| 1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California |
| 3 | */ |
| 4 | #ifndef lint |
| 5 | static char sccsid[] = "@(#)asparse.c 4.17 %G%"; |
| 6 | #endif not lint |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include "as.h" |
| 10 | #include "asscan.h" |
| 11 | #include "assyms.h" |
| 12 | #include "asexpr.h" |
| 13 | |
| 14 | int lgensym[10]; |
| 15 | char genref[10]; |
| 16 | |
| 17 | long bitfield; |
| 18 | int bitoff; |
| 19 | int curlen; /* current length of literals */ |
| 20 | |
| 21 | /* |
| 22 | * The following three variables are communication between various |
| 23 | * modules to special case a number of things. They are properly |
| 24 | * categorized as hacks. |
| 25 | */ |
| 26 | extern struct symtab *lastnam;/*last name seen by the lexical analyzer*/ |
| 27 | int exprisname; /*last factor in an expression was a name*/ |
| 28 | int droppedLP; /*one is analyzing an expression beginning with*/ |
| 29 | /*a left parenthesis, which has already been*/ |
| 30 | /*shifted. (Used to parse (<expr>)(rn)*/ |
| 31 | |
| 32 | char yytext[NCPName+2]; /*the lexical image*/ |
| 33 | int yylval; /*the lexical value; sloppy typing*/ |
| 34 | struct Opcode yyopcode; /* lexical value for an opcode */ |
| 35 | Bignum yybignum; /* lexical value for a big number */ |
| 36 | /* |
| 37 | * Expression and argument managers |
| 38 | */ |
| 39 | struct exp *xp; /*next free expression slot, used by expr.c*/ |
| 40 | struct exp explist[NEXP]; /*max of 20 expressions in one opcode*/ |
| 41 | struct arg arglist[NARG]; /*building up operands in instructions*/ |
| 42 | /* |
| 43 | * Sets to accelerate token discrimination |
| 44 | */ |
| 45 | char tokensets[(LASTTOKEN) - (FIRSTTOKEN) + 1]; |
| 46 | |
| 47 | static char UDotsname[64]; /*name of the assembly source*/ |
| 48 | |
| 49 | yyparse() |
| 50 | { |
| 51 | reg struct exp *locxp; |
| 52 | /* |
| 53 | * loc1xp and ptrloc1xp are used in the |
| 54 | * expression lookahead |
| 55 | */ |
| 56 | struct exp *loc1xp; /*must be non register*/ |
| 57 | struct exp **ptrloc1xp = & loc1xp; |
| 58 | struct exp *pval; /*hacking expr:expr*/ |
| 59 | |
| 60 | reg struct symtab *np; |
| 61 | reg int argcnt; |
| 62 | |
| 63 | reg inttoktype val; /*what yylex gives*/ |
| 64 | reg inttoktype auxval; /*saves val*/ |
| 65 | |
| 66 | reg struct arg *ap; /*first free argument*/ |
| 67 | |
| 68 | reg struct symtab *p; |
| 69 | reg struct symtab *stpt; |
| 70 | |
| 71 | struct strdesc *stringp; /*handles string lists*/ |
| 72 | |
| 73 | int regno; /*handles arguments*/ |
| 74 | int *ptrregno = ®no; |
| 75 | int sawmul; /*saw * */ |
| 76 | int sawindex; /*saw [rn]*/ |
| 77 | int sawsize; |
| 78 | int seg_type; /*the kind of segment: data or text*/ |
| 79 | int seg_number; /*the segment number*/ |
| 80 | int space_value; /*how much .space needs*/ |
| 81 | int fill_rep; /*how many reps for .fill */ |
| 82 | int fill_size; /*how many bytes for .fill */ |
| 83 | |
| 84 | int field_width; /*how wide a field is to be*/ |
| 85 | int field_value; /*the value to stuff in a field*/ |
| 86 | char *stabname; /*name of stab dealing with*/ |
| 87 | ptrall stabstart; /*where the stab starts in the buffer*/ |
| 88 | int reloc_how; /* how to relocate expressions */ |
| 89 | int toconv; /* how to convert bignums */ |
| 90 | int incasetable; /* set if in a case table */ |
| 91 | |
| 92 | incasetable = 0; |
| 93 | xp = explist; |
| 94 | ap = arglist; |
| 95 | |
| 96 | val = yylex(); |
| 97 | |
| 98 | while (val != PARSEEOF){ /* primary loop */ |
| 99 | |
| 100 | while (INTOKSET(val, LINSTBEGIN)){ |
| 101 | if (val == INT) { |
| 102 | int i = ((struct exp *)yylval)->e_xvalue; |
| 103 | shift; |
| 104 | if (val != COLON){ |
| 105 | yyerror("Local label %d is not followed by a ':' for a label definition", |
| 106 | i); |
| 107 | goto errorfix; |
| 108 | } |
| 109 | if (i < 0 || i > 9) { |
| 110 | yyerror("Local labels are 0-9"); |
| 111 | goto errorfix; |
| 112 | } |
| 113 | (void)sprintf(yytext, "L%d\001%d", i, lgensym[i]); |
| 114 | lgensym[i]++; |
| 115 | genref[i] = 0; |
| 116 | yylval = (int)*lookup(passno == 1); |
| 117 | val = NAME; |
| 118 | np = (struct symtab *)yylval; |
| 119 | goto restlab; |
| 120 | } |
| 121 | if (val == NL){ |
| 122 | lineno++; |
| 123 | shift; |
| 124 | } else |
| 125 | if (val == SEMI) |
| 126 | shift; |
| 127 | else { /*its a name, so we have a label or def */ |
| 128 | if (val != NAME){ |
| 129 | ERROR("Name expected for a label"); |
| 130 | } |
| 131 | np = (struct symtab *)yylval; |
| 132 | shiftover(NAME); |
| 133 | if (val != COLON) { |
| 134 | yyerror("\"%s\" is not followed by a ':' for a label definition", |
| 135 | FETCHNAME(np)); |
| 136 | goto errorfix; |
| 137 | } |
| 138 | restlab: |
| 139 | shift; |
| 140 | flushfield(NBPW/4); |
| 141 | if ((np->s_type&XTYPE)!=XUNDEF) { |
| 142 | if( (np->s_type&XTYPE)!=dotp->e_xtype |
| 143 | || np->s_value!=dotp->e_xvalue |
| 144 | || ( (passno==1) |
| 145 | &&(np->s_index != dotp->e_xloc) |
| 146 | ) |
| 147 | ){ |
| 148 | #ifndef DEBUG |
| 149 | if (FETCHNAME(np)[0] != 'L') |
| 150 | #endif not DEBUG |
| 151 | { |
| 152 | if (passno == 1) |
| 153 | yyerror("%s redefined", |
| 154 | FETCHNAME(np)); |
| 155 | else |
| 156 | yyerror("%s redefined: PHASE ERROR, 1st: %d, 2nd: %d", |
| 157 | FETCHNAME(np), |
| 158 | np->s_value, |
| 159 | dotp->e_xvalue); |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | np->s_type &= ~(XTYPE|XFORW); |
| 164 | np->s_type |= dotp->e_xtype; |
| 165 | np->s_value = dotp->e_xvalue; |
| 166 | if (passno == 1){ |
| 167 | np->s_index = dotp-usedot; |
| 168 | if (FETCHNAME(np)[0] == 'L'){ |
| 169 | nlabels++; |
| 170 | } |
| 171 | np->s_tag = LABELID; |
| 172 | } |
| 173 | } /*end of this being a label*/ |
| 174 | } /*end of to consuming all labels, NLs and SEMIS */ |
| 175 | |
| 176 | xp = explist; |
| 177 | ap = arglist; |
| 178 | |
| 179 | /* |
| 180 | * process the INSTRUCTION body |
| 181 | */ |
| 182 | switch(val){ |
| 183 | |
| 184 | default: |
| 185 | ERROR("Unrecognized instruction or directive"); |
| 186 | |
| 187 | case IABORT: |
| 188 | shift; |
| 189 | sawabort(); |
| 190 | /*NOTREACHED*/ |
| 191 | break; |
| 192 | |
| 193 | case PARSEEOF: |
| 194 | tokptr -= sizeof(bytetoktype); |
| 195 | *tokptr++ = VOID; |
| 196 | tokptr[1] = VOID; |
| 197 | tokptr[2] = PARSEEOF; |
| 198 | break; |
| 199 | |
| 200 | case IFILE: |
| 201 | shift; |
| 202 | stringp = (struct strdesc *)yylval; |
| 203 | shiftover(STRING); |
| 204 | dotsname = &UDotsname[0]; |
| 205 | movestr(dotsname, stringp->sd_string, |
| 206 | min(stringp->sd_strlen, sizeof(UDotsname))); |
| 207 | break; |
| 208 | |
| 209 | case ILINENO: |
| 210 | shift; /*over the ILINENO*/ |
| 211 | expr(locxp, val); |
| 212 | lineno = locxp->e_xvalue; |
| 213 | break; |
| 214 | |
| 215 | case ISET: /* .set <name> , <expr> */ |
| 216 | shift; |
| 217 | np = (struct symtab *)yylval; |
| 218 | shiftover(NAME); |
| 219 | shiftover(CM); |
| 220 | expr(locxp, val); |
| 221 | np->s_type &= (XXTRN|XFORW); |
| 222 | np->s_type |= locxp->e_xtype&(XTYPE|XFORW); |
| 223 | np->s_value = locxp->e_xvalue; |
| 224 | if (passno==1) |
| 225 | np->s_index = locxp->e_xloc; |
| 226 | if ((locxp->e_xtype&XTYPE) == XUNDEF) |
| 227 | yyerror("Illegal set?"); |
| 228 | break; |
| 229 | |
| 230 | case ILSYM: /*.lsym name , expr */ |
| 231 | shift; |
| 232 | np = (struct symtab *)yylval; |
| 233 | shiftover(NAME); |
| 234 | shiftover(CM); |
| 235 | expr(locxp, val); |
| 236 | /* |
| 237 | * Build the unique occurance of the |
| 238 | * symbol. |
| 239 | * The character scanner will have |
| 240 | * already entered it into the symbol |
| 241 | * table, but we should remove it |
| 242 | */ |
| 243 | if (passno == 1){ |
| 244 | stpt = (struct symtab *)symalloc(); |
| 245 | stpt->s_name = np->s_name; |
| 246 | np->s_tag = OBSOLETE; /*invalidate original */ |
| 247 | nforgotten++; |
| 248 | np = stpt; |
| 249 | if ( (locxp->e_xtype & XTYPE) != XABS) |
| 250 | yyerror("Illegal second argument to lsym"); |
| 251 | np->s_value = locxp->e_xvalue; |
| 252 | np->s_type = XABS; |
| 253 | np->s_tag = ILSYM; |
| 254 | } |
| 255 | break; |
| 256 | |
| 257 | case IGLOBAL: /*.globl <name> */ |
| 258 | shift; |
| 259 | np = (struct symtab *)yylval; |
| 260 | shiftover(NAME); |
| 261 | np->s_type |= XXTRN; |
| 262 | break; |
| 263 | |
| 264 | case IDATA: /*.data [ <expr> ] */ |
| 265 | case ITEXT: /*.text [ <expr> ] */ |
| 266 | seg_type = -val; |
| 267 | shift; |
| 268 | if (INTOKSET(val, EBEGOPS+YUKKYEXPRBEG+SAFEEXPRBEG)){ |
| 269 | expr(locxp, val); |
| 270 | seg_type = -seg_type; /*now, it is positive*/ |
| 271 | } |
| 272 | |
| 273 | if (seg_type < 0) { /*there wasn't an associated expr*/ |
| 274 | seg_number = 0; |
| 275 | seg_type = -seg_type; |
| 276 | } else { |
| 277 | if ( ((locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 278 | || (seg_number = locxp->e_xvalue) >= NLOC) { |
| 279 | yyerror("illegal location counter"); |
| 280 | seg_number = 0; |
| 281 | } |
| 282 | } |
| 283 | if (seg_type == IDATA) |
| 284 | seg_number += NLOC; |
| 285 | flushfield(NBPW/4); |
| 286 | dotp = &usedot[seg_number]; |
| 287 | if (passno==2) { /* go salt away in pass 2*/ |
| 288 | txtfil = usefile[seg_number]; |
| 289 | relfil = rusefile[seg_number]; |
| 290 | } |
| 291 | break; |
| 292 | |
| 293 | /* |
| 294 | * Storage filler directives: |
| 295 | * |
| 296 | * .byte [<exprlist>] |
| 297 | * |
| 298 | * exprlist: empty | exprlist outexpr |
| 299 | * outexpr: <expr> | <expr> : <expr> |
| 300 | */ |
| 301 | case IBYTE: curlen = NBPW/4; goto elist; |
| 302 | case IWORD: curlen = NBPW/2; goto elist; |
| 303 | case IINT: curlen = NBPW; goto elist; |
| 304 | case ILONG: curlen = NBPW; goto elist; |
| 305 | |
| 306 | elist: |
| 307 | seg_type = val; |
| 308 | shift; |
| 309 | |
| 310 | /* |
| 311 | * Expression List processing |
| 312 | */ |
| 313 | if (INTOKSET(val, EBEGOPS+YUKKYEXPRBEG+SAFEEXPRBEG)){ |
| 314 | do{ |
| 315 | /* |
| 316 | * expression list consists of a list of : |
| 317 | * <expr> |
| 318 | * <expr> : <expr> |
| 319 | * (pack expr2 into expr1 bits |
| 320 | */ |
| 321 | expr(locxp, val); |
| 322 | /* |
| 323 | * now, pointing at the next token |
| 324 | */ |
| 325 | if (val == COLON){ |
| 326 | shiftover(COLON); |
| 327 | expr(pval, val); |
| 328 | if ((locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 329 | yyerror("Width not absolute"); |
| 330 | field_width = locxp->e_xvalue; |
| 331 | locxp = pval; |
| 332 | if (bitoff + field_width > curlen) |
| 333 | flushfield(curlen); |
| 334 | if (field_width > curlen) |
| 335 | yyerror("Expression crosses field boundary"); |
| 336 | } else { |
| 337 | field_width = curlen; |
| 338 | flushfield(curlen); |
| 339 | } |
| 340 | |
| 341 | if ((locxp->e_xtype & XTYPE) != XABS) { |
| 342 | if (bitoff) |
| 343 | yyerror("Illegal relocation in field"); |
| 344 | switch(curlen){ |
| 345 | case NBPW/4: reloc_how = TYPB; break; |
| 346 | case NBPW/2: reloc_how = TYPW; break; |
| 347 | case NBPW: reloc_how = TYPL; break; |
| 348 | } |
| 349 | if (passno == 1){ |
| 350 | dotp->e_xvalue += ty_nbyte[reloc_how]; |
| 351 | } else { |
| 352 | outrel(locxp, reloc_how); |
| 353 | } |
| 354 | } else { |
| 355 | /* |
| 356 | * |
| 357 | * See if we are doing a case instruction. |
| 358 | * If so, then see if the branch distance, |
| 359 | * stored as a word, |
| 360 | * is going to loose sig bits. |
| 361 | */ |
| 362 | if (passno == 2 && incasetable){ |
| 363 | if ( (locxp->e_xvalue < -32768) |
| 364 | ||(locxp->e_xvalue > 32767)){ |
| 365 | yyerror("Case will branch too far"); |
| 366 | } |
| 367 | } |
| 368 | field_value = locxp->e_xvalue & ( (1L << field_width)-1); |
| 369 | bitfield |= field_value << bitoff; |
| 370 | bitoff += field_width; |
| 371 | } |
| 372 | xp = explist; |
| 373 | if (auxval = (val == CM)) |
| 374 | shift; |
| 375 | } while (auxval); |
| 376 | } /* there existed an expression at all */ |
| 377 | |
| 378 | flushfield(curlen); |
| 379 | if ( ( curlen == NBPW/4) && bitoff) |
| 380 | dotp->e_xvalue ++; |
| 381 | break; |
| 382 | /*end of case IBYTE, IWORD, ILONG, IINT*/ |
| 383 | |
| 384 | case ISPACE: /* .space <expr> */ |
| 385 | shift; |
| 386 | expr(locxp, val); |
| 387 | if ((locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 388 | yyerror("Space size not absolute"); |
| 389 | space_value = locxp->e_xvalue; |
| 390 | ospace: |
| 391 | flushfield(NBPW/4); |
| 392 | { |
| 393 | static char spacebuf[128]; |
| 394 | while (space_value > sizeof(spacebuf)){ |
| 395 | outs(spacebuf, sizeof(spacebuf)); |
| 396 | space_value -= sizeof(spacebuf); |
| 397 | } |
| 398 | outs(spacebuf, space_value); |
| 399 | } |
| 400 | break; |
| 401 | |
| 402 | /* |
| 403 | * .fill rep, size, value |
| 404 | * repeat rep times: fill size bytes with (truncated) value |
| 405 | * size must be between 1 and 8 |
| 406 | */ |
| 407 | case IFILL: |
| 408 | shift; |
| 409 | expr(locxp, val); |
| 410 | if ( (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 411 | yyerror("Fill repetition count not absolute"); |
| 412 | fill_rep = locxp->e_xvalue; |
| 413 | shiftover(CM); |
| 414 | expr(locxp, val); |
| 415 | if ( (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 416 | yyerror("Fill size not absolute"); |
| 417 | fill_size = locxp->e_xvalue; |
| 418 | if (fill_size <= 0 || fill_size > 8) |
| 419 | yyerror("Fill count not in in 1..8"); |
| 420 | shiftover(CM); |
| 421 | expr(locxp, val); |
| 422 | if (passno == 2 && (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 423 | yyerror("Fill value not absolute"); |
| 424 | flushfield(NBPW/4); |
| 425 | if (passno == 1) { |
| 426 | dotp->e_xvalue += fill_rep * fill_size; |
| 427 | } else { |
| 428 | while(fill_rep-- > 0) |
| 429 | bwrite((char *)&locxp->e_xvalue, fill_size, txtfil); |
| 430 | } |
| 431 | break; |
| 432 | |
| 433 | case IASCII: /* .ascii [ <stringlist> ] */ |
| 434 | case IASCIZ: /* .asciz [ <stringlist> ] */ |
| 435 | auxval = val; |
| 436 | shift; |
| 437 | /* |
| 438 | * Code to consume a string list |
| 439 | * |
| 440 | * stringlist: empty | STRING | stringlist STRING |
| 441 | */ |
| 442 | while (val == STRING){ |
| 443 | int mystrlen; |
| 444 | flushfield(NBPW/4); |
| 445 | if (bitoff) |
| 446 | dotp->e_xvalue++; |
| 447 | stringp = (struct strdesc *)yylval; |
| 448 | /* |
| 449 | * utilize the string scanner cheat; |
| 450 | * the scanner appended a null byte on the string, |
| 451 | * but didn't charge it to sd_strlen |
| 452 | */ |
| 453 | mystrlen = stringp->sd_strlen; |
| 454 | mystrlen += (auxval == IASCIZ) ? 1 : 0; |
| 455 | if (passno == 2){ |
| 456 | if (stringp->sd_place & STR_CORE){ |
| 457 | outs(stringp->sd_string, mystrlen); |
| 458 | } else { |
| 459 | int i, nread; |
| 460 | fseek(strfile, stringp->sd_stroff, 0); |
| 461 | for (i = 0; i < mystrlen;/*VOID*/){ |
| 462 | nread = fread(yytext, 1, |
| 463 | min(mystrlen - i, |
| 464 | sizeof(yytext)), strfile); |
| 465 | outs(yytext, nread); |
| 466 | i += nread; |
| 467 | } |
| 468 | } |
| 469 | } else { |
| 470 | dotp->e_xvalue += mystrlen; |
| 471 | } |
| 472 | shift; /*over the STRING*/ |
| 473 | if (val == CM) /*could be a split string*/ |
| 474 | shift; |
| 475 | } |
| 476 | break; |
| 477 | |
| 478 | case IORG: /* .org <expr> */ |
| 479 | shift; |
| 480 | expr(locxp, val); |
| 481 | |
| 482 | if ((locxp->e_xtype & XTYPE) == XABS) /* tekmdp */ |
| 483 | orgwarn++; |
| 484 | else if ((locxp->e_xtype & ~XXTRN) != dotp->e_xtype) |
| 485 | yyerror("Illegal expression to set origin"); |
| 486 | space_value = locxp->e_xvalue - dotp->e_xvalue; |
| 487 | if (space_value < 0) |
| 488 | yyerror("Backwards 'org'"); |
| 489 | goto ospace; |
| 490 | break; |
| 491 | |
| 492 | /* |
| 493 | * |
| 494 | * Process stabs. Stabs are created only by the f77 |
| 495 | * and the C compiler with the -g flag set. |
| 496 | * We only look at the stab ONCE, during pass 1, and |
| 497 | * virtually remove the stab from the intermediate file |
| 498 | * so it isn't seen during pass2. This makes for some |
| 499 | * hairy processing to handle labels occuring in |
| 500 | * stab entries, but since most expressions in the |
| 501 | * stab are integral we save lots of time in the second |
| 502 | * pass by not looking at the stabs. |
| 503 | * A stab that is tagged floating will be bumped during |
| 504 | * the jxxx resolution phase. A stab tagged fixed will |
| 505 | * not be be bumped. |
| 506 | * |
| 507 | * .stab: Old fashioned stabs |
| 508 | * .stabn: For stabs without names |
| 509 | * .stabs: For stabs with string names |
| 510 | * .stabd: For stabs for line numbers or bracketing, |
| 511 | * without a string name, without |
| 512 | * a final expression. The value of the |
| 513 | * final expression is taken to be the current |
| 514 | * location counter, and is patched by the 2nd pass |
| 515 | * |
| 516 | * .stab{<expr>,}*NCPName,<expr>, <expr>, <expr>, <expr> |
| 517 | * .stabn <expr>, <expr>, <expr>, <expr> |
| 518 | * .stabs STRING, <expr>, <expr>, <expr>, <expr> |
| 519 | * .stabd <expr>, <expr>, <expr> # . |
| 520 | */ |
| 521 | case ISTAB: |
| 522 | yyerror(".stab directive no longer supported"); |
| 523 | goto errorfix; |
| 524 | |
| 525 | tailstab: |
| 526 | expr(locxp, val); |
| 527 | if (! (locxp->e_xvalue & STABTYPS)){ |
| 528 | yyerror("Invalid type in %s", stabname); |
| 529 | goto errorfix; |
| 530 | } |
| 531 | stpt->s_ptype = locxp->e_xvalue; |
| 532 | shiftover(CM); |
| 533 | expr(locxp, val); |
| 534 | stpt->s_other = locxp->e_xvalue; |
| 535 | shiftover(CM); |
| 536 | expr(locxp, val); |
| 537 | stpt->s_desc = locxp->e_xvalue; |
| 538 | shiftover(CM); |
| 539 | exprisname = 0; |
| 540 | expr(locxp, val); |
| 541 | p = locxp->e_xname; |
| 542 | if (p == NULL) { /*absolute expr to begin with*/ |
| 543 | stpt->s_value = locxp->e_xvalue; |
| 544 | stpt->s_index = dotp - usedot; |
| 545 | if (exprisname){ |
| 546 | switch(stpt->s_ptype){ |
| 547 | case N_GSYM: |
| 548 | case N_FNAME: |
| 549 | case N_RSYM: |
| 550 | case N_SSYM: |
| 551 | case N_LSYM: |
| 552 | case N_PSYM: |
| 553 | case N_BCOMM: |
| 554 | case N_ECOMM: |
| 555 | case N_LENG: |
| 556 | stpt->s_tag = STABFIXED; |
| 557 | break; |
| 558 | default: |
| 559 | stpt->s_tag = STABFLOATING; |
| 560 | break; |
| 561 | } |
| 562 | } else |
| 563 | stpt->s_tag = STABFIXED; |
| 564 | } |
| 565 | else { /*really have a name*/ |
| 566 | stpt->s_dest = locxp->e_xname; |
| 567 | stpt->s_index = p->s_index; |
| 568 | stpt->s_type = p->s_type | STABFLAG; |
| 569 | /* |
| 570 | * We will assign a more accruate |
| 571 | * guess of locxp's location when |
| 572 | * we sort the symbol table |
| 573 | * The final value of value is |
| 574 | * given by stabfix() |
| 575 | */ |
| 576 | /* |
| 577 | * For exprs of the form (name + value) one needs to remember locxp->e_xvalue |
| 578 | * for use in stabfix. The right place to keep this is in stpt->s_value |
| 579 | * however this gets corrupted at an unknown point. |
| 580 | * As a bandaid hack the value is preserved in s_desc and s_other (a |
| 581 | * short and a char). This destroys these two values and will |
| 582 | * be fixed. May 19 ,1983 Alastair Fyfe |
| 583 | */ |
| 584 | if(locxp->e_xvalue) { |
| 585 | stpt->s_other = (locxp->e_xvalue >> 16); |
| 586 | stpt->s_desc = (locxp->e_xvalue & 0x0000ffff); |
| 587 | stpt->s_tag = STABFLOATING; |
| 588 | } |
| 589 | } |
| 590 | /* |
| 591 | * tokptr now points at one token beyond |
| 592 | * the current token stored in val and yylval, |
| 593 | * which are the next tokens after the end of |
| 594 | * this .stab directive. This next token must |
| 595 | * be either a SEMI or NL, so is of width just |
| 596 | * one. Therefore, to point to the next token |
| 597 | * after the end of this stab, just back up one.. |
| 598 | */ |
| 599 | buildskip(stabstart, (bytetoktype *)tokptr - sizeof(bytetoktype)); |
| 600 | break; /*end of the .stab*/ |
| 601 | |
| 602 | case ISTABDOT: |
| 603 | stabname = ".stabd"; |
| 604 | stpt = (struct symtab *)yylval; |
| 605 | /* |
| 606 | * We clobber everything after the |
| 607 | * .stabd and its pointer... we MUST |
| 608 | * be able to get back to this .stabd |
| 609 | * so that we can resolve its final value |
| 610 | */ |
| 611 | stabstart = tokptr; |
| 612 | shift; /*over the ISTABDOT*/ |
| 613 | if (passno == 1){ |
| 614 | expr(locxp, val); |
| 615 | if (! (locxp->e_xvalue & STABTYPS)){ |
| 616 | yyerror("Invalid type in .stabd"); |
| 617 | goto errorfix; |
| 618 | } |
| 619 | stpt->s_ptype = locxp->e_xvalue; |
| 620 | shiftover(CM); |
| 621 | expr(locxp, val); |
| 622 | stpt->s_other = locxp->e_xvalue; |
| 623 | shiftover(CM); |
| 624 | expr(locxp, val); |
| 625 | stpt->s_desc = locxp->e_xvalue; |
| 626 | /* |
| 627 | * |
| 628 | * Now, clobber everything but the |
| 629 | * .stabd pseudo and the pointer |
| 630 | * to its symbol table entry |
| 631 | * tokptr points to the next token, |
| 632 | * build the skip up to this |
| 633 | */ |
| 634 | buildskip(stabstart, (bytetoktype *)tokptr - sizeof(bytetoktype)); |
| 635 | } |
| 636 | /* |
| 637 | * pass 1: Assign a good guess for its position |
| 638 | * (ensures they are sorted into right place)/ |
| 639 | * pass 2: Fix the actual value |
| 640 | */ |
| 641 | stpt->s_value = dotp->e_xvalue; |
| 642 | stpt->s_index = dotp - usedot; |
| 643 | stpt->s_tag = STABFLOATING; /*although it has no effect in pass 2*/ |
| 644 | break; |
| 645 | |
| 646 | case ISTABNONE: stabname = ".stabn"; goto shortstab; |
| 647 | |
| 648 | case ISTABSTR: stabname = ".stabs"; |
| 649 | shortstab: |
| 650 | auxval = val; |
| 651 | if (passno == 2) goto errorfix; |
| 652 | stpt = (struct symtab *)yylval; |
| 653 | stabstart = tokptr; |
| 654 | (bytetoktype *)stabstart -= sizeof(struct symtab *); |
| 655 | (bytetoktype *)stabstart -= sizeof(bytetoktype); |
| 656 | shift; |
| 657 | if (auxval == ISTABSTR){ |
| 658 | stringp = (struct strdesc *)yylval; |
| 659 | shiftover(STRING); |
| 660 | stpt->s_name = (char *)stringp; |
| 661 | /* |
| 662 | * We want the trailing null included in this string. |
| 663 | * We utilize the cheat the string scanner used, |
| 664 | * and merely increment the string length |
| 665 | */ |
| 666 | stringp->sd_strlen += 1; |
| 667 | shiftover(CM); |
| 668 | } else { |
| 669 | stpt->s_name = (char *)savestr("\0", 0, STR_BOTH); |
| 670 | } |
| 671 | goto tailstab; |
| 672 | break; |
| 673 | |
| 674 | case ICOMM: /* .comm <name> , <expr> */ |
| 675 | case ILCOMM: /* .lcomm <name> , <expr> */ |
| 676 | auxval = val; |
| 677 | shift; |
| 678 | np = (struct symtab *)yylval; |
| 679 | shiftover(NAME); |
| 680 | shiftover(CM); |
| 681 | expr(locxp, val); |
| 682 | |
| 683 | if ( (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 684 | yyerror("comm size not absolute"); |
| 685 | if (passno == 1 && (np->s_type&XTYPE) != XUNDEF) |
| 686 | yyerror("Redefinition of %s", FETCHNAME(np)); |
| 687 | if (passno==1) { |
| 688 | np->s_value = locxp->e_xvalue; |
| 689 | if (auxval == ICOMM) |
| 690 | np->s_type |= XXTRN; |
| 691 | else { |
| 692 | np->s_type &= ~XTYPE; |
| 693 | np->s_type |= XBSS; |
| 694 | } |
| 695 | } |
| 696 | break; |
| 697 | |
| 698 | case IALIGN: /* .align <expr> */ |
| 699 | stpt = (struct symtab *)yylval; |
| 700 | shift; |
| 701 | expr(locxp, val); |
| 702 | jalign(locxp, stpt); |
| 703 | break; |
| 704 | |
| 705 | case INST0: /* instructions w/o arguments*/ |
| 706 | incasetable = 0; |
| 707 | insout(yyopcode, (struct arg *)0, 0); |
| 708 | shift; |
| 709 | break; |
| 710 | |
| 711 | case INSTn: /* instructions with arguments*/ |
| 712 | case IJXXX: /* UNIX style jump instructions */ |
| 713 | auxval = val; |
| 714 | /* |
| 715 | * Code to process an argument list |
| 716 | */ |
| 717 | ap = arglist; |
| 718 | xp = explist; |
| 719 | |
| 720 | shift; /* bring in the first token for the arg list*/ |
| 721 | |
| 722 | for (argcnt = 1; argcnt <= 6; argcnt++, ap++){ |
| 723 | /* |
| 724 | * code to process an argument proper |
| 725 | */ |
| 726 | sawindex = sawmul = sawsize = 0; |
| 727 | { |
| 728 | switch(val) { |
| 729 | |
| 730 | default: |
| 731 | disp: |
| 732 | if( !(INTOKSET(val, |
| 733 | EBEGOPS |
| 734 | +YUKKYEXPRBEG |
| 735 | +SAFEEXPRBEG)) ) { |
| 736 | ERROR("expression expected"); |
| 737 | } |
| 738 | expr(ap->a_xp,val); |
| 739 | overdisp: |
| 740 | if ( val == LP || sawsize){ |
| 741 | shiftover(LP); |
| 742 | findreg(regno); |
| 743 | shiftover(RP); |
| 744 | ap->a_atype = ADISP; |
| 745 | ap->a_areg1 = regno; |
| 746 | } else { |
| 747 | ap->a_atype = AEXP; |
| 748 | ap->a_areg1 = 0; |
| 749 | } |
| 750 | goto index; |
| 751 | |
| 752 | case SIZESPEC: |
| 753 | sizespec: |
| 754 | sawsize = yylval; |
| 755 | shift; |
| 756 | goto disp; |
| 757 | |
| 758 | case REG: |
| 759 | case REGOP: |
| 760 | findreg(regno); |
| 761 | ap->a_atype = AREG; |
| 762 | ap->a_areg1 = regno; |
| 763 | break; |
| 764 | |
| 765 | case MUL: |
| 766 | sawmul = 1; |
| 767 | shift; |
| 768 | if (val == LP) goto base; |
| 769 | if (val == LITOP) goto imm; |
| 770 | if (val == SIZESPEC) goto sizespec; |
| 771 | if (INTOKSET(val, |
| 772 | EBEGOPS |
| 773 | +YUKKYEXPRBEG |
| 774 | +SAFEEXPRBEG)) goto disp; |
| 775 | ERROR("expression, '(' or '$' expected"); |
| 776 | break; |
| 777 | |
| 778 | case LP: |
| 779 | base: |
| 780 | shift; /*consume the LP*/ |
| 781 | /* |
| 782 | * hack the ambiguity of |
| 783 | * movl (expr) (rn), ... |
| 784 | * note that (expr) could also |
| 785 | * be (rn) (by special hole in the |
| 786 | * grammar), which we ensure |
| 787 | * means register indirection, instead |
| 788 | * of an expression with value n |
| 789 | */ |
| 790 | if (val != REG && val != REGOP){ |
| 791 | droppedLP = 1; |
| 792 | val = exprparse(val, &(ap->a_xp)); |
| 793 | droppedLP = 0; |
| 794 | goto overdisp; |
| 795 | } |
| 796 | findreg(regno); |
| 797 | shiftover(RP); |
| 798 | if (val == PLUS){ |
| 799 | shift; |
| 800 | ap->a_atype = AINCR; |
| 801 | } else |
| 802 | ap->a_atype = ABASE; |
| 803 | ap->a_areg1 = regno; |
| 804 | goto index; |
| 805 | |
| 806 | case LITOP: |
| 807 | imm: |
| 808 | shift; |
| 809 | expr(locxp, val); |
| 810 | ap->a_atype = AIMM; |
| 811 | ap->a_areg1 = 0; |
| 812 | ap->a_xp = locxp; |
| 813 | goto index; |
| 814 | |
| 815 | case MP: |
| 816 | shift; /* -(reg) */ |
| 817 | findreg(regno); |
| 818 | shiftover(RP); |
| 819 | ap->a_atype = ADECR; |
| 820 | ap->a_areg1 = regno; |
| 821 | index: /*look for [reg] */ |
| 822 | if (val == LB){ |
| 823 | shift; |
| 824 | findreg(regno); |
| 825 | shiftover(RB); |
| 826 | sawindex = 1; |
| 827 | ap->a_areg2 = regno; |
| 828 | } |
| 829 | break; |
| 830 | |
| 831 | } /*end of the switch to process an arg*/ |
| 832 | } /*end of processing an argument*/ |
| 833 | |
| 834 | if (sawmul){ |
| 835 | /* |
| 836 | * Make a concession for *(%r) |
| 837 | * meaning *0(%r) |
| 838 | */ |
| 839 | if (ap->a_atype == ABASE) { |
| 840 | ap->a_atype = ADISP; |
| 841 | xp->e_xtype = XABS; |
| 842 | xp->e_number = Znumber; |
| 843 | xp->e_number.num_tag = TYPL; |
| 844 | xp->e_xloc = 0; |
| 845 | ap->a_xp = xp++; |
| 846 | } |
| 847 | ap->a_atype |= ASTAR; |
| 848 | sawmul = 0; |
| 849 | } |
| 850 | if (sawindex){ |
| 851 | ap->a_atype |= AINDX; |
| 852 | sawindex = 0; |
| 853 | } |
| 854 | ap->a_dispsize = sawsize == 0 ? d124 : sawsize; |
| 855 | if (val != CM) break; |
| 856 | shiftover(CM); |
| 857 | } /*processing all the arguments*/ |
| 858 | |
| 859 | if (argcnt > 6){ |
| 860 | yyerror("More than 6 arguments"); |
| 861 | goto errorfix; |
| 862 | } |
| 863 | |
| 864 | /* |
| 865 | * See if this is a case instruction, |
| 866 | * so we can set up tests on the following |
| 867 | * vector of branch displacements |
| 868 | */ |
| 869 | if (yyopcode.Op_eopcode == CORE){ |
| 870 | switch(yyopcode.Op_popcode){ |
| 871 | case 0x8f: /* caseb */ |
| 872 | case 0xaf: /* casew */ |
| 873 | case 0xcf: /* casel */ |
| 874 | incasetable++; |
| 875 | break; |
| 876 | default: |
| 877 | incasetable = 0; |
| 878 | break; |
| 879 | } |
| 880 | } |
| 881 | |
| 882 | insout(yyopcode, arglist, |
| 883 | auxval == INSTn ? argcnt : - argcnt); |
| 884 | break; |
| 885 | |
| 886 | case IQUAD: toconv = TYPQ; goto bignumlist; |
| 887 | case IOCTA: toconv = TYPO; goto bignumlist; |
| 888 | |
| 889 | case IFFLOAT: toconv = TYPF; goto bignumlist; |
| 890 | case IDFLOAT: toconv = TYPD; goto bignumlist; |
| 891 | case IGFLOAT: toconv = TYPG; goto bignumlist; |
| 892 | case IHFLOAT: toconv = TYPH; goto bignumlist; |
| 893 | bignumlist: |
| 894 | /* |
| 895 | * eat a list of non 32 bit numbers. |
| 896 | * IQUAD and IOCTA can, possibly, return |
| 897 | * INT's, if the numbers are "small". |
| 898 | * |
| 899 | * The value of the numbers is coming back |
| 900 | * as an expression, NOT in yybignum. |
| 901 | */ |
| 902 | shift; /* over the opener */ |
| 903 | if ((val == BIGNUM) || (val == INT)){ |
| 904 | do{ |
| 905 | if ((val != BIGNUM) && (val != INT)){ |
| 906 | ERROR(ty_float[toconv] |
| 907 | ? "floating number expected" |
| 908 | : "integer number expected" ); |
| 909 | } |
| 910 | dotp->e_xvalue += ty_nbyte[toconv]; |
| 911 | if (passno == 2){ |
| 912 | bignumwrite( |
| 913 | ((struct exp *)yylval)->e_number, |
| 914 | toconv); |
| 915 | } |
| 916 | xp = explist; |
| 917 | shift; /* over this number */ |
| 918 | if (auxval = (val == CM)) |
| 919 | shift; /* over the comma */ |
| 920 | } while (auxval); /* as long as there are commas */ |
| 921 | } |
| 922 | break; |
| 923 | /* end of the case for initialized big numbers */ |
| 924 | } /*end of the switch for looking at each reserved word*/ |
| 925 | |
| 926 | continue; |
| 927 | |
| 928 | errorfix: |
| 929 | /* |
| 930 | * got here by either requesting to skip to the |
| 931 | * end of this statement, or by erroring out and |
| 932 | * wanting to apply panic mode recovery |
| 933 | */ |
| 934 | while ( (val != NL) |
| 935 | && (val != SEMI) |
| 936 | && (val != PARSEEOF) |
| 937 | ){ |
| 938 | shift; |
| 939 | } |
| 940 | if (val == NL) |
| 941 | lineno++; |
| 942 | shift; |
| 943 | |
| 944 | } /*end of the loop to read the entire file, line by line*/ |
| 945 | |
| 946 | } /*end of yyparse*/ |
| 947 | |
| 948 | /* |
| 949 | * Process a register declaration of the form |
| 950 | * % <expr> |
| 951 | * |
| 952 | * Note: |
| 953 | * The scanner has already processed funny registers of the form |
| 954 | * %dd[+-]*, where dd is a decimal number in the range 00 to 15 (optional |
| 955 | * preceding zero digit). If there was any space between the % and |
| 956 | * the digit, the scanner wouldn't have recognized it, so we |
| 957 | * hack it out here. |
| 958 | */ |
| 959 | inttoktype funnyreg(val, regnoback) /*what the read head will sit on*/ |
| 960 | inttoktype val; /*what the read head is sitting on*/ |
| 961 | int *regnoback; /*call by return*/ |
| 962 | { |
| 963 | reg struct exp *locxp; |
| 964 | struct exp *loc1xp; |
| 965 | struct exp **ptrloc1xp = & loc1xp; |
| 966 | |
| 967 | expr(locxp, val); /*and leave the current read head with value*/ |
| 968 | if ( (passno == 2) && |
| 969 | ( (locxp->e_xtype & XTYPE) != XABS |
| 970 | || (locxp->e_xvalue < 0) |
| 971 | || (locxp->e_xvalue >= 16) |
| 972 | ) |
| 973 | ){ |
| 974 | yyerror("Illegal register"); |
| 975 | return(0); |
| 976 | } |
| 977 | *regnoback = locxp->e_xvalue; |
| 978 | return(val); |
| 979 | } |
| 980 | /* |
| 981 | * Shift over error |
| 982 | */ |
| 983 | shiftoerror(token) |
| 984 | int token; |
| 985 | { |
| 986 | char *tok_to_name(); |
| 987 | yyerror("%s expected", tok_to_name(token)); |
| 988 | } |
| 989 | |
| 990 | /*VARARGS1*/ |
| 991 | yyerror(s, a1, a2,a3,a4,a5) |
| 992 | char *s; |
| 993 | { |
| 994 | |
| 995 | #define sink stdout |
| 996 | |
| 997 | if (anyerrs == 0 && anywarnings == 0 && ! silent) |
| 998 | fprintf(sink, "Assembler:\n"); |
| 999 | anyerrs++; |
| 1000 | if (silent) |
| 1001 | return; |
| 1002 | fprintf(sink, "\"%s\", line %d: ", dotsname, lineno); |
| 1003 | fprintf(sink, s, a1, a2,a3,a4,a5); |
| 1004 | fprintf(sink, "\n"); |
| 1005 | #undef sink |
| 1006 | } |
| 1007 | |
| 1008 | /*VARARGS1*/ |
| 1009 | yywarning(s, a1, a2,a3,a4,a5) |
| 1010 | char *s; |
| 1011 | { |
| 1012 | #define sink stdout |
| 1013 | if (anyerrs == 0 && anywarnings == 0 && ! silent) |
| 1014 | fprintf(sink, "Assembler:\n"); |
| 1015 | anywarnings++; |
| 1016 | if (silent) |
| 1017 | return; |
| 1018 | fprintf(sink, "\"%s\", line %d: WARNING: ", dotsname, lineno); |
| 1019 | fprintf(sink, s, a1, a2,a3,a4,a5); |
| 1020 | fprintf(sink, "\n"); |
| 1021 | #undef sink |
| 1022 | } |