| 1 | /* tc-ip2k.c -- Assembler for the Scenix IP2xxx. |
| 2 | Copyright (C) 2000, 2002, 2003, 2005, 2006, 2007 |
| 3 | Free Software Foundation. Inc. |
| 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 3, 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, 51 Franklin Street - Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "as.h" |
| 23 | #include "subsegs.h" |
| 24 | #include "symcat.h" |
| 25 | #include "opcodes/ip2k-desc.h" |
| 26 | #include "opcodes/ip2k-opc.h" |
| 27 | #include "cgen.h" |
| 28 | #include "elf/common.h" |
| 29 | #include "elf/ip2k.h" |
| 30 | #include "libbfd.h" |
| 31 | |
| 32 | /* Structure to hold all of the different components describing |
| 33 | 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 | ip2k_insn; |
| 53 | |
| 54 | const char comment_chars[] = ";"; |
| 55 | const char line_comment_chars[] = "#"; |
| 56 | const char line_separator_chars[] = ""; |
| 57 | const char EXP_CHARS[] = "eE"; |
| 58 | const char FLT_CHARS[] = "dD"; |
| 59 | |
| 60 | /* Flag to detect when switching to code section where insn alignment is |
| 61 | implied. */ |
| 62 | static int force_code_align = 0; |
| 63 | |
| 64 | /* Mach selected from command line. */ |
| 65 | static int ip2k_mach = 0; |
| 66 | static unsigned ip2k_mach_bitmask = 0; |
| 67 | |
| 68 | |
| 69 | static void |
| 70 | ip2k_elf_section_rtn (int i) |
| 71 | { |
| 72 | obj_elf_section(i); |
| 73 | |
| 74 | if (force_code_align) |
| 75 | { |
| 76 | /* The s_align_ptwo function expects that we are just after a .align |
| 77 | directive and it will either try and read the align value or stop |
| 78 | if end of line so we must fake it out so it thinks we are at the |
| 79 | end of the line. */ |
| 80 | char *old_input_line_pointer = input_line_pointer; |
| 81 | input_line_pointer = "\n"; |
| 82 | s_align_ptwo (1); |
| 83 | force_code_align = 0; |
| 84 | /* Restore. */ |
| 85 | input_line_pointer = old_input_line_pointer; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | static void |
| 90 | ip2k_elf_section_text (int i) |
| 91 | { |
| 92 | char *old_input_line_pointer; |
| 93 | obj_elf_text(i); |
| 94 | |
| 95 | /* the s_align_ptwo function expects that we are just after a .align |
| 96 | directive and it will either try and read the align value or stop if |
| 97 | end of line so we must fake it out so it thinks we are at the end of |
| 98 | the line. */ |
| 99 | old_input_line_pointer = input_line_pointer; |
| 100 | input_line_pointer = "\n"; |
| 101 | s_align_ptwo (1); |
| 102 | force_code_align = 0; |
| 103 | /* Restore. */ |
| 104 | input_line_pointer = old_input_line_pointer; |
| 105 | } |
| 106 | |
| 107 | /* The target specific pseudo-ops which we support. */ |
| 108 | const pseudo_typeS md_pseudo_table[] = |
| 109 | { |
| 110 | { "text", ip2k_elf_section_text, 0 }, |
| 111 | { "sect", ip2k_elf_section_rtn, 0 }, |
| 112 | { NULL, NULL, 0 } |
| 113 | }; |
| 114 | |
| 115 | \f |
| 116 | |
| 117 | enum options |
| 118 | { |
| 119 | OPTION_CPU_IP2022 = OPTION_MD_BASE, |
| 120 | OPTION_CPU_IP2022EXT |
| 121 | }; |
| 122 | |
| 123 | struct option md_longopts[] = |
| 124 | { |
| 125 | { "mip2022", no_argument, NULL, OPTION_CPU_IP2022 }, |
| 126 | { "mip2022ext", no_argument, NULL, OPTION_CPU_IP2022EXT }, |
| 127 | { NULL, no_argument, NULL, 0 }, |
| 128 | }; |
| 129 | size_t md_longopts_size = sizeof (md_longopts); |
| 130 | |
| 131 | const char * md_shortopts = ""; |
| 132 | |
| 133 | int |
| 134 | md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED) |
| 135 | { |
| 136 | switch (c) |
| 137 | { |
| 138 | case OPTION_CPU_IP2022: |
| 139 | ip2k_mach = bfd_mach_ip2022; |
| 140 | ip2k_mach_bitmask = 1 << MACH_IP2022; |
| 141 | break; |
| 142 | |
| 143 | case OPTION_CPU_IP2022EXT: |
| 144 | ip2k_mach = bfd_mach_ip2022ext; |
| 145 | ip2k_mach_bitmask = 1 << MACH_IP2022EXT; |
| 146 | break; |
| 147 | |
| 148 | default: |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | return 1; |
| 153 | } |
| 154 | |
| 155 | void |
| 156 | md_show_usage (FILE * stream) |
| 157 | { |
| 158 | fprintf (stream, _("IP2K specific command line options:\n")); |
| 159 | fprintf (stream, _(" -mip2022 restrict to IP2022 insns \n")); |
| 160 | fprintf (stream, _(" -mip2022ext permit extended IP2022 insn\n")); |
| 161 | } |
| 162 | |
| 163 | \f |
| 164 | void |
| 165 | md_begin (void) |
| 166 | { |
| 167 | /* Initialize the `cgen' interface. */ |
| 168 | |
| 169 | /* Set the machine number and endian. */ |
| 170 | gas_cgen_cpu_desc = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, |
| 171 | ip2k_mach_bitmask, |
| 172 | CGEN_CPU_OPEN_ENDIAN, |
| 173 | CGEN_ENDIAN_BIG, |
| 174 | CGEN_CPU_OPEN_END); |
| 175 | ip2k_cgen_init_asm (gas_cgen_cpu_desc); |
| 176 | |
| 177 | /* This is a callback from cgen to gas to parse operands. */ |
| 178 | cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); |
| 179 | |
| 180 | /* Set the machine type. */ |
| 181 | bfd_default_set_arch_mach (stdoutput, bfd_arch_ip2k, ip2k_mach); |
| 182 | } |
| 183 | |
| 184 | |
| 185 | void |
| 186 | md_assemble (char * str) |
| 187 | { |
| 188 | ip2k_insn insn; |
| 189 | char * errmsg; |
| 190 | |
| 191 | /* Initialize GAS's cgen interface for a new instruction. */ |
| 192 | gas_cgen_init_parse (); |
| 193 | |
| 194 | insn.insn = ip2k_cgen_assemble_insn |
| 195 | (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); |
| 196 | |
| 197 | if (!insn.insn) |
| 198 | { |
| 199 | as_bad ("%s", errmsg); |
| 200 | return; |
| 201 | } |
| 202 | |
| 203 | /* Check for special relocation required by SKIP instructions. */ |
| 204 | if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SKIPA)) |
| 205 | /* Unconditional skip has a 1-bit relocation of the current pc, so |
| 206 | that we emit either sb pcl.0 or snb pcl.0 depending on whether |
| 207 | the PCL (pc + 2) >> 1 is odd or even. */ |
| 208 | { |
| 209 | enum cgen_parse_operand_result result_type; |
| 210 | bfd_vma value; |
| 211 | const char *curpc_plus_2 = ".+2"; |
| 212 | const char *err; |
| 213 | |
| 214 | err = cgen_parse_address (gas_cgen_cpu_desc, & curpc_plus_2, |
| 215 | IP2K_OPERAND_ADDR16CJP, |
| 216 | BFD_RELOC_IP2K_PC_SKIP, |
| 217 | & result_type, & value); |
| 218 | if (err) |
| 219 | { |
| 220 | as_bad ("%s", err); |
| 221 | return; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | /* Doesn't really matter what we pass for RELAX_P here. */ |
| 226 | gas_cgen_finish_insn (insn.insn, insn.buffer, |
| 227 | CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); |
| 228 | } |
| 229 | |
| 230 | valueT |
| 231 | md_section_align (segT segment, valueT size) |
| 232 | { |
| 233 | int align = bfd_get_section_alignment (stdoutput, segment); |
| 234 | |
| 235 | return ((size + (1 << align) - 1) & (-1 << align)); |
| 236 | } |
| 237 | |
| 238 | |
| 239 | symbolS * |
| 240 | md_undefined_symbol (char * name ATTRIBUTE_UNUSED) |
| 241 | { |
| 242 | return 0; |
| 243 | } |
| 244 | \f |
| 245 | int |
| 246 | md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, |
| 247 | segT segment ATTRIBUTE_UNUSED) |
| 248 | { |
| 249 | as_fatal (_("md_estimate_size_before_relax\n")); |
| 250 | return 1; |
| 251 | } |
| 252 | |
| 253 | |
| 254 | /* *fragP has been relaxed to its final size, and now needs to have |
| 255 | the bytes inside it modified to conform to the new size. |
| 256 | |
| 257 | Called after relaxation is finished. |
| 258 | fragP->fr_type == rs_machine_dependent. |
| 259 | fragP->fr_subtype is the subtype of what the address relaxed to. */ |
| 260 | |
| 261 | void |
| 262 | md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED, |
| 263 | segT sec ATTRIBUTE_UNUSED, |
| 264 | fragS * fragP ATTRIBUTE_UNUSED) |
| 265 | { |
| 266 | } |
| 267 | |
| 268 | \f |
| 269 | /* Functions concerning relocs. */ |
| 270 | |
| 271 | long |
| 272 | md_pcrel_from (fixS *fixP) |
| 273 | { |
| 274 | as_fatal (_("md_pcrel_from\n")); |
| 275 | |
| 276 | /* Return the address of the delay slot. */ |
| 277 | return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address; |
| 278 | } |
| 279 | |
| 280 | |
| 281 | /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. |
| 282 | Returns BFD_RELOC_NONE if no reloc type can be found. |
| 283 | *FIXP may be modified if desired. */ |
| 284 | |
| 285 | bfd_reloc_code_real_type |
| 286 | md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED, |
| 287 | const CGEN_OPERAND * operand, |
| 288 | fixS * fixP ATTRIBUTE_UNUSED) |
| 289 | { |
| 290 | bfd_reloc_code_real_type result; |
| 291 | |
| 292 | result = BFD_RELOC_NONE; |
| 293 | |
| 294 | switch (operand->type) |
| 295 | { |
| 296 | case IP2K_OPERAND_FR: |
| 297 | case IP2K_OPERAND_ADDR16L: |
| 298 | case IP2K_OPERAND_ADDR16H: |
| 299 | case IP2K_OPERAND_LIT8: |
| 300 | /* These may have been processed at parse time. */ |
| 301 | if (fixP->fx_cgen.opinfo != 0) |
| 302 | result = fixP->fx_cgen.opinfo; |
| 303 | fixP->fx_no_overflow = 1; |
| 304 | break; |
| 305 | |
| 306 | case IP2K_OPERAND_ADDR16CJP: |
| 307 | result = fixP->fx_cgen.opinfo; |
| 308 | if (result == 0 || result == BFD_RELOC_NONE) |
| 309 | result = BFD_RELOC_IP2K_ADDR16CJP; |
| 310 | fixP->fx_no_overflow = 1; |
| 311 | break; |
| 312 | |
| 313 | case IP2K_OPERAND_ADDR16P: |
| 314 | result = BFD_RELOC_IP2K_PAGE3; |
| 315 | fixP->fx_no_overflow = 1; |
| 316 | break; |
| 317 | |
| 318 | default: |
| 319 | result = BFD_RELOC_NONE; |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | return result; |
| 324 | } |
| 325 | |
| 326 | |
| 327 | /* Write a value out to the object file, using the appropriate endianness. */ |
| 328 | |
| 329 | void |
| 330 | md_number_to_chars (char * buf, valueT val, int n) |
| 331 | { |
| 332 | number_to_chars_bigendian (buf, val, n); |
| 333 | } |
| 334 | |
| 335 | /* Turn a string in input_line_pointer into a floating point constant of type |
| 336 | type, and store the appropriate bytes in *litP. The number of LITTLENUMS |
| 337 | emitted is stored in *sizeP . An error message is returned, or NULL on |
| 338 | OK. */ |
| 339 | |
| 340 | /* Equal to MAX_PRECISION in atof-ieee.c */ |
| 341 | #define MAX_LITTLENUMS 6 |
| 342 | |
| 343 | char * |
| 344 | md_atof (int type, char * litP, int * sizeP) |
| 345 | { |
| 346 | int prec; |
| 347 | LITTLENUM_TYPE words [MAX_LITTLENUMS]; |
| 348 | LITTLENUM_TYPE *wordP; |
| 349 | char * t; |
| 350 | |
| 351 | switch (type) |
| 352 | { |
| 353 | case 'f': |
| 354 | case 'F': |
| 355 | case 's': |
| 356 | case 'S': |
| 357 | prec = 2; |
| 358 | break; |
| 359 | |
| 360 | case 'd': |
| 361 | case 'D': |
| 362 | case 'r': |
| 363 | case 'R': |
| 364 | prec = 4; |
| 365 | break; |
| 366 | |
| 367 | /* FIXME: Some targets allow other format chars for bigger sizes here. */ |
| 368 | |
| 369 | default: |
| 370 | * sizeP = 0; |
| 371 | return _("Bad call to md_atof()"); |
| 372 | } |
| 373 | |
| 374 | t = atof_ieee (input_line_pointer, type, words); |
| 375 | if (t) |
| 376 | input_line_pointer = t; |
| 377 | * sizeP = prec * sizeof (LITTLENUM_TYPE); |
| 378 | |
| 379 | /* This loops outputs the LITTLENUMs in REVERSE order; in accord with |
| 380 | the ip2k endianness. */ |
| 381 | for (wordP = words; prec--;) |
| 382 | { |
| 383 | md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE)); |
| 384 | litP += sizeof (LITTLENUM_TYPE); |
| 385 | } |
| 386 | |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | |
| 391 | /* See whether we need to force a relocation into the output file. |
| 392 | Force most of them, since the linker's bfd relocation engine |
| 393 | understands range limits better than gas' cgen fixup engine. |
| 394 | Consider the case of a fixup intermediate value being larger than |
| 395 | the instruction it will be eventually encoded within. */ |
| 396 | |
| 397 | int |
| 398 | ip2k_force_relocation (fixS * fix) |
| 399 | { |
| 400 | switch (fix->fx_r_type) |
| 401 | { |
| 402 | case BFD_RELOC_IP2K_FR9: |
| 403 | case BFD_RELOC_IP2K_FR_OFFSET: |
| 404 | case BFD_RELOC_IP2K_BANK: |
| 405 | case BFD_RELOC_IP2K_ADDR16CJP: |
| 406 | case BFD_RELOC_IP2K_PAGE3: |
| 407 | case BFD_RELOC_IP2K_LO8DATA: |
| 408 | case BFD_RELOC_IP2K_HI8DATA: |
| 409 | case BFD_RELOC_IP2K_EX8DATA: |
| 410 | case BFD_RELOC_IP2K_LO8INSN: |
| 411 | case BFD_RELOC_IP2K_HI8INSN: |
| 412 | case BFD_RELOC_IP2K_PC_SKIP: |
| 413 | case BFD_RELOC_IP2K_TEXT: |
| 414 | return 1; |
| 415 | |
| 416 | case BFD_RELOC_16: |
| 417 | if (fix->fx_subsy && S_IS_DEFINED (fix->fx_subsy) |
| 418 | && fix->fx_addsy && S_IS_DEFINED (fix->fx_addsy) |
| 419 | && (S_GET_SEGMENT (fix->fx_addsy)->flags & SEC_CODE)) |
| 420 | { |
| 421 | fix->fx_r_type = BFD_RELOC_IP2K_TEXT; |
| 422 | return 0; |
| 423 | } |
| 424 | break; |
| 425 | |
| 426 | default: |
| 427 | break; |
| 428 | } |
| 429 | |
| 430 | return generic_force_reloc (fix); |
| 431 | } |
| 432 | |
| 433 | void |
| 434 | ip2k_apply_fix (fixS *fixP, valueT *valueP, segT seg) |
| 435 | { |
| 436 | if (fixP->fx_r_type == BFD_RELOC_IP2K_TEXT |
| 437 | && ! fixP->fx_addsy |
| 438 | && ! fixP->fx_subsy) |
| 439 | { |
| 440 | *valueP = ((int)(* valueP)) / 2; |
| 441 | fixP->fx_r_type = BFD_RELOC_16; |
| 442 | } |
| 443 | else if (fixP->fx_r_type == BFD_RELOC_UNUSED + IP2K_OPERAND_FR) |
| 444 | { |
| 445 | /* Must be careful when we are fixing up an FR. We could be |
| 446 | fixing up an offset to (SP) or (DP) in which case we don't |
| 447 | want to step on the top 2 bits of the FR operand. The |
| 448 | gas_cgen_md_apply_fix doesn't know any better and overwrites |
| 449 | the entire operand. We counter this by adding the bits |
| 450 | to the new value. */ |
| 451 | char *where = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 452 | |
| 453 | /* Canonical name, since used a lot. */ |
| 454 | CGEN_CPU_DESC cd = gas_cgen_cpu_desc; |
| 455 | CGEN_INSN_INT insn_value |
| 456 | = cgen_get_insn_value (cd, (unsigned char *) where, |
| 457 | CGEN_INSN_BITSIZE (fixP->fx_cgen.insn)); |
| 458 | /* Preserve (DP) or (SP) specification. */ |
| 459 | *valueP += (insn_value & 0x180); |
| 460 | } |
| 461 | |
| 462 | gas_cgen_md_apply_fix (fixP, valueP, seg); |
| 463 | } |
| 464 | |
| 465 | int |
| 466 | ip2k_elf_section_flags (int flags, |
| 467 | int attr ATTRIBUTE_UNUSED, |
| 468 | int type ATTRIBUTE_UNUSED) |
| 469 | { |
| 470 | /* This is used to detect when the section changes to an executable section. |
| 471 | This function is called by the elf section processing. When we note an |
| 472 | executable section specifier we set an internal flag to denote when |
| 473 | word alignment should be forced. */ |
| 474 | if (flags & SEC_CODE) |
| 475 | force_code_align = 1; |
| 476 | |
| 477 | return flags; |
| 478 | } |
| 479 | |