2434 | free (*popname); |
| 2435 | *popname = new_opname; |
| 2436 | |
| 2437 | return 0; |
| 2438 | } |
| 2439 | |
| 2440 | |
| 2441 | static int |
| 2442 | xtensa_translate_zero_immed (const char *old_op, |
| 2443 | const char *new_op, |
| 2444 | char **popname, |
| 2445 | int *pnum_args, |
| 2446 | char **arg_strings) |
| 2447 | { |
| 2448 | char *opname; |
| 2449 | offsetT val; |
| 2450 | |
| 2451 | opname = *popname; |
| 2452 | gas_assert (opname[0] != '_'); |
| 2453 | |
| 2454 | if (strcmp (opname, old_op) != 0) |
| 2455 | return 0; |
| 2456 | |
| 2457 | if (xg_check_num_args (pnum_args, 3, opname, arg_strings)) |
| 2458 | return -1; |
| 2459 | if (xg_arg_is_constant (arg_strings[1], &val) && val == 0) |
| 2460 | { |
| 2461 | xg_replace_opname (popname, new_op); |
| 2462 | free (arg_strings[1]); |
| 2463 | arg_strings[1] = arg_strings[2]; |
| 2464 | arg_strings[2] = 0; |
| 2465 | *pnum_args = 2; |
| 2466 | } |
| 2467 | |
| 2468 | return 0; |
| 2469 | } |
| 2470 | |
| 2471 | |
| 2472 | /* If the instruction is an idiom (i.e., a built-in macro), translate it. |
| 2473 | Returns non-zero if an error was found. */ |
| 2474 | |
| 2475 | static int |
| 2476 | xg_translate_idioms (char **popname, int *pnum_args, char **arg_strings) |
| 2477 | { |
| 2478 | char *opname = *popname; |
| 2479 | bfd_boolean has_underbar = FALSE; |
| 2480 | |
| 2481 | if (*opname == '_') |
| 2482 | { |
| 2483 | has_underbar = TRUE; |
| 2484 | opname += 1; |
| 2485 | } |
| 2486 | |
| 2487 | if (strcmp (opname, "mov") == 0) |
| 2488 | { |
| 2489 | if (use_transform () && !has_underbar && density_supported) |
| 2490 | xg_replace_opname (popname, "mov.n"); |
| 2491 | else |
| 2492 | { |
| 2493 | if (xg_check_num_args (pnum_args, 2, opname, arg_strings)) |
| 2494 | return -1; |
| 2495 | xg_replace_opname (popname, (has_underbar ? "_or" : "or")); |
| 2496 | arg_strings[2] = xstrdup (arg_strings[1]); |
| 2497 | *pnum_args = 3; |
| 2498 | } |
| 2499 | return 0; |
| 2500 | } |
| 2501 | |
| 2502 | if (strcmp (opname, "bbsi.l") == 0) |
| 2503 | { |
| 2504 | if (xg_check_num_args (pnum_args, 3, opname, arg_strings)) |
| 2505 | return -1; |
| 2506 | xg_replace_opname (popname, (has_underbar ? "_bbsi" : "bbsi")); |
| 2507 | if (target_big_endian) |
| 2508 | xg_reverse_shift_count (&arg_strings[1]); |
| 2509 | return 0; |
| 2510 | } |
| 2511 | |
| 2512 | if (strcmp (opname, "bbci.l") == 0) |
| 2513 | { |
| 2514 | if (xg_check_num_args (pnum_args, 3, opname, arg_strings)) |
| 2515 | return -1; |
| 2516 | xg_replace_opname (popname, (has_underbar ? "_bbci" : "bbci")); |
| 2517 | if (target_big_endian) |
| 2518 | xg_reverse_shift_count (&arg_strings[1]); |
| 2519 | return 0; |
| 2520 | } |
| 2521 | |
| 2522 | /* Don't do anything special with NOPs inside FLIX instructions. They |
| 2523 | are handled elsewhere. Real NOP instructions are always available |
| 2524 | in configurations with FLIX, so this should never be an issue but |
| 2525 | check for it anyway. */ |
| 2526 | if (!cur_vinsn.inside_bundle && xtensa_nop_opcode == XTENSA_UNDEFINED |
| 2527 | && strcmp (opname, "nop") == 0) |
| 2528 | { |
| 2529 | if (use_transform () && !has_underbar && density_supported) |
| 2530 | xg_replace_opname (popname, "nop.n"); |
| 2531 | else |
| 2532 | { |
| 2533 | if (xg_check_num_args (pnum_args, 0, opname, arg_strings)) |
| 2534 | return -1; |
| 2535 | xg_replace_opname (popname, (has_underbar ? "_or" : "or")); |
| 2536 | arg_strings[0] = xstrdup ("a1"); |
| 2537 | arg_strings[1] = xstrdup ("a1"); |
| 2538 | arg_strings[2] = xstrdup ("a1"); |
| 2539 | *pnum_args = 3; |
| 2540 | } |
| 2541 | return 0; |
| 2542 | } |
| 2543 | |
| 2544 | /* Recognize [RW]UR and [RWX]SR. */ |
| 2545 | if ((((opname[0] == 'r' || opname[0] == 'w') |
| 2546 | && (opname[1] == 'u' || opname[1] == 's')) |
| 2547 | || (opname[0] == 'x' && opname[1] == 's')) |
| 2548 | && opname[2] == 'r' |
| 2549 | && opname[3] == '\0') |
| 2550 | return xg_translate_sysreg_op (popname, pnum_args, arg_strings); |
| 2551 | |
| 2552 | /* Backward compatibility for RUR and WUR: Recognize [RW]UR<nnn> and |
| 2553 | [RW]<name> if <name> is the non-default name of a user register. */ |
| 2554 | if ((opname[0] == 'r' || opname[0] == 'w') |
| 2555 | && xtensa_opcode_lookup (xtensa_default_isa, opname) == XTENSA_UNDEFINED) |
| 2556 | return xtensa_translate_old_userreg_ops (popname); |
| 2557 | |
| 2558 | /* Relax branches that don't allow comparisons against an immediate value |
| 2559 | of zero to the corresponding branches with implicit zero immediates. */ |
| 2560 | if (!has_underbar && use_transform ()) |
| 2561 | { |
| 2562 | if (xtensa_translate_zero_immed ("bnei", "bnez", popname, |
| 2563 | pnum_args, arg_strings)) |
| 2564 | return -1; |
| 2565 | |
| 2566 | if (xtensa_translate_zero_immed ("beqi", "beqz", popname, |
| 2567 | pnum_args, arg_strings)) |
| 2568 | return -1; |
| 2569 | |
| 2570 | if (xtensa_translate_zero_immed ("bgei", "bgez", popname, |
| 2571 | pnum_args, arg_strings)) |
| 2572 | return -1; |
| 2573 | |
| 2574 | if (xtensa_translate_zero_immed ("blti", "bltz", popname, |
| 2575 | pnum_args, arg_strings)) |
| 2576 | return -1; |
| 2577 | } |
| 2578 | |
| 2579 | return 0; |
| 2580 | } |
| 2581 | |
| 2582 | \f |
| 2583 | /* Functions for dealing with the Xtensa ISA. */ |
| 2584 | |
| 2585 | /* Currently the assembler only allows us to use a single target per |
| 2586 | fragment. Because of this, only one operand for a given |
| 2587 | instruction may be symbolic. If there is a PC-relative operand, |
| 2588 | the last one is chosen. Otherwise, the result is the number of the |
| 2589 | last immediate operand, and if there are none of those, we fail and |
| 2590 | return -1. */ |
| 2591 | |
| 2592 | static int |
| 2593 | get_relaxable_immed (xtensa_opcode opcode) |
| 2594 | { |
| 2595 | int last_immed = -1; |
| 2596 | int noperands, opi; |
| 2597 | |
| 2598 | if (opcode == XTENSA_UNDEFINED) |
| 2599 | return -1; |
| 2600 | |
| 2601 | noperands = xtensa_opcode_num_operands (xtensa_default_isa, opcode); |
| 2602 | for (opi = noperands - 1; opi >= 0; opi--) |
| 2603 | { |
| 2604 | if (xtensa_operand_is_visible (xtensa_default_isa, opcode, opi) == 0) |
| 2605 | continue; |
| 2606 | if (xtensa_operand_is_PCrelative (xtensa_default_isa, opcode, opi) == 1) |
| 2607 | return opi; |
| 2608 | if (last_immed == -1 |
| 2609 | && xtensa_operand_is_register (xtensa_default_isa, opcode, opi) == 0) |
| 2610 | last_immed = opi; |
| 2611 | } |
| 2612 | return last_immed; |
| 2613 | } |
| 2614 | |
| 2615 | |
| 2616 | static xtensa_opcode |
| 2617 | get_opcode_from_buf (const char *buf, int slot) |
| 2618 | { |
| 2619 | static xtensa_insnbuf insnbuf = NULL; |
| 2620 | static xtensa_insnbuf slotbuf = NULL; |
| 2621 | xtensa_isa isa = xtensa_default_isa; |
| 2622 | xtensa_format fmt; |
| 2623 | |
| 2624 | if (!insnbuf) |
| 2625 | { |
| 2626 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 2627 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 2628 | } |
| 2629 | |
| 2630 | xtensa_insnbuf_from_chars (isa, insnbuf, (const unsigned char *) buf, 0); |
| 2631 | fmt = xtensa_format_decode (isa, insnbuf); |
| 2632 | if (fmt == XTENSA_UNDEFINED) |
| 2633 | return XTENSA_UNDEFINED; |
| 2634 | |
| 2635 | if (slot >= xtensa_format_num_slots (isa, fmt)) |
| 2636 | return XTENSA_UNDEFINED; |
| 2637 | |
| 2638 | xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf); |
| 2639 | return xtensa_opcode_decode (isa, fmt, slot, slotbuf); |
| 2640 | } |
| 2641 | |
| 2642 | |
| 2643 | #ifdef TENSILICA_DEBUG |
| 2644 | |
| 2645 | /* For debugging, print out the mapping of opcode numbers to opcodes. */ |
| 2646 | |
| 2647 | static void |
| 2648 | xtensa_print_insn_table (void) |
| 2649 | { |
| 2650 | int num_opcodes, num_operands; |
| 2651 | xtensa_opcode opcode; |
| 2652 | xtensa_isa isa = xtensa_default_isa; |
| 2653 | |
| 2654 | num_opcodes = xtensa_isa_num_opcodes (xtensa_default_isa); |
| 2655 | for (opcode = 0; opcode < num_opcodes; opcode++) |
| 2656 | { |
| 2657 | int opn; |
| 2658 | fprintf (stderr, "%d: %s: ", opcode, xtensa_opcode_name (isa, opcode)); |
| 2659 | num_operands = xtensa_opcode_num_operands (isa, opcode); |
| 2660 | for (opn = 0; opn < num_operands; opn++) |
| 2661 | { |
| 2662 | if (xtensa_operand_is_visible (isa, opcode, opn) == 0) |
| 2663 | continue; |
| 2664 | if (xtensa_operand_is_register (isa, opcode, opn) == 1) |
| 2665 | { |
| 2666 | xtensa_regfile opnd_rf = |
| 2667 | xtensa_operand_regfile (isa, opcode, opn); |
| 2668 | fprintf (stderr, "%s ", xtensa_regfile_shortname (isa, opnd_rf)); |
| 2669 | } |
| 2670 | else if (xtensa_operand_is_PCrelative (isa, opcode, opn) == 1) |
| 2671 | fputs ("[lLr] ", stderr); |
| 2672 | else |
| 2673 | fputs ("i ", stderr); |
| 2674 | } |
| 2675 | fprintf (stderr, "\n"); |
| 2676 | } |
| 2677 | } |
| 2678 | |
| 2679 | |
| 2680 | static void |
| 2681 | print_vliw_insn (xtensa_insnbuf vbuf) |
| 2682 | { |
| 2683 | xtensa_isa isa = xtensa_default_isa; |
| 2684 | xtensa_format f = xtensa_format_decode (isa, vbuf); |
| 2685 | xtensa_insnbuf sbuf = xtensa_insnbuf_alloc (isa); |
| 2686 | int op; |
| 2687 | |
| 2688 | fprintf (stderr, "format = %d\n", f); |
| 2689 | |
| 2690 | for (op = 0; op < xtensa_format_num_slots (isa, f); op++) |
| 2691 | { |
| 2692 | xtensa_opcode opcode; |
| 2693 | const char *opname; |
| 2694 | int operands; |
| 2695 | |
| 2696 | xtensa_format_get_slot (isa, f, op, vbuf, sbuf); |
| 2697 | opcode = xtensa_opcode_decode (isa, f, op, sbuf); |
| 2698 | opname = xtensa_opcode_name (isa, opcode); |
| 2699 | |
| 2700 | fprintf (stderr, "op in slot %i is %s;\n", op, opname); |
| 2701 | fprintf (stderr, " operands = "); |
| 2702 | for (operands = 0; |
| 2703 | operands < xtensa_opcode_num_operands (isa, opcode); |
| 2704 | operands++) |
| 2705 | { |
| 2706 | unsigned int val; |
| 2707 | if (xtensa_operand_is_visible (isa, opcode, operands) == 0) |
| 2708 | continue; |
| 2709 | xtensa_operand_get_field (isa, opcode, operands, f, op, sbuf, &val); |
| 2710 | xtensa_operand_decode (isa, opcode, operands, &val); |
| 2711 | fprintf (stderr, "%d ", val); |
| 2712 | } |
| 2713 | fprintf (stderr, "\n"); |
| 2714 | } |
| 2715 | xtensa_insnbuf_free (isa, sbuf); |
| 2716 | } |
| 2717 | |
| 2718 | #endif /* TENSILICA_DEBUG */ |
| 2719 | |
| 2720 | |
| 2721 | static bfd_boolean |
| 2722 | is_direct_call_opcode (xtensa_opcode opcode) |
| 2723 | { |
| 2724 | xtensa_isa isa = xtensa_default_isa; |
| 2725 | int n, num_operands; |
| 2726 | |
| 2727 | if (xtensa_opcode_is_call (isa, opcode) != 1) |
| 2728 | return FALSE; |
| 2729 | |
| 2730 | num_operands = xtensa_opcode_num_operands (isa, opcode); |
| 2731 | for (n = 0; n < num_operands; n++) |
| 2732 | { |
| 2733 | if (xtensa_operand_is_register (isa, opcode, n) == 0 |
| 2734 | && xtensa_operand_is_PCrelative (isa, opcode, n) == 1) |
| 2735 | return TRUE; |
| 2736 | } |
| 2737 | return FALSE; |
| 2738 | } |
| 2739 | |
| 2740 | |
| 2741 | /* Convert from BFD relocation type code to slot and operand number. |
| 2742 | Returns non-zero on failure. */ |
| 2743 | |
| 2744 | static int |
| 2745 | decode_reloc (bfd_reloc_code_real_type reloc, int *slot, bfd_boolean *is_alt) |
| 2746 | { |
| 2747 | if (reloc >= BFD_RELOC_XTENSA_SLOT0_OP |
| 2748 | && reloc <= BFD_RELOC_XTENSA_SLOT14_OP) |
| 2749 | { |
| 2750 | *slot = reloc - BFD_RELOC_XTENSA_SLOT0_OP; |
| 2751 | *is_alt = FALSE; |
| 2752 | } |
| 2753 | else if (reloc >= BFD_RELOC_XTENSA_SLOT0_ALT |
| 2754 | && reloc <= BFD_RELOC_XTENSA_SLOT14_ALT) |
| 2755 | { |
| 2756 | *slot = reloc - BFD_RELOC_XTENSA_SLOT0_ALT; |
| 2757 | *is_alt = TRUE; |
| 2758 | } |
| 2759 | else |
| 2760 | return -1; |
| 2761 | |
| 2762 | return 0; |
| 2763 | } |
| 2764 | |
| 2765 | |
| 2766 | /* Convert from slot number to BFD relocation type code for the |
| 2767 | standard PC-relative relocations. Return BFD_RELOC_NONE on |
| 2768 | failure. */ |
| 2769 | |
| 2770 | static bfd_reloc_code_real_type |
| 2771 | encode_reloc (int slot) |
| 2772 | { |
| 2773 | if (slot < 0 || slot > 14) |
| 2774 | return BFD_RELOC_NONE; |
| 2775 | |
| 2776 | return BFD_RELOC_XTENSA_SLOT0_OP + slot; |
| 2777 | } |
| 2778 | |
| 2779 | |
| 2780 | /* Convert from slot numbers to BFD relocation type code for the |
| 2781 | "alternate" relocations. Return BFD_RELOC_NONE on failure. */ |
| 2782 | |
| 2783 | static bfd_reloc_code_real_type |
| 2784 | encode_alt_reloc (int slot) |
| 2785 | { |
| 2786 | if (slot < 0 || slot > 14) |
| 2787 | return BFD_RELOC_NONE; |
| 2788 | |
| 2789 | return BFD_RELOC_XTENSA_SLOT0_ALT + slot; |
| 2790 | } |
| 2791 | |
| 2792 | |
| 2793 | static void |
| 2794 | xtensa_insnbuf_set_operand (xtensa_insnbuf slotbuf, |
| 2795 | xtensa_format fmt, |
| 2796 | int slot, |
| 2797 | xtensa_opcode opcode, |
| 2798 | int operand, |
| 2799 | uint32 value, |
| 2800 | const char *file, |
| 2801 | unsigned int line) |
| 2802 | { |
| 2803 | uint32 valbuf = value; |
| 2804 | |
| 2805 | if (xtensa_operand_encode (xtensa_default_isa, opcode, operand, &valbuf)) |
| 2806 | { |
| 2807 | if (xtensa_operand_is_PCrelative (xtensa_default_isa, opcode, operand) |
| 2808 | == 1) |
| 2809 | as_bad_where ((char *) file, line, |
| 2810 | _("operand %d of '%s' has out of range value '%u'"), |
| 2811 | operand + 1, |
| 2812 | xtensa_opcode_name (xtensa_default_isa, opcode), |
| 2813 | value); |
| 2814 | else |
| 2815 | as_bad_where ((char *) file, line, |
| 2816 | _("operand %d of '%s' has invalid value '%u'"), |
| 2817 | operand + 1, |
| 2818 | xtensa_opcode_name (xtensa_default_isa, opcode), |
| 2819 | value); |
| 2820 | return; |
| 2821 | } |
| 2822 | |
| 2823 | xtensa_operand_set_field (xtensa_default_isa, opcode, operand, fmt, slot, |
| 2824 | slotbuf, valbuf); |
| 2825 | } |
| 2826 | |
| 2827 | |
| 2828 | static uint32 |
| 2829 | xtensa_insnbuf_get_operand (xtensa_insnbuf slotbuf, |
| 2830 | xtensa_format fmt, |
| 2831 | int slot, |
| 2832 | xtensa_opcode opcode, |
| 2833 | int opnum) |
| 2834 | { |
| 2835 | uint32 val = 0; |
| 2836 | (void) xtensa_operand_get_field (xtensa_default_isa, opcode, opnum, |
| 2837 | fmt, slot, slotbuf, &val); |
| 2838 | (void) xtensa_operand_decode (xtensa_default_isa, opcode, opnum, &val); |
| 2839 | return val; |
| 2840 | } |
| 2841 | |
| 2842 | \f |
| 2843 | /* Checks for rules from xtensa-relax tables. */ |
| 2844 | |
| 2845 | /* The routine xg_instruction_matches_option_term must return TRUE |
| 2846 | when a given option term is true. The meaning of all of the option |
| 2847 | terms is given interpretation by this function. */ |
| 2848 | |
| 2849 | static bfd_boolean |
| 2850 | xg_instruction_matches_option_term (TInsn *insn, const ReqOrOption *option) |
| 2851 | { |
| 2852 | if (strcmp (option->option_name, "realnop") == 0 |
| 2853 | || strncmp (option->option_name, "IsaUse", 6) == 0) |
| 2854 | { |
| 2855 | /* These conditions were evaluated statically when building the |
| 2856 | relaxation table. There's no need to reevaluate them now. */ |
| 2857 | return TRUE; |
| 2858 | } |
| 2859 | else if (strcmp (option->option_name, "FREEREG") == 0) |
| 2860 | return insn->extra_arg.X_op == O_register; |
| 2861 | else |
| 2862 | { |
| 2863 | as_fatal (_("internal error: unknown option name '%s'"), |
| 2864 | option->option_name); |
| 2865 | } |
| 2866 | } |
| 2867 | |
| 2868 | |
| 2869 | static bfd_boolean |
| 2870 | xg_instruction_matches_or_options (TInsn *insn, |
| 2871 | const ReqOrOptionList *or_option) |
| 2872 | { |
| 2873 | const ReqOrOption *option; |
| 2874 | /* Must match each of the AND terms. */ |
| 2875 | for (option = or_option; option != NULL; option = option->next) |
| 2876 | { |
| 2877 | if (xg_instruction_matches_option_term (insn, option)) |
| 2878 | return TRUE; |
| 2879 | } |
| 2880 | return FALSE; |
| 2881 | } |
| 2882 | |
| 2883 | |
| 2884 | static bfd_boolean |
| 2885 | xg_instruction_matches_options (TInsn *insn, const ReqOptionList *options) |
| 2886 | { |
| 2887 | const ReqOption *req_options; |
| 2888 | /* Must match each of the AND terms. */ |
| 2889 | for (req_options = options; |
| 2890 | req_options != NULL; |
| 2891 | req_options = req_options->next) |
| 2892 | { |
| 2893 | /* Must match one of the OR clauses. */ |
| 2894 | if (!xg_instruction_matches_or_options (insn, |
| 2895 | req_options->or_option_terms)) |
| 2896 | return FALSE; |
| 2897 | } |
| 2898 | return TRUE; |
| 2899 | } |
| 2900 | |
| 2901 | |
| 2902 | /* Return the transition rule that matches or NULL if none matches. */ |
| 2903 | |
| 2904 | static bfd_boolean |
| 2905 | xg_instruction_matches_rule (TInsn *insn, TransitionRule *rule) |
| 2906 | { |
| 2907 | PreconditionList *condition_l; |
| 2908 | |
| 2909 | if (rule->opcode != insn->opcode) |
| 2910 | return FALSE; |
| 2911 | |
| 2912 | for (condition_l = rule->conditions; |
| 2913 | condition_l != NULL; |
| 2914 | condition_l = condition_l->next) |
| 2915 | { |
| 2916 | expressionS *exp1; |
| 2917 | expressionS *exp2; |
| 2918 | Precondition *cond = condition_l->precond; |
| 2919 | |
| 2920 | switch (cond->typ) |
| 2921 | { |
| 2922 | case OP_CONSTANT: |
| 2923 | /* The expression must be the constant. */ |
| 2924 | gas_assert (cond->op_num < insn->ntok); |
| 2925 | exp1 = &insn->tok[cond->op_num]; |
| 2926 | if (expr_is_const (exp1)) |
| 2927 | { |
| 2928 | switch (cond->cmp) |
| 2929 | { |
| 2930 | case OP_EQUAL: |
| 2931 | if (get_expr_const (exp1) != cond->op_data) |
| 2932 | return FALSE; |
| 2933 | break; |
| 2934 | case OP_NOTEQUAL: |
| 2935 | if (get_expr_const (exp1) == cond->op_data) |
| 2936 | return FALSE; |
| 2937 | break; |
| 2938 | default: |
| 2939 | return FALSE; |
| 2940 | } |
| 2941 | } |
| 2942 | else if (expr_is_register (exp1)) |
| 2943 | { |
| 2944 | switch (cond->cmp) |
| 2945 | { |
| 2946 | case OP_EQUAL: |
| 2947 | if (get_expr_register (exp1) != cond->op_data) |
| 2948 | return FALSE; |
| 2949 | break; |
| 2950 | case OP_NOTEQUAL: |
| 2951 | if (get_expr_register (exp1) == cond->op_data) |
| 2952 | return FALSE; |
| 2953 | break; |
| 2954 | default: |
| 2955 | return FALSE; |
| 2956 | } |
| 2957 | } |
| 2958 | else |
| 2959 | return FALSE; |
| 2960 | break; |
| 2961 | |
| 2962 | case OP_OPERAND: |
| 2963 | gas_assert (cond->op_num < insn->ntok); |
| 2964 | gas_assert (cond->op_data < insn->ntok); |
| 2965 | exp1 = &insn->tok[cond->op_num]; |
| 2966 | exp2 = &insn->tok[cond->op_data]; |
| 2967 | |
| 2968 | switch (cond->cmp) |
| 2969 | { |
| 2970 | case OP_EQUAL: |
| 2971 | if (!expr_is_equal (exp1, exp2)) |
| 2972 | return FALSE; |
| 2973 | break; |
| 2974 | case OP_NOTEQUAL: |
| 2975 | if (expr_is_equal (exp1, exp2)) |
| 2976 | return FALSE; |
| 2977 | break; |
| 2978 | } |
| 2979 | break; |
| 2980 | |
| 2981 | case OP_LITERAL: |
| 2982 | case OP_LABEL: |
| 2983 | default: |
| 2984 | return FALSE; |
| 2985 | } |
| 2986 | } |
| 2987 | if (!xg_instruction_matches_options (insn, rule->options)) |
| 2988 | return FALSE; |
| 2989 | |
| 2990 | return TRUE; |
| 2991 | } |
| 2992 | |
| 2993 | |
| 2994 | static int |
| 2995 | transition_rule_cmp (const TransitionRule *a, const TransitionRule *b) |
| 2996 | { |
| 2997 | bfd_boolean a_greater = FALSE; |
| 2998 | bfd_boolean b_greater = FALSE; |
| 2999 | |
| 3000 | ReqOptionList *l_a = a->options; |
| 3001 | ReqOptionList *l_b = b->options; |
| 3002 | |
| 3003 | /* We only care if they both are the same except for |
| 3004 | a const16 vs. an l32r. */ |
| 3005 | |
| 3006 | while (l_a && l_b && ((l_a->next == NULL) == (l_b->next == NULL))) |
| 3007 | { |
| 3008 | ReqOrOptionList *l_or_a = l_a->or_option_terms; |
| 3009 | ReqOrOptionList *l_or_b = l_b->or_option_terms; |
| 3010 | while (l_or_a && l_or_b && ((l_a->next == NULL) == (l_b->next == NULL))) |
| 3011 | { |
| 3012 | if (l_or_a->is_true != l_or_b->is_true) |
| 3013 | return 0; |
| 3014 | if (strcmp (l_or_a->option_name, l_or_b->option_name) != 0) |
| 3015 | { |
| 3016 | /* This is the case we care about. */ |
| 3017 | if (strcmp (l_or_a->option_name, "IsaUseConst16") == 0 |
| 3018 | && strcmp (l_or_b->option_name, "IsaUseL32R") == 0) |
| 3019 | { |
| 3020 | if (prefer_const16) |
| 3021 | a_greater = TRUE; |
| 3022 | else |
| 3023 | b_greater = TRUE; |
| 3024 | } |
| 3025 | else if (strcmp (l_or_a->option_name, "IsaUseL32R") == 0 |
| 3026 | && strcmp (l_or_b->option_name, "IsaUseConst16") == 0) |
| 3027 | { |
| 3028 | if (prefer_const16) |
| 3029 | b_greater = TRUE; |
| 3030 | else |
| 3031 | a_greater = TRUE; |
| 3032 | } |
| 3033 | else |
| 3034 | return 0; |
| 3035 | } |
| 3036 | l_or_a = l_or_a->next; |
| 3037 | l_or_b = l_or_b->next; |
| 3038 | } |
| 3039 | if (l_or_a || l_or_b) |
| 3040 | return 0; |
| 3041 | |
| 3042 | l_a = l_a->next; |
| 3043 | l_b = l_b->next; |
| 3044 | } |
| 3045 | if (l_a || l_b) |
| 3046 | return 0; |
| 3047 | |
| 3048 | /* Incomparable if the substitution was used differently in two cases. */ |
| 3049 | if (a_greater && b_greater) |
| 3050 | return 0; |
| 3051 | |
| 3052 | if (b_greater) |
| 3053 | return 1; |
| 3054 | if (a_greater) |
| 3055 | return -1; |
| 3056 | |
| 3057 | return 0; |
| 3058 | } |
| 3059 | |
| 3060 | |
| 3061 | static TransitionRule * |
| 3062 | xg_instruction_match (TInsn *insn) |
| 3063 | { |
| 3064 | TransitionTable *table = xg_build_simplify_table (&transition_rule_cmp); |
| 3065 | TransitionList *l; |
| 3066 | gas_assert (insn->opcode < table->num_opcodes); |
| 3067 | |
| 3068 | /* Walk through all of the possible transitions. */ |
| 3069 | for (l = table->table[insn->opcode]; l != NULL; l = l->next) |
| 3070 | { |
| 3071 | TransitionRule *rule = l->rule; |
| 3072 | if (xg_instruction_matches_rule (insn, rule)) |
| 3073 | return rule; |
| 3074 | } |
| 3075 | return NULL; |
| 3076 | } |
| 3077 | |
| 3078 | \f |
| 3079 | /* Various Other Internal Functions. */ |
| 3080 | |
| 3081 | static bfd_boolean |
| 3082 | is_unique_insn_expansion (TransitionRule *r) |
| 3083 | { |
| 3084 | if (!r->to_instr || r->to_instr->next != NULL) |
| 3085 | return FALSE; |
| 3086 | if (r->to_instr->typ != INSTR_INSTR) |
| 3087 | return FALSE; |
| 3088 | return TRUE; |
| 3089 | } |
| 3090 | |
| 3091 | |
| 3092 | /* Check if there is exactly one relaxation for INSN that converts it to |
| 3093 | another instruction of equal or larger size. If so, and if TARG is |
| 3094 | non-null, go ahead and generate the relaxed instruction into TARG. If |
| 3095 | NARROW_ONLY is true, then only consider relaxations that widen a narrow |
| 3096 | instruction, i.e., ignore relaxations that convert to an instruction of |
| 3097 | equal size. In some contexts where this function is used, only |
| 3098 | a single widening is allowed and the NARROW_ONLY argument is used to |
| 3099 | exclude cases like ADDI being "widened" to an ADDMI, which may |
| 3100 | later be relaxed to an ADDMI/ADDI pair. */ |
| 3101 | |
| 3102 | bfd_boolean |
| 3103 | xg_is_single_relaxable_insn (TInsn *insn, TInsn *targ, bfd_boolean narrow_only) |
| 3104 | { |
| 3105 | TransitionTable *table = xg_build_widen_table (&transition_rule_cmp); |
| 3106 | TransitionList *l; |
| 3107 | TransitionRule *match = 0; |
| 3108 | |
| 3109 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 3110 | gas_assert (insn->opcode < table->num_opcodes); |
| 3111 | |
| 3112 | for (l = table->table[insn->opcode]; l != NULL; l = l->next) |
| 3113 | { |
| 3114 | TransitionRule *rule = l->rule; |
| 3115 | |
| 3116 | if (xg_instruction_matches_rule (insn, rule) |
| 3117 | && is_unique_insn_expansion (rule) |
| 3118 | && (xg_get_single_size (insn->opcode) + (narrow_only ? 1 : 0) |
| 3119 | <= xg_get_single_size (rule->to_instr->opcode))) |
| 3120 | { |
| 3121 | if (match) |
| 3122 | return FALSE; |
| 3123 | match = rule; |
| 3124 | } |
| 3125 | } |
| 3126 | if (!match) |
| 3127 | return FALSE; |
| 3128 | |
| 3129 | if (targ) |
| 3130 | xg_build_to_insn (targ, insn, match->to_instr); |
| 3131 | return TRUE; |
| 3132 | } |
| 3133 | |
| 3134 | |
| 3135 | /* Return the maximum number of bytes this opcode can expand to. */ |
| 3136 | |
| 3137 | static int |
| 3138 | xg_get_max_insn_widen_size (xtensa_opcode opcode) |
| 3139 | { |
| 3140 | TransitionTable *table = xg_build_widen_table (&transition_rule_cmp); |
| 3141 | TransitionList *l; |
| 3142 | int max_size = xg_get_single_size (opcode); |
| 3143 | |
| 3144 | gas_assert (opcode < table->num_opcodes); |
| 3145 | |
| 3146 | for (l = table->table[opcode]; l != NULL; l = l->next) |
| 3147 | { |
| 3148 | TransitionRule *rule = l->rule; |
| 3149 | BuildInstr *build_list; |
| 3150 | int this_size = 0; |
| 3151 | |
| 3152 | if (!rule) |
| 3153 | continue; |
| 3154 | build_list = rule->to_instr; |
| 3155 | if (is_unique_insn_expansion (rule)) |
| 3156 | { |
| 3157 | gas_assert (build_list->typ == INSTR_INSTR); |
| 3158 | this_size = xg_get_max_insn_widen_size (build_list->opcode); |
| 3159 | } |
| 3160 | else |
| 3161 | for (; build_list != NULL; build_list = build_list->next) |
| 3162 | { |
| 3163 | switch (build_list->typ) |
| 3164 | { |
| 3165 | case INSTR_INSTR: |
| 3166 | this_size += xg_get_single_size (build_list->opcode); |
| 3167 | break; |
| 3168 | case INSTR_LITERAL_DEF: |
| 3169 | case INSTR_LABEL_DEF: |
| 3170 | default: |
| 3171 | break; |
| 3172 | } |
| 3173 | } |
| 3174 | if (this_size > max_size) |
| 3175 | max_size = this_size; |
| 3176 | } |
| 3177 | return max_size; |
| 3178 | } |
| 3179 | |
| 3180 | |
| 3181 | /* Return the maximum number of literal bytes this opcode can generate. */ |
| 3182 | |
| 3183 | static int |
| 3184 | xg_get_max_insn_widen_literal_size (xtensa_opcode opcode) |
| 3185 | { |
| 3186 | TransitionTable *table = xg_build_widen_table (&transition_rule_cmp); |
| 3187 | TransitionList *l; |
| 3188 | int max_size = 0; |
| 3189 | |
| 3190 | gas_assert (opcode < table->num_opcodes); |
| 3191 | |
| 3192 | for (l = table->table[opcode]; l != NULL; l = l->next) |
| 3193 | { |
| 3194 | TransitionRule *rule = l->rule; |
| 3195 | BuildInstr *build_list; |
| 3196 | int this_size = 0; |
| 3197 | |
| 3198 | if (!rule) |
| 3199 | continue; |
| 3200 | build_list = rule->to_instr; |
| 3201 | if (is_unique_insn_expansion (rule)) |
| 3202 | { |
| 3203 | gas_assert (build_list->typ == INSTR_INSTR); |
| 3204 | this_size = xg_get_max_insn_widen_literal_size (build_list->opcode); |
| 3205 | } |
| 3206 | else |
| 3207 | for (; build_list != NULL; build_list = build_list->next) |
| 3208 | { |
| 3209 | switch (build_list->typ) |
| 3210 | { |
| 3211 | case INSTR_LITERAL_DEF: |
| 3212 | /* Hard-coded 4-byte literal. */ |
| 3213 | this_size += 4; |
| 3214 | break; |
| 3215 | case INSTR_INSTR: |
| 3216 | case INSTR_LABEL_DEF: |
| 3217 | default: |
| 3218 | break; |
| 3219 | } |
| 3220 | } |
| 3221 | if (this_size > max_size) |
| 3222 | max_size = this_size; |
| 3223 | } |
| 3224 | return max_size; |
| 3225 | } |
| 3226 | |
| 3227 | |
| 3228 | static bfd_boolean |
| 3229 | xg_is_relaxable_insn (TInsn *insn, int lateral_steps) |
| 3230 | { |
| 3231 | int steps_taken = 0; |
| 3232 | TransitionTable *table = xg_build_widen_table (&transition_rule_cmp); |
| 3233 | TransitionList *l; |
| 3234 | |
| 3235 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 3236 | gas_assert (insn->opcode < table->num_opcodes); |
| 3237 | |
| 3238 | for (l = table->table[insn->opcode]; l != NULL; l = l->next) |
| 3239 | { |
| 3240 | TransitionRule *rule = l->rule; |
| 3241 | |
| 3242 | if (xg_instruction_matches_rule (insn, rule)) |
| 3243 | { |
| 3244 | if (steps_taken == lateral_steps) |
| 3245 | return TRUE; |
| 3246 | steps_taken++; |
| 3247 | } |
| 3248 | } |
| 3249 | return FALSE; |
| 3250 | } |
| 3251 | |
| 3252 | |
| 3253 | static symbolS * |
| 3254 | get_special_literal_symbol (void) |
| 3255 | { |
| 3256 | static symbolS *sym = NULL; |
| 3257 | |
| 3258 | if (sym == NULL) |
| 3259 | sym = symbol_find_or_make ("SPECIAL_LITERAL0\001"); |
| 3260 | return sym; |
| 3261 | } |
| 3262 | |
| 3263 | |
| 3264 | static symbolS * |
| 3265 | get_special_label_symbol (void) |
| 3266 | { |
| 3267 | static symbolS *sym = NULL; |
| 3268 | |
| 3269 | if (sym == NULL) |
| 3270 | sym = symbol_find_or_make ("SPECIAL_LABEL0\001"); |
| 3271 | return sym; |
| 3272 | } |
| 3273 | |
| 3274 | |
| 3275 | static bfd_boolean |
| 3276 | xg_valid_literal_expression (const expressionS *exp) |
| 3277 | { |
| 3278 | switch (exp->X_op) |
| 3279 | { |
| 3280 | case O_constant: |
| 3281 | case O_symbol: |
| 3282 | case O_big: |
| 3283 | case O_uminus: |
| 3284 | case O_subtract: |
| 3285 | case O_pltrel: |
| 3286 | case O_pcrel: |
| 3287 | case O_tlsfunc: |
| 3288 | case O_tlsarg: |
| 3289 | case O_tpoff: |
| 3290 | case O_dtpoff: |
| 3291 | return TRUE; |
| 3292 | default: |
| 3293 | return FALSE; |
| 3294 | } |
| 3295 | } |
| 3296 | |
| 3297 | |
| 3298 | /* This will check to see if the value can be converted into the |
| 3299 | operand type. It will return TRUE if it does not fit. */ |
| 3300 | |
| 3301 | static bfd_boolean |
| 3302 | xg_check_operand (int32 value, xtensa_opcode opcode, int operand) |
| 3303 | { |
| 3304 | uint32 valbuf = value; |
| 3305 | if (xtensa_operand_encode (xtensa_default_isa, opcode, operand, &valbuf)) |
| 3306 | return TRUE; |
| 3307 | return FALSE; |
| 3308 | } |
| 3309 | |
| 3310 | |
| 3311 | /* Assumes: All immeds are constants. Check that all constants fit |
| 3312 | into their immeds; return FALSE if not. */ |
| 3313 | |
| 3314 | static bfd_boolean |
| 3315 | xg_immeds_fit (const TInsn *insn) |
| 3316 | { |
| 3317 | xtensa_isa isa = xtensa_default_isa; |
| 3318 | int i; |
| 3319 | |
| 3320 | int n = insn->ntok; |
| 3321 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 3322 | for (i = 0; i < n; ++i) |
| 3323 | { |
| 3324 | const expressionS *exp = &insn->tok[i]; |
| 3325 | |
| 3326 | if (xtensa_operand_is_register (isa, insn->opcode, i) == 1) |
| 3327 | continue; |
| 3328 | |
| 3329 | switch (exp->X_op) |
| 3330 | { |
| 3331 | case O_register: |
| 3332 | case O_constant: |
| 3333 | if (xg_check_operand (exp->X_add_number, insn->opcode, i)) |
| 3334 | return FALSE; |
| 3335 | break; |
| 3336 | |
| 3337 | default: |
| 3338 | /* The symbol should have a fixup associated with it. */ |
| 3339 | gas_assert (FALSE); |
| 3340 | break; |
| 3341 | } |
| 3342 | } |
| 3343 | return TRUE; |
| 3344 | } |
| 3345 | |
| 3346 | |
| 3347 | /* This should only be called after we have an initial |
| 3348 | estimate of the addresses. */ |
| 3349 | |
| 3350 | static bfd_boolean |
| 3351 | xg_symbolic_immeds_fit (const TInsn *insn, |
| 3352 | segT pc_seg, |
| 3353 | fragS *pc_frag, |
| 3354 | offsetT pc_offset, |
| 3355 | long stretch) |
| 3356 | { |
| 3357 | xtensa_isa isa = xtensa_default_isa; |
| 3358 | symbolS *symbolP; |
| 3359 | fragS *sym_frag; |
| 3360 | offsetT target, pc; |
| 3361 | uint32 new_offset; |
| 3362 | int i; |
| 3363 | int n = insn->ntok; |
| 3364 | |
| 3365 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 3366 | |
| 3367 | for (i = 0; i < n; ++i) |
| 3368 | { |
| 3369 | const expressionS *exp = &insn->tok[i]; |
| 3370 | |
| 3371 | if (xtensa_operand_is_register (isa, insn->opcode, i) == 1) |
| 3372 | continue; |
| 3373 | |
| 3374 | switch (exp->X_op) |
| 3375 | { |
| 3376 | case O_register: |
| 3377 | case O_constant: |
| 3378 | if (xg_check_operand (exp->X_add_number, insn->opcode, i)) |
| 3379 | return FALSE; |
| 3380 | break; |
| 3381 | |
| 3382 | case O_lo16: |
| 3383 | case O_hi16: |
| 3384 | /* Check for the worst case. */ |
| 3385 | if (xg_check_operand (0xffff, insn->opcode, i)) |
| 3386 | return FALSE; |
| 3387 | break; |
| 3388 | |
| 3389 | case O_symbol: |
| 3390 | /* We only allow symbols for PC-relative references. |
| 3391 | If pc_frag == 0, then we don't have frag locations yet. */ |
| 3392 | if (pc_frag == 0 |
| 3393 | || xtensa_operand_is_PCrelative (isa, insn->opcode, i) == 0) |
| 3394 | return FALSE; |
| 3395 | |
| 3396 | /* If it is a weak symbol or a symbol in a different section, |
| 3397 | it cannot be known to fit at assembly time. */ |
| 3398 | if (S_IS_WEAK (exp->X_add_symbol) |
| 3399 | || S_GET_SEGMENT (exp->X_add_symbol) != pc_seg) |
| 3400 | { |
| 3401 | /* For a direct call with --no-longcalls, be optimistic and |
| 3402 | assume it will be in range. If the symbol is weak and |
| 3403 | undefined, it may remain undefined at link-time, in which |
| 3404 | case it will have a zero value and almost certainly be out |
| 3405 | of range for a direct call; thus, relax for undefined weak |
| 3406 | symbols even if longcalls is not enabled. */ |
| 3407 | if (is_direct_call_opcode (insn->opcode) |
| 3408 | && ! pc_frag->tc_frag_data.use_longcalls |
| 3409 | && (! S_IS_WEAK (exp->X_add_symbol) |
| 3410 | || S_IS_DEFINED (exp->X_add_symbol))) |
| 3411 | return TRUE; |
| 3412 | |
| 3413 | return FALSE; |
| 3414 | } |
| 3415 | |
| 3416 | symbolP = exp->X_add_symbol; |
| 3417 | sym_frag = symbol_get_frag (symbolP); |
| 3418 | target = S_GET_VALUE (symbolP) + exp->X_add_number; |
| 3419 | pc = pc_frag->fr_address + pc_offset; |
| 3420 | |
| 3421 | /* If frag has yet to be reached on this pass, assume it |
| 3422 | will move by STRETCH just as we did. If this is not so, |
| 3423 | it will be because some frag between grows, and that will |
| 3424 | force another pass. Beware zero-length frags. There |
| 3425 | should be a faster way to do this. */ |
| 3426 | |
| 3427 | if (stretch != 0 |
| 3428 | && sym_frag->relax_marker != pc_frag->relax_marker |
| 3429 | && S_GET_SEGMENT (symbolP) == pc_seg) |
| 3430 | { |
| 3431 | target += stretch; |
| 3432 | } |
| 3433 | |
| 3434 | new_offset = target; |
| 3435 | xtensa_operand_do_reloc (isa, insn->opcode, i, &new_offset, pc); |
| 3436 | if (xg_check_operand (new_offset, insn->opcode, i)) |
| 3437 | return FALSE; |
| 3438 | break; |
| 3439 | |
| 3440 | default: |
| 3441 | /* The symbol should have a fixup associated with it. */ |
| 3442 | return FALSE; |
| 3443 | } |
| 3444 | } |
| 3445 | |
| 3446 | return TRUE; |
| 3447 | } |
| 3448 | |
| 3449 | |
| 3450 | /* Return TRUE on success. */ |
| 3451 | |
| 3452 | static bfd_boolean |
| 3453 | xg_build_to_insn (TInsn *targ, TInsn *insn, BuildInstr *bi) |
| 3454 | { |
| 3455 | BuildOp *op; |
| 3456 | symbolS *sym; |
| 3457 | |
| 3458 | tinsn_init (targ); |
| 3459 | targ->debug_line = insn->debug_line; |
| 3460 | targ->loc_directive_seen = insn->loc_directive_seen; |
| 3461 | switch (bi->typ) |
| 3462 | { |
| 3463 | case INSTR_INSTR: |
| 3464 | op = bi->ops; |
| 3465 | targ->opcode = bi->opcode; |
| 3466 | targ->insn_type = ITYPE_INSN; |
| 3467 | targ->is_specific_opcode = FALSE; |
| 3468 | |
| 3469 | for (; op != NULL; op = op->next) |
| 3470 | { |
| 3471 | int op_num = op->op_num; |
| 3472 | int op_data = op->op_data; |
| 3473 | |
| 3474 | gas_assert (op->op_num < MAX_INSN_ARGS); |
| 3475 | |
| 3476 | if (targ->ntok <= op_num) |
| 3477 | targ->ntok = op_num + 1; |
| 3478 | |
| 3479 | switch (op->typ) |
| 3480 | { |
| 3481 | case OP_CONSTANT: |
| 3482 | set_expr_const (&targ->tok[op_num], op_data); |
| 3483 | break; |
| 3484 | case OP_OPERAND: |
| 3485 | gas_assert (op_data < insn->ntok); |
| 3486 | copy_expr (&targ->tok[op_num], &insn->tok[op_data]); |
| 3487 | break; |
| 3488 | case OP_FREEREG: |
| 3489 | if (insn->extra_arg.X_op != O_register) |
| 3490 | return FALSE; |
| 3491 | copy_expr (&targ->tok[op_num], &insn->extra_arg); |
| 3492 | break; |
| 3493 | case OP_LITERAL: |
| 3494 | sym = get_special_literal_symbol (); |
| 3495 | set_expr_symbol_offset (&targ->tok[op_num], sym, 0); |
| 3496 | if (insn->tok[op_data].X_op == O_tlsfunc |
| 3497 | || insn->tok[op_data].X_op == O_tlsarg) |
| 3498 | copy_expr (&targ->extra_arg, &insn->tok[op_data]); |
| 3499 | break; |
| 3500 | case OP_LABEL: |
| 3501 | sym = get_special_label_symbol (); |
| 3502 | set_expr_symbol_offset (&targ->tok[op_num], sym, 0); |
| 3503 | break; |
| 3504 | case OP_OPERAND_HI16U: |
| 3505 | case OP_OPERAND_LOW16U: |
| 3506 | gas_assert (op_data < insn->ntok); |
| 3507 | if (expr_is_const (&insn->tok[op_data])) |
| 3508 | { |
| 3509 | long val; |
| 3510 | copy_expr (&targ->tok[op_num], &insn->tok[op_data]); |
| 3511 | val = xg_apply_userdef_op_fn (op->typ, |
| 3512 | targ->tok[op_num]. |
| 3513 | X_add_number); |
| 3514 | targ->tok[op_num].X_add_number = val; |
| 3515 | } |
| 3516 | else |
| 3517 | { |
| 3518 | /* For const16 we can create relocations for these. */ |
| 3519 | if (targ->opcode == XTENSA_UNDEFINED |
| 3520 | || (targ->opcode != xtensa_const16_opcode)) |
| 3521 | return FALSE; |
| 3522 | gas_assert (op_data < insn->ntok); |
| 3523 | /* Need to build a O_lo16 or O_hi16. */ |
| 3524 | copy_expr (&targ->tok[op_num], &insn->tok[op_data]); |
| 3525 | if (targ->tok[op_num].X_op == O_symbol) |
| 3526 | { |
| 3527 | if (op->typ == OP_OPERAND_HI16U) |
| 3528 | targ->tok[op_num].X_op = O_hi16; |
| 3529 | else if (op->typ == OP_OPERAND_LOW16U) |
| 3530 | targ->tok[op_num].X_op = O_lo16; |
| 3531 | else |
| 3532 | return FALSE; |
| 3533 | } |
| 3534 | } |
| 3535 | break; |
| 3536 | default: |
| 3537 | /* currently handles: |
| 3538 | OP_OPERAND_LOW8 |
| 3539 | OP_OPERAND_HI24S |
| 3540 | OP_OPERAND_F32MINUS */ |
| 3541 | if (xg_has_userdef_op_fn (op->typ)) |
| 3542 | { |
| 3543 | gas_assert (op_data < insn->ntok); |
| 3544 | if (expr_is_const (&insn->tok[op_data])) |
| 3545 | { |
| 3546 | long val; |
| 3547 | copy_expr (&targ->tok[op_num], &insn->tok[op_data]); |
| 3548 | val = xg_apply_userdef_op_fn (op->typ, |
| 3549 | targ->tok[op_num]. |
| 3550 | X_add_number); |
| 3551 | targ->tok[op_num].X_add_number = val; |
| 3552 | } |
| 3553 | else |
| 3554 | return FALSE; /* We cannot use a relocation for this. */ |
| 3555 | break; |
| 3556 | } |
| 3557 | gas_assert (0); |
| 3558 | break; |
| 3559 | } |
| 3560 | } |
| 3561 | break; |
| 3562 | |
| 3563 | case INSTR_LITERAL_DEF: |
| 3564 | op = bi->ops; |
| 3565 | targ->opcode = XTENSA_UNDEFINED; |
| 3566 | targ->insn_type = ITYPE_LITERAL; |
| 3567 | targ->is_specific_opcode = FALSE; |
| 3568 | for (; op != NULL; op = op->next) |
| 3569 | { |
| 3570 | int op_num = op->op_num; |
| 3571 | int op_data = op->op_data; |
| 3572 | gas_assert (op->op_num < MAX_INSN_ARGS); |
| 3573 | |
| 3574 | if (targ->ntok <= op_num) |
| 3575 | targ->ntok = op_num + 1; |
| 3576 | |
| 3577 | switch (op->typ) |
| 3578 | { |
| 3579 | case OP_OPERAND: |
| 3580 | gas_assert (op_data < insn->ntok); |
| 3581 | /* We can only pass resolvable literals through. */ |
| 3582 | if (!xg_valid_literal_expression (&insn->tok[op_data])) |
| 3583 | return FALSE; |
| 3584 | copy_expr (&targ->tok[op_num], &insn->tok[op_data]); |
| 3585 | break; |
| 3586 | case OP_LITERAL: |
| 3587 | case OP_CONSTANT: |
| 3588 | case OP_LABEL: |
| 3589 | default: |
| 3590 | gas_assert (0); |
| 3591 | break; |
| 3592 | } |
| 3593 | } |
| 3594 | break; |
| 3595 | |
| 3596 | case INSTR_LABEL_DEF: |
| 3597 | op = bi->ops; |
| 3598 | targ->opcode = XTENSA_UNDEFINED; |
| 3599 | targ->insn_type = ITYPE_LABEL; |
| 3600 | targ->is_specific_opcode = FALSE; |
| 3601 | /* Literal with no ops is a label? */ |
| 3602 | gas_assert (op == NULL); |
| 3603 | break; |
| 3604 | |
| 3605 | default: |
| 3606 | gas_assert (0); |
| 3607 | } |
| 3608 | |
| 3609 | return TRUE; |
| 3610 | } |
| 3611 | |
| 3612 | |
| 3613 | /* Return TRUE on success. */ |
| 3614 | |
| 3615 | static bfd_boolean |
| 3616 | xg_build_to_stack (IStack *istack, TInsn *insn, BuildInstr *bi) |
| 3617 | { |
| 3618 | for (; bi != NULL; bi = bi->next) |
| 3619 | { |
| 3620 | TInsn *next_insn = istack_push_space (istack); |
| 3621 | |
| 3622 | if (!xg_build_to_insn (next_insn, insn, bi)) |
| 3623 | return FALSE; |
| 3624 | } |
| 3625 | return TRUE; |
| 3626 | } |
| 3627 | |
| 3628 | |
| 3629 | /* Return TRUE on valid expansion. */ |
| 3630 | |
| 3631 | static bfd_boolean |
| 3632 | xg_expand_to_stack (IStack *istack, TInsn *insn, int lateral_steps) |
| 3633 | { |
| 3634 | int stack_size = istack->ninsn; |
| 3635 | int steps_taken = 0; |
| 3636 | TransitionTable *table = xg_build_widen_table (&transition_rule_cmp); |
| 3637 | TransitionList *l; |
| 3638 | |
| 3639 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 3640 | gas_assert (insn->opcode < table->num_opcodes); |
| 3641 | |
| 3642 | for (l = table->table[insn->opcode]; l != NULL; l = l->next) |
| 3643 | { |
| 3644 | TransitionRule *rule = l->rule; |
| 3645 | |
| 3646 | if (xg_instruction_matches_rule (insn, rule)) |
| 3647 | { |
| 3648 | if (lateral_steps == steps_taken) |
| 3649 | { |
| 3650 | int i; |
| 3651 | |
| 3652 | /* This is it. Expand the rule to the stack. */ |
| 3653 | if (!xg_build_to_stack (istack, insn, rule->to_instr)) |
| 3654 | return FALSE; |
| 3655 | |
| 3656 | /* Check to see if it fits. */ |
| 3657 | for (i = stack_size; i < istack->ninsn; i++) |
| 3658 | { |
| 3659 | TInsn *tinsn = &istack->insn[i]; |
| 3660 | |
| 3661 | if (tinsn->insn_type == ITYPE_INSN |
| 3662 | && !tinsn_has_symbolic_operands (tinsn) |
| 3663 | && !xg_immeds_fit (tinsn)) |
| 3664 | { |
| 3665 | istack->ninsn = stack_size; |
| 3666 | return FALSE; |
| 3667 | } |
| 3668 | } |
| 3669 | return TRUE; |
| 3670 | } |
| 3671 | steps_taken++; |
| 3672 | } |
| 3673 | } |
| 3674 | return FALSE; |
| 3675 | } |
| 3676 | |
| 3677 | \f |
| 3678 | /* Relax the assembly instruction at least "min_steps". |
| 3679 | Return the number of steps taken. |
| 3680 | |
| 3681 | For relaxation to correctly terminate, every relaxation chain must |
| 3682 | terminate in one of two ways: |
| 3683 | |
| 3684 | 1. If the chain from one instruction to the next consists entirely of |
| 3685 | single instructions, then the chain *must* handle all possible |
| 3686 | immediates without failing. It must not ever fail because an |
| 3687 | immediate is out of range. The MOVI.N -> MOVI -> L32R relaxation |
| 3688 | chain is one example. L32R loads 32 bits, and there cannot be an |
| 3689 | immediate larger than 32 bits, so it satisfies this condition. |
| 3690 | Single instruction relaxation chains are as defined by |
| 3691 | xg_is_single_relaxable_instruction. |
| 3692 | |
| 3693 | 2. Otherwise, the chain must end in a multi-instruction expansion: e.g., |
| 3694 | BNEZ.N -> BNEZ -> BNEZ.W15 -> BENZ.N/J |
| 3695 | |
| 3696 | Strictly speaking, in most cases you can violate condition 1 and be OK |
| 3697 | -- in particular when the last two instructions have the same single |
| 3698 | size. But nevertheless, you should guarantee the above two conditions. |
| 3699 | |
| 3700 | We could fix this so that single-instruction expansions correctly |
| 3701 | terminate when they can't handle the range, but the error messages are |
| 3702 | worse, and it actually turns out that in every case but one (18-bit wide |
| 3703 | branches), you need a multi-instruction expansion to get the full range |
| 3704 | anyway. And because 18-bit branches are handled identically to 15-bit |
| 3705 | branches, there isn't any point in changing it. */ |
| 3706 | |
| 3707 | static int |
| 3708 | xg_assembly_relax (IStack *istack, |
| 3709 | TInsn *insn, |
| 3710 | segT pc_seg, |
| 3711 | fragS *pc_frag, /* if pc_frag == 0, not pc-relative */ |
| 3712 | offsetT pc_offset, /* offset in fragment */ |
| 3713 | int min_steps, /* minimum conversion steps */ |
| 3714 | long stretch) /* number of bytes stretched so far */ |
| 3715 | { |
| 3716 | int steps_taken = 0; |
| 3717 | |
| 3718 | /* Some of its immeds don't fit. Try to build a relaxed version. |
| 3719 | This may go through a couple of stages of single instruction |
| 3720 | transformations before we get there. */ |
| 3721 | |
| 3722 | TInsn single_target; |
| 3723 | TInsn current_insn; |
| 3724 | int lateral_steps = 0; |
| 3725 | int istack_size = istack->ninsn; |
| 3726 | |
| 3727 | if (xg_symbolic_immeds_fit (insn, pc_seg, pc_frag, pc_offset, stretch) |
| 3728 | && steps_taken >= min_steps) |
| 3729 | { |
| 3730 | istack_push (istack, insn); |
| 3731 | return steps_taken; |
| 3732 | } |
| 3733 | current_insn = *insn; |
| 3734 | |
| 3735 | /* Walk through all of the single instruction expansions. */ |
| 3736 | while (xg_is_single_relaxable_insn (¤t_insn, &single_target, FALSE)) |
| 3737 | { |
| 3738 | steps_taken++; |
| 3739 | if (xg_symbolic_immeds_fit (&single_target, pc_seg, pc_frag, pc_offset, |
| 3740 | stretch)) |
| 3741 | { |
| 3742 | if (steps_taken >= min_steps) |
| 3743 | { |
| 3744 | istack_push (istack, &single_target); |
| 3745 | return steps_taken; |
| 3746 | } |
| 3747 | } |
| 3748 | current_insn = single_target; |
| 3749 | } |
| 3750 | |
| 3751 | /* Now check for a multi-instruction expansion. */ |
| 3752 | while (xg_is_relaxable_insn (¤t_insn, lateral_steps)) |
| 3753 | { |
| 3754 | if (xg_symbolic_immeds_fit (¤t_insn, pc_seg, pc_frag, pc_offset, |
| 3755 | stretch)) |
| 3756 | { |
| 3757 | if (steps_taken >= min_steps) |
| 3758 | { |
| 3759 | istack_push (istack, ¤t_insn); |
| 3760 | return steps_taken; |
| 3761 | } |
| 3762 | } |
| 3763 | steps_taken++; |
| 3764 | if (xg_expand_to_stack (istack, ¤t_insn, lateral_steps)) |
| 3765 | { |
| 3766 | if (steps_taken >= min_steps) |
| 3767 | return steps_taken; |
| 3768 | } |
| 3769 | lateral_steps++; |
| 3770 | istack->ninsn = istack_size; |
| 3771 | } |
| 3772 | |
| 3773 | /* It's not going to work -- use the original. */ |
| 3774 | istack_push (istack, insn); |
| 3775 | return steps_taken; |
| 3776 | } |
| 3777 | |
| 3778 | |
| 3779 | static void |
| 3780 | xg_finish_frag (char *last_insn, |
| 3781 | enum xtensa_relax_statesE frag_state, |
| 3782 | enum xtensa_relax_statesE slot0_state, |
| 3783 | int max_growth, |
| 3784 | bfd_boolean is_insn) |
| 3785 | { |
| 3786 | /* Finish off this fragment so that it has at LEAST the desired |
| 3787 | max_growth. If it doesn't fit in this fragment, close this one |
| 3788 | and start a new one. In either case, return a pointer to the |
| 3789 | beginning of the growth area. */ |
| 3790 | |
| 3791 | fragS *old_frag; |
| 3792 | |
| 3793 | frag_grow (max_growth); |
| 3794 | old_frag = frag_now; |
| 3795 | |
| 3796 | frag_now->fr_opcode = last_insn; |
| 3797 | if (is_insn) |
| 3798 | frag_now->tc_frag_data.is_insn = TRUE; |
| 3799 | |
| 3800 | frag_var (rs_machine_dependent, max_growth, max_growth, |
| 3801 | frag_state, frag_now->fr_symbol, frag_now->fr_offset, last_insn); |
| 3802 | |
| 3803 | old_frag->tc_frag_data.slot_subtypes[0] = slot0_state; |
| 3804 | xtensa_set_frag_assembly_state (frag_now); |
| 3805 | |
| 3806 | /* Just to make sure that we did not split it up. */ |
| 3807 | gas_assert (old_frag->fr_next == frag_now); |
| 3808 | } |
| 3809 | |
| 3810 | |
| 3811 | /* Return TRUE if the target frag is one of the next non-empty frags. */ |
| 3812 | |
| 3813 | static bfd_boolean |
| 3814 | is_next_frag_target (const fragS *fragP, const fragS *target) |
| 3815 | { |
| 3816 | if (fragP == NULL) |
| 3817 | return FALSE; |
| 3818 | |
| 3819 | for (; fragP; fragP = fragP->fr_next) |
| 3820 | { |
| 3821 | if (fragP == target) |
| 3822 | return TRUE; |
| 3823 | if (fragP->fr_fix != 0) |
| 3824 | return FALSE; |
| 3825 | if (fragP->fr_type == rs_fill && fragP->fr_offset != 0) |
| 3826 | return FALSE; |
| 3827 | if ((fragP->fr_type == rs_align || fragP->fr_type == rs_align_code) |
| 3828 | && ((fragP->fr_address % (1 << fragP->fr_offset)) != 0)) |
| 3829 | return FALSE; |
| 3830 | if (fragP->fr_type == rs_space) |
| 3831 | return FALSE; |
| 3832 | } |
| 3833 | return FALSE; |
| 3834 | } |
| 3835 | |
| 3836 | |
| 3837 | static bfd_boolean |
| 3838 | is_branch_jmp_to_next (TInsn *insn, fragS *fragP) |
| 3839 | { |
| 3840 | xtensa_isa isa = xtensa_default_isa; |
| 3841 | int i; |
| 3842 | int num_ops = xtensa_opcode_num_operands (isa, insn->opcode); |
| 3843 | int target_op = -1; |
| 3844 | symbolS *sym; |
| 3845 | fragS *target_frag; |
| 3846 | |
| 3847 | if (xtensa_opcode_is_branch (isa, insn->opcode) != 1 |
| 3848 | && xtensa_opcode_is_jump (isa, insn->opcode) != 1) |
| 3849 | return FALSE; |
| 3850 | |
| 3851 | for (i = 0; i < num_ops; i++) |
| 3852 | { |
| 3853 | if (xtensa_operand_is_PCrelative (isa, insn->opcode, i) == 1) |
| 3854 | { |
| 3855 | target_op = i; |
| 3856 | break; |
| 3857 | } |
| 3858 | } |
| 3859 | if (target_op == -1) |
| 3860 | return FALSE; |
| 3861 | |
| 3862 | if (insn->ntok <= target_op) |
| 3863 | return FALSE; |
| 3864 | |
| 3865 | if (insn->tok[target_op].X_op != O_symbol) |
| 3866 | return FALSE; |
| 3867 | |
| 3868 | sym = insn->tok[target_op].X_add_symbol; |
| 3869 | if (sym == NULL) |
| 3870 | return FALSE; |
| 3871 | |
| 3872 | if (insn->tok[target_op].X_add_number != 0) |
| 3873 | return FALSE; |
| 3874 | |
| 3875 | target_frag = symbol_get_frag (sym); |
| 3876 | if (target_frag == NULL) |
| 3877 | return FALSE; |
| 3878 | |
| 3879 | if (is_next_frag_target (fragP->fr_next, target_frag) |
| 3880 | && S_GET_VALUE (sym) == target_frag->fr_address) |
| 3881 | return TRUE; |
| 3882 | |
| 3883 | return FALSE; |
| 3884 | } |
| 3885 | |
| 3886 | |
| 3887 | static void |
| 3888 | xg_add_branch_and_loop_targets (TInsn *insn) |
| 3889 | { |
| 3890 | xtensa_isa isa = xtensa_default_isa; |
| 3891 | int num_ops = xtensa_opcode_num_operands (isa, insn->opcode); |
| 3892 | |
| 3893 | if (xtensa_opcode_is_loop (isa, insn->opcode) == 1) |
| 3894 | { |
| 3895 | int i = 1; |
| 3896 | if (xtensa_operand_is_PCrelative (isa, insn->opcode, i) == 1 |
| 3897 | && insn->tok[i].X_op == O_symbol) |
| 3898 | symbol_get_tc (insn->tok[i].X_add_symbol)->is_loop_target = TRUE; |
| 3899 | return; |
| 3900 | } |
| 3901 | |
| 3902 | if (xtensa_opcode_is_branch (isa, insn->opcode) == 1 |
| 3903 | || xtensa_opcode_is_loop (isa, insn->opcode) == 1) |
| 3904 | { |
| 3905 | int i; |
| 3906 | |
| 3907 | for (i = 0; i < insn->ntok && i < num_ops; i++) |
| 3908 | { |
| 3909 | if (xtensa_operand_is_PCrelative (isa, insn->opcode, i) == 1 |
| 3910 | && insn->tok[i].X_op == O_symbol) |
| 3911 | { |
| 3912 | symbolS *sym = insn->tok[i].X_add_symbol; |
| 3913 | symbol_get_tc (sym)->is_branch_target = TRUE; |
| 3914 | if (S_IS_DEFINED (sym)) |
| 3915 | symbol_get_frag (sym)->tc_frag_data.is_branch_target = TRUE; |
| 3916 | } |
| 3917 | } |
| 3918 | } |
| 3919 | } |
| 3920 | |
| 3921 | |
| 3922 | /* Return FALSE if no error. */ |
| 3923 | |
| 3924 | static bfd_boolean |
| 3925 | xg_build_token_insn (BuildInstr *instr_spec, TInsn *old_insn, TInsn *new_insn) |
| 3926 | { |
| 3927 | int num_ops = 0; |
| 3928 | BuildOp *b_op; |
| 3929 | |
| 3930 | switch (instr_spec->typ) |
| 3931 | { |
| 3932 | case INSTR_INSTR: |
| 3933 | new_insn->insn_type = ITYPE_INSN; |
| 3934 | new_insn->opcode = instr_spec->opcode; |
| 3935 | break; |
| 3936 | case INSTR_LITERAL_DEF: |
| 3937 | new_insn->insn_type = ITYPE_LITERAL; |
| 3938 | new_insn->opcode = XTENSA_UNDEFINED; |
| 3939 | break; |
| 3940 | case INSTR_LABEL_DEF: |
| 3941 | abort (); |
| 3942 | } |
| 3943 | new_insn->is_specific_opcode = FALSE; |
| 3944 | new_insn->debug_line = old_insn->debug_line; |
| 3945 | new_insn->loc_directive_seen = old_insn->loc_directive_seen; |
| 3946 | |
| 3947 | for (b_op = instr_spec->ops; b_op != NULL; b_op = b_op->next) |
| 3948 | { |
| 3949 | expressionS *exp; |
| 3950 | const expressionS *src_exp; |
| 3951 | |
| 3952 | num_ops++; |
| 3953 | switch (b_op->typ) |
| 3954 | { |
| 3955 | case OP_CONSTANT: |
| 3956 | /* The expression must be the constant. */ |
| 3957 | gas_assert (b_op->op_num < MAX_INSN_ARGS); |
| 3958 | exp = &new_insn->tok[b_op->op_num]; |
| 3959 | set_expr_const (exp, b_op->op_data); |
| 3960 | break; |
| 3961 | |
| 3962 | case OP_OPERAND: |
| 3963 | gas_assert (b_op->op_num < MAX_INSN_ARGS); |
| 3964 | gas_assert (b_op->op_data < (unsigned) old_insn->ntok); |
| 3965 | src_exp = &old_insn->tok[b_op->op_data]; |
| 3966 | exp = &new_insn->tok[b_op->op_num]; |
| 3967 | copy_expr (exp, src_exp); |
| 3968 | break; |
| 3969 | |
| 3970 | case OP_LITERAL: |
| 3971 | case OP_LABEL: |
| 3972 | as_bad (_("can't handle generation of literal/labels yet")); |
| 3973 | gas_assert (0); |
| 3974 | |
| 3975 | default: |
| 3976 | as_bad (_("can't handle undefined OP TYPE")); |
| 3977 | gas_assert (0); |
| 3978 | } |
| 3979 | } |
| 3980 | |
| 3981 | new_insn->ntok = num_ops; |
| 3982 | return FALSE; |
| 3983 | } |
| 3984 | |
| 3985 | |
| 3986 | /* Return TRUE if it was simplified. */ |
| 3987 | |
| 3988 | static bfd_boolean |
| 3989 | xg_simplify_insn (TInsn *old_insn, TInsn *new_insn) |
| 3990 | { |
| 3991 | TransitionRule *rule; |
| 3992 | BuildInstr *insn_spec; |
| 3993 | |
| 3994 | if (old_insn->is_specific_opcode || !density_supported) |
| 3995 | return FALSE; |
| 3996 | |
| 3997 | rule = xg_instruction_match (old_insn); |
| 3998 | if (rule == NULL) |
| 3999 | return FALSE; |
| 4000 | |
| 4001 | insn_spec = rule->to_instr; |
| 4002 | /* There should only be one. */ |
| 4003 | gas_assert (insn_spec != NULL); |
| 4004 | gas_assert (insn_spec->next == NULL); |
| 4005 | if (insn_spec->next != NULL) |
| 4006 | return FALSE; |
| 4007 | |
| 4008 | xg_build_token_insn (insn_spec, old_insn, new_insn); |
| 4009 | |
| 4010 | return TRUE; |
| 4011 | } |
| 4012 | |
| 4013 | |
| 4014 | /* xg_expand_assembly_insn: (1) Simplify the instruction, i.e., l32i -> |
| 4015 | l32i.n. (2) Check the number of operands. (3) Place the instruction |
| 4016 | tokens into the stack or relax it and place multiple |
| 4017 | instructions/literals onto the stack. Return FALSE if no error. */ |
| 4018 | |
| 4019 | static bfd_boolean |
| 4020 | xg_expand_assembly_insn (IStack *istack, TInsn *orig_insn) |
| 4021 | { |
| 4022 | int noperands; |
| 4023 | TInsn new_insn; |
| 4024 | bfd_boolean do_expand; |
| 4025 | |
| 4026 | tinsn_init (&new_insn); |
| 4027 | |
| 4028 | /* Narrow it if we can. xg_simplify_insn now does all the |
| 4029 | appropriate checking (e.g., for the density option). */ |
| 4030 | if (xg_simplify_insn (orig_insn, &new_insn)) |
| 4031 | orig_insn = &new_insn; |
| 4032 | |
| 4033 | noperands = xtensa_opcode_num_operands (xtensa_default_isa, |
| 4034 | orig_insn->opcode); |
| 4035 | if (orig_insn->ntok < noperands) |
| 4036 | { |
| 4037 | as_bad (_("found %d operands for '%s': Expected %d"), |
| 4038 | orig_insn->ntok, |
| 4039 | xtensa_opcode_name (xtensa_default_isa, orig_insn->opcode), |
| 4040 | noperands); |
| 4041 | return TRUE; |
| 4042 | } |
| 4043 | if (orig_insn->ntok > noperands) |
| 4044 | as_warn (_("found too many (%d) operands for '%s': Expected %d"), |
| 4045 | orig_insn->ntok, |
| 4046 | xtensa_opcode_name (xtensa_default_isa, orig_insn->opcode), |
| 4047 | noperands); |
| 4048 | |
| 4049 | /* If there are not enough operands, we will assert above. If there |
| 4050 | are too many, just cut out the extras here. */ |
| 4051 | orig_insn->ntok = noperands; |
| 4052 | |
| 4053 | if (tinsn_has_invalid_symbolic_operands (orig_insn)) |
| 4054 | return TRUE; |
| 4055 | |
| 4056 | /* Special case for extui opcode which has constraints not handled |
| 4057 | by the ordinary operand encoding checks. The number of operands |
| 4058 | and related syntax issues have already been checked. */ |
| 4059 | if (orig_insn->opcode == xtensa_extui_opcode) |
| 4060 | { |
| 4061 | int shiftimm = orig_insn->tok[2].X_add_number; |
| 4062 | int maskimm = orig_insn->tok[3].X_add_number; |
| 4063 | if (shiftimm + maskimm > 32) |
| 4064 | { |
| 4065 | as_bad (_("immediate operands sum to greater than 32")); |
| 4066 | return TRUE; |
| 4067 | } |
| 4068 | } |
| 4069 | |
| 4070 | /* If the instruction will definitely need to be relaxed, it is better |
| 4071 | to expand it now for better scheduling. Decide whether to expand |
| 4072 | now.... */ |
| 4073 | do_expand = (!orig_insn->is_specific_opcode && use_transform ()); |
| 4074 | |
| 4075 | /* Calls should be expanded to longcalls only in the backend relaxation |
| 4076 | so that the assembly scheduler will keep the L32R/CALLX instructions |
| 4077 | adjacent. */ |
| 4078 | if (is_direct_call_opcode (orig_insn->opcode)) |
| 4079 | do_expand = FALSE; |
| 4080 | |
| 4081 | if (tinsn_has_symbolic_operands (orig_insn)) |
| 4082 | { |
| 4083 | /* The values of symbolic operands are not known yet, so only expand |
| 4084 | now if an operand is "complex" (e.g., difference of symbols) and |
| 4085 | will have to be stored as a literal regardless of the value. */ |
| 4086 | if (!tinsn_has_complex_operands (orig_insn)) |
| 4087 | do_expand = FALSE; |
| 4088 | } |
| 4089 | else if (xg_immeds_fit (orig_insn)) |
| 4090 | do_expand = FALSE; |
| 4091 | |
| 4092 | if (do_expand) |
| 4093 | xg_assembly_relax (istack, orig_insn, 0, 0, 0, 0, 0); |
| 4094 | else |
| 4095 | istack_push (istack, orig_insn); |
| 4096 | |
| 4097 | return FALSE; |
| 4098 | } |
| 4099 | |
| 4100 | |
| 4101 | /* Return TRUE if the section flags are marked linkonce |
| 4102 | or the name is .gnu.linkonce.*. */ |
| 4103 | |
| 4104 | static int linkonce_len = sizeof (".gnu.linkonce.") - 1; |
| 4105 | |
| 4106 | static bfd_boolean |
| 4107 | get_is_linkonce_section (bfd *abfd ATTRIBUTE_UNUSED, segT sec) |
| 4108 | { |
| 4109 | flagword flags, link_once_flags; |
| 4110 | |
| 4111 | flags = bfd_get_section_flags (abfd, sec); |
| 4112 | link_once_flags = (flags & SEC_LINK_ONCE); |
| 4113 | |
| 4114 | /* Flags might not be set yet. */ |
| 4115 | if (!link_once_flags |
| 4116 | && strncmp (segment_name (sec), ".gnu.linkonce.", linkonce_len) == 0) |
| 4117 | link_once_flags = SEC_LINK_ONCE; |
| 4118 | |
| 4119 | return (link_once_flags != 0); |
| 4120 | } |
| 4121 | |
| 4122 | |
| 4123 | static void |
| 4124 | xtensa_add_literal_sym (symbolS *sym) |
| 4125 | { |
| 4126 | sym_list *l; |
| 4127 | |
| 4128 | l = (sym_list *) xmalloc (sizeof (sym_list)); |
| 4129 | l->sym = sym; |
| 4130 | l->next = literal_syms; |
| 4131 | literal_syms = l; |
| 4132 | } |
| 4133 | |
| 4134 | |
| 4135 | static symbolS * |
| 4136 | xtensa_create_literal_symbol (segT sec, fragS *frag) |
| 4137 | { |
| 4138 | static int lit_num = 0; |
| 4139 | static char name[256]; |
| 4140 | symbolS *symbolP; |
| 4141 | |
| 4142 | sprintf (name, ".L_lit_sym%d", lit_num); |
| 4143 | |
| 4144 | /* Create a local symbol. If it is in a linkonce section, we have to |
| 4145 | be careful to make sure that if it is used in a relocation that the |
| 4146 | symbol will be in the output file. */ |
| 4147 | if (get_is_linkonce_section (stdoutput, sec)) |
| 4148 | { |
| 4149 | symbolP = symbol_new (name, sec, 0, frag); |
| 4150 | S_CLEAR_EXTERNAL (symbolP); |
| 4151 | /* symbolP->local = 1; */ |
| 4152 | } |
| 4153 | else |
| 4154 | symbolP = symbol_new (name, sec, 0, frag); |
| 4155 | |
| 4156 | xtensa_add_literal_sym (symbolP); |
| 4157 | |
| 4158 | lit_num++; |
| 4159 | return symbolP; |
| 4160 | } |
| 4161 | |
| 4162 | |
| 4163 | /* Currently all literals that are generated here are 32-bit L32R targets. */ |
| 4164 | |
| 4165 | static symbolS * |
| 4166 | xg_assemble_literal (/* const */ TInsn *insn) |
| 4167 | { |
| 4168 | emit_state state; |
| 4169 | symbolS *lit_sym = NULL; |
| 4170 | bfd_reloc_code_real_type reloc; |
| 4171 | bfd_boolean pcrel = FALSE; |
| 4172 | char *p; |
| 4173 | |
| 4174 | /* size = 4 for L32R. It could easily be larger when we move to |
| 4175 | larger constants. Add a parameter later. */ |
| 4176 | offsetT litsize = 4; |
| 4177 | offsetT litalign = 2; /* 2^2 = 4 */ |
| 4178 | expressionS saved_loc; |
| 4179 | expressionS * emit_val; |
| 4180 | |
| 4181 | set_expr_symbol_offset (&saved_loc, frag_now->fr_symbol, frag_now_fix ()); |
| 4182 | |
| 4183 | gas_assert (insn->insn_type == ITYPE_LITERAL); |
| 4184 | gas_assert (insn->ntok == 1); /* must be only one token here */ |
| 4185 | |
| 4186 | xtensa_switch_to_literal_fragment (&state); |
| 4187 | |
| 4188 | emit_val = &insn->tok[0]; |
| 4189 | if (emit_val->X_op == O_big) |
| 4190 | { |
| 4191 | int size = emit_val->X_add_number * CHARS_PER_LITTLENUM; |
| 4192 | if (size > litsize) |
| 4193 | { |
| 4194 | /* This happens when someone writes a "movi a2, big_number". */ |
| 4195 | as_bad_where (frag_now->fr_file, frag_now->fr_line, |
| 4196 | _("invalid immediate")); |
| 4197 | xtensa_restore_emit_state (&state); |
| 4198 | return NULL; |
| 4199 | } |
| 4200 | } |
| 4201 | |
| 4202 | /* Force a 4-byte align here. Note that this opens a new frag, so all |
| 4203 | literals done with this function have a frag to themselves. That's |
| 4204 | important for the way text section literals work. */ |
| 4205 | frag_align (litalign, 0, 0); |
| 4206 | record_alignment (now_seg, litalign); |
| 4207 | |
| 4208 | switch (emit_val->X_op) |
| 4209 | { |
| 4210 | case O_pcrel: |
| 4211 | pcrel = TRUE; |
| 4212 | /* fall through */ |
| 4213 | case O_pltrel: |
| 4214 | case O_tlsfunc: |
| 4215 | case O_tlsarg: |
| 4216 | case O_tpoff: |
| 4217 | case O_dtpoff: |
| 4218 | p = frag_more (litsize); |
| 4219 | xtensa_set_frag_assembly_state (frag_now); |
| 4220 | reloc = map_operator_to_reloc (emit_val->X_op, TRUE); |
| 4221 | if (emit_val->X_add_symbol) |
| 4222 | emit_val->X_op = O_symbol; |
| 4223 | else |
| 4224 | emit_val->X_op = O_constant; |
| 4225 | fix_new_exp (frag_now, p - frag_now->fr_literal, |
| 4226 | litsize, emit_val, pcrel, reloc); |
| 4227 | break; |
| 4228 | |
| 4229 | default: |
| 4230 | emit_expr (emit_val, litsize); |
| 4231 | break; |
| 4232 | } |
| 4233 | |
| 4234 | gas_assert (frag_now->tc_frag_data.literal_frag == NULL); |
| 4235 | frag_now->tc_frag_data.literal_frag = get_literal_pool_location (now_seg); |
| 4236 | frag_now->fr_symbol = xtensa_create_literal_symbol (now_seg, frag_now); |
| 4237 | lit_sym = frag_now->fr_symbol; |
| 4238 | |
| 4239 | /* Go back. */ |
| 4240 | xtensa_restore_emit_state (&state); |
| 4241 | return lit_sym; |
| 4242 | } |
| 4243 | |
| 4244 | |
| 4245 | static void |
| 4246 | xg_assemble_literal_space (/* const */ int size, int slot) |
| 4247 | { |
| 4248 | emit_state state; |
| 4249 | /* We might have to do something about this alignment. It only |
| 4250 | takes effect if something is placed here. */ |
| 4251 | offsetT litalign = 2; /* 2^2 = 4 */ |
| 4252 | fragS *lit_saved_frag; |
| 4253 | |
| 4254 | gas_assert (size % 4 == 0); |
| 4255 | |
| 4256 | xtensa_switch_to_literal_fragment (&state); |
| 4257 | |
| 4258 | /* Force a 4-byte align here. */ |
| 4259 | frag_align (litalign, 0, 0); |
| 4260 | record_alignment (now_seg, litalign); |
| 4261 | |
| 4262 | frag_grow (size); |
| 4263 | |
| 4264 | lit_saved_frag = frag_now; |
| 4265 | frag_now->tc_frag_data.literal_frag = get_literal_pool_location (now_seg); |
| 4266 | frag_now->fr_symbol = xtensa_create_literal_symbol (now_seg, frag_now); |
| 4267 | xg_finish_frag (0, RELAX_LITERAL, 0, size, FALSE); |
| 4268 | |
| 4269 | /* Go back. */ |
| 4270 | xtensa_restore_emit_state (&state); |
| 4271 | frag_now->tc_frag_data.literal_frags[slot] = lit_saved_frag; |
| 4272 | } |
| 4273 | |
| 4274 | |
| 4275 | /* Put in a fixup record based on the opcode. |
| 4276 | Return TRUE on success. */ |
| 4277 | |
| 4278 | static bfd_boolean |
| 4279 | xg_add_opcode_fix (TInsn *tinsn, |
| 4280 | int opnum, |
| 4281 | xtensa_format fmt, |
| 4282 | int slot, |
| 4283 | expressionS *exp, |
| 4284 | fragS *fragP, |
| 4285 | offsetT offset) |
| 4286 | { |
| 4287 | xtensa_opcode opcode = tinsn->opcode; |
| 4288 | bfd_reloc_code_real_type reloc; |
| 4289 | reloc_howto_type *howto; |
| 4290 | int fmt_length; |
| 4291 | fixS *the_fix; |
| 4292 | |
| 4293 | reloc = BFD_RELOC_NONE; |
| 4294 | |
| 4295 | /* First try the special cases for "alternate" relocs. */ |
| 4296 | if (opcode == xtensa_l32r_opcode) |
| 4297 | { |
| 4298 | if (fragP->tc_frag_data.use_absolute_literals) |
| 4299 | reloc = encode_alt_reloc (slot); |
| 4300 | } |
| 4301 | else if (opcode == xtensa_const16_opcode) |
| 4302 | { |
| 4303 | if (exp->X_op == O_lo16) |
| 4304 | { |
| 4305 | reloc = encode_reloc (slot); |
| 4306 | exp->X_op = O_symbol; |
| 4307 | } |
| 4308 | else if (exp->X_op == O_hi16) |
| 4309 | { |
| 4310 | reloc = encode_alt_reloc (slot); |
| 4311 | exp->X_op = O_symbol; |
| 4312 | } |
| 4313 | } |
| 4314 | |
| 4315 | if (opnum != get_relaxable_immed (opcode)) |
| 4316 | { |
| 4317 | as_bad (_("invalid relocation for operand %i of '%s'"), |
| 4318 | opnum + 1, xtensa_opcode_name (xtensa_default_isa, opcode)); |
| 4319 | return FALSE; |
| 4320 | } |
| 4321 | |
| 4322 | /* Handle erroneous "@h" and "@l" expressions here before they propagate |
| 4323 | into the symbol table where the generic portions of the assembler |
| 4324 | won't know what to do with them. */ |
| 4325 | if (exp->X_op == O_lo16 || exp->X_op == O_hi16) |
| 4326 | { |
| 4327 | as_bad (_("invalid expression for operand %i of '%s'"), |
| 4328 | opnum + 1, xtensa_opcode_name (xtensa_default_isa, opcode)); |
| 4329 | return FALSE; |
| 4330 | } |
| 4331 | |
| 4332 | /* Next try the generic relocs. */ |
| 4333 | if (reloc == BFD_RELOC_NONE) |
| 4334 | reloc = encode_reloc (slot); |
| 4335 | if (reloc == BFD_RELOC_NONE) |
| 4336 | { |
| 4337 | as_bad (_("invalid relocation in instruction slot %i"), slot); |
| 4338 | return FALSE; |
| 4339 | } |
| 4340 | |
| 4341 | howto = bfd_reloc_type_lookup (stdoutput, reloc); |
| 4342 | if (!howto) |
| 4343 | { |
| 4344 | as_bad (_("undefined symbol for opcode \"%s\""), |
| 4345 | xtensa_opcode_name (xtensa_default_isa, opcode)); |
| 4346 | return FALSE; |
| 4347 | } |
| 4348 | |
| 4349 | fmt_length = xtensa_format_length (xtensa_default_isa, fmt); |
| 4350 | the_fix = fix_new_exp (fragP, offset, fmt_length, exp, |
| 4351 | howto->pc_relative, reloc); |
| 4352 | the_fix->fx_no_overflow = 1; |
| 4353 | the_fix->tc_fix_data.X_add_symbol = exp->X_add_symbol; |
| 4354 | the_fix->tc_fix_data.X_add_number = exp->X_add_number; |
| 4355 | the_fix->tc_fix_data.slot = slot; |
| 4356 | |
| 4357 | return TRUE; |
| 4358 | } |
| 4359 | |
| 4360 | |
| 4361 | static bfd_boolean |
| 4362 | xg_emit_insn_to_buf (TInsn *tinsn, |
| 4363 | char *buf, |
| 4364 | fragS *fragP, |
| 4365 | offsetT offset, |
| 4366 | bfd_boolean build_fix) |
| 4367 | { |
| 4368 | static xtensa_insnbuf insnbuf = NULL; |
| 4369 | bfd_boolean has_symbolic_immed = FALSE; |
| 4370 | bfd_boolean ok = TRUE; |
| 4371 | |
| 4372 | if (!insnbuf) |
| 4373 | insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa); |
| 4374 | |
| 4375 | has_symbolic_immed = tinsn_to_insnbuf (tinsn, insnbuf); |
| 4376 | if (has_symbolic_immed && build_fix) |
| 4377 | { |
| 4378 | /* Add a fixup. */ |
| 4379 | xtensa_format fmt = xg_get_single_format (tinsn->opcode); |
| 4380 | int slot = xg_get_single_slot (tinsn->opcode); |
| 4381 | int opnum = get_relaxable_immed (tinsn->opcode); |
| 4382 | expressionS *exp = &tinsn->tok[opnum]; |
| 4383 | |
| 4384 | if (!xg_add_opcode_fix (tinsn, opnum, fmt, slot, exp, fragP, offset)) |
| 4385 | ok = FALSE; |
| 4386 | } |
| 4387 | fragP->tc_frag_data.is_insn = TRUE; |
| 4388 | xtensa_insnbuf_to_chars (xtensa_default_isa, insnbuf, |
| 4389 | (unsigned char *) buf, 0); |
| 4390 | return ok; |
| 4391 | } |
| 4392 | |
| 4393 | |
| 4394 | static void |
| 4395 | xg_resolve_literals (TInsn *insn, symbolS *lit_sym) |
| 4396 | { |
| 4397 | symbolS *sym = get_special_literal_symbol (); |
| 4398 | int i; |
| 4399 | if (lit_sym == 0) |
| 4400 | return; |
| 4401 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 4402 | for (i = 0; i < insn->ntok; i++) |
| 4403 | if (insn->tok[i].X_add_symbol == sym) |
| 4404 | insn->tok[i].X_add_symbol = lit_sym; |
| 4405 | |
| 4406 | } |
| 4407 | |
| 4408 | |
| 4409 | static void |
| 4410 | xg_resolve_labels (TInsn *insn, symbolS *label_sym) |
| 4411 | { |
| 4412 | symbolS *sym = get_special_label_symbol (); |
| 4413 | int i; |
| 4414 | for (i = 0; i < insn->ntok; i++) |
| 4415 | if (insn->tok[i].X_add_symbol == sym) |
| 4416 | insn->tok[i].X_add_symbol = label_sym; |
| 4417 | |
| 4418 | } |
| 4419 | |
| 4420 | |
| 4421 | /* Return TRUE if the instruction can write to the specified |
| 4422 | integer register. */ |
| 4423 | |
| 4424 | static bfd_boolean |
| 4425 | is_register_writer (const TInsn *insn, const char *regset, int regnum) |
| 4426 | { |
| 4427 | int i; |
| 4428 | int num_ops; |
| 4429 | xtensa_isa isa = xtensa_default_isa; |
| 4430 | |
| 4431 | num_ops = xtensa_opcode_num_operands (isa, insn->opcode); |
| 4432 | |
| 4433 | for (i = 0; i < num_ops; i++) |
| 4434 | { |
| 4435 | char inout; |
| 4436 | inout = xtensa_operand_inout (isa, insn->opcode, i); |
| 4437 | if ((inout == 'o' || inout == 'm') |
| 4438 | && xtensa_operand_is_register (isa, insn->opcode, i) == 1) |
| 4439 | { |
| 4440 | xtensa_regfile opnd_rf = |
| 4441 | xtensa_operand_regfile (isa, insn->opcode, i); |
| 4442 | if (!strcmp (xtensa_regfile_shortname (isa, opnd_rf), regset)) |
| 4443 | { |
| 4444 | if ((insn->tok[i].X_op == O_register) |
| 4445 | && (insn->tok[i].X_add_number == regnum)) |
| 4446 | return TRUE; |
| 4447 | } |
| 4448 | } |
| 4449 | } |
| 4450 | return FALSE; |
| 4451 | } |
| 4452 | |
| 4453 | |
| 4454 | static bfd_boolean |
| 4455 | is_bad_loopend_opcode (const TInsn *tinsn) |
| 4456 | { |
| 4457 | xtensa_opcode opcode = tinsn->opcode; |
| 4458 | |
| 4459 | if (opcode == XTENSA_UNDEFINED) |
| 4460 | return FALSE; |
| 4461 | |
| 4462 | if (opcode == xtensa_call0_opcode |
| 4463 | || opcode == xtensa_callx0_opcode |
| 4464 | || opcode == xtensa_call4_opcode |
| 4465 | || opcode == xtensa_callx4_opcode |
| 4466 | || opcode == xtensa_call8_opcode |
| 4467 | || opcode == xtensa_callx8_opcode |
| 4468 | || opcode == xtensa_call12_opcode |
| 4469 | || opcode == xtensa_callx12_opcode |
| 4470 | || opcode == xtensa_isync_opcode |
| 4471 | || opcode == xtensa_ret_opcode |
| 4472 | || opcode == xtensa_ret_n_opcode |
| 4473 | || opcode == xtensa_retw_opcode |
| 4474 | || opcode == xtensa_retw_n_opcode |
| 4475 | || opcode == xtensa_waiti_opcode |
| 4476 | || opcode == xtensa_rsr_lcount_opcode) |
| 4477 | return TRUE; |
| 4478 | |
| 4479 | return FALSE; |
| 4480 | } |
| 4481 | |
| 4482 | |
| 4483 | /* Labels that begin with ".Ln" or ".LM" are unaligned. |
| 4484 | This allows the debugger to add unaligned labels. |
| 4485 | Also, the assembler generates stabs labels that need |
| 4486 | not be aligned: FAKE_LABEL_NAME . {"F", "L", "endfunc"}. */ |
| 4487 | |
| 4488 | static bfd_boolean |
| 4489 | is_unaligned_label (symbolS *sym) |
| 4490 | { |
| 4491 | const char *name = S_GET_NAME (sym); |
| 4492 | static size_t fake_size = 0; |
| 4493 | |
| 4494 | if (name |
| 4495 | && name[0] == '.' |
| 4496 | && name[1] == 'L' && (name[2] == 'n' || name[2] == 'M')) |
| 4497 | return TRUE; |
| 4498 | |
| 4499 | /* FAKE_LABEL_NAME followed by "F", "L" or "endfunc" */ |
| 4500 | if (fake_size == 0) |
| 4501 | fake_size = strlen (FAKE_LABEL_NAME); |
| 4502 | |
| 4503 | if (name |
| 4504 | && strncmp (FAKE_LABEL_NAME, name, fake_size) == 0 |
| 4505 | && (name[fake_size] == 'F' |
| 4506 | || name[fake_size] == 'L' |
| 4507 | || (name[fake_size] == 'e' |
| 4508 | && strncmp ("endfunc", name+fake_size, 7) == 0))) |
| 4509 | return TRUE; |
| 4510 | |
| 4511 | return FALSE; |
| 4512 | } |
| 4513 | |
| 4514 | |
| 4515 | static fragS * |
| 4516 | next_non_empty_frag (const fragS *fragP) |
| 4517 | { |
| 4518 | fragS *next_fragP = fragP->fr_next; |
| 4519 | |
| 4520 | /* Sometimes an empty will end up here due storage allocation issues. |
| 4521 | So we have to skip until we find something legit. */ |
| 4522 | while (next_fragP && next_fragP->fr_fix == 0) |
| 4523 | next_fragP = next_fragP->fr_next; |
| 4524 | |
| 4525 | if (next_fragP == NULL || next_fragP->fr_fix == 0) |
| 4526 | return NULL; |
| 4527 | |
| 4528 | return next_fragP; |
| 4529 | } |
| 4530 | |
| 4531 | |
| 4532 | static bfd_boolean |
| 4533 | next_frag_opcode_is_loop (const fragS *fragP, xtensa_opcode *opcode) |
| 4534 | { |
| 4535 | xtensa_opcode out_opcode; |
| 4536 | const fragS *next_fragP = next_non_empty_frag (fragP); |
| 4537 | |
| 4538 | if (next_fragP == NULL) |
| 4539 | return FALSE; |
| 4540 | |
| 4541 | out_opcode = get_opcode_from_buf (next_fragP->fr_literal, 0); |
| 4542 | if (xtensa_opcode_is_loop (xtensa_default_isa, out_opcode) == 1) |
| 4543 | { |
| 4544 | *opcode = out_opcode; |
| 4545 | return TRUE; |
| 4546 | } |
| 4547 | return FALSE; |
| 4548 | } |
| 4549 | |
| 4550 | |
| 4551 | static int |
| 4552 | frag_format_size (const fragS *fragP) |
| 4553 | { |
| 4554 | static xtensa_insnbuf insnbuf = NULL; |
| 4555 | xtensa_isa isa = xtensa_default_isa; |
| 4556 | xtensa_format fmt; |
| 4557 | int fmt_size; |
| 4558 | |
| 4559 | if (!insnbuf) |
| 4560 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 4561 | |
| 4562 | if (fragP == NULL) |
| 4563 | return XTENSA_UNDEFINED; |
| 4564 | |
| 4565 | xtensa_insnbuf_from_chars (isa, insnbuf, |
| 4566 | (unsigned char *) fragP->fr_literal, 0); |
| 4567 | |
| 4568 | fmt = xtensa_format_decode (isa, insnbuf); |
| 4569 | if (fmt == XTENSA_UNDEFINED) |
| 4570 | return XTENSA_UNDEFINED; |
| 4571 | fmt_size = xtensa_format_length (isa, fmt); |
| 4572 | |
| 4573 | /* If the next format won't be changing due to relaxation, just |
| 4574 | return the length of the first format. */ |
| 4575 | if (fragP->fr_opcode != fragP->fr_literal) |
| 4576 | return fmt_size; |
| 4577 | |
| 4578 | /* If during relaxation we have to pull an instruction out of a |
| 4579 | multi-slot instruction, we will return the more conservative |
| 4580 | number. This works because alignment on bigger instructions |
| 4581 | is more restrictive than alignment on smaller instructions. |
| 4582 | This is more conservative than we would like, but it happens |
| 4583 | infrequently. */ |
| 4584 | |
| 4585 | if (xtensa_format_num_slots (xtensa_default_isa, fmt) > 1) |
| 4586 | return fmt_size; |
| 4587 | |
| 4588 | /* If we aren't doing one of our own relaxations or it isn't |
| 4589 | slot-based, then the insn size won't change. */ |
| 4590 | if (fragP->fr_type != rs_machine_dependent) |
| 4591 | return fmt_size; |
| 4592 | if (fragP->fr_subtype != RELAX_SLOTS) |
| 4593 | return fmt_size; |
| 4594 | |
| 4595 | /* If an instruction is about to grow, return the longer size. */ |
| 4596 | if (fragP->tc_frag_data.slot_subtypes[0] == RELAX_IMMED_STEP1 |
| 4597 | || fragP->tc_frag_data.slot_subtypes[0] == RELAX_IMMED_STEP2 |
| 4598 | || fragP->tc_frag_data.slot_subtypes[0] == RELAX_IMMED_STEP3) |
| 4599 | { |
| 4600 | /* For most frags at RELAX_IMMED_STEPX, with X > 0, the first |
| 4601 | instruction in the relaxed version is of length 3. (The case |
| 4602 | where we have to pull the instruction out of a FLIX bundle |
| 4603 | is handled conservatively above.) However, frags with opcodes |
| 4604 | that are expanding to wide branches end up having formats that |
| 4605 | are not determinable by the RELAX_IMMED_STEPX enumeration, and |
| 4606 | we can't tell directly what format the relaxer picked. This |
| 4607 | is a wart in the design of the relaxer that should someday be |
| 4608 | fixed, but would require major changes, or at least should |
| 4609 | be accompanied by major changes to make use of that data. |
| 4610 | |
| 4611 | In any event, we can tell that we are expanding from a single-slot |
| 4612 | format to a wider one with the logic below. */ |
| 4613 | |
| 4614 | int i; |
| 4615 | int relaxed_size = fmt_size + fragP->tc_frag_data.text_expansion[0]; |
| 4616 | |
| 4617 | for (i = 0; i < xtensa_isa_num_formats (isa); i++) |
| 4618 | { |
| 4619 | if (relaxed_size == xtensa_format_length (isa, i)) |
| 4620 | return relaxed_size; |
| 4621 | } |
| 4622 | |
| 4623 | return 3; |
| 4624 | } |
| 4625 | |
| 4626 | if (fragP->tc_frag_data.slot_subtypes[0] == RELAX_NARROW) |
| 4627 | return 2 + fragP->tc_frag_data.text_expansion[0]; |
| 4628 | |
| 4629 | return fmt_size; |
| 4630 | } |
| 4631 | |
| 4632 | |
| 4633 | static int |
| 4634 | next_frag_format_size (const fragS *fragP) |
| 4635 | { |
| 4636 | const fragS *next_fragP = next_non_empty_frag (fragP); |
| 4637 | return frag_format_size (next_fragP); |
| 4638 | } |
| 4639 | |
| 4640 | |
| 4641 | /* In early Xtensa Processors, for reasons that are unclear, the ISA |
| 4642 | required two-byte instructions to be treated as three-byte instructions |
| 4643 | for loop instruction alignment. This restriction was removed beginning |
| 4644 | with Xtensa LX. Now the only requirement on loop instruction alignment |
| 4645 | is that the first instruction of the loop must appear at an address that |
| 4646 | does not cross a fetch boundary. */ |
| 4647 | |
| 4648 | static int |
| 4649 | get_loop_align_size (int insn_size) |
| 4650 | { |
| 4651 | if (insn_size == XTENSA_UNDEFINED) |
| 4652 | return xtensa_fetch_width; |
| 4653 | |
| 4654 | if (enforce_three_byte_loop_align && insn_size == 2) |
| 4655 | return 3; |
| 4656 | |
| 4657 | return insn_size; |
| 4658 | } |
| 4659 | |
| 4660 | |
| 4661 | /* If the next legit fragment is an end-of-loop marker, |
| 4662 | switch its state so it will instantiate a NOP. */ |
| 4663 | |
| 4664 | static void |
| 4665 | update_next_frag_state (fragS *fragP) |
| 4666 | { |
| 4667 | fragS *next_fragP = fragP->fr_next; |
| 4668 | fragS *new_target = NULL; |
| 4669 | |
| 4670 | if (align_targets) |
| 4671 | { |
| 4672 | /* We are guaranteed there will be one of these... */ |
| 4673 | while (!(next_fragP->fr_type == rs_machine_dependent |
| 4674 | && (next_fragP->fr_subtype == RELAX_MAYBE_UNREACHABLE |
| 4675 | || next_fragP->fr_subtype == RELAX_UNREACHABLE))) |
| 4676 | next_fragP = next_fragP->fr_next; |
| 4677 | |
| 4678 | gas_assert (next_fragP->fr_type == rs_machine_dependent |
| 4679 | && (next_fragP->fr_subtype == RELAX_MAYBE_UNREACHABLE |
| 4680 | || next_fragP->fr_subtype == RELAX_UNREACHABLE)); |
| 4681 | |
| 4682 | /* ...and one of these. */ |
| 4683 | new_target = next_fragP->fr_next; |
| 4684 | while (!(new_target->fr_type == rs_machine_dependent |
| 4685 | && (new_target->fr_subtype == RELAX_MAYBE_DESIRE_ALIGN |
| 4686 | || new_target->fr_subtype == RELAX_DESIRE_ALIGN))) |
| 4687 | new_target = new_target->fr_next; |
| 4688 | |
| 4689 | gas_assert (new_target->fr_type == rs_machine_dependent |
| 4690 | && (new_target->fr_subtype == RELAX_MAYBE_DESIRE_ALIGN |
| 4691 | || new_target->fr_subtype == RELAX_DESIRE_ALIGN)); |
| 4692 | } |
| 4693 | |
| 4694 | while (next_fragP && next_fragP->fr_fix == 0) |
| 4695 | { |
| 4696 | if (next_fragP->fr_type == rs_machine_dependent |
| 4697 | && next_fragP->fr_subtype == RELAX_LOOP_END) |
| 4698 | { |
| 4699 | next_fragP->fr_subtype = RELAX_LOOP_END_ADD_NOP; |
| 4700 | return; |
| 4701 | } |
| 4702 | |
| 4703 | next_fragP = next_fragP->fr_next; |
| 4704 | } |
| 4705 | } |
| 4706 | |
| 4707 | |
| 4708 | static bfd_boolean |
| 4709 | next_frag_is_branch_target (const fragS *fragP) |
| 4710 | { |
| 4711 | /* Sometimes an empty will end up here due to storage allocation issues, |
| 4712 | so we have to skip until we find something legit. */ |
| 4713 | for (fragP = fragP->fr_next; fragP; fragP = fragP->fr_next) |
| 4714 | { |
| 4715 | if (fragP->tc_frag_data.is_branch_target) |
| 4716 | return TRUE; |
| 4717 | if (fragP->fr_fix != 0) |
| 4718 | break; |
| 4719 | } |
| 4720 | return FALSE; |
| 4721 | } |
| 4722 | |
| 4723 | |
| 4724 | static bfd_boolean |
| 4725 | next_frag_is_loop_target (const fragS *fragP) |
| 4726 | { |
| 4727 | /* Sometimes an empty will end up here due storage allocation issues. |
| 4728 | So we have to skip until we find something legit. */ |
| 4729 | for (fragP = fragP->fr_next; fragP; fragP = fragP->fr_next) |
| 4730 | { |
| 4731 | if (fragP->tc_frag_data.is_loop_target) |
| 4732 | return TRUE; |
| 4733 | if (fragP->fr_fix != 0) |
| 4734 | break; |
| 4735 | } |
| 4736 | return FALSE; |
| 4737 | } |
| 4738 | |
| 4739 | |
| 4740 | /* As specified in the relaxation table, when a loop instruction is |
| 4741 | relaxed, there are 24 bytes between the loop instruction itself and |
| 4742 | the first instruction in the loop. */ |
| 4743 | |
| 4744 | #define RELAXED_LOOP_INSN_BYTES 24 |
| 4745 | |
| 4746 | static addressT |
| 4747 | next_frag_pre_opcode_bytes (const fragS *fragp) |
| 4748 | { |
| 4749 | const fragS *next_fragp = fragp->fr_next; |
| 4750 | xtensa_opcode next_opcode; |
| 4751 | |
| 4752 | if (!next_frag_opcode_is_loop (fragp, &next_opcode)) |
| 4753 | return 0; |
| 4754 | |
| 4755 | /* Sometimes an empty will end up here due to storage allocation issues, |
| 4756 | so we have to skip until we find something legit. */ |
| 4757 | while (next_fragp->fr_fix == 0) |
| 4758 | next_fragp = next_fragp->fr_next; |
| 4759 | |
| 4760 | if (next_fragp->fr_type != rs_machine_dependent) |
| 4761 | return 0; |
| 4762 | |
| 4763 | /* There is some implicit knowledge encoded in here. |
| 4764 | The LOOP instructions that are NOT RELAX_IMMED have |
| 4765 | been relaxed. Note that we can assume that the LOOP |
| 4766 | instruction is in slot 0 because loops aren't bundleable. */ |
| 4767 | if (next_fragp->tc_frag_data.slot_subtypes[0] > RELAX_IMMED) |
| 4768 | return get_expanded_loop_offset (next_opcode) + RELAXED_LOOP_INSN_BYTES; |
| 4769 | |
| 4770 | return 0; |
| 4771 | } |
| 4772 | |
| 4773 | |
| 4774 | /* Mark a location where we can later insert literal frags. Update |
| 4775 | the section's literal_pool_loc, so subsequent literals can be |
| 4776 | placed nearest to their use. */ |
| 4777 | |
| 4778 | static void |
| 4779 | xtensa_mark_literal_pool_location (void) |
| 4780 | { |
| 4781 | /* Any labels pointing to the current location need |
| 4782 | to be adjusted to after the literal pool. */ |
| 4783 | emit_state s; |
| 4784 | fragS *pool_location; |
| 4785 | |
| 4786 | if (use_literal_section) |
| 4787 | return; |
| 4788 | |
| 4789 | /* We stash info in these frags so we can later move the literal's |
| 4790 | fixes into this frchain's fix list. */ |
| 4791 | pool_location = frag_now; |
| 4792 | frag_now->tc_frag_data.lit_frchain = frchain_now; |
| 4793 | frag_now->tc_frag_data.literal_frag = frag_now; |
| 4794 | /* Just record this frag. */ |
| 4795 | xtensa_maybe_create_literal_pool_frag (FALSE, FALSE); |
| 4796 | frag_variant (rs_machine_dependent, 0, 0, |
| 4797 | RELAX_LITERAL_POOL_BEGIN, NULL, 0, NULL); |
| 4798 | xtensa_set_frag_assembly_state (frag_now); |
| 4799 | frag_now->tc_frag_data.lit_seg = now_seg; |
| 4800 | frag_variant (rs_machine_dependent, 0, 0, |
| 4801 | RELAX_LITERAL_POOL_END, NULL, 0, NULL); |
| 4802 | xtensa_set_frag_assembly_state (frag_now); |
| 4803 | |
| 4804 | /* Now put a frag into the literal pool that points to this location. */ |
| 4805 | set_literal_pool_location (now_seg, pool_location); |
| 4806 | xtensa_switch_to_non_abs_literal_fragment (&s); |
| 4807 | frag_align (2, 0, 0); |
| 4808 | record_alignment (now_seg, 2); |
| 4809 | |
| 4810 | /* Close whatever frag is there. */ |
| 4811 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 4812 | xtensa_set_frag_assembly_state (frag_now); |
| 4813 | frag_now->tc_frag_data.literal_frag = pool_location; |
| 4814 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 4815 | xtensa_restore_emit_state (&s); |
| 4816 | xtensa_set_frag_assembly_state (frag_now); |
| 4817 | } |
| 4818 | |
| 4819 | |
| 4820 | /* Build a nop of the correct size into tinsn. */ |
| 4821 | |
| 4822 | static void |
| 4823 | build_nop (TInsn *tinsn, int size) |
| 4824 | { |
| 4825 | tinsn_init (tinsn); |
| 4826 | switch (size) |
| 4827 | { |
| 4828 | case 2: |
| 4829 | tinsn->opcode = xtensa_nop_n_opcode; |
| 4830 | tinsn->ntok = 0; |
| 4831 | if (tinsn->opcode == XTENSA_UNDEFINED) |
| 4832 | as_fatal (_("opcode 'NOP.N' unavailable in this configuration")); |
| 4833 | break; |
| 4834 | |
| 4835 | case 3: |
| 4836 | if (xtensa_nop_opcode == XTENSA_UNDEFINED) |
| 4837 | { |
| 4838 | tinsn->opcode = xtensa_or_opcode; |
| 4839 | set_expr_const (&tinsn->tok[0], 1); |
| 4840 | set_expr_const (&tinsn->tok[1], 1); |
| 4841 | set_expr_const (&tinsn->tok[2], 1); |
| 4842 | tinsn->ntok = 3; |
| 4843 | } |
| 4844 | else |
| 4845 | tinsn->opcode = xtensa_nop_opcode; |
| 4846 | |
| 4847 | gas_assert (tinsn->opcode != XTENSA_UNDEFINED); |
| 4848 | } |
| 4849 | } |
| 4850 | |
| 4851 | |
| 4852 | /* Assemble a NOP of the requested size in the buffer. User must have |
| 4853 | allocated "buf" with at least "size" bytes. */ |
| 4854 | |
| 4855 | static void |
| 4856 | assemble_nop (int size, char *buf) |
| 4857 | { |
| 4858 | static xtensa_insnbuf insnbuf = NULL; |
| 4859 | TInsn tinsn; |
| 4860 | |
| 4861 | build_nop (&tinsn, size); |
| 4862 | |
| 4863 | if (!insnbuf) |
| 4864 | insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa); |
| 4865 | |
| 4866 | tinsn_to_insnbuf (&tinsn, insnbuf); |
| 4867 | xtensa_insnbuf_to_chars (xtensa_default_isa, insnbuf, |
| 4868 | (unsigned char *) buf, 0); |
| 4869 | } |
| 4870 | |
| 4871 | |
| 4872 | /* Return the number of bytes for the offset of the expanded loop |
| 4873 | instruction. This should be incorporated into the relaxation |
| 4874 | specification but is hard-coded here. This is used to auto-align |
| 4875 | the loop instruction. It is invalid to call this function if the |
| 4876 | configuration does not have loops or if the opcode is not a loop |
| 4877 | opcode. */ |
| 4878 | |
| 4879 | static addressT |
| 4880 | get_expanded_loop_offset (xtensa_opcode opcode) |
| 4881 | { |
| 4882 | /* This is the OFFSET of the loop instruction in the expanded loop. |
| 4883 | This MUST correspond directly to the specification of the loop |
| 4884 | expansion. It will be validated on fragment conversion. */ |
| 4885 | gas_assert (opcode != XTENSA_UNDEFINED); |
| 4886 | if (opcode == xtensa_loop_opcode) |
| 4887 | return 0; |
| 4888 | if (opcode == xtensa_loopnez_opcode) |
| 4889 | return 3; |
| 4890 | if (opcode == xtensa_loopgtz_opcode) |
| 4891 | return 6; |
| 4892 | as_fatal (_("get_expanded_loop_offset: invalid opcode")); |
| 4893 | return 0; |
| 4894 | } |
| 4895 | |
| 4896 | |
| 4897 | static fragS * |
| 4898 | get_literal_pool_location (segT seg) |
| 4899 | { |
| 4900 | struct litpool_seg *lps = litpool_seg_list.next; |
| 4901 | struct litpool_frag *lpf; |
| 4902 | for ( ; lps && lps->seg->id != seg->id; lps = lps->next) |
| 4903 | ; |
| 4904 | if (lps) |
| 4905 | { |
| 4906 | for (lpf = lps->frag_list.prev; lpf->fragP; lpf = lpf->prev) |
| 4907 | { /* Skip "candidates" for now. */ |
| 4908 | if (lpf->fragP->fr_subtype == RELAX_LITERAL_POOL_BEGIN && |
| 4909 | lpf->priority == 1) |
| 4910 | return lpf->fragP; |
| 4911 | } |
| 4912 | /* Must convert a lower-priority pool. */ |
| 4913 | for (lpf = lps->frag_list.prev; lpf->fragP; lpf = lpf->prev) |
| 4914 | { |
| 4915 | if (lpf->fragP->fr_subtype == RELAX_LITERAL_POOL_BEGIN) |
| 4916 | return lpf->fragP; |
| 4917 | } |
| 4918 | /* Still no match -- try for a low priority pool. */ |
| 4919 | for (lpf = lps->frag_list.prev; lpf->fragP; lpf = lpf->prev) |
| 4920 | { |
| 4921 | if (lpf->fragP->fr_subtype == RELAX_LITERAL_POOL_CANDIDATE_BEGIN) |
| 4922 | return lpf->fragP; |
| 4923 | } |
| 4924 | } |
| 4925 | return seg_info (seg)->tc_segment_info_data.literal_pool_loc; |
| 4926 | } |
| 4927 | |
| 4928 | |
| 4929 | static void |
| 4930 | set_literal_pool_location (segT seg, fragS *literal_pool_loc) |
| 4931 | { |
| 4932 | seg_info (seg)->tc_segment_info_data.literal_pool_loc = literal_pool_loc; |
| 4933 | } |
| 4934 | |
| 4935 | |
| 4936 | /* Set frag assembly state should be called when a new frag is |
| 4937 | opened and after a frag has been closed. */ |
| 4938 | |
| 4939 | static void |
| 4940 | xtensa_set_frag_assembly_state (fragS *fragP) |
| 4941 | { |
| 4942 | if (!density_supported) |
| 4943 | fragP->tc_frag_data.is_no_density = TRUE; |
| 4944 | |
| 4945 | /* This function is called from subsegs_finish, which is called |
| 4946 | after xtensa_end, so we can't use "use_transform" or |
| 4947 | "use_schedule" here. */ |
| 4948 | if (!directive_state[directive_transform]) |
| 4949 | fragP->tc_frag_data.is_no_transform = TRUE; |
| 4950 | if (directive_state[directive_longcalls]) |
| 4951 | fragP->tc_frag_data.use_longcalls = TRUE; |
| 4952 | fragP->tc_frag_data.use_absolute_literals = |
| 4953 | directive_state[directive_absolute_literals]; |
| 4954 | fragP->tc_frag_data.is_assembly_state_set = TRUE; |
| 4955 | } |
| 4956 | |
| 4957 | |
| 4958 | static bfd_boolean |
| 4959 | relaxable_section (asection *sec) |
| 4960 | { |
| 4961 | return ((sec->flags & SEC_DEBUGGING) == 0 |
| 4962 | && strcmp (sec->name, ".eh_frame") != 0); |
| 4963 | } |
| 4964 | |
| 4965 | |
| 4966 | static void |
| 4967 | xtensa_mark_frags_for_org (void) |
| 4968 | { |
| 4969 | segT *seclist; |
| 4970 | |
| 4971 | /* Walk over each fragment of all of the current segments. If we find |
| 4972 | a .org frag in any of the segments, mark all frags prior to it as |
| 4973 | "no transform", which will prevent linker optimizations from messing |
| 4974 | up the .org distance. This should be done after |
| 4975 | xtensa_find_unmarked_state_frags, because we don't want to worry here |
| 4976 | about that function trashing the data we save here. */ |
| 4977 | |
| 4978 | for (seclist = &stdoutput->sections; |
| 4979 | seclist && *seclist; |
| 4980 | seclist = &(*seclist)->next) |
| 4981 | { |
| 4982 | segT sec = *seclist; |
| 4983 | segment_info_type *seginfo; |
| 4984 | fragS *fragP; |
| 4985 | flagword flags; |
| 4986 | flags = bfd_get_section_flags (stdoutput, sec); |
| 4987 | if (flags & SEC_DEBUGGING) |
| 4988 | continue; |
| 4989 | if (!(flags & SEC_ALLOC)) |
| 4990 | continue; |
| 4991 | |
| 4992 | seginfo = seg_info (sec); |
| 4993 | if (seginfo && seginfo->frchainP) |
| 4994 | { |
| 4995 | fragS *last_fragP = seginfo->frchainP->frch_root; |
| 4996 | for (fragP = seginfo->frchainP->frch_root; fragP; |
| 4997 | fragP = fragP->fr_next) |
| 4998 | { |
| 4999 | /* cvt_frag_to_fill has changed the fr_type of org frags to |
| 5000 | rs_fill, so use the value as cached in rs_subtype here. */ |
| 5001 | if (fragP->fr_subtype == RELAX_ORG) |
| 5002 | { |
| 5003 | while (last_fragP != fragP->fr_next) |
| 5004 | { |
| 5005 | last_fragP->tc_frag_data.is_no_transform = TRUE; |
| 5006 | last_fragP = last_fragP->fr_next; |
| 5007 | } |
| 5008 | } |
| 5009 | } |
| 5010 | } |
| 5011 | } |
| 5012 | } |
| 5013 | |
| 5014 | |
| 5015 | static void |
| 5016 | xtensa_find_unmarked_state_frags (void) |
| 5017 | { |
| 5018 | segT *seclist; |
| 5019 | |
| 5020 | /* Walk over each fragment of all of the current segments. For each |
| 5021 | unmarked fragment, mark it with the same info as the previous |
| 5022 | fragment. */ |
| 5023 | for (seclist = &stdoutput->sections; |
| 5024 | seclist && *seclist; |
| 5025 | seclist = &(*seclist)->next) |
| 5026 | { |
| 5027 | segT sec = *seclist; |
| 5028 | segment_info_type *seginfo; |
| 5029 | fragS *fragP; |
| 5030 | flagword flags; |
| 5031 | flags = bfd_get_section_flags (stdoutput, sec); |
| 5032 | if (flags & SEC_DEBUGGING) |
| 5033 | continue; |
| 5034 | if (!(flags & SEC_ALLOC)) |
| 5035 | continue; |
| 5036 | |
| 5037 | seginfo = seg_info (sec); |
| 5038 | if (seginfo && seginfo->frchainP) |
| 5039 | { |
| 5040 | fragS *last_fragP = 0; |
| 5041 | for (fragP = seginfo->frchainP->frch_root; fragP; |
| 5042 | fragP = fragP->fr_next) |
| 5043 | { |
| 5044 | if (fragP->fr_fix != 0 |
| 5045 | && !fragP->tc_frag_data.is_assembly_state_set) |
| 5046 | { |
| 5047 | if (last_fragP == 0) |
| 5048 | { |
| 5049 | as_warn_where (fragP->fr_file, fragP->fr_line, |
| 5050 | _("assembly state not set for first frag in section %s"), |
| 5051 | sec->name); |
| 5052 | } |
| 5053 | else |
| 5054 | { |
| 5055 | fragP->tc_frag_data.is_assembly_state_set = TRUE; |
| 5056 | fragP->tc_frag_data.is_no_density = |
| 5057 | last_fragP->tc_frag_data.is_no_density; |
| 5058 | fragP->tc_frag_data.is_no_transform = |
| 5059 | last_fragP->tc_frag_data.is_no_transform; |
| 5060 | fragP->tc_frag_data.use_longcalls = |
| 5061 | last_fragP->tc_frag_data.use_longcalls; |
| 5062 | fragP->tc_frag_data.use_absolute_literals = |
| 5063 | last_fragP->tc_frag_data.use_absolute_literals; |
| 5064 | } |
| 5065 | } |
| 5066 | if (fragP->tc_frag_data.is_assembly_state_set) |
| 5067 | last_fragP = fragP; |
| 5068 | } |
| 5069 | } |
| 5070 | } |
| 5071 | } |
| 5072 | |
| 5073 | |
| 5074 | static void |
| 5075 | xtensa_find_unaligned_branch_targets (bfd *abfd ATTRIBUTE_UNUSED, |
| 5076 | asection *sec, |
| 5077 | void *unused ATTRIBUTE_UNUSED) |
| 5078 | { |
| 5079 | flagword flags = bfd_get_section_flags (abfd, sec); |
| 5080 | segment_info_type *seginfo = seg_info (sec); |
| 5081 | fragS *frag = seginfo->frchainP->frch_root; |
| 5082 | |
| 5083 | if (flags & SEC_CODE) |
| 5084 | { |
| 5085 | xtensa_isa isa = xtensa_default_isa; |
| 5086 | xtensa_insnbuf insnbuf = xtensa_insnbuf_alloc (isa); |
| 5087 | while (frag != NULL) |
| 5088 | { |
| 5089 | if (frag->tc_frag_data.is_branch_target) |
| 5090 | { |
| 5091 | int op_size; |
| 5092 | addressT branch_align, frag_addr; |
| 5093 | xtensa_format fmt; |
| 5094 | |
| 5095 | xtensa_insnbuf_from_chars |
| 5096 | (isa, insnbuf, (unsigned char *) frag->fr_literal, 0); |
| 5097 | fmt = xtensa_format_decode (isa, insnbuf); |
| 5098 | op_size = xtensa_format_length (isa, fmt); |
| 5099 | branch_align = 1 << branch_align_power (sec); |
| 5100 | frag_addr = frag->fr_address % branch_align; |
| 5101 | if (frag_addr + op_size > branch_align) |
| 5102 | as_warn_where (frag->fr_file, frag->fr_line, |
| 5103 | _("unaligned branch target: %d bytes at 0x%lx"), |
| 5104 | op_size, (long) frag->fr_address); |
| 5105 | } |
| 5106 | frag = frag->fr_next; |
| 5107 | } |
| 5108 | xtensa_insnbuf_free (isa, insnbuf); |
| 5109 | } |
| 5110 | } |
| 5111 | |
| 5112 | |
| 5113 | static void |
| 5114 | xtensa_find_unaligned_loops (bfd *abfd ATTRIBUTE_UNUSED, |
| 5115 | asection *sec, |
| 5116 | void *unused ATTRIBUTE_UNUSED) |
| 5117 | { |
| 5118 | flagword flags = bfd_get_section_flags (abfd, sec); |
| 5119 | segment_info_type *seginfo = seg_info (sec); |
| 5120 | fragS *frag = seginfo->frchainP->frch_root; |
| 5121 | xtensa_isa isa = xtensa_default_isa; |
| 5122 | |
| 5123 | if (flags & SEC_CODE) |
| 5124 | { |
| 5125 | xtensa_insnbuf insnbuf = xtensa_insnbuf_alloc (isa); |
| 5126 | while (frag != NULL) |
| 5127 | { |
| 5128 | if (frag->tc_frag_data.is_first_loop_insn) |
| 5129 | { |
| 5130 | int op_size; |
| 5131 | addressT frag_addr; |
| 5132 | xtensa_format fmt; |
| 5133 | |
| 5134 | if (frag->fr_fix == 0) |
| 5135 | frag = next_non_empty_frag (frag); |
| 5136 | |
| 5137 | if (frag) |
| 5138 | { |
| 5139 | xtensa_insnbuf_from_chars |
| 5140 | (isa, insnbuf, (unsigned char *) frag->fr_literal, 0); |
| 5141 | fmt = xtensa_format_decode (isa, insnbuf); |
| 5142 | op_size = xtensa_format_length (isa, fmt); |
| 5143 | frag_addr = frag->fr_address % xtensa_fetch_width; |
| 5144 | |
| 5145 | if (frag_addr + op_size > xtensa_fetch_width) |
| 5146 | as_warn_where (frag->fr_file, frag->fr_line, |
| 5147 | _("unaligned loop: %d bytes at 0x%lx"), |
| 5148 | op_size, (long) frag->fr_address); |
| 5149 | } |
| 5150 | } |
| 5151 | frag = frag->fr_next; |
| 5152 | } |
| 5153 | xtensa_insnbuf_free (isa, insnbuf); |
| 5154 | } |
| 5155 | } |
| 5156 | |
| 5157 | |
| 5158 | static int |
| 5159 | xg_apply_fix_value (fixS *fixP, valueT val) |
| 5160 | { |
| 5161 | xtensa_isa isa = xtensa_default_isa; |
| 5162 | static xtensa_insnbuf insnbuf = NULL; |
| 5163 | static xtensa_insnbuf slotbuf = NULL; |
| 5164 | xtensa_format fmt; |
| 5165 | int slot; |
| 5166 | bfd_boolean alt_reloc; |
| 5167 | xtensa_opcode opcode; |
| 5168 | char *const fixpos = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 5169 | |
| 5170 | if (decode_reloc (fixP->fx_r_type, &slot, &alt_reloc) |
| 5171 | || alt_reloc) |
| 5172 | as_fatal (_("unexpected fix")); |
| 5173 | |
| 5174 | if (!insnbuf) |
| 5175 | { |
| 5176 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 5177 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 5178 | } |
| 5179 | |
| 5180 | xtensa_insnbuf_from_chars (isa, insnbuf, (unsigned char *) fixpos, 0); |
| 5181 | fmt = xtensa_format_decode (isa, insnbuf); |
| 5182 | if (fmt == XTENSA_UNDEFINED) |
| 5183 | as_fatal (_("undecodable fix")); |
| 5184 | xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf); |
| 5185 | opcode = xtensa_opcode_decode (isa, fmt, slot, slotbuf); |
| 5186 | if (opcode == XTENSA_UNDEFINED) |
| 5187 | as_fatal (_("undecodable fix")); |
| 5188 | |
| 5189 | /* CONST16 immediates are not PC-relative, despite the fact that we |
| 5190 | reuse the normal PC-relative operand relocations for the low part |
| 5191 | of a CONST16 operand. */ |
| 5192 | if (opcode == xtensa_const16_opcode) |
| 5193 | return 0; |
| 5194 | |
| 5195 | xtensa_insnbuf_set_operand (slotbuf, fmt, slot, opcode, |
| 5196 | get_relaxable_immed (opcode), val, |
| 5197 | fixP->fx_file, fixP->fx_line); |
| 5198 | |
| 5199 | xtensa_format_set_slot (isa, fmt, slot, insnbuf, slotbuf); |
| 5200 | xtensa_insnbuf_to_chars (isa, insnbuf, (unsigned char *) fixpos, 0); |
| 5201 | |
| 5202 | return 1; |
| 5203 | } |
| 5204 | |
| 5205 | \f |
| 5206 | /* External Functions and Other GAS Hooks. */ |
| 5207 | |
| 5208 | const char * |
| 5209 | xtensa_target_format (void) |
| 5210 | { |
| 5211 | return (target_big_endian ? "elf32-xtensa-be" : "elf32-xtensa-le"); |
| 5212 | } |
| 5213 | |
| 5214 | |
| 5215 | void |
| 5216 | xtensa_file_arch_init (bfd *abfd) |
| 5217 | { |
| 5218 | bfd_set_private_flags (abfd, 0x100 | 0x200); |
| 5219 | } |
| 5220 | |
| 5221 | |
| 5222 | void |
| 5223 | md_number_to_chars (char *buf, valueT val, int n) |
| 5224 | { |
| 5225 | if (target_big_endian) |
| 5226 | number_to_chars_bigendian (buf, val, n); |
| 5227 | else |
| 5228 | number_to_chars_littleendian (buf, val, n); |
| 5229 | } |
| 5230 | |
| 5231 | |
| 5232 | /* This function is called once, at assembler startup time. It should |
| 5233 | set up all the tables, etc. that the MD part of the assembler will |
| 5234 | need. */ |
| 5235 | |
| 5236 | void |
| 5237 | md_begin (void) |
| 5238 | { |
| 5239 | segT current_section = now_seg; |
| 5240 | int current_subsec = now_subseg; |
| 5241 | xtensa_isa isa; |
| 5242 | int i; |
| 5243 | |
| 5244 | xtensa_default_isa = xtensa_isa_init (0, 0); |
| 5245 | isa = xtensa_default_isa; |
| 5246 | |
| 5247 | linkrelax = 1; |
| 5248 | |
| 5249 | /* Set up the literal sections. */ |
| 5250 | memset (&default_lit_sections, 0, sizeof (default_lit_sections)); |
| 5251 | |
| 5252 | subseg_set (current_section, current_subsec); |
| 5253 | |
| 5254 | xtensa_addi_opcode = xtensa_opcode_lookup (isa, "addi"); |
| 5255 | xtensa_addmi_opcode = xtensa_opcode_lookup (isa, "addmi"); |
| 5256 | xtensa_call0_opcode = xtensa_opcode_lookup (isa, "call0"); |
| 5257 | xtensa_call4_opcode = xtensa_opcode_lookup (isa, "call4"); |
| 5258 | xtensa_call8_opcode = xtensa_opcode_lookup (isa, "call8"); |
| 5259 | xtensa_call12_opcode = xtensa_opcode_lookup (isa, "call12"); |
| 5260 | xtensa_callx0_opcode = xtensa_opcode_lookup (isa, "callx0"); |
| 5261 | xtensa_callx4_opcode = xtensa_opcode_lookup (isa, "callx4"); |
| 5262 | xtensa_callx8_opcode = xtensa_opcode_lookup (isa, "callx8"); |
| 5263 | xtensa_callx12_opcode = xtensa_opcode_lookup (isa, "callx12"); |
| 5264 | xtensa_const16_opcode = xtensa_opcode_lookup (isa, "const16"); |
| 5265 | xtensa_entry_opcode = xtensa_opcode_lookup (isa, "entry"); |
| 5266 | xtensa_extui_opcode = xtensa_opcode_lookup (isa, "extui"); |
| 5267 | xtensa_movi_opcode = xtensa_opcode_lookup (isa, "movi"); |
| 5268 | xtensa_movi_n_opcode = xtensa_opcode_lookup (isa, "movi.n"); |
| 5269 | xtensa_isync_opcode = xtensa_opcode_lookup (isa, "isync"); |
| 5270 | xtensa_j_opcode = xtensa_opcode_lookup (isa, "j"); |
| 5271 | xtensa_jx_opcode = xtensa_opcode_lookup (isa, "jx"); |
| 5272 | xtensa_l32r_opcode = xtensa_opcode_lookup (isa, "l32r"); |
| 5273 | xtensa_loop_opcode = xtensa_opcode_lookup (isa, "loop"); |
| 5274 | xtensa_loopnez_opcode = xtensa_opcode_lookup (isa, "loopnez"); |
| 5275 | xtensa_loopgtz_opcode = xtensa_opcode_lookup (isa, "loopgtz"); |
| 5276 | xtensa_nop_opcode = xtensa_opcode_lookup (isa, "nop"); |
| 5277 | xtensa_nop_n_opcode = xtensa_opcode_lookup (isa, "nop.n"); |
| 5278 | xtensa_or_opcode = xtensa_opcode_lookup (isa, "or"); |
| 5279 | xtensa_ret_opcode = xtensa_opcode_lookup (isa, "ret"); |
| 5280 | xtensa_ret_n_opcode = xtensa_opcode_lookup (isa, "ret.n"); |
| 5281 | xtensa_retw_opcode = xtensa_opcode_lookup (isa, "retw"); |
| 5282 | xtensa_retw_n_opcode = xtensa_opcode_lookup (isa, "retw.n"); |
| 5283 | xtensa_rsr_lcount_opcode = xtensa_opcode_lookup (isa, "rsr.lcount"); |
| 5284 | xtensa_waiti_opcode = xtensa_opcode_lookup (isa, "waiti"); |
| 5285 | |
| 5286 | for (i = 0; i < xtensa_isa_num_formats (isa); i++) |
| 5287 | { |
| 5288 | int format_slots = xtensa_format_num_slots (isa, i); |
| 5289 | if (format_slots > config_max_slots) |
| 5290 | config_max_slots = format_slots; |
| 5291 | } |
| 5292 | |
| 5293 | xg_init_vinsn (&cur_vinsn); |
| 5294 | |
| 5295 | xtensa_num_pipe_stages = xtensa_isa_num_pipe_stages (isa); |
| 5296 | |
| 5297 | init_op_placement_info_table (); |
| 5298 | |
| 5299 | /* Set up the assembly state. */ |
| 5300 | if (!frag_now->tc_frag_data.is_assembly_state_set) |
| 5301 | xtensa_set_frag_assembly_state (frag_now); |
| 5302 | } |
| 5303 | |
| 5304 | |
| 5305 | /* TC_INIT_FIX_DATA hook */ |
| 5306 | |
| 5307 | void |
| 5308 | xtensa_init_fix_data (fixS *x) |
| 5309 | { |
| 5310 | x->tc_fix_data.slot = 0; |
| 5311 | x->tc_fix_data.X_add_symbol = NULL; |
| 5312 | x->tc_fix_data.X_add_number = 0; |
| 5313 | } |
| 5314 | |
| 5315 | |
| 5316 | /* tc_frob_label hook */ |
| 5317 | |
| 5318 | void |
| 5319 | xtensa_frob_label (symbolS *sym) |
| 5320 | { |
| 5321 | float freq; |
| 5322 | |
| 5323 | if (cur_vinsn.inside_bundle) |
| 5324 | { |
| 5325 | as_bad (_("labels are not valid inside bundles")); |
| 5326 | return; |
| 5327 | } |
| 5328 | |
| 5329 | freq = get_subseg_target_freq (now_seg, now_subseg); |
| 5330 | |
| 5331 | /* Since the label was already attached to a frag associated with the |
| 5332 | previous basic block, it now needs to be reset to the current frag. */ |
| 5333 | symbol_set_frag (sym, frag_now); |
| 5334 | S_SET_VALUE (sym, (valueT) frag_now_fix ()); |
| 5335 | |
| 5336 | if (generating_literals) |
| 5337 | xtensa_add_literal_sym (sym); |
| 5338 | else |
| 5339 | xtensa_add_insn_label (sym); |
| 5340 | |
| 5341 | if (symbol_get_tc (sym)->is_loop_target) |
| 5342 | { |
| 5343 | if ((get_last_insn_flags (now_seg, now_subseg) |
| 5344 | & FLAG_IS_BAD_LOOPEND) != 0) |
| 5345 | as_bad (_("invalid last instruction for a zero-overhead loop")); |
| 5346 | |
| 5347 | xtensa_set_frag_assembly_state (frag_now); |
| 5348 | frag_var (rs_machine_dependent, 4, 4, RELAX_LOOP_END, |
| 5349 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 5350 | |
| 5351 | xtensa_set_frag_assembly_state (frag_now); |
| 5352 | xtensa_move_labels (frag_now, 0); |
| 5353 | } |
| 5354 | |
| 5355 | /* No target aligning in the absolute section. */ |
| 5356 | if (now_seg != absolute_section |
| 5357 | && !is_unaligned_label (sym) |
| 5358 | && !generating_literals) |
| 5359 | { |
| 5360 | xtensa_set_frag_assembly_state (frag_now); |
| 5361 | |
| 5362 | if (do_align_targets ()) |
| 5363 | frag_var (rs_machine_dependent, 0, (int) freq, |
| 5364 | RELAX_DESIRE_ALIGN_IF_TARGET, frag_now->fr_symbol, |
| 5365 | frag_now->fr_offset, NULL); |
| 5366 | else |
| 5367 | frag_var (rs_fill, 0, 0, frag_now->fr_subtype, |
| 5368 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 5369 | xtensa_set_frag_assembly_state (frag_now); |
| 5370 | xtensa_move_labels (frag_now, 0); |
| 5371 | } |
| 5372 | |
| 5373 | /* We need to mark the following properties even if we aren't aligning. */ |
| 5374 | |
| 5375 | /* If the label is already known to be a branch target, i.e., a |
| 5376 | forward branch, mark the frag accordingly. Backward branches |
| 5377 | are handled by xg_add_branch_and_loop_targets. */ |
| 5378 | if (symbol_get_tc (sym)->is_branch_target) |
| 5379 | symbol_get_frag (sym)->tc_frag_data.is_branch_target = TRUE; |
| 5380 | |
| 5381 | /* Loops only go forward, so they can be identified here. */ |
| 5382 | if (symbol_get_tc (sym)->is_loop_target) |
| 5383 | symbol_get_frag (sym)->tc_frag_data.is_loop_target = TRUE; |
| 5384 | |
| 5385 | dwarf2_emit_label (sym); |
| 5386 | } |
| 5387 | |
| 5388 | |
| 5389 | /* tc_unrecognized_line hook */ |
| 5390 | |
| 5391 | int |
| 5392 | xtensa_unrecognized_line (int ch) |
| 5393 | { |
| 5394 | switch (ch) |
| 5395 | { |
| 5396 | case '{' : |
| 5397 | if (cur_vinsn.inside_bundle == 0) |
| 5398 | { |
| 5399 | /* PR8110: Cannot emit line number info inside a FLIX bundle |
| 5400 | when using --gstabs. Temporarily disable debug info. */ |
| 5401 | generate_lineno_debug (); |
| 5402 | if (debug_type == DEBUG_STABS) |
| 5403 | { |
| 5404 | xt_saved_debug_type = debug_type; |
| 5405 | debug_type = DEBUG_NONE; |
| 5406 | } |
| 5407 | |
| 5408 | cur_vinsn.inside_bundle = 1; |
| 5409 | } |
| 5410 | else |
| 5411 | { |
| 5412 | as_bad (_("extra opening brace")); |
| 5413 | return 0; |
| 5414 | } |
| 5415 | break; |
| 5416 | |
| 5417 | case '}' : |
| 5418 | if (cur_vinsn.inside_bundle) |
| 5419 | finish_vinsn (&cur_vinsn); |
| 5420 | else |
| 5421 | { |
| 5422 | as_bad (_("extra closing brace")); |
| 5423 | return 0; |
| 5424 | } |
| 5425 | break; |
| 5426 | default: |
| 5427 | as_bad (_("syntax error")); |
| 5428 | return 0; |
| 5429 | } |
| 5430 | return 1; |
| 5431 | } |
| 5432 | |
| 5433 | |
| 5434 | /* md_flush_pending_output hook */ |
| 5435 | |
| 5436 | void |
| 5437 | xtensa_flush_pending_output (void) |
| 5438 | { |
| 5439 | /* This line fixes a bug where automatically generated gstabs info |
| 5440 | separates a function label from its entry instruction, ending up |
| 5441 | with the literal position between the function label and the entry |
| 5442 | instruction and crashing code. It only happens with --gstabs and |
| 5443 | --text-section-literals, and when several other obscure relaxation |
| 5444 | conditions are met. */ |
| 5445 | if (outputting_stabs_line_debug) |
| 5446 | return; |
| 5447 | |
| 5448 | if (cur_vinsn.inside_bundle) |
| 5449 | as_bad (_("missing closing brace")); |
| 5450 | |
| 5451 | /* If there is a non-zero instruction fragment, close it. */ |
| 5452 | if (frag_now_fix () != 0 && frag_now->tc_frag_data.is_insn) |
| 5453 | { |
| 5454 | frag_wane (frag_now); |
| 5455 | frag_new (0); |
| 5456 | xtensa_set_frag_assembly_state (frag_now); |
| 5457 | } |
| 5458 | frag_now->tc_frag_data.is_insn = FALSE; |
| 5459 | |
| 5460 | xtensa_clear_insn_labels (); |
| 5461 | } |
| 5462 | |
| 5463 | |
| 5464 | /* We had an error while parsing an instruction. The string might look |
| 5465 | like this: "insn arg1, arg2 }". If so, we need to see the closing |
| 5466 | brace and reset some fields. Otherwise, the vinsn never gets closed |
| 5467 | and the num_slots field will grow past the end of the array of slots, |
| 5468 | and bad things happen. */ |
| 5469 | |
| 5470 | static void |
| 5471 | error_reset_cur_vinsn (void) |
| 5472 | { |
| 5473 | if (cur_vinsn.inside_bundle) |
| 5474 | { |
| 5475 | if (*input_line_pointer == '}' |
| 5476 | || *(input_line_pointer - 1) == '}' |
| 5477 | || *(input_line_pointer - 2) == '}') |
| 5478 | xg_clear_vinsn (&cur_vinsn); |
| 5479 | } |
| 5480 | } |
| 5481 | |
| 5482 | |
| 5483 | void |
| 5484 | md_assemble (char *str) |
| 5485 | { |
| 5486 | xtensa_isa isa = xtensa_default_isa; |
| 5487 | char *opname; |
| 5488 | unsigned opnamelen; |
| 5489 | bfd_boolean has_underbar = FALSE; |
| 5490 | char *arg_strings[MAX_INSN_ARGS]; |
| 5491 | int num_args; |
| 5492 | TInsn orig_insn; /* Original instruction from the input. */ |
| 5493 | |
| 5494 | tinsn_init (&orig_insn); |
| 5495 | |
| 5496 | /* Split off the opcode. */ |
| 5497 | opnamelen = strspn (str, "abcdefghijklmnopqrstuvwxyz_/0123456789."); |
| 5498 | opname = xstrndup (str, opnamelen); |
| 5499 | |
| 5500 | num_args = tokenize_arguments (arg_strings, str + opnamelen); |
| 5501 | if (num_args == -1) |
| 5502 | { |
| 5503 | as_bad (_("syntax error")); |
| 5504 | return; |
| 5505 | } |
| 5506 | |
| 5507 | if (xg_translate_idioms (&opname, &num_args, arg_strings)) |
| 5508 | return; |
| 5509 | |
| 5510 | /* Check for an underbar prefix. */ |
| 5511 | if (*opname == '_') |
| 5512 | { |
| 5513 | has_underbar = TRUE; |
| 5514 | opname += 1; |
| 5515 | } |
| 5516 | |
| 5517 | orig_insn.insn_type = ITYPE_INSN; |
| 5518 | orig_insn.ntok = 0; |
| 5519 | orig_insn.is_specific_opcode = (has_underbar || !use_transform ()); |
| 5520 | orig_insn.opcode = xtensa_opcode_lookup (isa, opname); |
| 5521 | |
| 5522 | /* Special case: Check for "CALLXn.TLS" psuedo op. If found, grab its |
| 5523 | extra argument and set the opcode to "CALLXn". */ |
| 5524 | if (orig_insn.opcode == XTENSA_UNDEFINED |
| 5525 | && strncasecmp (opname, "callx", 5) == 0) |
| 5526 | { |
| 5527 | unsigned long window_size; |
| 5528 | char *suffix; |
| 5529 | |
| 5530 | window_size = strtoul (opname + 5, &suffix, 10); |
| 5531 | if (suffix != opname + 5 |
| 5532 | && (window_size == 0 |
| 5533 | || window_size == 4 |
| 5534 | || window_size == 8 |
| 5535 | || window_size == 12) |
| 5536 | && strcasecmp (suffix, ".tls") == 0) |
| 5537 | { |
| 5538 | switch (window_size) |
| 5539 | { |
| 5540 | case 0: orig_insn.opcode = xtensa_callx0_opcode; break; |
| 5541 | case 4: orig_insn.opcode = xtensa_callx4_opcode; break; |
| 5542 | case 8: orig_insn.opcode = xtensa_callx8_opcode; break; |
| 5543 | case 12: orig_insn.opcode = xtensa_callx12_opcode; break; |
| 5544 | } |
| 5545 | |
| 5546 | if (num_args != 2) |
| 5547 | as_bad (_("wrong number of operands for '%s'"), opname); |
| 5548 | else |
| 5549 | { |
| 5550 | bfd_reloc_code_real_type reloc; |
| 5551 | char *old_input_line_pointer; |
| 5552 | expressionS *tok = &orig_insn.extra_arg; |
| 5553 | |
| 5554 | old_input_line_pointer = input_line_pointer; |
| 5555 | input_line_pointer = arg_strings[num_args - 1]; |
| 5556 | |
| 5557 | expression (tok); |
| 5558 | if (tok->X_op == O_symbol |
| 5559 | && ((reloc = xtensa_elf_suffix (&input_line_pointer, tok)) |
| 5560 | == BFD_RELOC_XTENSA_TLS_CALL)) |
| 5561 | tok->X_op = map_suffix_reloc_to_operator (reloc); |
| 5562 | else |
| 5563 | as_bad (_("bad relocation expression for '%s'"), opname); |
| 5564 | |
| 5565 | input_line_pointer = old_input_line_pointer; |
| 5566 | num_args -= 1; |
| 5567 | } |
| 5568 | } |
| 5569 | } |
| 5570 | |
| 5571 | /* Special case: Check for "j.l" psuedo op. */ |
| 5572 | if (orig_insn.opcode == XTENSA_UNDEFINED |
| 5573 | && strncasecmp (opname, "j.l", 3) == 0) |
| 5574 | { |
| 5575 | if (num_args != 2) |
| 5576 | as_bad (_("wrong number of operands for '%s'"), opname); |
| 5577 | else |
| 5578 | { |
| 5579 | char *old_input_line_pointer; |
| 5580 | expressionS *tok = &orig_insn.extra_arg; |
| 5581 | |
| 5582 | old_input_line_pointer = input_line_pointer; |
| 5583 | input_line_pointer = arg_strings[num_args - 1]; |
| 5584 | |
| 5585 | expression_maybe_register (xtensa_jx_opcode, 0, tok); |
| 5586 | input_line_pointer = old_input_line_pointer; |
| 5587 | |
| 5588 | num_args -= 1; |
| 5589 | orig_insn.opcode = xtensa_j_opcode; |
| 5590 | } |
| 5591 | } |
| 5592 | |
| 5593 | if (orig_insn.opcode == XTENSA_UNDEFINED) |
| 5594 | { |
| 5595 | xtensa_format fmt = xtensa_format_lookup (isa, opname); |
| 5596 | if (fmt == XTENSA_UNDEFINED) |
| 5597 | { |
| 5598 | as_bad (_("unknown opcode or format name '%s'"), opname); |
| 5599 | error_reset_cur_vinsn (); |
| 5600 | return; |
| 5601 | } |
| 5602 | if (!cur_vinsn.inside_bundle) |
| 5603 | { |
| 5604 | as_bad (_("format names only valid inside bundles")); |
| 5605 | error_reset_cur_vinsn (); |
| 5606 | return; |
| 5607 | } |
| 5608 | if (cur_vinsn.format != XTENSA_UNDEFINED) |
| 5609 | as_warn (_("multiple formats specified for one bundle; using '%s'"), |
| 5610 | opname); |
| 5611 | cur_vinsn.format = fmt; |
| 5612 | free (has_underbar ? opname - 1 : opname); |
| 5613 | error_reset_cur_vinsn (); |
| 5614 | return; |
| 5615 | } |
| 5616 | |
| 5617 | /* Parse the arguments. */ |
| 5618 | if (parse_arguments (&orig_insn, num_args, arg_strings)) |
| 5619 | { |
| 5620 | as_bad (_("syntax error")); |
| 5621 | error_reset_cur_vinsn (); |
| 5622 | return; |
| 5623 | } |
| 5624 | |
| 5625 | /* Free the opcode and argument strings, now that they've been parsed. */ |
| 5626 | free (has_underbar ? opname - 1 : opname); |
| 5627 | opname = 0; |
| 5628 | while (num_args-- > 0) |
| 5629 | free (arg_strings[num_args]); |
| 5630 | |
| 5631 | /* Get expressions for invisible operands. */ |
| 5632 | if (get_invisible_operands (&orig_insn)) |
| 5633 | { |
| 5634 | error_reset_cur_vinsn (); |
| 5635 | return; |
| 5636 | } |
| 5637 | |
| 5638 | /* Check for the right number and type of arguments. */ |
| 5639 | if (tinsn_check_arguments (&orig_insn)) |
| 5640 | { |
| 5641 | error_reset_cur_vinsn (); |
| 5642 | return; |
| 5643 | } |
| 5644 | |
| 5645 | /* Record the line number for each TInsn, because a FLIX bundle may be |
| 5646 | spread across multiple input lines and individual instructions may be |
| 5647 | moved around in some cases. */ |
| 5648 | orig_insn.loc_directive_seen = dwarf2_loc_directive_seen; |
| 5649 | dwarf2_where (&orig_insn.debug_line); |
| 5650 | dwarf2_consume_line_info (); |
| 5651 | |
| 5652 | xg_add_branch_and_loop_targets (&orig_insn); |
| 5653 | |
| 5654 | /* Check that immediate value for ENTRY is >= 16. */ |
| 5655 | if (orig_insn.opcode == xtensa_entry_opcode && orig_insn.ntok >= 3) |
| 5656 | { |
| 5657 | expressionS *exp = &orig_insn.tok[2]; |
| 5658 | if (exp->X_op == O_constant && exp->X_add_number < 16) |
| 5659 | as_warn (_("entry instruction with stack decrement < 16")); |
| 5660 | } |
| 5661 | |
| 5662 | /* Finish it off: |
| 5663 | assemble_tokens (opcode, tok, ntok); |
| 5664 | expand the tokens from the orig_insn into the |
| 5665 | stack of instructions that will not expand |
| 5666 | unless required at relaxation time. */ |
| 5667 | |
| 5668 | if (!cur_vinsn.inside_bundle) |
| 5669 | emit_single_op (&orig_insn); |
| 5670 | else /* We are inside a bundle. */ |
| 5671 | { |
| 5672 | cur_vinsn.slots[cur_vinsn.num_slots] = orig_insn; |
| 5673 | cur_vinsn.num_slots++; |
| 5674 | if (*input_line_pointer == '}' |
| 5675 | || *(input_line_pointer - 1) == '}' |
| 5676 | || *(input_line_pointer - 2) == '}') |
| 5677 | finish_vinsn (&cur_vinsn); |
| 5678 | } |
| 5679 | |
| 5680 | /* We've just emitted a new instruction so clear the list of labels. */ |
| 5681 | xtensa_clear_insn_labels (); |
| 5682 | |
| 5683 | xtensa_check_frag_count (); |
| 5684 | } |
| 5685 | |
| 5686 | |
| 5687 | /* HANDLE_ALIGN hook */ |
| 5688 | |
| 5689 | /* For a .align directive, we mark the previous block with the alignment |
| 5690 | information. This will be placed in the object file in the |
| 5691 | property section corresponding to this section. */ |
| 5692 | |
| 5693 | void |
| 5694 | xtensa_handle_align (fragS *fragP) |
| 5695 | { |
| 5696 | if (linkrelax |
| 5697 | && ! fragP->tc_frag_data.is_literal |
| 5698 | && (fragP->fr_type == rs_align |
| 5699 | || fragP->fr_type == rs_align_code) |
| 5700 | && fragP->fr_offset > 0 |
| 5701 | && now_seg != bss_section) |
| 5702 | { |
| 5703 | fragP->tc_frag_data.is_align = TRUE; |
| 5704 | fragP->tc_frag_data.alignment = fragP->fr_offset; |
| 5705 | } |
| 5706 | |
| 5707 | if (fragP->fr_type == rs_align_test) |
| 5708 | { |
| 5709 | int count; |
| 5710 | count = fragP->fr_next->fr_address - fragP->fr_address - fragP->fr_fix; |
| 5711 | if (count != 0) |
| 5712 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 5713 | _("unaligned entry instruction")); |
| 5714 | } |
| 5715 | |
| 5716 | if (linkrelax && fragP->fr_type == rs_org) |
| 5717 | fragP->fr_subtype = RELAX_ORG; |
| 5718 | } |
| 5719 | |
| 5720 | |
| 5721 | /* TC_FRAG_INIT hook */ |
| 5722 | |
| 5723 | void |
| 5724 | xtensa_frag_init (fragS *frag) |
| 5725 | { |
| 5726 | xtensa_set_frag_assembly_state (frag); |
| 5727 | } |
| 5728 | |
| 5729 | |
| 5730 | symbolS * |
| 5731 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 5732 | { |
| 5733 | return NULL; |
| 5734 | } |
| 5735 | |
| 5736 | |
| 5737 | /* Round up a section size to the appropriate boundary. */ |
| 5738 | |
| 5739 | valueT |
| 5740 | md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size) |
| 5741 | { |
| 5742 | return size; /* Byte alignment is fine. */ |
| 5743 | } |
| 5744 | |
| 5745 | |
| 5746 | long |
| 5747 | md_pcrel_from (fixS *fixP) |
| 5748 | { |
| 5749 | char *insn_p; |
| 5750 | static xtensa_insnbuf insnbuf = NULL; |
| 5751 | static xtensa_insnbuf slotbuf = NULL; |
| 5752 | int opnum; |
| 5753 | uint32 opnd_value; |
| 5754 | xtensa_opcode opcode; |
| 5755 | xtensa_format fmt; |
| 5756 | int slot; |
| 5757 | xtensa_isa isa = xtensa_default_isa; |
| 5758 | valueT addr = fixP->fx_where + fixP->fx_frag->fr_address; |
| 5759 | bfd_boolean alt_reloc; |
| 5760 | |
| 5761 | if (fixP->fx_r_type == BFD_RELOC_XTENSA_ASM_EXPAND) |
| 5762 | return 0; |
| 5763 | |
| 5764 | if (fixP->fx_r_type == BFD_RELOC_32_PCREL) |
| 5765 | return addr; |
| 5766 | |
| 5767 | if (!insnbuf) |
| 5768 | { |
| 5769 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 5770 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 5771 | } |
| 5772 | |
| 5773 | insn_p = &fixP->fx_frag->fr_literal[fixP->fx_where]; |
| 5774 | xtensa_insnbuf_from_chars (isa, insnbuf, (unsigned char *) insn_p, 0); |
| 5775 | fmt = xtensa_format_decode (isa, insnbuf); |
| 5776 | |
| 5777 | if (fmt == XTENSA_UNDEFINED) |
| 5778 | as_fatal (_("bad instruction format")); |
| 5779 | |
| 5780 | if (decode_reloc (fixP->fx_r_type, &slot, &alt_reloc) != 0) |
| 5781 | as_fatal (_("invalid relocation")); |
| 5782 | |
| 5783 | xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf); |
| 5784 | opcode = xtensa_opcode_decode (isa, fmt, slot, slotbuf); |
| 5785 | |
| 5786 | /* Check for "alternate" relocations (operand not specified). None |
| 5787 | of the current uses for these are really PC-relative. */ |
| 5788 | if (alt_reloc || opcode == xtensa_const16_opcode) |
| 5789 | { |
| 5790 | if (opcode != xtensa_l32r_opcode |
| 5791 | && opcode != xtensa_const16_opcode) |
| 5792 | as_fatal (_("invalid relocation for '%s' instruction"), |
| 5793 | xtensa_opcode_name (isa, opcode)); |
| 5794 | return 0; |
| 5795 | } |
| 5796 | |
| 5797 | opnum = get_relaxable_immed (opcode); |
| 5798 | opnd_value = 0; |
| 5799 | if (xtensa_operand_is_PCrelative (isa, opcode, opnum) != 1 |
| 5800 | || xtensa_operand_do_reloc (isa, opcode, opnum, &opnd_value, addr)) |
| 5801 | { |
| 5802 | as_bad_where (fixP->fx_file, |
| 5803 | fixP->fx_line, |
| 5804 | _("invalid relocation for operand %d of '%s'"), |
| 5805 | opnum, xtensa_opcode_name (isa, opcode)); |
| 5806 | return 0; |
| 5807 | } |
| 5808 | return 0 - opnd_value; |
| 5809 | } |
| 5810 | |
| 5811 | |
| 5812 | /* TC_FORCE_RELOCATION hook */ |
| 5813 | |
| 5814 | int |
| 5815 | xtensa_force_relocation (fixS *fix) |
| 5816 | { |
| 5817 | switch (fix->fx_r_type) |
| 5818 | { |
| 5819 | case BFD_RELOC_XTENSA_ASM_EXPAND: |
| 5820 | case BFD_RELOC_XTENSA_SLOT0_ALT: |
| 5821 | case BFD_RELOC_XTENSA_SLOT1_ALT: |
| 5822 | case BFD_RELOC_XTENSA_SLOT2_ALT: |
| 5823 | case BFD_RELOC_XTENSA_SLOT3_ALT: |
| 5824 | case BFD_RELOC_XTENSA_SLOT4_ALT: |
| 5825 | case BFD_RELOC_XTENSA_SLOT5_ALT: |
| 5826 | case BFD_RELOC_XTENSA_SLOT6_ALT: |
| 5827 | case BFD_RELOC_XTENSA_SLOT7_ALT: |
| 5828 | case BFD_RELOC_XTENSA_SLOT8_ALT: |
| 5829 | case BFD_RELOC_XTENSA_SLOT9_ALT: |
| 5830 | case BFD_RELOC_XTENSA_SLOT10_ALT: |
| 5831 | case BFD_RELOC_XTENSA_SLOT11_ALT: |
| 5832 | case BFD_RELOC_XTENSA_SLOT12_ALT: |
| 5833 | case BFD_RELOC_XTENSA_SLOT13_ALT: |
| 5834 | case BFD_RELOC_XTENSA_SLOT14_ALT: |
| 5835 | return 1; |
| 5836 | default: |
| 5837 | break; |
| 5838 | } |
| 5839 | |
| 5840 | if (linkrelax && fix->fx_addsy |
| 5841 | && relaxable_section (S_GET_SEGMENT (fix->fx_addsy))) |
| 5842 | return 1; |
| 5843 | |
| 5844 | return generic_force_reloc (fix); |
| 5845 | } |
| 5846 | |
| 5847 | |
| 5848 | /* TC_VALIDATE_FIX_SUB hook */ |
| 5849 | |
| 5850 | int |
| 5851 | xtensa_validate_fix_sub (fixS *fix) |
| 5852 | { |
| 5853 | segT add_symbol_segment, sub_symbol_segment; |
| 5854 | |
| 5855 | /* The difference of two symbols should be resolved by the assembler when |
| 5856 | linkrelax is not set. If the linker may relax the section containing |
| 5857 | the symbols, then an Xtensa DIFF relocation must be generated so that |
| 5858 | the linker knows to adjust the difference value. */ |
| 5859 | if (!linkrelax || fix->fx_addsy == NULL) |
| 5860 | return 0; |
| 5861 | |
| 5862 | /* Make sure both symbols are in the same segment, and that segment is |
| 5863 | "normal" and relaxable. If the segment is not "normal", then the |
| 5864 | fix is not valid. If the segment is not "relaxable", then the fix |
| 5865 | should have been handled earlier. */ |
| 5866 | add_symbol_segment = S_GET_SEGMENT (fix->fx_addsy); |
| 5867 | if (! SEG_NORMAL (add_symbol_segment) || |
| 5868 | ! relaxable_section (add_symbol_segment)) |
| 5869 | return 0; |
| 5870 | sub_symbol_segment = S_GET_SEGMENT (fix->fx_subsy); |
| 5871 | return (sub_symbol_segment == add_symbol_segment); |
| 5872 | } |
| 5873 | |
| 5874 | |
| 5875 | /* NO_PSEUDO_DOT hook */ |
| 5876 | |
| 5877 | /* This function has nothing to do with pseudo dots, but this is the |
| 5878 | nearest macro to where the check needs to take place. FIXME: This |
| 5879 | seems wrong. */ |
| 5880 | |
| 5881 | bfd_boolean |
| 5882 | xtensa_check_inside_bundle (void) |
| 5883 | { |
| 5884 | if (cur_vinsn.inside_bundle && input_line_pointer[-1] == '.') |
| 5885 | as_bad (_("directives are not valid inside bundles")); |
| 5886 | |
| 5887 | /* This function must always return FALSE because it is called via a |
| 5888 | macro that has nothing to do with bundling. */ |
| 5889 | return FALSE; |
| 5890 | } |
| 5891 | |
| 5892 | |
| 5893 | /* md_elf_section_change_hook */ |
| 5894 | |
| 5895 | void |
| 5896 | xtensa_elf_section_change_hook (void) |
| 5897 | { |
| 5898 | /* Set up the assembly state. */ |
| 5899 | if (!frag_now->tc_frag_data.is_assembly_state_set) |
| 5900 | xtensa_set_frag_assembly_state (frag_now); |
| 5901 | } |
| 5902 | |
| 5903 | |
| 5904 | /* tc_fix_adjustable hook */ |
| 5905 | |
| 5906 | bfd_boolean |
| 5907 | xtensa_fix_adjustable (fixS *fixP) |
| 5908 | { |
| 5909 | /* We need the symbol name for the VTABLE entries. */ |
| 5910 | if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 5911 | || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 5912 | return 0; |
| 5913 | |
| 5914 | return 1; |
| 5915 | } |
| 5916 | |
| 5917 | |
| 5918 | /* tc_symbol_new_hook */ |
| 5919 | |
| 5920 | symbolS *expr_symbols = NULL; |
| 5921 | |
| 5922 | void |
| 5923 | xtensa_symbol_new_hook (symbolS *sym) |
| 5924 | { |
| 5925 | if (is_leb128_expr && S_GET_SEGMENT (sym) == expr_section) |
| 5926 | { |
| 5927 | symbol_get_tc (sym)->next_expr_symbol = expr_symbols; |
| 5928 | expr_symbols = sym; |
| 5929 | } |
| 5930 | } |
| 5931 | |
| 5932 | |
| 5933 | void |
| 5934 | md_apply_fix (fixS *fixP, valueT *valP, segT seg) |
| 5935 | { |
| 5936 | char *const fixpos = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 5937 | valueT val = 0; |
| 5938 | |
| 5939 | /* Subtracted symbols are only allowed for a few relocation types, and |
| 5940 | unless linkrelax is enabled, they should not make it to this point. */ |
| 5941 | if (fixP->fx_subsy && !(linkrelax && (fixP->fx_r_type == BFD_RELOC_32 |
| 5942 | || fixP->fx_r_type == BFD_RELOC_16 |
| 5943 | || fixP->fx_r_type == BFD_RELOC_8))) |
| 5944 | as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); |
| 5945 | |
| 5946 | switch (fixP->fx_r_type) |
| 5947 | { |
| 5948 | case BFD_RELOC_32_PCREL: |
| 5949 | case BFD_RELOC_32: |
| 5950 | case BFD_RELOC_16: |
| 5951 | case BFD_RELOC_8: |
| 5952 | if (fixP->fx_subsy) |
| 5953 | { |
| 5954 | switch (fixP->fx_r_type) |
| 5955 | { |
| 5956 | case BFD_RELOC_8: |
| 5957 | fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF8; |
| 5958 | fixP->fx_signed = 0; |
| 5959 | break; |
| 5960 | case BFD_RELOC_16: |
| 5961 | fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF16; |
| 5962 | fixP->fx_signed = 0; |
| 5963 | break; |
| 5964 | case BFD_RELOC_32: |
| 5965 | fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF32; |
| 5966 | fixP->fx_signed = 0; |
| 5967 | break; |
| 5968 | default: |
| 5969 | break; |
| 5970 | } |
| 5971 | |
| 5972 | val = (S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset |
| 5973 | - S_GET_VALUE (fixP->fx_subsy)); |
| 5974 | |
| 5975 | /* The difference value gets written out, and the DIFF reloc |
| 5976 | identifies the address of the subtracted symbol (i.e., the one |
| 5977 | with the lowest address). */ |
| 5978 | *valP = val; |
| 5979 | fixP->fx_offset -= val; |
| 5980 | fixP->fx_subsy = NULL; |
| 5981 | } |
| 5982 | else if (! fixP->fx_addsy) |
| 5983 | { |
| 5984 | val = *valP; |
| 5985 | fixP->fx_done = 1; |
| 5986 | } |
| 5987 | /* fall through */ |
| 5988 | |
| 5989 | case BFD_RELOC_XTENSA_PLT: |
| 5990 | md_number_to_chars (fixpos, val, fixP->fx_size); |
| 5991 | fixP->fx_no_overflow = 0; /* Use the standard overflow check. */ |
| 5992 | break; |
| 5993 | |
| 5994 | case BFD_RELOC_XTENSA_TLSDESC_FN: |
| 5995 | case BFD_RELOC_XTENSA_TLSDESC_ARG: |
| 5996 | case BFD_RELOC_XTENSA_TLS_TPOFF: |
| 5997 | case BFD_RELOC_XTENSA_TLS_DTPOFF: |
| 5998 | S_SET_THREAD_LOCAL (fixP->fx_addsy); |
| 5999 | md_number_to_chars (fixpos, 0, fixP->fx_size); |
| 6000 | fixP->fx_no_overflow = 0; /* Use the standard overflow check. */ |
| 6001 | break; |
| 6002 | |
| 6003 | case BFD_RELOC_XTENSA_SLOT0_OP: |
| 6004 | case BFD_RELOC_XTENSA_SLOT1_OP: |
| 6005 | case BFD_RELOC_XTENSA_SLOT2_OP: |
| 6006 | case BFD_RELOC_XTENSA_SLOT3_OP: |
| 6007 | case BFD_RELOC_XTENSA_SLOT4_OP: |
| 6008 | case BFD_RELOC_XTENSA_SLOT5_OP: |
| 6009 | case BFD_RELOC_XTENSA_SLOT6_OP: |
| 6010 | case BFD_RELOC_XTENSA_SLOT7_OP: |
| 6011 | case BFD_RELOC_XTENSA_SLOT8_OP: |
| 6012 | case BFD_RELOC_XTENSA_SLOT9_OP: |
| 6013 | case BFD_RELOC_XTENSA_SLOT10_OP: |
| 6014 | case BFD_RELOC_XTENSA_SLOT11_OP: |
| 6015 | case BFD_RELOC_XTENSA_SLOT12_OP: |
| 6016 | case BFD_RELOC_XTENSA_SLOT13_OP: |
| 6017 | case BFD_RELOC_XTENSA_SLOT14_OP: |
| 6018 | if (linkrelax) |
| 6019 | { |
| 6020 | /* Write the tentative value of a PC-relative relocation to a |
| 6021 | local symbol into the instruction. The value will be ignored |
| 6022 | by the linker, and it makes the object file disassembly |
| 6023 | readable when all branch targets are encoded in relocations. */ |
| 6024 | |
| 6025 | gas_assert (fixP->fx_addsy); |
| 6026 | if (S_GET_SEGMENT (fixP->fx_addsy) == seg |
| 6027 | && !S_FORCE_RELOC (fixP->fx_addsy, 1)) |
| 6028 | { |
| 6029 | val = (S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset |
| 6030 | - md_pcrel_from (fixP)); |
| 6031 | (void) xg_apply_fix_value (fixP, val); |
| 6032 | } |
| 6033 | } |
| 6034 | else if (! fixP->fx_addsy) |
| 6035 | { |
| 6036 | val = *valP; |
| 6037 | if (xg_apply_fix_value (fixP, val)) |
| 6038 | fixP->fx_done = 1; |
| 6039 | } |
| 6040 | break; |
| 6041 | |
| 6042 | case BFD_RELOC_XTENSA_ASM_EXPAND: |
| 6043 | case BFD_RELOC_XTENSA_TLS_FUNC: |
| 6044 | case BFD_RELOC_XTENSA_TLS_ARG: |
| 6045 | case BFD_RELOC_XTENSA_TLS_CALL: |
| 6046 | case BFD_RELOC_XTENSA_SLOT0_ALT: |
| 6047 | case BFD_RELOC_XTENSA_SLOT1_ALT: |
| 6048 | case BFD_RELOC_XTENSA_SLOT2_ALT: |
| 6049 | case BFD_RELOC_XTENSA_SLOT3_ALT: |
| 6050 | case BFD_RELOC_XTENSA_SLOT4_ALT: |
| 6051 | case BFD_RELOC_XTENSA_SLOT5_ALT: |
| 6052 | case BFD_RELOC_XTENSA_SLOT6_ALT: |
| 6053 | case BFD_RELOC_XTENSA_SLOT7_ALT: |
| 6054 | case BFD_RELOC_XTENSA_SLOT8_ALT: |
| 6055 | case BFD_RELOC_XTENSA_SLOT9_ALT: |
| 6056 | case BFD_RELOC_XTENSA_SLOT10_ALT: |
| 6057 | case BFD_RELOC_XTENSA_SLOT11_ALT: |
| 6058 | case BFD_RELOC_XTENSA_SLOT12_ALT: |
| 6059 | case BFD_RELOC_XTENSA_SLOT13_ALT: |
| 6060 | case BFD_RELOC_XTENSA_SLOT14_ALT: |
| 6061 | /* These all need to be resolved at link-time. Do nothing now. */ |
| 6062 | break; |
| 6063 | |
| 6064 | case BFD_RELOC_VTABLE_INHERIT: |
| 6065 | case BFD_RELOC_VTABLE_ENTRY: |
| 6066 | fixP->fx_done = 0; |
| 6067 | break; |
| 6068 | |
| 6069 | default: |
| 6070 | as_bad (_("unhandled local relocation fix %s"), |
| 6071 | bfd_get_reloc_code_name (fixP->fx_r_type)); |
| 6072 | } |
| 6073 | } |
| 6074 | |
| 6075 | |
| 6076 | char * |
| 6077 | md_atof (int type, char *litP, int *sizeP) |
| 6078 | { |
| 6079 | return ieee_md_atof (type, litP, sizeP, target_big_endian); |
| 6080 | } |
| 6081 | |
| 6082 | |
| 6083 | int |
| 6084 | md_estimate_size_before_relax (fragS *fragP, segT seg ATTRIBUTE_UNUSED) |
| 6085 | { |
| 6086 | return total_frag_text_expansion (fragP); |
| 6087 | } |
| 6088 | |
| 6089 | |
| 6090 | /* Translate internal representation of relocation info to BFD target |
| 6091 | format. */ |
| 6092 | |
| 6093 | arelent * |
| 6094 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) |
| 6095 | { |
| 6096 | arelent *reloc; |
| 6097 | |
| 6098 | reloc = (arelent *) xmalloc (sizeof (arelent)); |
| 6099 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 6100 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 6101 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 6102 | |
| 6103 | /* Make sure none of our internal relocations make it this far. |
| 6104 | They'd better have been fully resolved by this point. */ |
| 6105 | gas_assert ((int) fixp->fx_r_type > 0); |
| 6106 | |
| 6107 | reloc->addend = fixp->fx_offset; |
| 6108 | |
| 6109 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); |
| 6110 | if (reloc->howto == NULL) |
| 6111 | { |
| 6112 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 6113 | _("cannot represent `%s' relocation in object file"), |
| 6114 | bfd_get_reloc_code_name (fixp->fx_r_type)); |
| 6115 | free (reloc->sym_ptr_ptr); |
| 6116 | free (reloc); |
| 6117 | return NULL; |
| 6118 | } |
| 6119 | |
| 6120 | if (!fixp->fx_pcrel != !reloc->howto->pc_relative) |
| 6121 | as_fatal (_("internal error; cannot generate `%s' relocation"), |
| 6122 | bfd_get_reloc_code_name (fixp->fx_r_type)); |
| 6123 | |
| 6124 | return reloc; |
| 6125 | } |
| 6126 | |
| 6127 | \f |
| 6128 | /* Checks for resource conflicts between instructions. */ |
| 6129 | |
| 6130 | /* The func unit stuff could be implemented as bit-vectors rather |
| 6131 | than the iterative approach here. If it ends up being too |
| 6132 | slow, we will switch it. */ |
| 6133 | |
| 6134 | resource_table * |
| 6135 | new_resource_table (void *data, |
| 6136 | int cycles, |
| 6137 | int nu, |
| 6138 | unit_num_copies_func uncf, |
| 6139 | opcode_num_units_func onuf, |
| 6140 | opcode_funcUnit_use_unit_func ouuf, |
| 6141 | opcode_funcUnit_use_stage_func ousf) |
| 6142 | { |
| 6143 | int i; |
| 6144 | resource_table *rt = (resource_table *) xmalloc (sizeof (resource_table)); |
| 6145 | rt->data = data; |
| 6146 | rt->cycles = cycles; |
| 6147 | rt->allocated_cycles = cycles; |
| 6148 | rt->num_units = nu; |
| 6149 | rt->unit_num_copies = uncf; |
| 6150 | rt->opcode_num_units = onuf; |
| 6151 | rt->opcode_unit_use = ouuf; |
| 6152 | rt->opcode_unit_stage = ousf; |
| 6153 | |
| 6154 | rt->units = (unsigned char **) xcalloc (cycles, sizeof (unsigned char *)); |
| 6155 | for (i = 0; i < cycles; i++) |
| 6156 | rt->units[i] = (unsigned char *) xcalloc (nu, sizeof (unsigned char)); |
| 6157 | |
| 6158 | return rt; |
| 6159 | } |
| 6160 | |
| 6161 | |
| 6162 | void |
| 6163 | clear_resource_table (resource_table *rt) |
| 6164 | { |
| 6165 | int i, j; |
| 6166 | for (i = 0; i < rt->allocated_cycles; i++) |
| 6167 | for (j = 0; j < rt->num_units; j++) |
| 6168 | rt->units[i][j] = 0; |
| 6169 | } |
| 6170 | |
| 6171 | |
| 6172 | /* We never shrink it, just fake it into thinking so. */ |
| 6173 | |
| 6174 | void |
| 6175 | resize_resource_table (resource_table *rt, int cycles) |
| 6176 | { |
| 6177 | int i, old_cycles; |
| 6178 | |
| 6179 | rt->cycles = cycles; |
| 6180 | if (cycles <= rt->allocated_cycles) |
| 6181 | return; |
| 6182 | |
| 6183 | old_cycles = rt->allocated_cycles; |
| 6184 | rt->allocated_cycles = cycles; |
| 6185 | |
| 6186 | rt->units = xrealloc (rt->units, |
| 6187 | rt->allocated_cycles * sizeof (unsigned char *)); |
| 6188 | for (i = 0; i < old_cycles; i++) |
| 6189 | rt->units[i] = xrealloc (rt->units[i], |
| 6190 | rt->num_units * sizeof (unsigned char)); |
| 6191 | for (i = old_cycles; i < cycles; i++) |
| 6192 | rt->units[i] = xcalloc (rt->num_units, sizeof (unsigned char)); |
| 6193 | } |
| 6194 | |
| 6195 | |
| 6196 | bfd_boolean |
| 6197 | resources_available (resource_table *rt, xtensa_opcode opcode, int cycle) |
| 6198 | { |
| 6199 | int i; |
| 6200 | int uses = (rt->opcode_num_units) (rt->data, opcode); |
| 6201 | |
| 6202 | for (i = 0; i < uses; i++) |
| 6203 | { |
| 6204 | xtensa_funcUnit unit = (rt->opcode_unit_use) (rt->data, opcode, i); |
| 6205 | int stage = (rt->opcode_unit_stage) (rt->data, opcode, i); |
| 6206 | int copies_in_use = rt->units[stage + cycle][unit]; |
| 6207 | int copies = (rt->unit_num_copies) (rt->data, unit); |
| 6208 | if (copies_in_use >= copies) |
| 6209 | return FALSE; |
| 6210 | } |
| 6211 | return TRUE; |
| 6212 | } |
| 6213 | |
| 6214 | |
| 6215 | void |
| 6216 | reserve_resources (resource_table *rt, xtensa_opcode opcode, int cycle) |
| 6217 | { |
| 6218 | int i; |
| 6219 | int uses = (rt->opcode_num_units) (rt->data, opcode); |
| 6220 | |
| 6221 | for (i = 0; i < uses; i++) |
| 6222 | { |
| 6223 | xtensa_funcUnit unit = (rt->opcode_unit_use) (rt->data, opcode, i); |
| 6224 | int stage = (rt->opcode_unit_stage) (rt->data, opcode, i); |
| 6225 | /* Note that this allows resources to be oversubscribed. That's |
| 6226 | essential to the way the optional scheduler works. |
| 6227 | resources_available reports when a resource is over-subscribed, |
| 6228 | so it's easy to tell. */ |
| 6229 | rt->units[stage + cycle][unit]++; |
| 6230 | } |
| 6231 | } |
| 6232 | |
| 6233 | |
| 6234 | void |
| 6235 | release_resources (resource_table *rt, xtensa_opcode opcode, int cycle) |
| 6236 | { |
| 6237 | int i; |
| 6238 | int uses = (rt->opcode_num_units) (rt->data, opcode); |
| 6239 | |
| 6240 | for (i = 0; i < uses; i++) |
| 6241 | { |
| 6242 | xtensa_funcUnit unit = (rt->opcode_unit_use) (rt->data, opcode, i); |
| 6243 | int stage = (rt->opcode_unit_stage) (rt->data, opcode, i); |
| 6244 | gas_assert (rt->units[stage + cycle][unit] > 0); |
| 6245 | rt->units[stage + cycle][unit]--; |
| 6246 | } |
| 6247 | } |
| 6248 | |
| 6249 | |
| 6250 | /* Wrapper functions make parameterized resource reservation |
| 6251 | more convenient. */ |
| 6252 | |
| 6253 | int |
| 6254 | opcode_funcUnit_use_unit (void *data, xtensa_opcode opcode, int idx) |
| 6255 | { |
| 6256 | xtensa_funcUnit_use *use = xtensa_opcode_funcUnit_use (data, opcode, idx); |
| 6257 | return use->unit; |
| 6258 | } |
| 6259 | |
| 6260 | |
| 6261 | int |
| 6262 | opcode_funcUnit_use_stage (void *data, xtensa_opcode opcode, int idx) |
| 6263 | { |
| 6264 | xtensa_funcUnit_use *use = xtensa_opcode_funcUnit_use (data, opcode, idx); |
| 6265 | return use->stage; |
| 6266 | } |
| 6267 | |
| 6268 | |
| 6269 | /* Note that this function does not check issue constraints, but |
| 6270 | solely whether the hardware is available to execute the given |
| 6271 | instructions together. It also doesn't check if the tinsns |
| 6272 | write the same state, or access the same tieports. That is |
| 6273 | checked by check_t1_t2_reads_and_writes. */ |
| 6274 | |
| 6275 | static bfd_boolean |
| 6276 | resources_conflict (vliw_insn *vinsn) |
| 6277 | { |
| 6278 | int i; |
| 6279 | static resource_table *rt = NULL; |
| 6280 | |
| 6281 | /* This is the most common case by far. Optimize it. */ |
| 6282 | if (vinsn->num_slots == 1) |
| 6283 | return FALSE; |
| 6284 | |
| 6285 | if (rt == NULL) |
| 6286 | { |
| 6287 | xtensa_isa isa = xtensa_default_isa; |
| 6288 | rt = new_resource_table |
| 6289 | (isa, xtensa_num_pipe_stages, |
| 6290 | xtensa_isa_num_funcUnits (isa), |
| 6291 | (unit_num_copies_func) xtensa_funcUnit_num_copies, |
| 6292 | (opcode_num_units_func) xtensa_opcode_num_funcUnit_uses, |
| 6293 | opcode_funcUnit_use_unit, |
| 6294 | opcode_funcUnit_use_stage); |
| 6295 | } |
| 6296 | |
| 6297 | clear_resource_table (rt); |
| 6298 | |
| 6299 | for (i = 0; i < vinsn->num_slots; i++) |
| 6300 | { |
| 6301 | if (!resources_available (rt, vinsn->slots[i].opcode, 0)) |
| 6302 | return TRUE; |
| 6303 | reserve_resources (rt, vinsn->slots[i].opcode, 0); |
| 6304 | } |
| 6305 | |
| 6306 | return FALSE; |
| 6307 | } |
| 6308 | |
| 6309 | \f |
| 6310 | /* finish_vinsn, emit_single_op and helper functions. */ |
| 6311 | |
| 6312 | static bfd_boolean find_vinsn_conflicts (vliw_insn *); |
| 6313 | static xtensa_format xg_find_narrowest_format (vliw_insn *); |
| 6314 | static void xg_assemble_vliw_tokens (vliw_insn *); |
| 6315 | |
| 6316 | |
| 6317 | /* We have reached the end of a bundle; emit into the frag. */ |
| 6318 | |
| 6319 | static void |
| 6320 | finish_vinsn (vliw_insn *vinsn) |
| 6321 | { |
| 6322 | IStack slotstack; |
| 6323 | int i; |
| 6324 | |
| 6325 | if (find_vinsn_conflicts (vinsn)) |
| 6326 | { |
| 6327 | xg_clear_vinsn (vinsn); |
| 6328 | return; |
| 6329 | } |
| 6330 | |
| 6331 | /* First, find a format that works. */ |
| 6332 | if (vinsn->format == XTENSA_UNDEFINED) |
| 6333 | vinsn->format = xg_find_narrowest_format (vinsn); |
| 6334 | |
| 6335 | if (xtensa_format_num_slots (xtensa_default_isa, vinsn->format) > 1 |
| 6336 | && produce_flix == FLIX_NONE) |
| 6337 | { |
| 6338 | as_bad (_("The option \"--no-allow-flix\" prohibits multi-slot flix.")); |
| 6339 | xg_clear_vinsn (vinsn); |
| 6340 | return; |
| 6341 | } |
| 6342 | |
| 6343 | if (vinsn->format == XTENSA_UNDEFINED) |
| 6344 | { |
| 6345 | as_bad (_("couldn't find a valid instruction format")); |
| 6346 | fprintf (stderr, _(" ops were: ")); |
| 6347 | for (i = 0; i < vinsn->num_slots; i++) |
| 6348 | fprintf (stderr, _(" %s;"), |
| 6349 | xtensa_opcode_name (xtensa_default_isa, |
| 6350 | vinsn->slots[i].opcode)); |
| 6351 | fprintf (stderr, _("\n")); |
| 6352 | xg_clear_vinsn (vinsn); |
| 6353 | return; |
| 6354 | } |
| 6355 | |
| 6356 | if (vinsn->num_slots |
| 6357 | != xtensa_format_num_slots (xtensa_default_isa, vinsn->format)) |
| 6358 | { |
| 6359 | as_bad (_("format '%s' allows %d slots, but there are %d opcodes"), |
| 6360 | xtensa_format_name (xtensa_default_isa, vinsn->format), |
| 6361 | xtensa_format_num_slots (xtensa_default_isa, vinsn->format), |
| 6362 | vinsn->num_slots); |
| 6363 | xg_clear_vinsn (vinsn); |
| 6364 | return; |
| 6365 | } |
| 6366 | |
| 6367 | if (resources_conflict (vinsn)) |
| 6368 | { |
| 6369 | as_bad (_("illegal resource usage in bundle")); |
| 6370 | fprintf (stderr, " ops were: "); |
| 6371 | for (i = 0; i < vinsn->num_slots; i++) |
| 6372 | fprintf (stderr, " %s;", |
| 6373 | xtensa_opcode_name (xtensa_default_isa, |
| 6374 | vinsn->slots[i].opcode)); |
| 6375 | fprintf (stderr, "\n"); |
| 6376 | xg_clear_vinsn (vinsn); |
| 6377 | return; |
| 6378 | } |
| 6379 | |
| 6380 | for (i = 0; i < vinsn->num_slots; i++) |
| 6381 | { |
| 6382 | if (vinsn->slots[i].opcode != XTENSA_UNDEFINED) |
| 6383 | { |
| 6384 | symbolS *lit_sym = NULL; |
| 6385 | int j; |
| 6386 | bfd_boolean e = FALSE; |
| 6387 | bfd_boolean saved_density = density_supported; |
| 6388 | |
| 6389 | /* We don't want to narrow ops inside multi-slot bundles. */ |
| 6390 | if (vinsn->num_slots > 1) |
| 6391 | density_supported = FALSE; |
| 6392 | |
| 6393 | istack_init (&slotstack); |
| 6394 | if (vinsn->slots[i].opcode == xtensa_nop_opcode) |
| 6395 | { |
| 6396 | vinsn->slots[i].opcode = |
| 6397 | xtensa_format_slot_nop_opcode (xtensa_default_isa, |
| 6398 | vinsn->format, i); |
| 6399 | vinsn->slots[i].ntok = 0; |
| 6400 | } |
| 6401 | |
| 6402 | if (xg_expand_assembly_insn (&slotstack, &vinsn->slots[i])) |
| 6403 | { |
| 6404 | e = TRUE; |
| 6405 | continue; |
| 6406 | } |
| 6407 | |
| 6408 | density_supported = saved_density; |
| 6409 | |
| 6410 | if (e) |
| 6411 | { |
| 6412 | xg_clear_vinsn (vinsn); |
| 6413 | return; |
| 6414 | } |
| 6415 | |
| 6416 | for (j = 0; j < slotstack.ninsn; j++) |
| 6417 | { |
| 6418 | TInsn *insn = &slotstack.insn[j]; |
| 6419 | if (insn->insn_type == ITYPE_LITERAL) |
| 6420 | { |
| 6421 | gas_assert (lit_sym == NULL); |
| 6422 | lit_sym = xg_assemble_literal (insn); |
| 6423 | } |
| 6424 | else |
| 6425 | { |
| 6426 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 6427 | if (lit_sym) |
| 6428 | xg_resolve_literals (insn, lit_sym); |
| 6429 | if (j != slotstack.ninsn - 1) |
| 6430 | emit_single_op (insn); |
| 6431 | } |
| 6432 | } |
| 6433 | |
| 6434 | if (vinsn->num_slots > 1) |
| 6435 | { |
| 6436 | if (opcode_fits_format_slot |
| 6437 | (slotstack.insn[slotstack.ninsn - 1].opcode, |
| 6438 | vinsn->format, i)) |
| 6439 | { |
| 6440 | vinsn->slots[i] = slotstack.insn[slotstack.ninsn - 1]; |
| 6441 | } |
| 6442 | else |
| 6443 | { |
| 6444 | emit_single_op (&slotstack.insn[slotstack.ninsn - 1]); |
| 6445 | if (vinsn->format == XTENSA_UNDEFINED) |
| 6446 | vinsn->slots[i].opcode = xtensa_nop_opcode; |
| 6447 | else |
| 6448 | vinsn->slots[i].opcode |
| 6449 | = xtensa_format_slot_nop_opcode (xtensa_default_isa, |
| 6450 | vinsn->format, i); |
| 6451 | |
| 6452 | vinsn->slots[i].ntok = 0; |
| 6453 | } |
| 6454 | } |
| 6455 | else |
| 6456 | { |
| 6457 | vinsn->slots[0] = slotstack.insn[slotstack.ninsn - 1]; |
| 6458 | vinsn->format = XTENSA_UNDEFINED; |
| 6459 | } |
| 6460 | } |
| 6461 | } |
| 6462 | |
| 6463 | /* Now check resource conflicts on the modified bundle. */ |
| 6464 | if (resources_conflict (vinsn)) |
| 6465 | { |
| 6466 | as_bad (_("illegal resource usage in bundle")); |
| 6467 | fprintf (stderr, " ops were: "); |
| 6468 | for (i = 0; i < vinsn->num_slots; i++) |
| 6469 | fprintf (stderr, " %s;", |
| 6470 | xtensa_opcode_name (xtensa_default_isa, |
| 6471 | vinsn->slots[i].opcode)); |
| 6472 | fprintf (stderr, "\n"); |
| 6473 | xg_clear_vinsn (vinsn); |
| 6474 | return; |
| 6475 | } |
| 6476 | |
| 6477 | /* First, find a format that works. */ |
| 6478 | if (vinsn->format == XTENSA_UNDEFINED) |
| 6479 | vinsn->format = xg_find_narrowest_format (vinsn); |
| 6480 | |
| 6481 | xg_assemble_vliw_tokens (vinsn); |
| 6482 | |
| 6483 | xg_clear_vinsn (vinsn); |
| 6484 | |
| 6485 | xtensa_check_frag_count (); |
| 6486 | } |
| 6487 | |
| 6488 | |
| 6489 | /* Given an vliw instruction, what conflicts are there in register |
| 6490 | usage and in writes to states and queues? |
| 6491 | |
| 6492 | This function does two things: |
| 6493 | 1. Reports an error when a vinsn contains illegal combinations |
| 6494 | of writes to registers states or queues. |
| 6495 | 2. Marks individual tinsns as not relaxable if the combination |
| 6496 | contains antidependencies. |
| 6497 | |
| 6498 | Job 2 handles things like swap semantics in instructions that need |
| 6499 | to be relaxed. For example, |
| 6500 | |
| 6501 | addi a0, a1, 100000 |
| 6502 | |
| 6503 | normally would be relaxed to |
| 6504 | |
| 6505 | l32r a0, some_label |
| 6506 | add a0, a1, a0 |
| 6507 | |
| 6508 | _but_, if the above instruction is bundled with an a0 reader, e.g., |
| 6509 | |
| 6510 | { addi a0, a1, 10000 ; add a2, a0, a4 ; } |
| 6511 | |
| 6512 | then we can't relax it into |
| 6513 | |
| 6514 | l32r a0, some_label |
| 6515 | { add a0, a1, a0 ; add a2, a0, a4 ; } |
| 6516 | |
| 6517 | because the value of a0 is trashed before the second add can read it. */ |
| 6518 | |
| 6519 | static char check_t1_t2_reads_and_writes (TInsn *, TInsn *); |
| 6520 | |
| 6521 | static bfd_boolean |
| 6522 | find_vinsn_conflicts (vliw_insn *vinsn) |
| 6523 | { |
| 6524 | int i, j; |
| 6525 | int branches = 0; |
| 6526 | xtensa_isa isa = xtensa_default_isa; |
| 6527 | |
| 6528 | gas_assert (!past_xtensa_end); |
| 6529 | |
| 6530 | for (i = 0 ; i < vinsn->num_slots; i++) |
| 6531 | { |
| 6532 | TInsn *op1 = &vinsn->slots[i]; |
| 6533 | if (op1->is_specific_opcode) |
| 6534 | op1->keep_wide = TRUE; |
| 6535 | else |
| 6536 | op1->keep_wide = FALSE; |
| 6537 | } |
| 6538 | |
| 6539 | for (i = 0 ; i < vinsn->num_slots; i++) |
| 6540 | { |
| 6541 | TInsn *op1 = &vinsn->slots[i]; |
| 6542 | |
| 6543 | if (xtensa_opcode_is_branch (isa, op1->opcode) == 1) |
| 6544 | branches++; |
| 6545 | |
| 6546 | for (j = 0; j < vinsn->num_slots; j++) |
| 6547 | { |
| 6548 | if (i != j) |
| 6549 | { |
| 6550 | TInsn *op2 = &vinsn->slots[j]; |
| 6551 | char conflict_type = check_t1_t2_reads_and_writes (op1, op2); |
| 6552 | switch (conflict_type) |
| 6553 | { |
| 6554 | case 'c': |
| 6555 | as_bad (_("opcodes '%s' (slot %d) and '%s' (slot %d) write the same register"), |
| 6556 | xtensa_opcode_name (isa, op1->opcode), i, |
| 6557 | xtensa_opcode_name (isa, op2->opcode), j); |
| 6558 | return TRUE; |
| 6559 | case 'd': |
| 6560 | as_bad (_("opcodes '%s' (slot %d) and '%s' (slot %d) write the same state"), |
| 6561 | xtensa_opcode_name (isa, op1->opcode), i, |
| 6562 | xtensa_opcode_name (isa, op2->opcode), j); |
| 6563 | return TRUE; |
| 6564 | case 'e': |
| 6565 | as_bad (_("opcodes '%s' (slot %d) and '%s' (slot %d) write the same port"), |
| 6566 | xtensa_opcode_name (isa, op1->opcode), i, |
| 6567 | xtensa_opcode_name (isa, op2->opcode), j); |
| 6568 | return TRUE; |
| 6569 | case 'f': |
| 6570 | as_bad (_("opcodes '%s' (slot %d) and '%s' (slot %d) both have volatile port accesses"), |
| 6571 | xtensa_opcode_name (isa, op1->opcode), i, |
| 6572 | xtensa_opcode_name (isa, op2->opcode), j); |
| 6573 | return TRUE; |
| 6574 | default: |
| 6575 | /* Everything is OK. */ |
| 6576 | break; |
| 6577 | } |
| 6578 | op2->is_specific_opcode = (op2->is_specific_opcode |
| 6579 | || conflict_type == 'a'); |
| 6580 | } |
| 6581 | } |
| 6582 | } |
| 6583 | |
| 6584 | if (branches > 1) |
| 6585 | { |
| 6586 | as_bad (_("multiple branches or jumps in the same bundle")); |
| 6587 | return TRUE; |
| 6588 | } |
| 6589 | |
| 6590 | return FALSE; |
| 6591 | } |
| 6592 | |
| 6593 | |
| 6594 | /* Check how the state used by t1 and t2 relate. |
| 6595 | Cases found are: |
| 6596 | |
| 6597 | case A: t1 reads a register t2 writes (an antidependency within a bundle) |
| 6598 | case B: no relationship between what is read and written (both could |
| 6599 | read the same reg though) |
| 6600 | case C: t1 writes a register t2 writes (a register conflict within a |
| 6601 | bundle) |
| 6602 | case D: t1 writes a state that t2 also writes |
| 6603 | case E: t1 writes a tie queue that t2 also writes |
| 6604 | case F: two volatile queue accesses |
| 6605 | */ |
| 6606 | |
| 6607 | static char |
| 6608 | check_t1_t2_reads_and_writes (TInsn *t1, TInsn *t2) |
| 6609 | { |
| 6610 | xtensa_isa isa = xtensa_default_isa; |
| 6611 | xtensa_regfile t1_regfile, t2_regfile; |
| 6612 | int t1_reg, t2_reg; |
| 6613 | int t1_base_reg, t1_last_reg; |
| 6614 | int t2_base_reg, t2_last_reg; |
| 6615 | char t1_inout, t2_inout; |
| 6616 | int i, j; |
| 6617 | char conflict = 'b'; |
| 6618 | int t1_states; |
| 6619 | int t2_states; |
| 6620 | int t1_interfaces; |
| 6621 | int t2_interfaces; |
| 6622 | bfd_boolean t1_volatile = FALSE; |
| 6623 | bfd_boolean t2_volatile = FALSE; |
| 6624 | |
| 6625 | /* Check registers. */ |
| 6626 | for (j = 0; j < t2->ntok; j++) |
| 6627 | { |
| 6628 | if (xtensa_operand_is_register (isa, t2->opcode, j) != 1) |
| 6629 | continue; |
| 6630 | |
| 6631 | t2_regfile = xtensa_operand_regfile (isa, t2->opcode, j); |
| 6632 | t2_base_reg = t2->tok[j].X_add_number; |
| 6633 | t2_last_reg = t2_base_reg + xtensa_operand_num_regs (isa, t2->opcode, j); |
| 6634 | |
| 6635 | for (i = 0; i < t1->ntok; i++) |
| 6636 | { |
| 6637 | if (xtensa_operand_is_register (isa, t1->opcode, i) != 1) |
| 6638 | continue; |
| 6639 | |
| 6640 | t1_regfile = xtensa_operand_regfile (isa, t1->opcode, i); |
| 6641 | |
| 6642 | if (t1_regfile != t2_regfile) |
| 6643 | continue; |
| 6644 | |
| 6645 | t1_inout = xtensa_operand_inout (isa, t1->opcode, i); |
| 6646 | t2_inout = xtensa_operand_inout (isa, t2->opcode, j); |
| 6647 | |
| 6648 | if (xtensa_operand_is_known_reg (isa, t1->opcode, i) == 0 |
| 6649 | || xtensa_operand_is_known_reg (isa, t2->opcode, j) == 0) |
| 6650 | { |
| 6651 | if (t1_inout == 'm' || t1_inout == 'o' |
| 6652 | || t2_inout == 'm' || t2_inout == 'o') |
| 6653 | { |
| 6654 | conflict = 'a'; |
| 6655 | continue; |
| 6656 | } |
| 6657 | } |
| 6658 | |
| 6659 | t1_base_reg = t1->tok[i].X_add_number; |
| 6660 | t1_last_reg = (t1_base_reg |
| 6661 | + xtensa_operand_num_regs (isa, t1->opcode, i)); |
| 6662 | |
| 6663 | for (t1_reg = t1_base_reg; t1_reg < t1_last_reg; t1_reg++) |
| 6664 | { |
| 6665 | for (t2_reg = t2_base_reg; t2_reg < t2_last_reg; t2_reg++) |
| 6666 | { |
| 6667 | if (t1_reg != t2_reg) |
| 6668 | continue; |
| 6669 | |
| 6670 | if (t2_inout == 'i' && (t1_inout == 'm' || t1_inout == 'o')) |
| 6671 | { |
| 6672 | conflict = 'a'; |
| 6673 | continue; |
| 6674 | } |
| 6675 | |
| 6676 | if (t1_inout == 'i' && (t2_inout == 'm' || t2_inout == 'o')) |
| 6677 | { |
| 6678 | conflict = 'a'; |
| 6679 | continue; |
| 6680 | } |
| 6681 | |
| 6682 | if (t1_inout != 'i' && t2_inout != 'i') |
| 6683 | return 'c'; |
| 6684 | } |
| 6685 | } |
| 6686 | } |
| 6687 | } |
| 6688 | |
| 6689 | /* Check states. */ |
| 6690 | t1_states = xtensa_opcode_num_stateOperands (isa, t1->opcode); |
| 6691 | t2_states = xtensa_opcode_num_stateOperands (isa, t2->opcode); |
| 6692 | for (j = 0; j < t2_states; j++) |
| 6693 | { |
| 6694 | xtensa_state t2_so = xtensa_stateOperand_state (isa, t2->opcode, j); |
| 6695 | t2_inout = xtensa_stateOperand_inout (isa, t2->opcode, j); |
| 6696 | for (i = 0; i < t1_states; i++) |
| 6697 | { |
| 6698 | xtensa_state t1_so = xtensa_stateOperand_state (isa, t1->opcode, i); |
| 6699 | t1_inout = xtensa_stateOperand_inout (isa, t1->opcode, i); |
| 6700 | if (t1_so != t2_so || xtensa_state_is_shared_or (isa, t1_so) == 1) |
| 6701 | continue; |
| 6702 | |
| 6703 | if (t2_inout == 'i' && (t1_inout == 'm' || t1_inout == 'o')) |
| 6704 | { |
| 6705 | conflict = 'a'; |
| 6706 | continue; |
| 6707 | } |
| 6708 | |
| 6709 | if (t1_inout == 'i' && (t2_inout == 'm' || t2_inout == 'o')) |
| 6710 | { |
| 6711 | conflict = 'a'; |
| 6712 | continue; |
| 6713 | } |
| 6714 | |
| 6715 | if (t1_inout != 'i' && t2_inout != 'i') |
| 6716 | return 'd'; |
| 6717 | } |
| 6718 | } |
| 6719 | |
| 6720 | /* Check tieports. */ |
| 6721 | t1_interfaces = xtensa_opcode_num_interfaceOperands (isa, t1->opcode); |
| 6722 | t2_interfaces = xtensa_opcode_num_interfaceOperands (isa, t2->opcode); |
| 6723 | for (j = 0; j < t2_interfaces; j++) |
| 6724 | { |
| 6725 | xtensa_interface t2_int |
| 6726 | = xtensa_interfaceOperand_interface (isa, t2->opcode, j); |
| 6727 | int t2_class = xtensa_interface_class_id (isa, t2_int); |
| 6728 | |
| 6729 | t2_inout = xtensa_interface_inout (isa, t2_int); |
| 6730 | if (xtensa_interface_has_side_effect (isa, t2_int) == 1) |
| 6731 | t2_volatile = TRUE; |
| 6732 | |
| 6733 | for (i = 0; i < t1_interfaces; i++) |
| 6734 | { |
| 6735 | xtensa_interface t1_int |
| 6736 | = xtensa_interfaceOperand_interface (isa, t1->opcode, j); |
| 6737 | int t1_class = xtensa_interface_class_id (isa, t1_int); |
| 6738 | |
| 6739 | t1_inout = xtensa_interface_inout (isa, t1_int); |
| 6740 | if (xtensa_interface_has_side_effect (isa, t1_int) == 1) |
| 6741 | t1_volatile = TRUE; |
| 6742 | |
| 6743 | if (t1_volatile && t2_volatile && (t1_class == t2_class)) |
| 6744 | return 'f'; |
| 6745 | |
| 6746 | if (t1_int != t2_int) |
| 6747 | continue; |
| 6748 | |
| 6749 | if (t2_inout == 'i' && t1_inout == 'o') |
| 6750 | { |
| 6751 | conflict = 'a'; |
| 6752 | continue; |
| 6753 | } |
| 6754 | |
| 6755 | if (t1_inout == 'i' && t2_inout == 'o') |
| 6756 | { |
| 6757 | conflict = 'a'; |
| 6758 | continue; |
| 6759 | } |
| 6760 | |
| 6761 | if (t1_inout != 'i' && t2_inout != 'i') |
| 6762 | return 'e'; |
| 6763 | } |
| 6764 | } |
| 6765 | |
| 6766 | return conflict; |
| 6767 | } |
| 6768 | |
| 6769 | |
| 6770 | static xtensa_format |
| 6771 | xg_find_narrowest_format (vliw_insn *vinsn) |
| 6772 | { |
| 6773 | /* Right now we assume that the ops within the vinsn are properly |
| 6774 | ordered for the slots that the programmer wanted them in. In |
| 6775 | other words, we don't rearrange the ops in hopes of finding a |
| 6776 | better format. The scheduler handles that. */ |
| 6777 | |
| 6778 | xtensa_isa isa = xtensa_default_isa; |
| 6779 | xtensa_format format; |
| 6780 | xtensa_opcode nop_opcode = xtensa_nop_opcode; |
| 6781 | |
| 6782 | if (vinsn->num_slots == 1) |
| 6783 | return xg_get_single_format (vinsn->slots[0].opcode); |
| 6784 | |
| 6785 | for (format = 0; format < xtensa_isa_num_formats (isa); format++) |
| 6786 | { |
| 6787 | vliw_insn v_copy; |
| 6788 | xg_copy_vinsn (&v_copy, vinsn); |
| 6789 | if (xtensa_format_num_slots (isa, format) == v_copy.num_slots) |
| 6790 | { |
| 6791 | int slot; |
| 6792 | int fit = 0; |
| 6793 | for (slot = 0; slot < v_copy.num_slots; slot++) |
| 6794 | { |
| 6795 | if (v_copy.slots[slot].opcode == nop_opcode) |
| 6796 | { |
| 6797 | v_copy.slots[slot].opcode = |
| 6798 | xtensa_format_slot_nop_opcode (isa, format, slot); |
| 6799 | v_copy.slots[slot].ntok = 0; |
| 6800 | } |
| 6801 | |
| 6802 | if (opcode_fits_format_slot (v_copy.slots[slot].opcode, |
| 6803 | format, slot)) |
| 6804 | fit++; |
| 6805 | else if (v_copy.num_slots > 1) |
| 6806 | { |
| 6807 | TInsn widened; |
| 6808 | /* Try the widened version. */ |
| 6809 | if (!v_copy.slots[slot].keep_wide |
| 6810 | && !v_copy.slots[slot].is_specific_opcode |
| 6811 | && xg_is_single_relaxable_insn (&v_copy.slots[slot], |
| 6812 | &widened, TRUE) |
| 6813 | && opcode_fits_format_slot (widened.opcode, |
| 6814 | format, slot)) |
| 6815 | { |
| 6816 | v_copy.slots[slot] = widened; |
| 6817 | fit++; |
| 6818 | } |
| 6819 | } |
| 6820 | } |
| 6821 | if (fit == v_copy.num_slots) |
| 6822 | { |
| 6823 | xg_copy_vinsn (vinsn, &v_copy); |
| 6824 | xtensa_format_encode (isa, format, vinsn->insnbuf); |
| 6825 | vinsn->format = format; |
| 6826 | break; |
| 6827 | } |
| 6828 | } |
| 6829 | } |
| 6830 | |
| 6831 | if (format == xtensa_isa_num_formats (isa)) |
| 6832 | return XTENSA_UNDEFINED; |
| 6833 | |
| 6834 | return format; |
| 6835 | } |
| 6836 | |
| 6837 | |
| 6838 | /* Return the additional space needed in a frag |
| 6839 | for possible relaxations of any ops in a VLIW insn. |
| 6840 | Also fill out the relaxations that might be required of |
| 6841 | each tinsn in the vinsn. */ |
| 6842 | |
| 6843 | static int |
| 6844 | relaxation_requirements (vliw_insn *vinsn, bfd_boolean *pfinish_frag) |
| 6845 | { |
| 6846 | bfd_boolean finish_frag = FALSE; |
| 6847 | int extra_space = 0; |
| 6848 | int slot; |
| 6849 | |
| 6850 | for (slot = 0; slot < vinsn->num_slots; slot++) |
| 6851 | { |
| 6852 | TInsn *tinsn = &vinsn->slots[slot]; |
| 6853 | if (!tinsn_has_symbolic_operands (tinsn)) |
| 6854 | { |
| 6855 | /* A narrow instruction could be widened later to help |
| 6856 | alignment issues. */ |
| 6857 | if (xg_is_single_relaxable_insn (tinsn, 0, TRUE) |
| 6858 | && !tinsn->is_specific_opcode |
| 6859 | && vinsn->num_slots == 1) |
| 6860 | { |
| 6861 | /* Difference in bytes between narrow and wide insns... */ |
| 6862 | extra_space += 1; |
| 6863 | tinsn->subtype = RELAX_NARROW; |
| 6864 | } |
| 6865 | } |
| 6866 | else |
| 6867 | { |
| 6868 | if (workaround_b_j_loop_end |
| 6869 | && tinsn->opcode == xtensa_jx_opcode |
| 6870 | && use_transform ()) |
| 6871 | { |
| 6872 | /* Add 2 of these. */ |
| 6873 | extra_space += 3; /* for the nop size */ |
| 6874 | tinsn->subtype = RELAX_ADD_NOP_IF_PRE_LOOP_END; |
| 6875 | } |
| 6876 | |
| 6877 | /* Need to assemble it with space for the relocation. */ |
| 6878 | if (xg_is_relaxable_insn (tinsn, 0) |
| 6879 | && !tinsn->is_specific_opcode) |
| 6880 | { |
| 6881 | int max_size = xg_get_max_insn_widen_size (tinsn->opcode); |
| 6882 | int max_literal_size = |
| 6883 | xg_get_max_insn_widen_literal_size (tinsn->opcode); |
| 6884 | |
| 6885 | tinsn->literal_space = max_literal_size; |
| 6886 | |
| 6887 | tinsn->subtype = RELAX_IMMED; |
| 6888 | extra_space += max_size; |
| 6889 | } |
| 6890 | else |
| 6891 | { |
| 6892 | /* A fix record will be added for this instruction prior |
| 6893 | to relaxation, so make it end the frag. */ |
| 6894 | finish_frag = TRUE; |
| 6895 | } |
| 6896 | } |
| 6897 | } |
| 6898 | *pfinish_frag = finish_frag; |
| 6899 | return extra_space; |
| 6900 | } |
| 6901 | |
| 6902 | |
| 6903 | static void |
| 6904 | bundle_tinsn (TInsn *tinsn, vliw_insn *vinsn) |
| 6905 | { |
| 6906 | xtensa_isa isa = xtensa_default_isa; |
| 6907 | int slot, chosen_slot; |
| 6908 | |
| 6909 | vinsn->format = xg_get_single_format (tinsn->opcode); |
| 6910 | gas_assert (vinsn->format != XTENSA_UNDEFINED); |
| 6911 | vinsn->num_slots = xtensa_format_num_slots (isa, vinsn->format); |
| 6912 | |
| 6913 | chosen_slot = xg_get_single_slot (tinsn->opcode); |
| 6914 | for (slot = 0; slot < vinsn->num_slots; slot++) |
| 6915 | { |
| 6916 | if (slot == chosen_slot) |
| 6917 | vinsn->slots[slot] = *tinsn; |
| 6918 | else |
| 6919 | { |
| 6920 | vinsn->slots[slot].opcode = |
| 6921 | xtensa_format_slot_nop_opcode (isa, vinsn->format, slot); |
| 6922 | vinsn->slots[slot].ntok = 0; |
| 6923 | vinsn->slots[slot].insn_type = ITYPE_INSN; |
| 6924 | } |
| 6925 | } |
| 6926 | } |
| 6927 | |
| 6928 | |
| 6929 | static bfd_boolean |
| 6930 | emit_single_op (TInsn *orig_insn) |
| 6931 | { |
| 6932 | int i; |
| 6933 | IStack istack; /* put instructions into here */ |
| 6934 | symbolS *lit_sym = NULL; |
| 6935 | symbolS *label_sym = NULL; |
| 6936 | |
| 6937 | istack_init (&istack); |
| 6938 | |
| 6939 | /* Special-case for "movi aX, foo" which is guaranteed to need relaxing. |
| 6940 | Because the scheduling and bundling characteristics of movi and |
| 6941 | l32r or const16 are so different, we can do much better if we relax |
| 6942 | it prior to scheduling and bundling, rather than after. */ |
| 6943 | if ((orig_insn->opcode == xtensa_movi_opcode |
| 6944 | || orig_insn->opcode == xtensa_movi_n_opcode) |
| 6945 | && !cur_vinsn.inside_bundle |
| 6946 | && (orig_insn->tok[1].X_op == O_symbol |
| 6947 | || orig_insn->tok[1].X_op == O_pltrel |
| 6948 | || orig_insn->tok[1].X_op == O_tlsfunc |
| 6949 | || orig_insn->tok[1].X_op == O_tlsarg |
| 6950 | || orig_insn->tok[1].X_op == O_tpoff |
| 6951 | || orig_insn->tok[1].X_op == O_dtpoff) |
| 6952 | && !orig_insn->is_specific_opcode && use_transform ()) |
| 6953 | xg_assembly_relax (&istack, orig_insn, now_seg, frag_now, 0, 1, 0); |
| 6954 | else |
| 6955 | if (xg_expand_assembly_insn (&istack, orig_insn)) |
| 6956 | return TRUE; |
| 6957 | |
| 6958 | for (i = 0; i < istack.ninsn; i++) |
| 6959 | { |
| 6960 | TInsn *insn = &istack.insn[i]; |
| 6961 | switch (insn->insn_type) |
| 6962 | { |
| 6963 | case ITYPE_LITERAL: |
| 6964 | gas_assert (lit_sym == NULL); |
| 6965 | lit_sym = xg_assemble_literal (insn); |
| 6966 | break; |
| 6967 | case ITYPE_LABEL: |
| 6968 | { |
| 6969 | static int relaxed_sym_idx = 0; |
| 6970 | char *label = xmalloc (strlen (FAKE_LABEL_NAME) + 12); |
| 6971 | sprintf (label, "%s_rl_%x", FAKE_LABEL_NAME, relaxed_sym_idx++); |
| 6972 | colon (label); |
| 6973 | gas_assert (label_sym == NULL); |
| 6974 | label_sym = symbol_find_or_make (label); |
| 6975 | gas_assert (label_sym); |
| 6976 | free (label); |
| 6977 | } |
| 6978 | break; |
| 6979 | case ITYPE_INSN: |
| 6980 | { |
| 6981 | vliw_insn v; |
| 6982 | if (lit_sym) |
| 6983 | xg_resolve_literals (insn, lit_sym); |
| 6984 | if (label_sym) |
| 6985 | xg_resolve_labels (insn, label_sym); |
| 6986 | xg_init_vinsn (&v); |
| 6987 | bundle_tinsn (insn, &v); |
| 6988 | finish_vinsn (&v); |
| 6989 | xg_free_vinsn (&v); |
| 6990 | } |
| 6991 | break; |
| 6992 | default: |
| 6993 | gas_assert (0); |
| 6994 | break; |
| 6995 | } |
| 6996 | } |
| 6997 | return FALSE; |
| 6998 | } |
| 6999 | |
| 7000 | |
| 7001 | static int |
| 7002 | total_frag_text_expansion (fragS *fragP) |
| 7003 | { |
| 7004 | int slot; |
| 7005 | int total_expansion = 0; |
| 7006 | |
| 7007 | for (slot = 0; slot < config_max_slots; slot++) |
| 7008 | total_expansion += fragP->tc_frag_data.text_expansion[slot]; |
| 7009 | |
| 7010 | return total_expansion; |
| 7011 | } |
| 7012 | |
| 7013 | |
| 7014 | /* Emit a vliw instruction to the current fragment. */ |
| 7015 | |
| 7016 | static void |
| 7017 | xg_assemble_vliw_tokens (vliw_insn *vinsn) |
| 7018 | { |
| 7019 | bfd_boolean finish_frag; |
| 7020 | bfd_boolean is_jump = FALSE; |
| 7021 | bfd_boolean is_branch = FALSE; |
| 7022 | xtensa_isa isa = xtensa_default_isa; |
| 7023 | int insn_size; |
| 7024 | int extra_space; |
| 7025 | char *f = NULL; |
| 7026 | int slot; |
| 7027 | struct dwarf2_line_info debug_line; |
| 7028 | bfd_boolean loc_directive_seen = FALSE; |
| 7029 | TInsn *tinsn; |
| 7030 | |
| 7031 | memset (&debug_line, 0, sizeof (struct dwarf2_line_info)); |
| 7032 | |
| 7033 | if (generating_literals) |
| 7034 | { |
| 7035 | static int reported = 0; |
| 7036 | if (reported < 4) |
| 7037 | as_bad_where (frag_now->fr_file, frag_now->fr_line, |
| 7038 | _("cannot assemble into a literal fragment")); |
| 7039 | if (reported == 3) |
| 7040 | as_bad (_("...")); |
| 7041 | reported++; |
| 7042 | return; |
| 7043 | } |
| 7044 | |
| 7045 | if (frag_now_fix () != 0 |
| 7046 | && (! frag_now->tc_frag_data.is_insn |
| 7047 | || (vinsn_has_specific_opcodes (vinsn) && use_transform ()) |
| 7048 | || (!use_transform ()) != frag_now->tc_frag_data.is_no_transform |
| 7049 | || (directive_state[directive_longcalls] |
| 7050 | != frag_now->tc_frag_data.use_longcalls) |
| 7051 | || (directive_state[directive_absolute_literals] |
| 7052 | != frag_now->tc_frag_data.use_absolute_literals))) |
| 7053 | { |
| 7054 | frag_wane (frag_now); |
| 7055 | frag_new (0); |
| 7056 | xtensa_set_frag_assembly_state (frag_now); |
| 7057 | } |
| 7058 | |
| 7059 | if (workaround_a0_b_retw |
| 7060 | && vinsn->num_slots == 1 |
| 7061 | && (get_last_insn_flags (now_seg, now_subseg) & FLAG_IS_A0_WRITER) != 0 |
| 7062 | && xtensa_opcode_is_branch (isa, vinsn->slots[0].opcode) == 1 |
| 7063 | && use_transform ()) |
| 7064 | { |
| 7065 | has_a0_b_retw = TRUE; |
| 7066 | |
| 7067 | /* Mark this fragment with the special RELAX_ADD_NOP_IF_A0_B_RETW. |
| 7068 | After the first assembly pass we will check all of them and |
| 7069 | add a nop if needed. */ |
| 7070 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7071 | frag_var (rs_machine_dependent, 4, 4, |
| 7072 | RELAX_ADD_NOP_IF_A0_B_RETW, |
| 7073 | frag_now->fr_symbol, |
| 7074 | frag_now->fr_offset, |
| 7075 | NULL); |
| 7076 | xtensa_set_frag_assembly_state (frag_now); |
| 7077 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7078 | frag_var (rs_machine_dependent, 4, 4, |
| 7079 | RELAX_ADD_NOP_IF_A0_B_RETW, |
| 7080 | frag_now->fr_symbol, |
| 7081 | frag_now->fr_offset, |
| 7082 | NULL); |
| 7083 | xtensa_set_frag_assembly_state (frag_now); |
| 7084 | } |
| 7085 | |
| 7086 | for (slot = 0; slot < vinsn->num_slots; slot++) |
| 7087 | { |
| 7088 | tinsn = &vinsn->slots[slot]; |
| 7089 | |
| 7090 | /* See if the instruction implies an aligned section. */ |
| 7091 | if (xtensa_opcode_is_loop (isa, tinsn->opcode) == 1) |
| 7092 | record_alignment (now_seg, 2); |
| 7093 | |
| 7094 | /* Determine the best line number for debug info. */ |
| 7095 | if ((tinsn->loc_directive_seen || !loc_directive_seen) |
| 7096 | && (tinsn->debug_line.filenum != debug_line.filenum |
| 7097 | || tinsn->debug_line.line < debug_line.line |
| 7098 | || tinsn->debug_line.column < debug_line.column)) |
| 7099 | debug_line = tinsn->debug_line; |
| 7100 | if (tinsn->loc_directive_seen) |
| 7101 | loc_directive_seen = TRUE; |
| 7102 | } |
| 7103 | |
| 7104 | /* Special cases for instructions that force an alignment... */ |
| 7105 | /* None of these opcodes are bundle-able. */ |
| 7106 | if (xtensa_opcode_is_loop (isa, vinsn->slots[0].opcode) == 1) |
| 7107 | { |
| 7108 | int max_fill; |
| 7109 | |
| 7110 | /* Remember the symbol that marks the end of the loop in the frag |
| 7111 | that marks the start of the loop. This way we can easily find |
| 7112 | the end of the loop at the beginning, without adding special code |
| 7113 | to mark the loop instructions themselves. */ |
| 7114 | symbolS *target_sym = NULL; |
| 7115 | if (vinsn->slots[0].tok[1].X_op == O_symbol) |
| 7116 | target_sym = vinsn->slots[0].tok[1].X_add_symbol; |
| 7117 | |
| 7118 | xtensa_set_frag_assembly_state (frag_now); |
| 7119 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7120 | |
| 7121 | max_fill = get_text_align_max_fill_size |
| 7122 | (get_text_align_power (xtensa_fetch_width), |
| 7123 | TRUE, frag_now->tc_frag_data.is_no_density); |
| 7124 | |
| 7125 | if (use_transform ()) |
| 7126 | frag_var (rs_machine_dependent, max_fill, max_fill, |
| 7127 | RELAX_ALIGN_NEXT_OPCODE, target_sym, 0, NULL); |
| 7128 | else |
| 7129 | frag_var (rs_machine_dependent, 0, 0, |
| 7130 | RELAX_CHECK_ALIGN_NEXT_OPCODE, target_sym, 0, NULL); |
| 7131 | xtensa_set_frag_assembly_state (frag_now); |
| 7132 | } |
| 7133 | |
| 7134 | if (vinsn->slots[0].opcode == xtensa_entry_opcode |
| 7135 | && !vinsn->slots[0].is_specific_opcode) |
| 7136 | { |
| 7137 | xtensa_mark_literal_pool_location (); |
| 7138 | xtensa_move_labels (frag_now, 0); |
| 7139 | frag_var (rs_align_test, 1, 1, 0, NULL, 2, NULL); |
| 7140 | } |
| 7141 | |
| 7142 | if (vinsn->num_slots == 1) |
| 7143 | { |
| 7144 | if (workaround_a0_b_retw && use_transform ()) |
| 7145 | set_last_insn_flags (now_seg, now_subseg, FLAG_IS_A0_WRITER, |
| 7146 | is_register_writer (&vinsn->slots[0], "a", 0)); |
| 7147 | |
| 7148 | set_last_insn_flags (now_seg, now_subseg, FLAG_IS_BAD_LOOPEND, |
| 7149 | is_bad_loopend_opcode (&vinsn->slots[0])); |
| 7150 | } |
| 7151 | else |
| 7152 | set_last_insn_flags (now_seg, now_subseg, FLAG_IS_BAD_LOOPEND, FALSE); |
| 7153 | |
| 7154 | insn_size = xtensa_format_length (isa, vinsn->format); |
| 7155 | |
| 7156 | extra_space = relaxation_requirements (vinsn, &finish_frag); |
| 7157 | |
| 7158 | /* vinsn_to_insnbuf will produce the error. */ |
| 7159 | if (vinsn->format != XTENSA_UNDEFINED) |
| 7160 | { |
| 7161 | f = frag_more (insn_size + extra_space); |
| 7162 | xtensa_set_frag_assembly_state (frag_now); |
| 7163 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7164 | } |
| 7165 | |
| 7166 | vinsn_to_insnbuf (vinsn, f, frag_now, FALSE); |
| 7167 | if (vinsn->format == XTENSA_UNDEFINED) |
| 7168 | return; |
| 7169 | |
| 7170 | xtensa_insnbuf_to_chars (isa, vinsn->insnbuf, (unsigned char *) f, 0); |
| 7171 | |
| 7172 | if (debug_type == DEBUG_DWARF2 || loc_directive_seen) |
| 7173 | dwarf2_gen_line_info (frag_now_fix () - (insn_size + extra_space), |
| 7174 | &debug_line); |
| 7175 | |
| 7176 | for (slot = 0; slot < vinsn->num_slots; slot++) |
| 7177 | { |
| 7178 | tinsn = &vinsn->slots[slot]; |
| 7179 | frag_now->tc_frag_data.slot_subtypes[slot] = tinsn->subtype; |
| 7180 | frag_now->tc_frag_data.slot_symbols[slot] = tinsn->symbol; |
| 7181 | frag_now->tc_frag_data.slot_offsets[slot] = tinsn->offset; |
| 7182 | frag_now->tc_frag_data.literal_frags[slot] = tinsn->literal_frag; |
| 7183 | if (tinsn->opcode == xtensa_l32r_opcode) |
| 7184 | { |
| 7185 | frag_now->tc_frag_data.literal_frags[slot] = |
| 7186 | tinsn->tok[1].X_add_symbol->sy_frag; |
| 7187 | } |
| 7188 | if (tinsn->literal_space != 0) |
| 7189 | xg_assemble_literal_space (tinsn->literal_space, slot); |
| 7190 | frag_now->tc_frag_data.free_reg[slot] = tinsn->extra_arg; |
| 7191 | |
| 7192 | if (tinsn->subtype == RELAX_NARROW) |
| 7193 | gas_assert (vinsn->num_slots == 1); |
| 7194 | if (xtensa_opcode_is_jump (isa, tinsn->opcode) == 1) |
| 7195 | is_jump = TRUE; |
| 7196 | if (xtensa_opcode_is_branch (isa, tinsn->opcode) == 1) |
| 7197 | is_branch = TRUE; |
| 7198 | |
| 7199 | if (tinsn->subtype || tinsn->symbol || tinsn->offset |
| 7200 | || tinsn->literal_frag || is_jump || is_branch) |
| 7201 | finish_frag = TRUE; |
| 7202 | } |
| 7203 | |
| 7204 | if (vinsn_has_specific_opcodes (vinsn) && use_transform ()) |
| 7205 | frag_now->tc_frag_data.is_specific_opcode = TRUE; |
| 7206 | |
| 7207 | if (finish_frag) |
| 7208 | { |
| 7209 | frag_variant (rs_machine_dependent, |
| 7210 | extra_space, extra_space, RELAX_SLOTS, |
| 7211 | frag_now->fr_symbol, frag_now->fr_offset, f); |
| 7212 | xtensa_set_frag_assembly_state (frag_now); |
| 7213 | } |
| 7214 | |
| 7215 | /* Special cases for loops: |
| 7216 | close_loop_end should be inserted AFTER short_loop. |
| 7217 | Make sure that CLOSE loops are processed BEFORE short_loops |
| 7218 | when converting them. */ |
| 7219 | |
| 7220 | /* "short_loop": Add a NOP if the loop is < 4 bytes. */ |
| 7221 | if (xtensa_opcode_is_loop (isa, vinsn->slots[0].opcode) == 1 |
| 7222 | && !vinsn->slots[0].is_specific_opcode) |
| 7223 | { |
| 7224 | if (workaround_short_loop && use_transform ()) |
| 7225 | { |
| 7226 | maybe_has_short_loop = TRUE; |
| 7227 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7228 | frag_var (rs_machine_dependent, 4, 4, |
| 7229 | RELAX_ADD_NOP_IF_SHORT_LOOP, |
| 7230 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7231 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7232 | frag_var (rs_machine_dependent, 4, 4, |
| 7233 | RELAX_ADD_NOP_IF_SHORT_LOOP, |
| 7234 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7235 | } |
| 7236 | |
| 7237 | /* "close_loop_end": Add up to 12 bytes of NOPs to keep a |
| 7238 | loop at least 12 bytes away from another loop's end. */ |
| 7239 | if (workaround_close_loop_end && use_transform ()) |
| 7240 | { |
| 7241 | maybe_has_close_loop_end = TRUE; |
| 7242 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7243 | frag_var (rs_machine_dependent, 12, 12, |
| 7244 | RELAX_ADD_NOP_IF_CLOSE_LOOP_END, |
| 7245 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7246 | } |
| 7247 | } |
| 7248 | |
| 7249 | if (use_transform ()) |
| 7250 | { |
| 7251 | if (is_jump) |
| 7252 | { |
| 7253 | gas_assert (finish_frag); |
| 7254 | frag_var (rs_machine_dependent, |
| 7255 | xtensa_fetch_width, xtensa_fetch_width, |
| 7256 | RELAX_UNREACHABLE, |
| 7257 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7258 | xtensa_set_frag_assembly_state (frag_now); |
| 7259 | xtensa_maybe_create_trampoline_frag (); |
| 7260 | /* Always create one here. */ |
| 7261 | xtensa_maybe_create_literal_pool_frag (TRUE, FALSE); |
| 7262 | } |
| 7263 | else if (is_branch && do_align_targets ()) |
| 7264 | { |
| 7265 | gas_assert (finish_frag); |
| 7266 | frag_var (rs_machine_dependent, |
| 7267 | xtensa_fetch_width, xtensa_fetch_width, |
| 7268 | RELAX_MAYBE_UNREACHABLE, |
| 7269 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7270 | xtensa_set_frag_assembly_state (frag_now); |
| 7271 | frag_var (rs_machine_dependent, |
| 7272 | 0, 0, |
| 7273 | RELAX_MAYBE_DESIRE_ALIGN, |
| 7274 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7275 | xtensa_set_frag_assembly_state (frag_now); |
| 7276 | } |
| 7277 | } |
| 7278 | |
| 7279 | /* Now, if the original opcode was a call... */ |
| 7280 | if (do_align_targets () |
| 7281 | && xtensa_opcode_is_call (isa, vinsn->slots[0].opcode) == 1) |
| 7282 | { |
| 7283 | float freq = get_subseg_total_freq (now_seg, now_subseg); |
| 7284 | frag_now->tc_frag_data.is_insn = TRUE; |
| 7285 | frag_var (rs_machine_dependent, 4, (int) freq, RELAX_DESIRE_ALIGN, |
| 7286 | frag_now->fr_symbol, frag_now->fr_offset, NULL); |
| 7287 | xtensa_set_frag_assembly_state (frag_now); |
| 7288 | } |
| 7289 | |
| 7290 | if (vinsn_has_specific_opcodes (vinsn) && use_transform ()) |
| 7291 | { |
| 7292 | frag_wane (frag_now); |
| 7293 | frag_new (0); |
| 7294 | xtensa_set_frag_assembly_state (frag_now); |
| 7295 | } |
| 7296 | } |
| 7297 | |
| 7298 | \f |
| 7299 | /* xtensa_end and helper functions. */ |
| 7300 | |
| 7301 | static void xtensa_cleanup_align_frags (void); |
| 7302 | static void xtensa_fix_target_frags (void); |
| 7303 | static void xtensa_mark_narrow_branches (void); |
| 7304 | static void xtensa_mark_zcl_first_insns (void); |
| 7305 | static void xtensa_mark_difference_of_two_symbols (void); |
| 7306 | static void xtensa_fix_a0_b_retw_frags (void); |
| 7307 | static void xtensa_fix_b_j_loop_end_frags (void); |
| 7308 | static void xtensa_fix_close_loop_end_frags (void); |
| 7309 | static void xtensa_fix_short_loop_frags (void); |
| 7310 | static void xtensa_sanity_check (void); |
| 7311 | static void xtensa_add_config_info (void); |
| 7312 | |
| 7313 | void |
| 7314 | xtensa_end (void) |
| 7315 | { |
| 7316 | directive_balance (); |
| 7317 | xtensa_flush_pending_output (); |
| 7318 | |
| 7319 | past_xtensa_end = TRUE; |
| 7320 | |
| 7321 | xtensa_move_literals (); |
| 7322 | |
| 7323 | xtensa_reorder_segments (); |
| 7324 | xtensa_cleanup_align_frags (); |
| 7325 | xtensa_fix_target_frags (); |
| 7326 | if (workaround_a0_b_retw && has_a0_b_retw) |
| 7327 | xtensa_fix_a0_b_retw_frags (); |
| 7328 | if (workaround_b_j_loop_end) |
| 7329 | xtensa_fix_b_j_loop_end_frags (); |
| 7330 | |
| 7331 | /* "close_loop_end" should be processed BEFORE "short_loop". */ |
| 7332 | if (workaround_close_loop_end && maybe_has_close_loop_end) |
| 7333 | xtensa_fix_close_loop_end_frags (); |
| 7334 | |
| 7335 | if (workaround_short_loop && maybe_has_short_loop) |
| 7336 | xtensa_fix_short_loop_frags (); |
| 7337 | if (align_targets) |
| 7338 | xtensa_mark_narrow_branches (); |
| 7339 | xtensa_mark_zcl_first_insns (); |
| 7340 | |
| 7341 | xtensa_sanity_check (); |
| 7342 | |
| 7343 | xtensa_add_config_info (); |
| 7344 | |
| 7345 | xtensa_check_frag_count (); |
| 7346 | } |
| 7347 | |
| 7348 | |
| 7349 | struct trampoline_frag |
| 7350 | { |
| 7351 | struct trampoline_frag *next; |
| 7352 | bfd_boolean needs_jump_around; |
| 7353 | fragS *fragP; |
| 7354 | fixS *fixP; |
| 7355 | }; |
| 7356 | |
| 7357 | struct trampoline_seg |
| 7358 | { |
| 7359 | struct trampoline_seg *next; |
| 7360 | asection *seg; |
| 7361 | struct trampoline_frag trampoline_list; |
| 7362 | }; |
| 7363 | |
| 7364 | static struct trampoline_seg trampoline_seg_list; |
| 7365 | #define J_RANGE (128 * 1024) |
| 7366 | |
| 7367 | static int unreachable_count = 0; |
| 7368 | |
| 7369 | |
| 7370 | static void |
| 7371 | xtensa_maybe_create_trampoline_frag (void) |
| 7372 | { |
| 7373 | if (!use_trampolines) |
| 7374 | return; |
| 7375 | |
| 7376 | /* We create an area for possible trampolines every 10 unreachable frags. |
| 7377 | These are preferred over the ones not preceded by an unreachable frag, |
| 7378 | because we don't have to jump around them. This function is called after |
| 7379 | each RELAX_UNREACHABLE frag is created. */ |
| 7380 | |
| 7381 | if (++unreachable_count > 10) |
| 7382 | { |
| 7383 | xtensa_create_trampoline_frag (FALSE); |
| 7384 | clear_frag_count (); |
| 7385 | unreachable_count = 0; |
| 7386 | } |
| 7387 | } |
| 7388 | |
| 7389 | static void |
| 7390 | xtensa_check_frag_count (void) |
| 7391 | { |
| 7392 | if (!use_trampolines || frag_now->tc_frag_data.is_no_transform) |
| 7393 | return; |
| 7394 | |
| 7395 | /* We create an area for possible trampolines every 8000 frags or so. This |
| 7396 | is an estimate based on the max range of a "j" insn (+/-128K) divided |
| 7397 | by a typical frag byte count (16), minus a few for safety. This function |
| 7398 | is called after each source line is processed. */ |
| 7399 | |
| 7400 | if (get_frag_count () > 8000) |
| 7401 | { |
| 7402 | xtensa_create_trampoline_frag (TRUE); |
| 7403 | clear_frag_count (); |
| 7404 | unreachable_count = 0; |
| 7405 | } |
| 7406 | |
| 7407 | /* We create an area for a possible literal pool every N (default 5000) |
| 7408 | frags or so. */ |
| 7409 | xtensa_maybe_create_literal_pool_frag (TRUE, TRUE); |
| 7410 | } |
| 7411 | |
| 7412 | static xtensa_insnbuf trampoline_buf = NULL; |
| 7413 | static xtensa_insnbuf trampoline_slotbuf = NULL; |
| 7414 | |
| 7415 | static xtensa_insnbuf litpool_buf = NULL; |
| 7416 | static xtensa_insnbuf litpool_slotbuf = NULL; |
| 7417 | |
| 7418 | #define TRAMPOLINE_FRAG_SIZE 3000 |
| 7419 | |
| 7420 | static void |
| 7421 | xtensa_create_trampoline_frag (bfd_boolean needs_jump_around) |
| 7422 | { |
| 7423 | /* Emit a frag where we can place intermediate jump instructions, |
| 7424 | in case we need to jump farther than 128K bytes. |
| 7425 | Each jump instruction takes three bytes. |
| 7426 | We allocate enough for 1000 trampolines in each frag. |
| 7427 | If that's not enough, oh well. */ |
| 7428 | |
| 7429 | struct trampoline_seg *ts = trampoline_seg_list.next; |
| 7430 | struct trampoline_frag *tf; |
| 7431 | char *varP; |
| 7432 | fragS *fragP; |
| 7433 | int size = TRAMPOLINE_FRAG_SIZE; |
| 7434 | |
| 7435 | for ( ; ts; ts = ts->next) |
| 7436 | { |
| 7437 | if (ts->seg == now_seg) |
| 7438 | break; |
| 7439 | } |
| 7440 | |
| 7441 | if (ts == NULL) |
| 7442 | { |
| 7443 | ts = (struct trampoline_seg *)xcalloc(sizeof (struct trampoline_seg), 1); |
| 7444 | ts->next = trampoline_seg_list.next; |
| 7445 | trampoline_seg_list.next = ts; |
| 7446 | ts->seg = now_seg; |
| 7447 | } |
| 7448 | |
| 7449 | frag_wane (frag_now); |
| 7450 | frag_new (0); |
| 7451 | xtensa_set_frag_assembly_state (frag_now); |
| 7452 | varP = frag_var (rs_machine_dependent, size, size, RELAX_TRAMPOLINE, NULL, 0, NULL); |
| 7453 | fragP = (fragS *)(varP - SIZEOF_STRUCT_FRAG); |
| 7454 | if (trampoline_buf == NULL) |
| 7455 | { |
| 7456 | trampoline_buf = xtensa_insnbuf_alloc (xtensa_default_isa); |
| 7457 | trampoline_slotbuf = xtensa_insnbuf_alloc (xtensa_default_isa); |
| 7458 | } |
| 7459 | tf = (struct trampoline_frag *)xmalloc(sizeof (struct trampoline_frag)); |
| 7460 | tf->next = ts->trampoline_list.next; |
| 7461 | ts->trampoline_list.next = tf; |
| 7462 | tf->needs_jump_around = needs_jump_around; |
| 7463 | tf->fragP = fragP; |
| 7464 | tf->fixP = NULL; |
| 7465 | } |
| 7466 | |
| 7467 | |
| 7468 | static struct trampoline_seg * |
| 7469 | find_trampoline_seg (asection *seg) |
| 7470 | { |
| 7471 | struct trampoline_seg *ts = trampoline_seg_list.next; |
| 7472 | |
| 7473 | for ( ; ts; ts = ts->next) |
| 7474 | { |
| 7475 | if (ts->seg == seg) |
| 7476 | return ts; |
| 7477 | } |
| 7478 | |
| 7479 | return NULL; |
| 7480 | } |
| 7481 | |
| 7482 | |
| 7483 | void dump_trampolines (void); |
| 7484 | |
| 7485 | void |
| 7486 | dump_trampolines (void) |
| 7487 | { |
| 7488 | struct trampoline_seg *ts = trampoline_seg_list.next; |
| 7489 | |
| 7490 | for ( ; ts; ts = ts->next) |
| 7491 | { |
| 7492 | asection *seg = ts->seg; |
| 7493 | |
| 7494 | if (seg == NULL) |
| 7495 | continue; |
| 7496 | fprintf(stderr, "SECTION %s\n", seg->name); |
| 7497 | struct trampoline_frag *tf = ts->trampoline_list.next; |
| 7498 | for ( ; tf; tf = tf->next) |
| 7499 | { |
| 7500 | if (tf->fragP == NULL) |
| 7501 | continue; |
| 7502 | fprintf(stderr, " 0x%08x: fix=%d, jump_around=%s\n", |
| 7503 | (int)tf->fragP->fr_address, (int)tf->fragP->fr_fix, |
| 7504 | tf->needs_jump_around ? "T" : "F"); |
| 7505 | } |
| 7506 | } |
| 7507 | } |
| 7508 | |
| 7509 | static void dump_litpools (void) __attribute__ ((unused)); |
| 7510 | |
| 7511 | static void |
| 7512 | dump_litpools (void) |
| 7513 | { |
| 7514 | struct litpool_seg *lps = litpool_seg_list.next; |
| 7515 | struct litpool_frag *lpf; |
| 7516 | |
| 7517 | for ( ; lps ; lps = lps->next ) |
| 7518 | { |
| 7519 | printf("litpool seg %s\n", lps->seg->name); |
| 7520 | for ( lpf = lps->frag_list.next; lpf->fragP; lpf = lpf->next ) |
| 7521 | { |
| 7522 | fragS *litfrag = lpf->fragP->fr_next; |
| 7523 | int count = 0; |
| 7524 | while (litfrag && litfrag->fr_subtype != RELAX_LITERAL_POOL_END) |
| 7525 | { |
| 7526 | if (litfrag->fr_fix == 4) |
| 7527 | count++; |
| 7528 | litfrag = litfrag->fr_next; |
| 7529 | } |
| 7530 | printf(" %ld <%d:%d> (%d) [%d]: ", |
| 7531 | lpf->addr, lpf->priority, lpf->original_priority, |
| 7532 | lpf->fragP->fr_line, count); |
| 7533 | //dump_frag(lpf->fragP); |
| 7534 | } |
| 7535 | } |
| 7536 | } |
| 7537 | |
| 7538 | static void |
| 7539 | xtensa_maybe_create_literal_pool_frag (bfd_boolean create, |
| 7540 | bfd_boolean only_if_needed) |
| 7541 | { |
| 7542 | struct litpool_seg *lps = litpool_seg_list.next; |
| 7543 | fragS *fragP; |
| 7544 | struct litpool_frag *lpf; |
| 7545 | bfd_boolean needed = FALSE; |
| 7546 | |
| 7547 | if (use_literal_section || !auto_litpools) |
| 7548 | return; |
| 7549 | |
| 7550 | for ( ; lps ; lps = lps->next ) |
| 7551 | { |
| 7552 | if (lps->seg == now_seg) |
| 7553 | break; |
| 7554 | } |
| 7555 | |
| 7556 | if (lps == NULL) |
| 7557 | { |
| 7558 | lps = (struct litpool_seg *)xcalloc (sizeof (struct litpool_seg), 1); |
| 7559 | lps->next = litpool_seg_list.next; |
| 7560 | litpool_seg_list.next = lps; |
| 7561 | lps->seg = now_seg; |
| 7562 | lps->frag_list.next = &lps->frag_list; |
| 7563 | lps->frag_list.prev = &lps->frag_list; |
| 7564 | } |
| 7565 | |
| 7566 | lps->frag_count++; |
| 7567 | |
| 7568 | if (create) |
| 7569 | { |
| 7570 | if (only_if_needed) |
| 7571 | { |
| 7572 | if (past_xtensa_end || !use_transform() || |
| 7573 | frag_now->tc_frag_data.is_no_transform) |
| 7574 | { |
| 7575 | return; |
| 7576 | } |
| 7577 | if (auto_litpool_limit <= 0) |
| 7578 | { |
| 7579 | /* Don't create a litpool based only on frag count. */ |
| 7580 | return; |
| 7581 | } |
| 7582 | else if (lps->frag_count > auto_litpool_limit) |
| 7583 | { |
| 7584 | needed = TRUE; |
| 7585 | } |
| 7586 | else |
| 7587 | { |
| 7588 | return; |
| 7589 | } |
| 7590 | } |
| 7591 | else |
| 7592 | { |
| 7593 | needed = TRUE; |
| 7594 | } |
| 7595 | } |
| 7596 | |
| 7597 | if (needed) |
| 7598 | { |
| 7599 | int size = (only_if_needed) ? 3 : 0; /* Space for a "j" insn. */ |
| 7600 | /* Create a potential site for a literal pool. */ |
| 7601 | frag_wane (frag_now); |
| 7602 | frag_new (0); |
| 7603 | xtensa_set_frag_assembly_state (frag_now); |
| 7604 | fragP = frag_now; |
| 7605 | fragP->tc_frag_data.lit_frchain = frchain_now; |
| 7606 | fragP->tc_frag_data.literal_frag = fragP; |
| 7607 | frag_var (rs_machine_dependent, size, size, |
| 7608 | (only_if_needed) ? |
| 7609 | RELAX_LITERAL_POOL_CANDIDATE_BEGIN : |
| 7610 | RELAX_LITERAL_POOL_BEGIN, |
| 7611 | NULL, 0, NULL); |
| 7612 | frag_now->tc_frag_data.lit_seg = now_seg; |
| 7613 | frag_variant (rs_machine_dependent, 0, 0, |
| 7614 | RELAX_LITERAL_POOL_END, NULL, 0, NULL); |
| 7615 | xtensa_set_frag_assembly_state (frag_now); |
| 7616 | } |
| 7617 | else |
| 7618 | { |
| 7619 | /* RELAX_LITERAL_POOL_BEGIN frag is being created; |
| 7620 | just record it here. */ |
| 7621 | fragP = frag_now; |
| 7622 | } |
| 7623 | |
| 7624 | lpf = (struct litpool_frag *)xmalloc(sizeof (struct litpool_frag)); |
| 7625 | /* Insert at tail of circular list. */ |
| 7626 | lpf->addr = 0; |
| 7627 | lps->frag_list.prev->next = lpf; |
| 7628 | lpf->next = &lps->frag_list; |
| 7629 | lpf->prev = lps->frag_list.prev; |
| 7630 | lps->frag_list.prev = lpf; |
| 7631 | lpf->fragP = fragP; |
| 7632 | lpf->priority = (needed) ? (only_if_needed) ? 3 : 2 : 1; |
| 7633 | lpf->original_priority = lpf->priority; |
| 7634 | |
| 7635 | lps->frag_count = 0; |
| 7636 | } |
| 7637 | |
| 7638 | static void |
| 7639 | xtensa_cleanup_align_frags (void) |
| 7640 | { |
| 7641 | frchainS *frchP; |
| 7642 | asection *s; |
| 7643 | |
| 7644 | for (s = stdoutput->sections; s; s = s->next) |
| 7645 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 7646 | { |
| 7647 | fragS *fragP; |
| 7648 | /* Walk over all of the fragments in a subsection. */ |
| 7649 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 7650 | { |
| 7651 | if ((fragP->fr_type == rs_align |
| 7652 | || fragP->fr_type == rs_align_code |
| 7653 | || (fragP->fr_type == rs_machine_dependent |
| 7654 | && (fragP->fr_subtype == RELAX_DESIRE_ALIGN |
| 7655 | || fragP->fr_subtype == RELAX_DESIRE_ALIGN_IF_TARGET))) |
| 7656 | && fragP->fr_fix == 0) |
| 7657 | { |
| 7658 | fragS *next = fragP->fr_next; |
| 7659 | |
| 7660 | while (next |
| 7661 | && next->fr_fix == 0 |
| 7662 | && next->fr_type == rs_machine_dependent |
| 7663 | && next->fr_subtype == RELAX_DESIRE_ALIGN_IF_TARGET) |
| 7664 | { |
| 7665 | frag_wane (next); |
| 7666 | next = next->fr_next; |
| 7667 | } |
| 7668 | } |
| 7669 | /* If we don't widen branch targets, then they |
| 7670 | will be easier to align. */ |
| 7671 | if (fragP->tc_frag_data.is_branch_target |
| 7672 | && fragP->fr_opcode == fragP->fr_literal |
| 7673 | && fragP->fr_type == rs_machine_dependent |
| 7674 | && fragP->fr_subtype == RELAX_SLOTS |
| 7675 | && fragP->tc_frag_data.slot_subtypes[0] == RELAX_NARROW) |
| 7676 | frag_wane (fragP); |
| 7677 | if (fragP->fr_type == rs_machine_dependent |
| 7678 | && fragP->fr_subtype == RELAX_UNREACHABLE) |
| 7679 | fragP->tc_frag_data.is_unreachable = TRUE; |
| 7680 | } |
| 7681 | } |
| 7682 | } |
| 7683 | |
| 7684 | |
| 7685 | /* Re-process all of the fragments looking to convert all of the |
| 7686 | RELAX_DESIRE_ALIGN_IF_TARGET fragments. If there is a branch |
| 7687 | target in the next fragment, convert this to RELAX_DESIRE_ALIGN. |
| 7688 | Otherwise, convert to a .fill 0. */ |
| 7689 | |
| 7690 | static void |
| 7691 | xtensa_fix_target_frags (void) |
| 7692 | { |
| 7693 | frchainS *frchP; |
| 7694 | asection *s; |
| 7695 | |
| 7696 | /* When this routine is called, all of the subsections are still intact |
| 7697 | so we walk over subsections instead of sections. */ |
| 7698 | for (s = stdoutput->sections; s; s = s->next) |
| 7699 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 7700 | { |
| 7701 | fragS *fragP; |
| 7702 | |
| 7703 | /* Walk over all of the fragments in a subsection. */ |
| 7704 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 7705 | { |
| 7706 | if (fragP->fr_type == rs_machine_dependent |
| 7707 | && fragP->fr_subtype == RELAX_DESIRE_ALIGN_IF_TARGET) |
| 7708 | { |
| 7709 | if (next_frag_is_branch_target (fragP)) |
| 7710 | fragP->fr_subtype = RELAX_DESIRE_ALIGN; |
| 7711 | else |
| 7712 | frag_wane (fragP); |
| 7713 | } |
| 7714 | } |
| 7715 | } |
| 7716 | } |
| 7717 | |
| 7718 | |
| 7719 | static bfd_boolean is_narrow_branch_guaranteed_in_range (fragS *, TInsn *); |
| 7720 | |
| 7721 | static void |
| 7722 | xtensa_mark_narrow_branches (void) |
| 7723 | { |
| 7724 | frchainS *frchP; |
| 7725 | asection *s; |
| 7726 | |
| 7727 | for (s = stdoutput->sections; s; s = s->next) |
| 7728 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 7729 | { |
| 7730 | fragS *fragP; |
| 7731 | /* Walk over all of the fragments in a subsection. */ |
| 7732 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 7733 | { |
| 7734 | if (fragP->fr_type == rs_machine_dependent |
| 7735 | && fragP->fr_subtype == RELAX_SLOTS |
| 7736 | && fragP->tc_frag_data.slot_subtypes[0] == RELAX_IMMED) |
| 7737 | { |
| 7738 | vliw_insn vinsn; |
| 7739 | |
| 7740 | vinsn_from_chars (&vinsn, fragP->fr_opcode); |
| 7741 | tinsn_immed_from_frag (&vinsn.slots[0], fragP, 0); |
| 7742 | |
| 7743 | if (vinsn.num_slots == 1 |
| 7744 | && xtensa_opcode_is_branch (xtensa_default_isa, |
| 7745 | vinsn.slots[0].opcode) == 1 |
| 7746 | && xg_get_single_size (vinsn.slots[0].opcode) == 2 |
| 7747 | && is_narrow_branch_guaranteed_in_range (fragP, |
| 7748 | &vinsn.slots[0])) |
| 7749 | { |
| 7750 | fragP->fr_subtype = RELAX_SLOTS; |
| 7751 | fragP->tc_frag_data.slot_subtypes[0] = RELAX_NARROW; |
| 7752 | fragP->tc_frag_data.is_aligning_branch = 1; |
| 7753 | } |
| 7754 | } |
| 7755 | } |
| 7756 | } |
| 7757 | } |
| 7758 | |
| 7759 | |
| 7760 | /* A branch is typically widened only when its target is out of |
| 7761 | range. However, we would like to widen them to align a subsequent |
| 7762 | branch target when possible. |
| 7763 | |
| 7764 | Because the branch relaxation code is so convoluted, the optimal solution |
| 7765 | (combining the two cases) is difficult to get right in all circumstances. |
| 7766 | We therefore go with an "almost as good" solution, where we only |
| 7767 | use for alignment narrow branches that definitely will not expand to a |
| 7768 | jump and a branch. These functions find and mark these cases. */ |
| 7769 | |
| 7770 | /* The range in bytes of BNEZ.N and BEQZ.N. The target operand is encoded |
| 7771 | as PC + 4 + imm6, where imm6 is a 6-bit immediate ranging from 0 to 63. |
| 7772 | We start counting beginning with the frag after the 2-byte branch, so the |
| 7773 | maximum offset is (4 - 2) + 63 = 65. */ |
| 7774 | #define MAX_IMMED6 65 |
| 7775 | |
| 7776 | static offsetT unrelaxed_frag_max_size (fragS *); |
| 7777 | |
| 7778 | static bfd_boolean |
| 7779 | is_narrow_branch_guaranteed_in_range (fragS *fragP, TInsn *tinsn) |
| 7780 | { |
| 7781 | const expressionS *exp = &tinsn->tok[1]; |
| 7782 | symbolS *symbolP = exp->X_add_symbol; |
| 7783 | offsetT max_distance = exp->X_add_number; |
| 7784 | fragS *target_frag; |
| 7785 | |
| 7786 | if (exp->X_op != O_symbol) |
| 7787 | return FALSE; |
| 7788 | |
| 7789 | target_frag = symbol_get_frag (symbolP); |
| 7790 | |
| 7791 | max_distance += (S_GET_VALUE (symbolP) - target_frag->fr_address); |
| 7792 | if (is_branch_jmp_to_next (tinsn, fragP)) |
| 7793 | return FALSE; |
| 7794 | |
| 7795 | /* The branch doesn't branch over it's own frag, |
| 7796 | but over the subsequent ones. */ |
| 7797 | fragP = fragP->fr_next; |
| 7798 | while (fragP != NULL && fragP != target_frag && max_distance <= MAX_IMMED6) |
| 7799 | { |
| 7800 | max_distance += unrelaxed_frag_max_size (fragP); |
| 7801 | fragP = fragP->fr_next; |
| 7802 | } |
| 7803 | if (max_distance <= MAX_IMMED6 && fragP == target_frag) |
| 7804 | return TRUE; |
| 7805 | return FALSE; |
| 7806 | } |
| 7807 | |
| 7808 | |
| 7809 | static void |
| 7810 | xtensa_mark_zcl_first_insns (void) |
| 7811 | { |
| 7812 | frchainS *frchP; |
| 7813 | asection *s; |
| 7814 | |
| 7815 | for (s = stdoutput->sections; s; s = s->next) |
| 7816 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 7817 | { |
| 7818 | fragS *fragP; |
| 7819 | /* Walk over all of the fragments in a subsection. */ |
| 7820 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 7821 | { |
| 7822 | if (fragP->fr_type == rs_machine_dependent |
| 7823 | && (fragP->fr_subtype == RELAX_ALIGN_NEXT_OPCODE |
| 7824 | || fragP->fr_subtype == RELAX_CHECK_ALIGN_NEXT_OPCODE)) |
| 7825 | { |
| 7826 | /* Find the loop frag. */ |
| 7827 | fragS *loop_frag = next_non_empty_frag (fragP); |
| 7828 | /* Find the first insn frag. */ |
| 7829 | fragS *targ_frag = next_non_empty_frag (loop_frag); |
| 7830 | |
| 7831 | /* Handle a corner case that comes up in hardware |
| 7832 | diagnostics. The original assembly looks like this: |
| 7833 | |
| 7834 | loop aX, LabelA |
| 7835 | <empty_frag>--not found by next_non_empty_frag |
| 7836 | loop aY, LabelB |
| 7837 | |
| 7838 | Depending on the start address, the assembler may or |
| 7839 | may not change it to look something like this: |
| 7840 | |
| 7841 | loop aX, LabelA |
| 7842 | nop--frag isn't empty anymore |
| 7843 | loop aY, LabelB |
| 7844 | |
| 7845 | So set up to check the alignment of the nop if it |
| 7846 | exists */ |
| 7847 | while (loop_frag != targ_frag) |
| 7848 | { |
| 7849 | if (loop_frag->fr_type == rs_machine_dependent |
| 7850 | && (loop_frag->fr_subtype == RELAX_ALIGN_NEXT_OPCODE |
| 7851 | || loop_frag->fr_subtype |
| 7852 | == RELAX_CHECK_ALIGN_NEXT_OPCODE)) |
| 7853 | targ_frag = loop_frag; |
| 7854 | else |
| 7855 | loop_frag = loop_frag->fr_next; |
| 7856 | } |
| 7857 | |
| 7858 | /* Of course, sometimes (mostly for toy test cases) a |
| 7859 | zero-cost loop instruction is the last in a section. */ |
| 7860 | if (targ_frag) |
| 7861 | { |
| 7862 | targ_frag->tc_frag_data.is_first_loop_insn = TRUE; |
| 7863 | /* Do not widen a frag that is the first instruction of a |
| 7864 | zero-cost loop. It makes that loop harder to align. */ |
| 7865 | if (targ_frag->fr_type == rs_machine_dependent |
| 7866 | && targ_frag->fr_subtype == RELAX_SLOTS |
| 7867 | && (targ_frag->tc_frag_data.slot_subtypes[0] |
| 7868 | == RELAX_NARROW)) |
| 7869 | { |
| 7870 | if (targ_frag->tc_frag_data.is_aligning_branch) |
| 7871 | targ_frag->tc_frag_data.slot_subtypes[0] = RELAX_IMMED; |
| 7872 | else |
| 7873 | { |
| 7874 | frag_wane (targ_frag); |
| 7875 | targ_frag->tc_frag_data.slot_subtypes[0] = 0; |
| 7876 | } |
| 7877 | } |
| 7878 | } |
| 7879 | if (fragP->fr_subtype == RELAX_CHECK_ALIGN_NEXT_OPCODE) |
| 7880 | frag_wane (fragP); |
| 7881 | } |
| 7882 | } |
| 7883 | } |
| 7884 | } |
| 7885 | |
| 7886 | |
| 7887 | /* When a difference-of-symbols expression is encoded as a uleb128 or |
| 7888 | sleb128 value, the linker is unable to adjust that value to account for |
| 7889 | link-time relaxation. Mark all the code between such symbols so that |
| 7890 | its size cannot be changed by linker relaxation. */ |
| 7891 | |
| 7892 | static void |
| 7893 | xtensa_mark_difference_of_two_symbols (void) |
| 7894 | { |
| 7895 | symbolS *expr_sym; |
| 7896 | |
| 7897 | for (expr_sym = expr_symbols; expr_sym; |
| 7898 | expr_sym = symbol_get_tc (expr_sym)->next_expr_symbol) |
| 7899 | { |
| 7900 | expressionS *exp = symbol_get_value_expression (expr_sym); |
| 7901 | |
| 7902 | if (exp->X_op == O_subtract) |
| 7903 | { |
| 7904 | symbolS *left = exp->X_add_symbol; |
| 7905 | symbolS *right = exp->X_op_symbol; |
| 7906 | |
| 7907 | /* Difference of two symbols not in the same section |
| 7908 | are handled with relocations in the linker. */ |
| 7909 | if (S_GET_SEGMENT (left) == S_GET_SEGMENT (right)) |
| 7910 | { |
| 7911 | fragS *start; |
| 7912 | fragS *end; |
| 7913 | fragS *walk; |
| 7914 | |
| 7915 | if (symbol_get_frag (left)->fr_address |
| 7916 | <= symbol_get_frag (right)->fr_address) |
| 7917 | { |
| 7918 | start = symbol_get_frag (left); |
| 7919 | end = symbol_get_frag (right); |
| 7920 | } |
| 7921 | else |
| 7922 | { |
| 7923 | start = symbol_get_frag (right); |
| 7924 | end = symbol_get_frag (left); |
| 7925 | } |
| 7926 | |
| 7927 | if (start->tc_frag_data.no_transform_end != NULL) |
| 7928 | walk = start->tc_frag_data.no_transform_end; |
| 7929 | else |
| 7930 | walk = start; |
| 7931 | do |
| 7932 | { |
| 7933 | walk->tc_frag_data.is_no_transform = 1; |
| 7934 | walk = walk->fr_next; |
| 7935 | } |
| 7936 | while (walk && walk->fr_address < end->fr_address); |
| 7937 | |
| 7938 | start->tc_frag_data.no_transform_end = walk; |
| 7939 | } |
| 7940 | } |
| 7941 | } |
| 7942 | } |
| 7943 | |
| 7944 | |
| 7945 | /* Re-process all of the fragments looking to convert all of the |
| 7946 | RELAX_ADD_NOP_IF_A0_B_RETW. If the next instruction is a |
| 7947 | conditional branch or a retw/retw.n, convert this frag to one that |
| 7948 | will generate a NOP. In any case close it off with a .fill 0. */ |
| 7949 | |
| 7950 | static bfd_boolean next_instrs_are_b_retw (fragS *); |
| 7951 | |
| 7952 | static void |
| 7953 | xtensa_fix_a0_b_retw_frags (void) |
| 7954 | { |
| 7955 | frchainS *frchP; |
| 7956 | asection *s; |
| 7957 | |
| 7958 | /* When this routine is called, all of the subsections are still intact |
| 7959 | so we walk over subsections instead of sections. */ |
| 7960 | for (s = stdoutput->sections; s; s = s->next) |
| 7961 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 7962 | { |
| 7963 | fragS *fragP; |
| 7964 | |
| 7965 | /* Walk over all of the fragments in a subsection. */ |
| 7966 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 7967 | { |
| 7968 | if (fragP->fr_type == rs_machine_dependent |
| 7969 | && fragP->fr_subtype == RELAX_ADD_NOP_IF_A0_B_RETW) |
| 7970 | { |
| 7971 | if (next_instrs_are_b_retw (fragP)) |
| 7972 | { |
| 7973 | if (fragP->tc_frag_data.is_no_transform) |
| 7974 | as_bad (_("instruction sequence (write a0, branch, retw) may trigger hardware errata")); |
| 7975 | else |
| 7976 | relax_frag_add_nop (fragP); |
| 7977 | } |
| 7978 | frag_wane (fragP); |
| 7979 | } |
| 7980 | } |
| 7981 | } |
| 7982 | } |
| 7983 | |
| 7984 | |
| 7985 | static bfd_boolean |
| 7986 | next_instrs_are_b_retw (fragS *fragP) |
| 7987 | { |
| 7988 | xtensa_opcode opcode; |
| 7989 | xtensa_format fmt; |
| 7990 | const fragS *next_fragP = next_non_empty_frag (fragP); |
| 7991 | static xtensa_insnbuf insnbuf = NULL; |
| 7992 | static xtensa_insnbuf slotbuf = NULL; |
| 7993 | xtensa_isa isa = xtensa_default_isa; |
| 7994 | int offset = 0; |
| 7995 | int slot; |
| 7996 | bfd_boolean branch_seen = FALSE; |
| 7997 | |
| 7998 | if (!insnbuf) |
| 7999 | { |
| 8000 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 8001 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 8002 | } |
| 8003 | |
| 8004 | if (next_fragP == NULL) |
| 8005 | return FALSE; |
| 8006 | |
| 8007 | /* Check for the conditional branch. */ |
| 8008 | xtensa_insnbuf_from_chars |
| 8009 | (isa, insnbuf, (unsigned char *) &next_fragP->fr_literal[offset], 0); |
| 8010 | fmt = xtensa_format_decode (isa, insnbuf); |
| 8011 | if (fmt == XTENSA_UNDEFINED) |
| 8012 | return FALSE; |
| 8013 | |
| 8014 | for (slot = 0; slot < xtensa_format_num_slots (isa, fmt); slot++) |
| 8015 | { |
| 8016 | xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf); |
| 8017 | opcode = xtensa_opcode_decode (isa, fmt, slot, slotbuf); |
| 8018 | |
| 8019 | branch_seen = (branch_seen |
| 8020 | || xtensa_opcode_is_branch (isa, opcode) == 1); |
| 8021 | } |
| 8022 | |
| 8023 | if (!branch_seen) |
| 8024 | return FALSE; |
| 8025 | |
| 8026 | offset += xtensa_format_length (isa, fmt); |
| 8027 | if (offset == next_fragP->fr_fix) |
| 8028 | { |
| 8029 | next_fragP = next_non_empty_frag (next_fragP); |
| 8030 | offset = 0; |
| 8031 | } |
| 8032 | |
| 8033 | if (next_fragP == NULL) |
| 8034 | return FALSE; |
| 8035 | |
| 8036 | /* Check for the retw/retw.n. */ |
| 8037 | xtensa_insnbuf_from_chars |
| 8038 | (isa, insnbuf, (unsigned char *) &next_fragP->fr_literal[offset], 0); |
| 8039 | fmt = xtensa_format_decode (isa, insnbuf); |
| 8040 | |
| 8041 | /* Because RETW[.N] is not bundleable, a VLIW bundle here means that we |
| 8042 | have no problems. */ |
| 8043 | if (fmt == XTENSA_UNDEFINED |
| 8044 | || xtensa_format_num_slots (isa, fmt) != 1) |
| 8045 | return FALSE; |
| 8046 | |
| 8047 | xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf); |
| 8048 | opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); |
| 8049 | |
| 8050 | if (opcode == xtensa_retw_opcode || opcode == xtensa_retw_n_opcode) |
| 8051 | return TRUE; |
| 8052 | |
| 8053 | return FALSE; |
| 8054 | } |
| 8055 | |
| 8056 | |
| 8057 | /* Re-process all of the fragments looking to convert all of the |
| 8058 | RELAX_ADD_NOP_IF_PRE_LOOP_END. If there is one instruction and a |
| 8059 | loop end label, convert this frag to one that will generate a NOP. |
| 8060 | In any case close it off with a .fill 0. */ |
| 8061 | |
| 8062 | static bfd_boolean next_instr_is_loop_end (fragS *); |
| 8063 | |
| 8064 | static void |
| 8065 | xtensa_fix_b_j_loop_end_frags (void) |
| 8066 | { |
| 8067 | frchainS *frchP; |
| 8068 | asection *s; |
| 8069 | |
| 8070 | /* When this routine is called, all of the subsections are still intact |
| 8071 | so we walk over subsections instead of sections. */ |
| 8072 | for (s = stdoutput->sections; s; s = s->next) |
| 8073 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 8074 | { |
| 8075 | fragS *fragP; |
| 8076 | |
| 8077 | /* Walk over all of the fragments in a subsection. */ |
| 8078 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 8079 | { |
| 8080 | if (fragP->fr_type == rs_machine_dependent |
| 8081 | && fragP->fr_subtype == RELAX_ADD_NOP_IF_PRE_LOOP_END) |
| 8082 | { |
| 8083 | if (next_instr_is_loop_end (fragP)) |
| 8084 | { |
| 8085 | if (fragP->tc_frag_data.is_no_transform) |
| 8086 | as_bad (_("branching or jumping to a loop end may trigger hardware errata")); |
| 8087 | else |
| 8088 | relax_frag_add_nop (fragP); |
| 8089 | } |
| 8090 | frag_wane (fragP); |
| 8091 | } |
| 8092 | } |
| 8093 | } |
| 8094 | } |
| 8095 | |
| 8096 | |
| 8097 | static bfd_boolean |
| 8098 | next_instr_is_loop_end (fragS *fragP) |
| 8099 | { |
| 8100 | const fragS *next_fragP; |
| 8101 | |
| 8102 | if (next_frag_is_loop_target (fragP)) |
| 8103 | return FALSE; |
| 8104 | |
| 8105 | next_fragP = next_non_empty_frag (fragP); |
| 8106 | if (next_fragP == NULL) |
| 8107 | return FALSE; |
| 8108 | |
| 8109 | if (!next_frag_is_loop_target (next_fragP)) |
| 8110 | return FALSE; |
| 8111 | |
| 8112 | /* If the size is >= 3 then there is more than one instruction here. |
| 8113 | The hardware bug will not fire. */ |
| 8114 | if (next_fragP->fr_fix > 3) |
| 8115 | return FALSE; |
| 8116 | |
| 8117 | return TRUE; |
| 8118 | } |
| 8119 | |
| 8120 | |
| 8121 | /* Re-process all of the fragments looking to convert all of the |
| 8122 | RELAX_ADD_NOP_IF_CLOSE_LOOP_END. If there is an loop end that is |
| 8123 | not MY loop's loop end within 12 bytes, add enough nops here to |
| 8124 | make it at least 12 bytes away. In any case close it off with a |
| 8125 | .fill 0. */ |
| 8126 | |
| 8127 | static offsetT min_bytes_to_other_loop_end |
| 8128 | (fragS *, fragS *, offsetT); |
| 8129 | |
| 8130 | static void |
| 8131 | xtensa_fix_close_loop_end_frags (void) |
| 8132 | { |
| 8133 | frchainS *frchP; |
| 8134 | asection *s; |
| 8135 | |
| 8136 | /* When this routine is called, all of the subsections are still intact |
| 8137 | so we walk over subsections instead of sections. */ |
| 8138 | for (s = stdoutput->sections; s; s = s->next) |
| 8139 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 8140 | { |
| 8141 | fragS *fragP; |
| 8142 | |
| 8143 | fragS *current_target = NULL; |
| 8144 | |
| 8145 | /* Walk over all of the fragments in a subsection. */ |
| 8146 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 8147 | { |
| 8148 | if (fragP->fr_type == rs_machine_dependent |
| 8149 | && ((fragP->fr_subtype == RELAX_ALIGN_NEXT_OPCODE) |
| 8150 | || (fragP->fr_subtype == RELAX_CHECK_ALIGN_NEXT_OPCODE))) |
| 8151 | current_target = symbol_get_frag (fragP->fr_symbol); |
| 8152 | |
| 8153 | if (current_target |
| 8154 | && fragP->fr_type == rs_machine_dependent |
| 8155 | && fragP->fr_subtype == RELAX_ADD_NOP_IF_CLOSE_LOOP_END) |
| 8156 | { |
| 8157 | offsetT min_bytes; |
| 8158 | int bytes_added = 0; |
| 8159 | |
| 8160 | #define REQUIRED_LOOP_DIVIDING_BYTES 12 |
| 8161 | /* Max out at 12. */ |
| 8162 | min_bytes = min_bytes_to_other_loop_end |
| 8163 | (fragP->fr_next, current_target, REQUIRED_LOOP_DIVIDING_BYTES); |
| 8164 | |
| 8165 | if (min_bytes < REQUIRED_LOOP_DIVIDING_BYTES) |
| 8166 | { |
| 8167 | if (fragP->tc_frag_data.is_no_transform) |
| 8168 | as_bad (_("loop end too close to another loop end may trigger hardware errata")); |
| 8169 | else |
| 8170 | { |
| 8171 | while (min_bytes + bytes_added |
| 8172 | < REQUIRED_LOOP_DIVIDING_BYTES) |
| 8173 | { |
| 8174 | int length = 3; |
| 8175 | |
| 8176 | if (fragP->fr_var < length) |
| 8177 | as_fatal (_("fr_var %lu < length %d"), |
| 8178 | (long) fragP->fr_var, length); |
| 8179 | else |
| 8180 | { |
| 8181 | assemble_nop (length, |
| 8182 | fragP->fr_literal + fragP->fr_fix); |
| 8183 | fragP->fr_fix += length; |
| 8184 | fragP->fr_var -= length; |
| 8185 | } |
| 8186 | bytes_added += length; |
| 8187 | } |
| 8188 | } |
| 8189 | } |
| 8190 | frag_wane (fragP); |
| 8191 | } |
| 8192 | gas_assert (fragP->fr_type != rs_machine_dependent |
| 8193 | || fragP->fr_subtype != RELAX_ADD_NOP_IF_CLOSE_LOOP_END); |
| 8194 | } |
| 8195 | } |
| 8196 | } |
| 8197 | |
| 8198 | |
| 8199 | static offsetT unrelaxed_frag_min_size (fragS *); |
| 8200 | |
| 8201 | static offsetT |
| 8202 | min_bytes_to_other_loop_end (fragS *fragP, |
| 8203 | fragS *current_target, |
| 8204 | offsetT max_size) |
| 8205 | { |
| 8206 | offsetT offset = 0; |
| 8207 | fragS *current_fragP; |
| 8208 | |
| 8209 | for (current_fragP = fragP; |
| 8210 | current_fragP; |
| 8211 | current_fragP = current_fragP->fr_next) |
| 8212 | { |
| 8213 | if (current_fragP->tc_frag_data.is_loop_target |
| 8214 | && current_fragP != current_target) |
| 8215 | return offset; |
| 8216 | |
| 8217 | offset += unrelaxed_frag_min_size (current_fragP); |
| 8218 | |
| 8219 | if (offset >= max_size) |
| 8220 | return max_size; |
| 8221 | } |
| 8222 | return max_size; |
| 8223 | } |
| 8224 | |
| 8225 | |
| 8226 | static offsetT |
| 8227 | unrelaxed_frag_min_size (fragS *fragP) |
| 8228 | { |
| 8229 | offsetT size = fragP->fr_fix; |
| 8230 | |
| 8231 | /* Add fill size. */ |
| 8232 | if (fragP->fr_type == rs_fill) |
| 8233 | size += fragP->fr_offset; |
| 8234 | |
| 8235 | return size; |
| 8236 | } |
| 8237 | |
| 8238 | |
| 8239 | static offsetT |
| 8240 | unrelaxed_frag_max_size (fragS *fragP) |
| 8241 | { |
| 8242 | offsetT size = fragP->fr_fix; |
| 8243 | switch (fragP->fr_type) |
| 8244 | { |
| 8245 | case 0: |
| 8246 | /* Empty frags created by the obstack allocation scheme |
| 8247 | end up with type 0. */ |
| 8248 | break; |
| 8249 | case rs_fill: |
| 8250 | case rs_org: |
| 8251 | case rs_space: |
| 8252 | size += fragP->fr_offset; |
| 8253 | break; |
| 8254 | case rs_align: |
| 8255 | case rs_align_code: |
| 8256 | case rs_align_test: |
| 8257 | case rs_leb128: |
| 8258 | case rs_cfa: |
| 8259 | case rs_dwarf2dbg: |
| 8260 | /* No further adjustments needed. */ |
| 8261 | break; |
| 8262 | case rs_machine_dependent: |
| 8263 | if (fragP->fr_subtype != RELAX_DESIRE_ALIGN) |
| 8264 | size += fragP->fr_var; |
| 8265 | break; |
| 8266 | default: |
| 8267 | /* We had darn well better know how big it is. */ |
| 8268 | gas_assert (0); |
| 8269 | break; |
| 8270 | } |
| 8271 | |
| 8272 | return size; |
| 8273 | } |
| 8274 | |
| 8275 | |
| 8276 | /* Re-process all of the fragments looking to convert all |
| 8277 | of the RELAX_ADD_NOP_IF_SHORT_LOOP. If: |
| 8278 | |
| 8279 | A) |
| 8280 | 1) the instruction size count to the loop end label |
| 8281 | is too short (<= 2 instructions), |
| 8282 | 2) loop has a jump or branch in it |
| 8283 | |
| 8284 | or B) |
| 8285 | 1) workaround_all_short_loops is TRUE |
| 8286 | 2) The generating loop was a 'loopgtz' or 'loopnez' |
| 8287 | 3) the instruction size count to the loop end label is too short |
| 8288 | (<= 2 instructions) |
| 8289 | then convert this frag (and maybe the next one) to generate a NOP. |
| 8290 | In any case close it off with a .fill 0. */ |
| 8291 | |
| 8292 | static int count_insns_to_loop_end (fragS *, bfd_boolean, int); |
| 8293 | static bfd_boolean branch_before_loop_end (fragS *); |
| 8294 | |
| 8295 | static void |
| 8296 | xtensa_fix_short_loop_frags (void) |
| 8297 | { |
| 8298 | frchainS *frchP; |
| 8299 | asection *s; |
| 8300 | |
| 8301 | /* When this routine is called, all of the subsections are still intact |
| 8302 | so we walk over subsections instead of sections. */ |
| 8303 | for (s = stdoutput->sections; s; s = s->next) |
| 8304 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 8305 | { |
| 8306 | fragS *fragP; |
| 8307 | xtensa_opcode current_opcode = XTENSA_UNDEFINED; |
| 8308 | |
| 8309 | /* Walk over all of the fragments in a subsection. */ |
| 8310 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 8311 | { |
| 8312 | if (fragP->fr_type == rs_machine_dependent |
| 8313 | && ((fragP->fr_subtype == RELAX_ALIGN_NEXT_OPCODE) |
| 8314 | || (fragP->fr_subtype == RELAX_CHECK_ALIGN_NEXT_OPCODE))) |
| 8315 | { |
| 8316 | TInsn t_insn; |
| 8317 | fragS *loop_frag = next_non_empty_frag (fragP); |
| 8318 | tinsn_from_chars (&t_insn, loop_frag->fr_opcode, 0); |
| 8319 | current_opcode = t_insn.opcode; |
| 8320 | gas_assert (xtensa_opcode_is_loop (xtensa_default_isa, |
| 8321 | current_opcode) == 1); |
| 8322 | } |
| 8323 | |
| 8324 | if (fragP->fr_type == rs_machine_dependent |
| 8325 | && fragP->fr_subtype == RELAX_ADD_NOP_IF_SHORT_LOOP) |
| 8326 | { |
| 8327 | if (count_insns_to_loop_end (fragP->fr_next, TRUE, 3) < 3 |
| 8328 | && (branch_before_loop_end (fragP->fr_next) |
| 8329 | || (workaround_all_short_loops |
| 8330 | && current_opcode != XTENSA_UNDEFINED |
| 8331 | && current_opcode != xtensa_loop_opcode))) |
| 8332 | { |
| 8333 | if (fragP->tc_frag_data.is_no_transform) |
| 8334 | as_bad (_("loop containing less than three instructions may trigger hardware errata")); |
| 8335 | else |
| 8336 | relax_frag_add_nop (fragP); |
| 8337 | } |
| 8338 | frag_wane (fragP); |
| 8339 | } |
| 8340 | } |
| 8341 | } |
| 8342 | } |
| 8343 | |
| 8344 | |
| 8345 | static int unrelaxed_frag_min_insn_count (fragS *); |
| 8346 | |
| 8347 | static int |
| 8348 | count_insns_to_loop_end (fragS *base_fragP, |
| 8349 | bfd_boolean count_relax_add, |
| 8350 | int max_count) |
| 8351 | { |
| 8352 | fragS *fragP = NULL; |
| 8353 | int insn_count = 0; |
| 8354 | |
| 8355 | fragP = base_fragP; |
| 8356 | |
| 8357 | for (; fragP && !fragP->tc_frag_data.is_loop_target; fragP = fragP->fr_next) |
| 8358 | { |
| 8359 | insn_count += unrelaxed_frag_min_insn_count (fragP); |
| 8360 | if (insn_count >= max_count) |
| 8361 | return max_count; |
| 8362 | |
| 8363 | if (count_relax_add) |
| 8364 | { |
| 8365 | if (fragP->fr_type == rs_machine_dependent |
| 8366 | && fragP->fr_subtype == RELAX_ADD_NOP_IF_SHORT_LOOP) |
| 8367 | { |
| 8368 | /* In order to add the appropriate number of |
| 8369 | NOPs, we count an instruction for downstream |
| 8370 | occurrences. */ |
| 8371 | insn_count++; |
| 8372 | if (insn_count >= max_count) |
| 8373 | return max_count; |
| 8374 | } |
| 8375 | } |
| 8376 | } |
| 8377 | return insn_count; |
| 8378 | } |
| 8379 | |
| 8380 | |
| 8381 | static int |
| 8382 | unrelaxed_frag_min_insn_count (fragS *fragP) |
| 8383 | { |
| 8384 | xtensa_isa isa = xtensa_default_isa; |
| 8385 | static xtensa_insnbuf insnbuf = NULL; |
| 8386 | int insn_count = 0; |
| 8387 | int offset = 0; |
| 8388 | |
| 8389 | if (!fragP->tc_frag_data.is_insn) |
| 8390 | return insn_count; |
| 8391 | |
| 8392 | if (!insnbuf) |
| 8393 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 8394 | |
| 8395 | /* Decode the fixed instructions. */ |
| 8396 | while (offset < fragP->fr_fix) |
| 8397 | { |
| 8398 | xtensa_format fmt; |
| 8399 | |
| 8400 | xtensa_insnbuf_from_chars |
| 8401 | (isa, insnbuf, (unsigned char *) fragP->fr_literal + offset, 0); |
| 8402 | fmt = xtensa_format_decode (isa, insnbuf); |
| 8403 | |
| 8404 | if (fmt == XTENSA_UNDEFINED) |
| 8405 | { |
| 8406 | as_fatal (_("undecodable instruction in instruction frag")); |
| 8407 | return insn_count; |
| 8408 | } |
| 8409 | offset += xtensa_format_length (isa, fmt); |
| 8410 | insn_count++; |
| 8411 | } |
| 8412 | |
| 8413 | return insn_count; |
| 8414 | } |
| 8415 | |
| 8416 | |
| 8417 | static bfd_boolean unrelaxed_frag_has_b_j (fragS *); |
| 8418 | |
| 8419 | static bfd_boolean |
| 8420 | branch_before_loop_end (fragS *base_fragP) |
| 8421 | { |
| 8422 | fragS *fragP; |
| 8423 | |
| 8424 | for (fragP = base_fragP; |
| 8425 | fragP && !fragP->tc_frag_data.is_loop_target; |
| 8426 | fragP = fragP->fr_next) |
| 8427 | { |
| 8428 | if (unrelaxed_frag_has_b_j (fragP)) |
| 8429 | return TRUE; |
| 8430 | } |
| 8431 | return FALSE; |
| 8432 | } |
| 8433 | |
| 8434 | |
| 8435 | static bfd_boolean |
| 8436 | unrelaxed_frag_has_b_j (fragS *fragP) |
| 8437 | { |
| 8438 | static xtensa_insnbuf insnbuf = NULL; |
| 8439 | xtensa_isa isa = xtensa_default_isa; |
| 8440 | int offset = 0; |
| 8441 | |
| 8442 | if (!fragP->tc_frag_data.is_insn) |
| 8443 | return FALSE; |
| 8444 | |
| 8445 | if (!insnbuf) |
| 8446 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 8447 | |
| 8448 | /* Decode the fixed instructions. */ |
| 8449 | while (offset < fragP->fr_fix) |
| 8450 | { |
| 8451 | xtensa_format fmt; |
| 8452 | int slot; |
| 8453 | |
| 8454 | xtensa_insnbuf_from_chars |
| 8455 | (isa, insnbuf, (unsigned char *) fragP->fr_literal + offset, 0); |
| 8456 | fmt = xtensa_format_decode (isa, insnbuf); |
| 8457 | if (fmt == XTENSA_UNDEFINED) |
| 8458 | return FALSE; |
| 8459 | |
| 8460 | for (slot = 0; slot < xtensa_format_num_slots (isa, fmt); slot++) |
| 8461 | { |
| 8462 | xtensa_opcode opcode = |
| 8463 | get_opcode_from_buf (fragP->fr_literal + offset, slot); |
| 8464 | if (xtensa_opcode_is_branch (isa, opcode) == 1 |
| 8465 | || xtensa_opcode_is_jump (isa, opcode) == 1) |
| 8466 | return TRUE; |
| 8467 | } |
| 8468 | offset += xtensa_format_length (isa, fmt); |
| 8469 | } |
| 8470 | return FALSE; |
| 8471 | } |
| 8472 | |
| 8473 | |
| 8474 | /* Checks to be made after initial assembly but before relaxation. */ |
| 8475 | |
| 8476 | static bfd_boolean is_empty_loop (const TInsn *, fragS *); |
| 8477 | static bfd_boolean is_local_forward_loop (const TInsn *, fragS *); |
| 8478 | |
| 8479 | static void |
| 8480 | xtensa_sanity_check (void) |
| 8481 | { |
| 8482 | const char *file_name; |
| 8483 | unsigned line; |
| 8484 | frchainS *frchP; |
| 8485 | asection *s; |
| 8486 | |
| 8487 | file_name = as_where (&line); |
| 8488 | for (s = stdoutput->sections; s; s = s->next) |
| 8489 | for (frchP = seg_info (s)->frchainP; frchP; frchP = frchP->frch_next) |
| 8490 | { |
| 8491 | fragS *fragP; |
| 8492 | |
| 8493 | /* Walk over all of the fragments in a subsection. */ |
| 8494 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 8495 | { |
| 8496 | if (fragP->fr_type == rs_machine_dependent |
| 8497 | && fragP->fr_subtype == RELAX_SLOTS |
| 8498 | && fragP->tc_frag_data.slot_subtypes[0] == RELAX_IMMED) |
| 8499 | { |
| 8500 | static xtensa_insnbuf insnbuf = NULL; |
| 8501 | TInsn t_insn; |
| 8502 | |
| 8503 | if (fragP->fr_opcode != NULL) |
| 8504 | { |
| 8505 | if (!insnbuf) |
| 8506 | insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa); |
| 8507 | tinsn_from_chars (&t_insn, fragP->fr_opcode, 0); |
| 8508 | tinsn_immed_from_frag (&t_insn, fragP, 0); |
| 8509 | |
| 8510 | if (xtensa_opcode_is_loop (xtensa_default_isa, |
| 8511 | t_insn.opcode) == 1) |
| 8512 | { |
| 8513 | if (is_empty_loop (&t_insn, fragP)) |
| 8514 | { |
| 8515 | new_logical_line (fragP->fr_file, fragP->fr_line); |
| 8516 | as_bad (_("invalid empty loop")); |
| 8517 | } |
| 8518 | if (!is_local_forward_loop (&t_insn, fragP)) |
| 8519 | { |
| 8520 | new_logical_line (fragP->fr_file, fragP->fr_line); |
| 8521 | as_bad (_("loop target does not follow " |
| 8522 | "loop instruction in section")); |
| 8523 | } |
| 8524 | } |
| 8525 | } |
| 8526 | } |
| 8527 | } |
| 8528 | } |
| 8529 | new_logical_line (file_name, line); |
| 8530 | } |
| 8531 | |
| 8532 | |
| 8533 | #define LOOP_IMMED_OPN 1 |
| 8534 | |
| 8535 | /* Return TRUE if the loop target is the next non-zero fragment. */ |
| 8536 | |
| 8537 | static bfd_boolean |
| 8538 | is_empty_loop (const TInsn *insn, fragS *fragP) |
| 8539 | { |
| 8540 | const expressionS *exp; |
| 8541 | symbolS *symbolP; |
| 8542 | fragS *next_fragP; |
| 8543 | |
| 8544 | if (insn->insn_type != ITYPE_INSN) |
| 8545 | return FALSE; |
| 8546 | |
| 8547 | if (xtensa_opcode_is_loop (xtensa_default_isa, insn->opcode) != 1) |
| 8548 | return FALSE; |
| 8549 | |
| 8550 | if (insn->ntok <= LOOP_IMMED_OPN) |
| 8551 | return FALSE; |
| 8552 | |
| 8553 | exp = &insn->tok[LOOP_IMMED_OPN]; |
| 8554 | |
| 8555 | if (exp->X_op != O_symbol) |
| 8556 | return FALSE; |
| 8557 | |
| 8558 | symbolP = exp->X_add_symbol; |
| 8559 | if (!symbolP) |
| 8560 | return FALSE; |
| 8561 | |
| 8562 | if (symbol_get_frag (symbolP) == NULL) |
| 8563 | return FALSE; |
| 8564 | |
| 8565 | if (S_GET_VALUE (symbolP) != 0) |
| 8566 | return FALSE; |
| 8567 | |
| 8568 | /* Walk through the zero-size fragments from this one. If we find |
| 8569 | the target fragment, then this is a zero-size loop. */ |
| 8570 | |
| 8571 | for (next_fragP = fragP->fr_next; |
| 8572 | next_fragP != NULL; |
| 8573 | next_fragP = next_fragP->fr_next) |
| 8574 | { |
| 8575 | if (next_fragP == symbol_get_frag (symbolP)) |
| 8576 | return TRUE; |
| 8577 | if (next_fragP->fr_fix != 0) |
| 8578 | return FALSE; |
| 8579 | } |
| 8580 | return FALSE; |
| 8581 | } |
| 8582 | |
| 8583 | |
| 8584 | static bfd_boolean |
| 8585 | is_local_forward_loop (const TInsn *insn, fragS *fragP) |
| 8586 | { |
| 8587 | const expressionS *exp; |
| 8588 | symbolS *symbolP; |
| 8589 | fragS *next_fragP; |
| 8590 | |
| 8591 | if (insn->insn_type != ITYPE_INSN) |
| 8592 | return FALSE; |
| 8593 | |
| 8594 | if (xtensa_opcode_is_loop (xtensa_default_isa, insn->opcode) != 1) |
| 8595 | return FALSE; |
| 8596 | |
| 8597 | if (insn->ntok <= LOOP_IMMED_OPN) |
| 8598 | return FALSE; |
| 8599 | |
| 8600 | exp = &insn->tok[LOOP_IMMED_OPN]; |
| 8601 | |
| 8602 | if (exp->X_op != O_symbol) |
| 8603 | return FALSE; |
| 8604 | |
| 8605 | symbolP = exp->X_add_symbol; |
| 8606 | if (!symbolP) |
| 8607 | return FALSE; |
| 8608 | |
| 8609 | if (symbol_get_frag (symbolP) == NULL) |
| 8610 | return FALSE; |
| 8611 | |
| 8612 | /* Walk through fragments until we find the target. |
| 8613 | If we do not find the target, then this is an invalid loop. */ |
| 8614 | |
| 8615 | for (next_fragP = fragP->fr_next; |
| 8616 | next_fragP != NULL; |
| 8617 | next_fragP = next_fragP->fr_next) |
| 8618 | { |
| 8619 | if (next_fragP == symbol_get_frag (symbolP)) |
| 8620 | return TRUE; |
| 8621 | } |
| 8622 | |
| 8623 | return FALSE; |
| 8624 | } |
| 8625 | |
| 8626 | |
| 8627 | #define XTINFO_NAME "Xtensa_Info" |
| 8628 | #define XTINFO_NAMESZ 12 |
| 8629 | #define XTINFO_TYPE 1 |
| 8630 | |
| 8631 | static void |
| 8632 | xtensa_add_config_info (void) |
| 8633 | { |
| 8634 | asection *info_sec; |
| 8635 | char *data, *p; |
| 8636 | int sz; |
| 8637 | |
| 8638 | info_sec = subseg_new (".xtensa.info", 0); |
| 8639 | bfd_set_section_flags (stdoutput, info_sec, SEC_HAS_CONTENTS | SEC_READONLY); |
| 8640 | |
| 8641 | data = xmalloc (100); |
| 8642 | sprintf (data, "USE_ABSOLUTE_LITERALS=%d\nABI=%d\n", |
| 8643 | XSHAL_USE_ABSOLUTE_LITERALS, XSHAL_ABI); |
| 8644 | sz = strlen (data) + 1; |
| 8645 | |
| 8646 | /* Add enough null terminators to pad to a word boundary. */ |
| 8647 | do |
| 8648 | data[sz++] = 0; |
| 8649 | while ((sz & 3) != 0); |
| 8650 | |
| 8651 | /* Follow the standard note section layout: |
| 8652 | First write the length of the name string. */ |
| 8653 | p = frag_more (4); |
| 8654 | md_number_to_chars (p, (valueT) XTINFO_NAMESZ, 4); |
| 8655 | |
| 8656 | /* Next comes the length of the "descriptor", i.e., the actual data. */ |
| 8657 | p = frag_more (4); |
| 8658 | md_number_to_chars (p, (valueT) sz, 4); |
| 8659 | |
| 8660 | /* Write the note type. */ |
| 8661 | p = frag_more (4); |
| 8662 | md_number_to_chars (p, (valueT) XTINFO_TYPE, 4); |
| 8663 | |
| 8664 | /* Write the name field. */ |
| 8665 | p = frag_more (XTINFO_NAMESZ); |
| 8666 | memcpy (p, XTINFO_NAME, XTINFO_NAMESZ); |
| 8667 | |
| 8668 | /* Finally, write the descriptor. */ |
| 8669 | p = frag_more (sz); |
| 8670 | memcpy (p, data, sz); |
| 8671 | |
| 8672 | free (data); |
| 8673 | } |
| 8674 | |
| 8675 | \f |
| 8676 | /* Alignment Functions. */ |
| 8677 | |
| 8678 | static int |
| 8679 | get_text_align_power (unsigned target_size) |
| 8680 | { |
| 8681 | if (target_size <= 4) |
| 8682 | return 2; |
| 8683 | |
| 8684 | if (target_size <= 8) |
| 8685 | return 3; |
| 8686 | |
| 8687 | if (target_size <= 16) |
| 8688 | return 4; |
| 8689 | |
| 8690 | if (target_size <= 32) |
| 8691 | return 5; |
| 8692 | |
| 8693 | if (target_size <= 64) |
| 8694 | return 6; |
| 8695 | |
| 8696 | if (target_size <= 128) |
| 8697 | return 7; |
| 8698 | |
| 8699 | if (target_size <= 256) |
| 8700 | return 8; |
| 8701 | |
| 8702 | if (target_size <= 512) |
| 8703 | return 9; |
| 8704 | |
| 8705 | if (target_size <= 1024) |
| 8706 | return 10; |
| 8707 | |
| 8708 | gas_assert (0); |
| 8709 | return 0; |
| 8710 | } |
| 8711 | |
| 8712 | |
| 8713 | static int |
| 8714 | get_text_align_max_fill_size (int align_pow, |
| 8715 | bfd_boolean use_nops, |
| 8716 | bfd_boolean use_no_density) |
| 8717 | { |
| 8718 | if (!use_nops) |
| 8719 | return (1 << align_pow); |
| 8720 | if (use_no_density) |
| 8721 | return 3 * (1 << align_pow); |
| 8722 | |
| 8723 | return 1 + (1 << align_pow); |
| 8724 | } |
| 8725 | |
| 8726 | |
| 8727 | /* Calculate the minimum bytes of fill needed at "address" to align a |
| 8728 | target instruction of size "target_size" so that it does not cross a |
| 8729 | power-of-two boundary specified by "align_pow". If "use_nops" is FALSE, |
| 8730 | the fill can be an arbitrary number of bytes. Otherwise, the space must |
| 8731 | be filled by NOP instructions. */ |
| 8732 | |
| 8733 | static int |
| 8734 | get_text_align_fill_size (addressT address, |
| 8735 | int align_pow, |
| 8736 | int target_size, |
| 8737 | bfd_boolean use_nops, |
| 8738 | bfd_boolean use_no_density) |
| 8739 | { |
| 8740 | addressT alignment, fill, fill_limit, fill_step; |
| 8741 | bfd_boolean skip_one = FALSE; |
| 8742 | |
| 8743 | alignment = (1 << align_pow); |
| 8744 | gas_assert (target_size > 0 && alignment >= (addressT) target_size); |
| 8745 | |
| 8746 | if (!use_nops) |
| 8747 | { |
| 8748 | fill_limit = alignment; |
| 8749 | fill_step = 1; |
| 8750 | } |
| 8751 | else if (!use_no_density) |
| 8752 | { |
| 8753 | /* Combine 2- and 3-byte NOPs to fill anything larger than one. */ |
| 8754 | fill_limit = alignment * 2; |
| 8755 | fill_step = 1; |
| 8756 | skip_one = TRUE; |
| 8757 | } |
| 8758 | else |
| 8759 | { |
| 8760 | /* Fill with 3-byte NOPs -- can only fill multiples of 3. */ |
| 8761 | fill_limit = alignment * 3; |
| 8762 | fill_step = 3; |
| 8763 | } |
| 8764 | |
| 8765 | /* Try all fill sizes until finding one that works. */ |
| 8766 | for (fill = 0; fill < fill_limit; fill += fill_step) |
| 8767 | { |
| 8768 | if (skip_one && fill == 1) |
| 8769 | continue; |
| 8770 | if ((address + fill) >> align_pow |
| 8771 | == (address + fill + target_size - 1) >> align_pow) |
| 8772 | return fill; |
| 8773 | } |
| 8774 | gas_assert (0); |
| 8775 | return 0; |
| 8776 | } |
| 8777 | |
| 8778 | |
| 8779 | static int |
| 8780 | branch_align_power (segT sec) |
| 8781 | { |
| 8782 | /* If the Xtensa processor has a fetch width of X, and |
| 8783 | the section is aligned to at least that boundary, then a branch |
| 8784 | target need only fit within that aligned block of memory to avoid |
| 8785 | a stall. Otherwise, try to fit branch targets within 4-byte |
| 8786 | aligned blocks (which may be insufficient, e.g., if the section |
| 8787 | has no alignment, but it's good enough). */ |
| 8788 | int fetch_align = get_text_align_power(xtensa_fetch_width); |
| 8789 | int sec_align = get_recorded_alignment (sec); |
| 8790 | |
| 8791 | if (sec_align >= fetch_align) |
| 8792 | return fetch_align; |
| 8793 | |
| 8794 | return 2; |
| 8795 | } |
| 8796 | |
| 8797 | |
| 8798 | /* This will assert if it is not possible. */ |
| 8799 | |
| 8800 | static int |
| 8801 | get_text_align_nop_count (offsetT fill_size, bfd_boolean use_no_density) |
| 8802 | { |
| 8803 | int count = 0; |
| 8804 | |
| 8805 | if (use_no_density) |
| 8806 | { |
| 8807 | gas_assert (fill_size % 3 == 0); |
| 8808 | return (fill_size / 3); |
| 8809 | } |
| 8810 | |
| 8811 | gas_assert (fill_size != 1); /* Bad argument. */ |
| 8812 | |
| 8813 | while (fill_size > 1) |
| 8814 | { |
| 8815 | int insn_size = 3; |
| 8816 | if (fill_size == 2 || fill_size == 4) |
| 8817 | insn_size = 2; |
| 8818 | fill_size -= insn_size; |
| 8819 | count++; |
| 8820 | } |
| 8821 | gas_assert (fill_size != 1); /* Bad algorithm. */ |
| 8822 | return count; |
| 8823 | } |
| 8824 | |
| 8825 | |
| 8826 | static int |
| 8827 | get_text_align_nth_nop_size (offsetT fill_size, |
| 8828 | int n, |
| 8829 | bfd_boolean use_no_density) |
| 8830 | { |
| 8831 | int count = 0; |
| 8832 | |
| 8833 | if (use_no_density) |
| 8834 | return 3; |
| 8835 | |
| 8836 | gas_assert (fill_size != 1); /* Bad argument. */ |
| 8837 | |
| 8838 | while (fill_size > 1) |
| 8839 | { |
| 8840 | int insn_size = 3; |
| 8841 | if (fill_size == 2 || fill_size == 4) |
| 8842 | insn_size = 2; |
| 8843 | fill_size -= insn_size; |
| 8844 | count++; |
| 8845 | if (n + 1 == count) |
| 8846 | return insn_size; |
| 8847 | } |
| 8848 | gas_assert (0); |
| 8849 | return 0; |
| 8850 | } |
| 8851 | |
| 8852 | |
| 8853 | /* For the given fragment, find the appropriate address |
| 8854 | for it to begin at if we are using NOPs to align it. */ |
| 8855 | |
| 8856 | static addressT |
| 8857 | get_noop_aligned_address (fragS *fragP, addressT address) |
| 8858 | { |
| 8859 | /* The rule is: get next fragment's FIRST instruction. Find |
| 8860 | the smallest number of bytes that need to be added to |
| 8861 | ensure that the next fragment's FIRST instruction will fit |
| 8862 | in a single word. |
| 8863 | |
| 8864 | E.G., 2 bytes : 0, 1, 2 mod 4 |
| 8865 | 3 bytes: 0, 1 mod 4 |
| 8866 | |
| 8867 | If the FIRST instruction MIGHT be relaxed, |
| 8868 | assume that it will become a 3-byte instruction. |
| 8869 | |
| 8870 | Note again here that LOOP instructions are not bundleable, |
| 8871 | and this relaxation only applies to LOOP opcodes. */ |
| 8872 | |
| 8873 | int fill_size = 0; |
| 8874 | int first_insn_size; |
| 8875 | int loop_insn_size; |
| 8876 | addressT pre_opcode_bytes; |
| 8877 | int align_power; |
| 8878 | fragS *first_insn; |
| 8879 | xtensa_opcode opcode; |
| 8880 | bfd_boolean is_loop; |
| 8881 | |
| 8882 | gas_assert (fragP->fr_type == rs_machine_dependent); |
| 8883 | gas_assert (fragP->fr_subtype == RELAX_ALIGN_NEXT_OPCODE); |
| 8884 | |
| 8885 | /* Find the loop frag. */ |
| 8886 | first_insn = next_non_empty_frag (fragP); |
| 8887 | /* Now find the first insn frag. */ |
| 8888 | first_insn = next_non_empty_frag (first_insn); |
| 8889 | |
| 8890 | is_loop = next_frag_opcode_is_loop (fragP, &opcode); |
| 8891 | gas_assert (is_loop); |
| 8892 | loop_insn_size = xg_get_single_size (opcode); |
| 8893 | |
| 8894 | pre_opcode_bytes = next_frag_pre_opcode_bytes (fragP); |
| 8895 | pre_opcode_bytes += loop_insn_size; |
| 8896 | |
| 8897 | /* For loops, the alignment depends on the size of the |
| 8898 | instruction following the loop, not the LOOP instruction. */ |
| 8899 | |
| 8900 | if (first_insn == NULL) |
| 8901 | first_insn_size = xtensa_fetch_width; |
| 8902 | else |
| 8903 | first_insn_size = get_loop_align_size (frag_format_size (first_insn)); |
| 8904 | |
| 8905 | /* If it was 8, then we'll need a larger alignment for the section. */ |
| 8906 | align_power = get_text_align_power (first_insn_size); |
| 8907 | record_alignment (now_seg, align_power); |
| 8908 | |
| 8909 | fill_size = get_text_align_fill_size |
| 8910 | (address + pre_opcode_bytes, align_power, first_insn_size, TRUE, |
| 8911 | fragP->tc_frag_data.is_no_density); |
| 8912 | |
| 8913 | return address + fill_size; |
| 8914 | } |
| 8915 | |
| 8916 | |
| 8917 | /* 3 mechanisms for relaxing an alignment: |
| 8918 | |
| 8919 | Align to a power of 2. |
| 8920 | Align so the next fragment's instruction does not cross a word boundary. |
| 8921 | Align the current instruction so that if the next instruction |
| 8922 | were 3 bytes, it would not cross a word boundary. |
| 8923 | |
| 8924 | We can align with: |
| 8925 | |
| 8926 | zeros - This is easy; always insert zeros. |
| 8927 | nops - 3-byte and 2-byte instructions |
| 8928 | 2 - 2-byte nop |
| 8929 | 3 - 3-byte nop |
| 8930 | 4 - 2 2-byte nops |
| 8931 | >=5 : 3-byte instruction + fn (n-3) |
| 8932 | widening - widen previous instructions. */ |
| 8933 | |
| 8934 | static offsetT |
| 8935 | get_aligned_diff (fragS *fragP, addressT address, offsetT *max_diff) |
| 8936 | { |
| 8937 | addressT target_address, loop_insn_offset; |
| 8938 | int target_size; |
| 8939 | xtensa_opcode loop_opcode; |
| 8940 | bfd_boolean is_loop; |
| 8941 | int align_power; |
| 8942 | offsetT opt_diff; |
| 8943 | offsetT branch_align; |
| 8944 | fragS *loop_frag; |
| 8945 | |
| 8946 | gas_assert (fragP->fr_type == rs_machine_dependent); |
| 8947 | switch (fragP->fr_subtype) |
| 8948 | { |
| 8949 | case RELAX_DESIRE_ALIGN: |
| 8950 | target_size = next_frag_format_size (fragP); |
| 8951 | if (target_size == XTENSA_UNDEFINED) |
| 8952 | target_size = 3; |
| 8953 | align_power = branch_align_power (now_seg); |
| 8954 | branch_align = 1 << align_power; |
| 8955 | /* Don't count on the section alignment being as large as the target. */ |
| 8956 | if (target_size > branch_align) |
| 8957 | target_size = branch_align; |
| 8958 | opt_diff = get_text_align_fill_size (address, align_power, |
| 8959 | target_size, FALSE, FALSE); |
| 8960 | |
| 8961 | *max_diff = (opt_diff + branch_align |
| 8962 | - (target_size + ((address + opt_diff) % branch_align))); |
| 8963 | gas_assert (*max_diff >= opt_diff); |
| 8964 | return opt_diff; |
| 8965 | |
| 8966 | case RELAX_ALIGN_NEXT_OPCODE: |
| 8967 | /* The next non-empty frag after this one holds the LOOP instruction |
| 8968 | that needs to be aligned. The required alignment depends on the |
| 8969 | size of the next non-empty frag after the loop frag, i.e., the |
| 8970 | first instruction in the loop. */ |
| 8971 | loop_frag = next_non_empty_frag (fragP); |
| 8972 | target_size = get_loop_align_size (next_frag_format_size (loop_frag)); |
| 8973 | loop_insn_offset = 0; |
| 8974 | is_loop = next_frag_opcode_is_loop (fragP, &loop_opcode); |
| 8975 | gas_assert (is_loop); |
| 8976 | |
| 8977 | /* If the loop has been expanded then the LOOP instruction |
| 8978 | could be at an offset from this fragment. */ |
| 8979 | if (loop_frag->tc_frag_data.slot_subtypes[0] != RELAX_IMMED) |
| 8980 | loop_insn_offset = get_expanded_loop_offset (loop_opcode); |
| 8981 | |
| 8982 | /* In an ideal world, which is what we are shooting for here, |
| 8983 | we wouldn't need to use any NOPs immediately prior to the |
| 8984 | LOOP instruction. If this approach fails, relax_frag_loop_align |
| 8985 | will call get_noop_aligned_address. */ |
| 8986 | target_address = |
| 8987 | address + loop_insn_offset + xg_get_single_size (loop_opcode); |
| 8988 | align_power = get_text_align_power (target_size); |
| 8989 | opt_diff = get_text_align_fill_size (target_address, align_power, |
| 8990 | target_size, FALSE, FALSE); |
| 8991 | |
| 8992 | *max_diff = xtensa_fetch_width |
| 8993 | - ((target_address + opt_diff) % xtensa_fetch_width) |
| 8994 | - target_size + opt_diff; |
| 8995 | gas_assert (*max_diff >= opt_diff); |
| 8996 | return opt_diff; |
| 8997 | |
| 8998 | default: |
| 8999 | break; |
| 9000 | } |
| 9001 | gas_assert (0); |
| 9002 | return 0; |
| 9003 | } |
| 9004 | |
| 9005 | \f |
| 9006 | /* md_relax_frag Hook and Helper Functions. */ |
| 9007 | |
| 9008 | static long relax_frag_loop_align (fragS *, long); |
| 9009 | static long relax_frag_for_align (fragS *, long); |
| 9010 | static long relax_frag_immed |
| 9011 | (segT, fragS *, long, int, xtensa_format, int, int *, bfd_boolean); |
| 9012 | |
| 9013 | typedef struct cached_fixup cached_fixupS; |
| 9014 | struct cached_fixup |
| 9015 | { |
| 9016 | int addr; |
| 9017 | int target; |
| 9018 | int delta; |
| 9019 | fixS *fixP; |
| 9020 | }; |
| 9021 | |
| 9022 | typedef struct fixup_cache fixup_cacheS; |
| 9023 | struct fixup_cache |
| 9024 | { |
| 9025 | cached_fixupS *fixups; |
| 9026 | unsigned n_fixups; |
| 9027 | unsigned n_max; |
| 9028 | |
| 9029 | segT seg; |
| 9030 | fragS *first_frag; |
| 9031 | }; |
| 9032 | |
| 9033 | static int fixup_order (const void *a, const void *b) |
| 9034 | { |
| 9035 | const cached_fixupS *pa = a; |
| 9036 | const cached_fixupS *pb = b; |
| 9037 | |
| 9038 | if (pa->addr == pb->addr) |
| 9039 | { |
| 9040 | if (pa->target == pb->target) |
| 9041 | { |
| 9042 | if (pa->fixP->fx_r_type == pb->fixP->fx_r_type) |
| 9043 | return 0; |
| 9044 | return pa->fixP->fx_r_type < pb->fixP->fx_r_type ? -1 : 1; |
| 9045 | } |
| 9046 | return pa->target - pb->target; |
| 9047 | } |
| 9048 | return pa->addr - pb->addr; |
| 9049 | } |
| 9050 | |
| 9051 | static bfd_boolean xtensa_make_cached_fixup (cached_fixupS *o, fixS *fixP) |
| 9052 | { |
| 9053 | xtensa_isa isa = xtensa_default_isa; |
| 9054 | int addr = fixP->fx_frag->fr_address; |
| 9055 | int target; |
| 9056 | int delta; |
| 9057 | symbolS *s = fixP->fx_addsy; |
| 9058 | int slot; |
| 9059 | xtensa_format fmt; |
| 9060 | xtensa_opcode opcode; |
| 9061 | |
| 9062 | if (fixP->fx_r_type < BFD_RELOC_XTENSA_SLOT0_OP || |
| 9063 | fixP->fx_r_type > BFD_RELOC_XTENSA_SLOT14_OP) |
| 9064 | return FALSE; |
| 9065 | target = S_GET_VALUE (s); |
| 9066 | delta = target - addr; |
| 9067 | |
| 9068 | if (abs(delta) < J_RANGE / 2) |
| 9069 | return FALSE; |
| 9070 | |
| 9071 | xtensa_insnbuf_from_chars (isa, trampoline_buf, |
| 9072 | (unsigned char *) fixP->fx_frag->fr_literal + |
| 9073 | fixP->fx_where, 0); |
| 9074 | fmt = xtensa_format_decode (isa, trampoline_buf); |
| 9075 | gas_assert (fmt != XTENSA_UNDEFINED); |
| 9076 | slot = fixP->tc_fix_data.slot; |
| 9077 | xtensa_format_get_slot (isa, fmt, slot, trampoline_buf, trampoline_slotbuf); |
| 9078 | opcode = xtensa_opcode_decode (isa, fmt, slot, trampoline_slotbuf); |
| 9079 | if (opcode != xtensa_j_opcode) |
| 9080 | return FALSE; |
| 9081 | |
| 9082 | o->addr = addr; |
| 9083 | o->target = target; |
| 9084 | o->delta = delta; |
| 9085 | o->fixP = fixP; |
| 9086 | |
| 9087 | return TRUE; |
| 9088 | } |
| 9089 | |
| 9090 | static void xtensa_realloc_fixup_cache (fixup_cacheS *cache, unsigned add) |
| 9091 | { |
| 9092 | if (cache->n_fixups + add > cache->n_max) |
| 9093 | { |
| 9094 | cache->n_max = (cache->n_fixups + add) * 2; |
| 9095 | cache->fixups = xrealloc (cache->fixups, |
| 9096 | sizeof (*cache->fixups) * cache->n_max); |
| 9097 | } |
| 9098 | } |
| 9099 | |
| 9100 | static void xtensa_cache_relaxable_fixups (fixup_cacheS *cache, |
| 9101 | segment_info_type *seginfo) |
| 9102 | { |
| 9103 | fixS *fixP; |
| 9104 | |
| 9105 | cache->n_fixups = 0; |
| 9106 | |
| 9107 | for (fixP = seginfo->fix_root; fixP ; fixP = fixP->fx_next) |
| 9108 | { |
| 9109 | xtensa_realloc_fixup_cache (cache, 1); |
| 9110 | |
| 9111 | if (xtensa_make_cached_fixup (cache->fixups + cache->n_fixups, fixP)) |
| 9112 | ++cache->n_fixups; |
| 9113 | } |
| 9114 | qsort (cache->fixups, cache->n_fixups, sizeof (*cache->fixups), fixup_order); |
| 9115 | } |
| 9116 | |
| 9117 | static unsigned xtensa_find_first_cached_fixup (const fixup_cacheS *cache, |
| 9118 | int addr) |
| 9119 | { |
| 9120 | unsigned a = 0; |
| 9121 | unsigned b = cache->n_fixups; |
| 9122 | |
| 9123 | while (b - a > 1) |
| 9124 | { |
| 9125 | unsigned c = (a + b) / 2; |
| 9126 | |
| 9127 | if (cache->fixups[c].addr < addr) |
| 9128 | a = c; |
| 9129 | else |
| 9130 | b = c; |
| 9131 | } |
| 9132 | return a; |
| 9133 | } |
| 9134 | |
| 9135 | static void xtensa_delete_cached_fixup (fixup_cacheS *cache, unsigned i) |
| 9136 | { |
| 9137 | memmove (cache->fixups + i, cache->fixups + i + 1, |
| 9138 | (cache->n_fixups - i - 1) * sizeof (*cache->fixups)); |
| 9139 | --cache->n_fixups; |
| 9140 | } |
| 9141 | |
| 9142 | static bfd_boolean xtensa_add_cached_fixup (fixup_cacheS *cache, fixS *fixP) |
| 9143 | { |
| 9144 | cached_fixupS o; |
| 9145 | unsigned i; |
| 9146 | |
| 9147 | if (!xtensa_make_cached_fixup (&o, fixP)) |
| 9148 | return FALSE; |
| 9149 | xtensa_realloc_fixup_cache (cache, 1); |
| 9150 | i = xtensa_find_first_cached_fixup (cache, o.addr); |
| 9151 | if (i < cache->n_fixups) |
| 9152 | { |
| 9153 | ++i; |
| 9154 | memmove (cache->fixups + i + 1, cache->fixups + i, |
| 9155 | (cache->n_fixups - i) * sizeof (*cache->fixups)); |
| 9156 | } |
| 9157 | cache->fixups[i] = o; |
| 9158 | ++cache->n_fixups; |
| 9159 | return TRUE; |
| 9160 | } |
| 9161 | |
| 9162 | /* Return the number of bytes added to this fragment, given that the |
| 9163 | input has been stretched already by "stretch". */ |
| 9164 | |
| 9165 | long |
| 9166 | xtensa_relax_frag (fragS *fragP, long stretch, int *stretched_p) |
| 9167 | { |
| 9168 | xtensa_isa isa = xtensa_default_isa; |
| 9169 | int unreported = fragP->tc_frag_data.unreported_expansion; |
| 9170 | long new_stretch = 0; |
| 9171 | const char *file_name; |
| 9172 | unsigned line; |
| 9173 | int lit_size; |
| 9174 | static xtensa_insnbuf vbuf = NULL; |
| 9175 | int slot, num_slots; |
| 9176 | xtensa_format fmt; |
| 9177 | |
| 9178 | file_name = as_where (&line); |
| 9179 | new_logical_line (fragP->fr_file, fragP->fr_line); |
| 9180 | |
| 9181 | fragP->tc_frag_data.unreported_expansion = 0; |
| 9182 | |
| 9183 | switch (fragP->fr_subtype) |
| 9184 | { |
| 9185 | case RELAX_ALIGN_NEXT_OPCODE: |
| 9186 | /* Always convert. */ |
| 9187 | if (fragP->tc_frag_data.relax_seen) |
| 9188 | new_stretch = relax_frag_loop_align (fragP, stretch); |
| 9189 | break; |
| 9190 | |
| 9191 | case RELAX_LOOP_END: |
| 9192 | /* Do nothing. */ |
| 9193 | break; |
| 9194 | |
| 9195 | case RELAX_LOOP_END_ADD_NOP: |
| 9196 | /* Add a NOP and switch to .fill 0. */ |
| 9197 | new_stretch = relax_frag_add_nop (fragP); |
| 9198 | frag_wane (fragP); |
| 9199 | break; |
| 9200 | |
| 9201 | case RELAX_DESIRE_ALIGN: |
| 9202 | /* Do nothing. The narrowing before this frag will either align |
| 9203 | it or not. */ |
| 9204 | break; |
| 9205 | |
| 9206 | case RELAX_LITERAL: |
| 9207 | case RELAX_LITERAL_FINAL: |
| 9208 | return 0; |
| 9209 | |
| 9210 | case RELAX_LITERAL_NR: |
| 9211 | lit_size = 4; |
| 9212 | fragP->fr_subtype = RELAX_LITERAL_FINAL; |
| 9213 | gas_assert (unreported == lit_size); |
| 9214 | memset (&fragP->fr_literal[fragP->fr_fix], 0, 4); |
| 9215 | fragP->fr_var -= lit_size; |
| 9216 | fragP->fr_fix += lit_size; |
| 9217 | new_stretch = 4; |
| 9218 | break; |
| 9219 | |
| 9220 | case RELAX_SLOTS: |
| 9221 | if (vbuf == NULL) |
| 9222 | vbuf = xtensa_insnbuf_alloc (isa); |
| 9223 | |
| 9224 | xtensa_insnbuf_from_chars |
| 9225 | (isa, vbuf, (unsigned char *) fragP->fr_opcode, 0); |
| 9226 | fmt = xtensa_format_decode (isa, vbuf); |
| 9227 | num_slots = xtensa_format_num_slots (isa, fmt); |
| 9228 | |
| 9229 | for (slot = 0; slot < num_slots; slot++) |
| 9230 | { |
| 9231 | switch (fragP->tc_frag_data.slot_subtypes[slot]) |
| 9232 | { |
| 9233 | case RELAX_NARROW: |
| 9234 | if (fragP->tc_frag_data.relax_seen) |
| 9235 | new_stretch += relax_frag_for_align (fragP, stretch); |
| 9236 | break; |
| 9237 | |
| 9238 | case RELAX_IMMED: |
| 9239 | case RELAX_IMMED_STEP1: |
| 9240 | case RELAX_IMMED_STEP2: |
| 9241 | case RELAX_IMMED_STEP3: |
| 9242 | /* Place the immediate. */ |
| 9243 | new_stretch += relax_frag_immed |
| 9244 | (now_seg, fragP, stretch, |
| 9245 | fragP->tc_frag_data.slot_subtypes[slot] - RELAX_IMMED, |
| 9246 | fmt, slot, stretched_p, FALSE); |
| 9247 | break; |
| 9248 | |
| 9249 | default: |
| 9250 | /* This is OK; see the note in xg_assemble_vliw_tokens. */ |
| 9251 | break; |
| 9252 | } |
| 9253 | } |
| 9254 | break; |
| 9255 | |
| 9256 | case RELAX_LITERAL_POOL_BEGIN: |
| 9257 | if (fragP->fr_var != 0) |
| 9258 | { |
| 9259 | /* We have a converted "candidate" literal pool; |
| 9260 | assemble a jump around it. */ |
| 9261 | TInsn insn; |
| 9262 | if (!litpool_slotbuf) |
| 9263 | { |
| 9264 | litpool_buf = xtensa_insnbuf_alloc (isa); |
| 9265 | litpool_slotbuf = xtensa_insnbuf_alloc (isa); |
| 9266 | } |
| 9267 | new_stretch += 3; |
| 9268 | fragP->tc_frag_data.relax_seen = FALSE; /* Need another pass. */ |
| 9269 | fragP->tc_frag_data.is_insn = TRUE; |
| 9270 | tinsn_init (&insn); |
| 9271 | insn.insn_type = ITYPE_INSN; |
| 9272 | insn.opcode = xtensa_j_opcode; |
| 9273 | insn.ntok = 1; |
| 9274 | set_expr_symbol_offset (&insn.tok[0], fragP->fr_symbol, |
| 9275 | fragP->fr_fix); |
| 9276 | fmt = xg_get_single_format (xtensa_j_opcode); |
| 9277 | tinsn_to_slotbuf (fmt, 0, &insn, litpool_slotbuf); |
| 9278 | xtensa_format_set_slot (isa, fmt, 0, litpool_buf, litpool_slotbuf); |
| 9279 | xtensa_insnbuf_to_chars (isa, litpool_buf, |
| 9280 | (unsigned char *)fragP->fr_literal + |
| 9281 | fragP->fr_fix, 3); |
| 9282 | fragP->fr_fix += 3; |
| 9283 | fragP->fr_var -= 3; |
| 9284 | /* Add a fix-up. */ |
| 9285 | fix_new (fragP, 0, 3, fragP->fr_symbol, 0, TRUE, |
| 9286 | BFD_RELOC_XTENSA_SLOT0_OP); |
| 9287 | } |
| 9288 | break; |
| 9289 | |
| 9290 | case RELAX_LITERAL_POOL_END: |
| 9291 | case RELAX_LITERAL_POOL_CANDIDATE_BEGIN: |
| 9292 | case RELAX_MAYBE_UNREACHABLE: |
| 9293 | case RELAX_MAYBE_DESIRE_ALIGN: |
| 9294 | /* No relaxation required. */ |
| 9295 | break; |
| 9296 | |
| 9297 | case RELAX_FILL_NOP: |
| 9298 | case RELAX_UNREACHABLE: |
| 9299 | if (fragP->tc_frag_data.relax_seen) |
| 9300 | new_stretch += relax_frag_for_align (fragP, stretch); |
| 9301 | break; |
| 9302 | |
| 9303 | case RELAX_TRAMPOLINE: |
| 9304 | if (fragP->tc_frag_data.relax_seen) |
| 9305 | { |
| 9306 | static fixup_cacheS fixup_cache; |
| 9307 | segment_info_type *seginfo = seg_info (now_seg); |
| 9308 | int trampaddr = fragP->fr_address + fragP->fr_fix; |
| 9309 | int searchaddr = trampaddr < J_RANGE ? 0 : trampaddr - J_RANGE; |
| 9310 | unsigned i; |
| 9311 | |
| 9312 | if (now_seg != fixup_cache.seg || |
| 9313 | fragP == fixup_cache.first_frag || |
| 9314 | fixup_cache.first_frag == NULL) |
| 9315 | { |
| 9316 | xtensa_cache_relaxable_fixups (&fixup_cache, seginfo); |
| 9317 | fixup_cache.seg = now_seg; |
| 9318 | fixup_cache.first_frag = fragP; |
| 9319 | } |
| 9320 | |
| 9321 | /* Scan for jumps that will not reach. */ |
| 9322 | for (i = xtensa_find_first_cached_fixup (&fixup_cache, searchaddr); |
| 9323 | i < fixup_cache.n_fixups; ++i) |
| 9324 | |
| 9325 | { |
| 9326 | fixS *fixP = fixup_cache.fixups[i].fixP; |
| 9327 | int target = fixup_cache.fixups[i].target; |
| 9328 | int addr = fixup_cache.fixups[i].addr; |
| 9329 | int delta = fixup_cache.fixups[i].delta + stretch; |
| 9330 | |
| 9331 | trampaddr = fragP->fr_address + fragP->fr_fix; |
| 9332 | |
| 9333 | if (addr + J_RANGE < trampaddr) |
| 9334 | continue; |
| 9335 | if (addr > trampaddr + J_RANGE) |
| 9336 | break; |
| 9337 | if (abs (delta) < J_RANGE) |
| 9338 | continue; |
| 9339 | |
| 9340 | slot = fixP->tc_fix_data.slot; |
| 9341 | |
| 9342 | if (delta > J_RANGE || delta < -1 * J_RANGE) |
| 9343 | { /* Found an out-of-range jump; scan the list of trampolines for the best match. */ |
| 9344 | struct trampoline_seg *ts = find_trampoline_seg (now_seg); |
| 9345 | struct trampoline_frag *tf = ts->trampoline_list.next; |
| 9346 | struct trampoline_frag *prev = &ts->trampoline_list; |
| 9347 | int lower = (target < addr) ? target : addr; |
| 9348 | int upper = (target > addr) ? target : addr; |
| 9349 | int midpoint = lower + (upper - lower) / 2; |
| 9350 | |
| 9351 | if ((upper - lower) > 2 * J_RANGE) |
| 9352 | { |
| 9353 | /* One trampoline won't suffice; we need multiple jumps. |
| 9354 | Jump to the trampoline that's farthest, but still in |
| 9355 | range relative to the original "j" instruction. */ |
| 9356 | for ( ; tf; prev = tf, tf = tf->next ) |
| 9357 | { |
| 9358 | int this_addr = tf->fragP->fr_address + tf->fragP->fr_fix; |
| 9359 | int next_addr = (tf->next) ? tf->next->fragP->fr_address + tf->next->fragP->fr_fix : 0 ; |
| 9360 | |
| 9361 | if (addr == lower) |
| 9362 | { |
| 9363 | /* Forward jump. */ |
| 9364 | if (this_addr - addr < J_RANGE) |
| 9365 | break; |
| 9366 | } |
| 9367 | else |
| 9368 | { |
| 9369 | /* Backward jump. */ |
| 9370 | if (next_addr == 0 || addr - next_addr > J_RANGE) |
| 9371 | break; |
| 9372 | } |
| 9373 | } |
| 9374 | } |
| 9375 | else |
| 9376 | { |
| 9377 | struct trampoline_frag *best_tf = NULL; |
| 9378 | int best_delta = 0; |
| 9379 | |
| 9380 | for ( ; tf; prev = tf, tf = tf->next ) |
| 9381 | { |
| 9382 | int this_addr = tf->fragP->fr_address + tf->fragP->fr_fix; |
| 9383 | int this_delta = abs (this_addr - midpoint); |
| 9384 | |
| 9385 | if (!best_tf || this_delta < best_delta) |
| 9386 | { |
| 9387 | best_tf = tf; |
| 9388 | best_delta = this_delta; |
| 9389 | } |
| 9390 | } |
| 9391 | tf = best_tf; |
| 9392 | } |
| 9393 | if (tf->fragP == fragP) |
| 9394 | { |
| 9395 | if (abs (addr - trampaddr) < J_RANGE) |
| 9396 | { /* The trampoline is in range of original; fix it! */ |
| 9397 | fixS *newfixP; |
| 9398 | int offset; |
| 9399 | TInsn insn; |
| 9400 | symbolS *lsym; |
| 9401 | fragS *fP; /* The out-of-range jump. */ |
| 9402 | |
| 9403 | new_stretch += init_trampoline_frag (tf); |
| 9404 | offset = fragP->fr_fix; /* Where to assemble the j insn. */ |
| 9405 | lsym = fragP->fr_symbol; |
| 9406 | fP = fixP->fx_frag; |
| 9407 | /* Assemble a jump to the target label here. */ |
| 9408 | tinsn_init (&insn); |
| 9409 | insn.insn_type = ITYPE_INSN; |
| 9410 | insn.opcode = xtensa_j_opcode; |
| 9411 | insn.ntok = 1; |
| 9412 | set_expr_symbol_offset (&insn.tok[0], lsym, offset); |
| 9413 | fmt = xg_get_single_format (xtensa_j_opcode); |
| 9414 | tinsn_to_slotbuf (fmt, 0, &insn, trampoline_slotbuf); |
| 9415 | xtensa_format_set_slot (isa, fmt, 0, trampoline_buf, trampoline_slotbuf); |
| 9416 | xtensa_insnbuf_to_chars (isa, trampoline_buf, (unsigned char *)fragP->fr_literal + offset, 3); |
| 9417 | fragP->fr_fix += 3; |
| 9418 | fragP->fr_var -= 3; |
| 9419 | /* Add a fix-up for the original j insn. */ |
| 9420 | newfixP = fix_new (fP, fixP->fx_where, fixP->fx_size, lsym, fragP->fr_fix - 3, TRUE, fixP->fx_r_type); |
| 9421 | newfixP->fx_no_overflow = 1; |
| 9422 | newfixP->tc_fix_data.X_add_symbol = lsym; |
| 9423 | newfixP->tc_fix_data.X_add_number = offset; |
| 9424 | newfixP->tc_fix_data.slot = slot; |
| 9425 | |
| 9426 | xtensa_delete_cached_fixup (&fixup_cache, i); |
| 9427 | xtensa_add_cached_fixup (&fixup_cache, newfixP); |
| 9428 | |
| 9429 | /* Move the fix-up from the original j insn to this one. */ |
| 9430 | fixP->fx_frag = fragP; |
| 9431 | fixP->fx_where = fragP->fr_fix - 3; |
| 9432 | fixP->tc_fix_data.slot = 0; |
| 9433 | |
| 9434 | xtensa_add_cached_fixup (&fixup_cache, fixP); |
| 9435 | |
| 9436 | /* re-do current fixup */ |
| 9437 | --i; |
| 9438 | |
| 9439 | /* Adjust the jump around this trampoline (if present). */ |
| 9440 | if (tf->fixP != NULL) |
| 9441 | { |
| 9442 | tf->fixP->fx_offset += 3; |
| 9443 | } |
| 9444 | new_stretch += 3; |
| 9445 | fragP->tc_frag_data.relax_seen = FALSE; /* Need another pass. */ |
| 9446 | /* Do we have room for more? */ |
| 9447 | if (fragP->fr_var < 3) |
| 9448 | { /* No, convert to fill. */ |
| 9449 | frag_wane (fragP); |
| 9450 | fragP->fr_subtype = 0; |
| 9451 | /* Remove from the trampoline_list. */ |
| 9452 | prev->next = tf->next; |
| 9453 | if (fragP == fixup_cache.first_frag) |
| 9454 | fixup_cache.first_frag = NULL; |
| 9455 | break; |
| 9456 | } |
| 9457 | } |
| 9458 | } |
| 9459 | } |
| 9460 | } |
| 9461 | } |
| 9462 | break; |
| 9463 | |
| 9464 | default: |
| 9465 | as_bad (_("bad relaxation state")); |
| 9466 | } |
| 9467 | |
| 9468 | /* Tell gas we need another relaxation pass. */ |
| 9469 | if (! fragP->tc_frag_data.relax_seen) |
| 9470 | { |
| 9471 | fragP->tc_frag_data.relax_seen = TRUE; |
| 9472 | *stretched_p = 1; |
| 9473 | } |
| 9474 | |
| 9475 | new_logical_line (file_name, line); |
| 9476 | return new_stretch; |
| 9477 | } |
| 9478 | |
| 9479 | |
| 9480 | static long |
| 9481 | relax_frag_loop_align (fragS *fragP, long stretch) |
| 9482 | { |
| 9483 | addressT old_address, old_next_address, old_size; |
| 9484 | addressT new_address, new_next_address, new_size; |
| 9485 | addressT growth; |
| 9486 | |
| 9487 | /* All the frags with relax_frag_for_alignment prior to this one in the |
| 9488 | section have been done, hopefully eliminating the need for a NOP here. |
| 9489 | But, this will put it in if necessary. */ |
| 9490 | |
| 9491 | /* Calculate the old address of this fragment and the next fragment. */ |
| 9492 | old_address = fragP->fr_address - stretch; |
| 9493 | old_next_address = (fragP->fr_address - stretch + fragP->fr_fix + |
| 9494 | fragP->tc_frag_data.text_expansion[0]); |
| 9495 | old_size = old_next_address - old_address; |
| 9496 | |
| 9497 | /* Calculate the new address of this fragment and the next fragment. */ |
| 9498 | new_address = fragP->fr_address; |
| 9499 | new_next_address = |
| 9500 | get_noop_aligned_address (fragP, fragP->fr_address + fragP->fr_fix); |
| 9501 | new_size = new_next_address - new_address; |
| 9502 | |
| 9503 | growth = new_size - old_size; |
| 9504 | |
| 9505 | /* Fix up the text_expansion field and return the new growth. */ |
| 9506 | fragP->tc_frag_data.text_expansion[0] += growth; |
| 9507 | return growth; |
| 9508 | } |
| 9509 | |
| 9510 | |
| 9511 | /* Add a NOP instruction. */ |
| 9512 | |
| 9513 | static long |
| 9514 | relax_frag_add_nop (fragS *fragP) |
| 9515 | { |
| 9516 | char *nop_buf = fragP->fr_literal + fragP->fr_fix; |
| 9517 | int length = fragP->tc_frag_data.is_no_density ? 3 : 2; |
| 9518 | assemble_nop (length, nop_buf); |
| 9519 | fragP->tc_frag_data.is_insn = TRUE; |
| 9520 | |
| 9521 | if (fragP->fr_var < length) |
| 9522 | { |
| 9523 | as_fatal (_("fr_var (%ld) < length (%d)"), (long) fragP->fr_var, length); |
| 9524 | return 0; |
| 9525 | } |
| 9526 | |
| 9527 | fragP->fr_fix += length; |
| 9528 | fragP->fr_var -= length; |
| 9529 | return length; |
| 9530 | } |
| 9531 | |
| 9532 | |
| 9533 | static long future_alignment_required (fragS *, long); |
| 9534 | |
| 9535 | static long |
| 9536 | relax_frag_for_align (fragS *fragP, long stretch) |
| 9537 | { |
| 9538 | /* Overview of the relaxation procedure for alignment: |
| 9539 | We can widen with NOPs or by widening instructions or by filling |
| 9540 | bytes after jump instructions. Find the opportune places and widen |
| 9541 | them if necessary. */ |
| 9542 | |
| 9543 | long stretch_me; |
| 9544 | long diff; |
| 9545 | |
| 9546 | gas_assert (fragP->fr_subtype == RELAX_FILL_NOP |
| 9547 | || fragP->fr_subtype == RELAX_UNREACHABLE |
| 9548 | || (fragP->fr_subtype == RELAX_SLOTS |
| 9549 | && fragP->tc_frag_data.slot_subtypes[0] == RELAX_NARROW)); |
| 9550 | |
| 9551 | stretch_me = future_alignment_required (fragP, stretch); |
| 9552 | diff = stretch_me - fragP->tc_frag_data.text_expansion[0]; |
| 9553 | if (diff == 0) |
| 9554 | return 0; |
| 9555 | |
| 9556 | if (diff < 0) |
| 9557 | { |
| 9558 | /* We expanded on a previous pass. Can we shrink now? */ |
| 9559 | long shrink = fragP->tc_frag_data.text_expansion[0] - stretch_me; |
| 9560 | if (shrink <= stretch && stretch > 0) |
| 9561 | { |
| 9562 | fragP->tc_frag_data.text_expansion[0] = stretch_me; |
| 9563 | return -shrink; |
| 9564 | } |
| 9565 | return 0; |
| 9566 | } |
| 9567 | |
| 9568 | /* Below here, diff > 0. */ |
| 9569 | fragP->tc_frag_data.text_expansion[0] = stretch_me; |
| 9570 | |
| 9571 | return diff; |
| 9572 | } |
| 9573 | |
| 9574 | |
| 9575 | /* Return the address of the next frag that should be aligned. |
| 9576 | |
| 9577 | By "address" we mean the address it _would_ be at if there |
| 9578 | is no action taken to align it between here and the target frag. |
| 9579 | In other words, if no narrows and no fill nops are used between |
| 9580 | here and the frag to align, _even_if_ some of the frags we use |
| 9581 | to align targets have already expanded on a previous relaxation |
| 9582 | pass. |
| 9583 | |
| 9584 | Also, count each frag that may be used to help align the target. |
| 9585 | |
| 9586 | Return 0 if there are no frags left in the chain that need to be |
| 9587 | aligned. */ |
| 9588 | |
| 9589 | static addressT |
| 9590 | find_address_of_next_align_frag (fragS **fragPP, |
| 9591 | int *wide_nops, |
| 9592 | int *narrow_nops, |
| 9593 | int *widens, |
| 9594 | bfd_boolean *paddable) |
| 9595 | { |
| 9596 | fragS *fragP = *fragPP; |
| 9597 | addressT address = fragP->fr_address; |
| 9598 | |
| 9599 | /* Do not reset the counts to 0. */ |
| 9600 | |
| 9601 | while (fragP) |
| 9602 | { |
| 9603 | /* Limit this to a small search. */ |
| 9604 | if (*widens >= (int) xtensa_fetch_width) |
| 9605 | { |
| 9606 | *fragPP = fragP; |
| 9607 | return 0; |
| 9608 | } |
| 9609 | address += fragP->fr_fix; |
| 9610 | |
| 9611 | if (fragP->fr_type == rs_fill) |
| 9612 | address += fragP->fr_offset * fragP->fr_var; |
| 9613 | else if (fragP->fr_type == rs_machine_dependent) |
| 9614 | { |
| 9615 | switch (fragP->fr_subtype) |
| 9616 | { |
| 9617 | case RELAX_UNREACHABLE: |
| 9618 | *paddable = TRUE; |
| 9619 | break; |
| 9620 | |
| 9621 | case RELAX_FILL_NOP: |
| 9622 | (*wide_nops)++; |
| 9623 | if (!fragP->tc_frag_data.is_no_density) |
| 9624 | (*narrow_nops)++; |
| 9625 | break; |
| 9626 | |
| 9627 | case RELAX_SLOTS: |
| 9628 | if (fragP->tc_frag_data.slot_subtypes[0] == RELAX_NARROW) |
| 9629 | { |
| 9630 | (*widens)++; |
| 9631 | break; |
| 9632 | } |
| 9633 | address += total_frag_text_expansion (fragP); |
| 9634 | break; |
| 9635 | |
| 9636 | case RELAX_IMMED: |
| 9637 | address += fragP->tc_frag_data.text_expansion[0]; |
| 9638 | break; |
| 9639 | |
| 9640 | case RELAX_ALIGN_NEXT_OPCODE: |
| 9641 | case RELAX_DESIRE_ALIGN: |
| 9642 | *fragPP = fragP; |
| 9643 | return address; |
| 9644 | |
| 9645 | case RELAX_MAYBE_UNREACHABLE: |
| 9646 | case RELAX_MAYBE_DESIRE_ALIGN: |
| 9647 | /* Do nothing. */ |
| 9648 | break; |
| 9649 | |
| 9650 | default: |
| 9651 | /* Just punt if we don't know the type. */ |
| 9652 | *fragPP = fragP; |
| 9653 | return 0; |
| 9654 | } |
| 9655 | } |
| 9656 | else |
| 9657 | { |
| 9658 | /* Just punt if we don't know the type. */ |
| 9659 | *fragPP = fragP; |
| 9660 | return 0; |
| 9661 | } |
| 9662 | fragP = fragP->fr_next; |
| 9663 | } |
| 9664 | |
| 9665 | *fragPP = fragP; |
| 9666 | return 0; |
| 9667 | } |
| 9668 | |
| 9669 | |
| 9670 | static long bytes_to_stretch (fragS *, int, int, int, int); |
| 9671 | |
| 9672 | static long |
| 9673 | future_alignment_required (fragS *fragP, long stretch ATTRIBUTE_UNUSED) |
| 9674 | { |
| 9675 | fragS *this_frag = fragP; |
| 9676 | long address; |
| 9677 | int num_widens = 0; |
| 9678 | int wide_nops = 0; |
| 9679 | int narrow_nops = 0; |
| 9680 | bfd_boolean paddable = FALSE; |
| 9681 | offsetT local_opt_diff; |
| 9682 | offsetT opt_diff; |
| 9683 | offsetT max_diff; |
| 9684 | int stretch_amount = 0; |
| 9685 | int local_stretch_amount; |
| 9686 | int global_stretch_amount; |
| 9687 | |
| 9688 | address = find_address_of_next_align_frag |
| 9689 | (&fragP, &wide_nops, &narrow_nops, &num_widens, &paddable); |
| 9690 | |
| 9691 | if (!address) |
| 9692 | { |
| 9693 | if (this_frag->tc_frag_data.is_aligning_branch) |
| 9694 | this_frag->tc_frag_data.slot_subtypes[0] = RELAX_IMMED; |
| 9695 | else |
| 9696 | frag_wane (this_frag); |
| 9697 | } |
| 9698 | else |
| 9699 | { |
| 9700 | local_opt_diff = get_aligned_diff (fragP, address, &max_diff); |
| 9701 | opt_diff = local_opt_diff; |
| 9702 | gas_assert (opt_diff >= 0); |
| 9703 | gas_assert (max_diff >= opt_diff); |
| 9704 | if (max_diff == 0) |
| 9705 | return 0; |
| 9706 | |
| 9707 | if (fragP) |
| 9708 | fragP = fragP->fr_next; |
| 9709 | |
| 9710 | while (fragP && opt_diff < max_diff && address) |
| 9711 | { |
| 9712 | /* We only use these to determine if we can exit early |
| 9713 | because there will be plenty of ways to align future |
| 9714 | align frags. */ |
| 9715 | int glob_widens = 0; |
| 9716 | int dnn = 0; |
| 9717 | int dw = 0; |
| 9718 | bfd_boolean glob_pad = 0; |
| 9719 | address = find_address_of_next_align_frag |
| 9720 | (&fragP, &glob_widens, &dnn, &dw, &glob_pad); |
| 9721 | /* If there is a padable portion, then skip. */ |
| 9722 | if (glob_pad || glob_widens >= (1 << branch_align_power (now_seg))) |
| 9723 | address = 0; |
| 9724 | |
| 9725 | if (address) |
| 9726 | { |
| 9727 | offsetT next_m_diff; |
| 9728 | offsetT next_o_diff; |
| 9729 | |
| 9730 | /* Downrange frags haven't had stretch added to them yet. */ |
| 9731 | address += stretch; |
| 9732 | |
| 9733 | /* The address also includes any text expansion from this |
| 9734 | frag in a previous pass, but we don't want that. */ |
| 9735 | address -= this_frag->tc_frag_data.text_expansion[0]; |
| 9736 | |
| 9737 | /* Assume we are going to move at least opt_diff. In |
| 9738 | reality, we might not be able to, but assuming that |
| 9739 | we will helps catch cases where moving opt_diff pushes |
| 9740 | the next target from aligned to unaligned. */ |
| 9741 | address += opt_diff; |
| 9742 | |
| 9743 | next_o_diff = get_aligned_diff (fragP, address, &next_m_diff); |
| 9744 | |
| 9745 | /* Now cleanup for the adjustments to address. */ |
| 9746 | next_o_diff += opt_diff; |
| 9747 | next_m_diff += opt_diff; |
| 9748 | if (next_o_diff <= max_diff && next_o_diff > opt_diff) |
| 9749 | opt_diff = next_o_diff; |
| 9750 | if (next_m_diff < max_diff) |
| 9751 | max_diff = next_m_diff; |
| 9752 | fragP = fragP->fr_next; |
| 9753 | } |
| 9754 | } |
| 9755 | |
| 9756 | /* If there are enough wideners in between, do it. */ |
| 9757 | if (paddable) |
| 9758 | { |
| 9759 | if (this_frag->fr_subtype == RELAX_UNREACHABLE) |
| 9760 | { |
| 9761 | gas_assert (opt_diff <= (signed) xtensa_fetch_width); |
| 9762 | return opt_diff; |
| 9763 | } |
| 9764 | return 0; |
| 9765 | } |
| 9766 | local_stretch_amount |
| 9767 | = bytes_to_stretch (this_frag, wide_nops, narrow_nops, |
| 9768 | num_widens, local_opt_diff); |
| 9769 | global_stretch_amount |
| 9770 | = bytes_to_stretch (this_frag, wide_nops, narrow_nops, |
| 9771 | num_widens, opt_diff); |
| 9772 | /* If the condition below is true, then the frag couldn't |
| 9773 | stretch the correct amount for the global case, so we just |
| 9774 | optimize locally. We'll rely on the subsequent frags to get |
| 9775 | the correct alignment in the global case. */ |
| 9776 | if (global_stretch_amount < local_stretch_amount) |
| 9777 | stretch_amount = local_stretch_amount; |
| 9778 | else |
| 9779 | stretch_amount = global_stretch_amount; |
| 9780 | |
| 9781 | if (this_frag->fr_subtype == RELAX_SLOTS |
| 9782 | && this_frag->tc_frag_data.slot_subtypes[0] == RELAX_NARROW) |
| 9783 | gas_assert (stretch_amount <= 1); |
| 9784 | else if (this_frag->fr_subtype == RELAX_FILL_NOP) |
| 9785 | { |
| 9786 | if (this_frag->tc_frag_data.is_no_density) |
| 9787 | gas_assert (stretch_amount == 3 || stretch_amount == 0); |
| 9788 | else |
| 9789 | gas_assert (stretch_amount <= 3); |
| 9790 | } |
| 9791 | } |
| 9792 | return stretch_amount; |
| 9793 | } |
| 9794 | |
| 9795 | |
| 9796 | /* The idea: widen everything you can to get a target or loop aligned, |
| 9797 | then start using NOPs. |
| 9798 | |
| 9799 | wide_nops = the number of wide NOPs available for aligning |
| 9800 | narrow_nops = the number of narrow NOPs available for aligning |
| 9801 | (a subset of wide_nops) |
| 9802 | widens = the number of narrow instructions that should be widened |
| 9803 | |
| 9804 | */ |
| 9805 | |
| 9806 | static long |
| 9807 | bytes_to_stretch (fragS *this_frag, |
| 9808 | int wide_nops, |
| 9809 | int narrow_nops, |
| 9810 | int num_widens, |
| 9811 | int desired_diff) |
| 9812 | { |
| 9813 | int nops_needed; |
| 9814 | int nop_bytes; |
| 9815 | int extra_bytes; |
| 9816 | int bytes_short = desired_diff - num_widens; |
| 9817 | |
| 9818 | gas_assert (desired_diff >= 0 |
| 9819 | && desired_diff < (signed) xtensa_fetch_width); |
| 9820 | if (desired_diff == 0) |
| 9821 | return 0; |
| 9822 | |
| 9823 | gas_assert (wide_nops > 0 || num_widens > 0); |
| 9824 | |
| 9825 | /* Always prefer widening to NOP-filling. */ |
| 9826 | if (bytes_short < 0) |
| 9827 | { |
| 9828 | /* There are enough RELAX_NARROW frags after this one |
| 9829 | to align the target without widening this frag in any way. */ |
| 9830 | return 0; |
| 9831 | } |
| 9832 | |
| 9833 | if (bytes_short == 0) |
| 9834 | { |
| 9835 | /* Widen every narrow between here and the align target |
| 9836 | and the align target will be properly aligned. */ |
| 9837 | if (this_frag->fr_subtype == RELAX_FILL_NOP) |
| 9838 | return 0; |
| 9839 | else |
| 9840 | return 1; |
| 9841 | } |
| 9842 | |
| 9843 | /* From here we will need at least one NOP to get an alignment. |
| 9844 | However, we may not be able to align at all, in which case, |
| 9845 | don't widen. */ |
| 9846 | nops_needed = desired_diff / 3; |
| 9847 | |
| 9848 | /* If there aren't enough nops, don't widen. */ |
| 9849 | if (nops_needed > wide_nops) |
| 9850 | return 0; |
| 9851 | |
| 9852 | /* First try it with all wide nops. */ |
| 9853 | nop_bytes = nops_needed * 3; |
| 9854 | extra_bytes = desired_diff - nop_bytes; |
| 9855 | |
| 9856 | if (nop_bytes + num_widens >= desired_diff) |
| 9857 | { |
| 9858 | if (this_frag->fr_subtype == RELAX_FILL_NOP) |
| 9859 | return 3; |
| 9860 | else if (num_widens == extra_bytes) |
| 9861 | return 1; |
| 9862 | return 0; |
| 9863 | } |
| 9864 | |
| 9865 | /* Add a narrow nop. */ |
| 9866 | nops_needed++; |
| 9867 | nop_bytes += 2; |
| 9868 | extra_bytes -= 2; |
| 9869 | if (narrow_nops == 0 || nops_needed > wide_nops) |
| 9870 | return 0; |
| 9871 | |
| 9872 | if (nop_bytes + num_widens >= desired_diff && extra_bytes >= 0) |
| 9873 | { |
| 9874 | if (this_frag->fr_subtype == RELAX_FILL_NOP) |
| 9875 | return !this_frag->tc_frag_data.is_no_density ? 2 : 3; |
| 9876 | else if (num_widens == extra_bytes) |
| 9877 | return 1; |
| 9878 | return 0; |
| 9879 | } |
| 9880 | |
| 9881 | /* Replace a wide nop with a narrow nop--we can get here if |
| 9882 | extra_bytes was negative in the previous conditional. */ |
| 9883 | if (narrow_nops == 1) |
| 9884 | return 0; |
| 9885 | nop_bytes--; |
| 9886 | extra_bytes++; |
| 9887 | if (nop_bytes + num_widens >= desired_diff) |
| 9888 | { |
| 9889 | if (this_frag->fr_subtype == RELAX_FILL_NOP) |
| 9890 | return !this_frag->tc_frag_data.is_no_density ? 2 : 3; |
| 9891 | else if (num_widens == extra_bytes) |
| 9892 | return 1; |
| 9893 | return 0; |
| 9894 | } |
| 9895 | |
| 9896 | /* If we can't satisfy any of the above cases, then we can't align |
| 9897 | using padding or fill nops. */ |
| 9898 | return 0; |
| 9899 | } |
| 9900 | |
| 9901 | |
| 9902 | static struct trampoline_frag * |
| 9903 | search_trampolines (TInsn *tinsn, fragS *fragP, bfd_boolean unreachable_only) |
| 9904 | { |
| 9905 | struct trampoline_seg *ts = find_trampoline_seg (now_seg); |
| 9906 | struct trampoline_frag *tf = (ts) ? ts->trampoline_list.next : NULL; |
| 9907 | struct trampoline_frag *best_tf = NULL; |
| 9908 | int best_delta = 0; |
| 9909 | int best_addr = 0; |
| 9910 | symbolS *sym = tinsn->tok[0].X_add_symbol; |
| 9911 | offsetT target = S_GET_VALUE (sym) + tinsn->tok[0].X_add_number; |
| 9912 | offsetT addr = fragP->fr_address; |
| 9913 | offsetT lower = (addr < target) ? addr : target; |
| 9914 | offsetT upper = (addr > target) ? addr : target; |
| 9915 | int delta = upper - lower; |
| 9916 | offsetT midpoint = lower + delta / 2; |
| 9917 | int this_delta = -1; |
| 9918 | int this_addr = -1; |
| 9919 | |
| 9920 | if (delta > 2 * J_RANGE) |
| 9921 | { |
| 9922 | /* One trampoline won't do; we need multiple. |
| 9923 | Choose the farthest trampoline that's still in range of the original |
| 9924 | and let a later pass finish the job. */ |
| 9925 | for ( ; tf; tf = tf->next) |
| 9926 | { |
| 9927 | int next_addr = (tf->next) ? tf->next->fragP->fr_address + tf->next->fragP->fr_fix : 0; |
| 9928 | |
| 9929 | this_addr = tf->fragP->fr_address + tf->fragP->fr_fix; |
| 9930 | if (lower == addr) |
| 9931 | { |
| 9932 | /* Forward jump. */ |
| 9933 | if (this_addr - addr < J_RANGE) |
| 9934 | break; |
| 9935 | } |
| 9936 | else |
| 9937 | { |
| 9938 | /* Backward jump. */ |
| 9939 | if (next_addr == 0 || addr - next_addr > J_RANGE) |
| 9940 | break; |
| 9941 | } |
| 9942 | } |
| 9943 | if (abs (addr - this_addr) < J_RANGE) |
| 9944 | return tf; |
| 9945 | |
| 9946 | return NULL; |
| 9947 | } |
| 9948 | for ( ; tf; tf = tf->next) |
| 9949 | { |
| 9950 | this_addr = tf->fragP->fr_address + tf->fragP->fr_fix; |
| 9951 | this_delta = abs (this_addr - midpoint); |
| 9952 | if (unreachable_only && tf->needs_jump_around) |
| 9953 | continue; |
| 9954 | if (!best_tf || this_delta < best_delta) |
| 9955 | { |
| 9956 | best_tf = tf; |
| 9957 | best_delta = this_delta; |
| 9958 | best_addr = this_addr; |
| 9959 | } |
| 9960 | } |
| 9961 | |
| 9962 | if (best_tf && |
| 9963 | best_delta < J_RANGE && |
| 9964 | abs(best_addr - lower) < J_RANGE && |
| 9965 | abs(best_addr - upper) < J_RANGE) |
| 9966 | return best_tf; |
| 9967 | |
| 9968 | return NULL; /* No suitable trampoline found. */ |
| 9969 | } |
| 9970 | |
| 9971 | |
| 9972 | static struct trampoline_frag * |
| 9973 | get_best_trampoline (TInsn *tinsn, fragS *fragP) |
| 9974 | { |
| 9975 | struct trampoline_frag *tf = NULL; |
| 9976 | |
| 9977 | tf = search_trampolines (tinsn, fragP, TRUE); /* Try unreachable first. */ |
| 9978 | |
| 9979 | if (tf == NULL) |
| 9980 | tf = search_trampolines (tinsn, fragP, FALSE); /* Try ones needing a jump-around, too. */ |
| 9981 | |
| 9982 | return tf; |
| 9983 | } |
| 9984 | |
| 9985 | |
| 9986 | static void |
| 9987 | check_and_update_trampolines (void) |
| 9988 | { |
| 9989 | struct trampoline_seg *ts = find_trampoline_seg (now_seg); |
| 9990 | struct trampoline_frag *tf = ts->trampoline_list.next; |
| 9991 | struct trampoline_frag *prev = &ts->trampoline_list; |
| 9992 | |
| 9993 | for ( ; tf; prev = tf, tf = tf->next) |
| 9994 | { |
| 9995 | if (tf->fragP->fr_var < 3) |
| 9996 | { |
| 9997 | frag_wane (tf->fragP); |
| 9998 | prev->next = tf->next; |
| 9999 | tf->fragP = NULL; |
| 10000 | } |
| 10001 | } |
| 10002 | } |
| 10003 | |
| 10004 | |
| 10005 | static int |
| 10006 | init_trampoline_frag (struct trampoline_frag *trampP) |
| 10007 | { |
| 10008 | fragS *fp = trampP->fragP; |
| 10009 | int growth = 0; |
| 10010 | |
| 10011 | if (fp->fr_fix == 0) |
| 10012 | { |
| 10013 | symbolS *lsym; |
| 10014 | char label[10 + 2 * sizeof(fp)]; |
| 10015 | sprintf (label, ".L0_TR_%p", fp); |
| 10016 | |
| 10017 | lsym = (symbolS *)local_symbol_make (label, now_seg, 0, fp); |
| 10018 | fp->fr_symbol = lsym; |
| 10019 | if (trampP->needs_jump_around) |
| 10020 | { |
| 10021 | /* Add a jump around this block of jumps, in case |
| 10022 | control flows into this block. */ |
| 10023 | fixS *fixP; |
| 10024 | TInsn insn; |
| 10025 | xtensa_format fmt; |
| 10026 | xtensa_isa isa = xtensa_default_isa; |
| 10027 | |
| 10028 | fp->tc_frag_data.is_insn = 1; |
| 10029 | /* Assemble a jump insn. */ |
| 10030 | tinsn_init (&insn); |
| 10031 | insn.insn_type = ITYPE_INSN; |
| 10032 | insn.opcode = xtensa_j_opcode; |
| 10033 | insn.ntok = 1; |
| 10034 | set_expr_symbol_offset (&insn.tok[0], lsym, 3); |
| 10035 | fmt = xg_get_single_format (xtensa_j_opcode); |
| 10036 | tinsn_to_slotbuf (fmt, 0, &insn, trampoline_slotbuf); |
| 10037 | xtensa_format_set_slot (isa, fmt, 0, trampoline_buf, trampoline_slotbuf); |
| 10038 | xtensa_insnbuf_to_chars (isa, trampoline_buf, (unsigned char *)fp->fr_literal, 3); |
| 10039 | fp->fr_fix += 3; |
| 10040 | fp->fr_var -= 3; |
| 10041 | growth = 3; |
| 10042 | fixP = fix_new (fp, 0, 3, lsym, 3, TRUE, BFD_RELOC_XTENSA_SLOT0_OP); |
| 10043 | trampP->fixP = fixP; |
| 10044 | } |
| 10045 | } |
| 10046 | return growth; |
| 10047 | } |
| 10048 | |
| 10049 | |
| 10050 | static int |
| 10051 | add_jump_to_trampoline (struct trampoline_frag *trampP, fragS *origfrag) |
| 10052 | { |
| 10053 | fragS *tramp = trampP->fragP; |
| 10054 | fixS *fixP; |
| 10055 | int offset = tramp->fr_fix; /* Where to assemble the j insn. */ |
| 10056 | TInsn insn; |
| 10057 | symbolS *lsym; |
| 10058 | symbolS *tsym; |
| 10059 | int toffset; |
| 10060 | xtensa_format fmt; |
| 10061 | xtensa_isa isa = xtensa_default_isa; |
| 10062 | int growth = 0; |
| 10063 | |
| 10064 | lsym = tramp->fr_symbol; |
| 10065 | /* Assemble a jump to the target label in the trampoline frag. */ |
| 10066 | tsym = origfrag->tc_frag_data.slot_symbols[0]; |
| 10067 | toffset = origfrag-> tc_frag_data.slot_offsets[0]; |
| 10068 | tinsn_init (&insn); |
| 10069 | insn.insn_type = ITYPE_INSN; |
| 10070 | insn.opcode = xtensa_j_opcode; |
| 10071 | insn.ntok = 1; |
| 10072 | set_expr_symbol_offset (&insn.tok[0], tsym, toffset); |
| 10073 | fmt = xg_get_single_format (xtensa_j_opcode); |
| 10074 | tinsn_to_slotbuf (fmt, 0, &insn, trampoline_slotbuf); |
| 10075 | xtensa_format_set_slot (isa, fmt, 0, trampoline_buf, trampoline_slotbuf); |
| 10076 | xtensa_insnbuf_to_chars (isa, trampoline_buf, (unsigned char *)tramp->fr_literal + offset, 3); |
| 10077 | tramp->fr_fix += 3; |
| 10078 | tramp->fr_var -= 3; |
| 10079 | growth = 3; |
| 10080 | /* add a fix-up for the trampoline jump. */ |
| 10081 | fixP = fix_new (tramp, tramp->fr_fix - 3, 3, tsym, toffset, TRUE, BFD_RELOC_XTENSA_SLOT0_OP); |
| 10082 | /* Modify the jump at the start of this trampoline to point past the newly-added jump. */ |
| 10083 | fixP = trampP->fixP; |
| 10084 | if (fixP) |
| 10085 | fixP->fx_offset += 3; |
| 10086 | /* Modify the original j to point here. */ |
| 10087 | origfrag->tc_frag_data.slot_symbols[0] = lsym; |
| 10088 | origfrag->tc_frag_data.slot_offsets[0] = tramp->fr_fix - 3; |
| 10089 | /* If trampoline is full, remove it from the list. */ |
| 10090 | check_and_update_trampolines (); |
| 10091 | |
| 10092 | return growth; |
| 10093 | } |
| 10094 | |
| 10095 | |
| 10096 | static long |
| 10097 | relax_frag_immed (segT segP, |
| 10098 | fragS *fragP, |
| 10099 | long stretch, |
| 10100 | int min_steps, |
| 10101 | xtensa_format fmt, |
| 10102 | int slot, |
| 10103 | int *stretched_p, |
| 10104 | bfd_boolean estimate_only) |
| 10105 | { |
| 10106 | TInsn tinsn; |
| 10107 | int old_size; |
| 10108 | bfd_boolean negatable_branch = FALSE; |
| 10109 | bfd_boolean branch_jmp_to_next = FALSE; |
| 10110 | bfd_boolean from_wide_insn = FALSE; |
| 10111 | xtensa_isa isa = xtensa_default_isa; |
| 10112 | IStack istack; |
| 10113 | offsetT frag_offset; |
| 10114 | int num_steps; |
| 10115 | int num_text_bytes, num_literal_bytes; |
| 10116 | int literal_diff, total_text_diff, this_text_diff; |
| 10117 | |
| 10118 | gas_assert (fragP->fr_opcode != NULL); |
| 10119 | |
| 10120 | xg_clear_vinsn (&cur_vinsn); |
| 10121 | vinsn_from_chars (&cur_vinsn, fragP->fr_opcode); |
| 10122 | if (cur_vinsn.num_slots > 1) |
| 10123 | from_wide_insn = TRUE; |
| 10124 | |
| 10125 | tinsn = cur_vinsn.slots[slot]; |
| 10126 | tinsn_immed_from_frag (&tinsn, fragP, slot); |
| 10127 | |
| 10128 | if (estimate_only && xtensa_opcode_is_loop (isa, tinsn.opcode) == 1) |
| 10129 | return 0; |
| 10130 | |
| 10131 | if (workaround_b_j_loop_end && ! fragP->tc_frag_data.is_no_transform) |
| 10132 | branch_jmp_to_next = is_branch_jmp_to_next (&tinsn, fragP); |
| 10133 | |
| 10134 | negatable_branch = (xtensa_opcode_is_branch (isa, tinsn.opcode) == 1); |
| 10135 | |
| 10136 | old_size = xtensa_format_length (isa, fmt); |
| 10137 | |
| 10138 | /* Special case: replace a branch to the next instruction with a NOP. |
| 10139 | This is required to work around a hardware bug in T1040.0 and also |
| 10140 | serves as an optimization. */ |
| 10141 | |
| 10142 | if (branch_jmp_to_next |
| 10143 | && ((old_size == 2) || (old_size == 3)) |
| 10144 | && !next_frag_is_loop_target (fragP)) |
| 10145 | return 0; |
| 10146 | |
| 10147 | /* Here is the fun stuff: Get the immediate field from this |
| 10148 | instruction. If it fits, we are done. If not, find the next |
| 10149 | instruction sequence that fits. */ |
| 10150 | |
| 10151 | frag_offset = fragP->fr_opcode - fragP->fr_literal; |
| 10152 | istack_init (&istack); |
| 10153 | num_steps = xg_assembly_relax (&istack, &tinsn, segP, fragP, frag_offset, |
| 10154 | min_steps, stretch); |
| 10155 | gas_assert (num_steps >= min_steps && num_steps <= RELAX_IMMED_MAXSTEPS); |
| 10156 | |
| 10157 | fragP->tc_frag_data.slot_subtypes[slot] = (int) RELAX_IMMED + num_steps; |
| 10158 | |
| 10159 | /* Figure out the number of bytes needed. */ |
| 10160 | num_literal_bytes = get_num_stack_literal_bytes (&istack); |
| 10161 | literal_diff |
| 10162 | = num_literal_bytes - fragP->tc_frag_data.literal_expansion[slot]; |
| 10163 | num_text_bytes = get_num_stack_text_bytes (&istack); |
| 10164 | |
| 10165 | if (from_wide_insn) |
| 10166 | { |
| 10167 | int first = 0; |
| 10168 | while (istack.insn[first].opcode == XTENSA_UNDEFINED) |
| 10169 | first++; |
| 10170 | |
| 10171 | num_text_bytes += old_size; |
| 10172 | if (opcode_fits_format_slot (istack.insn[first].opcode, fmt, slot)) |
| 10173 | num_text_bytes -= xg_get_single_size (istack.insn[first].opcode); |
| 10174 | else |
| 10175 | { |
| 10176 | /* The first instruction in the relaxed sequence will go after |
| 10177 | the current wide instruction, and thus its symbolic immediates |
| 10178 | might not fit. */ |
| 10179 | |
| 10180 | istack_init (&istack); |
| 10181 | num_steps = xg_assembly_relax (&istack, &tinsn, segP, fragP, |
| 10182 | frag_offset + old_size, |
| 10183 | min_steps, stretch + old_size); |
| 10184 | gas_assert (num_steps >= min_steps && num_steps <= RELAX_IMMED_MAXSTEPS); |
| 10185 | |
| 10186 | fragP->tc_frag_data.slot_subtypes[slot] |
| 10187 | = (int) RELAX_IMMED + num_steps; |
| 10188 | |
| 10189 | num_literal_bytes = get_num_stack_literal_bytes (&istack); |
| 10190 | literal_diff |
| 10191 | = num_literal_bytes - fragP->tc_frag_data.literal_expansion[slot]; |
| 10192 | |
| 10193 | num_text_bytes = get_num_stack_text_bytes (&istack) + old_size; |
| 10194 | } |
| 10195 | } |
| 10196 | |
| 10197 | total_text_diff = num_text_bytes - old_size; |
| 10198 | this_text_diff = total_text_diff - fragP->tc_frag_data.text_expansion[slot]; |
| 10199 | |
| 10200 | /* It MUST get larger. If not, we could get an infinite loop. */ |
| 10201 | gas_assert (num_text_bytes >= 0); |
| 10202 | gas_assert (literal_diff >= 0); |
| 10203 | gas_assert (total_text_diff >= 0); |
| 10204 | |
| 10205 | fragP->tc_frag_data.text_expansion[slot] = total_text_diff; |
| 10206 | fragP->tc_frag_data.literal_expansion[slot] = num_literal_bytes; |
| 10207 | gas_assert (fragP->tc_frag_data.text_expansion[slot] >= 0); |
| 10208 | gas_assert (fragP->tc_frag_data.literal_expansion[slot] >= 0); |
| 10209 | |
| 10210 | /* Find the associated expandable literal for this. */ |
| 10211 | if (literal_diff != 0) |
| 10212 | { |
| 10213 | fragS *lit_fragP = fragP->tc_frag_data.literal_frags[slot]; |
| 10214 | if (lit_fragP) |
| 10215 | { |
| 10216 | gas_assert (literal_diff == 4); |
| 10217 | lit_fragP->tc_frag_data.unreported_expansion += literal_diff; |
| 10218 | |
| 10219 | /* We expect that the literal section state has NOT been |
| 10220 | modified yet. */ |
| 10221 | gas_assert (lit_fragP->fr_type == rs_machine_dependent |
| 10222 | && lit_fragP->fr_subtype == RELAX_LITERAL); |
| 10223 | lit_fragP->fr_subtype = RELAX_LITERAL_NR; |
| 10224 | |
| 10225 | /* We need to mark this section for another iteration |
| 10226 | of relaxation. */ |
| 10227 | (*stretched_p)++; |
| 10228 | } |
| 10229 | } |
| 10230 | |
| 10231 | if (negatable_branch && istack.ninsn > 1) |
| 10232 | update_next_frag_state (fragP); |
| 10233 | |
| 10234 | /* If last insn is a jump, and it cannot reach its target, try to find a trampoline. */ |
| 10235 | if (istack.ninsn > 2 && |
| 10236 | istack.insn[istack.ninsn - 1].insn_type == ITYPE_LABEL && |
| 10237 | istack.insn[istack.ninsn - 2].insn_type == ITYPE_INSN && |
| 10238 | istack.insn[istack.ninsn - 2].opcode == xtensa_j_opcode) |
| 10239 | { |
| 10240 | TInsn *jinsn = &istack.insn[istack.ninsn - 2]; |
| 10241 | |
| 10242 | if (!xg_symbolic_immeds_fit (jinsn, segP, fragP, fragP->fr_offset, total_text_diff)) |
| 10243 | { |
| 10244 | struct trampoline_frag *tf = get_best_trampoline (jinsn, fragP); |
| 10245 | |
| 10246 | if (tf) |
| 10247 | { |
| 10248 | this_text_diff += init_trampoline_frag (tf); |
| 10249 | this_text_diff += add_jump_to_trampoline (tf, fragP); |
| 10250 | } |
| 10251 | else |
| 10252 | { |
| 10253 | /* If target symbol is undefined, assume it will reach once linked. */ |
| 10254 | expressionS *exp = &istack.insn[istack.ninsn - 2].tok[0]; |
| 10255 | |
| 10256 | if (exp->X_op == O_symbol && S_IS_DEFINED (exp->X_add_symbol)) |
| 10257 | { |
| 10258 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 10259 | _("jump target out of range; no usable trampoline found")); |
| 10260 | } |
| 10261 | } |
| 10262 | } |
| 10263 | } |
| 10264 | |
| 10265 | return this_text_diff; |
| 10266 | } |
| 10267 | |
| 10268 | \f |
| 10269 | /* md_convert_frag Hook and Helper Functions. */ |
| 10270 | |
| 10271 | static void convert_frag_align_next_opcode (fragS *); |
| 10272 | static void convert_frag_narrow (segT, fragS *, xtensa_format, int); |
| 10273 | static void convert_frag_fill_nop (fragS *); |
| 10274 | static void convert_frag_immed (segT, fragS *, int, xtensa_format, int); |
| 10275 | |
| 10276 | void |
| 10277 | md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT sec, fragS *fragp) |
| 10278 | { |
| 10279 | static xtensa_insnbuf vbuf = NULL; |
| 10280 | xtensa_isa isa = xtensa_default_isa; |
| 10281 | int slot; |
| 10282 | int num_slots; |
| 10283 | xtensa_format fmt; |
| 10284 | const char *file_name; |
| 10285 | unsigned line; |
| 10286 | |
| 10287 | file_name = as_where (&line); |
| 10288 | new_logical_line (fragp->fr_file, fragp->fr_line); |
| 10289 | |
| 10290 | switch (fragp->fr_subtype) |
| 10291 | { |
| 10292 | case RELAX_ALIGN_NEXT_OPCODE: |
| 10293 | /* Always convert. */ |
| 10294 | convert_frag_align_next_opcode (fragp); |
| 10295 | break; |
| 10296 | |
| 10297 | case RELAX_DESIRE_ALIGN: |
| 10298 | /* Do nothing. If not aligned already, too bad. */ |
| 10299 | break; |
| 10300 | |
| 10301 | case RELAX_LITERAL: |
| 10302 | case RELAX_LITERAL_FINAL: |
| 10303 | break; |
| 10304 | |
| 10305 | case RELAX_SLOTS: |
| 10306 | if (vbuf == NULL) |
| 10307 | vbuf = xtensa_insnbuf_alloc (isa); |
| 10308 | |
| 10309 | xtensa_insnbuf_from_chars |
| 10310 | (isa, vbuf, (unsigned char *) fragp->fr_opcode, 0); |
| 10311 | fmt = xtensa_format_decode (isa, vbuf); |
| 10312 | num_slots = xtensa_format_num_slots (isa, fmt); |
| 10313 | |
| 10314 | for (slot = 0; slot < num_slots; slot++) |
| 10315 | { |
| 10316 | switch (fragp->tc_frag_data.slot_subtypes[slot]) |
| 10317 | { |
| 10318 | case RELAX_NARROW: |
| 10319 | convert_frag_narrow (sec, fragp, fmt, slot); |
| 10320 | break; |
| 10321 | |
| 10322 | case RELAX_IMMED: |
| 10323 | case RELAX_IMMED_STEP1: |
| 10324 | case RELAX_IMMED_STEP2: |
| 10325 | case RELAX_IMMED_STEP3: |
| 10326 | /* Place the immediate. */ |
| 10327 | convert_frag_immed |
| 10328 | (sec, fragp, |
| 10329 | fragp->tc_frag_data.slot_subtypes[slot] - RELAX_IMMED, |
| 10330 | fmt, slot); |
| 10331 | break; |
| 10332 | |
| 10333 | default: |
| 10334 | /* This is OK because some slots could have |
| 10335 | relaxations and others have none. */ |
| 10336 | break; |
| 10337 | } |
| 10338 | } |
| 10339 | break; |
| 10340 | |
| 10341 | case RELAX_UNREACHABLE: |
| 10342 | memset (&fragp->fr_literal[fragp->fr_fix], 0, fragp->fr_var); |
| 10343 | fragp->fr_fix += fragp->tc_frag_data.text_expansion[0]; |
| 10344 | fragp->fr_var -= fragp->tc_frag_data.text_expansion[0]; |
| 10345 | frag_wane (fragp); |
| 10346 | break; |
| 10347 | |
| 10348 | case RELAX_MAYBE_UNREACHABLE: |
| 10349 | case RELAX_MAYBE_DESIRE_ALIGN: |
| 10350 | frag_wane (fragp); |
| 10351 | break; |
| 10352 | |
| 10353 | case RELAX_FILL_NOP: |
| 10354 | convert_frag_fill_nop (fragp); |
| 10355 | break; |
| 10356 | |
| 10357 | case RELAX_LITERAL_NR: |
| 10358 | if (use_literal_section) |
| 10359 | { |
| 10360 | /* This should have been handled during relaxation. When |
| 10361 | relaxing a code segment, literals sometimes need to be |
| 10362 | added to the corresponding literal segment. If that |
| 10363 | literal segment has already been relaxed, then we end up |
| 10364 | in this situation. Marking the literal segments as data |
| 10365 | would make this happen less often (since GAS always relaxes |
| 10366 | code before data), but we could still get into trouble if |
| 10367 | there are instructions in a segment that is not marked as |
| 10368 | containing code. Until we can implement a better solution, |
| 10369 | cheat and adjust the addresses of all the following frags. |
| 10370 | This could break subsequent alignments, but the linker's |
| 10371 | literal coalescing will do that anyway. */ |
| 10372 | |
| 10373 | fragS *f; |
| 10374 | fragp->fr_subtype = RELAX_LITERAL_FINAL; |
| 10375 | gas_assert (fragp->tc_frag_data.unreported_expansion == 4); |
| 10376 | memset (&fragp->fr_literal[fragp->fr_fix], 0, 4); |
| 10377 | fragp->fr_var -= 4; |
| 10378 | fragp->fr_fix += 4; |
| 10379 | for (f = fragp->fr_next; f; f = f->fr_next) |
| 10380 | f->fr_address += 4; |
| 10381 | } |
| 10382 | else |
| 10383 | as_bad (_("invalid relaxation fragment result")); |
| 10384 | break; |
| 10385 | |
| 10386 | case RELAX_TRAMPOLINE: |
| 10387 | break; |
| 10388 | } |
| 10389 | |
| 10390 | fragp->fr_var = 0; |
| 10391 | new_logical_line (file_name, line); |
| 10392 | } |
| 10393 | |
| 10394 | |
| 10395 | static void |
| 10396 | convert_frag_align_next_opcode (fragS *fragp) |
| 10397 | { |
| 10398 | char *nop_buf; /* Location for Writing. */ |
| 10399 | bfd_boolean use_no_density = fragp->tc_frag_data.is_no_density; |
| 10400 | addressT aligned_address; |
| 10401 | offsetT fill_size; |
| 10402 | int nop, nop_count; |
| 10403 | |
| 10404 | aligned_address = get_noop_aligned_address (fragp, fragp->fr_address + |
| 10405 | fragp->fr_fix); |
| 10406 | fill_size = aligned_address - (fragp->fr_address + fragp->fr_fix); |
| 10407 | nop_count = get_text_align_nop_count (fill_size, use_no_density); |
| 10408 | nop_buf = fragp->fr_literal + fragp->fr_fix; |
| 10409 | |
| 10410 | for (nop = 0; nop < nop_count; nop++) |
| 10411 | { |
| 10412 | int nop_size; |
| 10413 | nop_size = get_text_align_nth_nop_size (fill_size, nop, use_no_density); |
| 10414 | |
| 10415 | assemble_nop (nop_size, nop_buf); |
| 10416 | nop_buf += nop_size; |
| 10417 | } |
| 10418 | |
| 10419 | fragp->fr_fix += fill_size; |
| 10420 | fragp->fr_var -= fill_size; |
| 10421 | } |
| 10422 | |
| 10423 | |
| 10424 | static void |
| 10425 | convert_frag_narrow (segT segP, fragS *fragP, xtensa_format fmt, int slot) |
| 10426 | { |
| 10427 | TInsn tinsn, single_target; |
| 10428 | int size, old_size, diff; |
| 10429 | offsetT frag_offset; |
| 10430 | |
| 10431 | gas_assert (slot == 0); |
| 10432 | tinsn_from_chars (&tinsn, fragP->fr_opcode, 0); |
| 10433 | |
| 10434 | if (fragP->tc_frag_data.is_aligning_branch == 1) |
| 10435 | { |
| 10436 | gas_assert (fragP->tc_frag_data.text_expansion[0] == 1 |
| 10437 | || fragP->tc_frag_data.text_expansion[0] == 0); |
| 10438 | convert_frag_immed (segP, fragP, fragP->tc_frag_data.text_expansion[0], |
| 10439 | fmt, slot); |
| 10440 | return; |
| 10441 | } |
| 10442 | |
| 10443 | if (fragP->tc_frag_data.text_expansion[0] == 0) |
| 10444 | { |
| 10445 | /* No conversion. */ |
| 10446 | fragP->fr_var = 0; |
| 10447 | return; |
| 10448 | } |
| 10449 | |
| 10450 | gas_assert (fragP->fr_opcode != NULL); |
| 10451 | |
| 10452 | /* Frags in this relaxation state should only contain |
| 10453 | single instruction bundles. */ |
| 10454 | tinsn_immed_from_frag (&tinsn, fragP, 0); |
| 10455 | |
| 10456 | /* Just convert it to a wide form.... */ |
| 10457 | size = 0; |
| 10458 | old_size = xg_get_single_size (tinsn.opcode); |
| 10459 | |
| 10460 | tinsn_init (&single_target); |
| 10461 | frag_offset = fragP->fr_opcode - fragP->fr_literal; |
| 10462 | |
| 10463 | if (! xg_is_single_relaxable_insn (&tinsn, &single_target, FALSE)) |
| 10464 | { |
| 10465 | as_bad (_("unable to widen instruction")); |
| 10466 | return; |
| 10467 | } |
| 10468 | |
| 10469 | size = xg_get_single_size (single_target.opcode); |
| 10470 | xg_emit_insn_to_buf (&single_target, fragP->fr_opcode, fragP, |
| 10471 | frag_offset, TRUE); |
| 10472 | |
| 10473 | diff = size - old_size; |
| 10474 | gas_assert (diff >= 0); |
| 10475 | gas_assert (diff <= fragP->fr_var); |
| 10476 | fragP->fr_var -= diff; |
| 10477 | fragP->fr_fix += diff; |
| 10478 | |
| 10479 | /* clean it up */ |
| 10480 | fragP->fr_var = 0; |
| 10481 | } |
| 10482 | |
| 10483 | |
| 10484 | static void |
| 10485 | convert_frag_fill_nop (fragS *fragP) |
| 10486 | { |
| 10487 | char *loc = &fragP->fr_literal[fragP->fr_fix]; |
| 10488 | int size = fragP->tc_frag_data.text_expansion[0]; |
| 10489 | gas_assert ((unsigned) size == (fragP->fr_next->fr_address |
| 10490 | - fragP->fr_address - fragP->fr_fix)); |
| 10491 | if (size == 0) |
| 10492 | { |
| 10493 | /* No conversion. */ |
| 10494 | fragP->fr_var = 0; |
| 10495 | return; |
| 10496 | } |
| 10497 | assemble_nop (size, loc); |
| 10498 | fragP->tc_frag_data.is_insn = TRUE; |
| 10499 | fragP->fr_var -= size; |
| 10500 | fragP->fr_fix += size; |
| 10501 | frag_wane (fragP); |
| 10502 | } |
| 10503 | |
| 10504 | |
| 10505 | static fixS *fix_new_exp_in_seg |
| 10506 | (segT, subsegT, fragS *, int, int, expressionS *, int, |
| 10507 | bfd_reloc_code_real_type); |
| 10508 | static void convert_frag_immed_finish_loop (segT, fragS *, TInsn *); |
| 10509 | |
| 10510 | static void |
| 10511 | convert_frag_immed (segT segP, |
| 10512 | fragS *fragP, |
| 10513 | int min_steps, |
| 10514 | xtensa_format fmt, |
| 10515 | int slot) |
| 10516 | { |
| 10517 | char *immed_instr = fragP->fr_opcode; |
| 10518 | TInsn orig_tinsn; |
| 10519 | bfd_boolean expanded = FALSE; |
| 10520 | bfd_boolean branch_jmp_to_next = FALSE; |
| 10521 | char *fr_opcode = fragP->fr_opcode; |
| 10522 | xtensa_isa isa = xtensa_default_isa; |
| 10523 | bfd_boolean from_wide_insn = FALSE; |
| 10524 | int bytes; |
| 10525 | bfd_boolean is_loop; |
| 10526 | |
| 10527 | gas_assert (fr_opcode != NULL); |
| 10528 | |
| 10529 | xg_clear_vinsn (&cur_vinsn); |
| 10530 | |
| 10531 | vinsn_from_chars (&cur_vinsn, fr_opcode); |
| 10532 | if (cur_vinsn.num_slots > 1) |
| 10533 | from_wide_insn = TRUE; |
| 10534 | |
| 10535 | orig_tinsn = cur_vinsn.slots[slot]; |
| 10536 | tinsn_immed_from_frag (&orig_tinsn, fragP, slot); |
| 10537 | |
| 10538 | is_loop = xtensa_opcode_is_loop (xtensa_default_isa, orig_tinsn.opcode) == 1; |
| 10539 | |
| 10540 | if (workaround_b_j_loop_end && ! fragP->tc_frag_data.is_no_transform) |
| 10541 | branch_jmp_to_next = is_branch_jmp_to_next (&orig_tinsn, fragP); |
| 10542 | |
| 10543 | if (branch_jmp_to_next && !next_frag_is_loop_target (fragP)) |
| 10544 | { |
| 10545 | /* Conversion just inserts a NOP and marks the fix as completed. */ |
| 10546 | bytes = xtensa_format_length (isa, fmt); |
| 10547 | if (bytes >= 4) |
| 10548 | { |
| 10549 | cur_vinsn.slots[slot].opcode = |
| 10550 | xtensa_format_slot_nop_opcode (isa, cur_vinsn.format, slot); |
| 10551 | cur_vinsn.slots[slot].ntok = 0; |
| 10552 | } |
| 10553 | else |
| 10554 | { |
| 10555 | bytes += fragP->tc_frag_data.text_expansion[0]; |
| 10556 | gas_assert (bytes == 2 || bytes == 3); |
| 10557 | build_nop (&cur_vinsn.slots[0], bytes); |
| 10558 | fragP->fr_fix += fragP->tc_frag_data.text_expansion[0]; |
| 10559 | } |
| 10560 | vinsn_to_insnbuf (&cur_vinsn, fr_opcode, frag_now, TRUE); |
| 10561 | xtensa_insnbuf_to_chars |
| 10562 | (isa, cur_vinsn.insnbuf, (unsigned char *) fr_opcode, 0); |
| 10563 | fragP->fr_var = 0; |
| 10564 | } |
| 10565 | else |
| 10566 | { |
| 10567 | /* Here is the fun stuff: Get the immediate field from this |
| 10568 | instruction. If it fits, we're done. If not, find the next |
| 10569 | instruction sequence that fits. */ |
| 10570 | |
| 10571 | IStack istack; |
| 10572 | int i; |
| 10573 | symbolS *lit_sym = NULL; |
| 10574 | int total_size = 0; |
| 10575 | int target_offset = 0; |
| 10576 | int old_size; |
| 10577 | int diff; |
| 10578 | symbolS *gen_label = NULL; |
| 10579 | offsetT frag_offset; |
| 10580 | bfd_boolean first = TRUE; |
| 10581 | |
| 10582 | /* It does not fit. Find something that does and |
| 10583 | convert immediately. */ |
| 10584 | frag_offset = fr_opcode - fragP->fr_literal; |
| 10585 | istack_init (&istack); |
| 10586 | xg_assembly_relax (&istack, &orig_tinsn, |
| 10587 | segP, fragP, frag_offset, min_steps, 0); |
| 10588 | |
| 10589 | old_size = xtensa_format_length (isa, fmt); |
| 10590 | |
| 10591 | /* Assemble this right inline. */ |
| 10592 | |
| 10593 | /* First, create the mapping from a label name to the REAL label. */ |
| 10594 | target_offset = 0; |
| 10595 | for (i = 0; i < istack.ninsn; i++) |
| 10596 | { |
| 10597 | TInsn *tinsn = &istack.insn[i]; |
| 10598 | fragS *lit_frag; |
| 10599 | |
| 10600 | switch (tinsn->insn_type) |
| 10601 | { |
| 10602 | case ITYPE_LITERAL: |
| 10603 | if (lit_sym != NULL) |
| 10604 | as_bad (_("multiple literals in expansion")); |
| 10605 | /* First find the appropriate space in the literal pool. */ |
| 10606 | lit_frag = fragP->tc_frag_data.literal_frags[slot]; |
| 10607 | if (lit_frag == NULL) |
| 10608 | as_bad (_("no registered fragment for literal")); |
| 10609 | if (tinsn->ntok != 1) |
| 10610 | as_bad (_("number of literal tokens != 1")); |
| 10611 | |
| 10612 | /* Set the literal symbol and add a fixup. */ |
| 10613 | lit_sym = lit_frag->fr_symbol; |
| 10614 | break; |
| 10615 | |
| 10616 | case ITYPE_LABEL: |
| 10617 | if (align_targets && !is_loop) |
| 10618 | { |
| 10619 | fragS *unreach = fragP->fr_next; |
| 10620 | while (!(unreach->fr_type == rs_machine_dependent |
| 10621 | && (unreach->fr_subtype == RELAX_MAYBE_UNREACHABLE |
| 10622 | || unreach->fr_subtype == RELAX_UNREACHABLE))) |
| 10623 | { |
| 10624 | unreach = unreach->fr_next; |
| 10625 | } |
| 10626 | |
| 10627 | gas_assert (unreach->fr_type == rs_machine_dependent |
| 10628 | && (unreach->fr_subtype == RELAX_MAYBE_UNREACHABLE |
| 10629 | || unreach->fr_subtype == RELAX_UNREACHABLE)); |
| 10630 | |
| 10631 | target_offset += unreach->tc_frag_data.text_expansion[0]; |
| 10632 | } |
| 10633 | gas_assert (gen_label == NULL); |
| 10634 | gen_label = symbol_new (FAKE_LABEL_NAME, now_seg, |
| 10635 | fr_opcode - fragP->fr_literal |
| 10636 | + target_offset, fragP); |
| 10637 | break; |
| 10638 | |
| 10639 | case ITYPE_INSN: |
| 10640 | if (first && from_wide_insn) |
| 10641 | { |
| 10642 | target_offset += xtensa_format_length (isa, fmt); |
| 10643 | first = FALSE; |
| 10644 | if (!opcode_fits_format_slot (tinsn->opcode, fmt, slot)) |
| 10645 | target_offset += xg_get_single_size (tinsn->opcode); |
| 10646 | } |
| 10647 | else |
| 10648 | target_offset += xg_get_single_size (tinsn->opcode); |
| 10649 | break; |
| 10650 | } |
| 10651 | } |
| 10652 | |
| 10653 | total_size = 0; |
| 10654 | first = TRUE; |
| 10655 | for (i = 0; i < istack.ninsn; i++) |
| 10656 | { |
| 10657 | TInsn *tinsn = &istack.insn[i]; |
| 10658 | fragS *lit_frag; |
| 10659 | int size; |
| 10660 | segT target_seg; |
| 10661 | bfd_reloc_code_real_type reloc_type; |
| 10662 | |
| 10663 | switch (tinsn->insn_type) |
| 10664 | { |
| 10665 | case ITYPE_LITERAL: |
| 10666 | lit_frag = fragP->tc_frag_data.literal_frags[slot]; |
| 10667 | /* Already checked. */ |
| 10668 | gas_assert (lit_frag != NULL); |
| 10669 | gas_assert (lit_sym != NULL); |
| 10670 | gas_assert (tinsn->ntok == 1); |
| 10671 | /* Add a fixup. */ |
| 10672 | target_seg = S_GET_SEGMENT (lit_sym); |
| 10673 | gas_assert (target_seg); |
| 10674 | reloc_type = map_operator_to_reloc (tinsn->tok[0].X_op, TRUE); |
| 10675 | fix_new_exp_in_seg (target_seg, 0, lit_frag, 0, 4, |
| 10676 | &tinsn->tok[0], FALSE, reloc_type); |
| 10677 | break; |
| 10678 | |
| 10679 | case ITYPE_LABEL: |
| 10680 | break; |
| 10681 | |
| 10682 | case ITYPE_INSN: |
| 10683 | xg_resolve_labels (tinsn, gen_label); |
| 10684 | xg_resolve_literals (tinsn, lit_sym); |
| 10685 | if (from_wide_insn && first) |
| 10686 | { |
| 10687 | first = FALSE; |
| 10688 | if (opcode_fits_format_slot (tinsn->opcode, fmt, slot)) |
| 10689 | { |
| 10690 | cur_vinsn.slots[slot] = *tinsn; |
| 10691 | } |
| 10692 | else |
| 10693 | { |
| 10694 | cur_vinsn.slots[slot].opcode = |
| 10695 | xtensa_format_slot_nop_opcode (isa, fmt, slot); |
| 10696 | cur_vinsn.slots[slot].ntok = 0; |
| 10697 | } |
| 10698 | vinsn_to_insnbuf (&cur_vinsn, immed_instr, fragP, TRUE); |
| 10699 | xtensa_insnbuf_to_chars (isa, cur_vinsn.insnbuf, |
| 10700 | (unsigned char *) immed_instr, 0); |
| 10701 | fragP->tc_frag_data.is_insn = TRUE; |
| 10702 | size = xtensa_format_length (isa, fmt); |
| 10703 | if (!opcode_fits_format_slot (tinsn->opcode, fmt, slot)) |
| 10704 | { |
| 10705 | xg_emit_insn_to_buf |
| 10706 | (tinsn, immed_instr + size, fragP, |
| 10707 | immed_instr - fragP->fr_literal + size, TRUE); |
| 10708 | size += xg_get_single_size (tinsn->opcode); |
| 10709 | } |
| 10710 | } |
| 10711 | else |
| 10712 | { |
| 10713 | size = xg_get_single_size (tinsn->opcode); |
| 10714 | xg_emit_insn_to_buf (tinsn, immed_instr, fragP, |
| 10715 | immed_instr - fragP->fr_literal, TRUE); |
| 10716 | } |
| 10717 | immed_instr += size; |
| 10718 | total_size += size; |
| 10719 | break; |
| 10720 | } |
| 10721 | } |
| 10722 | |
| 10723 | diff = total_size - old_size; |
| 10724 | gas_assert (diff >= 0); |
| 10725 | if (diff != 0) |
| 10726 | expanded = TRUE; |
| 10727 | gas_assert (diff <= fragP->fr_var); |
| 10728 | fragP->fr_var -= diff; |
| 10729 | fragP->fr_fix += diff; |
| 10730 | } |
| 10731 | |
| 10732 | /* Check for undefined immediates in LOOP instructions. */ |
| 10733 | if (is_loop) |
| 10734 | { |
| 10735 | symbolS *sym; |
| 10736 | sym = orig_tinsn.tok[1].X_add_symbol; |
| 10737 | if (sym != NULL && !S_IS_DEFINED (sym)) |
| 10738 | { |
| 10739 | as_bad (_("unresolved loop target symbol: %s"), S_GET_NAME (sym)); |
| 10740 | return; |
| 10741 | } |
| 10742 | sym = orig_tinsn.tok[1].X_op_symbol; |
| 10743 | if (sym != NULL && !S_IS_DEFINED (sym)) |
| 10744 | { |
| 10745 | as_bad (_("unresolved loop target symbol: %s"), S_GET_NAME (sym)); |
| 10746 | return; |
| 10747 | } |
| 10748 | } |
| 10749 | |
| 10750 | if (expanded && xtensa_opcode_is_loop (isa, orig_tinsn.opcode) == 1) |
| 10751 | convert_frag_immed_finish_loop (segP, fragP, &orig_tinsn); |
| 10752 | |
| 10753 | if (expanded && is_direct_call_opcode (orig_tinsn.opcode)) |
| 10754 | { |
| 10755 | /* Add an expansion note on the expanded instruction. */ |
| 10756 | fix_new_exp_in_seg (now_seg, 0, fragP, fr_opcode - fragP->fr_literal, 4, |
| 10757 | &orig_tinsn.tok[0], TRUE, |
| 10758 | BFD_RELOC_XTENSA_ASM_EXPAND); |
| 10759 | } |
| 10760 | } |
| 10761 | |
| 10762 | |
| 10763 | /* Add a new fix expression into the desired segment. We have to |
| 10764 | switch to that segment to do this. */ |
| 10765 | |
| 10766 | static fixS * |
| 10767 | fix_new_exp_in_seg (segT new_seg, |
| 10768 | subsegT new_subseg, |
| 10769 | fragS *frag, |
| 10770 | int where, |
| 10771 | int size, |
| 10772 | expressionS *exp, |
| 10773 | int pcrel, |
| 10774 | bfd_reloc_code_real_type r_type) |
| 10775 | { |
| 10776 | fixS *new_fix; |
| 10777 | segT seg = now_seg; |
| 10778 | subsegT subseg = now_subseg; |
| 10779 | |
| 10780 | gas_assert (new_seg != 0); |
| 10781 | subseg_set (new_seg, new_subseg); |
| 10782 | |
| 10783 | new_fix = fix_new_exp (frag, where, size, exp, pcrel, r_type); |
| 10784 | subseg_set (seg, subseg); |
| 10785 | return new_fix; |
| 10786 | } |
| 10787 | |
| 10788 | |
| 10789 | /* Relax a loop instruction so that it can span loop >256 bytes. |
| 10790 | |
| 10791 | loop as, .L1 |
| 10792 | .L0: |
| 10793 | rsr as, LEND |
| 10794 | wsr as, LBEG |
| 10795 | addi as, as, lo8 (label-.L1) |
| 10796 | addmi as, as, mid8 (label-.L1) |
| 10797 | wsr as, LEND |
| 10798 | isync |
| 10799 | rsr as, LCOUNT |
| 10800 | addi as, as, 1 |
| 10801 | .L1: |
| 10802 | <<body>> |
| 10803 | label: |
| 10804 | */ |
| 10805 | |
| 10806 | static void |
| 10807 | convert_frag_immed_finish_loop (segT segP, fragS *fragP, TInsn *tinsn) |
| 10808 | { |
| 10809 | TInsn loop_insn; |
| 10810 | TInsn addi_insn; |
| 10811 | TInsn addmi_insn; |
| 10812 | unsigned long target; |
| 10813 | static xtensa_insnbuf insnbuf = NULL; |
| 10814 | unsigned int loop_length, loop_length_hi, loop_length_lo; |
| 10815 | xtensa_isa isa = xtensa_default_isa; |
| 10816 | addressT loop_offset; |
| 10817 | addressT addi_offset = 9; |
| 10818 | addressT addmi_offset = 12; |
| 10819 | fragS *next_fragP; |
| 10820 | int target_count; |
| 10821 | |
| 10822 | if (!insnbuf) |
| 10823 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 10824 | |
| 10825 | /* Get the loop offset. */ |
| 10826 | loop_offset = get_expanded_loop_offset (tinsn->opcode); |
| 10827 | |
| 10828 | /* Validate that there really is a LOOP at the loop_offset. Because |
| 10829 | loops are not bundleable, we can assume that the instruction will be |
| 10830 | in slot 0. */ |
| 10831 | tinsn_from_chars (&loop_insn, fragP->fr_opcode + loop_offset, 0); |
| 10832 | tinsn_immed_from_frag (&loop_insn, fragP, 0); |
| 10833 | |
| 10834 | gas_assert (xtensa_opcode_is_loop (isa, loop_insn.opcode) == 1); |
| 10835 | addi_offset += loop_offset; |
| 10836 | addmi_offset += loop_offset; |
| 10837 | |
| 10838 | gas_assert (tinsn->ntok == 2); |
| 10839 | if (tinsn->tok[1].X_op == O_constant) |
| 10840 | target = tinsn->tok[1].X_add_number; |
| 10841 | else if (tinsn->tok[1].X_op == O_symbol) |
| 10842 | { |
| 10843 | /* Find the fragment. */ |
| 10844 | symbolS *sym = tinsn->tok[1].X_add_symbol; |
| 10845 | gas_assert (S_GET_SEGMENT (sym) == segP |
| 10846 | || S_GET_SEGMENT (sym) == absolute_section); |
| 10847 | target = (S_GET_VALUE (sym) + tinsn->tok[1].X_add_number); |
| 10848 | } |
| 10849 | else |
| 10850 | { |
| 10851 | as_bad (_("invalid expression evaluation type %d"), tinsn->tok[1].X_op); |
| 10852 | target = 0; |
| 10853 | } |
| 10854 | |
| 10855 | loop_length = target - (fragP->fr_address + fragP->fr_fix); |
| 10856 | loop_length_hi = loop_length & ~0x0ff; |
| 10857 | loop_length_lo = loop_length & 0x0ff; |
| 10858 | if (loop_length_lo >= 128) |
| 10859 | { |
| 10860 | loop_length_lo -= 256; |
| 10861 | loop_length_hi += 256; |
| 10862 | } |
| 10863 | |
| 10864 | /* Because addmi sign-extends the immediate, 'loop_length_hi' can be at most |
| 10865 | 32512. If the loop is larger than that, then we just fail. */ |
| 10866 | if (loop_length_hi > 32512) |
| 10867 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 10868 | _("loop too long for LOOP instruction")); |
| 10869 | |
| 10870 | tinsn_from_chars (&addi_insn, fragP->fr_opcode + addi_offset, 0); |
| 10871 | gas_assert (addi_insn.opcode == xtensa_addi_opcode); |
| 10872 | |
| 10873 | tinsn_from_chars (&addmi_insn, fragP->fr_opcode + addmi_offset, 0); |
| 10874 | gas_assert (addmi_insn.opcode == xtensa_addmi_opcode); |
| 10875 | |
| 10876 | set_expr_const (&addi_insn.tok[2], loop_length_lo); |
| 10877 | tinsn_to_insnbuf (&addi_insn, insnbuf); |
| 10878 | |
| 10879 | fragP->tc_frag_data.is_insn = TRUE; |
| 10880 | xtensa_insnbuf_to_chars |
| 10881 | (isa, insnbuf, (unsigned char *) fragP->fr_opcode + addi_offset, 0); |
| 10882 | |
| 10883 | set_expr_const (&addmi_insn.tok[2], loop_length_hi); |
| 10884 | tinsn_to_insnbuf (&addmi_insn, insnbuf); |
| 10885 | xtensa_insnbuf_to_chars |
| 10886 | (isa, insnbuf, (unsigned char *) fragP->fr_opcode + addmi_offset, 0); |
| 10887 | |
| 10888 | /* Walk through all of the frags from here to the loop end |
| 10889 | and mark them as no_transform to keep them from being modified |
| 10890 | by the linker. If we ever have a relocation for the |
| 10891 | addi/addmi of the difference of two symbols we can remove this. */ |
| 10892 | |
| 10893 | target_count = 0; |
| 10894 | for (next_fragP = fragP; next_fragP != NULL; |
| 10895 | next_fragP = next_fragP->fr_next) |
| 10896 | { |
| 10897 | next_fragP->tc_frag_data.is_no_transform = TRUE; |
| 10898 | if (next_fragP->tc_frag_data.is_loop_target) |
| 10899 | target_count++; |
| 10900 | if (target_count == 2) |
| 10901 | break; |
| 10902 | } |
| 10903 | } |
| 10904 | |
| 10905 | \f |
| 10906 | /* A map that keeps information on a per-subsegment basis. This is |
| 10907 | maintained during initial assembly, but is invalid once the |
| 10908 | subsegments are smashed together. I.E., it cannot be used during |
| 10909 | the relaxation. */ |
| 10910 | |
| 10911 | typedef struct subseg_map_struct |
| 10912 | { |
| 10913 | /* the key */ |
| 10914 | segT seg; |
| 10915 | subsegT subseg; |
| 10916 | |
| 10917 | /* the data */ |
| 10918 | unsigned flags; |
| 10919 | float total_freq; /* fall-through + branch target frequency */ |
| 10920 | float target_freq; /* branch target frequency alone */ |
| 10921 | |
| 10922 | struct subseg_map_struct *next; |
| 10923 | } subseg_map; |
| 10924 | |
| 10925 | |
| 10926 | static subseg_map *sseg_map = NULL; |
| 10927 | |
| 10928 | static subseg_map * |
| 10929 | get_subseg_info (segT seg, subsegT subseg) |
| 10930 | { |
| 10931 | subseg_map *subseg_e; |
| 10932 | |
| 10933 | for (subseg_e = sseg_map; subseg_e; subseg_e = subseg_e->next) |
| 10934 | { |
| 10935 | if (seg == subseg_e->seg && subseg == subseg_e->subseg) |
| 10936 | break; |
| 10937 | } |
| 10938 | return subseg_e; |
| 10939 | } |
| 10940 | |
| 10941 | |
| 10942 | static subseg_map * |
| 10943 | add_subseg_info (segT seg, subsegT subseg) |
| 10944 | { |
| 10945 | subseg_map *subseg_e = (subseg_map *) xmalloc (sizeof (subseg_map)); |
| 10946 | memset (subseg_e, 0, sizeof (subseg_map)); |
| 10947 | subseg_e->seg = seg; |
| 10948 | subseg_e->subseg = subseg; |
| 10949 | subseg_e->flags = 0; |
| 10950 | /* Start off considering every branch target very important. */ |
| 10951 | subseg_e->target_freq = 1.0; |
| 10952 | subseg_e->total_freq = 1.0; |
| 10953 | subseg_e->next = sseg_map; |
| 10954 | sseg_map = subseg_e; |
| 10955 | return subseg_e; |
| 10956 | } |
| 10957 | |
| 10958 | |
| 10959 | static unsigned |
| 10960 | get_last_insn_flags (segT seg, subsegT subseg) |
| 10961 | { |
| 10962 | subseg_map *subseg_e = get_subseg_info (seg, subseg); |
| 10963 | if (subseg_e) |
| 10964 | return subseg_e->flags; |
| 10965 | return 0; |
| 10966 | } |
| 10967 | |
| 10968 | |
| 10969 | static void |
| 10970 | set_last_insn_flags (segT seg, |
| 10971 | subsegT subseg, |
| 10972 | unsigned fl, |
| 10973 | bfd_boolean val) |
| 10974 | { |
| 10975 | subseg_map *subseg_e = get_subseg_info (seg, subseg); |
| 10976 | if (! subseg_e) |
| 10977 | subseg_e = add_subseg_info (seg, subseg); |
| 10978 | if (val) |
| 10979 | subseg_e->flags |= fl; |
| 10980 | else |
| 10981 | subseg_e->flags &= ~fl; |
| 10982 | } |
| 10983 | |
| 10984 | |
| 10985 | static float |
| 10986 | get_subseg_total_freq (segT seg, subsegT subseg) |
| 10987 | { |
| 10988 | subseg_map *subseg_e = get_subseg_info (seg, subseg); |
| 10989 | if (subseg_e) |
| 10990 | return subseg_e->total_freq; |
| 10991 | return 1.0; |
| 10992 | } |
| 10993 | |
| 10994 | |
| 10995 | static float |
| 10996 | get_subseg_target_freq (segT seg, subsegT subseg) |
| 10997 | { |
| 10998 | subseg_map *subseg_e = get_subseg_info (seg, subseg); |
| 10999 | if (subseg_e) |
| 11000 | return subseg_e->target_freq; |
| 11001 | return 1.0; |
| 11002 | } |
| 11003 | |
| 11004 | |
| 11005 | static void |
| 11006 | set_subseg_freq (segT seg, subsegT subseg, float total_f, float target_f) |
| 11007 | { |
| 11008 | subseg_map *subseg_e = get_subseg_info (seg, subseg); |
| 11009 | if (! subseg_e) |
| 11010 | subseg_e = add_subseg_info (seg, subseg); |
| 11011 | subseg_e->total_freq = total_f; |
| 11012 | subseg_e->target_freq = target_f; |
| 11013 | } |
| 11014 | |
| 11015 | \f |
| 11016 | /* Segment Lists and emit_state Stuff. */ |
| 11017 | |
| 11018 | static void |
| 11019 | xtensa_move_seg_list_to_beginning (seg_list *head) |
| 11020 | { |
| 11021 | head = head->next; |
| 11022 | while (head) |
| 11023 | { |
| 11024 | segT literal_section = head->seg; |
| 11025 | |
| 11026 | /* Move the literal section to the front of the section list. */ |
| 11027 | gas_assert (literal_section); |
| 11028 | if (literal_section != stdoutput->sections) |
| 11029 | { |
| 11030 | bfd_section_list_remove (stdoutput, literal_section); |
| 11031 | bfd_section_list_prepend (stdoutput, literal_section); |
| 11032 | } |
| 11033 | head = head->next; |
| 11034 | } |
| 11035 | } |
| 11036 | |
| 11037 | |
| 11038 | static void mark_literal_frags (seg_list *); |
| 11039 | |
| 11040 | static void |
| 11041 | xtensa_move_literals (void) |
| 11042 | { |
| 11043 | seg_list *segment; |
| 11044 | frchainS *frchain_from, *frchain_to; |
| 11045 | fragS *search_frag, *next_frag, *literal_pool, *insert_after; |
| 11046 | fragS **frag_splice; |
| 11047 | emit_state state; |
| 11048 | segT dest_seg; |
| 11049 | fixS *fix, *next_fix, **fix_splice; |
| 11050 | sym_list *lit; |
| 11051 | struct litpool_seg *lps; |
| 11052 | const char *init_name = INIT_SECTION_NAME; |
| 11053 | const char *fini_name = FINI_SECTION_NAME; |
| 11054 | int init_name_len = strlen(init_name); |
| 11055 | int fini_name_len = strlen(fini_name); |
| 11056 | |
| 11057 | mark_literal_frags (literal_head->next); |
| 11058 | |
| 11059 | if (use_literal_section) |
| 11060 | return; |
| 11061 | |
| 11062 | /* Assign addresses (rough estimates) to the potential literal pool locations |
| 11063 | and create new ones if the gaps are too large. */ |
| 11064 | |
| 11065 | for (lps = litpool_seg_list.next; lps; lps = lps->next) |
| 11066 | { |
| 11067 | frchainS *frchP = seg_info (lps->seg)->frchainP; |
| 11068 | struct litpool_frag *lpf = lps->frag_list.next; |
| 11069 | addressT addr = 0; |
| 11070 | |
| 11071 | for ( ; frchP; frchP = frchP->frch_next) |
| 11072 | { |
| 11073 | fragS *fragP; |
| 11074 | for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next) |
| 11075 | { |
| 11076 | if (lpf && fragP == lpf->fragP) |
| 11077 | { |
| 11078 | gas_assert(fragP->fr_type == rs_machine_dependent && |
| 11079 | (fragP->fr_subtype == RELAX_LITERAL_POOL_BEGIN || |
| 11080 | fragP->fr_subtype == RELAX_LITERAL_POOL_CANDIDATE_BEGIN)); |
| 11081 | /* Found a litpool location. */ |
| 11082 | lpf->addr = addr; |
| 11083 | lpf = lpf->next; |
| 11084 | } |
| 11085 | if (fragP->fr_type == rs_machine_dependent && |
| 11086 | fragP->fr_subtype == RELAX_SLOTS) |
| 11087 | { |
| 11088 | int slot; |
| 11089 | for (slot = 0; slot < MAX_SLOTS; slot++) |
| 11090 | { |
| 11091 | if (fragP->tc_frag_data.literal_frags[slot]) |
| 11092 | { |
| 11093 | /* L32R; point its literal to the nearest litpool |
| 11094 | preferring non-"candidate" positions to avoid |
| 11095 | the jump-around. */ |
| 11096 | fragS *litfrag = fragP->tc_frag_data.literal_frags[slot]; |
| 11097 | struct litpool_frag *lp = lpf->prev; |
| 11098 | if (!lp->fragP) |
| 11099 | { |
| 11100 | break; |
| 11101 | } |
| 11102 | while (lp->fragP->fr_subtype == |
| 11103 | RELAX_LITERAL_POOL_CANDIDATE_BEGIN) |
| 11104 | { |
| 11105 | lp = lp->prev; |
| 11106 | if (lp->fragP == NULL) |
| 11107 | { |
| 11108 | /* End of list; have to bite the bullet. |
| 11109 | Take the nearest. */ |
| 11110 | lp = lpf->prev; |
| 11111 | break; |
| 11112 | } |
| 11113 | /* Does it (conservatively) reach? */ |
| 11114 | if (addr - lp->addr <= 128 * 1024) |
| 11115 | { |
| 11116 | if (lp->fragP->fr_subtype == RELAX_LITERAL_POOL_BEGIN) |
| 11117 | { |
| 11118 | /* Found a good one. */ |
| 11119 | break; |
| 11120 | } |
| 11121 | else if (lp->prev->fragP && |
| 11122 | addr - lp->prev->addr > 128 * 1024) |
| 11123 | { |
| 11124 | /* This is still a "candidate" but the next one |
| 11125 | will be too far away, so revert to the nearest |
| 11126 | one, convert it and add the jump around. */ |
| 11127 | fragS *poolbeg; |
| 11128 | fragS *poolend; |
| 11129 | symbolS *lsym; |
| 11130 | char label[10 + 2 * sizeof (fragS *)]; |
| 11131 | lp = lpf->prev; |
| 11132 | poolbeg = lp->fragP; |
| 11133 | lp->priority = 1; |
| 11134 | poolbeg->fr_subtype = RELAX_LITERAL_POOL_BEGIN; |
| 11135 | poolend = poolbeg->fr_next; |
| 11136 | gas_assert (poolend->fr_type == rs_machine_dependent && |
| 11137 | poolend->fr_subtype == RELAX_LITERAL_POOL_END); |
| 11138 | /* Create a local symbol pointing to the |
| 11139 | end of the pool. */ |
| 11140 | sprintf (label, ".L0_LT_%p", poolbeg); |
| 11141 | lsym = (symbolS *)local_symbol_make (label, lps->seg, |
| 11142 | 0, poolend); |
| 11143 | poolbeg->fr_symbol = lsym; |
| 11144 | /* Rest is done in xtensa_relax_frag. */ |
| 11145 | } |
| 11146 | } |
| 11147 | } |
| 11148 | if (! litfrag->tc_frag_data.literal_frag) |
| 11149 | { |
| 11150 | /* Take earliest use of this literal to avoid |
| 11151 | forward refs. */ |
| 11152 | litfrag->tc_frag_data.literal_frag = lp->fragP; |
| 11153 | } |
| 11154 | } |
| 11155 | } |
| 11156 | } |
| 11157 | addr += fragP->fr_fix; |
| 11158 | if (fragP->fr_type == rs_fill) |
| 11159 | addr += fragP->fr_offset; |
| 11160 | } |
| 11161 | } |
| 11162 | } |
| 11163 | |
| 11164 | for (segment = literal_head->next; segment; segment = segment->next) |
| 11165 | { |
| 11166 | const char *seg_name = segment_name (segment->seg); |
| 11167 | |
| 11168 | /* Keep the literals for .init and .fini in separate sections. */ |
| 11169 | if ((!memcmp (seg_name, init_name, init_name_len) && |
| 11170 | !strcmp (seg_name + init_name_len, ".literal")) || |
| 11171 | (!memcmp (seg_name, fini_name, fini_name_len) && |
| 11172 | !strcmp (seg_name + fini_name_len, ".literal"))) |
| 11173 | continue; |
| 11174 | |
| 11175 | frchain_from = seg_info (segment->seg)->frchainP; |
| 11176 | search_frag = frchain_from->frch_root; |
| 11177 | literal_pool = NULL; |
| 11178 | frchain_to = NULL; |
| 11179 | frag_splice = &(frchain_from->frch_root); |
| 11180 | |
| 11181 | while (search_frag && !search_frag->tc_frag_data.literal_frag) |
| 11182 | { |
| 11183 | gas_assert (search_frag->fr_fix == 0 |
| 11184 | || search_frag->fr_type == rs_align); |
| 11185 | search_frag = search_frag->fr_next; |
| 11186 | } |
| 11187 | |
| 11188 | if (!search_frag) |
| 11189 | { |
| 11190 | search_frag = frchain_from->frch_root; |
| 11191 | as_bad_where (search_frag->fr_file, search_frag->fr_line, |
| 11192 | _("literal pool location required for text-section-literals; specify with .literal_position")); |
| 11193 | continue; |
| 11194 | } |
| 11195 | |
| 11196 | gas_assert (search_frag->tc_frag_data.literal_frag->fr_subtype |
| 11197 | == RELAX_LITERAL_POOL_BEGIN); |
| 11198 | xtensa_switch_section_emit_state (&state, segment->seg, 0); |
| 11199 | |
| 11200 | /* Make sure that all the frags in this series are closed, and |
| 11201 | that there is at least one left over of zero-size. This |
| 11202 | prevents us from making a segment with an frchain without any |
| 11203 | frags in it. */ |
| 11204 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 11205 | xtensa_set_frag_assembly_state (frag_now); |
| 11206 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 11207 | xtensa_set_frag_assembly_state (frag_now); |
| 11208 | |
| 11209 | while (search_frag != frag_now) |
| 11210 | { |
| 11211 | next_frag = search_frag->fr_next; |
| 11212 | if (search_frag->tc_frag_data.literal_frag) |
| 11213 | { |
| 11214 | literal_pool = search_frag->tc_frag_data.literal_frag; |
| 11215 | gas_assert (literal_pool->fr_subtype == RELAX_LITERAL_POOL_BEGIN); |
| 11216 | frchain_to = literal_pool->tc_frag_data.lit_frchain; |
| 11217 | gas_assert (frchain_to); |
| 11218 | } |
| 11219 | |
| 11220 | if (search_frag->fr_type == rs_fill && search_frag->fr_fix == 0) |
| 11221 | { |
| 11222 | /* Skip empty fill frags. */ |
| 11223 | *frag_splice = next_frag; |
| 11224 | search_frag = next_frag; |
| 11225 | continue; |
| 11226 | } |
| 11227 | |
| 11228 | if (search_frag->fr_type == rs_align) |
| 11229 | { |
| 11230 | /* Skip alignment frags, because the pool as a whole will be |
| 11231 | aligned if used, and we don't want to force alignment if the |
| 11232 | pool is unused. */ |
| 11233 | *frag_splice = next_frag; |
| 11234 | search_frag = next_frag; |
| 11235 | continue; |
| 11236 | } |
| 11237 | |
| 11238 | /* First, move the frag out of the literal section and |
| 11239 | to the appropriate place. */ |
| 11240 | |
| 11241 | /* Insert an aligmnent frag at start of pool. */ |
| 11242 | if (literal_pool->fr_next->fr_type == rs_machine_dependent && |
| 11243 | literal_pool->fr_next->fr_subtype == RELAX_LITERAL_POOL_END) |
| 11244 | { |
| 11245 | segT pool_seg = literal_pool->fr_next->tc_frag_data.lit_seg; |
| 11246 | emit_state prev_state; |
| 11247 | fragS *prev_frag; |
| 11248 | fragS *align_frag; |
| 11249 | xtensa_switch_section_emit_state (&prev_state, pool_seg, 0); |
| 11250 | prev_frag = frag_now; |
| 11251 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 11252 | align_frag = frag_now; |
| 11253 | frag_align (2, 0, 0); |
| 11254 | /* Splice it into the right place. */ |
| 11255 | prev_frag->fr_next = align_frag->fr_next; |
| 11256 | align_frag->fr_next = literal_pool->fr_next; |
| 11257 | literal_pool->fr_next = align_frag; |
| 11258 | /* Insert after this one. */ |
| 11259 | literal_pool->tc_frag_data.literal_frag = align_frag; |
| 11260 | xtensa_restore_emit_state (&prev_state); |
| 11261 | } |
| 11262 | insert_after = literal_pool->tc_frag_data.literal_frag; |
| 11263 | dest_seg = insert_after->fr_next->tc_frag_data.lit_seg; |
| 11264 | /* Skip align frag. */ |
| 11265 | if (insert_after->fr_next->fr_type == rs_align) |
| 11266 | { |
| 11267 | insert_after = insert_after->fr_next; |
| 11268 | } |
| 11269 | |
| 11270 | *frag_splice = next_frag; |
| 11271 | search_frag->fr_next = insert_after->fr_next; |
| 11272 | insert_after->fr_next = search_frag; |
| 11273 | search_frag->tc_frag_data.lit_seg = dest_seg; |
| 11274 | literal_pool->tc_frag_data.literal_frag = search_frag; |
| 11275 | |
| 11276 | /* Now move any fixups associated with this frag to the |
| 11277 | right section. */ |
| 11278 | fix = frchain_from->fix_root; |
| 11279 | fix_splice = &(frchain_from->fix_root); |
| 11280 | while (fix) |
| 11281 | { |
| 11282 | next_fix = fix->fx_next; |
| 11283 | if (fix->fx_frag == search_frag) |
| 11284 | { |
| 11285 | *fix_splice = next_fix; |
| 11286 | fix->fx_next = frchain_to->fix_root; |
| 11287 | frchain_to->fix_root = fix; |
| 11288 | if (frchain_to->fix_tail == NULL) |
| 11289 | frchain_to->fix_tail = fix; |
| 11290 | } |
| 11291 | else |
| 11292 | fix_splice = &(fix->fx_next); |
| 11293 | fix = next_fix; |
| 11294 | } |
| 11295 | search_frag = next_frag; |
| 11296 | } |
| 11297 | |
| 11298 | if (frchain_from->fix_root != NULL) |
| 11299 | { |
| 11300 | frchain_from = seg_info (segment->seg)->frchainP; |
| 11301 | as_warn (_("fixes not all moved from %s"), segment->seg->name); |
| 11302 | |
| 11303 | gas_assert (frchain_from->fix_root == NULL); |
| 11304 | } |
| 11305 | frchain_from->fix_tail = NULL; |
| 11306 | xtensa_restore_emit_state (&state); |
| 11307 | } |
| 11308 | |
| 11309 | /* Now fix up the SEGMENT value for all the literal symbols. */ |
| 11310 | for (lit = literal_syms; lit; lit = lit->next) |
| 11311 | { |
| 11312 | symbolS *lit_sym = lit->sym; |
| 11313 | segT dseg = symbol_get_frag (lit_sym)->tc_frag_data.lit_seg; |
| 11314 | if (dseg) |
| 11315 | S_SET_SEGMENT (lit_sym, dseg); |
| 11316 | } |
| 11317 | } |
| 11318 | |
| 11319 | |
| 11320 | /* Walk over all the frags for segments in a list and mark them as |
| 11321 | containing literals. As clunky as this is, we can't rely on frag_var |
| 11322 | and frag_variant to get called in all situations. */ |
| 11323 | |
| 11324 | static void |
| 11325 | mark_literal_frags (seg_list *segment) |
| 11326 | { |
| 11327 | frchainS *frchain_from; |
| 11328 | fragS *search_frag; |
| 11329 | |
| 11330 | while (segment) |
| 11331 | { |
| 11332 | frchain_from = seg_info (segment->seg)->frchainP; |
| 11333 | search_frag = frchain_from->frch_root; |
| 11334 | while (search_frag) |
| 11335 | { |
| 11336 | search_frag->tc_frag_data.is_literal = TRUE; |
| 11337 | search_frag = search_frag->fr_next; |
| 11338 | } |
| 11339 | segment = segment->next; |
| 11340 | } |
| 11341 | } |
| 11342 | |
| 11343 | |
| 11344 | static void |
| 11345 | xtensa_reorder_seg_list (seg_list *head, segT after) |
| 11346 | { |
| 11347 | /* Move all of the sections in the section list to come |
| 11348 | after "after" in the gnu segment list. */ |
| 11349 | |
| 11350 | head = head->next; |
| 11351 | while (head) |
| 11352 | { |
| 11353 | segT literal_section = head->seg; |
| 11354 | |
| 11355 | /* Move the literal section after "after". */ |
| 11356 | gas_assert (literal_section); |
| 11357 | if (literal_section != after) |
| 11358 | { |
| 11359 | bfd_section_list_remove (stdoutput, literal_section); |
| 11360 | bfd_section_list_insert_after (stdoutput, after, literal_section); |
| 11361 | } |
| 11362 | |
| 11363 | head = head->next; |
| 11364 | } |
| 11365 | } |
| 11366 | |
| 11367 | |
| 11368 | /* Push all the literal segments to the end of the gnu list. */ |
| 11369 | |
| 11370 | static void |
| 11371 | xtensa_reorder_segments (void) |
| 11372 | { |
| 11373 | segT sec; |
| 11374 | segT last_sec = 0; |
| 11375 | int old_count = 0; |
| 11376 | int new_count = 0; |
| 11377 | |
| 11378 | for (sec = stdoutput->sections; sec != NULL; sec = sec->next) |
| 11379 | { |
| 11380 | last_sec = sec; |
| 11381 | old_count++; |
| 11382 | } |
| 11383 | |
| 11384 | /* Now that we have the last section, push all the literal |
| 11385 | sections to the end. */ |
| 11386 | xtensa_reorder_seg_list (literal_head, last_sec); |
| 11387 | |
| 11388 | /* Now perform the final error check. */ |
| 11389 | for (sec = stdoutput->sections; sec != NULL; sec = sec->next) |
| 11390 | new_count++; |
| 11391 | gas_assert (new_count == old_count); |
| 11392 | } |
| 11393 | |
| 11394 | |
| 11395 | /* Change the emit state (seg, subseg, and frag related stuff) to the |
| 11396 | correct location. Return a emit_state which can be passed to |
| 11397 | xtensa_restore_emit_state to return to current fragment. */ |
| 11398 | |
| 11399 | static void |
| 11400 | xtensa_switch_to_literal_fragment (emit_state *result) |
| 11401 | { |
| 11402 | if (directive_state[directive_absolute_literals]) |
| 11403 | { |
| 11404 | segT lit4_seg = cache_literal_section (TRUE); |
| 11405 | xtensa_switch_section_emit_state (result, lit4_seg, 0); |
| 11406 | } |
| 11407 | else |
| 11408 | xtensa_switch_to_non_abs_literal_fragment (result); |
| 11409 | |
| 11410 | /* Do a 4-byte align here. */ |
| 11411 | frag_align (2, 0, 0); |
| 11412 | record_alignment (now_seg, 2); |
| 11413 | } |
| 11414 | |
| 11415 | |
| 11416 | static void |
| 11417 | xtensa_switch_to_non_abs_literal_fragment (emit_state *result) |
| 11418 | { |
| 11419 | static bfd_boolean recursive = FALSE; |
| 11420 | fragS *pool_location = get_literal_pool_location (now_seg); |
| 11421 | segT lit_seg; |
| 11422 | bfd_boolean is_init = |
| 11423 | (now_seg && !strcmp (segment_name (now_seg), INIT_SECTION_NAME)); |
| 11424 | bfd_boolean is_fini = |
| 11425 | (now_seg && !strcmp (segment_name (now_seg), FINI_SECTION_NAME)); |
| 11426 | |
| 11427 | if (pool_location == NULL |
| 11428 | && !use_literal_section |
| 11429 | && !recursive |
| 11430 | && !is_init && ! is_fini) |
| 11431 | { |
| 11432 | if (!auto_litpools) |
| 11433 | { |
| 11434 | as_bad (_("literal pool location required for text-section-literals; specify with .literal_position")); |
| 11435 | } |
| 11436 | |
| 11437 | /* When we mark a literal pool location, we want to put a frag in |
| 11438 | the literal pool that points to it. But to do that, we want to |
| 11439 | switch_to_literal_fragment. But literal sections don't have |
| 11440 | literal pools, so their location is always null, so we would |
| 11441 | recurse forever. This is kind of hacky, but it works. */ |
| 11442 | |
| 11443 | recursive = TRUE; |
| 11444 | xtensa_mark_literal_pool_location (); |
| 11445 | recursive = FALSE; |
| 11446 | } |
| 11447 | |
| 11448 | lit_seg = cache_literal_section (FALSE); |
| 11449 | xtensa_switch_section_emit_state (result, lit_seg, 0); |
| 11450 | |
| 11451 | if (!use_literal_section |
| 11452 | && !is_init && !is_fini |
| 11453 | && get_literal_pool_location (now_seg) != pool_location) |
| 11454 | { |
| 11455 | /* Close whatever frag is there. */ |
| 11456 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 11457 | xtensa_set_frag_assembly_state (frag_now); |
| 11458 | frag_now->tc_frag_data.literal_frag = pool_location; |
| 11459 | frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL); |
| 11460 | xtensa_set_frag_assembly_state (frag_now); |
| 11461 | } |
| 11462 | } |
| 11463 | |
| 11464 | |
| 11465 | /* Call this function before emitting data into the literal section. |
| 11466 | This is a helper function for xtensa_switch_to_literal_fragment. |
| 11467 | This is similar to a .section new_now_seg subseg. */ |
| 11468 | |
| 11469 | static void |
| 11470 | xtensa_switch_section_emit_state (emit_state *state, |
| 11471 | segT new_now_seg, |
| 11472 | subsegT new_now_subseg) |
| 11473 | { |
| 11474 | state->name = now_seg->name; |
| 11475 | state->now_seg = now_seg; |
| 11476 | state->now_subseg = now_subseg; |
| 11477 | state->generating_literals = generating_literals; |
| 11478 | generating_literals++; |
| 11479 | subseg_set (new_now_seg, new_now_subseg); |
| 11480 | } |
| 11481 | |
| 11482 | |
| 11483 | /* Use to restore the emitting into the normal place. */ |
| 11484 | |
| 11485 | static void |
| 11486 | xtensa_restore_emit_state (emit_state *state) |
| 11487 | { |
| 11488 | generating_literals = state->generating_literals; |
| 11489 | subseg_set (state->now_seg, state->now_subseg); |
| 11490 | } |
| 11491 | |
| 11492 | |
| 11493 | /* Predicate function used to look up a section in a particular group. */ |
| 11494 | |
| 11495 | static bfd_boolean |
| 11496 | match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf) |
| 11497 | { |
| 11498 | const char *gname = inf; |
| 11499 | const char *group_name = elf_group_name (sec); |
| 11500 | |
| 11501 | return (group_name == gname |
| 11502 | || (group_name != NULL |
| 11503 | && gname != NULL |
| 11504 | && strcmp (group_name, gname) == 0)); |
| 11505 | } |
| 11506 | |
| 11507 | |
| 11508 | /* Get the literal section to be used for the current text section. |
| 11509 | The result may be cached in the default_lit_sections structure. */ |
| 11510 | |
| 11511 | static segT |
| 11512 | cache_literal_section (bfd_boolean use_abs_literals) |
| 11513 | { |
| 11514 | const char *text_name, *group_name = 0; |
| 11515 | const char *base_name, *suffix; |
| 11516 | char *name; |
| 11517 | segT *pcached; |
| 11518 | segT seg, current_section; |
| 11519 | int current_subsec; |
| 11520 | bfd_boolean linkonce = FALSE; |
| 11521 | |
| 11522 | /* Save the current section/subsection. */ |
| 11523 | current_section = now_seg; |
| 11524 | current_subsec = now_subseg; |
| 11525 | |
| 11526 | /* Clear the cached values if they are no longer valid. */ |
| 11527 | if (now_seg != default_lit_sections.current_text_seg) |
| 11528 | { |
| 11529 | default_lit_sections.current_text_seg = now_seg; |
| 11530 | default_lit_sections.lit_seg = NULL; |
| 11531 | default_lit_sections.lit4_seg = NULL; |
| 11532 | } |
| 11533 | |
| 11534 | /* Check if the literal section is already cached. */ |
| 11535 | if (use_abs_literals) |
| 11536 | pcached = &default_lit_sections.lit4_seg; |
| 11537 | else |
| 11538 | pcached = &default_lit_sections.lit_seg; |
| 11539 | |
| 11540 | if (*pcached) |
| 11541 | return *pcached; |
| 11542 | |
| 11543 | text_name = default_lit_sections.lit_prefix; |
| 11544 | if (! text_name || ! *text_name) |
| 11545 | { |
| 11546 | text_name = segment_name (current_section); |
| 11547 | group_name = elf_group_name (current_section); |
| 11548 | linkonce = (current_section->flags & SEC_LINK_ONCE) != 0; |
| 11549 | } |
| 11550 | |
| 11551 | base_name = use_abs_literals ? ".lit4" : ".literal"; |
| 11552 | if (group_name) |
| 11553 | { |
| 11554 | name = concat (base_name, ".", group_name, (char *) NULL); |
| 11555 | } |
| 11556 | else if (strncmp (text_name, ".gnu.linkonce.", linkonce_len) == 0) |
| 11557 | { |
| 11558 | suffix = strchr (text_name + linkonce_len, '.'); |
| 11559 | |
| 11560 | name = concat (".gnu.linkonce", base_name, suffix ? suffix : "", |
| 11561 | (char *) NULL); |
| 11562 | linkonce = TRUE; |
| 11563 | } |
| 11564 | else |
| 11565 | { |
| 11566 | /* If the section name begins or ends with ".text", then replace |
| 11567 | that portion instead of appending an additional suffix. */ |
| 11568 | size_t len = strlen (text_name); |
| 11569 | if (len >= 5 |
| 11570 | && (strcmp (text_name + len - 5, ".text") == 0 |
| 11571 | || strncmp (text_name, ".text", 5) == 0)) |
| 11572 | len -= 5; |
| 11573 | |
| 11574 | name = xmalloc (len + strlen (base_name) + 1); |
| 11575 | if (strncmp (text_name, ".text", 5) == 0) |
| 11576 | { |
| 11577 | strcpy (name, base_name); |
| 11578 | strcat (name, text_name + 5); |
| 11579 | } |
| 11580 | else |
| 11581 | { |
| 11582 | strcpy (name, text_name); |
| 11583 | strcpy (name + len, base_name); |
| 11584 | } |
| 11585 | } |
| 11586 | |
| 11587 | /* Canonicalize section names to allow renaming literal sections. |
| 11588 | The group name, if any, came from the current text section and |
| 11589 | has already been canonicalized. */ |
| 11590 | name = tc_canonicalize_symbol_name (name); |
| 11591 | |
| 11592 | seg = bfd_get_section_by_name_if (stdoutput, name, match_section_group, |
| 11593 | (void *) group_name); |
| 11594 | if (! seg) |
| 11595 | { |
| 11596 | flagword flags; |
| 11597 | |
| 11598 | seg = subseg_force_new (name, 0); |
| 11599 | |
| 11600 | if (! use_abs_literals) |
| 11601 | { |
| 11602 | /* Add the newly created literal segment to the list. */ |
| 11603 | seg_list *n = (seg_list *) xmalloc (sizeof (seg_list)); |
| 11604 | n->seg = seg; |
| 11605 | n->next = literal_head->next; |
| 11606 | literal_head->next = n; |
| 11607 | } |
| 11608 | |
| 11609 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_ALLOC | SEC_LOAD |
| 11610 | | (linkonce ? (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD) : 0) |
| 11611 | | (use_abs_literals ? SEC_DATA : SEC_CODE)); |
| 11612 | |
| 11613 | elf_group_name (seg) = group_name; |
| 11614 | |
| 11615 | bfd_set_section_flags (stdoutput, seg, flags); |
| 11616 | bfd_set_section_alignment (stdoutput, seg, 2); |
| 11617 | } |
| 11618 | |
| 11619 | *pcached = seg; |
| 11620 | subseg_set (current_section, current_subsec); |
| 11621 | return seg; |
| 11622 | } |
| 11623 | |
| 11624 | \f |
| 11625 | /* Property Tables Stuff. */ |
| 11626 | |
| 11627 | #define XTENSA_INSN_SEC_NAME ".xt.insn" |
| 11628 | #define XTENSA_LIT_SEC_NAME ".xt.lit" |
| 11629 | #define XTENSA_PROP_SEC_NAME ".xt.prop" |
| 11630 | |
| 11631 | typedef bfd_boolean (*frag_predicate) (const fragS *); |
| 11632 | typedef void (*frag_flags_fn) (const fragS *, frag_flags *); |
| 11633 | |
| 11634 | static bfd_boolean get_frag_is_literal (const fragS *); |
| 11635 | static void xtensa_create_property_segments |
| 11636 | (frag_predicate, frag_predicate, const char *, xt_section_type); |
| 11637 | static void xtensa_create_xproperty_segments |
| 11638 | (frag_flags_fn, const char *, xt_section_type); |
| 11639 | static bfd_boolean exclude_section_from_property_tables (segT); |
| 11640 | static bfd_boolean section_has_property (segT, frag_predicate); |
| 11641 | static bfd_boolean section_has_xproperty (segT, frag_flags_fn); |
| 11642 | static void add_xt_block_frags |
| 11643 | (segT, xtensa_block_info **, frag_predicate, frag_predicate); |
| 11644 | static bfd_boolean xtensa_frag_flags_is_empty (const frag_flags *); |
| 11645 | static void xtensa_frag_flags_init (frag_flags *); |
| 11646 | static void get_frag_property_flags (const fragS *, frag_flags *); |
| 11647 | static flagword frag_flags_to_number (const frag_flags *); |
| 11648 | static void add_xt_prop_frags (segT, xtensa_block_info **, frag_flags_fn); |
| 11649 | |
| 11650 | /* Set up property tables after relaxation. */ |
| 11651 | |
| 11652 | void |
| 11653 | xtensa_post_relax_hook (void) |
| 11654 | { |
| 11655 | xtensa_move_seg_list_to_beginning (literal_head); |
| 11656 | |
| 11657 | xtensa_find_unmarked_state_frags (); |
| 11658 | xtensa_mark_frags_for_org (); |
| 11659 | xtensa_mark_difference_of_two_symbols (); |
| 11660 | |
| 11661 | xtensa_create_property_segments (get_frag_is_literal, |
| 11662 | NULL, |
| 11663 | XTENSA_LIT_SEC_NAME, |
| 11664 | xt_literal_sec); |
| 11665 | xtensa_create_xproperty_segments (get_frag_property_flags, |
| 11666 | XTENSA_PROP_SEC_NAME, |
| 11667 | xt_prop_sec); |
| 11668 | |
| 11669 | if (warn_unaligned_branch_targets) |
| 11670 | bfd_map_over_sections (stdoutput, xtensa_find_unaligned_branch_targets, 0); |
| 11671 | bfd_map_over_sections (stdoutput, xtensa_find_unaligned_loops, 0); |
| 11672 | } |
| 11673 | |
| 11674 | |
| 11675 | /* This function is only meaningful after xtensa_move_literals. */ |
| 11676 | |
| 11677 | static bfd_boolean |
| 11678 | get_frag_is_literal (const fragS *fragP) |
| 11679 | { |
| 11680 | gas_assert (fragP != NULL); |
| 11681 | return fragP->tc_frag_data.is_literal; |
| 11682 | } |
| 11683 | |
| 11684 | |
| 11685 | static void |
| 11686 | xtensa_create_property_segments (frag_predicate property_function, |
| 11687 | frag_predicate end_property_function, |
| 11688 | const char *section_name_base, |
| 11689 | xt_section_type sec_type) |
| 11690 | { |
| 11691 | segT *seclist; |
| 11692 | |
| 11693 | /* Walk over all of the current segments. |
| 11694 | Walk over each fragment |
| 11695 | For each non-empty fragment, |
| 11696 | Build a property record (append where possible). */ |
| 11697 | |
| 11698 | for (seclist = &stdoutput->sections; |
| 11699 | seclist && *seclist; |
| 11700 | seclist = &(*seclist)->next) |
| 11701 | { |
| 11702 | segT sec = *seclist; |
| 11703 | |
| 11704 | if (exclude_section_from_property_tables (sec)) |
| 11705 | continue; |
| 11706 | |
| 11707 | if (section_has_property (sec, property_function)) |
| 11708 | { |
| 11709 | segment_info_type *xt_seg_info; |
| 11710 | xtensa_block_info **xt_blocks; |
| 11711 | segT prop_sec = xtensa_make_property_section (sec, section_name_base); |
| 11712 | |
| 11713 | prop_sec->output_section = prop_sec; |
| 11714 | subseg_set (prop_sec, 0); |
| 11715 | xt_seg_info = seg_info (prop_sec); |
| 11716 | xt_blocks = &xt_seg_info->tc_segment_info_data.blocks[sec_type]; |
| 11717 | |
| 11718 | /* Walk over all of the frchains here and add new sections. */ |
| 11719 | add_xt_block_frags (sec, xt_blocks, property_function, |
| 11720 | end_property_function); |
| 11721 | } |
| 11722 | } |
| 11723 | |
| 11724 | /* Now we fill them out.... */ |
| 11725 | |
| 11726 | for (seclist = &stdoutput->sections; |
| 11727 | seclist && *seclist; |
| 11728 | seclist = &(*seclist)->next) |
| 11729 | { |
| 11730 | segment_info_type *seginfo; |
| 11731 | xtensa_block_info *block; |
| 11732 | segT sec = *seclist; |
| 11733 | |
| 11734 | seginfo = seg_info (sec); |
| 11735 | block = seginfo->tc_segment_info_data.blocks[sec_type]; |
| 11736 | |
| 11737 | if (block) |
| 11738 | { |
| 11739 | xtensa_block_info *cur_block; |
| 11740 | int num_recs = 0; |
| 11741 | bfd_size_type rec_size; |
| 11742 | |
| 11743 | for (cur_block = block; cur_block; cur_block = cur_block->next) |
| 11744 | num_recs++; |
| 11745 | |
| 11746 | rec_size = num_recs * 8; |
| 11747 | bfd_set_section_size (stdoutput, sec, rec_size); |
| 11748 | |
| 11749 | if (num_recs) |
| 11750 | { |
| 11751 | char *frag_data; |
| 11752 | int i; |
| 11753 | |
| 11754 | subseg_set (sec, 0); |
| 11755 | frag_data = frag_more (rec_size); |
| 11756 | cur_block = block; |
| 11757 | for (i = 0; i < num_recs; i++) |
| 11758 | { |
| 11759 | fixS *fix; |
| 11760 | |
| 11761 | /* Write the fixup. */ |
| 11762 | gas_assert (cur_block); |
| 11763 | fix = fix_new (frag_now, i * 8, 4, |
| 11764 | section_symbol (cur_block->sec), |
| 11765 | cur_block->offset, |
| 11766 | FALSE, BFD_RELOC_32); |
| 11767 | fix->fx_file = "<internal>"; |
| 11768 | fix->fx_line = 0; |
| 11769 | |
| 11770 | /* Write the length. */ |
| 11771 | md_number_to_chars (&frag_data[4 + i * 8], |
| 11772 | cur_block->size, 4); |
| 11773 | cur_block = cur_block->next; |
| 11774 | } |
| 11775 | frag_wane (frag_now); |
| 11776 | frag_new (0); |
| 11777 | frag_wane (frag_now); |
| 11778 | } |
| 11779 | } |
| 11780 | } |
| 11781 | } |
| 11782 | |
| 11783 | |
| 11784 | static void |
| 11785 | xtensa_create_xproperty_segments (frag_flags_fn flag_fn, |
| 11786 | const char *section_name_base, |
| 11787 | xt_section_type sec_type) |
| 11788 | { |
| 11789 | segT *seclist; |
| 11790 | |
| 11791 | /* Walk over all of the current segments. |
| 11792 | Walk over each fragment. |
| 11793 | For each fragment that has instructions, |
| 11794 | build an instruction record (append where possible). */ |
| 11795 | |
| 11796 | for (seclist = &stdoutput->sections; |
| 11797 | seclist && *seclist; |
| 11798 | seclist = &(*seclist)->next) |
| 11799 | { |
| 11800 | segT sec = *seclist; |
| 11801 | |
| 11802 | if (exclude_section_from_property_tables (sec)) |
| 11803 | continue; |
| 11804 | |
| 11805 | if (section_has_xproperty (sec, flag_fn)) |
| 11806 | { |
| 11807 | segment_info_type *xt_seg_info; |
| 11808 | xtensa_block_info **xt_blocks; |
| 11809 | segT prop_sec = xtensa_make_property_section (sec, section_name_base); |
| 11810 | |
| 11811 | prop_sec->output_section = prop_sec; |
| 11812 | subseg_set (prop_sec, 0); |
| 11813 | xt_seg_info = seg_info (prop_sec); |
| 11814 | xt_blocks = &xt_seg_info->tc_segment_info_data.blocks[sec_type]; |
| 11815 | |
| 11816 | /* Walk over all of the frchains here and add new sections. */ |
| 11817 | add_xt_prop_frags (sec, xt_blocks, flag_fn); |
| 11818 | } |
| 11819 | } |
| 11820 | |
| 11821 | /* Now we fill them out.... */ |
| 11822 | |
| 11823 | for (seclist = &stdoutput->sections; |
| 11824 | seclist && *seclist; |
| 11825 | seclist = &(*seclist)->next) |
| 11826 | { |
| 11827 | segment_info_type *seginfo; |
| 11828 | xtensa_block_info *block; |
| 11829 | segT sec = *seclist; |
| 11830 | |
| 11831 | seginfo = seg_info (sec); |
| 11832 | block = seginfo->tc_segment_info_data.blocks[sec_type]; |
| 11833 | |
| 11834 | if (block) |
| 11835 | { |
| 11836 | xtensa_block_info *cur_block; |
| 11837 | int num_recs = 0; |
| 11838 | bfd_size_type rec_size; |
| 11839 | |
| 11840 | for (cur_block = block; cur_block; cur_block = cur_block->next) |
| 11841 | num_recs++; |
| 11842 | |
| 11843 | rec_size = num_recs * (8 + 4); |
| 11844 | bfd_set_section_size (stdoutput, sec, rec_size); |
| 11845 | /* elf_section_data (sec)->this_hdr.sh_entsize = 12; */ |
| 11846 | |
| 11847 | if (num_recs) |
| 11848 | { |
| 11849 | char *frag_data; |
| 11850 | int i; |
| 11851 | |
| 11852 | subseg_set (sec, 0); |
| 11853 | frag_data = frag_more (rec_size); |
| 11854 | cur_block = block; |
| 11855 | for (i = 0; i < num_recs; i++) |
| 11856 | { |
| 11857 | fixS *fix; |
| 11858 | |
| 11859 | /* Write the fixup. */ |
| 11860 | gas_assert (cur_block); |
| 11861 | fix = fix_new (frag_now, i * 12, 4, |
| 11862 | section_symbol (cur_block->sec), |
| 11863 | cur_block->offset, |
| 11864 | FALSE, BFD_RELOC_32); |
| 11865 | fix->fx_file = "<internal>"; |
| 11866 | fix->fx_line = 0; |
| 11867 | |
| 11868 | /* Write the length. */ |
| 11869 | md_number_to_chars (&frag_data[4 + i * 12], |
| 11870 | cur_block->size, 4); |
| 11871 | md_number_to_chars (&frag_data[8 + i * 12], |
| 11872 | frag_flags_to_number (&cur_block->flags), |
| 11873 | sizeof (flagword)); |
| 11874 | cur_block = cur_block->next; |
| 11875 | } |
| 11876 | frag_wane (frag_now); |
| 11877 | frag_new (0); |
| 11878 | frag_wane (frag_now); |
| 11879 | } |
| 11880 | } |
| 11881 | } |
| 11882 | } |
| 11883 | |
| 11884 | |
| 11885 | static bfd_boolean |
| 11886 | exclude_section_from_property_tables (segT sec) |
| 11887 | { |
| 11888 | flagword flags = bfd_get_section_flags (stdoutput, sec); |
| 11889 | |
| 11890 | /* Sections that don't contribute to the memory footprint are excluded. */ |
| 11891 | if ((flags & SEC_DEBUGGING) |
| 11892 | || !(flags & SEC_ALLOC) |
| 11893 | || (flags & SEC_MERGE)) |
| 11894 | return TRUE; |
| 11895 | |
| 11896 | /* Linker cie and fde optimizations mess up property entries for |
| 11897 | eh_frame sections, but there is nothing inside them relevant to |
| 11898 | property tables anyway. */ |
| 11899 | if (strcmp (sec->name, ".eh_frame") == 0) |
| 11900 | return TRUE; |
| 11901 | |
| 11902 | return FALSE; |
| 11903 | } |
| 11904 | |
| 11905 | |
| 11906 | static bfd_boolean |
| 11907 | section_has_property (segT sec, frag_predicate property_function) |
| 11908 | { |
| 11909 | segment_info_type *seginfo = seg_info (sec); |
| 11910 | fragS *fragP; |
| 11911 | |
| 11912 | if (seginfo && seginfo->frchainP) |
| 11913 | { |
| 11914 | for (fragP = seginfo->frchainP->frch_root; fragP; fragP = fragP->fr_next) |
| 11915 | { |
| 11916 | if (property_function (fragP) |
| 11917 | && (fragP->fr_type != rs_fill || fragP->fr_fix != 0)) |
| 11918 | return TRUE; |
| 11919 | } |
| 11920 | } |
| 11921 | return FALSE; |
| 11922 | } |
| 11923 | |
| 11924 | |
| 11925 | static bfd_boolean |
| 11926 | section_has_xproperty (segT sec, frag_flags_fn property_function) |
| 11927 | { |
| 11928 | segment_info_type *seginfo = seg_info (sec); |
| 11929 | fragS *fragP; |
| 11930 | |
| 11931 | if (seginfo && seginfo->frchainP) |
| 11932 | { |
| 11933 | for (fragP = seginfo->frchainP->frch_root; fragP; fragP = fragP->fr_next) |
| 11934 | { |
| 11935 | frag_flags prop_flags; |
| 11936 | property_function (fragP, &prop_flags); |
| 11937 | if (!xtensa_frag_flags_is_empty (&prop_flags)) |
| 11938 | return TRUE; |
| 11939 | } |
| 11940 | } |
| 11941 | return FALSE; |
| 11942 | } |
| 11943 | |
| 11944 | |
| 11945 | /* Two types of block sections exist right now: literal and insns. */ |
| 11946 | |
| 11947 | static void |
| 11948 | add_xt_block_frags (segT sec, |
| 11949 | xtensa_block_info **xt_block, |
| 11950 | frag_predicate property_function, |
| 11951 | frag_predicate end_property_function) |
| 11952 | { |
| 11953 | fragS *fragP; |
| 11954 | |
| 11955 | /* Build it if needed. */ |
| 11956 | while (*xt_block != NULL) |
| 11957 | xt_block = &(*xt_block)->next; |
| 11958 | /* We are either at NULL at the beginning or at the end. */ |
| 11959 | |
| 11960 | /* Walk through the frags. */ |
| 11961 | if (seg_info (sec)->frchainP) |
| 11962 | { |
| 11963 | for (fragP = seg_info (sec)->frchainP->frch_root; |
| 11964 | fragP; |
| 11965 | fragP = fragP->fr_next) |
| 11966 | { |
| 11967 | if (property_function (fragP) |
| 11968 | && (fragP->fr_type != rs_fill || fragP->fr_fix != 0)) |
| 11969 | { |
| 11970 | if (*xt_block != NULL) |
| 11971 | { |
| 11972 | if ((*xt_block)->offset + (*xt_block)->size |
| 11973 | == fragP->fr_address) |
| 11974 | (*xt_block)->size += fragP->fr_fix; |
| 11975 | else |
| 11976 | xt_block = &((*xt_block)->next); |
| 11977 | } |
| 11978 | if (*xt_block == NULL) |
| 11979 | { |
| 11980 | xtensa_block_info *new_block = (xtensa_block_info *) |
| 11981 | xmalloc (sizeof (xtensa_block_info)); |
| 11982 | new_block->sec = sec; |
| 11983 | new_block->offset = fragP->fr_address; |
| 11984 | new_block->size = fragP->fr_fix; |
| 11985 | new_block->next = NULL; |
| 11986 | xtensa_frag_flags_init (&new_block->flags); |
| 11987 | *xt_block = new_block; |
| 11988 | } |
| 11989 | if (end_property_function |
| 11990 | && end_property_function (fragP)) |
| 11991 | { |
| 11992 | xt_block = &((*xt_block)->next); |
| 11993 | } |
| 11994 | } |
| 11995 | } |
| 11996 | } |
| 11997 | } |
| 11998 | |
| 11999 | |
| 12000 | /* Break the encapsulation of add_xt_prop_frags here. */ |
| 12001 | |
| 12002 | static bfd_boolean |
| 12003 | xtensa_frag_flags_is_empty (const frag_flags *prop_flags) |
| 12004 | { |
| 12005 | if (prop_flags->is_literal |
| 12006 | || prop_flags->is_insn |
| 12007 | || prop_flags->is_data |
| 12008 | || prop_flags->is_unreachable) |
| 12009 | return FALSE; |
| 12010 | return TRUE; |
| 12011 | } |
| 12012 | |
| 12013 | |
| 12014 | static void |
| 12015 | xtensa_frag_flags_init (frag_flags *prop_flags) |
| 12016 | { |
| 12017 | memset (prop_flags, 0, sizeof (frag_flags)); |
| 12018 | } |
| 12019 | |
| 12020 | |
| 12021 | static void |
| 12022 | get_frag_property_flags (const fragS *fragP, frag_flags *prop_flags) |
| 12023 | { |
| 12024 | xtensa_frag_flags_init (prop_flags); |
| 12025 | if (fragP->tc_frag_data.is_literal) |
| 12026 | prop_flags->is_literal = TRUE; |
| 12027 | if (fragP->tc_frag_data.is_specific_opcode |
| 12028 | || fragP->tc_frag_data.is_no_transform) |
| 12029 | { |
| 12030 | prop_flags->is_no_transform = TRUE; |
| 12031 | if (xtensa_frag_flags_is_empty (prop_flags)) |
| 12032 | prop_flags->is_data = TRUE; |
| 12033 | } |
| 12034 | if (fragP->tc_frag_data.is_unreachable) |
| 12035 | prop_flags->is_unreachable = TRUE; |
| 12036 | else if (fragP->tc_frag_data.is_insn) |
| 12037 | { |
| 12038 | prop_flags->is_insn = TRUE; |
| 12039 | if (fragP->tc_frag_data.is_loop_target) |
| 12040 | prop_flags->insn.is_loop_target = TRUE; |
| 12041 | if (fragP->tc_frag_data.is_branch_target) |
| 12042 | prop_flags->insn.is_branch_target = TRUE; |
| 12043 | if (fragP->tc_frag_data.is_no_density) |
| 12044 | prop_flags->insn.is_no_density = TRUE; |
| 12045 | if (fragP->tc_frag_data.use_absolute_literals) |
| 12046 | prop_flags->insn.is_abslit = TRUE; |
| 12047 | } |
| 12048 | if (fragP->tc_frag_data.is_align) |
| 12049 | { |
| 12050 | prop_flags->is_align = TRUE; |
| 12051 | prop_flags->alignment = fragP->tc_frag_data.alignment; |
| 12052 | if (xtensa_frag_flags_is_empty (prop_flags)) |
| 12053 | prop_flags->is_data = TRUE; |
| 12054 | } |
| 12055 | } |
| 12056 | |
| 12057 | |
| 12058 | static flagword |
| 12059 | frag_flags_to_number (const frag_flags *prop_flags) |
| 12060 | { |
| 12061 | flagword num = 0; |
| 12062 | if (prop_flags->is_literal) |
| 12063 | num |= XTENSA_PROP_LITERAL; |
| 12064 | if (prop_flags->is_insn) |
| 12065 | num |= XTENSA_PROP_INSN; |
| 12066 | if (prop_flags->is_data) |
| 12067 | num |= XTENSA_PROP_DATA; |
| 12068 | if (prop_flags->is_unreachable) |
| 12069 | num |= XTENSA_PROP_UNREACHABLE; |
| 12070 | if (prop_flags->insn.is_loop_target) |
| 12071 | num |= XTENSA_PROP_INSN_LOOP_TARGET; |
| 12072 | if (prop_flags->insn.is_branch_target) |
| 12073 | { |
| 12074 | num |= XTENSA_PROP_INSN_BRANCH_TARGET; |
| 12075 | num = SET_XTENSA_PROP_BT_ALIGN (num, prop_flags->insn.bt_align_priority); |
| 12076 | } |
| 12077 | |
| 12078 | if (prop_flags->insn.is_no_density) |
| 12079 | num |= XTENSA_PROP_INSN_NO_DENSITY; |
| 12080 | if (prop_flags->is_no_transform) |
| 12081 | num |= XTENSA_PROP_NO_TRANSFORM; |
| 12082 | if (prop_flags->insn.is_no_reorder) |
| 12083 | num |= XTENSA_PROP_INSN_NO_REORDER; |
| 12084 | if (prop_flags->insn.is_abslit) |
| 12085 | num |= XTENSA_PROP_INSN_ABSLIT; |
| 12086 | |
| 12087 | if (prop_flags->is_align) |
| 12088 | { |
| 12089 | num |= XTENSA_PROP_ALIGN; |
| 12090 | num = SET_XTENSA_PROP_ALIGNMENT (num, prop_flags->alignment); |
| 12091 | } |
| 12092 | |
| 12093 | return num; |
| 12094 | } |
| 12095 | |
| 12096 | |
| 12097 | static bfd_boolean |
| 12098 | xtensa_frag_flags_combinable (const frag_flags *prop_flags_1, |
| 12099 | const frag_flags *prop_flags_2) |
| 12100 | { |
| 12101 | /* Cannot combine with an end marker. */ |
| 12102 | |
| 12103 | if (prop_flags_1->is_literal != prop_flags_2->is_literal) |
| 12104 | return FALSE; |
| 12105 | if (prop_flags_1->is_insn != prop_flags_2->is_insn) |
| 12106 | return FALSE; |
| 12107 | if (prop_flags_1->is_data != prop_flags_2->is_data) |
| 12108 | return FALSE; |
| 12109 | |
| 12110 | if (prop_flags_1->is_insn) |
| 12111 | { |
| 12112 | /* Properties of the beginning of the frag. */ |
| 12113 | if (prop_flags_2->insn.is_loop_target) |
| 12114 | return FALSE; |
| 12115 | if (prop_flags_2->insn.is_branch_target) |
| 12116 | return FALSE; |
| 12117 | if (prop_flags_1->insn.is_no_density != |
| 12118 | prop_flags_2->insn.is_no_density) |
| 12119 | return FALSE; |
| 12120 | if (prop_flags_1->is_no_transform != |
| 12121 | prop_flags_2->is_no_transform) |
| 12122 | return FALSE; |
| 12123 | if (prop_flags_1->insn.is_no_reorder != |
| 12124 | prop_flags_2->insn.is_no_reorder) |
| 12125 | return FALSE; |
| 12126 | if (prop_flags_1->insn.is_abslit != |
| 12127 | prop_flags_2->insn.is_abslit) |
| 12128 | return FALSE; |
| 12129 | } |
| 12130 | |
| 12131 | if (prop_flags_1->is_align) |
| 12132 | return FALSE; |
| 12133 | |
| 12134 | return TRUE; |
| 12135 | } |
| 12136 | |
| 12137 | |
| 12138 | static bfd_vma |
| 12139 | xt_block_aligned_size (const xtensa_block_info *xt_block) |
| 12140 | { |
| 12141 | bfd_vma end_addr; |
| 12142 | unsigned align_bits; |
| 12143 | |
| 12144 | if (!xt_block->flags.is_align) |
| 12145 | return xt_block->size; |
| 12146 | |
| 12147 | end_addr = xt_block->offset + xt_block->size; |
| 12148 | align_bits = xt_block->flags.alignment; |
| 12149 | end_addr = ((end_addr + ((1 << align_bits) -1)) >> align_bits) << align_bits; |
| 12150 | return end_addr - xt_block->offset; |
| 12151 | } |
| 12152 | |
| 12153 | |
| 12154 | static bfd_boolean |
| 12155 | xtensa_xt_block_combine (xtensa_block_info *xt_block, |
| 12156 | const xtensa_block_info *xt_block_2) |
| 12157 | { |
| 12158 | if (xt_block->sec != xt_block_2->sec) |
| 12159 | return FALSE; |
| 12160 | if (xt_block->offset + xt_block_aligned_size (xt_block) |
| 12161 | != xt_block_2->offset) |
| 12162 | return FALSE; |
| 12163 | |
| 12164 | if (xt_block_2->size == 0 |
| 12165 | && (!xt_block_2->flags.is_unreachable |
| 12166 | || xt_block->flags.is_unreachable)) |
| 12167 | { |
| 12168 | if (xt_block_2->flags.is_align |
| 12169 | && xt_block->flags.is_align) |
| 12170 | { |
| 12171 | /* Nothing needed. */ |
| 12172 | if (xt_block->flags.alignment >= xt_block_2->flags.alignment) |
| 12173 | return TRUE; |
| 12174 | } |
| 12175 | else |
| 12176 | { |
| 12177 | if (xt_block_2->flags.is_align) |
| 12178 | { |
| 12179 | /* Push alignment to previous entry. */ |
| 12180 | xt_block->flags.is_align = xt_block_2->flags.is_align; |
| 12181 | xt_block->flags.alignment = xt_block_2->flags.alignment; |
| 12182 | } |
| 12183 | return TRUE; |
| 12184 | } |
| 12185 | } |
| 12186 | if (!xtensa_frag_flags_combinable (&xt_block->flags, |
| 12187 | &xt_block_2->flags)) |
| 12188 | return FALSE; |
| 12189 | |
| 12190 | xt_block->size += xt_block_2->size; |
| 12191 | |
| 12192 | if (xt_block_2->flags.is_align) |
| 12193 | { |
| 12194 | xt_block->flags.is_align = TRUE; |
| 12195 | xt_block->flags.alignment = xt_block_2->flags.alignment; |
| 12196 | } |
| 12197 | |
| 12198 | return TRUE; |
| 12199 | } |
| 12200 | |
| 12201 | |
| 12202 | static void |
| 12203 | add_xt_prop_frags (segT sec, |
| 12204 | xtensa_block_info **xt_block, |
| 12205 | frag_flags_fn property_function) |
| 12206 | { |
| 12207 | fragS *fragP; |
| 12208 | |
| 12209 | /* Build it if needed. */ |
| 12210 | while (*xt_block != NULL) |
| 12211 | { |
| 12212 | xt_block = &(*xt_block)->next; |
| 12213 | } |
| 12214 | /* We are either at NULL at the beginning or at the end. */ |
| 12215 | |
| 12216 | /* Walk through the frags. */ |
| 12217 | if (seg_info (sec)->frchainP) |
| 12218 | { |
| 12219 | for (fragP = seg_info (sec)->frchainP->frch_root; fragP; |
| 12220 | fragP = fragP->fr_next) |
| 12221 | { |
| 12222 | xtensa_block_info tmp_block; |
| 12223 | tmp_block.sec = sec; |
| 12224 | tmp_block.offset = fragP->fr_address; |
| 12225 | tmp_block.size = fragP->fr_fix; |
| 12226 | tmp_block.next = NULL; |
| 12227 | property_function (fragP, &tmp_block.flags); |
| 12228 | |
| 12229 | if (!xtensa_frag_flags_is_empty (&tmp_block.flags)) |
| 12230 | /* && fragP->fr_fix != 0) */ |
| 12231 | { |
| 12232 | if ((*xt_block) == NULL |
| 12233 | || !xtensa_xt_block_combine (*xt_block, &tmp_block)) |
| 12234 | { |
| 12235 | xtensa_block_info *new_block; |
| 12236 | if ((*xt_block) != NULL) |
| 12237 | xt_block = &(*xt_block)->next; |
| 12238 | new_block = (xtensa_block_info *) |
| 12239 | xmalloc (sizeof (xtensa_block_info)); |
| 12240 | *new_block = tmp_block; |
| 12241 | *xt_block = new_block; |
| 12242 | } |
| 12243 | } |
| 12244 | } |
| 12245 | } |
| 12246 | } |
| 12247 | |
| 12248 | \f |
| 12249 | /* op_placement_info_table */ |
| 12250 | |
| 12251 | /* op_placement_info makes it easier to determine which |
| 12252 | ops can go in which slots. */ |
| 12253 | |
| 12254 | static void |
| 12255 | init_op_placement_info_table (void) |
| 12256 | { |
| 12257 | xtensa_isa isa = xtensa_default_isa; |
| 12258 | xtensa_insnbuf ibuf = xtensa_insnbuf_alloc (isa); |
| 12259 | xtensa_opcode opcode; |
| 12260 | xtensa_format fmt; |
| 12261 | int slot; |
| 12262 | int num_opcodes = xtensa_isa_num_opcodes (isa); |
| 12263 | |
| 12264 | op_placement_table = (op_placement_info_table) |
| 12265 | xmalloc (sizeof (op_placement_info) * num_opcodes); |
| 12266 | gas_assert (xtensa_isa_num_formats (isa) < MAX_FORMATS); |
| 12267 | |
| 12268 | for (opcode = 0; opcode < num_opcodes; opcode++) |
| 12269 | { |
| 12270 | op_placement_info *opi = &op_placement_table[opcode]; |
| 12271 | /* FIXME: Make tinsn allocation dynamic. */ |
| 12272 | if (xtensa_opcode_num_operands (isa, opcode) > MAX_INSN_ARGS) |
| 12273 | as_fatal (_("too many operands in instruction")); |
| 12274 | opi->narrowest = XTENSA_UNDEFINED; |
| 12275 | opi->narrowest_size = 0x7F; |
| 12276 | opi->narrowest_slot = 0; |
| 12277 | opi->formats = 0; |
| 12278 | opi->num_formats = 0; |
| 12279 | opi->issuef = 0; |
| 12280 | for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++) |
| 12281 | { |
| 12282 | opi->slots[fmt] = 0; |
| 12283 | for (slot = 0; slot < xtensa_format_num_slots (isa, fmt); slot++) |
| 12284 | { |
| 12285 | if (xtensa_opcode_encode (isa, fmt, slot, ibuf, opcode) == 0) |
| 12286 | { |
| 12287 | int fmt_length = xtensa_format_length (isa, fmt); |
| 12288 | opi->issuef++; |
| 12289 | set_bit (fmt, opi->formats); |
| 12290 | set_bit (slot, opi->slots[fmt]); |
| 12291 | if (fmt_length < opi->narrowest_size |
| 12292 | || (fmt_length == opi->narrowest_size |
| 12293 | && (xtensa_format_num_slots (isa, fmt) |
| 12294 | < xtensa_format_num_slots (isa, |
| 12295 | opi->narrowest)))) |
| 12296 | { |
| 12297 | opi->narrowest = fmt; |
| 12298 | opi->narrowest_size = fmt_length; |
| 12299 | opi->narrowest_slot = slot; |
| 12300 | } |
| 12301 | } |
| 12302 | } |
| 12303 | if (opi->formats) |
| 12304 | opi->num_formats++; |
| 12305 | } |
| 12306 | } |
| 12307 | xtensa_insnbuf_free (isa, ibuf); |
| 12308 | } |
| 12309 | |
| 12310 | |
| 12311 | bfd_boolean |
| 12312 | opcode_fits_format_slot (xtensa_opcode opcode, xtensa_format fmt, int slot) |
| 12313 | { |
| 12314 | return bit_is_set (slot, op_placement_table[opcode].slots[fmt]); |
| 12315 | } |
| 12316 | |
| 12317 | |
| 12318 | /* If the opcode is available in a single slot format, return its size. */ |
| 12319 | |
| 12320 | static int |
| 12321 | xg_get_single_size (xtensa_opcode opcode) |
| 12322 | { |
| 12323 | return op_placement_table[opcode].narrowest_size; |
| 12324 | } |
| 12325 | |
| 12326 | |
| 12327 | static xtensa_format |
| 12328 | xg_get_single_format (xtensa_opcode opcode) |
| 12329 | { |
| 12330 | return op_placement_table[opcode].narrowest; |
| 12331 | } |
| 12332 | |
| 12333 | |
| 12334 | static int |
| 12335 | xg_get_single_slot (xtensa_opcode opcode) |
| 12336 | { |
| 12337 | return op_placement_table[opcode].narrowest_slot; |
| 12338 | } |
| 12339 | |
| 12340 | \f |
| 12341 | /* Instruction Stack Functions (from "xtensa-istack.h"). */ |
| 12342 | |
| 12343 | void |
| 12344 | istack_init (IStack *stack) |
| 12345 | { |
| 12346 | stack->ninsn = 0; |
| 12347 | } |
| 12348 | |
| 12349 | |
| 12350 | bfd_boolean |
| 12351 | istack_empty (IStack *stack) |
| 12352 | { |
| 12353 | return (stack->ninsn == 0); |
| 12354 | } |
| 12355 | |
| 12356 | |
| 12357 | bfd_boolean |
| 12358 | istack_full (IStack *stack) |
| 12359 | { |
| 12360 | return (stack->ninsn == MAX_ISTACK); |
| 12361 | } |
| 12362 | |
| 12363 | |
| 12364 | /* Return a pointer to the top IStack entry. |
| 12365 | It is an error to call this if istack_empty () is TRUE. */ |
| 12366 | |
| 12367 | TInsn * |
| 12368 | istack_top (IStack *stack) |
| 12369 | { |
| 12370 | int rec = stack->ninsn - 1; |
| 12371 | gas_assert (!istack_empty (stack)); |
| 12372 | return &stack->insn[rec]; |
| 12373 | } |
| 12374 | |
| 12375 | |
| 12376 | /* Add a new TInsn to an IStack. |
| 12377 | It is an error to call this if istack_full () is TRUE. */ |
| 12378 | |
| 12379 | void |
| 12380 | istack_push (IStack *stack, TInsn *insn) |
| 12381 | { |
| 12382 | int rec = stack->ninsn; |
| 12383 | gas_assert (!istack_full (stack)); |
| 12384 | stack->insn[rec] = *insn; |
| 12385 | stack->ninsn++; |
| 12386 | } |
| 12387 | |
| 12388 | |
| 12389 | /* Clear space for the next TInsn on the IStack and return a pointer |
| 12390 | to it. It is an error to call this if istack_full () is TRUE. */ |
| 12391 | |
| 12392 | TInsn * |
| 12393 | istack_push_space (IStack *stack) |
| 12394 | { |
| 12395 | int rec = stack->ninsn; |
| 12396 | TInsn *insn; |
| 12397 | gas_assert (!istack_full (stack)); |
| 12398 | insn = &stack->insn[rec]; |
| 12399 | tinsn_init (insn); |
| 12400 | stack->ninsn++; |
| 12401 | return insn; |
| 12402 | } |
| 12403 | |
| 12404 | |
| 12405 | /* Remove the last pushed instruction. It is an error to call this if |
| 12406 | istack_empty () returns TRUE. */ |
| 12407 | |
| 12408 | void |
| 12409 | istack_pop (IStack *stack) |
| 12410 | { |
| 12411 | int rec = stack->ninsn - 1; |
| 12412 | gas_assert (!istack_empty (stack)); |
| 12413 | stack->ninsn--; |
| 12414 | tinsn_init (&stack->insn[rec]); |
| 12415 | } |
| 12416 | |
| 12417 | \f |
| 12418 | /* TInsn functions. */ |
| 12419 | |
| 12420 | void |
| 12421 | tinsn_init (TInsn *dst) |
| 12422 | { |
| 12423 | memset (dst, 0, sizeof (TInsn)); |
| 12424 | } |
| 12425 | |
| 12426 | |
| 12427 | /* Return TRUE if ANY of the operands in the insn are symbolic. */ |
| 12428 | |
| 12429 | static bfd_boolean |
| 12430 | tinsn_has_symbolic_operands (const TInsn *insn) |
| 12431 | { |
| 12432 | int i; |
| 12433 | int n = insn->ntok; |
| 12434 | |
| 12435 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 12436 | |
| 12437 | for (i = 0; i < n; ++i) |
| 12438 | { |
| 12439 | switch (insn->tok[i].X_op) |
| 12440 | { |
| 12441 | case O_register: |
| 12442 | case O_constant: |
| 12443 | break; |
| 12444 | default: |
| 12445 | return TRUE; |
| 12446 | } |
| 12447 | } |
| 12448 | return FALSE; |
| 12449 | } |
| 12450 | |
| 12451 | |
| 12452 | bfd_boolean |
| 12453 | tinsn_has_invalid_symbolic_operands (const TInsn *insn) |
| 12454 | { |
| 12455 | xtensa_isa isa = xtensa_default_isa; |
| 12456 | int i; |
| 12457 | int n = insn->ntok; |
| 12458 | |
| 12459 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 12460 | |
| 12461 | for (i = 0; i < n; ++i) |
| 12462 | { |
| 12463 | switch (insn->tok[i].X_op) |
| 12464 | { |
| 12465 | case O_register: |
| 12466 | case O_constant: |
| 12467 | break; |
| 12468 | case O_big: |
| 12469 | case O_illegal: |
| 12470 | case O_absent: |
| 12471 | /* Errors for these types are caught later. */ |
| 12472 | break; |
| 12473 | case O_hi16: |
| 12474 | case O_lo16: |
| 12475 | default: |
| 12476 | /* Symbolic immediates are only allowed on the last immediate |
| 12477 | operand. At this time, CONST16 is the only opcode where we |
| 12478 | support non-PC-relative relocations. */ |
| 12479 | if (i != get_relaxable_immed (insn->opcode) |
| 12480 | || (xtensa_operand_is_PCrelative (isa, insn->opcode, i) != 1 |
| 12481 | && insn->opcode != xtensa_const16_opcode)) |
| 12482 | { |
| 12483 | as_bad (_("invalid symbolic operand")); |
| 12484 | return TRUE; |
| 12485 | } |
| 12486 | } |
| 12487 | } |
| 12488 | return FALSE; |
| 12489 | } |
| 12490 | |
| 12491 | |
| 12492 | /* For assembly code with complex expressions (e.g. subtraction), |
| 12493 | we have to build them in the literal pool so that |
| 12494 | their results are calculated correctly after relaxation. |
| 12495 | The relaxation only handles expressions that |
| 12496 | boil down to SYMBOL + OFFSET. */ |
| 12497 | |
| 12498 | static bfd_boolean |
| 12499 | tinsn_has_complex_operands (const TInsn *insn) |
| 12500 | { |
| 12501 | int i; |
| 12502 | int n = insn->ntok; |
| 12503 | gas_assert (insn->insn_type == ITYPE_INSN); |
| 12504 | for (i = 0; i < n; ++i) |
| 12505 | { |
| 12506 | switch (insn->tok[i].X_op) |
| 12507 | { |
| 12508 | case O_register: |
| 12509 | case O_constant: |
| 12510 | case O_symbol: |
| 12511 | case O_lo16: |
| 12512 | case O_hi16: |
| 12513 | break; |
| 12514 | default: |
| 12515 | return TRUE; |
| 12516 | } |
| 12517 | } |
| 12518 | return FALSE; |
| 12519 | } |
| 12520 | |
| 12521 | |
| 12522 | /* Encode a TInsn opcode and its constant operands into slotbuf. |
| 12523 | Return TRUE if there is a symbol in the immediate field. This |
| 12524 | function assumes that: |
| 12525 | 1) The number of operands are correct. |
| 12526 | 2) The insn_type is ITYPE_INSN. |
| 12527 | 3) The opcode can be encoded in the specified format and slot. |
| 12528 | 4) Operands are either O_constant or O_symbol, and all constants fit. */ |
| 12529 | |
| 12530 | static bfd_boolean |
| 12531 | tinsn_to_slotbuf (xtensa_format fmt, |
| 12532 | int slot, |
| 12533 | TInsn *tinsn, |
| 12534 | xtensa_insnbuf slotbuf) |
| 12535 | { |
| 12536 | xtensa_isa isa = xtensa_default_isa; |
| 12537 | xtensa_opcode opcode = tinsn->opcode; |
| 12538 | bfd_boolean has_fixup = FALSE; |
| 12539 | int noperands = xtensa_opcode_num_operands (isa, opcode); |
| 12540 | int i; |
| 12541 | |
| 12542 | gas_assert (tinsn->insn_type == ITYPE_INSN); |
| 12543 | if (noperands != tinsn->ntok) |
| 12544 | as_fatal (_("operand number mismatch")); |
| 12545 | |
| 12546 | if (xtensa_opcode_encode (isa, fmt, slot, slotbuf, opcode)) |
| 12547 | { |
| 12548 | as_bad (_("cannot encode opcode \"%s\" in the given format \"%s\""), |
| 12549 | xtensa_opcode_name (isa, opcode), xtensa_format_name (isa, fmt)); |
| 12550 | return FALSE; |
| 12551 | } |
| 12552 | |
| 12553 | for (i = 0; i < noperands; i++) |
| 12554 | { |
| 12555 | expressionS *exp = &tinsn->tok[i]; |
| 12556 | int rc; |
| 12557 | unsigned line; |
| 12558 | const char *file_name; |
| 12559 | uint32 opnd_value; |
| 12560 | |
| 12561 | switch (exp->X_op) |
| 12562 | { |
| 12563 | case O_register: |
| 12564 | if (xtensa_operand_is_visible (isa, opcode, i) == 0) |
| 12565 | break; |
| 12566 | /* The register number has already been checked in |
| 12567 | expression_maybe_register, so we don't need to check here. */ |
| 12568 | opnd_value = exp->X_add_number; |
| 12569 | (void) xtensa_operand_encode (isa, opcode, i, &opnd_value); |
| 12570 | rc = xtensa_operand_set_field (isa, opcode, i, fmt, slot, slotbuf, |
| 12571 | opnd_value); |
| 12572 | if (rc != 0) |
| 12573 | as_warn (_("xtensa-isa failure: %s"), xtensa_isa_error_msg (isa)); |
| 12574 | break; |
| 12575 | |
| 12576 | case O_constant: |
| 12577 | if (xtensa_operand_is_visible (isa, opcode, i) == 0) |
| 12578 | break; |
| 12579 | file_name = as_where (&line); |
| 12580 | /* It is a constant and we called this function |
| 12581 | then we have to try to fit it. */ |
| 12582 | xtensa_insnbuf_set_operand (slotbuf, fmt, slot, opcode, i, |
| 12583 | exp->X_add_number, file_name, line); |
| 12584 | break; |
| 12585 | |
| 12586 | default: |
| 12587 | has_fixup = TRUE; |
| 12588 | break; |
| 12589 | } |
| 12590 | } |
| 12591 | |
| 12592 | return has_fixup; |
| 12593 | } |
| 12594 | |
| 12595 | |
| 12596 | /* Encode a single TInsn into an insnbuf. If the opcode can only be encoded |
| 12597 | into a multi-slot instruction, fill the other slots with NOPs. |
| 12598 | Return TRUE if there is a symbol in the immediate field. See also the |
| 12599 | assumptions listed for tinsn_to_slotbuf. */ |
| 12600 | |
| 12601 | static bfd_boolean |
| 12602 | tinsn_to_insnbuf (TInsn *tinsn, xtensa_insnbuf insnbuf) |
| 12603 | { |
| 12604 | static xtensa_insnbuf slotbuf = 0; |
| 12605 | static vliw_insn vinsn; |
| 12606 | xtensa_isa isa = xtensa_default_isa; |
| 12607 | bfd_boolean has_fixup = FALSE; |
| 12608 | int i; |
| 12609 | |
| 12610 | if (!slotbuf) |
| 12611 | { |
| 12612 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 12613 | xg_init_vinsn (&vinsn); |
| 12614 | } |
| 12615 | |
| 12616 | xg_clear_vinsn (&vinsn); |
| 12617 | |
| 12618 | bundle_tinsn (tinsn, &vinsn); |
| 12619 | |
| 12620 | xtensa_format_encode (isa, vinsn.format, insnbuf); |
| 12621 | |
| 12622 | for (i = 0; i < vinsn.num_slots; i++) |
| 12623 | { |
| 12624 | /* Only one slot may have a fix-up because the rest contains NOPs. */ |
| 12625 | has_fixup |= |
| 12626 | tinsn_to_slotbuf (vinsn.format, i, &vinsn.slots[i], vinsn.slotbuf[i]); |
| 12627 | xtensa_format_set_slot (isa, vinsn.format, i, insnbuf, vinsn.slotbuf[i]); |
| 12628 | } |
| 12629 | |
| 12630 | return has_fixup; |
| 12631 | } |
| 12632 | |
| 12633 | |
| 12634 | /* Check the instruction arguments. Return TRUE on failure. */ |
| 12635 | |
| 12636 | static bfd_boolean |
| 12637 | tinsn_check_arguments (const TInsn *insn) |
| 12638 | { |
| 12639 | xtensa_isa isa = xtensa_default_isa; |
| 12640 | xtensa_opcode opcode = insn->opcode; |
| 12641 | xtensa_regfile t1_regfile, t2_regfile; |
| 12642 | int t1_reg, t2_reg; |
| 12643 | int t1_base_reg, t1_last_reg; |
| 12644 | int t2_base_reg, t2_last_reg; |
| 12645 | char t1_inout, t2_inout; |
| 12646 | int i, j; |
| 12647 | |
| 12648 | if (opcode == XTENSA_UNDEFINED) |
| 12649 | { |
| 12650 | as_bad (_("invalid opcode")); |
| 12651 | return TRUE; |
| 12652 | } |
| 12653 | |
| 12654 | if (xtensa_opcode_num_operands (isa, opcode) > insn->ntok) |
| 12655 | { |
| 12656 | as_bad (_("too few operands")); |
| 12657 | return TRUE; |
| 12658 | } |
| 12659 | |
| 12660 | if (xtensa_opcode_num_operands (isa, opcode) < insn->ntok) |
| 12661 | { |
| 12662 | as_bad (_("too many operands")); |
| 12663 | return TRUE; |
| 12664 | } |
| 12665 | |
| 12666 | /* Check registers. */ |
| 12667 | for (j = 0; j < insn->ntok; j++) |
| 12668 | { |
| 12669 | if (xtensa_operand_is_register (isa, insn->opcode, j) != 1) |
| 12670 | continue; |
| 12671 | |
| 12672 | t2_regfile = xtensa_operand_regfile (isa, insn->opcode, j); |
| 12673 | t2_base_reg = insn->tok[j].X_add_number; |
| 12674 | t2_last_reg |
| 12675 | = t2_base_reg + xtensa_operand_num_regs (isa, insn->opcode, j); |
| 12676 | |
| 12677 | for (i = 0; i < insn->ntok; i++) |
| 12678 | { |
| 12679 | if (i == j) |
| 12680 | continue; |
| 12681 | |
| 12682 | if (xtensa_operand_is_register (isa, insn->opcode, i) != 1) |
| 12683 | continue; |
| 12684 | |
| 12685 | t1_regfile = xtensa_operand_regfile (isa, insn->opcode, i); |
| 12686 | |
| 12687 | if (t1_regfile != t2_regfile) |
| 12688 | continue; |
| 12689 | |
| 12690 | t1_inout = xtensa_operand_inout (isa, insn->opcode, i); |
| 12691 | t2_inout = xtensa_operand_inout (isa, insn->opcode, j); |
| 12692 | |
| 12693 | t1_base_reg = insn->tok[i].X_add_number; |
| 12694 | t1_last_reg = (t1_base_reg |
| 12695 | + xtensa_operand_num_regs (isa, insn->opcode, i)); |
| 12696 | |
| 12697 | for (t1_reg = t1_base_reg; t1_reg < t1_last_reg; t1_reg++) |
| 12698 | { |
| 12699 | for (t2_reg = t2_base_reg; t2_reg < t2_last_reg; t2_reg++) |
| 12700 | { |
| 12701 | if (t1_reg != t2_reg) |
| 12702 | continue; |
| 12703 | |
| 12704 | if (t1_inout != 'i' && t2_inout != 'i') |
| 12705 | { |
| 12706 | as_bad (_("multiple writes to the same register")); |
| 12707 | return TRUE; |
| 12708 | } |
| 12709 | } |
| 12710 | } |
| 12711 | } |
| 12712 | } |
| 12713 | return FALSE; |
| 12714 | } |
| 12715 | |
| 12716 | |
| 12717 | /* Load an instruction from its encoded form. */ |
| 12718 | |
| 12719 | static void |
| 12720 | tinsn_from_chars (TInsn *tinsn, char *f, int slot) |
| 12721 | { |
| 12722 | vliw_insn vinsn; |
| 12723 | |
| 12724 | xg_init_vinsn (&vinsn); |
| 12725 | vinsn_from_chars (&vinsn, f); |
| 12726 | |
| 12727 | *tinsn = vinsn.slots[slot]; |
| 12728 | xg_free_vinsn (&vinsn); |
| 12729 | } |
| 12730 | |
| 12731 | |
| 12732 | static void |
| 12733 | tinsn_from_insnbuf (TInsn *tinsn, |
| 12734 | xtensa_insnbuf slotbuf, |
| 12735 | xtensa_format fmt, |
| 12736 | int slot) |
| 12737 | { |
| 12738 | int i; |
| 12739 | xtensa_isa isa = xtensa_default_isa; |
| 12740 | |
| 12741 | /* Find the immed. */ |
| 12742 | tinsn_init (tinsn); |
| 12743 | tinsn->insn_type = ITYPE_INSN; |
| 12744 | tinsn->is_specific_opcode = FALSE; /* must not be specific */ |
| 12745 | tinsn->opcode = xtensa_opcode_decode (isa, fmt, slot, slotbuf); |
| 12746 | tinsn->ntok = xtensa_opcode_num_operands (isa, tinsn->opcode); |
| 12747 | for (i = 0; i < tinsn->ntok; i++) |
| 12748 | { |
| 12749 | set_expr_const (&tinsn->tok[i], |
| 12750 | xtensa_insnbuf_get_operand (slotbuf, fmt, slot, |
| 12751 | tinsn->opcode, i)); |
| 12752 | } |
| 12753 | } |
| 12754 | |
| 12755 | |
| 12756 | /* Read the value of the relaxable immed from the fr_symbol and fr_offset. */ |
| 12757 | |
| 12758 | static void |
| 12759 | tinsn_immed_from_frag (TInsn *tinsn, fragS *fragP, int slot) |
| 12760 | { |
| 12761 | xtensa_opcode opcode = tinsn->opcode; |
| 12762 | int opnum; |
| 12763 | |
| 12764 | if (fragP->tc_frag_data.slot_symbols[slot]) |
| 12765 | { |
| 12766 | opnum = get_relaxable_immed (opcode); |
| 12767 | gas_assert (opnum >= 0); |
| 12768 | set_expr_symbol_offset (&tinsn->tok[opnum], |
| 12769 | fragP->tc_frag_data.slot_symbols[slot], |
| 12770 | fragP->tc_frag_data.slot_offsets[slot]); |
| 12771 | } |
| 12772 | tinsn->extra_arg = fragP->tc_frag_data.free_reg[slot]; |
| 12773 | } |
| 12774 | |
| 12775 | |
| 12776 | static int |
| 12777 | get_num_stack_text_bytes (IStack *istack) |
| 12778 | { |
| 12779 | int i; |
| 12780 | int text_bytes = 0; |
| 12781 | |
| 12782 | for (i = 0; i < istack->ninsn; i++) |
| 12783 | { |
| 12784 | TInsn *tinsn = &istack->insn[i]; |
| 12785 | if (tinsn->insn_type == ITYPE_INSN) |
| 12786 | text_bytes += xg_get_single_size (tinsn->opcode); |
| 12787 | } |
| 12788 | return text_bytes; |
| 12789 | } |
| 12790 | |
| 12791 | |
| 12792 | static int |
| 12793 | get_num_stack_literal_bytes (IStack *istack) |
| 12794 | { |
| 12795 | int i; |
| 12796 | int lit_bytes = 0; |
| 12797 | |
| 12798 | for (i = 0; i < istack->ninsn; i++) |
| 12799 | { |
| 12800 | TInsn *tinsn = &istack->insn[i]; |
| 12801 | if (tinsn->insn_type == ITYPE_LITERAL && tinsn->ntok == 1) |
| 12802 | lit_bytes += 4; |
| 12803 | } |
| 12804 | return lit_bytes; |
| 12805 | } |
| 12806 | |
| 12807 | \f |
| 12808 | /* vliw_insn functions. */ |
| 12809 | |
| 12810 | static void |
| 12811 | xg_init_vinsn (vliw_insn *v) |
| 12812 | { |
| 12813 | int i; |
| 12814 | xtensa_isa isa = xtensa_default_isa; |
| 12815 | |
| 12816 | xg_clear_vinsn (v); |
| 12817 | |
| 12818 | v->insnbuf = xtensa_insnbuf_alloc (isa); |
| 12819 | if (v->insnbuf == NULL) |
| 12820 | as_fatal (_("out of memory")); |
| 12821 | |
| 12822 | for (i = 0; i < config_max_slots; i++) |
| 12823 | { |
| 12824 | v->slotbuf[i] = xtensa_insnbuf_alloc (isa); |
| 12825 | if (v->slotbuf[i] == NULL) |
| 12826 | as_fatal (_("out of memory")); |
| 12827 | } |
| 12828 | } |
| 12829 | |
| 12830 | |
| 12831 | static void |
| 12832 | xg_clear_vinsn (vliw_insn *v) |
| 12833 | { |
| 12834 | int i; |
| 12835 | |
| 12836 | memset (v, 0, offsetof (vliw_insn, slots) |
| 12837 | + sizeof(TInsn) * config_max_slots); |
| 12838 | |
| 12839 | v->format = XTENSA_UNDEFINED; |
| 12840 | v->num_slots = 0; |
| 12841 | v->inside_bundle = FALSE; |
| 12842 | |
| 12843 | if (xt_saved_debug_type != DEBUG_NONE) |
| 12844 | debug_type = xt_saved_debug_type; |
| 12845 | |
| 12846 | for (i = 0; i < config_max_slots; i++) |
| 12847 | v->slots[i].opcode = XTENSA_UNDEFINED; |
| 12848 | } |
| 12849 | |
| 12850 | |
| 12851 | static void |
| 12852 | xg_copy_vinsn (vliw_insn *dst, vliw_insn *src) |
| 12853 | { |
| 12854 | memcpy (dst, src, |
| 12855 | offsetof(vliw_insn, slots) + src->num_slots * sizeof(TInsn)); |
| 12856 | dst->insnbuf = src->insnbuf; |
| 12857 | memcpy (dst->slotbuf, src->slotbuf, src->num_slots * sizeof(xtensa_insnbuf)); |
| 12858 | } |
| 12859 | |
| 12860 | |
| 12861 | static bfd_boolean |
| 12862 | vinsn_has_specific_opcodes (vliw_insn *v) |
| 12863 | { |
| 12864 | int i; |
| 12865 | |
| 12866 | for (i = 0; i < v->num_slots; i++) |
| 12867 | { |
| 12868 | if (v->slots[i].is_specific_opcode) |
| 12869 | return TRUE; |
| 12870 | } |
| 12871 | return FALSE; |
| 12872 | } |
| 12873 | |
| 12874 | |
| 12875 | static void |
| 12876 | xg_free_vinsn (vliw_insn *v) |
| 12877 | { |
| 12878 | int i; |
| 12879 | xtensa_insnbuf_free (xtensa_default_isa, v->insnbuf); |
| 12880 | for (i = 0; i < config_max_slots; i++) |
| 12881 | xtensa_insnbuf_free (xtensa_default_isa, v->slotbuf[i]); |
| 12882 | } |
| 12883 | |
| 12884 | |
| 12885 | /* Encode a vliw_insn into an insnbuf. Return TRUE if there are any symbolic |
| 12886 | operands. See also the assumptions listed for tinsn_to_slotbuf. */ |
| 12887 | |
| 12888 | static bfd_boolean |
| 12889 | vinsn_to_insnbuf (vliw_insn *vinsn, |
| 12890 | char *frag_offset, |
| 12891 | fragS *fragP, |
| 12892 | bfd_boolean record_fixup) |
| 12893 | { |
| 12894 | xtensa_isa isa = xtensa_default_isa; |
| 12895 | xtensa_format fmt = vinsn->format; |
| 12896 | xtensa_insnbuf insnbuf = vinsn->insnbuf; |
| 12897 | int slot; |
| 12898 | bfd_boolean has_fixup = FALSE; |
| 12899 | |
| 12900 | xtensa_format_encode (isa, fmt, insnbuf); |
| 12901 | |
| 12902 | for (slot = 0; slot < vinsn->num_slots; slot++) |
| 12903 | { |
| 12904 | TInsn *tinsn = &vinsn->slots[slot]; |
| 12905 | expressionS *extra_arg = &tinsn->extra_arg; |
| 12906 | bfd_boolean tinsn_has_fixup = |
| 12907 | tinsn_to_slotbuf (vinsn->format, slot, tinsn, |
| 12908 | vinsn->slotbuf[slot]); |
| 12909 | |
| 12910 | xtensa_format_set_slot (isa, fmt, slot, |
| 12911 | insnbuf, vinsn->slotbuf[slot]); |
| 12912 | if (extra_arg->X_op != O_illegal && extra_arg->X_op != O_register) |
| 12913 | { |
| 12914 | if (vinsn->num_slots != 1) |
| 12915 | as_bad (_("TLS relocation not allowed in FLIX bundle")); |
| 12916 | else if (record_fixup) |
| 12917 | /* Instructions that generate TLS relocations should always be |
| 12918 | relaxed in the front-end. If "record_fixup" is set, then this |
| 12919 | function is being called during back-end relaxation, so flag |
| 12920 | the unexpected behavior as an error. */ |
| 12921 | as_bad (_("unexpected TLS relocation")); |
| 12922 | else |
| 12923 | fix_new (fragP, frag_offset - fragP->fr_literal, |
| 12924 | xtensa_format_length (isa, fmt), |
| 12925 | extra_arg->X_add_symbol, extra_arg->X_add_number, |
| 12926 | FALSE, map_operator_to_reloc (extra_arg->X_op, FALSE)); |
| 12927 | } |
| 12928 | if (tinsn_has_fixup) |
| 12929 | { |
| 12930 | int i; |
| 12931 | xtensa_opcode opcode = tinsn->opcode; |
| 12932 | int noperands = xtensa_opcode_num_operands (isa, opcode); |
| 12933 | has_fixup = TRUE; |
| 12934 | |
| 12935 | for (i = 0; i < noperands; i++) |
| 12936 | { |
| 12937 | expressionS* exp = &tinsn->tok[i]; |
| 12938 | switch (exp->X_op) |
| 12939 | { |
| 12940 | case O_symbol: |
| 12941 | case O_lo16: |
| 12942 | case O_hi16: |
| 12943 | if (get_relaxable_immed (opcode) == i) |
| 12944 | { |
| 12945 | /* Add a fix record for the instruction, except if this |
| 12946 | function is being called prior to relaxation, i.e., |
| 12947 | if record_fixup is false, and the instruction might |
| 12948 | be relaxed later. */ |
| 12949 | if (record_fixup |
| 12950 | || tinsn->is_specific_opcode |
| 12951 | || !xg_is_relaxable_insn (tinsn, 0)) |
| 12952 | { |
| 12953 | xg_add_opcode_fix (tinsn, i, fmt, slot, exp, fragP, |
| 12954 | frag_offset - fragP->fr_literal); |
| 12955 | } |
| 12956 | else |
| 12957 | { |
| 12958 | if (exp->X_op != O_symbol) |
| 12959 | as_bad (_("invalid operand")); |
| 12960 | tinsn->symbol = exp->X_add_symbol; |
| 12961 | tinsn->offset = exp->X_add_number; |
| 12962 | } |
| 12963 | } |
| 12964 | else |
| 12965 | as_bad (_("symbolic operand not allowed")); |
| 12966 | break; |
| 12967 | |
| 12968 | case O_constant: |
| 12969 | case O_register: |
| 12970 | break; |
| 12971 | |
| 12972 | default: |
| 12973 | as_bad (_("expression too complex")); |
| 12974 | break; |
| 12975 | } |
| 12976 | } |
| 12977 | } |
| 12978 | } |
| 12979 | |
| 12980 | return has_fixup; |
| 12981 | } |
| 12982 | |
| 12983 | |
| 12984 | static void |
| 12985 | vinsn_from_chars (vliw_insn *vinsn, char *f) |
| 12986 | { |
| 12987 | static xtensa_insnbuf insnbuf = NULL; |
| 12988 | static xtensa_insnbuf slotbuf = NULL; |
| 12989 | int i; |
| 12990 | xtensa_format fmt; |
| 12991 | xtensa_isa isa = xtensa_default_isa; |
| 12992 | |
| 12993 | if (!insnbuf) |
| 12994 | { |
| 12995 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 12996 | slotbuf = xtensa_insnbuf_alloc (isa); |
| 12997 | } |
| 12998 | |
| 12999 | xtensa_insnbuf_from_chars (isa, insnbuf, (unsigned char *) f, 0); |
| 13000 | fmt = xtensa_format_decode (isa, insnbuf); |
| 13001 | if (fmt == XTENSA_UNDEFINED) |
| 13002 | as_fatal (_("cannot decode instruction format")); |
| 13003 | vinsn->format = fmt; |
| 13004 | vinsn->num_slots = xtensa_format_num_slots (isa, fmt); |
| 13005 | |
| 13006 | for (i = 0; i < vinsn->num_slots; i++) |
| 13007 | { |
| 13008 | TInsn *tinsn = &vinsn->slots[i]; |
| 13009 | xtensa_format_get_slot (isa, fmt, i, insnbuf, slotbuf); |
| 13010 | tinsn_from_insnbuf (tinsn, slotbuf, fmt, i); |
| 13011 | } |
| 13012 | } |
| 13013 | |
| 13014 | \f |
| 13015 | /* Expression utilities. */ |
| 13016 | |
| 13017 | /* Return TRUE if the expression is an integer constant. */ |
| 13018 | |
| 13019 | bfd_boolean |
| 13020 | expr_is_const (const expressionS *s) |
| 13021 | { |
| 13022 | return (s->X_op == O_constant); |
| 13023 | } |
| 13024 | |
| 13025 | |
| 13026 | /* Get the expression constant. |
| 13027 | Calling this is illegal if expr_is_const () returns TRUE. */ |
| 13028 | |
| 13029 | offsetT |
| 13030 | get_expr_const (const expressionS *s) |
| 13031 | { |
| 13032 | gas_assert (expr_is_const (s)); |
| 13033 | return s->X_add_number; |
| 13034 | } |
| 13035 | |
| 13036 | |
| 13037 | /* Set the expression to a constant value. */ |
| 13038 | |
| 13039 | void |
| 13040 | set_expr_const (expressionS *s, offsetT val) |
| 13041 | { |
| 13042 | s->X_op = O_constant; |
| 13043 | s->X_add_number = val; |
| 13044 | s->X_add_symbol = NULL; |
| 13045 | s->X_op_symbol = NULL; |
| 13046 | } |
| 13047 | |
| 13048 | |
| 13049 | bfd_boolean |
| 13050 | expr_is_register (const expressionS *s) |
| 13051 | { |
| 13052 | return (s->X_op == O_register); |
| 13053 | } |
| 13054 | |
| 13055 | |
| 13056 | /* Get the expression constant. |
| 13057 | Calling this is illegal if expr_is_const () returns TRUE. */ |
| 13058 | |
| 13059 | offsetT |
| 13060 | get_expr_register (const expressionS *s) |
| 13061 | { |
| 13062 | gas_assert (expr_is_register (s)); |
| 13063 | return s->X_add_number; |
| 13064 | } |
| 13065 | |
| 13066 | |
| 13067 | /* Set the expression to a symbol + constant offset. */ |
| 13068 | |
| 13069 | void |
| 13070 | set_expr_symbol_offset (expressionS *s, symbolS *sym, offsetT offset) |
| 13071 | { |
| 13072 | s->X_op = O_symbol; |
| 13073 | s->X_add_symbol = sym; |
| 13074 | s->X_op_symbol = NULL; /* unused */ |
| 13075 | s->X_add_number = offset; |
| 13076 | } |
| 13077 | |
| 13078 | |
| 13079 | /* Return TRUE if the two expressions are equal. */ |
| 13080 | |
| 13081 | bfd_boolean |
| 13082 | expr_is_equal (expressionS *s1, expressionS *s2) |
| 13083 | { |
| 13084 | if (s1->X_op != s2->X_op) |
| 13085 | return FALSE; |
| 13086 | if (s1->X_add_symbol != s2->X_add_symbol) |
| 13087 | return FALSE; |
| 13088 | if (s1->X_op_symbol != s2->X_op_symbol) |
| 13089 | return FALSE; |
| 13090 | if (s1->X_add_number != s2->X_add_number) |
| 13091 | return FALSE; |
| 13092 | return TRUE; |
| 13093 | } |
| 13094 | |
| 13095 | |
| 13096 | static void |
| 13097 | copy_expr (expressionS *dst, const expressionS *src) |
| 13098 | { |
| 13099 | memcpy (dst, src, sizeof (expressionS)); |
| 13100 | } |
| 13101 | |
| 13102 | \f |
| 13103 | /* Support for the "--rename-section" option. */ |
| 13104 | |
| 13105 | struct rename_section_struct |
| 13106 | { |
| 13107 | char *old_name; |
| 13108 | char *new_name; |
| 13109 | struct rename_section_struct *next; |
| 13110 | }; |
| 13111 | |
| 13112 | static struct rename_section_struct *section_rename; |
| 13113 | |
| 13114 | |
| 13115 | /* Parse the string "oldname=new_name(:oldname2=new_name2)*" and add |
| 13116 | entries to the section_rename list. Note: Specifying multiple |
| 13117 | renamings separated by colons is not documented and is retained only |
| 13118 | for backward compatibility. */ |
| 13119 | |
| 13120 | static void |
| 13121 | build_section_rename (const char *arg) |
| 13122 | { |
| 13123 | struct rename_section_struct *r; |
| 13124 | char *this_arg = NULL; |
| 13125 | char *next_arg = NULL; |
| 13126 | |
| 13127 | for (this_arg = xstrdup (arg); this_arg != NULL; this_arg = next_arg) |
| 13128 | { |
| 13129 | char *old_name, *new_name; |
| 13130 | |
| 13131 | if (this_arg) |
| 13132 | { |
| 13133 | next_arg = strchr (this_arg, ':'); |
| 13134 | if (next_arg) |
| 13135 | { |
| 13136 | *next_arg = '\0'; |
| 13137 | next_arg++; |
| 13138 | } |
| 13139 | } |
| 13140 | |
| 13141 | old_name = this_arg; |
| 13142 | new_name = strchr (this_arg, '='); |
| 13143 | |
| 13144 | if (*old_name == '\0') |
| 13145 | { |
| 13146 | as_warn (_("ignoring extra '-rename-section' delimiter ':'")); |
| 13147 | continue; |
| 13148 | } |
| 13149 | if (!new_name || new_name[1] == '\0') |
| 13150 | { |
| 13151 | as_warn (_("ignoring invalid '-rename-section' specification: '%s'"), |
| 13152 | old_name); |
| 13153 | continue; |
| 13154 | } |
| 13155 | *new_name = '\0'; |
| 13156 | new_name++; |
| 13157 | |
| 13158 | /* Check for invalid section renaming. */ |
| 13159 | for (r = section_rename; r != NULL; r = r->next) |
| 13160 | { |
| 13161 | if (strcmp (r->old_name, old_name) == 0) |
| 13162 | as_bad (_("section %s renamed multiple times"), old_name); |
| 13163 | if (strcmp (r->new_name, new_name) == 0) |
| 13164 | as_bad (_("multiple sections remapped to output section %s"), |
| 13165 | new_name); |
| 13166 | } |
| 13167 | |
| 13168 | /* Now add it. */ |
| 13169 | r = (struct rename_section_struct *) |
| 13170 | xmalloc (sizeof (struct rename_section_struct)); |
| 13171 | r->old_name = xstrdup (old_name); |
| 13172 | r->new_name = xstrdup (new_name); |
| 13173 | r->next = section_rename; |
| 13174 | section_rename = r; |
| 13175 | } |
| 13176 | } |
| 13177 | |
| 13178 | |
| 13179 | char * |
| 13180 | xtensa_section_rename (char *name) |
| 13181 | { |
| 13182 | struct rename_section_struct *r = section_rename; |
| 13183 | |
| 13184 | for (r = section_rename; r != NULL; r = r->next) |
| 13185 | { |
| 13186 | if (strcmp (r->old_name, name) == 0) |
| 13187 | return r->new_name; |
| 13188 | } |
| 13189 | |
| 13190 | return name; |
| 13191 | } |