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 #include <inttypes.h>
  50
  51 #define RDOFF_UTILS
  52
  53 #include "rdoff.h"
  54
  55 #define newstr(str) strcpy(malloc(strlen(str) + 1),str)
  56 #define newstrcat(s1,s2) strcat(strcpy(malloc(strlen(s1) + strlen(s2) + 1), \
  57                                        s1),s2)
  58
  59 /*
  60  * Comment this out to allow the module to read & write header record types
  61  * that it isn't aware of. With this defined, unrecognised header records
  62  * will generate error number 8, reported as 'unknown extended header record'.
  63  */
  64
  65 #define STRICT_ERRORS
  66
  67 /* ========================================================================
  68  * Code for memory buffers (for delayed writing of header until we know
  69  * how int32_t it is).
  70  * ======================================================================== */
  71
  72 static memorybuffer *newmembuf()
  73 {
  74     memorybuffer *t;
  75
  76     t = malloc(sizeof(memorybuffer));
  77     if (!t)
  78         return NULL;
  79
  80     t->length = 0;
  81     t->next = NULL;
  82     return t;
  83 }
  84
  85 static void membufwrite(memorybuffer * const b, void *data, int bytes)
  86 {
  87     uint16_t w;
  88     int32_t l;
  89     char *c;
  90
  91     if (b->next) {              /* memory buffer full - use next buffer */
  92         membufwrite(b->next, data, bytes);
  93         return;
  94     }
  95
  96     if ((bytes < 0 && b->length - bytes > BUF_BLOCK_LEN)
  97         || (bytes > 0 && b->length + bytes > BUF_BLOCK_LEN)) {
  98
  99         /* buffer full and no next allocated... allocate and initialise next
 100          * buffer */
 101         b->next = newmembuf();
 102         membufwrite(b->next, data, bytes);
 103         return;
 104     }
 105
 106     switch (bytes) {
 107     case -4:                   /* convert to little-endian */
 108         l = *(int32_t *)data;
 109         b->buffer[b->length++] = l & 0xFF;
 110         l >>= 8;
 111         b->buffer[b->length++] = l & 0xFF;
 112         l >>= 8;
 113         b->buffer[b->length++] = l & 0xFF;
 114         l >>= 8;
 115         b->buffer[b->length++] = l & 0xFF;
 116         break;
 117
 118     case -2:
 119         w = *(uint16_t *) data;
 120         b->buffer[b->length++] = w & 0xFF;
 121         w >>= 8;
 122         b->buffer[b->length++] = w & 0xFF;
 123         break;
 124
 125     default:
 126         c = data;
 127         while (bytes--)
 128             b->buffer[b->length++] = *c++;
 129         break;
 130     }
 131 }
 132
 133 static void membufdump(memorybuffer * b, FILE * fp)
 134 {
 135     if (!b)
 136         return;
 137
 138     fwrite(b->buffer, 1, b->length, fp);
 139
 140     membufdump(b->next, fp);
 141 }
 142
 143 static int membuflength(memorybuffer * b)
 144 {
 145     if (!b)
 146         return 0;
 147     return b->length + membuflength(b->next);
 148 }
 149
 150 static void freemembuf(memorybuffer * b)
 151 {
 152     if (!b)
 153         return;
 154     freemembuf(b->next);
 155     free(b);
 156 }
 157
 158 /* =========================================================================
 159    General purpose routines and variables used by the library functions
 160    ========================================================================= */
 161
 162 /*
 163  * translateint32_t() and translateint16_t()
 164  *
 165  * translate from little endian to local representation
 166  */
 167 int32_t translateint32_t(int32_t in)
 168 {
 169     int32_t r;
 170     uint8_t *i;
 171
 172     i = (uint8_t *)&in;
 173     r = i[3];
 174     r = (r << 8) + i[2];
 175     r = (r << 8) + i[1];
 176     r = (r << 8) + *i;
 177
 178     return r;
 179 }
 180
 181 uint16_t translateint16_t(uint16_t in)
 182 {
 183     uint16_t r;
 184     uint8_t *i;
 185
 186     i = (uint8_t *)&in;
 187     r = (i[1] << 8) + i[0];
 188
 189     return r;
 190 }
 191
 192 /* Segment types */
 193 static char *knownsegtypes[8] = {
 194     "NULL", "text", "data", "object comment",
 195     "linked comment", "loader comment",
 196     "symbolic debug", "line number debug"
 197 };
 198
 199 /* Get a textual string describing the segment type */
 200 char *translatesegmenttype(uint16_t type)
 201 {
 202     if (type < 8)
 203         return knownsegtypes[type];
 204     if (type < 0x0020)
 205         return "reserved";
 206     if (type < 0x1000)
 207         return "reserved - Moscow";
 208     if (type < 0x8000)
 209         return "reserved - system dependant";
 210     if (type < 0xFFFF)
 211         return "reserved - other";
 212     if (type == 0xFFFF)
 213         return "invalid type code";
 214     return "type code out of range";
 215 }
 216
 217 /* This signature is written to the start of RDOFF files */
 218 const char *RDOFFId = RDOFF2_SIGNATURE;
 219
 220 /* Error messages. Must correspond to the codes defined in rdoff.h */
 221 const char *rdf_errors[11] = {
 222     /* 0 */ "no error occurred",
 223     /* 1 */ "could not open file",
 224     /* 2 */ "invalid file format",
 225     /* 3 */ "error reading file",
 226     /* 4 */ "unknown error",
 227     /* 5 */ "header not read",
 228     /* 6 */ "out of memory",
 229     /* 7 */ "RDOFF v1 not supported",
 230     /* 8 */ "unknown extended header record",
 231     /* 9 */ "header record of known type but unknown length",
 232     /* 10 */ "no such segment"
 233 };
 234
 235 int rdf_errno = 0;
 236
 237 /* ========================================================================
 238    The library functions
 239    ======================================================================== */
 240
 241 int rdfopen(rdffile * f, const char *name)
 242 {
 243     FILE *fp;
 244
 245     fp = fopen(name, "rb");
 246     if (!fp)
 247         return rdf_errno = RDF_ERR_OPEN;
 248
 249     return rdfopenhere(f, fp, NULL, name);
 250 }
 251
 252 int rdfopenhere(rdffile * f, FILE * fp, int *refcount, const char *name)
 253 {
 254     char buf[8];
 255     int32_t initpos;
 256     int32_t l;
 257     uint16_t s;
 258
 259     if (translateint32_t(0x01020304) != 0x01020304) {
 260         /* fix this to be portable! */
 261         fputs("*** this program requires a little endian machine\n",
 262               stderr);
 263         fprintf(stderr, "01020304h = %08"PRIx32"h\n", translateint32_t(0x01020304));
 264         exit(3);
 265     }
 266
 267     f->fp = fp;
 268     initpos = ftell(fp);
 269
 270     fread(buf, 6, 1, f->fp);    /* read header */
 271     buf[6] = 0;
 272
 273     if (strcmp(buf, RDOFFId)) {
 274         fclose(f->fp);
 275         if (!strcmp(buf, "RDOFF1"))
 276             return rdf_errno = RDF_ERR_VER;
 277         return rdf_errno = RDF_ERR_FORMAT;
 278     }
 279
 280     if (fread(&l, 1, 4, f->fp) != 4
 281         || fread(&f->header_len, 1, 4, f->fp) != 4) {
 282         fclose(f->fp);
 283         return rdf_errno = RDF_ERR_READ;
 284     }
 285
 286     f->header_ofs = ftell(f->fp);
 287     f->eof_offset = f->header_ofs + translateint32_t(l) - 4;
 288
 289     if (fseek(f->fp, f->header_len, SEEK_CUR)) {
 290         fclose(f->fp);
 291         return rdf_errno = RDF_ERR_FORMAT;      /* seek past end of file...? */
 292     }
 293
 294     if (fread(&s, 1, 2, f->fp) != 2) {
 295         fclose(f->fp);
 296         return rdf_errno = RDF_ERR_READ;
 297     }
 298
 299     f->nsegs = 0;
 300
 301     while (s != 0) {
 302         f->seg[f->nsegs].type = s;
 303         if (fread(&f->seg[f->nsegs].number, 1, 2, f->fp) != 2 ||
 304             fread(&f->seg[f->nsegs].reserved, 1, 2, f->fp) != 2 ||
 305             fread(&f->seg[f->nsegs].length, 1, 4, f->fp) != 4) {
 306             fclose(f->fp);
 307             return rdf_errno = RDF_ERR_READ;
 308         }
 309
 310         f->seg[f->nsegs].offset = ftell(f->fp);
 311         if (fseek(f->fp, f->seg[f->nsegs].length, SEEK_CUR)) {
 312             fclose(f->fp);
 313             return rdf_errno = RDF_ERR_FORMAT;
 314         }
 315         f->nsegs++;
 316
 317         if (fread(&s, 1, 2, f->fp) != 2) {
 318             fclose(f->fp);
 319             return rdf_errno = RDF_ERR_READ;
 320         }
 321     }
 322
 323     if (f->eof_offset != ftell(f->fp) + 8) {    /* +8 = skip null segment header */
 324         fprintf(stderr, "warning: eof_offset [%"PRId32"] and actual eof offset "
 325                 "[%ld] don't match\n", f->eof_offset, ftell(f->fp) + 8);
 326     }
 327     fseek(f->fp, initpos, SEEK_SET);
 328     f->header_loc = NULL;
 329
 330     f->name = newstr(name);
 331     f->refcount = refcount;
 332     if (refcount)
 333         (*refcount)++;
 334     return RDF_OK;
 335 }
 336
 337 int rdfclose(rdffile * f)
 338 {
 339     if (!f->refcount || !--(*f->refcount)) {
 340         fclose(f->fp);
 341         f->fp = NULL;
 342     }
 343     free(f->name);
 344
 345     return 0;
 346 }
 347
 348 /*
 349  * Print the message for last error (from rdf_errno)
 350  */
 351 void rdfperror(const char *app, const char *name)
 352 {
 353     fprintf(stderr, "%s:%s: %s\n", app, name, rdf_errors[rdf_errno]);
 354     if (rdf_errno == RDF_ERR_OPEN || rdf_errno == RDF_ERR_READ) {
 355         perror(app);
 356     }
 357 }
 358
 359 /*
 360  * Find the segment by its number.
 361  * Returns segment array index, or -1 if segment with such number was not found.
 362  */
 363 int rdffindsegment(rdffile * f, int segno)
 364 {
 365     int i;
 366     for (i = 0; i < f->nsegs; i++)
 367         if (f->seg[i].number == segno)
 368             return i;
 369     return -1;
 370 }
 371
 372 /*
 373  * Load the segment. Returns status.
 374  */
 375 int rdfloadseg(rdffile * f, int segment, void *buffer)
 376 {
 377     int32_t fpos;
 378     size_t slen;
 379
 380     switch (segment) {
 381     case RDOFF_HEADER:
 382         fpos = f->header_ofs;
 383         slen = f->header_len;
 384         f->header_loc = (uint8_t *) buffer;
 385         f->header_fp = 0;
 386         break;
 387     default:
 388         if (segment < f->nsegs) {
 389             fpos = f->seg[segment].offset;
 390             slen = f->seg[segment].length;
 391             f->seg[segment].data = (uint8_t *) buffer;
 392         } else {
 393             return rdf_errno = RDF_ERR_SEGMENT;
 394         }
 395     }
 396
 397     if (fseek(f->fp, fpos, SEEK_SET))
 398         return rdf_errno = RDF_ERR_UNKNOWN;
 399
 400     if (fread(buffer, 1, slen, f->fp) != slen)
 401         return rdf_errno = RDF_ERR_READ;
 402
 403     return RDF_OK;
 404 }
 405
 406 /* Macros for reading integers from header in memory */
 407
 408 #define RI8(v) v = f->header_loc[f->header_fp++]
 409 #define RI16(v) { v = (f->header_loc[f->header_fp] + \
 410                        (f->header_loc[f->header_fp+1] << 8)); \
 411                   f->header_fp += 2; }
 412
 413 #define RI32(v) { v = (f->header_loc[f->header_fp] + \
 414                        (f->header_loc[f->header_fp+1] << 8) + \
 415                        (f->header_loc[f->header_fp+2] << 16) + \
 416                        (f->header_loc[f->header_fp+3] << 24)); \
 417                   f->header_fp += 4; }
 418
 419 #define RS(str,max) { for(i=0;i<max;i++){\
 420   RI8(str[i]); if (!str[i]) break;} str[i]=0; }
 421
 422 /*
 423  * Read a header record.
 424  * Returns the address of record, or NULL in case of error.
 425  */
 426 rdfheaderrec *rdfgetheaderrec(rdffile * f)
 427 {
 428     static rdfheaderrec r;
 429     int i;
 430
 431     if (!f->header_loc) {
 432         rdf_errno = RDF_ERR_HEADER;
 433         return NULL;
 434     }
 435
 436     if (f->header_fp >= f->header_len)
 437         return 0;
 438
 439     RI8(r.type);
 440     RI8(r.g.reclen);
 441
 442     switch (r.type) {
 443     case RDFREC_RELOC:         /* Relocation record */
 444     case RDFREC_SEGRELOC:
 445         if (r.r.reclen != 8) {
 446             rdf_errno = RDF_ERR_RECLEN;
 447             return NULL;
 448         }
 449         RI8(r.r.segment);
 450         RI32(r.r.offset);
 451         RI8(r.r.length);
 452         RI16(r.r.refseg);
 453         break;
 454
 455     case RDFREC_IMPORT:        /* Imported symbol record */
 456     case RDFREC_FARIMPORT:
 457         RI8(r.i.flags);
 458         RI16(r.i.segment);
 459         RS(r.i.label, EXIM_LABEL_MAX);
 460         break;
 461
 462     case RDFREC_GLOBAL:        /* Exported symbol record */
 463         RI8(r.e.flags);
 464         RI8(r.e.segment);
 465         RI32(r.e.offset);
 466         RS(r.e.label, EXIM_LABEL_MAX);
 467         break;
 468
 469     case RDFREC_DLL:           /* DLL record */
 470         RS(r.d.libname, MODLIB_NAME_MAX);
 471         break;
 472
 473     case RDFREC_BSS:           /* BSS reservation record */
 474         if (r.r.reclen != 4) {
 475             rdf_errno = RDF_ERR_RECLEN;
 476             return NULL;
 477         }
 478         RI32(r.b.amount);
 479         break;
 480
 481     case RDFREC_MODNAME:       /* Module name record */
 482         RS(r.m.modname, MODLIB_NAME_MAX);
 483         break;
 484
 485     case RDFREC_COMMON:        /* Common variable */
 486         RI16(r.c.segment);
 487         RI32(r.c.size);
 488         RI16(r.c.align);
 489         RS(r.c.label, EXIM_LABEL_MAX);
 490         break;
 491
 492     default:
 493 #ifdef STRICT_ERRORS
 494         rdf_errno = RDF_ERR_RECTYPE;    /* unknown header record */
 495         return NULL;
 496 #else
 497         for (i = 0; i < r.g.reclen; i++)
 498             RI8(r.g.data[i]);
 499 #endif
 500     }
 501     return &r;
 502 }
 503
 504 /*
 505  * Rewind to the beginning of the file
 506  */
 507 void rdfheaderrewind(rdffile * f)
 508 {
 509     f->header_fp = 0;
 510 }
 511
 512 rdf_headerbuf *rdfnewheader(void)
 513 {
 514     rdf_headerbuf *hb = malloc(sizeof(rdf_headerbuf));
 515     if (hb == NULL)
 516         return NULL;
 517
 518     hb->buf = newmembuf();
 519     hb->nsegments = 0;
 520     hb->seglength = 0;
 521
 522     return hb;
 523 }
 524
 525 int rdfaddheader(rdf_headerbuf * h, rdfheaderrec * r)
 526 {
 527 #ifndef STRICT_ERRORS
 528     int i;
 529 #endif
 530     membufwrite(h->buf, &r->type, 1);
 531     membufwrite(h->buf, &r->g.reclen, 1);
 532
 533     switch (r->type) {
 534     case RDFREC_GENERIC:       /* generic */
 535         membufwrite(h->buf, &r->g.data, r->g.reclen);
 536         break;
 537     case RDFREC_RELOC:
 538     case RDFREC_SEGRELOC:
 539         membufwrite(h->buf, &r->r.segment, 1);
 540         membufwrite(h->buf, &r->r.offset, -4);
 541         membufwrite(h->buf, &r->r.length, 1);
 542         membufwrite(h->buf, &r->r.refseg, -2);  /* 9 bytes written */
 543         break;
 544
 545     case RDFREC_IMPORT:        /* import */
 546     case RDFREC_FARIMPORT:
 547         membufwrite(h->buf, &r->i.flags, 1);
 548         membufwrite(h->buf, &r->i.segment, -2);
 549         membufwrite(h->buf, &r->i.label, strlen(r->i.label) + 1);
 550         break;
 551
 552     case RDFREC_GLOBAL:        /* export */
 553         membufwrite(h->buf, &r->e.flags, 1);
 554         membufwrite(h->buf, &r->e.segment, 1);
 555         membufwrite(h->buf, &r->e.offset, -4);
 556         membufwrite(h->buf, &r->e.label, strlen(r->e.label) + 1);
 557         break;
 558
 559     case RDFREC_DLL:           /* DLL */
 560         membufwrite(h->buf, &r->d.libname, strlen(r->d.libname) + 1);
 561         break;
 562
 563     case RDFREC_BSS:           /* BSS */
 564         membufwrite(h->buf, &r->b.amount, -4);
 565         break;
 566
 567     case RDFREC_MODNAME:       /* Module name */
 568         membufwrite(h->buf, &r->m.modname, strlen(r->m.modname) + 1);
 569         break;
 570
 571     default:
 572 #ifdef STRICT_ERRORS
 573         return rdf_errno = RDF_ERR_RECTYPE;
 574 #else
 575         for (i = 0; i < r->g.reclen; i++)
 576             membufwrite(h->buf, r->g.data[i], 1);
 577 #endif
 578     }
 579     return 0;
 580 }
 581
 582 int rdfaddsegment(rdf_headerbuf * h, int32_t seglength)
 583 {
 584     h->nsegments++;
 585     h->seglength += seglength;
 586     return 0;
 587 }
 588
 589 int rdfwriteheader(FILE * fp, rdf_headerbuf * h)
 590 {
 591     int32_t l, l2;
 592
 593     fwrite(RDOFFId, 1, strlen(RDOFFId), fp);
 594
 595     l = membuflength(h->buf);
 596     l2 = l + 14 + 10 * h->nsegments + h->seglength;
 597     l = translateint32_t(l);
 598     l2 = translateint32_t(l2);
 599     fwrite(&l2, 4, 1, fp);      /* object length */
 600     fwrite(&l, 4, 1, fp);       /* header length */
 601
 602     membufdump(h->buf, fp);
 603
 604     return 0;                   /* no error handling in here... CHANGE THIS! */
 605 }
 606
 607 void rdfdoneheader(rdf_headerbuf * h)
 608 {
 609     freemembuf(h->buf);
 610     free(h);
 611 }