rdoff/rdoff.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2014 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * rdoff.c      library of routines for manipulating rdoff files
  36  */
  37
  38 /* TODO:        The functions in this module assume they are running
  39  *              on a little-endian machine. This should be fixed to
  40  *              make it portable.
  41  */
  42
  43 #include "compiler.h"
  44
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <errno.h>
  49
  50 #include "rdfutils.h"
  51
  52 /*
  53  * Comment this out to allow the module to read & write header record types
  54  * that it isn't aware of. With this defined, unrecognised header records
  55  * will generate error number 8, reported as 'unknown extended header record'.
  56  */
  57
  58 #define STRICT_ERRORS
  59
  60 /* ========================================================================
  61  * Code for memory buffers (for delayed writing of header until we know
  62  * how int32_t it is).
  63  * ======================================================================== */
  64
  65 static memorybuffer *newmembuf(void)
  66 {
  67     memorybuffer *t;
  68
  69     t = nasm_malloc(sizeof(memorybuffer));
  70     if (!t)
  71         return NULL;
  72
  73     t->length = 0;
  74     t->next = NULL;
  75     return t;
  76 }
  77
  78 static void membufwrite(memorybuffer * const b, void *data, int bytes)
  79 {
  80     uint16_t w;
  81     int32_t l;
  82     char *c;
  83
  84     if (b->next) {              /* memory buffer full - use next buffer */
  85         membufwrite(b->next, data, bytes);
  86         return;
  87     }
  88
  89     if ((bytes < 0 && b->length - bytes > BUF_BLOCK_LEN)
  90         || (bytes > 0 && b->length + bytes > BUF_BLOCK_LEN)) {
  91
  92         /* buffer full and no next allocated... allocate and initialise next
  93          * buffer */
  94         b->next = newmembuf();
  95         membufwrite(b->next, data, bytes);
  96         return;
  97     }
  98
  99     switch (bytes) {
 100     case -4:                   /* convert to little-endian */
 101         l = *(int32_t *)data;
 102         b->buffer[b->length++] = l & 0xFF;
 103         l >>= 8;
 104         b->buffer[b->length++] = l & 0xFF;
 105         l >>= 8;
 106         b->buffer[b->length++] = l & 0xFF;
 107         l >>= 8;
 108         b->buffer[b->length++] = l & 0xFF;
 109         break;
 110
 111     case -2:
 112         w = *(uint16_t *) data;
 113         b->buffer[b->length++] = w & 0xFF;
 114         w >>= 8;
 115         b->buffer[b->length++] = w & 0xFF;
 116         break;
 117
 118     default:
 119         c = data;
 120         while (bytes--)
 121             b->buffer[b->length++] = *c++;
 122         break;
 123     }
 124 }
 125
 126 static void membufdump(memorybuffer * b, FILE * fp)
 127 {
 128     if (!b)
 129         return;
 130
 131     nasm_write(b->buffer, b->length, fp);
 132     membufdump(b->next, fp);
 133 }
 134
 135 static int membuflength(memorybuffer * b)
 136 {
 137     if (!b)
 138         return 0;
 139     return b->length + membuflength(b->next);
 140 }
 141
 142 static void freemembuf(memorybuffer * b)
 143 {
 144     if (!b)
 145         return;
 146     freemembuf(b->next);
 147     nasm_free(b);
 148 }
 149
 150 /* =========================================================================
 151    General purpose routines and variables used by the library functions
 152    ========================================================================= */
 153
 154 /*
 155  * translateint32_t() and translateint16_t()
 156  *
 157  * translate from little endian to local representation
 158  */
 159 int32_t translateint32_t(int32_t in)
 160 {
 161     int32_t r;
 162     uint8_t *i;
 163
 164     i = (uint8_t *)&in;
 165     r = i[3];
 166     r = (r << 8) + i[2];
 167     r = (r << 8) + i[1];
 168     r = (r << 8) + *i;
 169
 170     return r;
 171 }
 172
 173 uint16_t translateint16_t(uint16_t in)
 174 {
 175     uint16_t r;
 176     uint8_t *i;
 177
 178     i = (uint8_t *)&in;
 179     r = (i[1] << 8) + i[0];
 180
 181     return r;
 182 }
 183
 184 /* Segment types */
 185 static char *knownsegtypes[8] = {
 186     "NULL", "text", "data", "object comment",
 187     "linked comment", "loader comment",
 188     "symbolic debug", "line number debug"
 189 };
 190
 191 /* Get a textual string describing the segment type */
 192 char *translatesegmenttype(uint16_t type)
 193 {
 194     if (type < 8)
 195         return knownsegtypes[type];
 196     if (type < 0x0020)
 197         return "reserved";
 198     if (type < 0x1000)
 199         return "reserved - Moscow";
 200     if (type < 0x8000)
 201         return "reserved - system dependant";
 202     if (type < 0xFFFF)
 203         return "reserved - other";
 204     if (type == 0xFFFF)
 205         return "invalid type code";
 206     return "type code out of range";
 207 }
 208
 209 /* This signature is written to the start of RDOFF files */
 210 const char *RDOFFId = RDOFF2_SIGNATURE;
 211
 212 /* Error messages. Must correspond to the codes defined in rdoff.h */
 213 const char *rdf_errors[11] = {
 214     /* 0 */ "no error occurred",
 215     /* 1 */ "could not open file",
 216     /* 2 */ "invalid file format",
 217     /* 3 */ "error reading file",
 218     /* 4 */ "unknown error",
 219     /* 5 */ "header not read",
 220     /* 6 */ "out of memory",
 221     /* 7 */ "RDOFF v1 not supported",
 222     /* 8 */ "unknown extended header record",
 223     /* 9 */ "header record of known type but unknown length",
 224     /* 10 */ "no such segment"
 225 };
 226
 227 int rdf_errno = 0;
 228
 229 /* ========================================================================
 230  * Hook for nasm_error() to work
 231  * ======================================================================== */
 232 static void rdoff_verror(int severity, const char *fmt, va_list val)
 233 {
 234     vfprintf(stderr, fmt, val);
 235
 236     if ((severity & ERR_MASK) >= ERR_FATAL)
 237         exit(1);
 238 }
 239
 240 void rdoff_init(void)
 241 {
 242     nasm_set_verror(rdoff_verror);
 243 }
 244
 245 /* ========================================================================
 246    The library functions
 247    ======================================================================== */
 248
 249 int rdfopen(rdffile * f, const char *name)
 250 {
 251     FILE *fp;
 252
 253     fp = fopen(name, "rb");
 254     if (!fp)
 255         return rdf_errno = RDF_ERR_OPEN;
 256
 257     return rdfopenhere(f, fp, NULL, name);
 258 }
 259
 260 int rdfopenhere(rdffile * f, FILE * fp, int *refcount, const char *name)
 261 {
 262     char buf[8];
 263     int32_t initpos;
 264     int32_t l;
 265     uint16_t s;
 266
 267     if (translateint32_t(0x01020304) != 0x01020304) {
 268         /* fix this to be portable! */
 269         fputs("*** this program requires a little endian machine\n",
 270               stderr);
 271         fprintf(stderr, "01020304h = %08"PRIx32"h\n", translateint32_t(0x01020304));
 272         exit(3);
 273     }
 274
 275     f->fp = fp;
 276     initpos = ftell(fp);
 277
 278     fread(buf, 6, 1, f->fp);    /* read header */
 279     buf[6] = 0;
 280
 281     if (strcmp(buf, RDOFFId)) {
 282         fclose(f->fp);
 283         if (!strcmp(buf, "RDOFF1"))
 284             return rdf_errno = RDF_ERR_VER;
 285         return rdf_errno = RDF_ERR_FORMAT;
 286     }
 287
 288     if (fread(&l, 1, 4, f->fp) != 4
 289         || fread(&f->header_len, 1, 4, f->fp) != 4) {
 290         fclose(f->fp);
 291         return rdf_errno = RDF_ERR_READ;
 292     }
 293
 294     f->header_ofs = ftell(f->fp);
 295     f->eof_offset = f->header_ofs + translateint32_t(l) - 4;
 296
 297     if (fseek(f->fp, f->header_len, SEEK_CUR)) {
 298         fclose(f->fp);
 299         return rdf_errno = RDF_ERR_FORMAT;      /* seek past end of file...? */
 300     }
 301
 302     if (fread(&s, 1, 2, f->fp) != 2) {
 303         fclose(f->fp);
 304         return rdf_errno = RDF_ERR_READ;
 305     }
 306
 307     f->nsegs = 0;
 308
 309     while (s != 0) {
 310         f->seg[f->nsegs].type = s;
 311         if (fread(&f->seg[f->nsegs].number, 1, 2, f->fp) != 2 ||
 312             fread(&f->seg[f->nsegs].reserved, 1, 2, f->fp) != 2 ||
 313             fread(&f->seg[f->nsegs].length, 1, 4, f->fp) != 4) {
 314             fclose(f->fp);
 315             return rdf_errno = RDF_ERR_READ;
 316         }
 317
 318         f->seg[f->nsegs].offset = ftell(f->fp);
 319         if (fseek(f->fp, f->seg[f->nsegs].length, SEEK_CUR)) {
 320             fclose(f->fp);
 321             return rdf_errno = RDF_ERR_FORMAT;
 322         }
 323         f->nsegs++;
 324
 325         if (fread(&s, 1, 2, f->fp) != 2) {
 326             fclose(f->fp);
 327             return rdf_errno = RDF_ERR_READ;
 328         }
 329     }
 330
 331     if (f->eof_offset != ftell(f->fp) + 8) {    /* +8 = skip null segment header */
 332         fprintf(stderr, "warning: eof_offset [%"PRId32"] and actual eof offset "
 333                 "[%ld] don't match\n", f->eof_offset, ftell(f->fp) + 8);
 334     }
 335     fseek(f->fp, initpos, SEEK_SET);
 336     f->header_loc = NULL;
 337
 338     f->name = nasm_strdup(name);
 339     f->refcount = refcount;
 340     if (refcount)
 341         (*refcount)++;
 342     return RDF_OK;
 343 }
 344
 345 int rdfclose(rdffile * f)
 346 {
 347     if (!f->refcount || !--(*f->refcount)) {
 348         fclose(f->fp);
 349         f->fp = NULL;
 350     }
 351     nasm_free(f->name);
 352
 353     return 0;
 354 }
 355
 356 /*
 357  * Print the message for last error (from rdf_errno)
 358  */
 359 void rdfperror(const char *app, const char *name)
 360 {
 361     fprintf(stderr, "%s:%s: %s\n", app, name, rdf_errors[rdf_errno]);
 362     if (rdf_errno == RDF_ERR_OPEN || rdf_errno == RDF_ERR_READ) {
 363         perror(app);
 364     }
 365 }
 366
 367 /*
 368  * Find the segment by its number.
 369  * Returns segment array index, or -1 if segment with such number was not found.
 370  */
 371 int rdffindsegment(rdffile * f, int segno)
 372 {
 373     int i;
 374     for (i = 0; i < f->nsegs; i++)
 375         if (f->seg[i].number == segno)
 376             return i;
 377     return -1;
 378 }
 379
 380 /*
 381  * Load the segment. Returns status.
 382  */
 383 int rdfloadseg(rdffile * f, int segment, void *buffer)
 384 {
 385     int32_t fpos;
 386     size_t slen;
 387
 388     switch (segment) {
 389     case RDOFF_HEADER:
 390         fpos = f->header_ofs;
 391         slen = f->header_len;
 392         f->header_loc = (uint8_t *) buffer;
 393         f->header_fp = 0;
 394         break;
 395     default:
 396         if (segment < f->nsegs) {
 397             fpos = f->seg[segment].offset;
 398             slen = f->seg[segment].length;
 399             f->seg[segment].data = (uint8_t *) buffer;
 400         } else {
 401             return rdf_errno = RDF_ERR_SEGMENT;
 402         }
 403     }
 404
 405     if (fseek(f->fp, fpos, SEEK_SET))
 406         return rdf_errno = RDF_ERR_UNKNOWN;
 407
 408     if (fread(buffer, 1, slen, f->fp) != slen)
 409         return rdf_errno = RDF_ERR_READ;
 410
 411     return RDF_OK;
 412 }
 413
 414 /* Macros for reading integers from header in memory */
 415
 416 #define RI8(v) v = f->header_loc[f->header_fp++]
 417 #define RI16(v) { v = (f->header_loc[f->header_fp] + \
 418                        (f->header_loc[f->header_fp+1] << 8)); \
 419                   f->header_fp += 2; }
 420
 421 #define RI32(v) { v = (f->header_loc[f->header_fp] + \
 422                        (f->header_loc[f->header_fp+1] << 8) + \
 423                        (f->header_loc[f->header_fp+2] << 16) + \
 424                        (f->header_loc[f->header_fp+3] << 24)); \
 425                   f->header_fp += 4; }
 426
 427 #define RS(str,max) { for(i=0;i<max;i++){\
 428   RI8(str[i]); if (!str[i]) break;} str[i]=0; }
 429
 430 /*
 431  * Read a header record.
 432  * Returns the address of record, or NULL in case of error.
 433  */
 434 rdfheaderrec *rdfgetheaderrec(rdffile * f)
 435 {
 436     static rdfheaderrec r;
 437     int i;
 438
 439     if (!f->header_loc) {
 440         rdf_errno = RDF_ERR_HEADER;
 441         return NULL;
 442     }
 443
 444     if (f->header_fp >= f->header_len)
 445         return 0;
 446
 447     RI8(r.type);
 448     RI8(r.g.reclen);
 449
 450     switch (r.type) {
 451     case RDFREC_RELOC:         /* Relocation record */
 452     case RDFREC_SEGRELOC:
 453         if (r.r.reclen != 8) {
 454             rdf_errno = RDF_ERR_RECLEN;
 455             return NULL;
 456         }
 457         RI8(r.r.segment);
 458         RI32(r.r.offset);
 459         RI8(r.r.length);
 460         RI16(r.r.refseg);
 461         break;
 462
 463     case RDFREC_IMPORT:        /* Imported symbol record */
 464     case RDFREC_FARIMPORT:
 465         RI8(r.i.flags);
 466         RI16(r.i.segment);
 467         RS(r.i.label, EXIM_LABEL_MAX);
 468         break;
 469
 470     case RDFREC_GLOBAL:        /* Exported symbol record */
 471         RI8(r.e.flags);
 472         RI8(r.e.segment);
 473         RI32(r.e.offset);
 474         RS(r.e.label, EXIM_LABEL_MAX);
 475         break;
 476
 477     case RDFREC_DLL:           /* DLL record */
 478         RS(r.d.libname, MODLIB_NAME_MAX);
 479         break;
 480
 481     case RDFREC_BSS:           /* BSS reservation record */
 482         if (r.r.reclen != 4) {
 483             rdf_errno = RDF_ERR_RECLEN;
 484             return NULL;
 485         }
 486         RI32(r.b.amount);
 487         break;
 488
 489     case RDFREC_MODNAME:       /* Module name record */
 490         RS(r.m.modname, MODLIB_NAME_MAX);
 491         break;
 492
 493     case RDFREC_COMMON:        /* Common variable */
 494         RI16(r.c.segment);
 495         RI32(r.c.size);
 496         RI16(r.c.align);
 497         RS(r.c.label, EXIM_LABEL_MAX);
 498         break;
 499
 500     default:
 501 #ifdef STRICT_ERRORS
 502         rdf_errno = RDF_ERR_RECTYPE;    /* unknown header record */
 503         return NULL;
 504 #else
 505         for (i = 0; i < r.g.reclen; i++)
 506             RI8(r.g.data[i]);
 507 #endif
 508     }
 509     return &r;
 510 }
 511
 512 /*
 513  * Rewind to the beginning of the file
 514  */
 515 void rdfheaderrewind(rdffile * f)
 516 {
 517     f->header_fp = 0;
 518 }
 519
 520 rdf_headerbuf *rdfnewheader(void)
 521 {
 522     rdf_headerbuf *hb = nasm_malloc(sizeof(rdf_headerbuf));
 523     if (hb == NULL)
 524         return NULL;
 525
 526     hb->buf = newmembuf();
 527     hb->nsegments = 0;
 528     hb->seglength = 0;
 529
 530     return hb;
 531 }
 532
 533 int rdfaddheader(rdf_headerbuf * h, rdfheaderrec * r)
 534 {
 535 #ifndef STRICT_ERRORS
 536     int i;
 537 #endif
 538     membufwrite(h->buf, &r->type, 1);
 539     membufwrite(h->buf, &r->g.reclen, 1);
 540
 541     switch (r->type) {
 542     case RDFREC_GENERIC:       /* generic */
 543         membufwrite(h->buf, &r->g.data, r->g.reclen);
 544         break;
 545     case RDFREC_RELOC:
 546     case RDFREC_SEGRELOC:
 547         membufwrite(h->buf, &r->r.segment, 1);
 548         membufwrite(h->buf, &r->r.offset, -4);
 549         membufwrite(h->buf, &r->r.length, 1);
 550         membufwrite(h->buf, &r->r.refseg, -2);  /* 9 bytes written */
 551         break;
 552
 553     case RDFREC_IMPORT:        /* import */
 554     case RDFREC_FARIMPORT:
 555         membufwrite(h->buf, &r->i.flags, 1);
 556         membufwrite(h->buf, &r->i.segment, -2);
 557         membufwrite(h->buf, &r->i.label, strlen(r->i.label) + 1);
 558         break;
 559
 560     case RDFREC_GLOBAL:        /* export */
 561         membufwrite(h->buf, &r->e.flags, 1);
 562         membufwrite(h->buf, &r->e.segment, 1);
 563         membufwrite(h->buf, &r->e.offset, -4);
 564         membufwrite(h->buf, &r->e.label, strlen(r->e.label) + 1);
 565         break;
 566
 567     case RDFREC_DLL:           /* DLL */
 568         membufwrite(h->buf, &r->d.libname, strlen(r->d.libname) + 1);
 569         break;
 570
 571     case RDFREC_BSS:           /* BSS */
 572         membufwrite(h->buf, &r->b.amount, -4);
 573         break;
 574
 575     case RDFREC_MODNAME:       /* Module name */
 576         membufwrite(h->buf, &r->m.modname, strlen(r->m.modname) + 1);
 577         break;
 578
 579     default:
 580 #ifdef STRICT_ERRORS
 581         return rdf_errno = RDF_ERR_RECTYPE;
 582 #else
 583         for (i = 0; i < r->g.reclen; i++)
 584             membufwrite(h->buf, r->g.data[i], 1);
 585 #endif
 586     }
 587     return 0;
 588 }
 589
 590 int rdfaddsegment(rdf_headerbuf * h, int32_t seglength)
 591 {
 592     h->nsegments++;
 593     h->seglength += seglength;
 594     return 0;
 595 }
 596
 597 int rdfwriteheader(FILE * fp, rdf_headerbuf * h)
 598 {
 599     int32_t l, l2;
 600
 601     nasm_write(RDOFFId, strlen(RDOFFId), fp);
 602
 603     l = membuflength(h->buf);
 604     l2 = l + 14 + 10 * h->nsegments + h->seglength;
 605     fwriteint32_t(l, fp);
 606     fwriteint32_t(l2, fp);
 607
 608     membufdump(h->buf, fp);
 609
 610     return 0;                   /* no error handling in here... CHANGE THIS! */
 611 }
 612
 613 void rdfdoneheader(rdf_headerbuf * h)
 614 {
 615     freemembuf(h->buf);
 616     nasm_free(h);
 617 }