| 1 | /* tc-m32c.c -- Assembler for the Renesas M32C. |
| 2 | Copyright (C) 2005 Free Software Foundation. |
| 3 | Contributed by RedHat. |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include "as.h" |
| 24 | #include "subsegs.h" |
| 25 | #include "symcat.h" |
| 26 | #include "opcodes/m32c-desc.h" |
| 27 | #include "opcodes/m32c-opc.h" |
| 28 | #include "cgen.h" |
| 29 | #include "elf/common.h" |
| 30 | #include "elf/m32c.h" |
| 31 | #include "libbfd.h" |
| 32 | #include "libiberty.h" |
| 33 | #include "safe-ctype.h" |
| 34 | |
| 35 | /* Structure to hold all of the different components |
| 36 | describing an individual instruction. */ |
| 37 | typedef struct |
| 38 | { |
| 39 | const CGEN_INSN * insn; |
| 40 | const CGEN_INSN * orig_insn; |
| 41 | CGEN_FIELDS fields; |
| 42 | #if CGEN_INT_INSN_P |
| 43 | CGEN_INSN_INT buffer [1]; |
| 44 | #define INSN_VALUE(buf) (*(buf)) |
| 45 | #else |
| 46 | unsigned char buffer [CGEN_MAX_INSN_SIZE]; |
| 47 | #define INSN_VALUE(buf) (buf) |
| 48 | #endif |
| 49 | char * addr; |
| 50 | fragS * frag; |
| 51 | int num_fixups; |
| 52 | fixS * fixups [GAS_CGEN_MAX_FIXUPS]; |
| 53 | int indices [MAX_OPERAND_INSTANCES]; |
| 54 | } |
| 55 | m32c_insn; |
| 56 | |
| 57 | const char comment_chars[] = ";"; |
| 58 | const char line_comment_chars[] = "#"; |
| 59 | const char line_separator_chars[] = "|"; |
| 60 | const char EXP_CHARS[] = "eE"; |
| 61 | const char FLT_CHARS[] = "dD"; |
| 62 | \f |
| 63 | #define M32C_SHORTOPTS "" |
| 64 | const char * md_shortopts = M32C_SHORTOPTS; |
| 65 | |
| 66 | /* assembler options */ |
| 67 | #define OPTION_CPU_M16C (OPTION_MD_BASE) |
| 68 | #define OPTION_CPU_M32C (OPTION_MD_BASE + 1) |
| 69 | |
| 70 | struct option md_longopts[] = |
| 71 | { |
| 72 | { "m16c", no_argument, NULL, OPTION_CPU_M16C }, |
| 73 | { "m32c", no_argument, NULL, OPTION_CPU_M32C }, |
| 74 | {NULL, no_argument, NULL, 0} |
| 75 | }; |
| 76 | size_t md_longopts_size = sizeof (md_longopts); |
| 77 | |
| 78 | /* Default machine */ |
| 79 | |
| 80 | #define DEFAULT_MACHINE bfd_mach_m16c |
| 81 | #define DEFAULT_FLAGS EF_M32C_CPU_M16C |
| 82 | |
| 83 | static unsigned long m32c_mach = bfd_mach_m16c; |
| 84 | static int cpu_mach = (1 << MACH_M16C); |
| 85 | static int insn_size; |
| 86 | |
| 87 | /* Flags to set in the elf header */ |
| 88 | static flagword m32c_flags = DEFAULT_FLAGS; |
| 89 | |
| 90 | static unsigned int m32c_isa = (1 << ISA_M16C); |
| 91 | |
| 92 | static void |
| 93 | set_isa (enum isa_attr isa_num) |
| 94 | { |
| 95 | m32c_isa = (1 << isa_num); |
| 96 | } |
| 97 | |
| 98 | static void s_bss (int); |
| 99 | |
| 100 | int |
| 101 | md_parse_option (int c, char * arg ATTRIBUTE_UNUSED) |
| 102 | { |
| 103 | switch (c) |
| 104 | { |
| 105 | case OPTION_CPU_M16C: |
| 106 | m32c_flags = (m32c_flags & ~EF_M32C_CPU_MASK) | EF_M32C_CPU_M16C; |
| 107 | m32c_mach = bfd_mach_m16c; |
| 108 | cpu_mach = (1 << MACH_M16C); |
| 109 | set_isa (ISA_M16C); |
| 110 | break; |
| 111 | |
| 112 | case OPTION_CPU_M32C: |
| 113 | m32c_flags = (m32c_flags & ~EF_M32C_CPU_MASK) | EF_M32C_CPU_M32C; |
| 114 | m32c_mach = bfd_mach_m32c; |
| 115 | cpu_mach = (1 << MACH_M32C); |
| 116 | set_isa (ISA_M32C); |
| 117 | break; |
| 118 | |
| 119 | default: |
| 120 | return 0; |
| 121 | } |
| 122 | return 1; |
| 123 | } |
| 124 | |
| 125 | void |
| 126 | md_show_usage (FILE * stream) |
| 127 | { |
| 128 | fprintf (stream, _(" M32C specific command line options:\n")); |
| 129 | } |
| 130 | |
| 131 | static void |
| 132 | s_bss (int ignore ATTRIBUTE_UNUSED) |
| 133 | { |
| 134 | int temp; |
| 135 | |
| 136 | temp = get_absolute_expression (); |
| 137 | subseg_set (bss_section, (subsegT) temp); |
| 138 | demand_empty_rest_of_line (); |
| 139 | } |
| 140 | |
| 141 | /* The target specific pseudo-ops which we support. */ |
| 142 | const pseudo_typeS md_pseudo_table[] = |
| 143 | { |
| 144 | { "bss", s_bss, 0}, |
| 145 | { "word", cons, 4 }, |
| 146 | { NULL, NULL, 0 } |
| 147 | }; |
| 148 | |
| 149 | \f |
| 150 | void |
| 151 | md_begin (void) |
| 152 | { |
| 153 | /* Initialize the `cgen' interface. */ |
| 154 | |
| 155 | /* Set the machine number and endian. */ |
| 156 | gas_cgen_cpu_desc = m32c_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, cpu_mach, |
| 157 | CGEN_CPU_OPEN_ENDIAN, |
| 158 | CGEN_ENDIAN_BIG, |
| 159 | CGEN_CPU_OPEN_ISAS, & m32c_isa, |
| 160 | CGEN_CPU_OPEN_END); |
| 161 | |
| 162 | m32c_cgen_init_asm (gas_cgen_cpu_desc); |
| 163 | |
| 164 | /* This is a callback from cgen to gas to parse operands. */ |
| 165 | cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); |
| 166 | |
| 167 | /* Set the ELF flags if desired. */ |
| 168 | if (m32c_flags) |
| 169 | bfd_set_private_flags (stdoutput, m32c_flags); |
| 170 | |
| 171 | /* Set the machine type */ |
| 172 | bfd_default_set_arch_mach (stdoutput, bfd_arch_m32c, m32c_mach); |
| 173 | |
| 174 | insn_size = 0; |
| 175 | } |
| 176 | |
| 177 | void |
| 178 | m32c_md_end (void) |
| 179 | { |
| 180 | int i, n_nops; |
| 181 | |
| 182 | /* Pad with nops for objdump. */ |
| 183 | n_nops = (32 - ((insn_size) % 32)) / 8; |
| 184 | for (i = 1; i <= n_nops; i++) |
| 185 | md_assemble ("nop"); |
| 186 | } |
| 187 | |
| 188 | void |
| 189 | m32c_start_line_hook (void) |
| 190 | { |
| 191 | #if 0 /* not necessary....handled in the .cpu file */ |
| 192 | char *s = input_line_pointer; |
| 193 | char *sg; |
| 194 | |
| 195 | for (s = input_line_pointer ; s && s[0] != '\n'; s++) |
| 196 | { |
| 197 | if (s[0] == ':') |
| 198 | { |
| 199 | /* Remove :g suffix. Squeeze out blanks. */ |
| 200 | if (s[1] == 'g') |
| 201 | { |
| 202 | for (sg = s - 1; sg && sg >= input_line_pointer; sg--) |
| 203 | { |
| 204 | sg[2] = sg[0]; |
| 205 | } |
| 206 | sg[1] = ' '; |
| 207 | sg[2] = ' '; |
| 208 | input_line_pointer += 2; |
| 209 | } |
| 210 | } |
| 211 | } |
| 212 | #endif |
| 213 | } |
| 214 | |
| 215 | /* Process [[indirect-operands]] in instruction str. */ |
| 216 | |
| 217 | static bfd_boolean |
| 218 | m32c_indirect_operand (char *str) |
| 219 | { |
| 220 | char *new_str; |
| 221 | char *s; |
| 222 | char *ns; |
| 223 | int ns_len; |
| 224 | char *ns_end; |
| 225 | enum indirect_type {none, relative, absolute} ; |
| 226 | enum indirect_type indirection [3] = { none, none, none }; |
| 227 | int brace_n [3] = { 0, 0, 0 }; |
| 228 | int operand; |
| 229 | |
| 230 | s = str; |
| 231 | operand = 1; |
| 232 | for (s = str; *s; s++) |
| 233 | { |
| 234 | if (s[0] == ',') |
| 235 | operand = 2; |
| 236 | /* [abs] where abs is not a0 or a1 */ |
| 237 | if (s[1] == '[' && ! (s[2] == 'a' && (s[3] == '0' || s[3] == '1')) |
| 238 | && (ISBLANK (s[0]) || s[0] == ',')) |
| 239 | indirection[operand] = absolute; |
| 240 | if (s[0] == ']' && s[1] == ']') |
| 241 | indirection[operand] = relative; |
| 242 | if (s[0] == '[' && s[1] == '[') |
| 243 | indirection[operand] = relative; |
| 244 | } |
| 245 | |
| 246 | if (indirection[1] == none && indirection[2] == none) |
| 247 | return FALSE; |
| 248 | |
| 249 | operand = 1; |
| 250 | ns_len = strlen (str); |
| 251 | new_str = (char*) xmalloc (ns_len); |
| 252 | ns = new_str; |
| 253 | ns_end = ns + ns_len; |
| 254 | |
| 255 | for (s = str; *s; s++) |
| 256 | { |
| 257 | if (s[0] == ',') |
| 258 | operand = 2; |
| 259 | |
| 260 | if (s[0] == '[' && ! brace_n[operand]) |
| 261 | { |
| 262 | brace_n[operand] += 1; |
| 263 | /* Squeeze [[ to [ if this is an indirect operand. */ |
| 264 | if (indirection[operand] != none) |
| 265 | continue; |
| 266 | } |
| 267 | |
| 268 | else if (s[0] == '[' && brace_n[operand]) |
| 269 | { |
| 270 | brace_n[operand] += 1; |
| 271 | } |
| 272 | else if (s[0] == ']' && s[1] == ']' && indirection[operand] == relative) |
| 273 | { |
| 274 | s += 1; /* skip one ]. */ |
| 275 | brace_n[operand] -= 2; /* allow for 2 [. */ |
| 276 | } |
| 277 | else if (s[0] == ']' && indirection[operand] == absolute) |
| 278 | { |
| 279 | brace_n[operand] -= 1; |
| 280 | continue; /* skip closing ]. */ |
| 281 | } |
| 282 | else if (s[0] == ']') |
| 283 | { |
| 284 | brace_n[operand] -= 1; |
| 285 | } |
| 286 | *ns = s[0]; |
| 287 | ns += 1; |
| 288 | if (ns >= ns_end) |
| 289 | return FALSE; |
| 290 | if (s[0] == 0) |
| 291 | break; |
| 292 | } |
| 293 | *ns = '\0'; |
| 294 | for (operand = 1; operand <= 2; operand++) |
| 295 | if (brace_n[operand]) |
| 296 | { |
| 297 | fprintf (stderr, "Unmatched [[operand-%d]] %d\n", operand, brace_n[operand]); |
| 298 | } |
| 299 | |
| 300 | if (indirection[1] != none && indirection[2] != none) |
| 301 | md_assemble ("src-dest-indirect"); |
| 302 | else if (indirection[1] != none) |
| 303 | md_assemble ("src-indirect"); |
| 304 | else if (indirection[2] != none) |
| 305 | md_assemble ("dest-indirect"); |
| 306 | |
| 307 | md_assemble (new_str); |
| 308 | free (new_str); |
| 309 | return TRUE; |
| 310 | } |
| 311 | |
| 312 | void |
| 313 | md_assemble (char * str) |
| 314 | { |
| 315 | static int last_insn_had_delay_slot = 0; |
| 316 | m32c_insn insn; |
| 317 | char * errmsg; |
| 318 | |
| 319 | if (m32c_mach == bfd_mach_m32c && m32c_indirect_operand (str)) |
| 320 | return; |
| 321 | |
| 322 | /* Initialize GAS's cgen interface for a new instruction. */ |
| 323 | gas_cgen_init_parse (); |
| 324 | |
| 325 | insn.insn = m32c_cgen_assemble_insn |
| 326 | (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); |
| 327 | |
| 328 | if (!insn.insn) |
| 329 | { |
| 330 | as_bad (errmsg); |
| 331 | return; |
| 332 | } |
| 333 | |
| 334 | /* Doesn't really matter what we pass for RELAX_P here. */ |
| 335 | gas_cgen_finish_insn (insn.insn, insn.buffer, |
| 336 | CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); |
| 337 | |
| 338 | last_insn_had_delay_slot |
| 339 | = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT); |
| 340 | insn_size = CGEN_INSN_BITSIZE(insn.insn); |
| 341 | } |
| 342 | |
| 343 | /* The syntax in the manual says constants begin with '#'. |
| 344 | We just ignore it. */ |
| 345 | |
| 346 | void |
| 347 | md_operand (expressionS * exp) |
| 348 | { |
| 349 | /* In case of a syntax error, escape back to try next syntax combo. */ |
| 350 | if (exp->X_op == O_absent) |
| 351 | gas_cgen_md_operand (exp); |
| 352 | } |
| 353 | |
| 354 | valueT |
| 355 | md_section_align (segT segment, valueT size) |
| 356 | { |
| 357 | int align = bfd_get_section_alignment (stdoutput, segment); |
| 358 | return ((size + (1 << align) - 1) & (-1 << align)); |
| 359 | } |
| 360 | |
| 361 | symbolS * |
| 362 | md_undefined_symbol (char * name ATTRIBUTE_UNUSED) |
| 363 | { |
| 364 | return 0; |
| 365 | } |
| 366 | \f |
| 367 | const relax_typeS md_relax_table[] = |
| 368 | { |
| 369 | /* The fields are: |
| 370 | 1) most positive reach of this state, |
| 371 | 2) most negative reach of this state, |
| 372 | 3) how many bytes this mode will have in the variable part of the frag |
| 373 | 4) which index into the table to try if we can't fit into this one. */ |
| 374 | |
| 375 | /* 0 */ { 0, 0, 0, 0 }, /* unused */ |
| 376 | /* 1 */ { 0, 0, 0, 0 }, /* marker for "don't know yet" */ |
| 377 | |
| 378 | /* 2 */ { 127, -128, 2, 3 }, /* jcnd16_5.b */ |
| 379 | /* 3 */ { 32767, -32768, 5, 4 }, /* jcnd16_5.w */ |
| 380 | /* 4 */ { 0, 0, 6, 0 }, /* jcnd16_5.a */ |
| 381 | |
| 382 | /* 5 */ { 127, -128, 2, 6 }, /* jcnd16.b */ |
| 383 | /* 6 */ { 32767, -32768, 5, 7 }, /* jcnd16.w */ |
| 384 | /* 7 */ { 0, 0, 6, 0 }, /* jcnd16.a */ |
| 385 | |
| 386 | /* 8 */ { 8, 1, 1, 9 }, /* jmp16.s */ |
| 387 | /* 9 */ { 127, -128, 2, 10 }, /* jmp16.b */ |
| 388 | /* 10 */ { 32767, -32768, 3, 11 }, /* jmp16.w */ |
| 389 | /* 11 */ { 0, 0, 4, 0 }, /* jmp16.a */ |
| 390 | |
| 391 | /* 12 */ { 127, -128, 2, 13 }, /* jcnd32.b */ |
| 392 | /* 13 */ { 32767, -32768, 5, 14 }, /* jcnd32.w */ |
| 393 | /* 14 */ { 0, 0, 6, 0 }, /* jcnd32.a */ |
| 394 | |
| 395 | /* 15 */ { 8, 1, 1, 16 }, /* jmp32.s */ |
| 396 | /* 16 */ { 127, -128, 2, 17 }, /* jmp32.b */ |
| 397 | /* 17 */ { 32767, -32768, 3, 18 }, /* jmp32.w */ |
| 398 | /* 18 */ { 0, 0, 4, 0 } /* jmp32.a */ |
| 399 | }; |
| 400 | |
| 401 | enum { |
| 402 | M32C_MACRO_JCND16_5_W, |
| 403 | M32C_MACRO_JCND16_5_A, |
| 404 | M32C_MACRO_JCND16_W, |
| 405 | M32C_MACRO_JCND16_A, |
| 406 | M32C_MACRO_JCND32_W, |
| 407 | M32C_MACRO_JCND32_A, |
| 408 | } M32C_Macros; |
| 409 | |
| 410 | static struct { |
| 411 | int insn; |
| 412 | int bytes; |
| 413 | int insn_for_extern; |
| 414 | int pcrel_aim_offset; |
| 415 | } subtype_mappings[] = { |
| 416 | /* 0 */ { 0, 0, 0, 0 }, |
| 417 | /* 1 */ { 0, 0, 0, 0 }, |
| 418 | |
| 419 | /* 2 */ { M32C_INSN_JCND16_5, 2, -M32C_MACRO_JCND16_5_A, 1 }, |
| 420 | /* 3 */ { -M32C_MACRO_JCND16_5_W, 5, -M32C_MACRO_JCND16_5_A, 4 }, |
| 421 | /* 4 */ { -M32C_MACRO_JCND16_5_A, 6, -M32C_MACRO_JCND16_5_A, 0 }, |
| 422 | |
| 423 | /* 5 */ { M32C_INSN_JCND16, 3, -M32C_MACRO_JCND16_A, 1 }, |
| 424 | /* 6 */ { -M32C_MACRO_JCND16_W, 6, -M32C_MACRO_JCND16_A, 4 }, |
| 425 | /* 7 */ { -M32C_MACRO_JCND16_A, 7, -M32C_MACRO_JCND16_A, 0 }, |
| 426 | |
| 427 | /* 8 */ { M32C_INSN_JMP16_S, 1, M32C_INSN_JMP16_A, 0 }, |
| 428 | /* 9 */ { M32C_INSN_JMP16_B, 2, M32C_INSN_JMP16_A, 1 }, |
| 429 | /* 10 */ { M32C_INSN_JMP16_W, 3, M32C_INSN_JMP16_A, 2 }, |
| 430 | /* 11 */ { M32C_INSN_JMP16_A, 4, M32C_INSN_JMP16_A, 0 }, |
| 431 | |
| 432 | /* 12 */ { M32C_INSN_JCND32, 2, -M32C_MACRO_JCND32_A, 1 }, |
| 433 | /* 13 */ { -M32C_MACRO_JCND32_W, 5, -M32C_MACRO_JCND32_A, 4 }, |
| 434 | /* 14 */ { -M32C_MACRO_JCND32_A, 6, -M32C_MACRO_JCND32_A, 0 }, |
| 435 | |
| 436 | /* 15 */ { M32C_INSN_JMP32_S, 1, M32C_INSN_JMP32_A, 0 }, |
| 437 | /* 16 */ { M32C_INSN_JMP32_B, 2, M32C_INSN_JMP32_A, 1 }, |
| 438 | /* 17 */ { M32C_INSN_JMP32_W, 3, M32C_INSN_JMP32_A, 2 }, |
| 439 | /* 18 */ { M32C_INSN_JMP32_A, 4, M32C_INSN_JMP32_A, 0 } |
| 440 | }; |
| 441 | #define NUM_MAPPINGS (sizeof (subtype_mappings) / sizeof (subtype_mappings[0])) |
| 442 | |
| 443 | void |
| 444 | m32c_prepare_relax_scan (fragS *fragP, offsetT *aim, relax_substateT this_state) |
| 445 | { |
| 446 | symbolS *symbolP = fragP->fr_symbol; |
| 447 | if (symbolP && !S_IS_DEFINED (symbolP)) |
| 448 | *aim = 0; |
| 449 | /* Adjust for m32c pcrel not being relative to the next opcode. */ |
| 450 | *aim += subtype_mappings[this_state].pcrel_aim_offset; |
| 451 | } |
| 452 | |
| 453 | static int |
| 454 | insn_to_subtype (int insn) |
| 455 | { |
| 456 | unsigned int i; |
| 457 | for (i=0; i<NUM_MAPPINGS; i++) |
| 458 | if (insn == subtype_mappings[i].insn) |
| 459 | { |
| 460 | /*printf("mapping %d used\n", i);*/ |
| 461 | return i; |
| 462 | } |
| 463 | abort (); |
| 464 | } |
| 465 | |
| 466 | /* Return an initial guess of the length by which a fragment must grow to |
| 467 | hold a branch to reach its destination. |
| 468 | Also updates fr_type/fr_subtype as necessary. |
| 469 | |
| 470 | Called just before doing relaxation. |
| 471 | Any symbol that is now undefined will not become defined. |
| 472 | The guess for fr_var is ACTUALLY the growth beyond fr_fix. |
| 473 | Whatever we do to grow fr_fix or fr_var contributes to our returned value. |
| 474 | Although it may not be explicit in the frag, pretend fr_var starts with a |
| 475 | 0 value. */ |
| 476 | |
| 477 | int |
| 478 | md_estimate_size_before_relax (fragS * fragP, segT segment ATTRIBUTE_UNUSED) |
| 479 | { |
| 480 | int where = fragP->fr_opcode - fragP->fr_literal; |
| 481 | |
| 482 | if (fragP->fr_subtype == 1) |
| 483 | fragP->fr_subtype = insn_to_subtype (fragP->fr_cgen.insn->base->num); |
| 484 | |
| 485 | if (S_GET_SEGMENT (fragP->fr_symbol) != segment) |
| 486 | { |
| 487 | int new_insn; |
| 488 | |
| 489 | new_insn = subtype_mappings[fragP->fr_subtype].insn_for_extern; |
| 490 | fragP->fr_subtype = insn_to_subtype (new_insn); |
| 491 | } |
| 492 | |
| 493 | if (fragP->fr_cgen.insn->base |
| 494 | && fragP->fr_cgen.insn->base->num |
| 495 | != subtype_mappings[fragP->fr_subtype].insn |
| 496 | && subtype_mappings[fragP->fr_subtype].insn > 0) |
| 497 | { |
| 498 | int new_insn= subtype_mappings[fragP->fr_subtype].insn; |
| 499 | if (new_insn >= 0) |
| 500 | { |
| 501 | fragP->fr_cgen.insn = (fragP->fr_cgen.insn |
| 502 | - fragP->fr_cgen.insn->base->num |
| 503 | + new_insn); |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | return subtype_mappings[fragP->fr_subtype].bytes - (fragP->fr_fix - where); |
| 508 | } |
| 509 | |
| 510 | /* *fragP has been relaxed to its final size, and now needs to have |
| 511 | the bytes inside it modified to conform to the new size. |
| 512 | |
| 513 | Called after relaxation is finished. |
| 514 | fragP->fr_type == rs_machine_dependent. |
| 515 | fragP->fr_subtype is the subtype of what the address relaxed to. */ |
| 516 | |
| 517 | static int |
| 518 | target_address_for (fragS *frag) |
| 519 | { |
| 520 | int rv = frag->fr_offset; |
| 521 | symbolS *sym = frag->fr_symbol; |
| 522 | |
| 523 | if (sym) |
| 524 | rv += S_GET_VALUE (sym); |
| 525 | |
| 526 | /*printf("target_address_for returns %d\n", rv);*/ |
| 527 | return rv; |
| 528 | } |
| 529 | |
| 530 | void |
| 531 | md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED, |
| 532 | segT sec ATTRIBUTE_UNUSED, |
| 533 | fragS * fragP ATTRIBUTE_UNUSED) |
| 534 | { |
| 535 | int addend; |
| 536 | int operand; |
| 537 | int new_insn; |
| 538 | int where = fragP->fr_opcode - fragP->fr_literal; |
| 539 | unsigned char *op = (unsigned char *)fragP->fr_opcode; |
| 540 | |
| 541 | addend = target_address_for (fragP) - (fragP->fr_address + where); |
| 542 | new_insn = subtype_mappings[fragP->fr_subtype].insn; |
| 543 | |
| 544 | fragP->fr_fix = where + subtype_mappings[fragP->fr_subtype].bytes; |
| 545 | |
| 546 | switch (subtype_mappings[fragP->fr_subtype].insn) |
| 547 | { |
| 548 | case M32C_INSN_JCND16_5: |
| 549 | op[1] = addend - 1; |
| 550 | operand = M32C_OPERAND_LAB_8_8; |
| 551 | break; |
| 552 | |
| 553 | case -M32C_MACRO_JCND16_5_W: |
| 554 | op[0] ^= 0x04; |
| 555 | op[1] = 4; |
| 556 | op[2] = 0xf4; |
| 557 | op[3] = addend - 3; |
| 558 | op[4] = (addend - 3) >> 8; |
| 559 | operand = M32C_OPERAND_LAB_8_16; |
| 560 | where += 2; |
| 561 | new_insn = M32C_INSN_JMP16_W; |
| 562 | break; |
| 563 | |
| 564 | case -M32C_MACRO_JCND16_5_A: |
| 565 | op[0] ^= 0x04; |
| 566 | op[1] = 5; |
| 567 | op[2] = 0xfc; |
| 568 | operand = M32C_OPERAND_LAB_8_24; |
| 569 | where += 2; |
| 570 | new_insn = M32C_INSN_JMP16_A; |
| 571 | break; |
| 572 | |
| 573 | |
| 574 | case M32C_INSN_JCND16: |
| 575 | op[2] = addend - 2; |
| 576 | operand = M32C_OPERAND_LAB_16_8; |
| 577 | break; |
| 578 | |
| 579 | case -M32C_MACRO_JCND16_W: |
| 580 | op[1] ^= 0x04; |
| 581 | op[2] = 4; |
| 582 | op[3] = 0xf4; |
| 583 | op[4] = addend - 4; |
| 584 | op[5] = (addend - 4) >> 8; |
| 585 | operand = M32C_OPERAND_LAB_8_16; |
| 586 | where += 3; |
| 587 | new_insn = M32C_INSN_JMP16_W; |
| 588 | break; |
| 589 | |
| 590 | case -M32C_MACRO_JCND16_A: |
| 591 | op[1] ^= 0x04; |
| 592 | op[2] = 5; |
| 593 | op[3] = 0xfc; |
| 594 | operand = M32C_OPERAND_LAB_8_24; |
| 595 | where += 3; |
| 596 | new_insn = M32C_INSN_JMP16_A; |
| 597 | break; |
| 598 | |
| 599 | case M32C_INSN_JMP16_S: |
| 600 | op[0] = 0x60 | ((addend-2) & 0x07); |
| 601 | operand = M32C_OPERAND_LAB_5_3; |
| 602 | break; |
| 603 | |
| 604 | case M32C_INSN_JMP16_B: |
| 605 | op[0] = 0xfe; |
| 606 | op[1] = addend - 1; |
| 607 | operand = M32C_OPERAND_LAB_8_8; |
| 608 | break; |
| 609 | |
| 610 | case M32C_INSN_JMP16_W: |
| 611 | op[0] = 0xf4; |
| 612 | op[1] = addend - 1; |
| 613 | op[2] = (addend - 1) >> 8; |
| 614 | operand = M32C_OPERAND_LAB_8_16; |
| 615 | break; |
| 616 | |
| 617 | case M32C_INSN_JMP16_A: |
| 618 | op[0] = 0xfc; |
| 619 | op[1] = 0; |
| 620 | op[2] = 0; |
| 621 | op[3] = 0; |
| 622 | operand = M32C_OPERAND_LAB_8_24; |
| 623 | break; |
| 624 | |
| 625 | case M32C_INSN_JCND32: |
| 626 | op[1] = addend - 1; |
| 627 | operand = M32C_OPERAND_LAB_8_8; |
| 628 | break; |
| 629 | |
| 630 | case -M32C_MACRO_JCND32_W: |
| 631 | op[0] ^= 0x40; |
| 632 | op[1] = 4; |
| 633 | op[2] = 0xce; |
| 634 | op[3] = addend - 3; |
| 635 | op[4] = (addend - 3) >> 8; |
| 636 | operand = M32C_OPERAND_LAB_8_16; |
| 637 | where += 2; |
| 638 | new_insn = M32C_INSN_JMP32_W; |
| 639 | break; |
| 640 | |
| 641 | case -M32C_MACRO_JCND32_A: |
| 642 | op[0] ^= 0x40; |
| 643 | op[1] = 5; |
| 644 | op[2] = 0xcc; |
| 645 | operand = M32C_OPERAND_LAB_8_24; |
| 646 | where += 2; |
| 647 | new_insn = M32C_INSN_JMP32_A; |
| 648 | break; |
| 649 | |
| 650 | |
| 651 | |
| 652 | case M32C_INSN_JMP32_S: |
| 653 | addend = ((addend-2) & 0x07); |
| 654 | op[0] = 0x4a | (addend & 0x01) | ((addend << 3) & 0x30); |
| 655 | operand = M32C_OPERAND_LAB32_JMP_S; |
| 656 | break; |
| 657 | |
| 658 | case M32C_INSN_JMP32_B: |
| 659 | op[0] = 0xbb; |
| 660 | op[1] = addend - 1; |
| 661 | operand = M32C_OPERAND_LAB_8_8; |
| 662 | break; |
| 663 | |
| 664 | case M32C_INSN_JMP32_W: |
| 665 | op[0] = 0xce; |
| 666 | op[1] = addend - 1; |
| 667 | op[2] = (addend - 1) >> 8; |
| 668 | operand = M32C_OPERAND_LAB_8_16; |
| 669 | break; |
| 670 | |
| 671 | case M32C_INSN_JMP32_A: |
| 672 | op[0] = 0xcc; |
| 673 | op[1] = 0; |
| 674 | op[2] = 0; |
| 675 | op[3] = 0; |
| 676 | operand = M32C_OPERAND_LAB_8_24; |
| 677 | break; |
| 678 | |
| 679 | |
| 680 | default: |
| 681 | printf("\nHey! Need more opcode converters! missing: %d %s\n\n", |
| 682 | fragP->fr_subtype, |
| 683 | fragP->fr_cgen.insn->base->name); |
| 684 | abort(); |
| 685 | } |
| 686 | |
| 687 | if (S_GET_SEGMENT (fragP->fr_symbol) != sec |
| 688 | || operand == M32C_OPERAND_LAB_8_24) |
| 689 | { |
| 690 | assert (fragP->fr_cgen.insn != 0); |
| 691 | gas_cgen_record_fixup (fragP, |
| 692 | where, |
| 693 | fragP->fr_cgen.insn, |
| 694 | (fragP->fr_fix - where) * 8, |
| 695 | cgen_operand_lookup_by_num (gas_cgen_cpu_desc, |
| 696 | operand), |
| 697 | fragP->fr_cgen.opinfo, |
| 698 | fragP->fr_symbol, fragP->fr_offset); |
| 699 | } |
| 700 | } |
| 701 | \f |
| 702 | /* Functions concerning relocs. */ |
| 703 | |
| 704 | /* The location from which a PC relative jump should be calculated, |
| 705 | given a PC relative reloc. */ |
| 706 | |
| 707 | long |
| 708 | md_pcrel_from_section (fixS * fixP, segT sec) |
| 709 | { |
| 710 | if (fixP->fx_addsy != (symbolS *) NULL |
| 711 | && (! S_IS_DEFINED (fixP->fx_addsy) |
| 712 | || S_GET_SEGMENT (fixP->fx_addsy) != sec)) |
| 713 | /* The symbol is undefined (or is defined but not in this section). |
| 714 | Let the linker figure it out. */ |
| 715 | return 0; |
| 716 | |
| 717 | return (fixP->fx_frag->fr_address + fixP->fx_where); |
| 718 | } |
| 719 | |
| 720 | /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. |
| 721 | Returns BFD_RELOC_NONE if no reloc type can be found. |
| 722 | *FIXP may be modified if desired. */ |
| 723 | |
| 724 | bfd_reloc_code_real_type |
| 725 | md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED, |
| 726 | const CGEN_OPERAND * operand, |
| 727 | fixS * fixP ATTRIBUTE_UNUSED) |
| 728 | { |
| 729 | static const struct op_reloc { |
| 730 | /* A CGEN operand type that can be a relocatable expression. */ |
| 731 | CGEN_OPERAND_TYPE operand; |
| 732 | |
| 733 | /* The appropriate BFD reloc type to use for that. */ |
| 734 | bfd_reloc_code_real_type reloc; |
| 735 | |
| 736 | /* The offset from the start of the instruction to the field to be |
| 737 | relocated, in bytes. */ |
| 738 | int offset; |
| 739 | } op_reloc_table[] = { |
| 740 | |
| 741 | /* Absolute relocs for 16-bit fields. */ |
| 742 | { M32C_OPERAND_IMM_16_HI, BFD_RELOC_16, 2 }, |
| 743 | { M32C_OPERAND_IMM_24_HI, BFD_RELOC_16, 3 }, |
| 744 | { M32C_OPERAND_IMM_32_HI, BFD_RELOC_16, 4 }, |
| 745 | { M32C_OPERAND_DSP_16_S16, BFD_RELOC_16, 2 }, |
| 746 | { M32C_OPERAND_DSP_24_S16, BFD_RELOC_16, 3 }, |
| 747 | { M32C_OPERAND_DSP_32_S16, BFD_RELOC_16, 4 }, |
| 748 | { M32C_OPERAND_DSP_40_S16, BFD_RELOC_16, 5 }, |
| 749 | { M32C_OPERAND_DSP_8_U16, BFD_RELOC_16, 1 }, |
| 750 | { M32C_OPERAND_DSP_16_U16, BFD_RELOC_16, 2 }, |
| 751 | { M32C_OPERAND_DSP_24_U16, BFD_RELOC_16, 3 }, |
| 752 | { M32C_OPERAND_DSP_32_U16, BFD_RELOC_16, 4 }, |
| 753 | |
| 754 | /* Absolute relocs for 24-bit fields. */ |
| 755 | { M32C_OPERAND_LAB_8_24, BFD_RELOC_24, 1 }, |
| 756 | { M32C_OPERAND_DSP_16_U24, BFD_RELOC_24, 2 }, |
| 757 | { M32C_OPERAND_DSP_24_U24, BFD_RELOC_24, 3 }, |
| 758 | { M32C_OPERAND_DSP_32_U24, BFD_RELOC_24, 4 }, |
| 759 | { M32C_OPERAND_DSP_40_U24, BFD_RELOC_24, 5 }, |
| 760 | |
| 761 | /* Absolute relocs for 32-bit fields. */ |
| 762 | { M32C_OPERAND_IMM_16_SI, BFD_RELOC_32, 2 }, |
| 763 | { M32C_OPERAND_IMM_24_SI, BFD_RELOC_32, 3 }, |
| 764 | { M32C_OPERAND_IMM_32_SI, BFD_RELOC_32, 4 }, |
| 765 | { M32C_OPERAND_IMM_40_SI, BFD_RELOC_32, 5 }, |
| 766 | |
| 767 | }; |
| 768 | |
| 769 | int i; |
| 770 | |
| 771 | for (i = ARRAY_SIZE (op_reloc_table); --i >= 0; ) |
| 772 | { |
| 773 | const struct op_reloc *or = &op_reloc_table[i]; |
| 774 | |
| 775 | if (or->operand == operand->type) |
| 776 | { |
| 777 | fixP->fx_where += or->offset; |
| 778 | fixP->fx_size -= or->offset; |
| 779 | return or->reloc; |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | fprintf |
| 784 | (stderr, |
| 785 | "Error: tc-m32c.c:md_cgen_lookup_reloc Unimplemented relocation %d\n", |
| 786 | operand->type); |
| 787 | |
| 788 | return BFD_RELOC_NONE; |
| 789 | } |
| 790 | |
| 791 | /* See whether we need to force a relocation into the output file. |
| 792 | This is used to force out switch and PC relative relocations when |
| 793 | relaxing. */ |
| 794 | |
| 795 | int |
| 796 | m32c_force_relocation (fixS * fixp) |
| 797 | { |
| 798 | int reloc = fixp->fx_r_type; |
| 799 | |
| 800 | if (reloc > (int)BFD_RELOC_UNUSED) |
| 801 | { |
| 802 | reloc -= (int)BFD_RELOC_UNUSED; |
| 803 | switch (reloc) |
| 804 | { |
| 805 | case M32C_OPERAND_DSP_32_S16: |
| 806 | case M32C_OPERAND_DSP_32_U16: |
| 807 | case M32C_OPERAND_IMM_32_HI: |
| 808 | case M32C_OPERAND_DSP_16_S16: |
| 809 | case M32C_OPERAND_DSP_16_U16: |
| 810 | case M32C_OPERAND_IMM_16_HI: |
| 811 | case M32C_OPERAND_DSP_24_S16: |
| 812 | case M32C_OPERAND_DSP_24_U16: |
| 813 | case M32C_OPERAND_IMM_24_HI: |
| 814 | return 1; |
| 815 | } |
| 816 | } |
| 817 | else |
| 818 | { |
| 819 | if (fixp->fx_r_type == BFD_RELOC_16) |
| 820 | return 1; |
| 821 | } |
| 822 | |
| 823 | return generic_force_reloc (fixp); |
| 824 | } |
| 825 | \f |
| 826 | /* Write a value out to the object file, using the appropriate endianness. */ |
| 827 | |
| 828 | void |
| 829 | md_number_to_chars (char * buf, valueT val, int n) |
| 830 | { |
| 831 | number_to_chars_littleendian (buf, val, n); |
| 832 | } |
| 833 | |
| 834 | /* Turn a string in input_line_pointer into a floating point constant of type |
| 835 | type, and store the appropriate bytes in *litP. The number of LITTLENUMS |
| 836 | emitted is stored in *sizeP . An error message is returned, or NULL on OK. */ |
| 837 | |
| 838 | /* Equal to MAX_PRECISION in atof-ieee.c. */ |
| 839 | #define MAX_LITTLENUMS 6 |
| 840 | |
| 841 | char * |
| 842 | md_atof (int type, char * litP, int * sizeP) |
| 843 | { |
| 844 | int i; |
| 845 | int prec; |
| 846 | LITTLENUM_TYPE words [MAX_LITTLENUMS]; |
| 847 | char * t; |
| 848 | |
| 849 | switch (type) |
| 850 | { |
| 851 | case 'f': |
| 852 | case 'F': |
| 853 | case 's': |
| 854 | case 'S': |
| 855 | prec = 2; |
| 856 | break; |
| 857 | |
| 858 | case 'd': |
| 859 | case 'D': |
| 860 | case 'r': |
| 861 | case 'R': |
| 862 | prec = 4; |
| 863 | break; |
| 864 | |
| 865 | /* FIXME: Some targets allow other format chars for bigger sizes here. */ |
| 866 | |
| 867 | default: |
| 868 | * sizeP = 0; |
| 869 | return _("Bad call to md_atof()"); |
| 870 | } |
| 871 | |
| 872 | t = atof_ieee (input_line_pointer, type, words); |
| 873 | if (t) |
| 874 | input_line_pointer = t; |
| 875 | * sizeP = prec * sizeof (LITTLENUM_TYPE); |
| 876 | |
| 877 | for (i = 0; i < prec; i++) |
| 878 | { |
| 879 | md_number_to_chars (litP, (valueT) words[i], |
| 880 | sizeof (LITTLENUM_TYPE)); |
| 881 | litP += sizeof (LITTLENUM_TYPE); |
| 882 | } |
| 883 | |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | bfd_boolean |
| 888 | m32c_fix_adjustable (fixS * fixP) |
| 889 | { |
| 890 | int reloc; |
| 891 | if (fixP->fx_addsy == NULL) |
| 892 | return 1; |
| 893 | |
| 894 | /* We need the symbol name for the VTABLE entries. */ |
| 895 | reloc = fixP->fx_r_type; |
| 896 | if (reloc > (int)BFD_RELOC_UNUSED) |
| 897 | { |
| 898 | reloc -= (int)BFD_RELOC_UNUSED; |
| 899 | switch (reloc) |
| 900 | { |
| 901 | case M32C_OPERAND_DSP_32_S16: |
| 902 | case M32C_OPERAND_DSP_32_U16: |
| 903 | case M32C_OPERAND_IMM_32_HI: |
| 904 | case M32C_OPERAND_DSP_16_S16: |
| 905 | case M32C_OPERAND_DSP_16_U16: |
| 906 | case M32C_OPERAND_IMM_16_HI: |
| 907 | case M32C_OPERAND_DSP_24_S16: |
| 908 | case M32C_OPERAND_DSP_24_U16: |
| 909 | case M32C_OPERAND_IMM_24_HI: |
| 910 | return 0; |
| 911 | } |
| 912 | } |
| 913 | else |
| 914 | { |
| 915 | if (fixP->fx_r_type == BFD_RELOC_16) |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | /* Do not adjust relocations involving symbols in merged sections. |
| 920 | |
| 921 | A reloc patching in the value of some symbol S plus some addend A |
| 922 | can be produced in different ways: |
| 923 | |
| 924 | 1) It might simply be a reference to the data at S + A. Clearly, |
| 925 | if linker merging shift that data around, the value patched in |
| 926 | by the reloc needs to be adjusted accordingly. |
| 927 | |
| 928 | 2) Or, it might be a reference to S, with A added in as a constant |
| 929 | bias. For example, given code like this: |
| 930 | |
| 931 | static int S[100]; |
| 932 | |
| 933 | ... S[i - 8] ... |
| 934 | |
| 935 | it would be reasonable for the compiler to rearrange the array |
| 936 | reference to something like: |
| 937 | |
| 938 | ... (S-8)[i] ... |
| 939 | |
| 940 | and emit assembly code that refers to S - (8 * sizeof (int)), |
| 941 | so the subtraction is done entirely at compile-time. In this |
| 942 | case, the reloc's addend A would be -(8 * sizeof (int)), and |
| 943 | shifting around code or data at S + A should not affect the |
| 944 | reloc: the reloc isn't referring to that code or data at all. |
| 945 | |
| 946 | The linker has no way of knowing which case it has in hand. So, |
| 947 | to disambiguate, we have the linker always treat reloc addends as |
| 948 | in case 2): they're constants that should be simply added to the |
| 949 | symbol value, just like the reloc says. And we express case 1) |
| 950 | in different way: we have the compiler place a label at the real |
| 951 | target, and reference that label with an addend of zero. (The |
| 952 | compiler is unlikely to reference code using a label plus an |
| 953 | offset anyway, since it doesn't know the sizes of the |
| 954 | instructions.) |
| 955 | |
| 956 | The simplification being done by gas/write.c:adjust_reloc_syms, |
| 957 | however, turns the explicit-label usage into the label-plus- |
| 958 | offset usage, re-introducing the ambiguity the compiler avoided. |
| 959 | So we need to disable that simplification for symbols referring |
| 960 | to merged data. |
| 961 | |
| 962 | This only affects object size a little bit. */ |
| 963 | if (S_GET_SEGMENT (fixP->fx_addsy)->flags & SEC_MERGE) |
| 964 | return 0; |
| 965 | |
| 966 | return 1; |
| 967 | } |
| 968 | |
| 969 | /* Worker function for m32c_is_colon_insn(). */ |
| 970 | static char restore_colon PARAMS ((int)); |
| 971 | |
| 972 | static char |
| 973 | restore_colon (int advance_i_l_p_by) |
| 974 | { |
| 975 | char c; |
| 976 | |
| 977 | /* Restore the colon, and advance input_line_pointer to |
| 978 | the end of the new symbol. */ |
| 979 | * input_line_pointer = ':'; |
| 980 | input_line_pointer += advance_i_l_p_by; |
| 981 | c = * input_line_pointer; |
| 982 | * input_line_pointer = 0; |
| 983 | |
| 984 | return c; |
| 985 | } |
| 986 | |
| 987 | /* Determines if the symbol starting at START and ending in |
| 988 | a colon that was at the location pointed to by INPUT_LINE_POINTER |
| 989 | (but which has now been replaced bu a NUL) is in fact an |
| 990 | :Z, :S, :Q, or :G suffix. |
| 991 | If it is, then it restores the colon, advances INPUT_LINE_POINTER |
| 992 | to the real end of the instruction/symbol, and returns the character |
| 993 | that really terminated the symbol. Otherwise it returns 0. */ |
| 994 | char |
| 995 | m32c_is_colon_insn (char *start ATTRIBUTE_UNUSED) |
| 996 | { |
| 997 | char * i_l_p = input_line_pointer; |
| 998 | |
| 999 | /* Check to see if the text following the colon is 'G' */ |
| 1000 | if (TOLOWER (i_l_p[1]) == 'g' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) |
| 1001 | return restore_colon (2); |
| 1002 | |
| 1003 | /* Check to see if the text following the colon is 'Q' */ |
| 1004 | if (TOLOWER (i_l_p[1]) == 'q' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) |
| 1005 | return restore_colon (2); |
| 1006 | |
| 1007 | /* Check to see if the text following the colon is 'S' */ |
| 1008 | if (TOLOWER (i_l_p[1]) == 's' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) |
| 1009 | return restore_colon (2); |
| 1010 | |
| 1011 | /* Check to see if the text following the colon is 'Z' */ |
| 1012 | if (TOLOWER (i_l_p[1]) == 'z' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) |
| 1013 | return restore_colon (2); |
| 1014 | |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |