output/codeview.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2017 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  * codeview.c Codeview Debug Format support for COFF
  36  */
  37
  38 #include "version.h"
  39 #include "compiler.h"
  40
  41 #include <stdio.h>
  42 #include <stddef.h>
  43 #include <stdlib.h>
  44
  45 #include "nasm.h"
  46 #include "nasmlib.h"
  47 #include "error.h"
  48 #include "preproc.h"
  49 #include "saa.h"
  50 #include "hashtbl.h"
  51 #include "outlib.h"
  52 #include "pecoff.h"
  53 #include "md5.h"
  54
  55 static void cv8_init(void);
  56 static void cv8_linenum(const char *filename, int32_t linenumber,
  57         int32_t segto);
  58 static void cv8_deflabel(char *name, int32_t segment, int64_t offset,
  59         int is_global, char *special);
  60 static void cv8_typevalue(int32_t type);
  61 static void cv8_output(int type, void *param);
  62 static void cv8_cleanup(void);
  63
  64 const struct dfmt df_cv8 = {
  65     "Codeview 8",               /* .fullname */
  66     "cv8",                      /* .shortname */
  67     cv8_init,                   /* .init */
  68     cv8_linenum,                /* .linenum */
  69     cv8_deflabel,               /* .debug_deflabel */
  70     null_debug_directive,       /* .debug_directive */
  71     cv8_typevalue,              /* .debug_typevalue */
  72     cv8_output,                 /* .debug_output */
  73     cv8_cleanup,                /* .cleanup */
  74     NULL                        /* pragma list */
  75 };
  76
  77 /*******************************************************************************
  78  * dfmt callbacks
  79  ******************************************************************************/
  80 struct source_file;
  81
  82 struct source_file {
  83     const char *filename;
  84     char *fullname;
  85     uint32_t fullnamelen;
  86
  87     struct source_file *next;
  88
  89     uint32_t filetbl_off;
  90     uint32_t sourcetbl_off;
  91
  92     struct SAA *lines;
  93     uint32_t num_lines;
  94
  95     unsigned char md5sum[MD5_HASHBYTES];
  96 };
  97
  98 struct linepair {
  99     uint32_t file_offset;
 100     uint32_t linenumber;
 101 };
 102
 103 enum symbol_type {
 104     SYMTYPE_CODE,
 105     SYMTYPE_PROC,
 106     SYMTYPE_LDATA,
 107     SYMTYPE_GDATA,
 108
 109     SYMTYPE_MAX
 110 };
 111
 112 struct cv8_symbol {
 113     enum symbol_type type;
 114     char *name;
 115
 116     uint32_t secrel;
 117     uint16_t section;
 118     uint32_t size;
 119     uint32_t typeindex;
 120
 121     enum symtype {
 122         TYPE_UNREGISTERED = 0x0000, /* T_NOTYPE */
 123         TYPE_BYTE = 0x0020,
 124         TYPE_WORD = 0x0021,
 125         TYPE_DWORD= 0x0022,
 126         TYPE_QUAD = 0x0023,
 127
 128         TYPE_REAL32 = 0x0040,
 129         TYPE_REAL64 = 0x0041,
 130         TYPE_REAL80 = 0x0042,
 131         TYPE_REAL128= 0x0043,
 132         TYPE_REAL256= 0x0044,
 133         TYPE_REAL512= 0x0045
 134     } symtype;
 135 };
 136
 137 struct cv8_state {
 138     int symbol_sect;
 139     int type_sect;
 140
 141     uint32_t text_offset;
 142
 143     struct source_file *source_files, **source_files_tail;
 144     const char *last_filename;
 145     struct source_file *last_source_file;
 146     struct hash_table file_hash;
 147     unsigned num_files;
 148     uint32_t total_filename_len;
 149
 150
 151     unsigned total_lines;
 152
 153     struct SAA *symbols;
 154     struct cv8_symbol *last_sym;
 155     unsigned num_syms[SYMTYPE_MAX];
 156     unsigned symbol_lengths;
 157     unsigned total_syms;
 158
 159     struct {
 160         char *name;
 161         size_t namebytes;
 162     } outfile;
 163 };
 164 struct cv8_state cv8_state;
 165
 166 static void cv8_init(void)
 167 {
 168     const uint32_t sect_flags =     IMAGE_SCN_MEM_READ |
 169                     IMAGE_SCN_MEM_DISCARDABLE |
 170                     IMAGE_SCN_CNT_INITIALIZED_DATA |
 171                     IMAGE_SCN_ALIGN_1BYTES;
 172
 173     cv8_state.symbol_sect = coff_make_section(".debug$S", sect_flags);
 174     cv8_state.type_sect = coff_make_section(".debug$T", sect_flags);
 175
 176     cv8_state.text_offset = 0;
 177
 178     cv8_state.source_files = NULL;
 179     cv8_state.source_files_tail = &cv8_state.source_files;
 180     hash_init(&cv8_state.file_hash, HASH_MEDIUM);
 181
 182     cv8_state.num_files = 0;
 183     cv8_state.total_filename_len = 0;
 184
 185     cv8_state.total_lines = 0;
 186
 187     cv8_state.symbols = saa_init(sizeof(struct cv8_symbol));
 188     cv8_state.last_sym = NULL;
 189 }
 190
 191 static struct source_file *register_file(const char *filename);
 192 static struct coff_Section *find_section(int32_t segto);
 193
 194 static void cv8_linenum(const char *filename, int32_t linenumber,
 195         int32_t segto)
 196 {
 197     struct coff_Section *s;
 198     struct linepair *li;
 199     struct source_file *file;
 200
 201     file = register_file(filename);
 202
 203     s = find_section(segto);
 204     if (s == NULL)
 205         return;
 206
 207     if ((s->flags & IMAGE_SCN_MEM_EXECUTE) == 0)
 208         return;
 209
 210     li = saa_wstruct(file->lines);
 211     li->file_offset = cv8_state.text_offset;
 212     li->linenumber = linenumber;
 213
 214     file->num_lines++;
 215     cv8_state.total_lines++;
 216 }
 217
 218 static void cv8_deflabel(char *name, int32_t segment, int64_t offset,
 219         int is_global, char *special)
 220 {
 221     struct cv8_symbol *sym;
 222     struct coff_Section *s;
 223
 224     (void)special;
 225
 226     s = find_section(segment);
 227     if (s == NULL)
 228         return;
 229
 230     sym = saa_wstruct(cv8_state.symbols);
 231
 232     if (s->flags & IMAGE_SCN_MEM_EXECUTE)
 233         sym->type = is_global ? SYMTYPE_PROC : SYMTYPE_CODE;
 234     else
 235         sym->type = is_global ?  SYMTYPE_GDATA : SYMTYPE_LDATA;
 236     cv8_state.num_syms[sym->type]++;
 237     cv8_state.total_syms++;
 238
 239     sym->section = segment;
 240     sym->secrel = offset;
 241     sym->symtype = TYPE_UNREGISTERED;
 242     sym->size = 0;
 243     sym->typeindex = 0;
 244
 245     sym->name = nasm_strdup(name);
 246     cv8_state.symbol_lengths += strlen(sym->name) + 1;
 247
 248     if (cv8_state.last_sym && cv8_state.last_sym->section == segment)
 249         cv8_state.last_sym->size = offset - cv8_state.last_sym->secrel;
 250     cv8_state.last_sym = sym;
 251 }
 252
 253 static void cv8_typevalue(int32_t type)
 254 {
 255     if (!cv8_state.last_sym)
 256         return;
 257     if (cv8_state.last_sym->symtype != TYPE_UNREGISTERED)
 258         return;
 259
 260     switch (TYM_TYPE(type)) {
 261     case TY_BYTE:
 262         cv8_state.last_sym->symtype = TYPE_BYTE;
 263         break;
 264     case TY_WORD:
 265         cv8_state.last_sym->symtype = TYPE_WORD;
 266         break;
 267     case TY_DWORD:
 268         cv8_state.last_sym->symtype = TYPE_DWORD;
 269         break;
 270     case TY_QWORD:
 271         cv8_state.last_sym->symtype = TYPE_QUAD;
 272         break;
 273     case TY_FLOAT:
 274         cv8_state.last_sym->symtype = TYPE_REAL32;
 275         break;
 276     case TY_TBYTE:
 277         cv8_state.last_sym->symtype = TYPE_REAL80;
 278         break;
 279     case TY_OWORD:
 280         cv8_state.last_sym->symtype = TYPE_REAL128;
 281         break;
 282     case TY_YWORD:
 283         cv8_state.last_sym->symtype = TYPE_REAL256;
 284         break;
 285     case TY_UNKNOWN:
 286         break;
 287     case TY_LABEL:
 288         break;
 289     }
 290 }
 291
 292 static void cv8_output(int type, void *param)
 293 {
 294     struct coff_DebugInfo *dinfo = param;
 295
 296     (void)type;
 297
 298     if (dinfo->section && dinfo->section->name &&
 299     !strncmp(dinfo->section->name, ".text", 5))
 300         cv8_state.text_offset += dinfo->size;
 301 }
 302
 303 static void build_symbol_table(struct coff_Section *const sect);
 304 static void build_type_table(struct coff_Section *const sect);
 305
 306 static void cv8_cleanup(void)
 307 {
 308     struct cv8_symbol *sym;
 309     struct source_file *file;
 310
 311     struct coff_Section *symbol_sect = coff_sects[cv8_state.symbol_sect];
 312     struct coff_Section *type_sect = coff_sects[cv8_state.type_sect];
 313
 314     cv8_state.outfile.name = nasm_realpath(coff_outfile);
 315     cv8_state.outfile.namebytes = strlen(cv8_state.outfile.name) + 1;
 316
 317     build_symbol_table(symbol_sect);
 318     build_type_table(type_sect);
 319
 320     list_for_each(file, cv8_state.source_files) {
 321         nasm_free(file->fullname);
 322         saa_free(file->lines);
 323         free(file);
 324     }
 325     hash_free(&cv8_state.file_hash);
 326
 327     saa_rewind(cv8_state.symbols);
 328     while ((sym = saa_rstruct(cv8_state.symbols)))
 329         nasm_free(sym->name);
 330     saa_free(cv8_state.symbols);
 331
 332     nasm_free(cv8_state.outfile.name);
 333 }
 334
 335 /*******************************************************************************
 336  * implementation
 337  ******************************************************************************/
 338 static void calc_md5(const char *const filename,
 339         unsigned char sum[MD5_HASHBYTES])
 340 {
 341     int success = 0;
 342     unsigned char *file_buf;
 343     FILE *f;
 344     MD5_CTX ctx;
 345
 346     f = pp_input_fopen(filename, NF_BINARY);
 347     if (!f)
 348         goto done;
 349
 350     file_buf = nasm_zalloc(BUFSIZ);
 351
 352     MD5Init(&ctx);
 353     while (!feof(f)) {
 354         size_t i = fread(file_buf, 1, BUFSIZ, f);
 355         if (ferror(f))
 356             goto done_0;
 357         else if (i == 0)
 358             break;
 359         MD5Update(&ctx, file_buf, i);
 360     }
 361     MD5Final(sum, &ctx);
 362
 363     success = 1;
 364 done_0:
 365     nasm_free(file_buf);
 366     fclose(f);
 367 done:
 368     if (!success) {
 369         nasm_error(ERR_NONFATAL, "unable to hash file %s. "
 370                  "Debug information may be unavailable.\n",
 371                  filename);
 372     }
 373     return;
 374 }
 375
 376 static struct source_file *register_file(const char *filename)
 377 {
 378     struct source_file *file;
 379     void **filep;
 380     char *fullpath;
 381     struct hash_insert hi;
 382
 383     /*
 384      * The common case is that we are invoked with the same filename
 385      * as we were last time.  Make this a pointer comparison: this is
 386      * safe because the NASM core code allocates each filename once
 387      * and never frees it.
 388      */
 389     if (likely(cv8_state.last_filename == filename))
 390         return cv8_state.last_source_file;
 391
 392     cv8_state.last_filename = filename;
 393
 394     filep = hash_find(&cv8_state.file_hash, filename, &hi);
 395     if (likely(filep)) {
 396         file = *filep;
 397     } else {
 398         /* New filename encounter */
 399
 400         fullpath = nasm_realpath(filename);
 401
 402         file = nasm_zalloc(sizeof(*file));
 403
 404         file->filename = filename;
 405         file->fullname = fullpath;
 406         file->fullnamelen = strlen(fullpath);
 407         file->lines = saa_init(sizeof(struct linepair));
 408         *cv8_state.source_files_tail = file;
 409         cv8_state.source_files_tail = &file->next;
 410         calc_md5(fullpath, file->md5sum);
 411
 412         hash_add(&hi, filename, file);
 413
 414         cv8_state.num_files++;
 415         cv8_state.total_filename_len += file->fullnamelen + 1;
 416     }
 417
 418     cv8_state.last_source_file = file;
 419     return file;
 420 }
 421
 422 static struct coff_Section *find_section(int32_t segto)
 423 {
 424     int i;
 425
 426     for (i = 0; i < coff_nsects; i++) {
 427         struct coff_Section *sec;
 428
 429         sec = coff_sects[i];
 430         if (segto == sec->index)
 431             return sec;
 432     }
 433     return NULL;
 434 }
 435
 436 static void register_reloc(struct coff_Section *const sect,
 437         char *sym, uint32_t addr, uint16_t type)
 438 {
 439     struct coff_Reloc *r;
 440     struct coff_Section *sec;
 441     uint32_t i;
 442
 443     r = *sect->tail = nasm_malloc(sizeof(struct coff_Reloc));
 444     sect->tail = &r->next;
 445     r->next = NULL;
 446     sect->nrelocs++;
 447
 448     r->address = addr;
 449     r->symbase = SECT_SYMBOLS;
 450     r->type = type;
 451
 452     r->symbol = 0;
 453     for (i = 0; i < (uint32_t)coff_nsects; i++) {
 454         sec = coff_sects[i];
 455         if (!strcmp(sym, sec->name)) {
 456             return;
 457         }
 458         r->symbol += 2;
 459     }
 460
 461     saa_rewind(coff_syms);
 462     for (i = 0; i < coff_nsyms; i++) {
 463         struct coff_Symbol *s = saa_rstruct(coff_syms);
 464         r->symbol++;
 465         if (s->strpos == -1 && !strcmp(sym, s->name)) {
 466             return;
 467         } else if (s->strpos != -1) {
 468             int res;
 469             char *symname;
 470
 471             symname = nasm_malloc(s->namlen + 1);
 472             saa_fread(coff_strs, s->strpos-4, symname, s->namlen);
 473             symname[s->namlen] = '\0';
 474             res = strcmp(sym, symname);
 475             nasm_free(symname);
 476             if (!res)
 477                 return;
 478         }
 479     }
 480     nasm_panic(0, "codeview: relocation for unregistered symbol: %s", sym);
 481 }
 482
 483 static inline void section_write32(struct coff_Section *sect, uint32_t val)
 484 {
 485     saa_write32(sect->data, val);
 486     sect->len += 4;
 487 }
 488
 489 static inline void section_write16(struct coff_Section *sect, uint16_t val)
 490 {
 491     saa_write16(sect->data, val);
 492     sect->len += 2;
 493 }
 494
 495 static inline void section_write8(struct coff_Section *sect, uint8_t val)
 496 {
 497     saa_write8(sect->data, val);
 498     sect->len++;
 499 }
 500
 501 static inline void section_wbytes(struct coff_Section *sect, const void *buf,
 502         size_t len)
 503 {
 504     saa_wbytes(sect->data, buf, len);
 505     sect->len += len;
 506 }
 507
 508 static void write_filename_table(struct coff_Section *const sect)
 509 {
 510     uint32_t field_length;
 511     uint32_t tbl_off = 1;    /* offset starts at 1 to skip NULL entry */
 512     struct source_file *file;
 513
 514     nasm_assert(cv8_state.source_files != NULL);
 515     nasm_assert(cv8_state.num_files > 0);
 516     nasm_assert(cv8_state.total_filename_len > 0);
 517
 518     field_length = 1 + cv8_state.total_filename_len;
 519
 520     section_write32(sect, 0x000000F3);
 521     section_write32(sect, field_length);
 522
 523     section_write8(sect, 0);
 524
 525     list_for_each(file, cv8_state.source_files) {
 526         section_wbytes(sect, file->fullname, file->fullnamelen + 1);
 527         file->filetbl_off = tbl_off;
 528         tbl_off += file->fullnamelen + 1;
 529     }
 530 }
 531
 532 static void write_sourcefile_table(struct coff_Section *const sect)
 533 {
 534     const uint32_t entry_size = 4 + 2 + MD5_HASHBYTES + 2;
 535
 536     uint32_t field_length = 0;
 537     uint32_t tbl_off = 0;
 538     struct source_file *file;
 539
 540     field_length = entry_size * cv8_state.num_files;
 541
 542     section_write32(sect, 0x000000F4);
 543     section_write32(sect, field_length);
 544
 545     list_for_each(file, cv8_state.source_files) {
 546         nasm_assert(file->filetbl_off > 0);
 547         section_write32(sect, file->filetbl_off);
 548         section_write16(sect, 0x0110);
 549         section_wbytes(sect, file->md5sum, MD5_HASHBYTES);
 550         section_write16(sect, 0);
 551
 552         file->sourcetbl_off = tbl_off;
 553         tbl_off += entry_size;
 554     }
 555 }
 556
 557 static void write_linenumber_table(struct coff_Section *const sect)
 558 {
 559     const uint32_t file_field_len = 12;
 560     const uint32_t line_field_len = 8;
 561
 562     int i;
 563     uint32_t field_length = 0;
 564     size_t field_base;
 565     struct source_file *file;
 566     struct coff_Section *s;
 567
 568     for (i = 0; i < coff_nsects; i++) {
 569         if (!strncmp(coff_sects[i]->name, ".text", 5))
 570             break;
 571     }
 572
 573     if (i == coff_nsects)
 574         return;
 575     s = coff_sects[i];
 576
 577     field_length = 12;
 578     field_length += (cv8_state.num_files * file_field_len);
 579     field_length += (cv8_state.total_lines * line_field_len);
 580
 581     section_write32(sect, 0x000000F2);
 582     section_write32(sect, field_length);
 583
 584     field_base = sect->len;
 585     section_write32(sect, 0); /* SECREL, updated by relocation */
 586     section_write16(sect, 0); /* SECTION, updated by relocation*/
 587     section_write16(sect, 0); /* pad */
 588     section_write32(sect, s->len);
 589
 590     register_reloc(sect, ".text", field_base,
 591         win64 ? IMAGE_REL_AMD64_SECREL : IMAGE_REL_I386_SECREL);
 592
 593     register_reloc(sect, ".text", field_base + 4,
 594         win64 ? IMAGE_REL_AMD64_SECTION : IMAGE_REL_I386_SECTION);
 595
 596     list_for_each(file, cv8_state.source_files) {
 597         struct linepair *li;
 598
 599         /* source mapping */
 600         section_write32(sect, file->sourcetbl_off);
 601         section_write32(sect, file->num_lines);
 602         section_write32(sect, file_field_len + (file->num_lines * line_field_len));
 603
 604         /* the pairs */
 605         saa_rewind(file->lines);
 606         while ((li = saa_rstruct(file->lines))) {
 607             section_write32(sect, li->file_offset);
 608             section_write32(sect, li->linenumber |= 0x80000000);
 609         }
 610     }
 611 }
 612
 613 static uint16_t write_symbolinfo_obj(struct coff_Section *sect)
 614 {
 615     uint16_t obj_len;
 616
 617     obj_len = 2 + 4 + cv8_state.outfile.namebytes;
 618
 619     section_write16(sect, obj_len);
 620     section_write16(sect, 0x1101);
 621     section_write32(sect, 0); /* ASM language */
 622     section_wbytes(sect, cv8_state.outfile.name, cv8_state.outfile.namebytes);
 623
 624     return obj_len;
 625 }
 626
 627 static uint16_t write_symbolinfo_properties(struct coff_Section *sect,
 628         const char *const creator_str)
 629 {
 630     /* https://github.com/Microsoft/microsoft-pdb/blob/1d60e041/include/cvinfo.h#L3313 */
 631     uint16_t creator_len;
 632
 633     creator_len = 2 + 4 + 2 + 3*2 + 3*2 + strlen(creator_str)+1 + 2;
 634
 635     section_write16(sect, creator_len);
 636     section_write16(sect, 0x1116);
 637     section_write32(sect, 3); /* language/flags */
 638     if (win64)
 639         section_write16(sect, 0x00D0); /* machine */
 640     else if (win32)
 641         section_write16(sect, 0x0006); /* machine */
 642     else
 643         nasm_assert(!"neither win32 nor win64 are set!");
 644     section_write16(sect, 0); /* verFEMajor */
 645     section_write16(sect, 0); /* verFEMinor */
 646     section_write16(sect, 0); /* verFEBuild */
 647
 648     /* BinScope/WACK insist on version >= 8.0.50727 */
 649     section_write16(sect, 8); /* verMajor */
 650     section_write16(sect, 0); /* verMinor */
 651     section_write16(sect, 50727); /* verBuild */
 652
 653     section_wbytes(sect, creator_str, strlen(creator_str)+1); /* verSt */
 654     /*
 655      * normally there would be key/value pairs here, but they aren't
 656      * necessary. They are terminated by 2B
 657      */
 658     section_write16(sect, 0);
 659
 660     return creator_len;
 661 }
 662
 663 static uint16_t write_symbolinfo_symbols(struct coff_Section *sect)
 664 {
 665     uint16_t len = 0, field_len;
 666     uint32_t field_base;
 667     struct cv8_symbol *sym;
 668
 669     saa_rewind(cv8_state.symbols);
 670     while ((sym = saa_rstruct(cv8_state.symbols))) {
 671         switch (sym->type) {
 672         case SYMTYPE_LDATA:
 673         case SYMTYPE_GDATA:
 674             field_len = 12 + strlen(sym->name) + 1;
 675             len += field_len - 2;
 676             section_write16(sect, field_len);
 677             if (sym->type == SYMTYPE_LDATA)
 678                 section_write16(sect, 0x110C);
 679             else
 680                 section_write16(sect, 0x110D);
 681             section_write32(sect, sym->symtype);
 682
 683             field_base = sect->len;
 684             section_write32(sect, 0); /* SECREL */
 685             section_write16(sect, 0); /* SECTION */
 686             break;
 687         case SYMTYPE_PROC:
 688         case SYMTYPE_CODE:
 689             field_len = 9 + strlen(sym->name) + 1;
 690             len += field_len - 2;
 691             section_write16(sect, field_len);
 692             section_write16(sect, 0x1105);
 693
 694             field_base = sect->len;
 695             section_write32(sect, 0); /* SECREL */
 696             section_write16(sect, 0); /* SECTION */
 697             section_write8(sect, 0); /* FLAG */
 698             break;
 699         default:
 700             nasm_assert(!"unknown symbol type");
 701         }
 702
 703         section_wbytes(sect, sym->name, strlen(sym->name) + 1);
 704
 705         register_reloc(sect, sym->name, field_base,
 706             win64 ? IMAGE_REL_AMD64_SECREL :
 707                 IMAGE_REL_I386_SECREL);
 708         register_reloc(sect, sym->name, field_base + 4,
 709             win64 ? IMAGE_REL_AMD64_SECTION :
 710                 IMAGE_REL_I386_SECTION);
 711     }
 712
 713     return len;
 714 }
 715
 716 static void write_symbolinfo_table(struct coff_Section *const sect)
 717 {
 718     static const char creator_str[] = "The Netwide Assembler " NASM_VER;
 719     uint16_t obj_length, creator_length, sym_length;
 720     uint32_t field_length = 0, out_len;
 721
 722     nasm_assert(cv8_state.outfile.namebytes);
 723
 724     /* signature, language, outfile NULL */
 725     obj_length = 2 + 4 + cv8_state.outfile.namebytes;
 726     creator_length = 2 + 4 + 2 + 3*2 + 3*2 + strlen(creator_str)+1 + 2;
 727
 728     sym_length =    ( cv8_state.num_syms[SYMTYPE_CODE] *  7) +
 729             ( cv8_state.num_syms[SYMTYPE_PROC] *  7) +
 730             ( cv8_state.num_syms[SYMTYPE_LDATA] * 10) +
 731             ( cv8_state.num_syms[SYMTYPE_GDATA] * 10) +
 732             cv8_state.symbol_lengths;
 733
 734     field_length = 2 + obj_length +
 735                2 + creator_length +
 736                (4 * cv8_state.total_syms) + sym_length;
 737
 738     section_write32(sect, 0x000000F1);
 739     section_write32(sect, field_length);
 740
 741     /* for sub fields, length preceeds type */
 742
 743     out_len = write_symbolinfo_obj(sect);
 744     nasm_assert(out_len == obj_length);
 745
 746     out_len = write_symbolinfo_properties(sect, creator_str);
 747     nasm_assert(out_len == creator_length);
 748
 749     out_len = write_symbolinfo_symbols(sect);
 750     nasm_assert(out_len == sym_length);
 751 }
 752
 753 static inline void align4_table(struct coff_Section *const sect)
 754 {
 755     unsigned diff;
 756     uint32_t zero = 0;
 757     struct SAA *data = sect->data;
 758
 759     if (data->wptr % 4 == 0)
 760         return;
 761
 762     diff = 4 - (data->wptr % 4);
 763     if (diff)
 764         section_wbytes(sect, &zero, diff);
 765 }
 766
 767 static void build_symbol_table(struct coff_Section *const sect)
 768 {
 769     section_write32(sect, 0x00000004);
 770
 771     write_filename_table(sect);
 772     align4_table(sect);
 773     write_sourcefile_table(sect);
 774     align4_table(sect);
 775     write_linenumber_table(sect);
 776     align4_table(sect);
 777     write_symbolinfo_table(sect);
 778     align4_table(sect);
 779 }
 780
 781 static void build_type_table(struct coff_Section *const sect)
 782 {
 783     uint16_t field_len;
 784     struct cv8_symbol *sym;
 785
 786     section_write32(sect, 0x00000004);
 787
 788     saa_rewind(cv8_state.symbols);
 789     while ((sym = saa_rstruct(cv8_state.symbols))) {
 790         if (sym->type != SYMTYPE_PROC)
 791             continue;
 792
 793         /* proc leaf */
 794
 795         field_len = 2 + 4 + 4 + 4 + 2;
 796         section_write16(sect, field_len);
 797         section_write16(sect, 0x1008); /* PROC type */
 798
 799         section_write32(sect, 0x00000003); /* return type */
 800         section_write32(sect, 0); /* calling convention (default) */
 801         section_write32(sect, sym->typeindex);
 802         section_write16(sect, 0); /* # params */
 803
 804         /* arglist */
 805
 806         field_len = 2 + 4;
 807         section_write16(sect, field_len);
 808         section_write16(sect, 0x1201); /* ARGLIST */
 809         section_write32(sect, 0); /*num params */
 810     }
 811 }