| 1 | /* tc-mt.c -- Assembler for the Morpho Technologies mt . |
| 2 | Copyright (C) 2005-2015 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, 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "as.h" |
| 22 | #include "dwarf2dbg.h" |
| 23 | #include "subsegs.h" |
| 24 | #include "symcat.h" |
| 25 | #include "opcodes/mt-desc.h" |
| 26 | #include "opcodes/mt-opc.h" |
| 27 | #include "cgen.h" |
| 28 | #include "elf/common.h" |
| 29 | #include "elf/mt.h" |
| 30 | #include "libbfd.h" |
| 31 | |
| 32 | /* Structure to hold all of the different components |
| 33 | describing an individual instruction. */ |
| 34 | typedef struct |
| 35 | { |
| 36 | const CGEN_INSN * insn; |
| 37 | const CGEN_INSN * orig_insn; |
| 38 | CGEN_FIELDS fields; |
| 39 | #if CGEN_INT_INSN_P |
| 40 | CGEN_INSN_INT buffer [1]; |
| 41 | #define INSN_VALUE(buf) (*(buf)) |
| 42 | #else |
| 43 | unsigned char buffer [CGEN_MAX_INSN_SIZE]; |
| 44 | #define INSN_VALUE(buf) (buf) |
| 45 | #endif |
| 46 | char * addr; |
| 47 | fragS * frag; |
| 48 | int num_fixups; |
| 49 | fixS * fixups [GAS_CGEN_MAX_FIXUPS]; |
| 50 | int indices [MAX_OPERAND_INSTANCES]; |
| 51 | } |
| 52 | mt_insn; |
| 53 | |
| 54 | |
| 55 | const char comment_chars[] = ";"; |
| 56 | const char line_comment_chars[] = "#"; |
| 57 | const char line_separator_chars[] = ""; |
| 58 | const char EXP_CHARS[] = "eE"; |
| 59 | const char FLT_CHARS[] = "dD"; |
| 60 | |
| 61 | /* The target specific pseudo-ops which we support. */ |
| 62 | const pseudo_typeS md_pseudo_table[] = |
| 63 | { |
| 64 | { "word", cons, 4 }, |
| 65 | { NULL, NULL, 0 } |
| 66 | }; |
| 67 | |
| 68 | \f |
| 69 | |
| 70 | static int no_scheduling_restrictions = 0; |
| 71 | |
| 72 | struct option md_longopts[] = |
| 73 | { |
| 74 | #define OPTION_NO_SCHED_REST (OPTION_MD_BASE) |
| 75 | { "nosched", no_argument, NULL, OPTION_NO_SCHED_REST }, |
| 76 | #define OPTION_MARCH (OPTION_MD_BASE + 1) |
| 77 | { "march", required_argument, NULL, OPTION_MARCH}, |
| 78 | { NULL, no_argument, NULL, 0 }, |
| 79 | }; |
| 80 | size_t md_longopts_size = sizeof (md_longopts); |
| 81 | |
| 82 | const char * md_shortopts = ""; |
| 83 | |
| 84 | /* Mach selected from command line. */ |
| 85 | static int mt_mach = bfd_mach_ms1; |
| 86 | static unsigned mt_mach_bitmask = 1 << MACH_MS1; |
| 87 | |
| 88 | /* Flags to set in the elf header */ |
| 89 | static flagword mt_flags = EF_MT_CPU_MRISC; |
| 90 | |
| 91 | /* The architecture to use. */ |
| 92 | enum mt_architectures |
| 93 | { |
| 94 | ms1_64_001, |
| 95 | ms1_16_002, |
| 96 | ms1_16_003, |
| 97 | ms2 |
| 98 | }; |
| 99 | |
| 100 | /* MT architecture we are using for this output file. */ |
| 101 | static enum mt_architectures mt_arch = ms1_16_002; |
| 102 | |
| 103 | int |
| 104 | md_parse_option (int c ATTRIBUTE_UNUSED, char * arg) |
| 105 | { |
| 106 | switch (c) |
| 107 | { |
| 108 | case OPTION_MARCH: |
| 109 | if (strcmp (arg, "ms1-64-001") == 0) |
| 110 | { |
| 111 | mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MRISC; |
| 112 | mt_mach = bfd_mach_ms1; |
| 113 | mt_mach_bitmask = 1 << MACH_MS1; |
| 114 | mt_arch = ms1_64_001; |
| 115 | } |
| 116 | else if (strcmp (arg, "ms1-16-002") == 0) |
| 117 | { |
| 118 | mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MRISC; |
| 119 | mt_mach = bfd_mach_ms1; |
| 120 | mt_mach_bitmask = 1 << MACH_MS1; |
| 121 | mt_arch = ms1_16_002; |
| 122 | } |
| 123 | else if (strcmp (arg, "ms1-16-003") == 0) |
| 124 | { |
| 125 | mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MRISC2; |
| 126 | mt_mach = bfd_mach_mrisc2; |
| 127 | mt_mach_bitmask = 1 << MACH_MS1_003; |
| 128 | mt_arch = ms1_16_003; |
| 129 | } |
| 130 | else if (strcmp (arg, "ms2") == 0) |
| 131 | { |
| 132 | mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MS2; |
| 133 | mt_mach = bfd_mach_mrisc2; |
| 134 | mt_mach_bitmask = 1 << MACH_MS2; |
| 135 | mt_arch = ms2; |
| 136 | } |
| 137 | case OPTION_NO_SCHED_REST: |
| 138 | no_scheduling_restrictions = 1; |
| 139 | break; |
| 140 | default: |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | return 1; |
| 145 | } |
| 146 | |
| 147 | |
| 148 | void |
| 149 | md_show_usage (FILE * stream) |
| 150 | { |
| 151 | fprintf (stream, _("MT specific command line options:\n")); |
| 152 | fprintf (stream, _(" -march=ms1-64-001 allow ms1-64-001 instructions\n")); |
| 153 | fprintf (stream, _(" -march=ms1-16-002 allow ms1-16-002 instructions (default)\n")); |
| 154 | fprintf (stream, _(" -march=ms1-16-003 allow ms1-16-003 instructions\n")); |
| 155 | fprintf (stream, _(" -march=ms2 allow ms2 instructions \n")); |
| 156 | fprintf (stream, _(" -nosched disable scheduling restrictions\n")); |
| 157 | } |
| 158 | |
| 159 | \f |
| 160 | void |
| 161 | md_begin (void) |
| 162 | { |
| 163 | /* Initialize the `cgen' interface. */ |
| 164 | |
| 165 | /* Set the machine number and endian. */ |
| 166 | gas_cgen_cpu_desc = mt_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, mt_mach_bitmask, |
| 167 | CGEN_CPU_OPEN_ENDIAN, |
| 168 | CGEN_ENDIAN_BIG, |
| 169 | CGEN_CPU_OPEN_END); |
| 170 | mt_cgen_init_asm (gas_cgen_cpu_desc); |
| 171 | |
| 172 | /* This is a callback from cgen to gas to parse operands. */ |
| 173 | cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); |
| 174 | |
| 175 | /* Set the ELF flags if desired. */ |
| 176 | if (mt_flags) |
| 177 | bfd_set_private_flags (stdoutput, mt_flags); |
| 178 | |
| 179 | /* Set the machine type. */ |
| 180 | bfd_default_set_arch_mach (stdoutput, bfd_arch_mt, mt_mach); |
| 181 | } |
| 182 | |
| 183 | void |
| 184 | md_assemble (char * str) |
| 185 | { |
| 186 | static long delayed_load_register = 0; |
| 187 | static long prev_delayed_load_register = 0; |
| 188 | static int last_insn_had_delay_slot = 0; |
| 189 | static int last_insn_in_noncond_delay_slot = 0; |
| 190 | static int last_insn_has_load_delay = 0; |
| 191 | static int last_insn_was_memory_access = 0; |
| 192 | static int last_insn_was_io_insn = 0; |
| 193 | static int last_insn_was_arithmetic_or_logic = 0; |
| 194 | static int last_insn_was_branch_insn = 0; |
| 195 | static int last_insn_was_conditional_branch_insn = 0; |
| 196 | |
| 197 | mt_insn insn; |
| 198 | char * errmsg; |
| 199 | |
| 200 | /* Initialize GAS's cgen interface for a new instruction. */ |
| 201 | gas_cgen_init_parse (); |
| 202 | |
| 203 | insn.insn = mt_cgen_assemble_insn |
| 204 | (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); |
| 205 | |
| 206 | if (!insn.insn) |
| 207 | { |
| 208 | as_bad ("%s", errmsg); |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | /* Doesn't really matter what we pass for RELAX_P here. */ |
| 213 | gas_cgen_finish_insn (insn.insn, insn.buffer, |
| 214 | CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); |
| 215 | |
| 216 | |
| 217 | /* Handle Scheduling Restrictions. */ |
| 218 | if (!no_scheduling_restrictions) |
| 219 | { |
| 220 | /* Detect consecutive Memory Accesses. */ |
| 221 | if (last_insn_was_memory_access |
| 222 | && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MEMORY_ACCESS) |
| 223 | && mt_mach == ms1_64_001) |
| 224 | as_warn (_("instruction %s may not follow another memory access instruction."), |
| 225 | CGEN_INSN_NAME (insn.insn)); |
| 226 | |
| 227 | /* Detect consecutive I/O Instructions. */ |
| 228 | else if (last_insn_was_io_insn |
| 229 | && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_IO_INSN)) |
| 230 | as_warn (_("instruction %s may not follow another I/O instruction."), |
| 231 | CGEN_INSN_NAME (insn.insn)); |
| 232 | |
| 233 | /* Detect consecutive branch instructions. */ |
| 234 | else if (last_insn_was_branch_insn |
| 235 | && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN)) |
| 236 | as_warn (_("%s may not occupy the delay slot of another branch insn."), |
| 237 | CGEN_INSN_NAME (insn.insn)); |
| 238 | |
| 239 | /* Detect data dependencies on delayed loads: memory and input insns. */ |
| 240 | if (last_insn_has_load_delay && delayed_load_register) |
| 241 | { |
| 242 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1) |
| 243 | && insn.fields.f_sr1 == delayed_load_register) |
| 244 | as_warn (_("operand references R%ld of previous load."), |
| 245 | insn.fields.f_sr1); |
| 246 | |
| 247 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2) |
| 248 | && insn.fields.f_sr2 == delayed_load_register) |
| 249 | as_warn (_("operand references R%ld of previous load."), |
| 250 | insn.fields.f_sr2); |
| 251 | } |
| 252 | |
| 253 | /* Detect JAL/RETI hazard */ |
| 254 | if (mt_mach == ms2 |
| 255 | && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_JAL_HAZARD)) |
| 256 | { |
| 257 | if ((CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1) |
| 258 | && insn.fields.f_sr1 == delayed_load_register) |
| 259 | || (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2) |
| 260 | && insn.fields.f_sr2 == delayed_load_register)) |
| 261 | as_warn (_("operand references R%ld of previous instruction."), |
| 262 | delayed_load_register); |
| 263 | else if ((CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1) |
| 264 | && insn.fields.f_sr1 == prev_delayed_load_register) |
| 265 | || (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2) |
| 266 | && insn.fields.f_sr2 == prev_delayed_load_register)) |
| 267 | as_warn (_("operand references R%ld of instruction before previous."), |
| 268 | prev_delayed_load_register); |
| 269 | } |
| 270 | |
| 271 | /* Detect data dependency between conditional branch instruction |
| 272 | and an immediately preceding arithmetic or logical instruction. */ |
| 273 | if (last_insn_was_arithmetic_or_logic |
| 274 | && !last_insn_in_noncond_delay_slot |
| 275 | && (delayed_load_register != 0) |
| 276 | && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN) |
| 277 | && mt_arch == ms1_64_001) |
| 278 | { |
| 279 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1) |
| 280 | && insn.fields.f_sr1 == delayed_load_register) |
| 281 | as_warn (_("conditional branch or jal insn's operand references R%ld of previous arithmetic or logic insn."), |
| 282 | insn.fields.f_sr1); |
| 283 | |
| 284 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2) |
| 285 | && insn.fields.f_sr2 == delayed_load_register) |
| 286 | as_warn (_("conditional branch or jal insn's operand references R%ld of previous arithmetic or logic insn."), |
| 287 | insn.fields.f_sr2); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | /* Keep track of details of this insn for processing next insn. */ |
| 292 | last_insn_in_noncond_delay_slot = last_insn_was_branch_insn |
| 293 | && !last_insn_was_conditional_branch_insn; |
| 294 | |
| 295 | last_insn_had_delay_slot = |
| 296 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT); |
| 297 | (void) last_insn_had_delay_slot; |
| 298 | |
| 299 | last_insn_has_load_delay = |
| 300 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_LOAD_DELAY); |
| 301 | |
| 302 | last_insn_was_memory_access = |
| 303 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MEMORY_ACCESS); |
| 304 | |
| 305 | last_insn_was_io_insn = |
| 306 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_IO_INSN); |
| 307 | |
| 308 | last_insn_was_arithmetic_or_logic = |
| 309 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_AL_INSN); |
| 310 | |
| 311 | last_insn_was_branch_insn = |
| 312 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN); |
| 313 | |
| 314 | last_insn_was_conditional_branch_insn = |
| 315 | CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN) |
| 316 | && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2); |
| 317 | |
| 318 | prev_delayed_load_register = delayed_load_register; |
| 319 | |
| 320 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRDR)) |
| 321 | delayed_load_register = insn.fields.f_dr; |
| 322 | else if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRDRRR)) |
| 323 | delayed_load_register = insn.fields.f_drrr; |
| 324 | else /* Insns has no destination register. */ |
| 325 | delayed_load_register = 0; |
| 326 | |
| 327 | /* Generate dwarf2 line numbers. */ |
| 328 | dwarf2_emit_insn (4); |
| 329 | } |
| 330 | |
| 331 | valueT |
| 332 | md_section_align (segT segment, valueT size) |
| 333 | { |
| 334 | int align = bfd_get_section_alignment (stdoutput, segment); |
| 335 | |
| 336 | return ((size + (1 << align) - 1) & (-1 << align)); |
| 337 | } |
| 338 | |
| 339 | symbolS * |
| 340 | md_undefined_symbol (char * name ATTRIBUTE_UNUSED) |
| 341 | { |
| 342 | return NULL; |
| 343 | } |
| 344 | \f |
| 345 | int |
| 346 | md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, |
| 347 | segT segment ATTRIBUTE_UNUSED) |
| 348 | { |
| 349 | as_fatal (_("md_estimate_size_before_relax\n")); |
| 350 | return 1; |
| 351 | } |
| 352 | |
| 353 | /* *fragP has been relaxed to its final size, and now needs to have |
| 354 | the bytes inside it modified to conform to the new size. |
| 355 | |
| 356 | Called after relaxation is finished. |
| 357 | fragP->fr_type == rs_machine_dependent. |
| 358 | fragP->fr_subtype is the subtype of what the address relaxed to. */ |
| 359 | |
| 360 | void |
| 361 | md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED, |
| 362 | segT sec ATTRIBUTE_UNUSED, |
| 363 | fragS * fragP ATTRIBUTE_UNUSED) |
| 364 | { |
| 365 | } |
| 366 | |
| 367 | \f |
| 368 | /* Functions concerning relocs. */ |
| 369 | |
| 370 | long |
| 371 | md_pcrel_from_section (fixS *fixP, segT sec) |
| 372 | { |
| 373 | if (fixP->fx_addsy != (symbolS *) NULL |
| 374 | && (!S_IS_DEFINED (fixP->fx_addsy) |
| 375 | || S_GET_SEGMENT (fixP->fx_addsy) != sec)) |
| 376 | /* The symbol is undefined (or is defined but not in this section). |
| 377 | Let the linker figure it out. */ |
| 378 | return 0; |
| 379 | |
| 380 | /* Return the address of the opcode - cgen adjusts for opcode size |
| 381 | itself, to be consistent with the disassembler, which must do |
| 382 | so. */ |
| 383 | return fixP->fx_where + fixP->fx_frag->fr_address; |
| 384 | } |
| 385 | |
| 386 | |
| 387 | /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. |
| 388 | Returns BFD_RELOC_NONE if no reloc type can be found. |
| 389 | *FIXP may be modified if desired. */ |
| 390 | |
| 391 | bfd_reloc_code_real_type |
| 392 | md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED, |
| 393 | const CGEN_OPERAND * operand, |
| 394 | fixS * fixP ATTRIBUTE_UNUSED) |
| 395 | { |
| 396 | bfd_reloc_code_real_type result; |
| 397 | |
| 398 | result = BFD_RELOC_NONE; |
| 399 | |
| 400 | switch (operand->type) |
| 401 | { |
| 402 | case MT_OPERAND_IMM16O: |
| 403 | result = BFD_RELOC_16_PCREL; |
| 404 | fixP->fx_pcrel = 1; |
| 405 | /* fixP->fx_no_overflow = 1; */ |
| 406 | break; |
| 407 | case MT_OPERAND_IMM16: |
| 408 | case MT_OPERAND_IMM16Z: |
| 409 | /* These may have been processed at parse time. */ |
| 410 | if (fixP->fx_cgen.opinfo != 0) |
| 411 | result = fixP->fx_cgen.opinfo; |
| 412 | fixP->fx_no_overflow = 1; |
| 413 | break; |
| 414 | case MT_OPERAND_LOOPSIZE: |
| 415 | result = BFD_RELOC_MT_PCINSN8; |
| 416 | fixP->fx_pcrel = 1; |
| 417 | /* Adjust for the delay slot, which is not part of the loop */ |
| 418 | fixP->fx_offset -= 8; |
| 419 | break; |
| 420 | default: |
| 421 | result = BFD_RELOC_NONE; |
| 422 | break; |
| 423 | } |
| 424 | |
| 425 | return result; |
| 426 | } |
| 427 | |
| 428 | /* Write a value out to the object file, using the appropriate endianness. */ |
| 429 | |
| 430 | void |
| 431 | md_number_to_chars (char * buf, valueT val, int n) |
| 432 | { |
| 433 | number_to_chars_bigendian (buf, val, n); |
| 434 | } |
| 435 | |
| 436 | char * |
| 437 | md_atof (int type, char * litP, int * sizeP) |
| 438 | { |
| 439 | return ieee_md_atof (type, litP, sizeP, FALSE); |
| 440 | } |
| 441 | |
| 442 | /* See whether we need to force a relocation into the output file. */ |
| 443 | |
| 444 | int |
| 445 | mt_force_relocation (fixS * fixp ATTRIBUTE_UNUSED) |
| 446 | { |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | void |
| 451 | mt_apply_fix (fixS *fixP, valueT *valueP, segT seg) |
| 452 | { |
| 453 | if ((fixP->fx_pcrel != 0) && (fixP->fx_r_type == BFD_RELOC_32)) |
| 454 | fixP->fx_r_type = BFD_RELOC_32_PCREL; |
| 455 | |
| 456 | gas_cgen_md_apply_fix (fixP, valueP, seg); |
| 457 | } |
| 458 | |
| 459 | bfd_boolean |
| 460 | mt_fix_adjustable (fixS * fixP) |
| 461 | { |
| 462 | if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) |
| 463 | { |
| 464 | const CGEN_INSN *insn = NULL; |
| 465 | int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; |
| 466 | const CGEN_OPERAND *operand; |
| 467 | |
| 468 | operand = cgen_operand_lookup_by_num(gas_cgen_cpu_desc, opindex); |
| 469 | md_cgen_lookup_reloc (insn, operand, fixP); |
| 470 | } |
| 471 | |
| 472 | if (fixP->fx_addsy == NULL) |
| 473 | return TRUE; |
| 474 | |
| 475 | /* Prevent all adjustments to global symbols. */ |
| 476 | if (S_IS_EXTERNAL (fixP->fx_addsy)) |
| 477 | return FALSE; |
| 478 | |
| 479 | if (S_IS_WEAK (fixP->fx_addsy)) |
| 480 | return FALSE; |
| 481 | |
| 482 | return 1; |
| 483 | } |