| 1 | /* tc-vax.c - vax-specific - |
| 2 | Copyright 1987, 1991, 1992, 1993, 1994, 1995, 1998, 2000, 2001, 2002, |
| 3 | 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 21 | 02110-1301, USA. */ |
| 22 | |
| 23 | #include "as.h" |
| 24 | |
| 25 | #include "vax-inst.h" |
| 26 | #include "obstack.h" /* For FRAG_APPEND_1_CHAR macro in "frags.h" */ |
| 27 | #include "subsegs.h" |
| 28 | #include "safe-ctype.h" |
| 29 | |
| 30 | #ifdef OBJ_ELF |
| 31 | #include "elf/vax.h" |
| 32 | #endif |
| 33 | |
| 34 | /* These chars start a comment anywhere in a source file (except inside |
| 35 | another comment */ |
| 36 | const char comment_chars[] = "#"; |
| 37 | |
| 38 | /* These chars only start a comment at the beginning of a line. */ |
| 39 | /* Note that for the VAX the are the same as comment_chars above. */ |
| 40 | const char line_comment_chars[] = "#"; |
| 41 | |
| 42 | const char line_separator_chars[] = ";"; |
| 43 | |
| 44 | /* Chars that can be used to separate mant from exp in floating point nums. */ |
| 45 | const char EXP_CHARS[] = "eE"; |
| 46 | |
| 47 | /* Chars that mean this number is a floating point constant |
| 48 | as in 0f123.456 |
| 49 | or 0H1.234E-12 (see exp chars above). */ |
| 50 | const char FLT_CHARS[] = "dDfFgGhH"; |
| 51 | |
| 52 | /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be |
| 53 | changed in read.c . Ideally it shouldn't have to know about it at all, |
| 54 | but nothing is ideal around here. */ |
| 55 | |
| 56 | /* Hold details of an operand expression. */ |
| 57 | static expressionS exp_of_operand[VIT_MAX_OPERANDS]; |
| 58 | static segT seg_of_operand[VIT_MAX_OPERANDS]; |
| 59 | |
| 60 | /* A vax instruction after decoding. */ |
| 61 | static struct vit v; |
| 62 | |
| 63 | /* Hold details of big operands. */ |
| 64 | LITTLENUM_TYPE big_operand_bits[VIT_MAX_OPERANDS][SIZE_OF_LARGE_NUMBER]; |
| 65 | FLONUM_TYPE float_operand[VIT_MAX_OPERANDS]; |
| 66 | /* Above is made to point into big_operand_bits by md_begin(). */ |
| 67 | |
| 68 | #ifdef OBJ_ELF |
| 69 | #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" |
| 70 | #define PROCEDURE_LINKAGE_TABLE_NAME "_PROCEDURE_LINKAGE_TABLE_" |
| 71 | symbolS *GOT_symbol; /* Pre-defined "_GLOBAL_OFFSET_TABLE_". */ |
| 72 | symbolS *PLT_symbol; /* Pre-defined "_PROCEDURE_LINKAGE_TABLE_". */ |
| 73 | #endif |
| 74 | |
| 75 | int flag_hash_long_names; /* -+ */ |
| 76 | int flag_one; /* -1 */ |
| 77 | int flag_show_after_trunc; /* -H */ |
| 78 | int flag_no_hash_mixed_case; /* -h NUM */ |
| 79 | #ifdef OBJ_ELF |
| 80 | int flag_want_pic; /* -k */ |
| 81 | #endif |
| 82 | \f |
| 83 | /* For VAX, relative addresses of "just the right length" are easy. |
| 84 | The branch displacement is always the last operand, even in |
| 85 | synthetic instructions. |
| 86 | For VAX, we encode the relax_substateTs (in e.g. fr_substate) as: |
| 87 | |
| 88 | 4 3 2 1 0 bit number |
| 89 | ---/ /--+-------+-------+-------+-------+-------+ |
| 90 | | what state ? | how long ? | |
| 91 | ---/ /--+-------+-------+-------+-------+-------+ |
| 92 | |
| 93 | The "how long" bits are 00=byte, 01=word, 10=long. |
| 94 | This is a Un*x convention. |
| 95 | Not all lengths are legit for a given value of (what state). |
| 96 | The "how long" refers merely to the displacement length. |
| 97 | The address usually has some constant bytes in it as well. |
| 98 | |
| 99 | groups for VAX address relaxing. |
| 100 | |
| 101 | 1. "foo" pc-relative. |
| 102 | length of byte, word, long |
| 103 | |
| 104 | 2a. J<cond> where <cond> is a simple flag test. |
| 105 | length of byte, word, long. |
| 106 | VAX opcodes are: (Hex) |
| 107 | bneq/bnequ 12 |
| 108 | beql/beqlu 13 |
| 109 | bgtr 14 |
| 110 | bleq 15 |
| 111 | bgeq 18 |
| 112 | blss 19 |
| 113 | bgtru 1a |
| 114 | blequ 1b |
| 115 | bvc 1c |
| 116 | bvs 1d |
| 117 | bgequ/bcc 1e |
| 118 | blssu/bcs 1f |
| 119 | Always, you complement 0th bit to reverse condition. |
| 120 | Always, 1-byte opcode, then 1-byte displacement. |
| 121 | |
| 122 | 2b. J<cond> where cond tests a memory bit. |
| 123 | length of byte, word, long. |
| 124 | Vax opcodes are: (Hex) |
| 125 | bbs e0 |
| 126 | bbc e1 |
| 127 | bbss e2 |
| 128 | bbcs e3 |
| 129 | bbsc e4 |
| 130 | bbcc e5 |
| 131 | Always, you complement 0th bit to reverse condition. |
| 132 | Always, 1-byte opcde, longword-address, byte-address, 1-byte-displacement |
| 133 | |
| 134 | 2c. J<cond> where cond tests low-order memory bit |
| 135 | length of byte,word,long. |
| 136 | Vax opcodes are: (Hex) |
| 137 | blbs e8 |
| 138 | blbc e9 |
| 139 | Always, you complement 0th bit to reverse condition. |
| 140 | Always, 1-byte opcode, longword-address, 1-byte displacement. |
| 141 | |
| 142 | 3. Jbs/Jbr. |
| 143 | length of byte,word,long. |
| 144 | Vax opcodes are: (Hex) |
| 145 | bsbb 10 |
| 146 | brb 11 |
| 147 | These are like (2) but there is no condition to reverse. |
| 148 | Always, 1 byte opcode, then displacement/absolute. |
| 149 | |
| 150 | 4a. JacbX |
| 151 | length of word, long. |
| 152 | Vax opcodes are: (Hex) |
| 153 | acbw 3d |
| 154 | acbf 4f |
| 155 | acbd 6f |
| 156 | abcb 9d |
| 157 | acbl f1 |
| 158 | acbg 4ffd |
| 159 | acbh 6ffd |
| 160 | Always, we cannot reverse the sense of the branch; we have a word |
| 161 | displacement. |
| 162 | The double-byte op-codes don't hurt: we never want to modify the |
| 163 | opcode, so we don't care how many bytes are between the opcode and |
| 164 | the operand. |
| 165 | |
| 166 | 4b. JXobXXX |
| 167 | length of long, long, byte. |
| 168 | Vax opcodes are: (Hex) |
| 169 | aoblss f2 |
| 170 | aobleq f3 |
| 171 | sobgeq f4 |
| 172 | sobgtr f5 |
| 173 | Always, we cannot reverse the sense of the branch; we have a byte |
| 174 | displacement. |
| 175 | |
| 176 | The only time we need to modify the opcode is for class 2 instructions. |
| 177 | After relax() we may complement the lowest order bit of such instruction |
| 178 | to reverse sense of branch. |
| 179 | |
| 180 | For class 2 instructions, we store context of "where is the opcode literal". |
| 181 | We can change an opcode's lowest order bit without breaking anything else. |
| 182 | |
| 183 | We sometimes store context in the operand literal. This way we can figure out |
| 184 | after relax() what the original addressing mode was. */ |
| 185 | \f |
| 186 | /* These displacements are relative to the start address of the |
| 187 | displacement. The first letter is Byte, Word. 2nd letter is |
| 188 | Forward, Backward. */ |
| 189 | #define BF (1+ 127) |
| 190 | #define BB (1+-128) |
| 191 | #define WF (2+ 32767) |
| 192 | #define WB (2+-32768) |
| 193 | /* Dont need LF, LB because they always reach. [They are coded as 0.] */ |
| 194 | |
| 195 | #define C(a,b) ENCODE_RELAX(a,b) |
| 196 | /* This macro has no side-effects. */ |
| 197 | #define ENCODE_RELAX(what,length) (((what) << 2) + (length)) |
| 198 | #define RELAX_STATE(s) ((s) >> 2) |
| 199 | #define RELAX_LENGTH(s) ((s) & 3) |
| 200 | |
| 201 | const relax_typeS md_relax_table[] = |
| 202 | { |
| 203 | {1, 1, 0, 0}, /* error sentinel 0,0 */ |
| 204 | {1, 1, 0, 0}, /* unused 0,1 */ |
| 205 | {1, 1, 0, 0}, /* unused 0,2 */ |
| 206 | {1, 1, 0, 0}, /* unused 0,3 */ |
| 207 | |
| 208 | {BF + 1, BB + 1, 2, C (1, 1)},/* B^"foo" 1,0 */ |
| 209 | {WF + 1, WB + 1, 3, C (1, 2)},/* W^"foo" 1,1 */ |
| 210 | {0, 0, 5, 0}, /* L^"foo" 1,2 */ |
| 211 | {1, 1, 0, 0}, /* unused 1,3 */ |
| 212 | |
| 213 | {BF, BB, 1, C (2, 1)}, /* b<cond> B^"foo" 2,0 */ |
| 214 | {WF + 2, WB + 2, 4, C (2, 2)},/* br.+? brw X 2,1 */ |
| 215 | {0, 0, 7, 0}, /* br.+? jmp X 2,2 */ |
| 216 | {1, 1, 0, 0}, /* unused 2,3 */ |
| 217 | |
| 218 | {BF, BB, 1, C (3, 1)}, /* brb B^foo 3,0 */ |
| 219 | {WF, WB, 2, C (3, 2)}, /* brw W^foo 3,1 */ |
| 220 | {0, 0, 5, 0}, /* Jmp L^foo 3,2 */ |
| 221 | {1, 1, 0, 0}, /* unused 3,3 */ |
| 222 | |
| 223 | {1, 1, 0, 0}, /* unused 4,0 */ |
| 224 | {WF, WB, 2, C (4, 2)}, /* acb_ ^Wfoo 4,1 */ |
| 225 | {0, 0, 10, 0}, /* acb_,br,jmp L^foo4,2 */ |
| 226 | {1, 1, 0, 0}, /* unused 4,3 */ |
| 227 | |
| 228 | {BF, BB, 1, C (5, 1)}, /* Xob___,,foo 5,0 */ |
| 229 | {WF + 4, WB + 4, 6, C (5, 2)},/* Xob.+2,brb.+3,brw5,1 */ |
| 230 | {0, 0, 9, 0}, /* Xob.+2,brb.+6,jmp5,2 */ |
| 231 | {1, 1, 0, 0}, /* unused 5,3 */ |
| 232 | }; |
| 233 | |
| 234 | #undef C |
| 235 | #undef BF |
| 236 | #undef BB |
| 237 | #undef WF |
| 238 | #undef WB |
| 239 | |
| 240 | void float_cons (int); |
| 241 | int flonum_gen2vax (char, FLONUM_TYPE *, LITTLENUM_TYPE *); |
| 242 | |
| 243 | const pseudo_typeS md_pseudo_table[] = |
| 244 | { |
| 245 | {"dfloat", float_cons, 'd'}, |
| 246 | {"ffloat", float_cons, 'f'}, |
| 247 | {"gfloat", float_cons, 'g'}, |
| 248 | {"hfloat", float_cons, 'h'}, |
| 249 | {"d_floating", float_cons, 'd'}, |
| 250 | {"f_floating", float_cons, 'f'}, |
| 251 | {"g_floating", float_cons, 'g'}, |
| 252 | {"h_floating", float_cons, 'h'}, |
| 253 | {NULL, NULL, 0}, |
| 254 | }; |
| 255 | |
| 256 | #define STATE_PC_RELATIVE (1) |
| 257 | #define STATE_CONDITIONAL_BRANCH (2) |
| 258 | #define STATE_ALWAYS_BRANCH (3) /* includes BSB... */ |
| 259 | #define STATE_COMPLEX_BRANCH (4) |
| 260 | #define STATE_COMPLEX_HOP (5) |
| 261 | |
| 262 | #define STATE_BYTE (0) |
| 263 | #define STATE_WORD (1) |
| 264 | #define STATE_LONG (2) |
| 265 | #define STATE_UNDF (3) /* Symbol undefined in pass1. */ |
| 266 | |
| 267 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
| 268 | \f |
| 269 | void |
| 270 | md_number_to_chars (char con[], valueT value, int nbytes) |
| 271 | { |
| 272 | number_to_chars_littleendian (con, value, nbytes); |
| 273 | } |
| 274 | |
| 275 | /* Fix up some data or instructions after we find out the value of a symbol |
| 276 | that they reference. */ |
| 277 | |
| 278 | void /* Knows about order of bytes in address. */ |
| 279 | md_apply_fix (fixS *fixP, valueT *valueP, segT seg ATTRIBUTE_UNUSED) |
| 280 | { |
| 281 | valueT value = * valueP; |
| 282 | |
| 283 | if (((fixP->fx_addsy == NULL && fixP->fx_subsy == NULL) |
| 284 | && fixP->fx_r_type != BFD_RELOC_32_PLT_PCREL |
| 285 | && fixP->fx_r_type != BFD_RELOC_32_GOT_PCREL) |
| 286 | || fixP->fx_r_type == NO_RELOC) |
| 287 | number_to_chars_littleendian (fixP->fx_where + fixP->fx_frag->fr_literal, |
| 288 | value, fixP->fx_size); |
| 289 | |
| 290 | if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0) |
| 291 | fixP->fx_done = 1; |
| 292 | } |
| 293 | |
| 294 | /* Convert a number from VAX byte order (little endian) |
| 295 | into host byte order. |
| 296 | con is the buffer to convert, |
| 297 | nbytes is the length of the given buffer. */ |
| 298 | static long |
| 299 | md_chars_to_number (unsigned char con[], int nbytes) |
| 300 | { |
| 301 | long retval; |
| 302 | |
| 303 | for (retval = 0, con += nbytes - 1; nbytes--; con--) |
| 304 | { |
| 305 | retval <<= BITS_PER_CHAR; |
| 306 | retval |= *con; |
| 307 | } |
| 308 | return retval; |
| 309 | } |
| 310 | |
| 311 | /* Copy a bignum from in to out. |
| 312 | If the output is shorter than the input, copy lower-order |
| 313 | littlenums. Return 0 or the number of significant littlenums |
| 314 | dropped. Assumes littlenum arrays are densely packed: no unused |
| 315 | chars between the littlenums. Uses memcpy() to move littlenums, and |
| 316 | wants to know length (in chars) of the input bignum. */ |
| 317 | |
| 318 | static int |
| 319 | bignum_copy (LITTLENUM_TYPE *in, |
| 320 | int in_length, /* in sizeof(littlenum)s */ |
| 321 | LITTLENUM_TYPE *out, |
| 322 | int out_length /* in sizeof(littlenum)s */) |
| 323 | { |
| 324 | int significant_littlenums_dropped; |
| 325 | |
| 326 | if (out_length < in_length) |
| 327 | { |
| 328 | LITTLENUM_TYPE *p; /* -> most significant (non-zero) input |
| 329 | littlenum. */ |
| 330 | |
| 331 | memcpy ((void *) out, (void *) in, |
| 332 | (unsigned int) out_length << LITTLENUM_SHIFT); |
| 333 | for (p = in + in_length - 1; p >= in; --p) |
| 334 | { |
| 335 | if (*p) |
| 336 | break; |
| 337 | } |
| 338 | significant_littlenums_dropped = p - in - in_length + 1; |
| 339 | |
| 340 | if (significant_littlenums_dropped < 0) |
| 341 | significant_littlenums_dropped = 0; |
| 342 | } |
| 343 | else |
| 344 | { |
| 345 | memcpy ((char *) out, (char *) in, |
| 346 | (unsigned int) in_length << LITTLENUM_SHIFT); |
| 347 | |
| 348 | if (out_length > in_length) |
| 349 | memset ((char *) (out + in_length), '\0', |
| 350 | (unsigned int) (out_length - in_length) << LITTLENUM_SHIFT); |
| 351 | |
| 352 | significant_littlenums_dropped = 0; |
| 353 | } |
| 354 | |
| 355 | return significant_littlenums_dropped; |
| 356 | } |
| 357 | \f |
| 358 | /* md_estimate_size_before_relax(), called just before relax(). |
| 359 | Any symbol that is now undefined will not become defined. |
| 360 | Return the correct fr_subtype in the frag and the growth beyond |
| 361 | fr_fix. */ |
| 362 | int |
| 363 | md_estimate_size_before_relax (fragS *fragP, segT segment) |
| 364 | { |
| 365 | if (RELAX_LENGTH (fragP->fr_subtype) == STATE_UNDF) |
| 366 | { |
| 367 | if (S_GET_SEGMENT (fragP->fr_symbol) != segment |
| 368 | #ifdef OBJ_ELF |
| 369 | || S_IS_WEAK (fragP->fr_symbol) |
| 370 | || S_IS_EXTERNAL (fragP->fr_symbol) |
| 371 | #endif |
| 372 | ) |
| 373 | { |
| 374 | /* Non-relaxable cases. */ |
| 375 | int reloc_type = NO_RELOC; |
| 376 | char *p; |
| 377 | int old_fr_fix; |
| 378 | |
| 379 | old_fr_fix = fragP->fr_fix; |
| 380 | p = fragP->fr_literal + old_fr_fix; |
| 381 | #ifdef OBJ_ELF |
| 382 | /* If this is to an undefined symbol, then if it's an indirect |
| 383 | reference indicate that is can mutated into a GLOB_DAT or |
| 384 | JUMP_SLOT by the loader. We restrict ourselves to no offset |
| 385 | due to a limitation in the NetBSD linker. */ |
| 386 | |
| 387 | if (GOT_symbol == NULL) |
| 388 | GOT_symbol = symbol_find (GLOBAL_OFFSET_TABLE_NAME); |
| 389 | if (PLT_symbol == NULL) |
| 390 | PLT_symbol = symbol_find (PROCEDURE_LINKAGE_TABLE_NAME); |
| 391 | if ((GOT_symbol == NULL || fragP->fr_symbol != GOT_symbol) |
| 392 | && (PLT_symbol == NULL || fragP->fr_symbol != PLT_symbol) |
| 393 | && fragP->fr_symbol != NULL |
| 394 | && flag_want_pic |
| 395 | && (!S_IS_DEFINED (fragP->fr_symbol) |
| 396 | || S_IS_WEAK (fragP->fr_symbol) |
| 397 | || S_IS_EXTERNAL (fragP->fr_symbol))) |
| 398 | { |
| 399 | /* Indirect references cannot go through the GOT or PLT, |
| 400 | let's hope they'll become local in the final link. */ |
| 401 | if ((ELF_ST_VISIBILITY (S_GET_OTHER (fragP->fr_symbol)) |
| 402 | != STV_DEFAULT) |
| 403 | || (p[0] & 0x10)) |
| 404 | reloc_type = BFD_RELOC_32_PCREL; |
| 405 | else if (((unsigned char *) fragP->fr_opcode)[0] == VAX_CALLS |
| 406 | || ((unsigned char *) fragP->fr_opcode)[0] == VAX_CALLG |
| 407 | || ((unsigned char *) fragP->fr_opcode)[0] == VAX_JSB |
| 408 | || ((unsigned char *) fragP->fr_opcode)[0] == VAX_JMP |
| 409 | || S_IS_FUNCTION (fragP->fr_symbol)) |
| 410 | reloc_type = BFD_RELOC_32_PLT_PCREL; |
| 411 | else |
| 412 | reloc_type = BFD_RELOC_32_GOT_PCREL; |
| 413 | } |
| 414 | #endif |
| 415 | switch (RELAX_STATE (fragP->fr_subtype)) |
| 416 | { |
| 417 | case STATE_PC_RELATIVE: |
| 418 | p[0] |= VAX_PC_RELATIVE_MODE; /* Preserve @ bit. */ |
| 419 | fragP->fr_fix += 1 + 4; |
| 420 | fix_new (fragP, old_fr_fix + 1, 4, fragP->fr_symbol, |
| 421 | fragP->fr_offset, 1, reloc_type); |
| 422 | break; |
| 423 | |
| 424 | case STATE_CONDITIONAL_BRANCH: |
| 425 | *fragP->fr_opcode ^= 1; /* Reverse sense of branch. */ |
| 426 | p[0] = 6; |
| 427 | p[1] = VAX_JMP; |
| 428 | p[2] = VAX_PC_RELATIVE_MODE; /* ...(PC) */ |
| 429 | fragP->fr_fix += 1 + 1 + 1 + 4; |
| 430 | fix_new (fragP, old_fr_fix + 3, 4, fragP->fr_symbol, |
| 431 | fragP->fr_offset, 1, NO_RELOC); |
| 432 | break; |
| 433 | |
| 434 | case STATE_COMPLEX_BRANCH: |
| 435 | p[0] = 2; |
| 436 | p[1] = 0; |
| 437 | p[2] = VAX_BRB; |
| 438 | p[3] = 6; |
| 439 | p[4] = VAX_JMP; |
| 440 | p[5] = VAX_PC_RELATIVE_MODE; /* ...(pc) */ |
| 441 | fragP->fr_fix += 2 + 2 + 1 + 1 + 4; |
| 442 | fix_new (fragP, old_fr_fix + 6, 4, fragP->fr_symbol, |
| 443 | fragP->fr_offset, 1, NO_RELOC); |
| 444 | break; |
| 445 | |
| 446 | case STATE_COMPLEX_HOP: |
| 447 | p[0] = 2; |
| 448 | p[1] = VAX_BRB; |
| 449 | p[2] = 6; |
| 450 | p[3] = VAX_JMP; |
| 451 | p[4] = VAX_PC_RELATIVE_MODE; /* ...(pc) */ |
| 452 | fragP->fr_fix += 1 + 2 + 1 + 1 + 4; |
| 453 | fix_new (fragP, old_fr_fix + 5, 4, fragP->fr_symbol, |
| 454 | fragP->fr_offset, 1, NO_RELOC); |
| 455 | break; |
| 456 | |
| 457 | case STATE_ALWAYS_BRANCH: |
| 458 | *fragP->fr_opcode += VAX_WIDEN_LONG; |
| 459 | p[0] = VAX_PC_RELATIVE_MODE; /* ...(PC) */ |
| 460 | fragP->fr_fix += 1 + 4; |
| 461 | fix_new (fragP, old_fr_fix + 1, 4, fragP->fr_symbol, |
| 462 | fragP->fr_offset, 1, NO_RELOC); |
| 463 | break; |
| 464 | |
| 465 | default: |
| 466 | abort (); |
| 467 | } |
| 468 | frag_wane (fragP); |
| 469 | |
| 470 | /* Return the growth in the fixed part of the frag. */ |
| 471 | return fragP->fr_fix - old_fr_fix; |
| 472 | } |
| 473 | |
| 474 | /* Relaxable cases. Set up the initial guess for the variable |
| 475 | part of the frag. */ |
| 476 | switch (RELAX_STATE (fragP->fr_subtype)) |
| 477 | { |
| 478 | case STATE_PC_RELATIVE: |
| 479 | fragP->fr_subtype = ENCODE_RELAX (STATE_PC_RELATIVE, STATE_BYTE); |
| 480 | break; |
| 481 | case STATE_CONDITIONAL_BRANCH: |
| 482 | fragP->fr_subtype = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE); |
| 483 | break; |
| 484 | case STATE_COMPLEX_BRANCH: |
| 485 | fragP->fr_subtype = ENCODE_RELAX (STATE_COMPLEX_BRANCH, STATE_WORD); |
| 486 | break; |
| 487 | case STATE_COMPLEX_HOP: |
| 488 | fragP->fr_subtype = ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_BYTE); |
| 489 | break; |
| 490 | case STATE_ALWAYS_BRANCH: |
| 491 | fragP->fr_subtype = ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_BYTE); |
| 492 | break; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | if (fragP->fr_subtype >= sizeof (md_relax_table) / sizeof (md_relax_table[0])) |
| 497 | abort (); |
| 498 | |
| 499 | /* Return the size of the variable part of the frag. */ |
| 500 | return md_relax_table[fragP->fr_subtype].rlx_length; |
| 501 | } |
| 502 | \f |
| 503 | /* Called after relax() is finished. |
| 504 | In: Address of frag. |
| 505 | fr_type == rs_machine_dependent. |
| 506 | fr_subtype is what the address relaxed to. |
| 507 | |
| 508 | Out: Any fixSs and constants are set up. |
| 509 | Caller will turn frag into a ".space 0". */ |
| 510 | void |
| 511 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, |
| 512 | segT seg ATTRIBUTE_UNUSED, |
| 513 | fragS *fragP) |
| 514 | { |
| 515 | char *addressP; /* -> _var to change. */ |
| 516 | char *opcodeP; /* -> opcode char(s) to change. */ |
| 517 | short int extension = 0; /* Size of relaxed address. */ |
| 518 | /* Added to fr_fix: incl. ALL var chars. */ |
| 519 | symbolS *symbolP; |
| 520 | long where; |
| 521 | |
| 522 | know (fragP->fr_type == rs_machine_dependent); |
| 523 | where = fragP->fr_fix; |
| 524 | addressP = fragP->fr_literal + where; |
| 525 | opcodeP = fragP->fr_opcode; |
| 526 | symbolP = fragP->fr_symbol; |
| 527 | know (symbolP); |
| 528 | |
| 529 | switch (fragP->fr_subtype) |
| 530 | { |
| 531 | case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_BYTE): |
| 532 | know (*addressP == 0 || *addressP == 0x10); /* '@' bit. */ |
| 533 | addressP[0] |= 0xAF; /* Byte displacement. */ |
| 534 | fix_new (fragP, fragP->fr_fix + 1, 1, fragP->fr_symbol, |
| 535 | fragP->fr_offset, 1, NO_RELOC); |
| 536 | extension = 2; |
| 537 | break; |
| 538 | |
| 539 | case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_WORD): |
| 540 | know (*addressP == 0 || *addressP == 0x10); /* '@' bit. */ |
| 541 | addressP[0] |= 0xCF; /* Word displacement. */ |
| 542 | fix_new (fragP, fragP->fr_fix + 1, 2, fragP->fr_symbol, |
| 543 | fragP->fr_offset, 1, NO_RELOC); |
| 544 | extension = 3; |
| 545 | break; |
| 546 | |
| 547 | case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_LONG): |
| 548 | know (*addressP == 0 || *addressP == 0x10); /* '@' bit. */ |
| 549 | addressP[0] |= 0xEF; /* Long word displacement. */ |
| 550 | fix_new (fragP, fragP->fr_fix + 1, 4, fragP->fr_symbol, |
| 551 | fragP->fr_offset, 1, NO_RELOC); |
| 552 | extension = 5; |
| 553 | break; |
| 554 | |
| 555 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): |
| 556 | fix_new (fragP, fragP->fr_fix, 1, fragP->fr_symbol, |
| 557 | fragP->fr_offset, 1, NO_RELOC); |
| 558 | extension = 1; |
| 559 | break; |
| 560 | |
| 561 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): |
| 562 | opcodeP[0] ^= 1; /* Reverse sense of test. */ |
| 563 | addressP[0] = 3; |
| 564 | addressP[1] = VAX_BRW; |
| 565 | fix_new (fragP, fragP->fr_fix + 2, 2, fragP->fr_symbol, |
| 566 | fragP->fr_offset, 1, NO_RELOC); |
| 567 | extension = 4; |
| 568 | break; |
| 569 | |
| 570 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_LONG): |
| 571 | opcodeP[0] ^= 1; /* Reverse sense of test. */ |
| 572 | addressP[0] = 6; |
| 573 | addressP[1] = VAX_JMP; |
| 574 | addressP[2] = VAX_PC_RELATIVE_MODE; |
| 575 | fix_new (fragP, fragP->fr_fix + 3, 4, fragP->fr_symbol, |
| 576 | fragP->fr_offset, 1, NO_RELOC); |
| 577 | extension = 7; |
| 578 | break; |
| 579 | |
| 580 | case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_BYTE): |
| 581 | fix_new (fragP, fragP->fr_fix, 1, fragP->fr_symbol, |
| 582 | fragP->fr_offset, 1, NO_RELOC); |
| 583 | extension = 1; |
| 584 | break; |
| 585 | |
| 586 | case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_WORD): |
| 587 | opcodeP[0] += VAX_WIDEN_WORD; /* brb -> brw, bsbb -> bsbw */ |
| 588 | fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol, fragP->fr_offset, |
| 589 | 1, NO_RELOC); |
| 590 | extension = 2; |
| 591 | break; |
| 592 | |
| 593 | case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_LONG): |
| 594 | opcodeP[0] += VAX_WIDEN_LONG; /* brb -> jmp, bsbb -> jsb */ |
| 595 | addressP[0] = VAX_PC_RELATIVE_MODE; |
| 596 | fix_new (fragP, fragP->fr_fix + 1, 4, fragP->fr_symbol, |
| 597 | fragP->fr_offset, 1, NO_RELOC); |
| 598 | extension = 5; |
| 599 | break; |
| 600 | |
| 601 | case ENCODE_RELAX (STATE_COMPLEX_BRANCH, STATE_WORD): |
| 602 | fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol, |
| 603 | fragP->fr_offset, 1, NO_RELOC); |
| 604 | extension = 2; |
| 605 | break; |
| 606 | |
| 607 | case ENCODE_RELAX (STATE_COMPLEX_BRANCH, STATE_LONG): |
| 608 | addressP[0] = 2; |
| 609 | addressP[1] = 0; |
| 610 | addressP[2] = VAX_BRB; |
| 611 | addressP[3] = 6; |
| 612 | addressP[4] = VAX_JMP; |
| 613 | addressP[5] = VAX_PC_RELATIVE_MODE; |
| 614 | fix_new (fragP, fragP->fr_fix + 6, 4, fragP->fr_symbol, |
| 615 | fragP->fr_offset, 1, NO_RELOC); |
| 616 | extension = 10; |
| 617 | break; |
| 618 | |
| 619 | case ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_BYTE): |
| 620 | fix_new (fragP, fragP->fr_fix, 1, fragP->fr_symbol, |
| 621 | fragP->fr_offset, 1, NO_RELOC); |
| 622 | extension = 1; |
| 623 | break; |
| 624 | |
| 625 | case ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_WORD): |
| 626 | addressP[0] = 2; |
| 627 | addressP[1] = VAX_BRB; |
| 628 | addressP[2] = 3; |
| 629 | addressP[3] = VAX_BRW; |
| 630 | fix_new (fragP, fragP->fr_fix + 4, 2, fragP->fr_symbol, |
| 631 | fragP->fr_offset, 1, NO_RELOC); |
| 632 | extension = 6; |
| 633 | break; |
| 634 | |
| 635 | case ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_LONG): |
| 636 | addressP[0] = 2; |
| 637 | addressP[1] = VAX_BRB; |
| 638 | addressP[2] = 6; |
| 639 | addressP[3] = VAX_JMP; |
| 640 | addressP[4] = VAX_PC_RELATIVE_MODE; |
| 641 | fix_new (fragP, fragP->fr_fix + 5, 4, fragP->fr_symbol, |
| 642 | fragP->fr_offset, 1, NO_RELOC); |
| 643 | extension = 9; |
| 644 | break; |
| 645 | |
| 646 | default: |
| 647 | BAD_CASE (fragP->fr_subtype); |
| 648 | break; |
| 649 | } |
| 650 | fragP->fr_fix += extension; |
| 651 | } |
| 652 | |
| 653 | /* Translate internal format of relocation info into target format. |
| 654 | |
| 655 | On vax: first 4 bytes are normal unsigned long, next three bytes |
| 656 | are symbolnum, least sig. byte first. Last byte is broken up with |
| 657 | the upper nibble as nuthin, bit 3 as extern, bits 2 & 1 as length, and |
| 658 | bit 0 as pcrel. */ |
| 659 | #ifdef comment |
| 660 | void |
| 661 | md_ri_to_chars (char *the_bytes, struct reloc_info_generic ri) |
| 662 | { |
| 663 | /* This is easy. */ |
| 664 | md_number_to_chars (the_bytes, ri.r_address, sizeof (ri.r_address)); |
| 665 | /* Now the fun stuff. */ |
| 666 | the_bytes[6] = (ri.r_symbolnum >> 16) & 0x0ff; |
| 667 | the_bytes[5] = (ri.r_symbolnum >> 8) & 0x0ff; |
| 668 | the_bytes[4] = ri.r_symbolnum & 0x0ff; |
| 669 | the_bytes[7] = (((ri.r_extern << 3) & 0x08) | ((ri.r_length << 1) & 0x06) |
| 670 | | ((ri.r_pcrel << 0) & 0x01)) & 0x0F; |
| 671 | } |
| 672 | |
| 673 | #endif /* comment */ |
| 674 | |
| 675 | /* BUGS, GRIPES, APOLOGIA, etc. |
| 676 | |
| 677 | The opcode table 'votstrs' needs to be sorted on opcode frequency. |
| 678 | That is, AFTER we hash it with hash_...(), we want most-used opcodes |
| 679 | to come out of the hash table faster. |
| 680 | |
| 681 | I am sorry to inflict yet another VAX assembler on the world, but |
| 682 | RMS says we must do everything from scratch, to prevent pin-heads |
| 683 | restricting this software. |
| 684 | |
| 685 | This is a vaguely modular set of routines in C to parse VAX |
| 686 | assembly code using DEC mnemonics. It is NOT un*x specific. |
| 687 | |
| 688 | The idea here is that the assembler has taken care of all: |
| 689 | labels |
| 690 | macros |
| 691 | listing |
| 692 | pseudo-ops |
| 693 | line continuation |
| 694 | comments |
| 695 | condensing any whitespace down to exactly one space |
| 696 | and all we have to do is parse 1 line into a vax instruction |
| 697 | partially formed. We will accept a line, and deliver: |
| 698 | an error message (hopefully empty) |
| 699 | a skeleton VAX instruction (tree structure) |
| 700 | textual pointers to all the operand expressions |
| 701 | a warning message that notes a silly operand (hopefully empty) |
| 702 | |
| 703 | E D I T H I S T O R Y |
| 704 | |
| 705 | 17may86 Dean Elsner. Bug if line ends immediately after opcode. |
| 706 | 30apr86 Dean Elsner. New vip_op() uses arg block so change call. |
| 707 | 6jan86 Dean Elsner. Crock vip_begin() to call vip_op_defaults(). |
| 708 | 2jan86 Dean Elsner. Invent synthetic opcodes. |
| 709 | Widen vax_opcodeT to 32 bits. Use a bit for VIT_OPCODE_SYNTHETIC, |
| 710 | which means this is not a real opcode, it is like a macro; it will |
| 711 | be relax()ed into 1 or more instructions. |
| 712 | Use another bit for VIT_OPCODE_SPECIAL if the op-code is not optimised |
| 713 | like a regular branch instruction. Option added to vip_begin(): |
| 714 | exclude synthetic opcodes. Invent synthetic_votstrs[]. |
| 715 | 31dec85 Dean Elsner. Invent vit_opcode_nbytes. |
| 716 | Also make vit_opcode into a char[]. We now have n-byte vax opcodes, |
| 717 | so caller's don't have to know the difference between a 1-byte & a |
| 718 | 2-byte op-code. Still need vax_opcodeT concept, so we know how |
| 719 | big an object must be to hold an op.code. |
| 720 | 30dec85 Dean Elsner. Widen typedef vax_opcodeT in "vax-inst.h" |
| 721 | because vax opcodes may be 16 bits. Our crufty C compiler was |
| 722 | happily initialising 8-bit vot_codes with 16-bit numbers! |
| 723 | (Wouldn't the 'phone company like to compress data so easily!) |
| 724 | 29dec85 Dean Elsner. New static table vax_operand_width_size[]. |
| 725 | Invented so we know hw many bytes a "I^#42" needs in its immediate |
| 726 | operand. Revised struct vop in "vax-inst.h": explicitly include |
| 727 | byte length of each operand, and it's letter-code datum type. |
| 728 | 17nov85 Dean Elsner. Name Change. |
| 729 | Due to ar(1) truncating names, we learned the hard way that |
| 730 | "vax-inst-parse.c" -> "vax-inst-parse." dropping the "o" off |
| 731 | the archived object name. SO... we shortened the name of this |
| 732 | source file, and changed the makefile. */ |
| 733 | |
| 734 | /* Handle of the OPCODE hash table. */ |
| 735 | static struct hash_control *op_hash; |
| 736 | |
| 737 | /* In: 1 character, from "bdfghloqpw" being the data-type of an operand |
| 738 | of a vax instruction. |
| 739 | |
| 740 | Out: the length of an operand of that type, in bytes. |
| 741 | Special branch operands types "-?!" have length 0. */ |
| 742 | |
| 743 | static const short int vax_operand_width_size[256] = |
| 744 | { |
| 745 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 746 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 747 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 748 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 749 | 0, 0, 1, 0, 8, 0, 4, 8, 16, 0, 0, 0, 4, 0, 0,16, /* ..b.d.fgh...l..o */ |
| 750 | 0, 8, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, /* .q.....w........ */ |
| 751 | 0, 0, 1, 0, 8, 0, 4, 8, 16, 0, 0, 0, 4, 0, 0,16, /* ..b.d.fgh...l..o */ |
| 752 | 0, 8, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, /* .q.....w........ */ |
| 753 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 754 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 755 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 756 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 757 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 758 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 759 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 760 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 761 | }; |
| 762 | \f |
| 763 | /* This perversion encodes all the vax opcodes as a bunch of strings. |
| 764 | RMS says we should build our hash-table at run-time. Hmm. |
| 765 | Please would someone arrange these in decreasing frequency of opcode? |
| 766 | Because of the way hash_...() works, the most frequently used opcode |
| 767 | should be textually first and so on. |
| 768 | |
| 769 | Input for this table was 'vax.opcodes', awk(1)ed by 'vax.opcodes.c.awk' . |
| 770 | So change 'vax.opcodes', then re-generate this table. */ |
| 771 | |
| 772 | #include "opcode/vax.h" |
| 773 | \f |
| 774 | /* This is a table of optional op-codes. All of them represent |
| 775 | 'synthetic' instructions that seem popular. |
| 776 | |
| 777 | Here we make some pseudo op-codes. Every code has a bit set to say |
| 778 | it is synthetic. This lets you catch them if you want to |
| 779 | ban these opcodes. They are mnemonics for "elastic" instructions |
| 780 | that are supposed to assemble into the fewest bytes needed to do a |
| 781 | branch, or to do a conditional branch, or whatever. |
| 782 | |
| 783 | The opcode is in the usual place [low-order n*8 bits]. This means |
| 784 | that if you mask off the bucky bits, the usual rules apply about |
| 785 | how long the opcode is. |
| 786 | |
| 787 | All VAX branch displacements come at the end of the instruction. |
| 788 | For simple branches (1-byte opcode + 1-byte displacement) the last |
| 789 | operand is coded 'b?' where the "data type" '?' is a clue that we |
| 790 | may reverse the sense of the branch (complement lowest order bit) |
| 791 | and branch around a jump. This is by far the most common case. |
| 792 | That is why the VIT_OPCODE_SYNTHETIC bit is set: it says this is |
| 793 | a 0-byte op-code followed by 2 or more bytes of operand address. |
| 794 | |
| 795 | If the op-code has VIT_OPCODE_SPECIAL set, then we have a more unusual |
| 796 | case. |
| 797 | |
| 798 | For JBSB & JBR the treatment is the similar, except (1) we have a 'bw' |
| 799 | option before (2) we can directly JSB/JMP because there is no condition. |
| 800 | These operands have 'b-' as their access/data type. |
| 801 | |
| 802 | That leaves a bunch of random opcodes: JACBx, JxOBxxx. In these |
| 803 | cases, we do the same idea. JACBxxx are all marked with a 'b!' |
| 804 | JAOBxxx & JSOBxxx are marked with a 'b:'. */ |
| 805 | #if (VIT_OPCODE_SYNTHETIC != 0x80000000) |
| 806 | #error "You have just broken the encoding below, which assumes the sign bit means 'I am an imaginary instruction'." |
| 807 | #endif |
| 808 | |
| 809 | #if (VIT_OPCODE_SPECIAL != 0x40000000) |
| 810 | #error "You have just broken the encoding below, which assumes the 0x40 M bit means 'I am not to be "optimised" the way normal branches are'." |
| 811 | #endif |
| 812 | |
| 813 | static const struct vot |
| 814 | synthetic_votstrs[] = |
| 815 | { |
| 816 | {"jbsb", {"b-", 0xC0000010}}, /* BSD 4.2 */ |
| 817 | /* jsb used already */ |
| 818 | {"jbr", {"b-", 0xC0000011}}, /* BSD 4.2 */ |
| 819 | {"jr", {"b-", 0xC0000011}}, /* consistent */ |
| 820 | {"jneq", {"b?", 0x80000012}}, |
| 821 | {"jnequ", {"b?", 0x80000012}}, |
| 822 | {"jeql", {"b?", 0x80000013}}, |
| 823 | {"jeqlu", {"b?", 0x80000013}}, |
| 824 | {"jgtr", {"b?", 0x80000014}}, |
| 825 | {"jleq", {"b?", 0x80000015}}, |
| 826 | /* un-used opcodes here */ |
| 827 | {"jgeq", {"b?", 0x80000018}}, |
| 828 | {"jlss", {"b?", 0x80000019}}, |
| 829 | {"jgtru", {"b?", 0x8000001a}}, |
| 830 | {"jlequ", {"b?", 0x8000001b}}, |
| 831 | {"jvc", {"b?", 0x8000001c}}, |
| 832 | {"jvs", {"b?", 0x8000001d}}, |
| 833 | {"jgequ", {"b?", 0x8000001e}}, |
| 834 | {"jcc", {"b?", 0x8000001e}}, |
| 835 | {"jlssu", {"b?", 0x8000001f}}, |
| 836 | {"jcs", {"b?", 0x8000001f}}, |
| 837 | |
| 838 | {"jacbw", {"rwrwmwb!", 0xC000003d}}, |
| 839 | {"jacbf", {"rfrfmfb!", 0xC000004f}}, |
| 840 | {"jacbd", {"rdrdmdb!", 0xC000006f}}, |
| 841 | {"jacbb", {"rbrbmbb!", 0xC000009d}}, |
| 842 | {"jacbl", {"rlrlmlb!", 0xC00000f1}}, |
| 843 | {"jacbg", {"rgrgmgb!", 0xC0004ffd}}, |
| 844 | {"jacbh", {"rhrhmhb!", 0xC0006ffd}}, |
| 845 | |
| 846 | {"jbs", {"rlvbb?", 0x800000e0}}, |
| 847 | {"jbc", {"rlvbb?", 0x800000e1}}, |
| 848 | {"jbss", {"rlvbb?", 0x800000e2}}, |
| 849 | {"jbcs", {"rlvbb?", 0x800000e3}}, |
| 850 | {"jbsc", {"rlvbb?", 0x800000e4}}, |
| 851 | {"jbcc", {"rlvbb?", 0x800000e5}}, |
| 852 | {"jbssi", {"rlvbb?", 0x800000e6}}, |
| 853 | {"jbcci", {"rlvbb?", 0x800000e7}}, |
| 854 | {"jlbs", {"rlb?", 0x800000e8}}, |
| 855 | {"jlbc", {"rlb?", 0x800000e9}}, |
| 856 | |
| 857 | {"jaoblss", {"rlmlb:", 0xC00000f2}}, |
| 858 | {"jaobleq", {"rlmlb:", 0xC00000f3}}, |
| 859 | {"jsobgeq", {"mlb:", 0xC00000f4}}, |
| 860 | {"jsobgtr", {"mlb:", 0xC00000f5}}, |
| 861 | |
| 862 | /* CASEx has no branch addresses in our conception of it. */ |
| 863 | /* You should use ".word ..." statements after the "case ...". */ |
| 864 | |
| 865 | {"", {"", 0}} /* Empty is end sentinel. */ |
| 866 | }; |
| 867 | \f |
| 868 | /* Because this module is useful for both VMS and UN*X style assemblers |
| 869 | and because of the variety of UN*X assemblers we must recognise |
| 870 | the different conventions for assembler operand notation. For example |
| 871 | VMS says "#42" for immediate mode, while most UN*X say "$42". |
| 872 | We permit arbitrary sets of (single) characters to represent the |
| 873 | 3 concepts that DEC writes '#', '@', '^'. */ |
| 874 | |
| 875 | /* Character tests. */ |
| 876 | #define VIP_IMMEDIATE 01 /* Character is like DEC # */ |
| 877 | #define VIP_INDIRECT 02 /* Char is like DEC @ */ |
| 878 | #define VIP_DISPLEN 04 /* Char is like DEC ^ */ |
| 879 | |
| 880 | #define IMMEDIATEP(c) (vip_metacharacters [(c) & 0xff] & VIP_IMMEDIATE) |
| 881 | #define INDIRECTP(c) (vip_metacharacters [(c) & 0xff] & VIP_INDIRECT) |
| 882 | #define DISPLENP(c) (vip_metacharacters [(c) & 0xff] & VIP_DISPLEN) |
| 883 | |
| 884 | /* We assume 8 bits per byte. Use vip_op_defaults() to set these up BEFORE we |
| 885 | are ever called. */ |
| 886 | |
| 887 | #if defined(CONST_TABLE) |
| 888 | #define _ 0, |
| 889 | #define I VIP_IMMEDIATE, |
| 890 | #define S VIP_INDIRECT, |
| 891 | #define D VIP_DISPLEN, |
| 892 | static const char |
| 893 | vip_metacharacters[256] = |
| 894 | { |
| 895 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /* ^@ ^A ^B ^C ^D ^E ^F ^G ^H ^I ^J ^K ^L ^M ^N ^O*/ |
| 896 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /* ^P ^Q ^R ^S ^T ^U ^V ^W ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */ |
| 897 | _ _ _ _ I _ _ _ _ _ S _ _ _ _ _ /* sp ! " # $ % & ' ( ) * + , - . / */ |
| 898 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*0 1 2 3 4 5 6 7 8 9 : ; < = > ?*/ |
| 899 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*@ A B C D E F G H I J K L M N O*/ |
| 900 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*P Q R S T U V W X Y Z [ \ ] ^ _*/ |
| 901 | D _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*` a b c d e f g h i j k l m n o*/ |
| 902 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*p q r s t u v w x y z { | } ~ ^?*/ |
| 903 | |
| 904 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 905 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 906 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 907 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 908 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 909 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 910 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 911 | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| 912 | }; |
| 913 | #undef _ |
| 914 | #undef I |
| 915 | #undef S |
| 916 | #undef D |
| 917 | |
| 918 | #else |
| 919 | |
| 920 | static char vip_metacharacters[256]; |
| 921 | |
| 922 | static void |
| 923 | vip_op_1 (int bit, const char *syms) |
| 924 | { |
| 925 | unsigned char t; |
| 926 | |
| 927 | while ((t = *syms++) != 0) |
| 928 | vip_metacharacters[t] |= bit; |
| 929 | } |
| 930 | |
| 931 | /* Can be called any time. More arguments may appear in future. */ |
| 932 | static void |
| 933 | vip_op_defaults (const char *immediate, const char *indirect, const char *displen) |
| 934 | { |
| 935 | vip_op_1 (VIP_IMMEDIATE, immediate); |
| 936 | vip_op_1 (VIP_INDIRECT, indirect); |
| 937 | vip_op_1 (VIP_DISPLEN, displen); |
| 938 | } |
| 939 | |
| 940 | #endif |
| 941 | |
| 942 | /* Call me once before you decode any lines. |
| 943 | I decode votstrs into a hash table at op_hash (which I create). |
| 944 | I return an error text or null. |
| 945 | If you want, I will include the 'synthetic' jXXX instructions in the |
| 946 | instruction table. |
| 947 | You must nominate metacharacters for eg DEC's "#", "@", "^". */ |
| 948 | |
| 949 | static const char * |
| 950 | vip_begin (int synthetic_too, /* 1 means include jXXX op-codes. */ |
| 951 | const char *immediate, |
| 952 | const char *indirect, |
| 953 | const char *displen) |
| 954 | { |
| 955 | const struct vot *vP; /* scan votstrs */ |
| 956 | const char *retval = 0; /* error text */ |
| 957 | |
| 958 | op_hash = hash_new (); |
| 959 | |
| 960 | for (vP = votstrs; *vP->vot_name && !retval; vP++) |
| 961 | retval = hash_insert (op_hash, vP->vot_name, (void *) &vP->vot_detail); |
| 962 | |
| 963 | if (synthetic_too) |
| 964 | for (vP = synthetic_votstrs; *vP->vot_name && !retval; vP++) |
| 965 | retval = hash_insert (op_hash, vP->vot_name, (void *) &vP->vot_detail); |
| 966 | |
| 967 | #ifndef CONST_TABLE |
| 968 | vip_op_defaults (immediate, indirect, displen); |
| 969 | #endif |
| 970 | |
| 971 | return retval; |
| 972 | } |
| 973 | |
| 974 | /* Take 3 char.s, the last of which may be `\0` (non-existent) |
| 975 | and return the VAX register number that they represent. |
| 976 | |
| 977 | Return -1 if they don't form a register name. Good names return |
| 978 | a number from 0:15 inclusive. |
| 979 | |
| 980 | Case is not important in a name. |
| 981 | |
| 982 | Register names understood are: |
| 983 | |
| 984 | R0 |
| 985 | R1 |
| 986 | R2 |
| 987 | R3 |
| 988 | R4 |
| 989 | R5 |
| 990 | R6 |
| 991 | R7 |
| 992 | R8 |
| 993 | R9 |
| 994 | R10 |
| 995 | R11 |
| 996 | R12 AP |
| 997 | R13 FP |
| 998 | R14 SP |
| 999 | R15 PC */ |
| 1000 | |
| 1001 | #define AP 12 |
| 1002 | #define FP 13 |
| 1003 | #define SP 14 |
| 1004 | #define PC 15 |
| 1005 | |
| 1006 | /* Returns the register number of something like '%r15' or 'ap', supplied |
| 1007 | in four single chars. Returns -1 if the register isn't recognized, |
| 1008 | 0..15 otherwise. */ |
| 1009 | static int |
| 1010 | vax_reg_parse (char c1, char c2, char c3, char c4) |
| 1011 | { |
| 1012 | int retval = -1; |
| 1013 | |
| 1014 | #ifdef OBJ_ELF |
| 1015 | if (c1 != '%') /* Register prefixes are mandatory for ELF. */ |
| 1016 | return retval; |
| 1017 | c1 = c2; |
| 1018 | c2 = c3; |
| 1019 | c3 = c4; |
| 1020 | #endif |
| 1021 | #ifdef OBJ_VMS |
| 1022 | if (c4 != 0) /* Register prefixes are not allowed under VMS. */ |
| 1023 | return retval; |
| 1024 | #endif |
| 1025 | #ifdef OBJ_AOUT |
| 1026 | if (c1 == '%') /* Register prefixes are optional under a.out. */ |
| 1027 | { |
| 1028 | c1 = c2; |
| 1029 | c2 = c3; |
| 1030 | c3 = c4; |
| 1031 | } |
| 1032 | else if (c3 && c4) /* Can't be 4 characters long. */ |
| 1033 | return retval; |
| 1034 | #endif |
| 1035 | |
| 1036 | c1 = TOLOWER (c1); |
| 1037 | c2 = TOLOWER (c2); |
| 1038 | if (ISDIGIT (c2) && c1 == 'r') |
| 1039 | { |
| 1040 | retval = c2 - '0'; |
| 1041 | if (ISDIGIT (c3)) |
| 1042 | { |
| 1043 | retval = retval * 10 + c3 - '0'; |
| 1044 | retval = (retval > 15) ? -1 : retval; |
| 1045 | /* clamp the register value to 1 hex digit */ |
| 1046 | } |
| 1047 | else if (c3) |
| 1048 | retval = -1; /* c3 must be '\0' or a digit. */ |
| 1049 | } |
| 1050 | else if (c3) /* There are no three letter regs. */ |
| 1051 | retval = -1; |
| 1052 | else if (c2 == 'p') |
| 1053 | { |
| 1054 | switch (c1) |
| 1055 | { |
| 1056 | case 's': |
| 1057 | retval = SP; |
| 1058 | break; |
| 1059 | case 'f': |
| 1060 | retval = FP; |
| 1061 | break; |
| 1062 | case 'a': |
| 1063 | retval = AP; |
| 1064 | break; |
| 1065 | default: |
| 1066 | retval = -1; |
| 1067 | } |
| 1068 | } |
| 1069 | else if (c1 == 'p' && c2 == 'c') |
| 1070 | retval = PC; |
| 1071 | else |
| 1072 | retval = -1; |
| 1073 | return retval; |
| 1074 | } |
| 1075 | |
| 1076 | /* Parse a vax operand in DEC assembler notation. |
| 1077 | For speed, expect a string of whitespace to be reduced to a single ' '. |
| 1078 | This is the case for GNU AS, and is easy for other DEC-compatible |
| 1079 | assemblers. |
| 1080 | |
| 1081 | Knowledge about DEC VAX assembler operand notation lives here. |
| 1082 | This doesn't even know what a register name is, except it believes |
| 1083 | all register names are 2 or 3 characters, and lets vax_reg_parse() say |
| 1084 | what number each name represents. |
| 1085 | It does, however, know that PC, SP etc are special registers so it can |
| 1086 | detect addressing modes that are silly for those registers. |
| 1087 | |
| 1088 | Where possible, it delivers 1 fatal or 1 warning message if the operand |
| 1089 | is suspect. Exactly what we test for is still evolving. |
| 1090 | |
| 1091 | --- |
| 1092 | Arg block. |
| 1093 | |
| 1094 | There were a number of 'mismatched argument type' bugs to vip_op. |
| 1095 | The most general solution is to typedef each (of many) arguments. |
| 1096 | We used instead a typedef'd argument block. This is less modular |
| 1097 | than using separate return pointers for each result, but runs faster |
| 1098 | on most engines, and seems to keep programmers happy. It will have |
| 1099 | to be done properly if we ever want to use vip_op as a general-purpose |
| 1100 | module (it was designed to be). |
| 1101 | |
| 1102 | G^ |
| 1103 | |
| 1104 | Doesn't support DEC "G^" format operands. These always take 5 bytes |
| 1105 | to express, and code as modes 8F or 9F. Reason: "G^" deprives you of |
| 1106 | optimising to (say) a "B^" if you are lucky in the way you link. |
| 1107 | When someone builds a linker smart enough to convert "G^" to "B^", "W^" |
| 1108 | whenever possible, then we should implement it. |
| 1109 | If there is some other use for "G^", feel free to code it in! |
| 1110 | |
| 1111 | speed |
| 1112 | |
| 1113 | If I nested if()s more, I could avoid testing (*err) which would save |
| 1114 | time, space and page faults. I didn't nest all those if()s for clarity |
| 1115 | and because I think the mode testing can be re-arranged 1st to test the |
| 1116 | commoner constructs 1st. Does anybody have statistics on this? |
| 1117 | |
| 1118 | error messages |
| 1119 | |
| 1120 | In future, we should be able to 'compose' error messages in a scratch area |
| 1121 | and give the user MUCH more informative error messages. Although this takes |
| 1122 | a little more code at run-time, it will make this module much more self- |
| 1123 | documenting. As an example of what sucks now: most error messages have |
| 1124 | hardwired into them the DEC VAX metacharacters "#^@" which are nothing like |
| 1125 | the Un*x characters "$`*", that most users will expect from this AS. |
| 1126 | |
| 1127 | ---- |
| 1128 | |
| 1129 | The input is a string, ending with '\0'. |
| 1130 | |
| 1131 | We also require a 'hint' of what kind of operand is expected: so |
| 1132 | we can remind caller not to write into literals for instance. |
| 1133 | |
| 1134 | The output is a skeletal instruction. |
| 1135 | |
| 1136 | The algorithm has two parts. |
| 1137 | 1. extract the syntactic features (parse off all the @^#-()+[] mode crud); |
| 1138 | 2. express the @^#-()+[] as some parameters suited to further analysis. |
| 1139 | |
| 1140 | 2nd step is where we detect the googles of possible invalid combinations |
| 1141 | a human (or compiler) might write. Note that if we do a half-way |
| 1142 | decent assembler, we don't know how long to make (eg) displacement |
| 1143 | fields when we first meet them (because they may not have defined values). |
| 1144 | So we must wait until we know how many bits are needed for each address, |
| 1145 | then we can know both length and opcodes of instructions. |
| 1146 | For reason(s) above, we will pass to our caller a 'broken' instruction |
| 1147 | of these major components, from which our caller can generate instructions: |
| 1148 | - displacement length I^ S^ L^ B^ W^ unspecified |
| 1149 | - mode (many) |
| 1150 | - register R0-R15 or absent |
| 1151 | - index register R0-R15 or absent |
| 1152 | - expression text what we don't parse |
| 1153 | - error text(s) why we couldn't understand the operand |
| 1154 | |
| 1155 | ---- |
| 1156 | |
| 1157 | To decode output of this, test errtxt. If errtxt[0] == '\0', then |
| 1158 | we had no errors that prevented parsing. Also, if we ever report |
| 1159 | an internal bug, errtxt[0] is set non-zero. So one test tells you |
| 1160 | if the other outputs are to be taken seriously. |
| 1161 | |
| 1162 | ---- |
| 1163 | |
| 1164 | Dec defines the semantics of address modes (and values) |
| 1165 | by a two-letter code, explained here. |
| 1166 | |
| 1167 | letter 1: access type |
| 1168 | |
| 1169 | a address calculation - no data access, registers forbidden |
| 1170 | b branch displacement |
| 1171 | m read - let go of bus - write back "modify" |
| 1172 | r read |
| 1173 | v bit field address: like 'a' but registers are OK |
| 1174 | w write |
| 1175 | space no operator (eg ".long foo") [our convention] |
| 1176 | |
| 1177 | letter 2: data type (i.e. width, alignment) |
| 1178 | |
| 1179 | b byte |
| 1180 | d double precision floating point (D format) |
| 1181 | f single precision floating point (F format) |
| 1182 | g G format floating |
| 1183 | h H format floating |
| 1184 | l longword |
| 1185 | o octaword |
| 1186 | q quadword |
| 1187 | w word |
| 1188 | ? simple synthetic branch operand |
| 1189 | - unconditional synthetic JSB/JSR operand |
| 1190 | ! complex synthetic branch operand |
| 1191 | |
| 1192 | The '-?!' letter 2's are not for external consumption. They are used |
| 1193 | for various assemblers. Generally, all unknown widths are assumed 0. |
| 1194 | We don't limit your choice of width character. |
| 1195 | |
| 1196 | DEC operands are hard work to parse. For example, '@' as the first |
| 1197 | character means indirect (deferred) mode but elsewhere it is a shift |
| 1198 | operator. |
| 1199 | The long-winded explanation of how this is supposed to work is |
| 1200 | cancelled. Read a DEC vax manual. |
| 1201 | We try hard not to parse anything that MIGHT be part of the expression |
| 1202 | buried in that syntax. For example if we see @...(Rn) we don't check |
| 1203 | for '-' before the '(' because mode @-(Rn) does not exist. |
| 1204 | |
| 1205 | After parsing we have: |
| 1206 | |
| 1207 | at 1 if leading '@' (or Un*x '*') |
| 1208 | len takes one value from " bilsw". eg B^ -> 'b'. |
| 1209 | hash 1 if leading '#' (or Un*x '$') |
| 1210 | expr_begin, expr_end the expression we did not parse |
| 1211 | even though we don't interpret it, we make use |
| 1212 | of its presence or absence. |
| 1213 | sign -1: -(Rn) 0: absent +1: (Rn)+ |
| 1214 | paren 1 if () are around register |
| 1215 | reg major register number 0:15 -1 means absent |
| 1216 | ndx index register number 0:15 -1 means absent |
| 1217 | |
| 1218 | Again, I dare not explain it: just trace ALL the code! |
| 1219 | |
| 1220 | Summary of vip_op outputs. |
| 1221 | |
| 1222 | mode reg len ndx |
| 1223 | (Rn) => @Rn |
| 1224 | {@}Rn 5+@ n ' ' optional |
| 1225 | branch operand 0 -1 ' ' -1 |
| 1226 | S^#foo 0 -1 's' -1 |
| 1227 | -(Rn) 7 n ' ' optional |
| 1228 | {@}(Rn)+ 8+@ n ' ' optional |
| 1229 | {@}#foo, no S^ 8+@ PC " i" optional |
| 1230 | {@}{q^}{(Rn)} 10+@+q option " bwl" optional */ |
| 1231 | |
| 1232 | /* Dissect user-input 'optext' (which is something like "@B^foo@bar(AP)[FP]:") |
| 1233 | using the vop in vopP. vopP's vop_access and vop_width. We fill _ndx, _reg, |
| 1234 | _mode, _short, _warn, _error, _expr_begin, _expr_end and _nbytes. */ |
| 1235 | |
| 1236 | static void |
| 1237 | vip_op (char *optext, struct vop *vopP) |
| 1238 | { |
| 1239 | /* Track operand text forward. */ |
| 1240 | char *p; |
| 1241 | /* Track operand text backward. */ |
| 1242 | char *q; |
| 1243 | /* 1 if leading '@' ('*') seen. */ |
| 1244 | int at; |
| 1245 | /* one of " bilsw" */ |
| 1246 | char len; |
| 1247 | /* 1 if leading '#' ('$') seen. */ |
| 1248 | int hash; |
| 1249 | /* -1, 0 or +1. */ |
| 1250 | int sign = 0; |
| 1251 | /* 1 if () surround register. */ |
| 1252 | int paren = 0; |
| 1253 | /* Register number, -1:absent. */ |
| 1254 | int reg = 0; |
| 1255 | /* Index register number -1:absent. */ |
| 1256 | int ndx = 0; |
| 1257 | /* Report illegal operand, ""==OK. */ |
| 1258 | /* " " is a FAKE error: means we won. */ |
| 1259 | /* ANY err that begins with ' ' is a fake. */ |
| 1260 | /* " " is converted to "" before return. */ |
| 1261 | const char *err; |
| 1262 | /* Warn about weird modes pf address. */ |
| 1263 | const char *wrn; |
| 1264 | /* Preserve q in case we backup. */ |
| 1265 | char *oldq = NULL; |
| 1266 | /* Build up 4-bit operand mode here. */ |
| 1267 | /* Note: index mode is in ndx, this is. */ |
| 1268 | /* The major mode of operand address. */ |
| 1269 | int mode = 0; |
| 1270 | /* Notice how we move wrong-arg-type bugs INSIDE this module: if we |
| 1271 | get the types wrong below, we lose at compile time rather than at |
| 1272 | lint or run time. */ |
| 1273 | char access_mode; /* vop_access. */ |
| 1274 | |
| 1275 | access_mode = vopP->vop_access; |
| 1276 | /* None of our code bugs (yet), no user text errors, no warnings |
| 1277 | even. */ |
| 1278 | err = wrn = 0; |
| 1279 | |
| 1280 | p = optext; |
| 1281 | |
| 1282 | if (*p == ' ') /* Expect all whitespace reduced to ' '. */ |
| 1283 | p++; /* skip over whitespace */ |
| 1284 | |
| 1285 | if ((at = INDIRECTP (*p)) != 0) |
| 1286 | { /* 1 if *p=='@'(or '*' for Un*x) */ |
| 1287 | p++; /* at is determined */ |
| 1288 | if (*p == ' ') /* Expect all whitespace reduced to ' '. */ |
| 1289 | p++; /* skip over whitespace */ |
| 1290 | } |
| 1291 | |
| 1292 | /* This code is subtle. It tries to detect all legal (letter)'^' |
| 1293 | but it doesn't waste time explicitly testing for premature '\0' because |
| 1294 | this case is rejected as a mismatch against either (letter) or '^'. */ |
| 1295 | { |
| 1296 | char c; |
| 1297 | |
| 1298 | c = *p; |
| 1299 | c = TOLOWER (c); |
| 1300 | if (DISPLENP (p[1]) && strchr ("bilws", len = c)) |
| 1301 | p += 2; /* Skip (letter) '^'. */ |
| 1302 | else /* No (letter) '^' seen. */ |
| 1303 | len = ' '; /* Len is determined. */ |
| 1304 | } |
| 1305 | |
| 1306 | if (*p == ' ') /* Expect all whitespace reduced to ' '. */ |
| 1307 | p++; |
| 1308 | |
| 1309 | if ((hash = IMMEDIATEP (*p)) != 0) /* 1 if *p=='#' ('$' for Un*x) */ |
| 1310 | p++; /* Hash is determined. */ |
| 1311 | |
| 1312 | /* p points to what may be the beginning of an expression. |
| 1313 | We have peeled off the front all that is peelable. |
| 1314 | We know at, len, hash. |
| 1315 | |
| 1316 | Lets point q at the end of the text and parse that (backwards). */ |
| 1317 | |
| 1318 | for (q = p; *q; q++) |
| 1319 | ; |
| 1320 | q--; /* Now q points at last char of text. */ |
| 1321 | |
| 1322 | if (*q == ' ' && q >= p) /* Expect all whitespace reduced to ' '. */ |
| 1323 | q--; |
| 1324 | |
| 1325 | /* Reverse over whitespace, but don't. */ |
| 1326 | /* Run back over *p. */ |
| 1327 | |
| 1328 | /* As a matter of policy here, we look for [Rn], although both Rn and S^# |
| 1329 | forbid [Rn]. This is because it is easy, and because only a sick |
| 1330 | cyborg would have [...] trailing an expression in a VAX-like assembler. |
| 1331 | A meticulous parser would first check for Rn followed by '(' or '[' |
| 1332 | and not parse a trailing ']' if it found another. We just ban expressions |
| 1333 | ending in ']'. */ |
| 1334 | if (*q == ']') |
| 1335 | { |
| 1336 | while (q >= p && *q != '[') |
| 1337 | q--; |
| 1338 | /* Either q<p or we got matching '['. */ |
| 1339 | if (q < p) |
| 1340 | err = _("no '[' to match ']'"); |
| 1341 | else |
| 1342 | { |
| 1343 | /* Confusers like "[]" will eventually lose with a bad register |
| 1344 | * name error. So again we don't need to check for early '\0'. */ |
| 1345 | if (q[3] == ']') |
| 1346 | ndx = vax_reg_parse (q[1], q[2], 0, 0); |
| 1347 | else if (q[4] == ']') |
| 1348 | ndx = vax_reg_parse (q[1], q[2], q[3], 0); |
| 1349 | else if (q[5] == ']') |
| 1350 | ndx = vax_reg_parse (q[1], q[2], q[3], q[4]); |
| 1351 | else |
| 1352 | ndx = -1; |
| 1353 | /* Since we saw a ']' we will demand a register name in the []. |
| 1354 | * If luser hasn't given us one: be rude. */ |
| 1355 | if (ndx < 0) |
| 1356 | err = _("bad register in []"); |
| 1357 | else if (ndx == PC) |
| 1358 | err = _("[PC] index banned"); |
| 1359 | else |
| 1360 | /* Point q just before "[...]". */ |
| 1361 | q--; |
| 1362 | } |
| 1363 | } |
| 1364 | else |
| 1365 | /* No ']', so no iNDeX register. */ |
| 1366 | ndx = -1; |
| 1367 | |
| 1368 | /* If err = "..." then we lost: run away. |
| 1369 | Otherwise ndx == -1 if there was no "[...]". |
| 1370 | Otherwise, ndx is index register number, and q points before "[...]". */ |
| 1371 | |
| 1372 | if (*q == ' ' && q >= p) /* Expect all whitespace reduced to ' '. */ |
| 1373 | q--; |
| 1374 | /* Reverse over whitespace, but don't. */ |
| 1375 | /* Run back over *p. */ |
| 1376 | if (!err || !*err) |
| 1377 | { |
| 1378 | /* no ()+ or -() seen yet */ |
| 1379 | sign = 0; |
| 1380 | |
| 1381 | if (q > p + 3 && *q == '+' && q[-1] == ')') |
| 1382 | { |
| 1383 | sign = 1; /* we saw a ")+" */ |
| 1384 | q--; /* q points to ')' */ |
| 1385 | } |
| 1386 | |
| 1387 | if (*q == ')' && q > p + 2) |
| 1388 | { |
| 1389 | paren = 1; /* assume we have "(...)" */ |
| 1390 | while (q >= p && *q != '(') |
| 1391 | q--; |
| 1392 | /* either q<p or we got matching '(' */ |
| 1393 | if (q < p) |
| 1394 | err = _("no '(' to match ')'"); |
| 1395 | else |
| 1396 | { |
| 1397 | /* Confusers like "()" will eventually lose with a bad register |
| 1398 | name error. So again we don't need to check for early '\0'. */ |
| 1399 | if (q[3] == ')') |
| 1400 | reg = vax_reg_parse (q[1], q[2], 0, 0); |
| 1401 | else if (q[4] == ')') |
| 1402 | reg = vax_reg_parse (q[1], q[2], q[3], 0); |
| 1403 | else if (q[5] == ')') |
| 1404 | reg = vax_reg_parse (q[1], q[2], q[3], q[4]); |
| 1405 | else |
| 1406 | reg = -1; |
| 1407 | /* Since we saw a ')' we will demand a register name in the ')'. |
| 1408 | This is nasty: why can't our hypothetical assembler permit |
| 1409 | parenthesised expressions? BECAUSE I AM LAZY! That is why. |
| 1410 | Abuse luser if we didn't spy a register name. */ |
| 1411 | if (reg < 0) |
| 1412 | { |
| 1413 | /* JF allow parenthesized expressions. I hope this works. */ |
| 1414 | paren = 0; |
| 1415 | while (*q != ')') |
| 1416 | q++; |
| 1417 | /* err = "unknown register in ()"; */ |
| 1418 | } |
| 1419 | else |
| 1420 | q--; /* point just before '(' of "(...)" */ |
| 1421 | /* If err == "..." then we lost. Run away. |
| 1422 | Otherwise if reg >= 0 then we saw (Rn). */ |
| 1423 | } |
| 1424 | /* If err == "..." then we lost. |
| 1425 | Otherwise paren==1 and reg = register in "()". */ |
| 1426 | } |
| 1427 | else |
| 1428 | paren = 0; |
| 1429 | /* If err == "..." then we lost. |
| 1430 | Otherwise, q points just before "(Rn)", if any. |
| 1431 | If there was a "(...)" then paren==1, and reg is the register. */ |
| 1432 | |
| 1433 | /* We should only seek '-' of "-(...)" if: |
| 1434 | we saw "(...)" paren == 1 |
| 1435 | we have no errors so far ! *err |
| 1436 | we did not see '+' of "(...)+" sign < 1 |
| 1437 | We don't check len. We want a specific error message later if |
| 1438 | user tries "x^...-(Rn)". This is a feature not a bug. */ |
| 1439 | if (!err || !*err) |
| 1440 | { |
| 1441 | if (paren && sign < 1)/* !sign is adequate test */ |
| 1442 | { |
| 1443 | if (*q == '-') |
| 1444 | { |
| 1445 | sign = -1; |
| 1446 | q--; |
| 1447 | } |
| 1448 | } |
| 1449 | /* We have back-tracked over most |
| 1450 | of the crud at the end of an operand. |
| 1451 | Unless err, we know: sign, paren. If paren, we know reg. |
| 1452 | The last case is of an expression "Rn". |
| 1453 | This is worth hunting for if !err, !paren. |
| 1454 | We wouldn't be here if err. |
| 1455 | We remember to save q, in case we didn't want "Rn" anyway. */ |
| 1456 | if (!paren) |
| 1457 | { |
| 1458 | if (*q == ' ' && q >= p) /* Expect all whitespace reduced to ' '. */ |
| 1459 | q--; |
| 1460 | /* Reverse over whitespace, but don't. */ |
| 1461 | /* Run back over *p. */ |
| 1462 | /* Room for Rn or Rnn (include prefix) exactly? */ |
| 1463 | if (q > p && q < p + 4) |
| 1464 | reg = vax_reg_parse (p[0], p[1], |
| 1465 | q < p + 2 ? 0 : p[2], |
| 1466 | q < p + 3 ? 0 : p[3]); |
| 1467 | else |
| 1468 | reg = -1; /* Always comes here if no register at all. */ |
| 1469 | /* Here with a definitive reg value. */ |
| 1470 | if (reg >= 0) |
| 1471 | { |
| 1472 | oldq = q; |
| 1473 | q = p - 1; |
| 1474 | } |
| 1475 | } |
| 1476 | } |
| 1477 | } |
| 1478 | /* have reg. -1:absent; else 0:15. */ |
| 1479 | |
| 1480 | /* We have: err, at, len, hash, ndx, sign, paren, reg. |
| 1481 | Also, any remaining expression is from *p through *q inclusive. |
| 1482 | Should there be no expression, q==p-1. So expression length = q-p+1. |
| 1483 | This completes the first part: parsing the operand text. */ |
| 1484 | \f |
| 1485 | /* We now want to boil the data down, checking consistency on the way. |
| 1486 | We want: len, mode, reg, ndx, err, p, q, wrn, bug. |
| 1487 | We will deliver a 4-bit reg, and a 4-bit mode. */ |
| 1488 | |
| 1489 | /* Case of branch operand. Different. No L^B^W^I^S^ allowed for instance. |
| 1490 | |
| 1491 | in: at ? |
| 1492 | len ? |
| 1493 | hash ? |
| 1494 | p:q ? |
| 1495 | sign ? |
| 1496 | paren ? |
| 1497 | reg ? |
| 1498 | ndx ? |
| 1499 | |
| 1500 | out: mode 0 |
| 1501 | reg -1 |
| 1502 | len ' ' |
| 1503 | p:q whatever was input |
| 1504 | ndx -1 |
| 1505 | err " " or error message, and other outputs trashed. */ |
| 1506 | /* Branch operands have restricted forms. */ |
| 1507 | if ((!err || !*err) && access_mode == 'b') |
| 1508 | { |
| 1509 | if (at || hash || sign || paren || ndx >= 0 || reg >= 0 || len != ' ') |
| 1510 | err = _("invalid branch operand"); |
| 1511 | else |
| 1512 | err = " "; |
| 1513 | } |
| 1514 | |
| 1515 | /* Since nobody seems to use it: comment this 'feature'(?) out for now. */ |
| 1516 | #ifdef NEVER |
| 1517 | /* Case of stand-alone operand. e.g. ".long foo" |
| 1518 | |
| 1519 | in: at ? |
| 1520 | len ? |
| 1521 | hash ? |
| 1522 | p:q ? |
| 1523 | sign ? |
| 1524 | paren ? |
| 1525 | reg ? |
| 1526 | ndx ? |
| 1527 | |
| 1528 | out: mode 0 |
| 1529 | reg -1 |
| 1530 | len ' ' |
| 1531 | p:q whatever was input |
| 1532 | ndx -1 |
| 1533 | err " " or error message, and other outputs trashed. */ |
| 1534 | if ((!err || !*err) && access_mode == ' ') |
| 1535 | { |
| 1536 | if (at) |
| 1537 | err = _("address prohibits @"); |
| 1538 | else if (hash) |
| 1539 | err = _("address prohibits #"); |
| 1540 | else if (sign) |
| 1541 | { |
| 1542 | if (sign < 0) |
| 1543 | err = _("address prohibits -()"); |
| 1544 | else |
| 1545 | err = _("address prohibits ()+"); |
| 1546 | } |
| 1547 | else if (paren) |
| 1548 | err = _("address prohibits ()"); |
| 1549 | else if (ndx >= 0) |
| 1550 | err = _("address prohibits []"); |
| 1551 | else if (reg >= 0) |
| 1552 | err = _("address prohibits register"); |
| 1553 | else if (len != ' ') |
| 1554 | err = _("address prohibits displacement length specifier"); |
| 1555 | else |
| 1556 | { |
| 1557 | err = " "; /* succeed */ |
| 1558 | mode = 0; |
| 1559 | } |
| 1560 | } |
| 1561 | #endif |
| 1562 | |
| 1563 | /* Case of S^#. |
| 1564 | |
| 1565 | in: at 0 |
| 1566 | len 's' definition |
| 1567 | hash 1 demand |
| 1568 | p:q demand not empty |
| 1569 | sign 0 by paren==0 |
| 1570 | paren 0 by "()" scan logic because "S^" seen |
| 1571 | reg -1 or nn by mistake |
| 1572 | ndx -1 |
| 1573 | |
| 1574 | out: mode 0 |
| 1575 | reg -1 |
| 1576 | len 's' |
| 1577 | exp |
| 1578 | ndx -1 */ |
| 1579 | if ((!err || !*err) && len == 's') |
| 1580 | { |
| 1581 | if (!hash || paren || at || ndx >= 0) |
| 1582 | err = _("invalid operand of S^#"); |
| 1583 | else |
| 1584 | { |
| 1585 | if (reg >= 0) |
| 1586 | { |
| 1587 | /* Darn! we saw S^#Rnn ! put the Rnn back in |
| 1588 | expression. KLUDGE! Use oldq so we don't |
| 1589 | need to know exact length of reg name. */ |
| 1590 | q = oldq; |
| 1591 | reg = 0; |
| 1592 | } |
| 1593 | /* We have all the expression we will ever get. */ |
| 1594 | if (p > q) |
| 1595 | err = _("S^# needs expression"); |
| 1596 | else if (access_mode == 'r') |
| 1597 | { |
| 1598 | err = " "; /* WIN! */ |
| 1599 | mode = 0; |
| 1600 | } |
| 1601 | else |
| 1602 | err = _("S^# may only read-access"); |
| 1603 | } |
| 1604 | } |
| 1605 | |
| 1606 | /* Case of -(Rn), which is weird case. |
| 1607 | |
| 1608 | in: at 0 |
| 1609 | len ' |
| 1610 | hash 0 |
| 1611 | p:q q<p |
| 1612 | sign -1 by definition |
| 1613 | paren 1 by definition |
| 1614 | reg present by definition |
| 1615 | ndx optional |
| 1616 | |
| 1617 | out: mode 7 |
| 1618 | reg present |
| 1619 | len ' ' |
| 1620 | exp "" enforce empty expression |
| 1621 | ndx optional warn if same as reg. */ |
| 1622 | if ((!err || !*err) && sign < 0) |
| 1623 | { |
| 1624 | if (len != ' ' || hash || at || p <= q) |
| 1625 | err = _("invalid operand of -()"); |
| 1626 | else |
| 1627 | { |
| 1628 | err = " "; /* win */ |
| 1629 | mode = 7; |
| 1630 | if (reg == PC) |
| 1631 | wrn = _("-(PC) unpredictable"); |
| 1632 | else if (reg == ndx) |
| 1633 | wrn = _("[]index same as -()register: unpredictable"); |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | /* We convert "(Rn)" to "@Rn" for our convenience. |
| 1638 | (I hope this is convenient: has someone got a better way to parse this?) |
| 1639 | A side-effect of this is that "@Rn" is a valid operand. */ |
| 1640 | if (paren && !sign && !hash && !at && len == ' ' && p > q) |
| 1641 | { |
| 1642 | at = 1; |
| 1643 | paren = 0; |
| 1644 | } |
| 1645 | |
| 1646 | /* Case of (Rn)+, which is slightly different. |
| 1647 | |
| 1648 | in: at |
| 1649 | len ' ' |
| 1650 | hash 0 |
| 1651 | p:q q<p |
| 1652 | sign +1 by definition |
| 1653 | paren 1 by definition |
| 1654 | reg present by definition |
| 1655 | ndx optional |
| 1656 | |
| 1657 | out: mode 8+@ |
| 1658 | reg present |
| 1659 | len ' ' |
| 1660 | exp "" enforce empty expression |
| 1661 | ndx optional warn if same as reg. */ |
| 1662 | if ((!err || !*err) && sign > 0) |
| 1663 | { |
| 1664 | if (len != ' ' || hash || p <= q) |
| 1665 | err = _("invalid operand of ()+"); |
| 1666 | else |
| 1667 | { |
| 1668 | err = " "; /* win */ |
| 1669 | mode = 8 + (at ? 1 : 0); |
| 1670 | if (reg == PC) |
| 1671 | wrn = _("(PC)+ unpredictable"); |
| 1672 | else if (reg == ndx) |
| 1673 | wrn = _("[]index same as ()+register: unpredictable"); |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | /* Case of #, without S^. |
| 1678 | |
| 1679 | in: at |
| 1680 | len ' ' or 'i' |
| 1681 | hash 1 by definition |
| 1682 | p:q |
| 1683 | sign 0 |
| 1684 | paren 0 |
| 1685 | reg absent |
| 1686 | ndx optional |
| 1687 | |
| 1688 | out: mode 8+@ |
| 1689 | reg PC |
| 1690 | len ' ' or 'i' |
| 1691 | exp |
| 1692 | ndx optional. */ |
| 1693 | if ((!err || !*err) && hash) |
| 1694 | { |
| 1695 | if (len != 'i' && len != ' ') |
| 1696 | err = _("# conflicts length"); |
| 1697 | else if (paren) |
| 1698 | err = _("# bars register"); |
| 1699 | else |
| 1700 | { |
| 1701 | if (reg >= 0) |
| 1702 | { |
| 1703 | /* Darn! we saw #Rnn! Put the Rnn back into the expression. |
| 1704 | By using oldq, we don't need to know how long Rnn was. |
| 1705 | KLUDGE! */ |
| 1706 | q = oldq; |
| 1707 | reg = -1; /* No register any more. */ |
| 1708 | } |
| 1709 | err = " "; /* Win. */ |
| 1710 | |
| 1711 | /* JF a bugfix, I think! */ |
| 1712 | if (at && access_mode == 'a') |
| 1713 | vopP->vop_nbytes = 4; |
| 1714 | |
| 1715 | mode = (at ? 9 : 8); |
| 1716 | reg = PC; |
| 1717 | if ((access_mode == 'm' || access_mode == 'w') && !at) |
| 1718 | wrn = _("writing or modifying # is unpredictable"); |
| 1719 | } |
| 1720 | } |
| 1721 | /* If !*err, then sign == 0 |
| 1722 | hash == 0 */ |
| 1723 | |
| 1724 | /* Case of Rn. We separate this one because it has a few special |
| 1725 | errors the remaining modes lack. |
| 1726 | |
| 1727 | in: at optional |
| 1728 | len ' ' |
| 1729 | hash 0 by program logic |
| 1730 | p:q empty |
| 1731 | sign 0 by program logic |
| 1732 | paren 0 by definition |
| 1733 | reg present by definition |
| 1734 | ndx optional |
| 1735 | |
| 1736 | out: mode 5+@ |
| 1737 | reg present |
| 1738 | len ' ' enforce no length |
| 1739 | exp "" enforce empty expression |
| 1740 | ndx optional warn if same as reg. */ |
| 1741 | if ((!err || !*err) && !paren && reg >= 0) |
| 1742 | { |
| 1743 | if (len != ' ') |
| 1744 | err = _("length not needed"); |
| 1745 | else if (at) |
| 1746 | { |
| 1747 | err = " "; /* win */ |
| 1748 | mode = 6; /* @Rn */ |
| 1749 | } |
| 1750 | else if (ndx >= 0) |
| 1751 | err = _("can't []index a register, because it has no address"); |
| 1752 | else if (access_mode == 'a') |
| 1753 | err = _("a register has no address"); |
| 1754 | else |
| 1755 | { |
| 1756 | /* Idea here is to detect from length of datum |
| 1757 | and from register number if we will touch PC. |
| 1758 | Warn if we do. |
| 1759 | vop_nbytes is number of bytes in operand. |
| 1760 | Compute highest byte affected, compare to PC0. */ |
| 1761 | if ((vopP->vop_nbytes + reg * 4) > 60) |
| 1762 | wrn = _("PC part of operand unpredictable"); |
| 1763 | err = " "; /* win */ |
| 1764 | mode = 5; /* Rn */ |
| 1765 | } |
| 1766 | } |
| 1767 | /* If !*err, sign == 0 |
| 1768 | hash == 0 |
| 1769 | paren == 1 OR reg==-1 */ |
| 1770 | |
| 1771 | /* Rest of cases fit into one bunch. |
| 1772 | |
| 1773 | in: at optional |
| 1774 | len ' ' or 'b' or 'w' or 'l' |
| 1775 | hash 0 by program logic |
| 1776 | p:q expected (empty is not an error) |
| 1777 | sign 0 by program logic |
| 1778 | paren optional |
| 1779 | reg optional |
| 1780 | ndx optional |
| 1781 | |
| 1782 | out: mode 10 + @ + len |
| 1783 | reg optional |
| 1784 | len ' ' or 'b' or 'w' or 'l' |
| 1785 | exp maybe empty |
| 1786 | ndx optional warn if same as reg. */ |
| 1787 | if (!err || !*err) |
| 1788 | { |
| 1789 | err = " "; /* win (always) */ |
| 1790 | mode = 10 + (at ? 1 : 0); |
| 1791 | switch (len) |
| 1792 | { |
| 1793 | case 'l': |
| 1794 | mode += 2; |
| 1795 | case 'w': |
| 1796 | mode += 2; |
| 1797 | case ' ': /* Assumed B^ until our caller changes it. */ |
| 1798 | case 'b': |
| 1799 | break; |
| 1800 | } |
| 1801 | } |
| 1802 | |
| 1803 | /* here with completely specified mode |
| 1804 | len |
| 1805 | reg |
| 1806 | expression p,q |
| 1807 | ndx. */ |
| 1808 | |
| 1809 | if (*err == ' ') |
| 1810 | err = 0; /* " " is no longer an error. */ |
| 1811 | |
| 1812 | vopP->vop_mode = mode; |
| 1813 | vopP->vop_reg = reg; |
| 1814 | vopP->vop_short = len; |
| 1815 | vopP->vop_expr_begin = p; |
| 1816 | vopP->vop_expr_end = q; |
| 1817 | vopP->vop_ndx = ndx; |
| 1818 | vopP->vop_error = err; |
| 1819 | vopP->vop_warn = wrn; |
| 1820 | } |
| 1821 | |
| 1822 | /* This converts a string into a vax instruction. |
| 1823 | The string must be a bare single instruction in dec-vax (with BSD4 frobs) |
| 1824 | format. |
| 1825 | It provides some error messages: at most one fatal error message (which |
| 1826 | stops the scan) and at most one warning message for each operand. |
| 1827 | The vax instruction is returned in exploded form, since we have no |
| 1828 | knowledge of how you parse (or evaluate) your expressions. |
| 1829 | We do however strip off and decode addressing modes and operation |
| 1830 | mnemonic. |
| 1831 | |
| 1832 | The exploded instruction is returned to a struct vit of your choice. |
| 1833 | #include "vax-inst.h" to know what a struct vit is. |
| 1834 | |
| 1835 | This function's value is a string. If it is not "" then an internal |
| 1836 | logic error was found: read this code to assign meaning to the string. |
| 1837 | No argument string should generate such an error string: |
| 1838 | it means a bug in our code, not in the user's text. |
| 1839 | |
| 1840 | You MUST have called vip_begin() once before using this function. */ |
| 1841 | |
| 1842 | static void |
| 1843 | vip (struct vit *vitP, /* We build an exploded instruction here. */ |
| 1844 | char *instring) /* Text of a vax instruction: we modify. */ |
| 1845 | { |
| 1846 | /* How to bit-encode this opcode. */ |
| 1847 | struct vot_wot *vwP; |
| 1848 | /* 1/skip whitespace.2/scan vot_how */ |
| 1849 | char *p; |
| 1850 | char *q; |
| 1851 | /* counts number of operands seen */ |
| 1852 | unsigned char count; |
| 1853 | /* scan operands in struct vit */ |
| 1854 | struct vop *operandp; |
| 1855 | /* error over all operands */ |
| 1856 | const char *alloperr; |
| 1857 | /* Remember char, (we clobber it with '\0' temporarily). */ |
| 1858 | char c; |
| 1859 | /* Op-code of this instruction. */ |
| 1860 | vax_opcodeT oc; |
| 1861 | |
| 1862 | if (*instring == ' ') |
| 1863 | ++instring; |
| 1864 | |
| 1865 | /* MUST end in end-of-string or exactly 1 space. */ |
| 1866 | for (p = instring; *p && *p != ' '; p++) |
| 1867 | ; |
| 1868 | |
| 1869 | /* Scanned up to end of operation-code. */ |
| 1870 | /* Operation-code is ended with whitespace. */ |
| 1871 | if (p - instring == 0) |
| 1872 | { |
| 1873 | vitP->vit_error = _("No operator"); |
| 1874 | count = 0; |
| 1875 | memset (vitP->vit_opcode, '\0', sizeof (vitP->vit_opcode)); |
| 1876 | } |
| 1877 | else |
| 1878 | { |
| 1879 | c = *p; |
| 1880 | *p = '\0'; |
| 1881 | /* Here with instring pointing to what better be an op-name, and p |
| 1882 | pointing to character just past that. |
| 1883 | We trust instring points to an op-name, with no whitespace. */ |
| 1884 | vwP = (struct vot_wot *) hash_find (op_hash, instring); |
| 1885 | /* Restore char after op-code. */ |
| 1886 | *p = c; |
| 1887 | if (vwP == 0) |
| 1888 | { |
| 1889 | vitP->vit_error = _("Unknown operator"); |
| 1890 | count = 0; |
| 1891 | memset (vitP->vit_opcode, '\0', sizeof (vitP->vit_opcode)); |
| 1892 | } |
| 1893 | else |
| 1894 | { |
| 1895 | /* We found a match! So let's pick up as many operands as the |
| 1896 | instruction wants, and even gripe if there are too many. |
| 1897 | We expect comma to separate each operand. |
| 1898 | We let instring track the text, while p tracks a part of the |
| 1899 | struct vot. */ |
| 1900 | const char *howp; |
| 1901 | /* The lines below know about 2-byte opcodes starting FD,FE or FF. |
| 1902 | They also understand synthetic opcodes. Note: |
| 1903 | we return 32 bits of opcode, including bucky bits, BUT |
| 1904 | an opcode length is either 8 or 16 bits for vit_opcode_nbytes. */ |
| 1905 | oc = vwP->vot_code; /* The op-code. */ |
| 1906 | vitP->vit_opcode_nbytes = (oc & 0xFF) >= 0xFD ? 2 : 1; |
| 1907 | md_number_to_chars (vitP->vit_opcode, oc, 4); |
| 1908 | count = 0; /* No operands seen yet. */ |
| 1909 | instring = p; /* Point just past operation code. */ |
| 1910 | alloperr = ""; |
| 1911 | for (howp = vwP->vot_how, operandp = vitP->vit_operand; |
| 1912 | !(alloperr && *alloperr) && *howp; |
| 1913 | operandp++, howp += 2) |
| 1914 | { |
| 1915 | /* Here to parse one operand. Leave instring pointing just |
| 1916 | past any one ',' that marks the end of this operand. */ |
| 1917 | if (!howp[1]) |
| 1918 | as_fatal (_("odd number of bytes in operand description")); |
| 1919 | else if (*instring) |
| 1920 | { |
| 1921 | for (q = instring; (c = *q) && c != ','; q++) |
| 1922 | ; |
| 1923 | /* Q points to ',' or '\0' that ends argument. C is that |
| 1924 | character. */ |
| 1925 | *q = 0; |
| 1926 | operandp->vop_width = howp[1]; |
| 1927 | operandp->vop_nbytes = vax_operand_width_size[(unsigned) howp[1]]; |
| 1928 | operandp->vop_access = howp[0]; |
| 1929 | vip_op (instring, operandp); |
| 1930 | *q = c; /* Restore input text. */ |
| 1931 | if (operandp->vop_error) |
| 1932 | alloperr = _("Bad operand"); |
| 1933 | instring = q + (c ? 1 : 0); /* Next operand (if any). */ |
| 1934 | count++; /* Won another argument, may have an operr. */ |
| 1935 | } |
| 1936 | else |
| 1937 | alloperr = _("Not enough operands"); |
| 1938 | } |
| 1939 | if (!*alloperr) |
| 1940 | { |
| 1941 | if (*instring == ' ') |
| 1942 | instring++; |
| 1943 | if (*instring) |
| 1944 | alloperr = _("Too many operands"); |
| 1945 | } |
| 1946 | vitP->vit_error = alloperr; |
| 1947 | } |
| 1948 | } |
| 1949 | vitP->vit_operands = count; |
| 1950 | } |
| 1951 | \f |
| 1952 | #ifdef test |
| 1953 | |
| 1954 | /* Test program for above. */ |
| 1955 | |
| 1956 | struct vit myvit; /* Build an exploded vax instruction here. */ |
| 1957 | char answer[100]; /* Human types a line of vax assembler here. */ |
| 1958 | char *mybug; /* "" or an internal logic diagnostic. */ |
| 1959 | int mycount; /* Number of operands. */ |
| 1960 | struct vop *myvop; /* Scan operands from myvit. */ |
| 1961 | int mysynth; /* 1 means want synthetic opcodes. */ |
| 1962 | char my_immediate[200]; |
| 1963 | char my_indirect[200]; |
| 1964 | char my_displen[200]; |
| 1965 | |
| 1966 | int |
| 1967 | main (void) |
| 1968 | { |
| 1969 | char *p; |
| 1970 | |
| 1971 | printf ("0 means no synthetic instructions. "); |
| 1972 | printf ("Value for vip_begin? "); |
| 1973 | gets (answer); |
| 1974 | sscanf (answer, "%d", &mysynth); |
| 1975 | printf ("Synthetic opcodes %s be included.\n", mysynth ? "will" : "will not"); |
| 1976 | printf ("enter immediate symbols eg enter # "); |
| 1977 | gets (my_immediate); |
| 1978 | printf ("enter indirect symbols eg enter @ "); |
| 1979 | gets (my_indirect); |
| 1980 | printf ("enter displen symbols eg enter ^ "); |
| 1981 | gets (my_displen); |
| 1982 | |
| 1983 | if (p = vip_begin (mysynth, my_immediate, my_indirect, my_displen)) |
| 1984 | error ("vip_begin=%s", p); |
| 1985 | |
| 1986 | printf ("An empty input line will quit you from the vax instruction parser\n"); |
| 1987 | for (;;) |
| 1988 | { |
| 1989 | printf ("vax instruction: "); |
| 1990 | fflush (stdout); |
| 1991 | gets (answer); |
| 1992 | if (!*answer) |
| 1993 | break; /* Out of for each input text loop. */ |
| 1994 | |
| 1995 | vip (& myvit, answer); |
| 1996 | if (*myvit.vit_error) |
| 1997 | printf ("ERR:\"%s\"\n", myvit.vit_error); |
| 1998 | |
| 1999 | printf ("opcode="); |
| 2000 | for (mycount = myvit.vit_opcode_nbytes, p = myvit.vit_opcode; |
| 2001 | mycount; |
| 2002 | mycount--, p++) |
| 2003 | printf ("%02x ", *p & 0xFF); |
| 2004 | |
| 2005 | printf (" operand count=%d.\n", mycount = myvit.vit_operands); |
| 2006 | for (myvop = myvit.vit_operand; mycount; mycount--, myvop++) |
| 2007 | { |
| 2008 | printf ("mode=%xx reg=%xx ndx=%xx len='%c'=%c%c%d. expr=\"", |
| 2009 | myvop->vop_mode, myvop->vop_reg, myvop->vop_ndx, |
| 2010 | myvop->vop_short, myvop->vop_access, myvop->vop_width, |
| 2011 | myvop->vop_nbytes); |
| 2012 | for (p = myvop->vop_expr_begin; p <= myvop->vop_expr_end; p++) |
| 2013 | putchar (*p); |
| 2014 | |
| 2015 | printf ("\"\n"); |
| 2016 | if (myvop->vop_error) |
| 2017 | printf (" err:\"%s\"\n", myvop->vop_error); |
| 2018 | |
| 2019 | if (myvop->vop_warn) |
| 2020 | printf (" wrn:\"%s\"\n", myvop->vop_warn); |
| 2021 | } |
| 2022 | } |
| 2023 | vip_end (); |
| 2024 | exit (EXIT_SUCCESS); |
| 2025 | } |
| 2026 | |
| 2027 | #endif |
| 2028 | \f |
| 2029 | #ifdef TEST /* #Define to use this testbed. */ |
| 2030 | |
| 2031 | /* Follows a test program for this function. |
| 2032 | We declare arrays non-local in case some of our tiny-minded machines |
| 2033 | default to small stacks. Also, helps with some debuggers. */ |
| 2034 | |
| 2035 | char answer[100]; /* Human types into here. */ |
| 2036 | char *p; /* */ |
| 2037 | char *myerr; |
| 2038 | char *mywrn; |
| 2039 | char *mybug; |
| 2040 | char myaccess; |
| 2041 | char mywidth; |
| 2042 | char mymode; |
| 2043 | char myreg; |
| 2044 | char mylen; |
| 2045 | char *myleft; |
| 2046 | char *myright; |
| 2047 | char myndx; |
| 2048 | int my_operand_length; |
| 2049 | char my_immediate[200]; |
| 2050 | char my_indirect[200]; |
| 2051 | char my_displen[200]; |
| 2052 | |
| 2053 | int |
| 2054 | main (void) |
| 2055 | { |
| 2056 | printf ("enter immediate symbols eg enter # "); |
| 2057 | gets (my_immediate); |
| 2058 | printf ("enter indirect symbols eg enter @ "); |
| 2059 | gets (my_indirect); |
| 2060 | printf ("enter displen symbols eg enter ^ "); |
| 2061 | gets (my_displen); |
| 2062 | vip_op_defaults (my_immediate, my_indirect, my_displen); |
| 2063 | |
| 2064 | for (;;) |
| 2065 | { |
| 2066 | printf ("access,width (eg 'ab' or 'wh') [empty line to quit] : "); |
| 2067 | fflush (stdout); |
| 2068 | gets (answer); |
| 2069 | if (!answer[0]) |
| 2070 | exit (EXIT_SUCCESS); |
| 2071 | myaccess = answer[0]; |
| 2072 | mywidth = answer[1]; |
| 2073 | switch (mywidth) |
| 2074 | { |
| 2075 | case 'b': |
| 2076 | my_operand_length = 1; |
| 2077 | break; |
| 2078 | case 'd': |
| 2079 | my_operand_length = 8; |
| 2080 | break; |
| 2081 | case 'f': |
| 2082 | my_operand_length = 4; |
| 2083 | break; |
| 2084 | case 'g': |
| 2085 | my_operand_length = 16; |
| 2086 | break; |
| 2087 | case 'h': |
| 2088 | my_operand_length = 32; |
| 2089 | break; |
| 2090 | case 'l': |
| 2091 | my_operand_length = 4; |
| 2092 | break; |
| 2093 | case 'o': |
| 2094 | my_operand_length = 16; |
| 2095 | break; |
| 2096 | case 'q': |
| 2097 | my_operand_length = 8; |
| 2098 | break; |
| 2099 | case 'w': |
| 2100 | my_operand_length = 2; |
| 2101 | break; |
| 2102 | case '!': |
| 2103 | case '?': |
| 2104 | case '-': |
| 2105 | my_operand_length = 0; |
| 2106 | break; |
| 2107 | |
| 2108 | default: |
| 2109 | my_operand_length = 2; |
| 2110 | printf ("I dn't understand access width %c\n", mywidth); |
| 2111 | break; |
| 2112 | } |
| 2113 | printf ("VAX assembler instruction operand: "); |
| 2114 | fflush (stdout); |
| 2115 | gets (answer); |
| 2116 | mybug = vip_op (answer, myaccess, mywidth, my_operand_length, |
| 2117 | &mymode, &myreg, &mylen, &myleft, &myright, &myndx, |
| 2118 | &myerr, &mywrn); |
| 2119 | if (*myerr) |
| 2120 | { |
| 2121 | printf ("error: \"%s\"\n", myerr); |
| 2122 | if (*mybug) |
| 2123 | printf (" bug: \"%s\"\n", mybug); |
| 2124 | } |
| 2125 | else |
| 2126 | { |
| 2127 | if (*mywrn) |
| 2128 | printf ("warning: \"%s\"\n", mywrn); |
| 2129 | mumble ("mode", mymode); |
| 2130 | mumble ("register", myreg); |
| 2131 | mumble ("index", myndx); |
| 2132 | printf ("width:'%c' ", mylen); |
| 2133 | printf ("expression: \""); |
| 2134 | while (myleft <= myright) |
| 2135 | putchar (*myleft++); |
| 2136 | printf ("\"\n"); |
| 2137 | } |
| 2138 | } |
| 2139 | } |
| 2140 | |
| 2141 | void |
| 2142 | mumble (char *text, int value) |
| 2143 | { |
| 2144 | printf ("%s:", text); |
| 2145 | if (value >= 0) |
| 2146 | printf ("%xx", value); |
| 2147 | else |
| 2148 | printf ("ABSENT"); |
| 2149 | printf (" "); |
| 2150 | } |
| 2151 | |
| 2152 | #endif |
| 2153 | |
| 2154 | int md_short_jump_size = 3; |
| 2155 | int md_long_jump_size = 6; |
| 2156 | |
| 2157 | void |
| 2158 | md_create_short_jump (char *ptr, |
| 2159 | addressT from_addr, |
| 2160 | addressT to_addr ATTRIBUTE_UNUSED, |
| 2161 | fragS *frag ATTRIBUTE_UNUSED, |
| 2162 | symbolS *to_symbol ATTRIBUTE_UNUSED) |
| 2163 | { |
| 2164 | valueT offset; |
| 2165 | |
| 2166 | /* This former calculation was off by two: |
| 2167 | offset = to_addr - (from_addr + 1); |
| 2168 | We need to account for the one byte instruction and also its |
| 2169 | two byte operand. */ |
| 2170 | offset = to_addr - (from_addr + 1 + 2); |
| 2171 | *ptr++ = VAX_BRW; /* Branch with word (16 bit) offset. */ |
| 2172 | md_number_to_chars (ptr, offset, 2); |
| 2173 | } |
| 2174 | |
| 2175 | void |
| 2176 | md_create_long_jump (char *ptr, |
| 2177 | addressT from_addr ATTRIBUTE_UNUSED, |
| 2178 | addressT to_addr, |
| 2179 | fragS *frag, |
| 2180 | symbolS *to_symbol) |
| 2181 | { |
| 2182 | valueT offset; |
| 2183 | |
| 2184 | offset = to_addr - S_GET_VALUE (to_symbol); |
| 2185 | *ptr++ = VAX_JMP; /* Arbitrary jump. */ |
| 2186 | *ptr++ = VAX_ABSOLUTE_MODE; |
| 2187 | md_number_to_chars (ptr, offset, 4); |
| 2188 | fix_new (frag, ptr - frag->fr_literal, 4, to_symbol, (long) 0, 0, NO_RELOC); |
| 2189 | } |
| 2190 | \f |
| 2191 | #ifdef OBJ_VMS |
| 2192 | const char *md_shortopts = "d:STt:V+1h:Hv::"; |
| 2193 | #elif defined(OBJ_ELF) |
| 2194 | const char *md_shortopts = "d:STt:VkKQ:"; |
| 2195 | #else |
| 2196 | const char *md_shortopts = "d:STt:V"; |
| 2197 | #endif |
| 2198 | struct option md_longopts[] = |
| 2199 | { |
| 2200 | #ifdef OBJ_ELF |
| 2201 | #define OPTION_PIC (OPTION_MD_BASE) |
| 2202 | { "pic", no_argument, NULL, OPTION_PIC }, |
| 2203 | #endif |
| 2204 | { NULL, no_argument, NULL, 0 } |
| 2205 | }; |
| 2206 | size_t md_longopts_size = sizeof (md_longopts); |
| 2207 | |
| 2208 | int |
| 2209 | md_parse_option (int c, char *arg) |
| 2210 | { |
| 2211 | switch (c) |
| 2212 | { |
| 2213 | case 'S': |
| 2214 | as_warn (_("SYMBOL TABLE not implemented")); |
| 2215 | break; |
| 2216 | |
| 2217 | case 'T': |
| 2218 | as_warn (_("TOKEN TRACE not implemented")); |
| 2219 | break; |
| 2220 | |
| 2221 | case 'd': |
| 2222 | as_warn (_("Displacement length %s ignored!"), arg); |
| 2223 | break; |
| 2224 | |
| 2225 | case 't': |
| 2226 | as_warn (_("I don't need or use temp. file \"%s\"."), arg); |
| 2227 | break; |
| 2228 | |
| 2229 | case 'V': |
| 2230 | as_warn (_("I don't use an interpass file! -V ignored")); |
| 2231 | break; |
| 2232 | |
| 2233 | #ifdef OBJ_VMS |
| 2234 | case '+': /* For g++. Hash any name > 31 chars long. */ |
| 2235 | flag_hash_long_names = 1; |
| 2236 | break; |
| 2237 | |
| 2238 | case '1': /* For backward compatibility. */ |
| 2239 | flag_one = 1; |
| 2240 | break; |
| 2241 | |
| 2242 | case 'H': /* Show new symbol after hash truncation. */ |
| 2243 | flag_show_after_trunc = 1; |
| 2244 | break; |
| 2245 | |
| 2246 | case 'h': /* No hashing of mixed-case names. */ |
| 2247 | { |
| 2248 | extern char vms_name_mapping; |
| 2249 | vms_name_mapping = atoi (arg); |
| 2250 | flag_no_hash_mixed_case = 1; |
| 2251 | } |
| 2252 | break; |
| 2253 | |
| 2254 | case 'v': |
| 2255 | { |
| 2256 | extern char *compiler_version_string; |
| 2257 | |
| 2258 | if (!arg || !*arg || access (arg, 0) == 0) |
| 2259 | return 0; /* Have caller show the assembler version. */ |
| 2260 | compiler_version_string = arg; |
| 2261 | } |
| 2262 | break; |
| 2263 | #endif |
| 2264 | |
| 2265 | #ifdef OBJ_ELF |
| 2266 | case OPTION_PIC: |
| 2267 | case 'k': |
| 2268 | flag_want_pic = 1; |
| 2269 | break; /* -pic, Position Independent Code. */ |
| 2270 | |
| 2271 | /* -Qy, -Qn: SVR4 arguments controlling whether a .comment |
| 2272 | section should be emitted or not. FIXME: Not implemented. */ |
| 2273 | case 'Q': |
| 2274 | break; |
| 2275 | #endif |
| 2276 | |
| 2277 | default: |
| 2278 | return 0; |
| 2279 | } |
| 2280 | |
| 2281 | return 1; |
| 2282 | } |
| 2283 | |
| 2284 | void |
| 2285 | md_show_usage (FILE *stream) |
| 2286 | { |
| 2287 | fprintf (stream, _("\ |
| 2288 | VAX options:\n\ |
| 2289 | -d LENGTH ignored\n\ |
| 2290 | -J ignored\n\ |
| 2291 | -S ignored\n\ |
| 2292 | -t FILE ignored\n\ |
| 2293 | -T ignored\n\ |
| 2294 | -V ignored\n")); |
| 2295 | #ifdef OBJ_VMS |
| 2296 | fprintf (stream, _("\ |
| 2297 | VMS options:\n\ |
| 2298 | -+ hash encode names longer than 31 characters\n\ |
| 2299 | -1 `const' handling compatible with gcc 1.x\n\ |
| 2300 | -H show new symbol after hash truncation\n\ |
| 2301 | -h NUM don't hash mixed-case names, and adjust case:\n\ |
| 2302 | 0 = upper, 2 = lower, 3 = preserve case\n\ |
| 2303 | -v\"VERSION\" code being assembled was produced by compiler \"VERSION\"\n")); |
| 2304 | #endif |
| 2305 | } |
| 2306 | \f |
| 2307 | /* We have no need to default values of symbols. */ |
| 2308 | |
| 2309 | symbolS * |
| 2310 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 2311 | { |
| 2312 | return NULL; |
| 2313 | } |
| 2314 | |
| 2315 | /* Round up a section size to the appropriate boundary. */ |
| 2316 | valueT |
| 2317 | md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size) |
| 2318 | { |
| 2319 | /* Byte alignment is fine */ |
| 2320 | return size; |
| 2321 | } |
| 2322 | |
| 2323 | /* Exactly what point is a PC-relative offset relative TO? |
| 2324 | On the vax, they're relative to the address of the offset, plus |
| 2325 | its size. */ |
| 2326 | long |
| 2327 | md_pcrel_from (fixS *fixP) |
| 2328 | { |
| 2329 | return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address; |
| 2330 | } |
| 2331 | |
| 2332 | arelent * |
| 2333 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) |
| 2334 | { |
| 2335 | arelent *reloc; |
| 2336 | bfd_reloc_code_real_type code; |
| 2337 | |
| 2338 | if (fixp->fx_tcbit) |
| 2339 | abort (); |
| 2340 | |
| 2341 | if (fixp->fx_r_type != BFD_RELOC_NONE) |
| 2342 | { |
| 2343 | code = fixp->fx_r_type; |
| 2344 | |
| 2345 | if (fixp->fx_pcrel) |
| 2346 | { |
| 2347 | switch (code) |
| 2348 | { |
| 2349 | case BFD_RELOC_8_PCREL: |
| 2350 | case BFD_RELOC_16_PCREL: |
| 2351 | case BFD_RELOC_32_PCREL: |
| 2352 | #ifdef OBJ_ELF |
| 2353 | case BFD_RELOC_8_GOT_PCREL: |
| 2354 | case BFD_RELOC_16_GOT_PCREL: |
| 2355 | case BFD_RELOC_32_GOT_PCREL: |
| 2356 | case BFD_RELOC_8_PLT_PCREL: |
| 2357 | case BFD_RELOC_16_PLT_PCREL: |
| 2358 | case BFD_RELOC_32_PLT_PCREL: |
| 2359 | #endif |
| 2360 | break; |
| 2361 | default: |
| 2362 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 2363 | _("Cannot make %s relocation PC relative"), |
| 2364 | bfd_get_reloc_code_name (code)); |
| 2365 | } |
| 2366 | } |
| 2367 | } |
| 2368 | else |
| 2369 | { |
| 2370 | #define F(SZ,PCREL) (((SZ) << 1) + (PCREL)) |
| 2371 | switch (F (fixp->fx_size, fixp->fx_pcrel)) |
| 2372 | { |
| 2373 | #define MAP(SZ,PCREL,TYPE) case F(SZ,PCREL): code = (TYPE); break |
| 2374 | MAP (1, 0, BFD_RELOC_8); |
| 2375 | MAP (2, 0, BFD_RELOC_16); |
| 2376 | MAP (4, 0, BFD_RELOC_32); |
| 2377 | MAP (1, 1, BFD_RELOC_8_PCREL); |
| 2378 | MAP (2, 1, BFD_RELOC_16_PCREL); |
| 2379 | MAP (4, 1, BFD_RELOC_32_PCREL); |
| 2380 | default: |
| 2381 | abort (); |
| 2382 | } |
| 2383 | } |
| 2384 | #undef F |
| 2385 | #undef MAP |
| 2386 | |
| 2387 | reloc = xmalloc (sizeof (arelent)); |
| 2388 | reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); |
| 2389 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 2390 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 2391 | #ifndef OBJ_ELF |
| 2392 | if (fixp->fx_pcrel) |
| 2393 | reloc->addend = fixp->fx_addnumber; |
| 2394 | else |
| 2395 | reloc->addend = 0; |
| 2396 | #else |
| 2397 | reloc->addend = fixp->fx_offset; |
| 2398 | #endif |
| 2399 | |
| 2400 | reloc->howto = bfd_reloc_type_lookup (stdoutput, code); |
| 2401 | gas_assert (reloc->howto != 0); |
| 2402 | |
| 2403 | return reloc; |
| 2404 | } |
| 2405 | |
| 2406 | /* vax:md_assemble() emit frags for 1 instruction given in textual form. */ |
| 2407 | void |
| 2408 | md_assemble (char *instruction_string) |
| 2409 | { |
| 2410 | /* Non-zero if operand expression's segment is not known yet. */ |
| 2411 | int is_undefined; |
| 2412 | /* Non-zero if operand expression's segment is absolute. */ |
| 2413 | int is_absolute; |
| 2414 | int length_code; |
| 2415 | char *p; |
| 2416 | /* An operand. Scans all operands. */ |
| 2417 | struct vop *operandP; |
| 2418 | char *save_input_line_pointer; |
| 2419 | /* What used to live after an expression. */ |
| 2420 | char c_save; |
| 2421 | /* 1: instruction_string bad for all passes. */ |
| 2422 | int goofed; |
| 2423 | /* Points to slot just after last operand. */ |
| 2424 | struct vop *end_operandP; |
| 2425 | /* Points to expression values for this operand. */ |
| 2426 | expressionS *expP; |
| 2427 | segT *segP; |
| 2428 | |
| 2429 | /* These refer to an instruction operand expression. */ |
| 2430 | /* Target segment of the address. */ |
| 2431 | segT to_seg; |
| 2432 | valueT this_add_number; |
| 2433 | /* Positive (minuend) symbol. */ |
| 2434 | symbolS *this_add_symbol; |
| 2435 | /* As a number. */ |
| 2436 | long opcode_as_number; |
| 2437 | /* Least significant byte 1st. */ |
| 2438 | char *opcode_as_chars; |
| 2439 | /* As an array of characters. */ |
| 2440 | /* Least significant byte 1st */ |
| 2441 | char *opcode_low_byteP; |
| 2442 | /* length (bytes) meant by vop_short. */ |
| 2443 | int length; |
| 2444 | /* 0, or 1 if '@' is in addressing mode. */ |
| 2445 | int at; |
| 2446 | /* From vop_nbytes: vax_operand_width (in bytes) */ |
| 2447 | int nbytes; |
| 2448 | FLONUM_TYPE *floatP; |
| 2449 | LITTLENUM_TYPE literal_float[8]; |
| 2450 | /* Big enough for any floating point literal. */ |
| 2451 | |
| 2452 | vip (&v, instruction_string); |
| 2453 | |
| 2454 | /* Now we try to find as many as_warn()s as we can. If we do any as_warn()s |
| 2455 | then goofed=1. Notice that we don't make any frags yet. |
| 2456 | Should goofed be 1, then this instruction will wedge in any pass, |
| 2457 | and we can safely flush it, without causing interpass symbol phase |
| 2458 | errors. That is, without changing label values in different passes. */ |
| 2459 | if ((goofed = (*v.vit_error)) != 0) |
| 2460 | { |
| 2461 | as_fatal (_("Ignoring statement due to \"%s\""), v.vit_error); |
| 2462 | } |
| 2463 | /* We need to use expression() and friends, which require us to diddle |
| 2464 | input_line_pointer. So we save it and restore it later. */ |
| 2465 | save_input_line_pointer = input_line_pointer; |
| 2466 | for (operandP = v.vit_operand, |
| 2467 | expP = exp_of_operand, |
| 2468 | segP = seg_of_operand, |
| 2469 | floatP = float_operand, |
| 2470 | end_operandP = v.vit_operand + v.vit_operands; |
| 2471 | |
| 2472 | operandP < end_operandP; |
| 2473 | |
| 2474 | operandP++, expP++, segP++, floatP++) |
| 2475 | { |
| 2476 | if (operandP->vop_error) |
| 2477 | { |
| 2478 | as_fatal (_("Aborting because statement has \"%s\""), operandP->vop_error); |
| 2479 | goofed = 1; |
| 2480 | } |
| 2481 | else |
| 2482 | { |
| 2483 | /* Statement has no syntax goofs: let's sniff the expression. */ |
| 2484 | int can_be_short = 0; /* 1 if a bignum can be reduced to a short literal. */ |
| 2485 | |
| 2486 | input_line_pointer = operandP->vop_expr_begin; |
| 2487 | c_save = operandP->vop_expr_end[1]; |
| 2488 | operandP->vop_expr_end[1] = '\0'; |
| 2489 | /* If to_seg == SEG_PASS1, expression() will have set need_pass_2 = 1. */ |
| 2490 | *segP = expression (expP); |
| 2491 | switch (expP->X_op) |
| 2492 | { |
| 2493 | case O_absent: |
| 2494 | /* for BSD4.2 compatibility, missing expression is absolute 0 */ |
| 2495 | expP->X_op = O_constant; |
| 2496 | expP->X_add_number = 0; |
| 2497 | /* For SEG_ABSOLUTE, we shouldn't need to set X_op_symbol, |
| 2498 | X_add_symbol to any particular value. But, we will program |
| 2499 | defensively. Since this situation occurs rarely so it costs |
| 2500 | us little to do, and stops Dean worrying about the origin of |
| 2501 | random bits in expressionS's. */ |
| 2502 | expP->X_add_symbol = NULL; |
| 2503 | expP->X_op_symbol = NULL; |
| 2504 | break; |
| 2505 | |
| 2506 | case O_symbol: |
| 2507 | case O_constant: |
| 2508 | break; |
| 2509 | |
| 2510 | default: |
| 2511 | /* Major bug. We can't handle the case of a |
| 2512 | SEG_OP expression in a VIT_OPCODE_SYNTHETIC |
| 2513 | variable-length instruction. |
| 2514 | We don't have a frag type that is smart enough to |
| 2515 | relax a SEG_OP, and so we just force all |
| 2516 | SEG_OPs to behave like SEG_PASS1s. |
| 2517 | Clearly, if there is a demand we can invent a new or |
| 2518 | modified frag type and then coding up a frag for this |
| 2519 | case will be easy. SEG_OP was invented for the |
| 2520 | .words after a CASE opcode, and was never intended for |
| 2521 | instruction operands. */ |
| 2522 | need_pass_2 = 1; |
| 2523 | as_fatal (_("Can't relocate expression")); |
| 2524 | break; |
| 2525 | |
| 2526 | case O_big: |
| 2527 | /* Preserve the bits. */ |
| 2528 | if (expP->X_add_number > 0) |
| 2529 | { |
| 2530 | bignum_copy (generic_bignum, expP->X_add_number, |
| 2531 | floatP->low, SIZE_OF_LARGE_NUMBER); |
| 2532 | } |
| 2533 | else |
| 2534 | { |
| 2535 | know (expP->X_add_number < 0); |
| 2536 | flonum_copy (&generic_floating_point_number, |
| 2537 | floatP); |
| 2538 | if (strchr ("s i", operandP->vop_short)) |
| 2539 | { |
| 2540 | /* Could possibly become S^# */ |
| 2541 | flonum_gen2vax (-expP->X_add_number, floatP, literal_float); |
| 2542 | switch (-expP->X_add_number) |
| 2543 | { |
| 2544 | case 'f': |
| 2545 | can_be_short = |
| 2546 | (literal_float[0] & 0xFC0F) == 0x4000 |
| 2547 | && literal_float[1] == 0; |
| 2548 | break; |
| 2549 | |
| 2550 | case 'd': |
| 2551 | can_be_short = |
| 2552 | (literal_float[0] & 0xFC0F) == 0x4000 |
| 2553 | && literal_float[1] == 0 |
| 2554 | && literal_float[2] == 0 |
| 2555 | && literal_float[3] == 0; |
| 2556 | break; |
| 2557 | |
| 2558 | case 'g': |
| 2559 | can_be_short = |
| 2560 | (literal_float[0] & 0xFF81) == 0x4000 |
| 2561 | && literal_float[1] == 0 |
| 2562 | && literal_float[2] == 0 |
| 2563 | && literal_float[3] == 0; |
| 2564 | break; |
| 2565 | |
| 2566 | case 'h': |
| 2567 | can_be_short = ((literal_float[0] & 0xFFF8) == 0x4000 |
| 2568 | && (literal_float[1] & 0xE000) == 0 |
| 2569 | && literal_float[2] == 0 |
| 2570 | && literal_float[3] == 0 |
| 2571 | && literal_float[4] == 0 |
| 2572 | && literal_float[5] == 0 |
| 2573 | && literal_float[6] == 0 |
| 2574 | && literal_float[7] == 0); |
| 2575 | break; |
| 2576 | |
| 2577 | default: |
| 2578 | BAD_CASE (-expP->X_add_number); |
| 2579 | break; |
| 2580 | } |
| 2581 | } |
| 2582 | } |
| 2583 | |
| 2584 | if (operandP->vop_short == 's' |
| 2585 | || operandP->vop_short == 'i' |
| 2586 | || (operandP->vop_short == ' ' |
| 2587 | && operandP->vop_reg == 0xF |
| 2588 | && (operandP->vop_mode & 0xE) == 0x8)) |
| 2589 | { |
| 2590 | /* Saw a '#'. */ |
| 2591 | if (operandP->vop_short == ' ') |
| 2592 | { |
| 2593 | /* We must chose S^ or I^. */ |
| 2594 | if (expP->X_add_number > 0) |
| 2595 | { |
| 2596 | /* Bignum: Short literal impossible. */ |
| 2597 | operandP->vop_short = 'i'; |
| 2598 | operandP->vop_mode = 8; |
| 2599 | operandP->vop_reg = 0xF; /* VAX PC. */ |
| 2600 | } |
| 2601 | else |
| 2602 | { |
| 2603 | /* Flonum: Try to do it. */ |
| 2604 | if (can_be_short) |
| 2605 | { |
| 2606 | operandP->vop_short = 's'; |
| 2607 | operandP->vop_mode = 0; |
| 2608 | operandP->vop_ndx = -1; |
| 2609 | operandP->vop_reg = -1; |
| 2610 | expP->X_op = O_constant; |
| 2611 | } |
| 2612 | else |
| 2613 | { |
| 2614 | operandP->vop_short = 'i'; |
| 2615 | operandP->vop_mode = 8; |
| 2616 | operandP->vop_reg = 0xF; /* VAX PC */ |
| 2617 | } |
| 2618 | } /* bignum or flonum ? */ |
| 2619 | } /* if #, but no S^ or I^ seen. */ |
| 2620 | /* No more ' ' case: either 's' or 'i'. */ |
| 2621 | if (operandP->vop_short == 's') |
| 2622 | { |
| 2623 | /* Wants to be a short literal. */ |
| 2624 | if (expP->X_add_number > 0) |
| 2625 | { |
| 2626 | as_warn (_("Bignum not permitted in short literal. Immediate mode assumed.")); |
| 2627 | operandP->vop_short = 'i'; |
| 2628 | operandP->vop_mode = 8; |
| 2629 | operandP->vop_reg = 0xF; /* VAX PC. */ |
| 2630 | } |
| 2631 | else |
| 2632 | { |
| 2633 | if (!can_be_short) |
| 2634 | { |
| 2635 | as_warn (_("Can't do flonum short literal: immediate mode used.")); |
| 2636 | operandP->vop_short = 'i'; |
| 2637 | operandP->vop_mode = 8; |
| 2638 | operandP->vop_reg = 0xF; /* VAX PC. */ |
| 2639 | } |
| 2640 | else |
| 2641 | { |
| 2642 | /* Encode short literal now. */ |
| 2643 | int temp = 0; |
| 2644 | |
| 2645 | switch (-expP->X_add_number) |
| 2646 | { |
| 2647 | case 'f': |
| 2648 | case 'd': |
| 2649 | temp = literal_float[0] >> 4; |
| 2650 | break; |
| 2651 | |
| 2652 | case 'g': |
| 2653 | temp = literal_float[0] >> 1; |
| 2654 | break; |
| 2655 | |
| 2656 | case 'h': |
| 2657 | temp = ((literal_float[0] << 3) & 070) |
| 2658 | | ((literal_float[1] >> 13) & 07); |
| 2659 | break; |
| 2660 | |
| 2661 | default: |
| 2662 | BAD_CASE (-expP->X_add_number); |
| 2663 | break; |
| 2664 | } |
| 2665 | |
| 2666 | floatP->low[0] = temp & 077; |
| 2667 | floatP->low[1] = 0; |
| 2668 | } |
| 2669 | } |
| 2670 | } |
| 2671 | else |
| 2672 | { |
| 2673 | /* I^# seen: set it up if float. */ |
| 2674 | if (expP->X_add_number < 0) |
| 2675 | { |
| 2676 | memcpy (floatP->low, literal_float, sizeof (literal_float)); |
| 2677 | } |
| 2678 | } /* if S^# seen. */ |
| 2679 | } |
| 2680 | else |
| 2681 | { |
| 2682 | as_warn (_("A bignum/flonum may not be a displacement: 0x%lx used"), |
| 2683 | (expP->X_add_number = 0x80000000L)); |
| 2684 | /* Chosen so luser gets the most offset bits to patch later. */ |
| 2685 | } |
| 2686 | expP->X_add_number = floatP->low[0] |
| 2687 | | ((LITTLENUM_MASK & (floatP->low[1])) << LITTLENUM_NUMBER_OF_BITS); |
| 2688 | |
| 2689 | /* For the O_big case we have: |
| 2690 | If vop_short == 's' then a short floating literal is in the |
| 2691 | lowest 6 bits of floatP -> low [0], which is |
| 2692 | big_operand_bits [---] [0]. |
| 2693 | If vop_short == 'i' then the appropriate number of elements |
| 2694 | of big_operand_bits [---] [...] are set up with the correct |
| 2695 | bits. |
| 2696 | Also, just in case width is byte word or long, we copy the lowest |
| 2697 | 32 bits of the number to X_add_number. */ |
| 2698 | break; |
| 2699 | } |
| 2700 | if (input_line_pointer != operandP->vop_expr_end + 1) |
| 2701 | { |
| 2702 | as_fatal ("Junk at end of expression \"%s\"", input_line_pointer); |
| 2703 | goofed = 1; |
| 2704 | } |
| 2705 | operandP->vop_expr_end[1] = c_save; |
| 2706 | } |
| 2707 | } |
| 2708 | |
| 2709 | input_line_pointer = save_input_line_pointer; |
| 2710 | |
| 2711 | if (need_pass_2 || goofed) |
| 2712 | return; |
| 2713 | |
| 2714 | dwarf2_emit_insn (0); |
| 2715 | /* Emit op-code. */ |
| 2716 | /* Remember where it is, in case we want to modify the op-code later. */ |
| 2717 | opcode_low_byteP = frag_more (v.vit_opcode_nbytes); |
| 2718 | memcpy (opcode_low_byteP, v.vit_opcode, v.vit_opcode_nbytes); |
| 2719 | opcode_as_chars = v.vit_opcode; |
| 2720 | opcode_as_number = md_chars_to_number ((unsigned char *) opcode_as_chars, 4); |
| 2721 | for (operandP = v.vit_operand, |
| 2722 | expP = exp_of_operand, |
| 2723 | segP = seg_of_operand, |
| 2724 | floatP = float_operand, |
| 2725 | end_operandP = v.vit_operand + v.vit_operands; |
| 2726 | |
| 2727 | operandP < end_operandP; |
| 2728 | |
| 2729 | operandP++, |
| 2730 | floatP++, |
| 2731 | segP++, |
| 2732 | expP++) |
| 2733 | { |
| 2734 | if (operandP->vop_ndx >= 0) |
| 2735 | { |
| 2736 | /* Indexed addressing byte. */ |
| 2737 | /* Legality of indexed mode already checked: it is OK. */ |
| 2738 | FRAG_APPEND_1_CHAR (0x40 + operandP->vop_ndx); |
| 2739 | } /* if(vop_ndx>=0) */ |
| 2740 | |
| 2741 | /* Here to make main operand frag(s). */ |
| 2742 | this_add_number = expP->X_add_number; |
| 2743 | this_add_symbol = expP->X_add_symbol; |
| 2744 | to_seg = *segP; |
| 2745 | is_undefined = (to_seg == undefined_section); |
| 2746 | is_absolute = (to_seg == absolute_section); |
| 2747 | at = operandP->vop_mode & 1; |
| 2748 | length = (operandP->vop_short == 'b' |
| 2749 | ? 1 : (operandP->vop_short == 'w' |
| 2750 | ? 2 : (operandP->vop_short == 'l' |
| 2751 | ? 4 : 0))); |
| 2752 | nbytes = operandP->vop_nbytes; |
| 2753 | if (operandP->vop_access == 'b') |
| 2754 | { |
| 2755 | if (to_seg == now_seg || is_undefined) |
| 2756 | { |
| 2757 | /* If is_undefined, then it might BECOME now_seg. */ |
| 2758 | if (nbytes) |
| 2759 | { |
| 2760 | p = frag_more (nbytes); |
| 2761 | fix_new (frag_now, p - frag_now->fr_literal, nbytes, |
| 2762 | this_add_symbol, this_add_number, 1, NO_RELOC); |
| 2763 | } |
| 2764 | else |
| 2765 | { |
| 2766 | /* to_seg==now_seg || to_seg == SEG_UNKNOWN */ |
| 2767 | /* nbytes==0 */ |
| 2768 | length_code = is_undefined ? STATE_UNDF : STATE_BYTE; |
| 2769 | if (opcode_as_number & VIT_OPCODE_SPECIAL) |
| 2770 | { |
| 2771 | if (operandP->vop_width == VAX_WIDTH_UNCONDITIONAL_JUMP) |
| 2772 | { |
| 2773 | /* br or jsb */ |
| 2774 | frag_var (rs_machine_dependent, 5, 1, |
| 2775 | ENCODE_RELAX (STATE_ALWAYS_BRANCH, length_code), |
| 2776 | this_add_symbol, this_add_number, |
| 2777 | opcode_low_byteP); |
| 2778 | } |
| 2779 | else |
| 2780 | { |
| 2781 | if (operandP->vop_width == VAX_WIDTH_WORD_JUMP) |
| 2782 | { |
| 2783 | length_code = STATE_WORD; |
| 2784 | /* JF: There is no state_byte for this one! */ |
| 2785 | frag_var (rs_machine_dependent, 10, 2, |
| 2786 | ENCODE_RELAX (STATE_COMPLEX_BRANCH, length_code), |
| 2787 | this_add_symbol, this_add_number, |
| 2788 | opcode_low_byteP); |
| 2789 | } |
| 2790 | else |
| 2791 | { |
| 2792 | know (operandP->vop_width == VAX_WIDTH_BYTE_JUMP); |
| 2793 | frag_var (rs_machine_dependent, 9, 1, |
| 2794 | ENCODE_RELAX (STATE_COMPLEX_HOP, length_code), |
| 2795 | this_add_symbol, this_add_number, |
| 2796 | opcode_low_byteP); |
| 2797 | } |
| 2798 | } |
| 2799 | } |
| 2800 | else |
| 2801 | { |
| 2802 | know (operandP->vop_width == VAX_WIDTH_CONDITIONAL_JUMP); |
| 2803 | frag_var (rs_machine_dependent, 7, 1, |
| 2804 | ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, length_code), |
| 2805 | this_add_symbol, this_add_number, |
| 2806 | opcode_low_byteP); |
| 2807 | } |
| 2808 | } |
| 2809 | } |
| 2810 | else |
| 2811 | { |
| 2812 | /* to_seg != now_seg && to_seg != SEG_UNKNOWN */ |
| 2813 | /* --- SEG FLOAT MAY APPEAR HERE --- */ |
| 2814 | if (is_absolute) |
| 2815 | { |
| 2816 | if (nbytes) |
| 2817 | { |
| 2818 | know (!(opcode_as_number & VIT_OPCODE_SYNTHETIC)); |
| 2819 | p = frag_more (nbytes); |
| 2820 | /* Conventional relocation. */ |
| 2821 | fix_new (frag_now, p - frag_now->fr_literal, nbytes, |
| 2822 | section_symbol (absolute_section), |
| 2823 | this_add_number, 1, NO_RELOC); |
| 2824 | } |
| 2825 | else |
| 2826 | { |
| 2827 | know (opcode_as_number & VIT_OPCODE_SYNTHETIC); |
| 2828 | if (opcode_as_number & VIT_OPCODE_SPECIAL) |
| 2829 | { |
| 2830 | if (operandP->vop_width == VAX_WIDTH_UNCONDITIONAL_JUMP) |
| 2831 | { |
| 2832 | /* br or jsb */ |
| 2833 | *opcode_low_byteP = opcode_as_chars[0] + VAX_WIDEN_LONG; |
| 2834 | know (opcode_as_chars[1] == 0); |
| 2835 | p = frag_more (5); |
| 2836 | p[0] = VAX_ABSOLUTE_MODE; /* @#... */ |
| 2837 | md_number_to_chars (p + 1, this_add_number, 4); |
| 2838 | /* Now (eg) JMP @#foo or JSB @#foo. */ |
| 2839 | } |
| 2840 | else |
| 2841 | { |
| 2842 | if (operandP->vop_width == VAX_WIDTH_WORD_JUMP) |
| 2843 | { |
| 2844 | p = frag_more (10); |
| 2845 | p[0] = 2; |
| 2846 | p[1] = 0; |
| 2847 | p[2] = VAX_BRB; |
| 2848 | p[3] = 6; |
| 2849 | p[4] = VAX_JMP; |
| 2850 | p[5] = VAX_ABSOLUTE_MODE; /* @#... */ |
| 2851 | md_number_to_chars (p + 6, this_add_number, 4); |
| 2852 | /* Now (eg) ACBx 1f |
| 2853 | BRB 2f |
| 2854 | 1: JMP @#foo |
| 2855 | 2: */ |
| 2856 | } |
| 2857 | else |
| 2858 | { |
| 2859 | know (operandP->vop_width == VAX_WIDTH_BYTE_JUMP); |
| 2860 | p = frag_more (9); |
| 2861 | p[0] = 2; |
| 2862 | p[1] = VAX_BRB; |
| 2863 | p[2] = 6; |
| 2864 | p[3] = VAX_JMP; |
| 2865 | p[4] = VAX_ABSOLUTE_MODE; /* @#... */ |
| 2866 | md_number_to_chars (p + 5, this_add_number, 4); |
| 2867 | /* Now (eg) xOBxxx 1f |
| 2868 | BRB 2f |
| 2869 | 1: JMP @#foo |
| 2870 | 2: */ |
| 2871 | } |
| 2872 | } |
| 2873 | } |
| 2874 | else |
| 2875 | { |
| 2876 | /* b<cond> */ |
| 2877 | *opcode_low_byteP ^= 1; |
| 2878 | /* To reverse the condition in a VAX branch, |
| 2879 | complement the lowest order bit. */ |
| 2880 | p = frag_more (7); |
| 2881 | p[0] = 6; |
| 2882 | p[1] = VAX_JMP; |
| 2883 | p[2] = VAX_ABSOLUTE_MODE; /* @#... */ |
| 2884 | md_number_to_chars (p + 3, this_add_number, 4); |
| 2885 | /* Now (eg) BLEQ 1f |
| 2886 | JMP @#foo |
| 2887 | 1: */ |
| 2888 | } |
| 2889 | } |
| 2890 | } |
| 2891 | else |
| 2892 | { |
| 2893 | /* to_seg != now_seg && !is_undefinfed && !is_absolute */ |
| 2894 | if (nbytes > 0) |
| 2895 | { |
| 2896 | /* Pc-relative. Conventional relocation. */ |
| 2897 | know (!(opcode_as_number & VIT_OPCODE_SYNTHETIC)); |
| 2898 | p = frag_more (nbytes); |
| 2899 | fix_new (frag_now, p - frag_now->fr_literal, nbytes, |
| 2900 | section_symbol (absolute_section), |
| 2901 | this_add_number, 1, NO_RELOC); |
| 2902 | } |
| 2903 | else |
| 2904 | { |
| 2905 | know (opcode_as_number & VIT_OPCODE_SYNTHETIC); |
| 2906 | if (opcode_as_number & VIT_OPCODE_SPECIAL) |
| 2907 | { |
| 2908 | if (operandP->vop_width == VAX_WIDTH_UNCONDITIONAL_JUMP) |
| 2909 | { |
| 2910 | /* br or jsb */ |
| 2911 | know (opcode_as_chars[1] == 0); |
| 2912 | *opcode_low_byteP = opcode_as_chars[0] + VAX_WIDEN_LONG; |
| 2913 | p = frag_more (5); |
| 2914 | p[0] = VAX_PC_RELATIVE_MODE; |
| 2915 | fix_new (frag_now, |
| 2916 | p + 1 - frag_now->fr_literal, 4, |
| 2917 | this_add_symbol, |
| 2918 | this_add_number, 1, NO_RELOC); |
| 2919 | /* Now eg JMP foo or JSB foo. */ |
| 2920 | } |
| 2921 | else |
| 2922 | { |
| 2923 | if (operandP->vop_width == VAX_WIDTH_WORD_JUMP) |
| 2924 | { |
| 2925 | p = frag_more (10); |
| 2926 | p[0] = 0; |
| 2927 | p[1] = 2; |
| 2928 | p[2] = VAX_BRB; |
| 2929 | p[3] = 6; |
| 2930 | p[4] = VAX_JMP; |
| 2931 | p[5] = VAX_PC_RELATIVE_MODE; |
| 2932 | fix_new (frag_now, |
| 2933 | p + 6 - frag_now->fr_literal, 4, |
| 2934 | this_add_symbol, |
| 2935 | this_add_number, 1, NO_RELOC); |
| 2936 | /* Now (eg) ACBx 1f |
| 2937 | BRB 2f |
| 2938 | 1: JMP foo |
| 2939 | 2: */ |
| 2940 | } |
| 2941 | else |
| 2942 | { |
| 2943 | know (operandP->vop_width == VAX_WIDTH_BYTE_JUMP); |
| 2944 | p = frag_more (10); |
| 2945 | p[0] = 2; |
| 2946 | p[1] = VAX_BRB; |
| 2947 | p[2] = 6; |
| 2948 | p[3] = VAX_JMP; |
| 2949 | p[4] = VAX_PC_RELATIVE_MODE; |
| 2950 | fix_new (frag_now, |
| 2951 | p + 5 - frag_now->fr_literal, |
| 2952 | 4, this_add_symbol, |
| 2953 | this_add_number, 1, NO_RELOC); |
| 2954 | /* Now (eg) xOBxxx 1f |
| 2955 | BRB 2f |
| 2956 | 1: JMP foo |
| 2957 | 2: */ |
| 2958 | } |
| 2959 | } |
| 2960 | } |
| 2961 | else |
| 2962 | { |
| 2963 | know (operandP->vop_width == VAX_WIDTH_CONDITIONAL_JUMP); |
| 2964 | *opcode_low_byteP ^= 1; /* Reverse branch condition. */ |
| 2965 | p = frag_more (7); |
| 2966 | p[0] = 6; |
| 2967 | p[1] = VAX_JMP; |
| 2968 | p[2] = VAX_PC_RELATIVE_MODE; |
| 2969 | fix_new (frag_now, p + 3 - frag_now->fr_literal, |
| 2970 | 4, this_add_symbol, |
| 2971 | this_add_number, 1, NO_RELOC); |
| 2972 | } |
| 2973 | } |
| 2974 | } |
| 2975 | } |
| 2976 | } |
| 2977 | else |
| 2978 | { |
| 2979 | /* So it is ordinary operand. */ |
| 2980 | know (operandP->vop_access != 'b'); |
| 2981 | /* ' ' target-independent: elsewhere. */ |
| 2982 | know (operandP->vop_access != ' '); |
| 2983 | know (operandP->vop_access == 'a' |
| 2984 | || operandP->vop_access == 'm' |
| 2985 | || operandP->vop_access == 'r' |
| 2986 | || operandP->vop_access == 'v' |
| 2987 | || operandP->vop_access == 'w'); |
| 2988 | if (operandP->vop_short == 's') |
| 2989 | { |
| 2990 | if (is_absolute) |
| 2991 | { |
| 2992 | if (this_add_number >= 64) |
| 2993 | { |
| 2994 | as_warn (_("Short literal overflow(%ld.), immediate mode assumed."), |
| 2995 | (long) this_add_number); |
| 2996 | operandP->vop_short = 'i'; |
| 2997 | operandP->vop_mode = 8; |
| 2998 | operandP->vop_reg = 0xF; |
| 2999 | } |
| 3000 | } |
| 3001 | else |
| 3002 | { |
| 3003 | as_warn (_("Forced short literal to immediate mode. now_seg=%s to_seg=%s"), |
| 3004 | segment_name (now_seg), segment_name (to_seg)); |
| 3005 | operandP->vop_short = 'i'; |
| 3006 | operandP->vop_mode = 8; |
| 3007 | operandP->vop_reg = 0xF; |
| 3008 | } |
| 3009 | } |
| 3010 | if (operandP->vop_reg >= 0 && (operandP->vop_mode < 8 |
| 3011 | || (operandP->vop_reg != 0xF && operandP->vop_mode < 10))) |
| 3012 | { |
| 3013 | /* One byte operand. */ |
| 3014 | know (operandP->vop_mode > 3); |
| 3015 | FRAG_APPEND_1_CHAR (operandP->vop_mode << 4 | operandP->vop_reg); |
| 3016 | /* All 1-bytes except S^# happen here. */ |
| 3017 | } |
| 3018 | else |
| 3019 | { |
| 3020 | /* {@}{q^}foo{(Rn)} or S^#foo */ |
| 3021 | if (operandP->vop_reg == -1 && operandP->vop_short != 's') |
| 3022 | { |
| 3023 | /* "{@}{q^}foo" */ |
| 3024 | if (to_seg == now_seg) |
| 3025 | { |
| 3026 | if (length == 0) |
| 3027 | { |
| 3028 | know (operandP->vop_short == ' '); |
| 3029 | length_code = STATE_BYTE; |
| 3030 | #ifdef OBJ_ELF |
| 3031 | if (S_IS_EXTERNAL (this_add_symbol) |
| 3032 | || S_IS_WEAK (this_add_symbol)) |
| 3033 | length_code = STATE_UNDF; |
| 3034 | #endif |
| 3035 | p = frag_var (rs_machine_dependent, 10, 2, |
| 3036 | ENCODE_RELAX (STATE_PC_RELATIVE, length_code), |
| 3037 | this_add_symbol, this_add_number, |
| 3038 | opcode_low_byteP); |
| 3039 | know (operandP->vop_mode == 10 + at); |
| 3040 | *p = at << 4; |
| 3041 | /* At is the only context we need to carry |
| 3042 | to other side of relax() process. Must |
| 3043 | be in the correct bit position of VAX |
| 3044 | operand spec. byte. */ |
| 3045 | } |
| 3046 | else |
| 3047 | { |
| 3048 | know (length); |
| 3049 | know (operandP->vop_short != ' '); |
| 3050 | p = frag_more (length + 1); |
| 3051 | p[0] = 0xF | ((at + "?\12\14?\16"[length]) << 4); |
| 3052 | fix_new (frag_now, p + 1 - frag_now->fr_literal, |
| 3053 | length, this_add_symbol, |
| 3054 | this_add_number, 1, NO_RELOC); |
| 3055 | } |
| 3056 | } |
| 3057 | else |
| 3058 | { |
| 3059 | /* to_seg != now_seg */ |
| 3060 | if (this_add_symbol == NULL) |
| 3061 | { |
| 3062 | know (is_absolute); |
| 3063 | /* Do @#foo: simpler relocation than foo-.(pc) anyway. */ |
| 3064 | p = frag_more (5); |
| 3065 | p[0] = VAX_ABSOLUTE_MODE; /* @#... */ |
| 3066 | md_number_to_chars (p + 1, this_add_number, 4); |
| 3067 | if (length && length != 4) |
| 3068 | as_warn (_("Length specification ignored. Address mode 9F used")); |
| 3069 | } |
| 3070 | else |
| 3071 | { |
| 3072 | /* {@}{q^}other_seg */ |
| 3073 | know ((length == 0 && operandP->vop_short == ' ') |
| 3074 | || (length > 0 && operandP->vop_short != ' ')); |
| 3075 | if (is_undefined |
| 3076 | #ifdef OBJ_ELF |
| 3077 | || S_IS_WEAK(this_add_symbol) |
| 3078 | || S_IS_EXTERNAL(this_add_symbol) |
| 3079 | #endif |
| 3080 | ) |
| 3081 | { |
| 3082 | switch (length) |
| 3083 | { |
| 3084 | default: length_code = STATE_UNDF; break; |
| 3085 | case 1: length_code = STATE_BYTE; break; |
| 3086 | case 2: length_code = STATE_WORD; break; |
| 3087 | case 4: length_code = STATE_LONG; break; |
| 3088 | } |
| 3089 | /* We have a SEG_UNKNOWN symbol. It might |
| 3090 | turn out to be in the same segment as |
| 3091 | the instruction, permitting relaxation. */ |
| 3092 | p = frag_var (rs_machine_dependent, 5, 2, |
| 3093 | ENCODE_RELAX (STATE_PC_RELATIVE, length_code), |
| 3094 | this_add_symbol, this_add_number, |
| 3095 | opcode_low_byteP); |
| 3096 | p[0] = at << 4; |
| 3097 | } |
| 3098 | else |
| 3099 | { |
| 3100 | if (length == 0) |
| 3101 | { |
| 3102 | know (operandP->vop_short == ' '); |
| 3103 | length = 4; /* Longest possible. */ |
| 3104 | } |
| 3105 | p = frag_more (length + 1); |
| 3106 | p[0] = 0xF | ((at + "?\12\14?\16"[length]) << 4); |
| 3107 | md_number_to_chars (p + 1, this_add_number, length); |
| 3108 | fix_new (frag_now, |
| 3109 | p + 1 - frag_now->fr_literal, |
| 3110 | length, this_add_symbol, |
| 3111 | this_add_number, 1, NO_RELOC); |
| 3112 | } |
| 3113 | } |
| 3114 | } |
| 3115 | } |
| 3116 | else |
| 3117 | { |
| 3118 | /* {@}{q^}foo(Rn) or S^# or I^# or # */ |
| 3119 | if (operandP->vop_mode < 0xA) |
| 3120 | { |
| 3121 | /* # or S^# or I^# */ |
| 3122 | if (operandP->vop_access == 'v' |
| 3123 | || operandP->vop_access == 'a') |
| 3124 | { |
| 3125 | if (operandP->vop_access == 'v') |
| 3126 | as_warn (_("Invalid operand: immediate value used as base address.")); |
| 3127 | else |
| 3128 | as_warn (_("Invalid operand: immediate value used as address.")); |
| 3129 | /* gcc 2.6.3 is known to generate these in at least |
| 3130 | one case. */ |
| 3131 | } |
| 3132 | if (length == 0 |
| 3133 | && is_absolute && (expP->X_op != O_big) |
| 3134 | && operandP->vop_mode == 8 /* No '@'. */ |
| 3135 | && this_add_number < 64) |
| 3136 | { |
| 3137 | operandP->vop_short = 's'; |
| 3138 | } |
| 3139 | if (operandP->vop_short == 's') |
| 3140 | { |
| 3141 | FRAG_APPEND_1_CHAR (this_add_number); |
| 3142 | } |
| 3143 | else |
| 3144 | { |
| 3145 | /* I^#... */ |
| 3146 | know (nbytes); |
| 3147 | p = frag_more (nbytes + 1); |
| 3148 | know (operandP->vop_reg == 0xF); |
| 3149 | #ifdef OBJ_ELF |
| 3150 | if (flag_want_pic && operandP->vop_mode == 8 |
| 3151 | && this_add_symbol != NULL) |
| 3152 | { |
| 3153 | as_warn (_("Symbol %s used as immediate operand in PIC mode."), |
| 3154 | S_GET_NAME (this_add_symbol)); |
| 3155 | } |
| 3156 | #endif |
| 3157 | p[0] = (operandP->vop_mode << 4) | 0xF; |
| 3158 | if ((is_absolute) && (expP->X_op != O_big)) |
| 3159 | { |
| 3160 | /* If nbytes > 4, then we are scrod. We |
| 3161 | don't know if the high order bytes |
| 3162 | are to be 0xFF or 0x00. BSD4.2 & RMS |
| 3163 | say use 0x00. OK --- but this |
| 3164 | assembler needs ANOTHER rewrite to |
| 3165 | cope properly with this bug. */ |
| 3166 | md_number_to_chars (p + 1, this_add_number, |
| 3167 | min (sizeof (valueT), |
| 3168 | (size_t) nbytes)); |
| 3169 | if ((size_t) nbytes > sizeof (valueT)) |
| 3170 | memset (p + 1 + sizeof (valueT), |
| 3171 | '\0', nbytes - sizeof (valueT)); |
| 3172 | } |
| 3173 | else |
| 3174 | { |
| 3175 | if (expP->X_op == O_big) |
| 3176 | { |
| 3177 | /* Problem here is to get the bytes |
| 3178 | in the right order. We stored |
| 3179 | our constant as LITTLENUMs, not |
| 3180 | bytes. */ |
| 3181 | LITTLENUM_TYPE *lP; |
| 3182 | |
| 3183 | lP = floatP->low; |
| 3184 | if (nbytes & 1) |
| 3185 | { |
| 3186 | know (nbytes == 1); |
| 3187 | p[1] = *lP; |
| 3188 | } |
| 3189 | else |
| 3190 | { |
| 3191 | for (p++; nbytes; nbytes -= 2, p += 2, lP++) |
| 3192 | md_number_to_chars (p, *lP, 2); |
| 3193 | } |
| 3194 | } |
| 3195 | else |
| 3196 | { |
| 3197 | fix_new (frag_now, p + 1 - frag_now->fr_literal, |
| 3198 | nbytes, this_add_symbol, |
| 3199 | this_add_number, 0, NO_RELOC); |
| 3200 | } |
| 3201 | } |
| 3202 | } |
| 3203 | } |
| 3204 | else |
| 3205 | { |
| 3206 | /* {@}{q^}foo(Rn) */ |
| 3207 | know ((length == 0 && operandP->vop_short == ' ') |
| 3208 | || (length > 0 && operandP->vop_short != ' ')); |
| 3209 | if (length == 0) |
| 3210 | { |
| 3211 | if (is_absolute) |
| 3212 | { |
| 3213 | long test; |
| 3214 | |
| 3215 | test = this_add_number; |
| 3216 | |
| 3217 | if (test < 0) |
| 3218 | test = ~test; |
| 3219 | |
| 3220 | length = test & 0xffff8000 ? 4 |
| 3221 | : test & 0xffffff80 ? 2 |
| 3222 | : 1; |
| 3223 | } |
| 3224 | else |
| 3225 | { |
| 3226 | length = 4; |
| 3227 | } |
| 3228 | } |
| 3229 | p = frag_more (1 + length); |
| 3230 | know (operandP->vop_reg >= 0); |
| 3231 | p[0] = operandP->vop_reg |
| 3232 | | ((at | "?\12\14?\16"[length]) << 4); |
| 3233 | if (is_absolute) |
| 3234 | { |
| 3235 | md_number_to_chars (p + 1, this_add_number, length); |
| 3236 | } |
| 3237 | else |
| 3238 | { |
| 3239 | fix_new (frag_now, p + 1 - frag_now->fr_literal, |
| 3240 | length, this_add_symbol, |
| 3241 | this_add_number, 0, NO_RELOC); |
| 3242 | } |
| 3243 | } |
| 3244 | } |
| 3245 | } |
| 3246 | } |
| 3247 | } |
| 3248 | } |
| 3249 | |
| 3250 | void |
| 3251 | md_begin (void) |
| 3252 | { |
| 3253 | const char *errtxt; |
| 3254 | FLONUM_TYPE *fP; |
| 3255 | int i; |
| 3256 | |
| 3257 | if ((errtxt = vip_begin (1, "$", "*", "`")) != 0) |
| 3258 | as_fatal (_("VIP_BEGIN error:%s"), errtxt); |
| 3259 | |
| 3260 | for (i = 0, fP = float_operand; |
| 3261 | fP < float_operand + VIT_MAX_OPERANDS; |
| 3262 | i++, fP++) |
| 3263 | { |
| 3264 | fP->low = &big_operand_bits[i][0]; |
| 3265 | fP->high = &big_operand_bits[i][SIZE_OF_LARGE_NUMBER - 1]; |
| 3266 | } |
| 3267 | } |
| 3268 | |
| 3269 | static char *vax_cons_special_reloc; |
| 3270 | |
| 3271 | void |
| 3272 | vax_cons (expressionS *exp, int size) |
| 3273 | { |
| 3274 | char *save; |
| 3275 | |
| 3276 | SKIP_WHITESPACE (); |
| 3277 | vax_cons_special_reloc = NULL; |
| 3278 | save = input_line_pointer; |
| 3279 | if (input_line_pointer[0] == '%') |
| 3280 | { |
| 3281 | if (strncmp (input_line_pointer + 1, "pcrel", 5) == 0) |
| 3282 | { |
| 3283 | input_line_pointer += 6; |
| 3284 | vax_cons_special_reloc = "pcrel"; |
| 3285 | } |
| 3286 | if (vax_cons_special_reloc) |
| 3287 | { |
| 3288 | int bad = 0; |
| 3289 | |
| 3290 | switch (size) |
| 3291 | { |
| 3292 | case 1: |
| 3293 | if (*input_line_pointer != '8') |
| 3294 | bad = 1; |
| 3295 | input_line_pointer--; |
| 3296 | break; |
| 3297 | case 2: |
| 3298 | if (input_line_pointer[0] != '1' || input_line_pointer[1] != '6') |
| 3299 | bad = 1; |
| 3300 | break; |
| 3301 | case 4: |
| 3302 | if (input_line_pointer[0] != '3' || input_line_pointer[1] != '2') |
| 3303 | bad = 1; |
| 3304 | break; |
| 3305 | default: |
| 3306 | bad = 1; |
| 3307 | break; |
| 3308 | } |
| 3309 | |
| 3310 | if (bad) |
| 3311 | { |
| 3312 | as_bad (_("Illegal operands: Only %%r_%s%d allowed in %d-byte data fields"), |
| 3313 | vax_cons_special_reloc, size * 8, size); |
| 3314 | } |
| 3315 | else |
| 3316 | { |
| 3317 | input_line_pointer += 2; |
| 3318 | if (*input_line_pointer != '(') |
| 3319 | { |
| 3320 | as_bad (_("Illegal operands: %%r_%s%d requires arguments in ()"), |
| 3321 | vax_cons_special_reloc, size * 8); |
| 3322 | bad = 1; |
| 3323 | } |
| 3324 | } |
| 3325 | |
| 3326 | if (bad) |
| 3327 | { |
| 3328 | input_line_pointer = save; |
| 3329 | vax_cons_special_reloc = NULL; |
| 3330 | } |
| 3331 | else |
| 3332 | { |
| 3333 | int c; |
| 3334 | char *end = ++input_line_pointer; |
| 3335 | int npar = 0; |
| 3336 | |
| 3337 | while (! is_end_of_line[(c = *end)]) |
| 3338 | { |
| 3339 | if (c == '(') |
| 3340 | npar++; |
| 3341 | else if (c == ')') |
| 3342 | { |
| 3343 | if (!npar) |
| 3344 | break; |
| 3345 | npar--; |
| 3346 | } |
| 3347 | end++; |
| 3348 | } |
| 3349 | |
| 3350 | if (c != ')') |
| 3351 | as_bad (_("Illegal operands: %%r_%s%d requires arguments in ()"), |
| 3352 | vax_cons_special_reloc, size * 8); |
| 3353 | else |
| 3354 | { |
| 3355 | *end = '\0'; |
| 3356 | expression (exp); |
| 3357 | *end = c; |
| 3358 | if (input_line_pointer != end) |
| 3359 | { |
| 3360 | as_bad (_("Illegal operands: %%r_%s%d requires arguments in ()"), |
| 3361 | vax_cons_special_reloc, size * 8); |
| 3362 | } |
| 3363 | else |
| 3364 | { |
| 3365 | input_line_pointer++; |
| 3366 | SKIP_WHITESPACE (); |
| 3367 | c = *input_line_pointer; |
| 3368 | if (! is_end_of_line[c] && c != ',') |
| 3369 | as_bad (_("Illegal operands: garbage after %%r_%s%d()"), |
| 3370 | vax_cons_special_reloc, size * 8); |
| 3371 | } |
| 3372 | } |
| 3373 | } |
| 3374 | } |
| 3375 | } |
| 3376 | if (vax_cons_special_reloc == NULL) |
| 3377 | expression (exp); |
| 3378 | } |
| 3379 | |
| 3380 | /* This is called by emit_expr via TC_CONS_FIX_NEW when creating a |
| 3381 | reloc for a cons. */ |
| 3382 | |
| 3383 | void |
| 3384 | vax_cons_fix_new (fragS *frag, int where, unsigned int nbytes, expressionS *exp) |
| 3385 | { |
| 3386 | bfd_reloc_code_real_type r; |
| 3387 | |
| 3388 | r = (nbytes == 1 ? BFD_RELOC_8 : |
| 3389 | (nbytes == 2 ? BFD_RELOC_16 : BFD_RELOC_32)); |
| 3390 | |
| 3391 | if (vax_cons_special_reloc) |
| 3392 | { |
| 3393 | if (*vax_cons_special_reloc == 'p') |
| 3394 | { |
| 3395 | switch (nbytes) |
| 3396 | { |
| 3397 | case 1: r = BFD_RELOC_8_PCREL; break; |
| 3398 | case 2: r = BFD_RELOC_16_PCREL; break; |
| 3399 | case 4: r = BFD_RELOC_32_PCREL; break; |
| 3400 | default: abort (); |
| 3401 | } |
| 3402 | } |
| 3403 | } |
| 3404 | |
| 3405 | fix_new_exp (frag, where, (int) nbytes, exp, 0, r); |
| 3406 | vax_cons_special_reloc = NULL; |
| 3407 | } |
| 3408 | |
| 3409 | char * |
| 3410 | md_atof (int type, char * litP, int * sizeP) |
| 3411 | { |
| 3412 | return vax_md_atof (type, litP, sizeP); |
| 3413 | } |