mono/mini/image-writer.c

   1 /*
   2  * image-writer.c: Creation of object files or assembly files using the same interface.
   3  *
   4  * Author:
   5  *   Dietmar Maurer (dietmar@ximian.com)
   6  *   Zoltan Varga (vargaz@gmail.com)
   7  *   Paolo Molaro (lupus@ximian.com)
   8  *
   9  * (C) 2002 Ximian, Inc.
  10  */
  11
  12 #include "config.h"
  13 #include <sys/types.h>
  14 #ifdef HAVE_UNISTD_H
  15 #include <unistd.h>
  16 #endif
  17 #ifdef HAVE_STDINT_H
  18 #include <stdint.h>
  19 #endif
  20 #include <fcntl.h>
  21 #include <ctype.h>
  22 #include <string.h>
  23 #ifndef PLATFORM_WIN32
  24 #include <sys/time.h>
  25 #else
  26 #include <winsock2.h>
  27 #include <windows.h>
  28 #endif
  29
  30 #include <errno.h>
  31 #include <sys/stat.h>
  32 #include <limits.h>    /* for PAGESIZE */
  33 #ifndef PAGESIZE
  34 #define PAGESIZE 4096
  35 #endif
  36
  37 #include "image-writer.h"
  38
  39 #ifndef PLATFORM_WIN32
  40 #include <mono/utils/freebsd-elf32.h>
  41 #include <mono/utils/freebsd-elf64.h>
  42 #endif
  43
  44 #include "mini.h"
  45
  46 #define TV_DECLARE(name) gint64 name
  47 #define TV_GETTIME(tv) tv = mono_100ns_ticks ()
  48 #define TV_ELAPSED(start,end) (((end) - (start)) / 10)
  49
  50 #ifdef PLATFORM_WIN32
  51 #define SHARED_EXT ".dll"
  52 #elif defined(__ppc__) && defined(__MACH__)
  53 #define SHARED_EXT ".dylib"
  54 #else
  55 #define SHARED_EXT ".so"
  56 #endif
  57
  58 #if defined(sparc) || defined(__ppc__) || defined(__powerpc__) || defined(__MACH__)
  59 #define AS_STRING_DIRECTIVE ".asciz"
  60 #else
  61 /* GNU as */
  62 #define AS_STRING_DIRECTIVE ".string"
  63 #endif
  64
  65
  66 // __MACH__
  67 // .byte generates 1 byte per expression.
  68 // .short generates 2 bytes per expression.
  69 // .long generates 4 bytes per expression.
  70 // .quad generates 8 bytes per expression.
  71
  72 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
  73 #define ALIGN_PTR_TO(ptr,align) (gpointer)((((gssize)(ptr)) + (align - 1)) & (~(align - 1)))
  74 #define ROUND_DOWN(VALUE,SIZE)  ((VALUE) & ~((SIZE) - 1))
  75
  76 #if defined(__x86_64__) && !defined(PLATFORM_WIN32)
  77 #define USE_ELF_WRITER 1
  78 #define USE_ELF_RELA 1
  79 #endif
  80
  81 #if defined(__i386__) && !defined(PLATFORM_WIN32)
  82 #define USE_ELF_WRITER 1
  83 #endif
  84
  85 #if defined(__arm__) && !defined(__MACH__)
  86 #define USE_ELF_WRITER 1
  87 #endif
  88
  89 #if defined(__mips__)
  90 #define USE_ELF_WRITER 1
  91 #endif
  92
  93 #if defined(USE_ELF_WRITER)
  94 #define USE_BIN_WRITER 1
  95 #endif
  96
  97 #ifdef USE_BIN_WRITER
  98
  99 typedef struct _BinSymbol BinSymbol;
 100 typedef struct _BinReloc BinReloc;
 101 typedef struct _BinSection BinSection;
 102
 103 #endif
 104
 105 /* emit mode */
 106 enum {
 107         EMIT_NONE,
 108         EMIT_BYTE,
 109         EMIT_WORD,
 110         EMIT_LONG
 111 };
 112
 113 struct _MonoImageWriter {
 114         MonoMemPool *mempool;
 115         char *outfile;
 116         gboolean use_bin_writer;
 117         const char *current_section;
 118         int current_subsection;
 119         const char *section_stack [16];
 120         int subsection_stack [16];
 121         int stack_pos;
 122         FILE *fp;
 123         /* Bin writer */
 124 #ifdef USE_BIN_WRITER
 125         BinSymbol *symbols;
 126         BinSection *sections;
 127         BinSection *cur_section;
 128         BinReloc *relocations;
 129         GHashTable *labels;
 130         int num_relocs;
 131 #endif
 132         /* Asm writer */
 133         char *tmpfname;
 134         int mode; /* emit mode */
 135         int col_count; /* bytes emitted per .byte line */
 136 };
 137
 138 static G_GNUC_UNUSED int
 139 ilog2(register int value)
 140 {
 141         int count = -1;
 142         while (value & ~0xf) count += 4, value >>= 4;
 143         while (value) count++, value >>= 1;
 144         return count;
 145 }
 146
 147 #ifdef USE_BIN_WRITER
 148
 149 typedef struct _BinLabel BinLabel;
 150 struct _BinLabel {
 151         char *name;
 152         BinSection *section;
 153         int offset;
 154 };
 155
 156 struct _BinReloc {
 157         BinReloc *next;
 158         char *val1;
 159         char *val2;
 160         BinSection *val2_section;
 161         int val2_offset;
 162         int offset;
 163         BinSection *section;
 164         int section_offset;
 165         int reloc_type;
 166 };
 167
 168 struct _BinSymbol {
 169         BinSymbol *next;
 170         char *name;
 171         BinSection *section;
 172         int offset;
 173         gboolean is_function;
 174         gboolean is_global;
 175         char *end_label;
 176 };
 177
 178 struct _BinSection {
 179         BinSection *next;
 180         BinSection *parent;
 181         char *name;
 182         int subsection;
 183         guint8 *data;
 184         int data_len;
 185         int cur_offset;
 186         int file_offset;
 187         int virt_offset;
 188         int shidx;
 189 };
 190
 191 static void
 192 bin_writer_emit_start (MonoImageWriter *acfg)
 193 {
 194         acfg->labels = g_hash_table_new (g_str_hash, g_str_equal);
 195 }
 196
 197 static void
 198 bin_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
 199 {
 200         BinSection *section;
 201
 202         if (acfg->cur_section && acfg->cur_section->subsection == subsection_index
 203                         && strcmp (acfg->cur_section->name, section_name) == 0)
 204                 return;
 205         for (section = acfg->sections; section; section = section->next) {
 206                 if (section->subsection == subsection_index && strcmp (section->name, section_name) == 0) {
 207                         acfg->cur_section = section;
 208                         return;
 209                 }
 210         }
 211         if (!section) {
 212                 section = g_new0 (BinSection, 1);
 213                 section->name = g_strdup (section_name);
 214                 section->subsection = subsection_index;
 215                 section->next = acfg->sections;
 216                 acfg->sections = section;
 217                 acfg->cur_section = section;
 218         }
 219 }
 220
 221 static void
 222 bin_writer_emit_symbol_inner (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean is_global, gboolean func)
 223 {
 224         BinSymbol *symbol = g_new0 (BinSymbol, 1);
 225         symbol->name = g_strdup (name);
 226         if (end_label)
 227                 symbol->end_label = g_strdup (end_label);
 228         symbol->is_function = func;
 229         symbol->is_global = is_global;
 230         symbol->section = acfg->cur_section;
 231         /* FIXME: we align after this call... */
 232         symbol->offset = symbol->section->cur_offset;
 233         symbol->next = acfg->symbols;
 234         acfg->symbols = symbol;
 235 }
 236
 237 static void
 238 bin_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
 239 {
 240         bin_writer_emit_symbol_inner (acfg, name, NULL, TRUE, func);
 241 }
 242
 243 static void
 244 bin_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
 245 {
 246         bin_writer_emit_symbol_inner (acfg, name, end_label, FALSE, func);
 247 }
 248
 249 static void
 250 bin_writer_emit_label (MonoImageWriter *acfg, const char *name)
 251 {
 252         BinLabel *label = g_new0 (BinLabel, 1);
 253         label->name = g_strdup (name);
 254         label->section = acfg->cur_section;
 255         label->offset = acfg->cur_section->cur_offset;
 256         g_hash_table_insert (acfg->labels, label->name, label);
 257 }
 258
 259 static void
 260 bin_writer_emit_ensure_buffer (BinSection *section, int size)
 261 {
 262         int new_offset = section->cur_offset + size;
 263         if (new_offset >= section->data_len) {
 264                 int new_size = section->data_len? section->data_len * 2: 256;
 265                 guint8 *data;
 266                 while (new_size <= new_offset)
 267                         new_size *= 2;
 268                 data = g_malloc0 (new_size);
 269                 memcpy (data, section->data, section->data_len);
 270                 g_free (section->data);
 271                 section->data = data;
 272                 section->data_len = new_size;
 273         }
 274 }
 275
 276 static void
 277 bin_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
 278 {
 279         bin_writer_emit_ensure_buffer (acfg->cur_section, size);
 280         memcpy (acfg->cur_section->data + acfg->cur_section->cur_offset, buf, size);
 281         acfg->cur_section->cur_offset += size;
 282 }
 283
 284 static void
 285 bin_writer_emit_string (MonoImageWriter *acfg, const char *value)
 286 {
 287         int size = strlen (value) + 1;
 288         bin_writer_emit_bytes (acfg, (const guint8*)value, size);
 289 }
 290
 291 static void
 292 bin_writer_emit_line (MonoImageWriter *acfg)
 293 {
 294         /* Nothing to do in binary writer */
 295 }
 296
 297 static void
 298 bin_writer_emit_alignment (MonoImageWriter *acfg, int size)
 299 {
 300         int offset = acfg->cur_section->cur_offset;
 301         int add;
 302         offset += (size - 1);
 303         offset &= ~(size - 1);
 304         add = offset - acfg->cur_section->cur_offset;
 305         if (add) {
 306                 bin_writer_emit_ensure_buffer (acfg->cur_section, add);
 307                 acfg->cur_section->cur_offset += add;
 308         }
 309 }
 310
 311 static void
 312 bin_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
 313 {
 314         BinReloc *reloc;
 315
 316         if (!target)
 317                 // FIXME:
 318                 g_assert_not_reached ();
 319         reloc = g_new0 (BinReloc, 1);
 320         reloc->val1 = g_strdup (target);
 321         reloc->section = acfg->cur_section;
 322         reloc->section_offset = acfg->cur_section->cur_offset;
 323         reloc->next = acfg->relocations;
 324         acfg->relocations = reloc;
 325         if (strcmp (reloc->section->name, ".data") == 0) {
 326                 acfg->num_relocs++;
 327                 g_print ("reloc: %s at %d\n", target, acfg->cur_section->cur_offset);
 328         }
 329         acfg->cur_section->cur_offset += sizeof (gpointer);
 330 }
 331
 332 static void
 333 bin_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
 334 {
 335         bin_writer_emit_alignment (acfg, sizeof (gpointer));
 336         bin_writer_emit_pointer_unaligned (acfg, target);
 337 }
 338
 339 static void
 340 bin_writer_emit_int16 (MonoImageWriter *acfg, int value)
 341 {
 342         guint8 *data;
 343         bin_writer_emit_ensure_buffer (acfg->cur_section, 2);
 344         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 345         acfg->cur_section->cur_offset += 2;
 346         /* FIXME: little endian */
 347         data [0] = value;
 348         data [1] = value >> 8;
 349 }
 350
 351 static void
 352 bin_writer_emit_int32 (MonoImageWriter *acfg, int value)
 353 {
 354         guint8 *data;
 355         bin_writer_emit_ensure_buffer (acfg->cur_section, 4);
 356         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 357         acfg->cur_section->cur_offset += 4;
 358         /* FIXME: little endian */
 359         data [0] = value;
 360         data [1] = value >> 8;
 361         data [2] = value >> 16;
 362         data [3] = value >> 24;
 363 }
 364
 365 static BinReloc*
 366 create_reloc (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 367 {
 368         BinReloc *reloc;
 369         reloc = mono_mempool_alloc0 (acfg->mempool, sizeof (BinReloc));
 370         reloc->val1 = mono_mempool_strdup (acfg->mempool, end);
 371         if (strcmp (start, ".") == 0) {
 372                 reloc->val2_section = acfg->cur_section;
 373                 reloc->val2_offset = acfg->cur_section->cur_offset;
 374         } else {
 375                 reloc->val2 = mono_mempool_strdup (acfg->mempool, start);
 376         }
 377         reloc->offset = offset;
 378         reloc->section = acfg->cur_section;
 379         reloc->section_offset = acfg->cur_section->cur_offset;
 380         reloc->next = acfg->relocations;
 381         acfg->relocations = reloc;
 382         return reloc;
 383 }
 384
 385 static void
 386 bin_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 387 {
 388         create_reloc (acfg, end, start, offset);
 389         acfg->cur_section->cur_offset += 4;
 390         /*if (strcmp (reloc->section->name, ".data") == 0) {
 391                 acfg->num_relocs++;
 392                 g_print ("reloc: %s - %s + %d at %d\n", end, start, offset, acfg->cur_section->cur_offset - 4);
 393         }*/
 394 }
 395
 396 /*
 397  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
 398  * Do not advance PC.
 399  */
 400 static G_GNUC_UNUSED void
 401 bin_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
 402 {
 403         BinReloc *reloc = create_reloc (acfg, symbol, ".", addend);
 404         reloc->reloc_type = reloc_type;
 405 }
 406
 407 static void
 408 bin_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
 409 {
 410         bin_writer_emit_ensure_buffer (acfg->cur_section, num);
 411         acfg->cur_section->cur_offset += num;
 412 }
 413
 414 #ifdef USE_ELF_WRITER
 415
 416 enum {
 417         SECT_NULL,
 418         SECT_HASH,
 419         SECT_DYNSYM,
 420         SECT_DYNSTR,
 421         SECT_REL_DYN,
 422         SECT_RELA_DYN,
 423         SECT_TEXT,
 424         SECT_DYNAMIC,
 425         SECT_GOT_PLT,
 426         SECT_DATA,
 427         SECT_BSS,
 428         SECT_DEBUG_FRAME,
 429         SECT_DEBUG_INFO,
 430         SECT_DEBUG_ABBREV,
 431         SECT_DEBUG_LINE,
 432         SECT_DEBUG_LOC,
 433         SECT_SHSTRTAB,
 434         SECT_SYMTAB,
 435         SECT_STRTAB,
 436         SECT_NUM
 437 };
 438
 439 #if SIZEOF_VOID_P == 4
 440
 441 typedef Elf32_Ehdr ElfHeader;
 442 typedef Elf32_Shdr ElfSectHeader;
 443 typedef Elf32_Phdr ElfProgHeader;
 444 typedef Elf32_Sym ElfSymbol;
 445 typedef Elf32_Rel ElfReloc;
 446 typedef Elf32_Rela ElfRelocA;
 447 typedef Elf32_Dyn ElfDynamic;
 448
 449 #else
 450
 451 typedef Elf64_Ehdr ElfHeader;
 452 typedef Elf64_Shdr ElfSectHeader;
 453 typedef Elf64_Phdr ElfProgHeader;
 454 typedef Elf64_Sym ElfSymbol;
 455 typedef Elf64_Rel ElfReloc;
 456 typedef Elf64_Rela ElfRelocA;
 457 typedef Elf64_Dyn ElfDynamic;
 458
 459 #endif
 460
 461 typedef struct {
 462         const char *name;
 463         int type;
 464         int esize;
 465         int flags;
 466         int align;
 467 } SectInfo;
 468
 469 static SectInfo section_info [] = {
 470         {"", 0, 0, 0, 0},
 471         {".hash", SHT_HASH, 4, 2, SIZEOF_VOID_P},
 472         {".dynsym", SHT_DYNSYM, sizeof (ElfSymbol), 2, SIZEOF_VOID_P},
 473         {".dynstr", SHT_STRTAB, 0, 2, 1},
 474         {".rel.dyn", SHT_REL, sizeof (ElfReloc), 2, SIZEOF_VOID_P},
 475         {".rela.dyn", SHT_RELA, sizeof (ElfRelocA), 2, SIZEOF_VOID_P},
 476         {".text", SHT_PROGBITS, 0, 6, 4096},
 477         {".dynamic", SHT_DYNAMIC, sizeof (ElfDynamic), 3, SIZEOF_VOID_P},
 478         {".got.plt", SHT_PROGBITS, SIZEOF_VOID_P, 3, SIZEOF_VOID_P},
 479         {".data", SHT_PROGBITS, 0, 3, 8},
 480         {".bss", SHT_NOBITS, 0, 3, 8},
 481         {".debug_frame", SHT_PROGBITS, 0, 0, 8},
 482         {".debug_info", SHT_PROGBITS, 0, 0, 1},
 483         {".debug_abbrev", SHT_PROGBITS, 0, 0, 1},
 484         {".debug_line", SHT_PROGBITS, 0, 0, 1},
 485         {".debug_loc", SHT_PROGBITS, 0, 0, 1},
 486         {".shstrtab", SHT_STRTAB, 0, 0, 1},
 487         {".symtab", SHT_SYMTAB, sizeof (ElfSymbol), 0, SIZEOF_VOID_P},
 488         {".strtab", SHT_STRTAB, 0, 0, 1}
 489 };
 490
 491 typedef struct {
 492         GString *data;
 493         GHashTable *hash;
 494 } ElfStrTable;
 495
 496 static int
 497 str_table_add (ElfStrTable *table, const char* value)
 498 {
 499         int idx;
 500         if (!table->data) {
 501                 table->data = g_string_new_len ("", 1);
 502                 table->hash = g_hash_table_new (g_str_hash, g_str_equal);
 503         }
 504         idx = GPOINTER_TO_UINT (g_hash_table_lookup (table->hash, value));
 505         if (idx)
 506                 return idx;
 507         idx = table->data->len;
 508         g_string_append (table->data, value);
 509         g_string_append_c (table->data, 0);
 510         g_hash_table_insert (table->hash, (void*)value, GUINT_TO_POINTER (idx));
 511         return idx;
 512 }
 513
 514 static void
 515 append_subsection (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection *sect, BinSection *add)
 516 {
 517         int offset = sect->cur_offset;
 518         /*offset += (sheaders [sect->shidx].sh_addralign - 1);
 519         offset &= ~(sheaders [sect->shidx].sh_addralign - 1);*/
 520         offset += (8 - 1);
 521         offset &= ~(8 - 1);
 522         bin_writer_emit_ensure_buffer (sect, offset);
 523         g_print ("section %s aligned to %d from %d\n", sect->name, offset, sect->cur_offset);
 524         sect->cur_offset = offset;
 525
 526         bin_writer_emit_ensure_buffer (sect, add->cur_offset);
 527         memcpy (sect->data + sect->cur_offset, add->data, add->cur_offset);
 528         add->parent = sect;
 529         sect->cur_offset += add->cur_offset;
 530         add->cur_offset = offset; /* it becomes the offset in the parent section */
 531         g_print ("subsection %d of %s added at offset %d (align: %d)\n", add->subsection, sect->name, add->cur_offset, (int)sheaders [sect->shidx].sh_addralign);
 532         add->data = NULL;
 533         add->data_len = 0;
 534 }
 535
 536 /* merge the subsections */
 537 static int
 538 collect_sections (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection **out, int num)
 539 {
 540         int i, j, maxs, num_sections;
 541         BinSection *sect;
 542
 543         num_sections = 0;
 544         maxs = 0;
 545         for (sect = acfg->sections; sect; sect = sect->next) {
 546                 if (sect->subsection == 0) {
 547                         out [num_sections++] = sect;
 548                         g_assert (num_sections < num);
 549                 }
 550                 maxs = MAX (maxs, sect->subsection);
 551         }
 552         for (i = 0; i < num_sections; i++) {
 553                 for (j = 1; j <= maxs; ++j) {
 554                         for (sect = acfg->sections; sect; sect = sect->next) {
 555                                 if (sect->subsection == j && strcmp (out [i]->name, sect->name) == 0) {
 556                                         append_subsection (acfg, sheaders, out [i], sect);
 557                                 }
 558                         }
 559                 }
 560         }
 561         return num_sections;
 562 }
 563
 564 static unsigned long
 565 elf_hash (const unsigned char *name)
 566 {
 567         unsigned long h = 0, g;
 568         while (*name) {
 569                 h = (h << 4) + *name++;
 570                 if ((g = h & 0xf0000000))
 571                         h ^= g >> 24;
 572                 h &= ~g;
 573         }
 574         return h;
 575 }
 576
 577 #define NUM_BUCKETS 17
 578
 579 static int*
 580 build_hash (MonoImageWriter *acfg, int num_sections, ElfStrTable *dynstr)
 581 {
 582         int *data;
 583         int num_symbols = 1 + num_sections + 3;
 584         BinSymbol *symbol;
 585
 586         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 587                 if (!symbol->is_global)
 588                         continue;
 589                 num_symbols++;
 590                 str_table_add (dynstr, symbol->name);
 591                 /*g_print ("adding sym: %s\n", symbol->name);*/
 592         }
 593         str_table_add (dynstr, "__bss_start");
 594         str_table_add (dynstr, "_edata");
 595         str_table_add (dynstr, "_end");
 596
 597         data = g_new0 (int, num_symbols + 2 + NUM_BUCKETS);
 598         data [0] = NUM_BUCKETS;
 599         data [1] = num_symbols;
 600
 601         return data;
 602 }
 603
 604 static gsize
 605 get_label_addr (MonoImageWriter *acfg, const char *name)
 606 {
 607         int offset;
 608         BinLabel *lab;
 609         BinSection *section;
 610         gsize value;
 611
 612         lab = g_hash_table_lookup (acfg->labels, name);
 613         if (!lab)
 614                 g_error ("Undefined label: '%s'.\n", name);
 615         section = lab->section;
 616         offset = lab->offset;
 617         if (section->parent) {
 618                 value = section->parent->virt_offset + section->cur_offset + offset;
 619         } else {
 620                 value = section->virt_offset + offset;
 621         }
 622         return value;
 623 }
 624
 625 static ElfSymbol*
 626 collect_syms (MonoImageWriter *acfg, int *hash, ElfStrTable *strtab, ElfSectHeader *sheaders, int *num_syms)
 627 {
 628         ElfSymbol *symbols;
 629         BinSymbol *symbol;
 630         BinSection *section;
 631         int i;
 632         int *bucket;
 633         int *chain;
 634         unsigned long hashc;
 635
 636         if (hash)
 637                 symbols = g_new0 (ElfSymbol, hash [1]);
 638         else {
 639                 i = 0;
 640                 for (symbol = acfg->symbols; symbol; symbol = symbol->next)
 641                         i ++;
 642
 643                 symbols = g_new0 (ElfSymbol, i + SECT_NUM + 10); /* FIXME */
 644         }
 645
 646         /* the first symbol is undef, all zeroes */
 647         i = 1;
 648         if (sheaders) {
 649                 int j;
 650                 for (j = 1; j < SECT_NUM; ++j) {
 651                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 652                         symbols [i].st_shndx = j;
 653                         symbols [i].st_value = sheaders [j].sh_addr;
 654                         ++i;
 655                 }
 656         } else {
 657                 for (section = acfg->sections; section; section = section->next) {
 658                         if (section->parent)
 659                                 continue;
 660                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 661                         if (strcmp (section->name, ".text") == 0) {
 662                                 symbols [i].st_shndx = SECT_TEXT;
 663                                 section->shidx = SECT_TEXT;
 664                                 section->file_offset = 4096;
 665                                 symbols [i].st_value = section->virt_offset;
 666                         } else if (strcmp (section->name, ".data") == 0) {
 667                                 symbols [i].st_shndx = SECT_DATA;
 668                                 section->shidx = SECT_DATA;
 669                                 section->file_offset = 4096 + 28; /* FIXME */
 670                                 symbols [i].st_value = section->virt_offset;
 671                         } else if (strcmp (section->name, ".bss") == 0) {
 672                                 symbols [i].st_shndx = SECT_BSS;
 673                                 section->shidx = SECT_BSS;
 674                                 section->file_offset = 4096 + 28 + 8; /* FIXME */
 675                                 symbols [i].st_value = section->virt_offset;
 676                         }
 677                         ++i;
 678                 }
 679         }
 680         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 681                 int offset;
 682                 BinLabel *lab;
 683                 if (!symbol->is_global && hash)
 684                         continue;
 685                 symbols [i].st_info = ELF32_ST_INFO (symbol->is_global ? STB_GLOBAL : STB_LOCAL, symbol->is_function? STT_FUNC : STT_OBJECT);
 686                 symbols [i].st_name = str_table_add (strtab, symbol->name);
 687                 /*g_print ("sym name %s tabled to %d\n", symbol->name, symbols [i].st_name);*/
 688                 section = symbol->section;
 689                 symbols [i].st_shndx = section->parent? section->parent->shidx: section->shidx;
 690                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 691                 offset = lab->offset;
 692                 if (section->parent) {
 693                         symbols [i].st_value = section->parent->virt_offset + section->cur_offset + offset;
 694                 } else {
 695                         symbols [i].st_value = section->virt_offset + offset;
 696                 }
 697
 698                 if (symbol->end_label) {
 699                         BinLabel *elab = g_hash_table_lookup (acfg->labels, symbol->end_label);
 700                         g_assert (elab);
 701                         symbols [i].st_size = elab->offset - lab->offset;
 702                 }
 703                 ++i;
 704         }
 705         /* add special symbols */
 706         symbols [i].st_name = str_table_add (strtab, "__bss_start");
 707         symbols [i].st_shndx = 0xfff1;
 708         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 709         ++i;
 710         symbols [i].st_name = str_table_add (strtab, "_edata");
 711         symbols [i].st_shndx = 0xfff1;
 712         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 713         ++i;
 714         symbols [i].st_name = str_table_add (strtab, "_end");
 715         symbols [i].st_shndx = 0xfff1;
 716         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 717         ++i;
 718
 719         if (num_syms)
 720                 *num_syms = i;
 721
 722         /* add to hash table */
 723         if (hash) {
 724                 bucket = hash + 2;
 725                 chain = hash + 2 + hash [0];
 726                 for (i = 0; i < hash [1]; ++i) {
 727                         int slot;
 728                         /*g_print ("checking %d '%s' (sym %d)\n", symbols [i].st_name, strtab->data->str + symbols [i].st_name, i);*/
 729                         if (!symbols [i].st_name)
 730                                 continue;
 731                         hashc = elf_hash ((guint8*)strtab->data->str + symbols [i].st_name);
 732                         slot = hashc % hash [0];
 733                         /*g_print ("hashing '%s' at slot %d (sym %d)\n", strtab->data->str + symbols [i].st_name, slot, i);*/
 734                         if (bucket [slot]) {
 735                                 chain [i] = bucket [slot];
 736                                 bucket [slot] = i;
 737                         } else {
 738                                 bucket [slot] = i;
 739                         }
 740                 }
 741         }
 742         return symbols;
 743 }
 744
 745 static void
 746 reloc_symbols (MonoImageWriter *acfg, ElfSymbol *symbols, ElfSectHeader *sheaders, ElfStrTable *strtab, gboolean dynamic)
 747 {
 748         BinSection *section;
 749         BinSymbol *symbol;
 750         int i;
 751
 752         i = 1;
 753         if (dynamic) {
 754                 for (section = acfg->sections; section; section = section->next) {
 755                         if (section->parent)
 756                                 continue;
 757                         symbols [i].st_value = sheaders [section->shidx].sh_addr;
 758                         ++i;
 759                 }
 760         } else {
 761                 for (i = 1; i < SECT_NUM; ++i) {
 762                         symbols [i].st_value = sheaders [i].sh_addr;
 763                 }
 764         }
 765         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 766                 int offset;
 767                 BinLabel *lab;
 768                 if (dynamic && !symbol->is_global)
 769                         continue;
 770                 section = symbol->section;
 771                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 772                 offset = lab->offset;
 773                 if (section->parent) {
 774                         symbols [i].st_value = sheaders [section->parent->shidx].sh_addr + section->cur_offset + offset;
 775                 } else {
 776                         symbols [i].st_value = sheaders [section->shidx].sh_addr + offset;
 777                 }
 778                 ++i;
 779         }
 780         /* __bss_start */
 781         symbols [i].st_value = sheaders [SECT_BSS].sh_addr;
 782         ++i;
 783         /* _edata */
 784         symbols [i].st_value = sheaders [SECT_DATA].sh_addr + sheaders [SECT_DATA].sh_size;
 785         ++i;
 786         /* _end */
 787         symbols [i].st_value = sheaders [SECT_BSS].sh_addr + sheaders [SECT_BSS].sh_size;
 788         ++i;
 789 }
 790
 791 static void
 792 resolve_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 **out_data, gsize *out_vaddr, gsize *out_start_val, gsize *out_end_val)
 793 {
 794         guint8 *data;
 795         gssize end_val, start_val;
 796         gsize vaddr;
 797
 798         end_val = get_label_addr (acfg, reloc->val1);
 799         if (reloc->val2) {
 800                 start_val = get_label_addr (acfg, reloc->val2);
 801         } else if (reloc->val2_section) {
 802                 start_val = reloc->val2_offset;
 803                 if (reloc->val2_section->parent)
 804                         start_val += reloc->val2_section->parent->virt_offset + reloc->val2_section->cur_offset;
 805                 else
 806                         start_val += reloc->val2_section->virt_offset;
 807         } else {
 808                 start_val = 0;
 809         }
 810         end_val = end_val - start_val + reloc->offset;
 811         if (reloc->section->parent) {
 812                 data = reloc->section->parent->data;
 813                 data += reloc->section->cur_offset;
 814                 data += reloc->section_offset;
 815                 vaddr = reloc->section->parent->virt_offset;
 816                 vaddr += reloc->section->cur_offset;
 817                 vaddr += reloc->section_offset;
 818         } else {
 819                 data = reloc->section->data;
 820                 data += reloc->section_offset;
 821                 vaddr = reloc->section->virt_offset;
 822                 vaddr += reloc->section_offset;
 823         }
 824
 825         *out_start_val = start_val;
 826         *out_end_val = end_val;
 827         *out_data = data;
 828         *out_vaddr = vaddr;
 829 }
 830
 831 #ifdef USE_ELF_RELA
 832
 833 static ElfRelocA*
 834 resolve_relocations (MonoImageWriter *acfg)
 835 {
 836         BinReloc *reloc;
 837         guint8 *data;
 838         gsize end_val, start_val;
 839         ElfRelocA *rr;
 840         int i;
 841         gsize vaddr;
 842
 843         rr = g_new0 (ElfRelocA, acfg->num_relocs);
 844         i = 0;
 845
 846         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 847                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 848                 /* FIXME: little endian */
 849                 data [0] = end_val;
 850                 data [1] = end_val >> 8;
 851                 data [2] = end_val >> 16;
 852                 data [3] = end_val >> 24;
 853                 // FIXME:
 854                 if (start_val == 0 && reloc->val1 [0] != '.') {
 855                         rr [i].r_offset = vaddr;
 856                         rr [i].r_info = R_X86_64_RELATIVE;
 857                         rr [i].r_addend = end_val;
 858                         ++i;
 859                         g_assert (i <= acfg->num_relocs);
 860                 }
 861         }
 862         return rr;
 863 }
 864
 865 #else /* USE_ELF_RELA */
 866
 867 static void
 868 do_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 *data, gssize addr)
 869 {
 870 #ifdef __arm__
 871         /*
 872          * We use the official ARM relocation types, but implement only the stuff actually
 873          * needed by the code we generate.
 874          */
 875         switch (reloc->reloc_type) {
 876         case R_ARM_CALL: {
 877                 guint32 *code = (guint32*)(gpointer)data;
 878                 guint32 ins = *code;
 879                 int diff = addr;
 880
 881                 /* bl */
 882                 g_assert (data [3] == 0xeb);
 883                 if (diff >= 0 && diff <= 33554431) {
 884                         diff >>= 2;
 885                         ins = (ins & 0xff000000) | diff;
 886                         *code = ins;
 887                 } else if (diff <= 0 && diff >= -33554432) {
 888                         diff >>= 2;
 889                         ins = (ins & 0xff000000) | (diff & ~0xff000000);
 890                         *code = ins;
 891                 } else {
 892                         g_assert_not_reached ();
 893                 }
 894                 break;
 895         }
 896         case R_ARM_ALU_PC_G0_NC: {
 897                 /* Generated by emit_plt () */
 898                 guint8 *code = data;
 899                 guint32 val = addr;
 900
 901                 g_assert (val <= 0xffff);
 902                 ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, 0, 0);
 903                 ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_IP, (val & 0xFF00) >> 8, 24);
 904                 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, val & 0xFF);
 905                 break;
 906         }
 907         default:
 908                 g_assert_not_reached ();
 909         }
 910 #else
 911         g_assert_not_reached ();
 912 #endif
 913 }
 914
 915 static ElfReloc*
 916 resolve_relocations (MonoImageWriter *acfg)
 917 {
 918         BinReloc *reloc;
 919         guint8 *data;
 920         gsize end_val, start_val;
 921         ElfReloc *rr;
 922         int i;
 923         gsize vaddr;
 924
 925         rr = g_new0 (ElfReloc, acfg->num_relocs);
 926         i = 0;
 927
 928         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 929                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 930                 /* FIXME: little endian */
 931                 if (reloc->reloc_type) {
 932                         /* Must be static */
 933                         g_assert (start_val > 0);
 934                         do_reloc (acfg, reloc, data, end_val);
 935                 } else {
 936                         data [0] = end_val;
 937                         data [1] = end_val >> 8;
 938                         data [2] = end_val >> 16;
 939                         data [3] = end_val >> 24;
 940                 }
 941                 // FIXME:
 942                 if (start_val == 0 && reloc->val1 [0] != '.') {
 943                         rr [i].r_offset = vaddr;
 944                         rr [i].r_info = R_386_RELATIVE;
 945                         ++i;
 946                         g_assert (i <= acfg->num_relocs);
 947                 }
 948         }
 949         return rr;
 950 }
 951
 952 #endif /* USE_ELF_RELA */
 953
 954 static int
 955 bin_writer_emit_writeout (MonoImageWriter *acfg)
 956 {
 957         FILE *file;
 958         ElfHeader header;
 959         ElfProgHeader progh [3];
 960         ElfSectHeader secth [SECT_NUM];
 961 #ifdef USE_ELF_RELA
 962         ElfRelocA *relocs;
 963 #else
 964         ElfReloc *relocs;
 965 #endif
 966         ElfStrTable str_table = {NULL, NULL};
 967         ElfStrTable sh_str_table = {NULL, NULL};
 968         ElfStrTable dyn_str_table = {NULL, NULL};
 969         BinSection* all_sections [32];
 970         BinSection* sections [SECT_NUM];
 971         ElfSymbol *dynsym;
 972         ElfSymbol *symtab;
 973         ElfDynamic dynamic [14];
 974         int *hash;
 975         int i, num_sections, file_offset, virt_offset, size, num_symtab;
 976         int num_local_syms;
 977
 978         file = acfg->fp;
 979
 980         /* Section headers */
 981         memset (&secth, 0, sizeof (secth));
 982         memset (&dynamic, 0, sizeof (dynamic));
 983         memset (&header, 0, sizeof (header));
 984
 985         for (i = 1; i < SECT_NUM; ++i) {
 986                 secth [i].sh_name = str_table_add (&sh_str_table, section_info [i].name);
 987                 secth [i].sh_type = section_info [i].type;
 988                 secth [i].sh_addralign = section_info [i].align;
 989                 secth [i].sh_flags = section_info [i].flags;
 990                 secth [i].sh_entsize = section_info [i].esize;
 991         }
 992         secth [SECT_DYNSYM].sh_info = SIZEOF_VOID_P == 4 ? 4 : 2;
 993         secth [SECT_SYMTAB].sh_info = SIZEOF_VOID_P == 4 ? 20 : 17;
 994         secth [SECT_HASH].sh_link = SECT_DYNSYM;
 995         secth [SECT_DYNSYM].sh_link = SECT_DYNSTR;
 996         secth [SECT_REL_DYN].sh_link = SECT_DYNSYM;
 997         secth [SECT_RELA_DYN].sh_link = SECT_DYNSYM;
 998         secth [SECT_DYNAMIC].sh_link = SECT_DYNSTR;
 999         secth [SECT_SYMTAB].sh_link = SECT_STRTAB;
1000
1001         num_sections = collect_sections (acfg, secth, all_sections, 16);
1002         hash = build_hash (acfg, num_sections, &dyn_str_table);
1003         num_symtab = hash [1]; /* FIXME */
1004         g_print ("num_sections: %d\n", num_sections);
1005         g_print ("dynsym: %d, dynstr size: %d\n", hash [1], (int)dyn_str_table.data->len);
1006         for (i = 0; i < num_sections; ++i) {
1007                 g_print ("section %s, size: %d, %x\n", all_sections [i]->name, all_sections [i]->cur_offset, all_sections [i]->cur_offset);
1008         }
1009
1010         /* Associate the bin sections with the ELF sections */
1011         memset (sections, 0, sizeof (sections));
1012         for (i = 0; i < num_sections; ++i) {
1013                 BinSection *sect = all_sections [i];
1014                 int j;
1015
1016                 for (j = 0; j < SECT_NUM; ++j) {
1017                         if (strcmp (sect->name, section_info [j].name) == 0) {
1018                                 sect->shidx = j;
1019                                 break;
1020                         }
1021                 }
1022
1023                 sections [all_sections [i]->shidx] = sect;
1024         }
1025
1026         /* at this point we know where in the file the first segment sections go */
1027         dynsym = collect_syms (acfg, hash, &dyn_str_table, NULL, NULL);
1028         num_local_syms = hash [1];
1029         symtab = collect_syms (acfg, NULL, &str_table, secth, &num_local_syms);
1030
1031         file_offset = virt_offset = sizeof (header) + sizeof (progh);
1032         secth [SECT_HASH].sh_addr = secth [SECT_HASH].sh_offset = file_offset;
1033         size = sizeof (int) * (2 + hash [0] + hash [1]);
1034         virt_offset = (file_offset += size);
1035         secth [SECT_HASH].sh_size = size;
1036         secth [SECT_DYNSYM].sh_addr = secth [SECT_DYNSYM].sh_offset = file_offset;
1037         size = sizeof (ElfSymbol) * hash [1];
1038         virt_offset = (file_offset += size);
1039         secth [SECT_DYNSYM].sh_size = size;
1040         secth [SECT_DYNSTR].sh_addr = secth [SECT_DYNSTR].sh_offset = file_offset;
1041         size = dyn_str_table.data->len;
1042         virt_offset = (file_offset += size);
1043         secth [SECT_DYNSTR].sh_size = size;
1044         file_offset += 4-1;
1045         file_offset &= ~(4-1);
1046         secth [SECT_REL_DYN].sh_addr = secth [SECT_REL_DYN].sh_offset = file_offset;
1047 #ifndef USE_ELF_RELA
1048         size = sizeof (ElfReloc) * acfg->num_relocs;
1049 #else
1050         size = 0;
1051 #endif
1052         virt_offset = (file_offset += size);
1053         secth [SECT_REL_DYN].sh_size = size;
1054         secth [SECT_RELA_DYN].sh_addr = secth [SECT_RELA_DYN].sh_offset = file_offset;
1055 #ifdef USE_ELF_RELA
1056         size = sizeof (ElfRelocA) * acfg->num_relocs;
1057 #else
1058         size = 0;
1059 #endif
1060         virt_offset = (file_offset += size);
1061         secth [SECT_RELA_DYN].sh_size = size;
1062
1063         file_offset = ALIGN_TO (file_offset, secth [SECT_TEXT].sh_addralign);
1064         virt_offset = file_offset;
1065         secth [SECT_TEXT].sh_addr = secth [SECT_TEXT].sh_offset = file_offset;
1066         if (sections [SECT_TEXT]) {
1067                 size = sections [SECT_TEXT]->cur_offset;
1068                 secth [SECT_TEXT].sh_size = size;
1069                 file_offset += size;
1070         }
1071
1072         file_offset = ALIGN_TO (file_offset, secth [SECT_DYNAMIC].sh_addralign);
1073         virt_offset = file_offset;
1074
1075         /* .dynamic, .got.plt, .data, .bss here */
1076         /* Have to increase the virt offset since these go to a separate segment */
1077         virt_offset += PAGESIZE;
1078         secth [SECT_DYNAMIC].sh_addr = virt_offset;
1079         secth [SECT_DYNAMIC].sh_offset = file_offset;
1080         size = sizeof (dynamic);
1081         secth [SECT_DYNAMIC].sh_size = size;
1082         file_offset += size;
1083         virt_offset += size;
1084
1085         file_offset = ALIGN_TO (file_offset, secth [SECT_GOT_PLT].sh_addralign);
1086         virt_offset = ALIGN_TO (virt_offset, secth [SECT_GOT_PLT].sh_addralign);
1087         secth [SECT_GOT_PLT].sh_addr = virt_offset;
1088         secth [SECT_GOT_PLT].sh_offset = file_offset;
1089         size = 12;
1090         secth [SECT_GOT_PLT].sh_size = size;
1091         file_offset += size;
1092         virt_offset += size;
1093
1094         file_offset = ALIGN_TO (file_offset, secth [SECT_DATA].sh_addralign);
1095         virt_offset = ALIGN_TO (virt_offset, secth [SECT_DATA].sh_addralign);
1096         secth [SECT_DATA].sh_addr = virt_offset;
1097         secth [SECT_DATA].sh_offset = file_offset;
1098         if (sections [SECT_DATA]) {
1099                 size = sections [SECT_DATA]->cur_offset;
1100                 secth [SECT_DATA].sh_size = size;
1101                 file_offset += size;
1102                 virt_offset += size;
1103         }
1104
1105         file_offset = ALIGN_TO (file_offset, secth [SECT_BSS].sh_addralign);
1106         virt_offset = ALIGN_TO (virt_offset, secth [SECT_BSS].sh_addralign);
1107         secth [SECT_BSS].sh_addr = virt_offset;
1108         secth [SECT_BSS].sh_offset = file_offset;
1109         if (sections [SECT_BSS]) {
1110                 size = sections [SECT_BSS]->cur_offset;
1111                 secth [SECT_BSS].sh_size = size;
1112         }
1113
1114         /* virtual doesn't matter anymore */
1115         file_offset = ALIGN_TO (file_offset, secth [SECT_DEBUG_FRAME].sh_addralign);
1116         secth [SECT_DEBUG_FRAME].sh_offset = file_offset;
1117         if (sections [SECT_DEBUG_FRAME])
1118                 size = sections [SECT_DEBUG_FRAME]->cur_offset;
1119         else
1120                 size = 0;
1121         secth [SECT_DEBUG_FRAME].sh_size = size;
1122         file_offset += size;
1123
1124         secth [SECT_DEBUG_INFO].sh_offset = file_offset;
1125         if (sections [SECT_DEBUG_INFO])
1126                 size = sections [SECT_DEBUG_INFO]->cur_offset;
1127         else
1128                 size = 0;
1129         secth [SECT_DEBUG_INFO].sh_size = size;
1130         file_offset += size;
1131
1132         secth [SECT_DEBUG_ABBREV].sh_offset = file_offset;
1133         if (sections [SECT_DEBUG_ABBREV])
1134                 size = sections [SECT_DEBUG_ABBREV]->cur_offset;
1135         else
1136                 size = 0;
1137         secth [SECT_DEBUG_ABBREV].sh_size = size;
1138         file_offset += size;
1139
1140         secth [SECT_DEBUG_LINE].sh_offset = file_offset;
1141         if (sections [SECT_DEBUG_LINE])
1142                 size = sections [SECT_DEBUG_LINE]->cur_offset;
1143         else
1144                 size = 0;
1145         secth [SECT_DEBUG_LINE].sh_size = size;
1146         file_offset += size;
1147
1148         secth [SECT_DEBUG_LOC].sh_offset = file_offset;
1149         if (sections [SECT_DEBUG_LOC])
1150                 size = sections [SECT_DEBUG_LOC]->cur_offset;
1151         else
1152                 size = 0;
1153         secth [SECT_DEBUG_LOC].sh_size = size;
1154         file_offset += size;
1155
1156         file_offset = ALIGN_TO (file_offset, secth [SECT_SHSTRTAB].sh_addralign);
1157         secth [SECT_SHSTRTAB].sh_offset = file_offset;
1158         size = sh_str_table.data->len;
1159         secth [SECT_SHSTRTAB].sh_size = size;
1160         file_offset += size;
1161
1162         file_offset = ALIGN_TO (file_offset, secth [SECT_SYMTAB].sh_addralign);
1163         secth [SECT_SYMTAB].sh_offset = file_offset;
1164         size = sizeof (ElfSymbol) * num_local_syms;
1165         secth [SECT_SYMTAB].sh_size = size;
1166         file_offset += size;
1167
1168         file_offset = ALIGN_TO (file_offset, secth [SECT_STRTAB].sh_addralign);
1169         secth [SECT_STRTAB].sh_offset = file_offset;
1170         size = str_table.data->len;
1171         secth [SECT_STRTAB].sh_size = size;
1172         file_offset += size;
1173
1174         file_offset += 4-1;
1175         file_offset &= ~(4-1);
1176
1177         header.e_ident [EI_MAG0] = ELFMAG0;
1178         header.e_ident [EI_MAG1] = ELFMAG1;
1179         header.e_ident [EI_MAG2] = ELFMAG2;
1180         header.e_ident [EI_MAG3] = ELFMAG3;
1181         header.e_ident [EI_CLASS] = SIZEOF_VOID_P == 4 ? ELFCLASS32 : ELFCLASS64;
1182         header.e_ident [EI_DATA] = ELFDATA2LSB;
1183         header.e_ident [EI_VERSION] = EV_CURRENT;
1184         header.e_ident [EI_OSABI] = ELFOSABI_NONE;
1185         header.e_ident [EI_ABIVERSION] = 0;
1186         for (i = EI_PAD; i < EI_NIDENT; ++i)
1187                 header.e_ident [i] = 0;
1188
1189         header.e_type = ET_DYN;
1190 #if defined(__i386__)
1191         header.e_machine = EM_386;
1192 #elif defined(__x86_64__)
1193         header.e_machine = EM_X86_64;
1194 #elif defined(__arm__)
1195         header.e_machine = EM_ARM;
1196 #else
1197         g_assert_not_reached ();
1198 #endif
1199         header.e_version = 1;
1200
1201         header.e_phoff = sizeof (header);
1202         header.e_ehsize = sizeof (header);
1203         header.e_phentsize = sizeof (ElfProgHeader);
1204         header.e_phnum = 3;
1205         header.e_entry = secth [SECT_TEXT].sh_addr;
1206         header.e_shstrndx = SECT_SHSTRTAB;
1207         header.e_shentsize = sizeof (ElfSectHeader);
1208         header.e_shnum = SECT_NUM;
1209         header.e_shoff = file_offset;
1210
1211         /* dynamic data */
1212         i = 0;
1213         dynamic [i].d_tag = DT_HASH;
1214         dynamic [i].d_un.d_val = secth [SECT_HASH].sh_offset;
1215         ++i;
1216         dynamic [i].d_tag = DT_STRTAB;
1217         dynamic [i].d_un.d_val = secth [SECT_DYNSTR].sh_offset;
1218         ++i;
1219         dynamic [i].d_tag = DT_SYMTAB;
1220         dynamic [i].d_un.d_val = secth [SECT_DYNSYM].sh_offset;
1221         ++i;
1222         dynamic [i].d_tag = DT_STRSZ;
1223         dynamic [i].d_un.d_val = dyn_str_table.data->len;
1224         ++i;
1225         dynamic [i].d_tag = DT_SYMENT;
1226         dynamic [i].d_un.d_val = sizeof (ElfSymbol);
1227         ++i;
1228 #ifdef USE_ELF_RELA
1229         dynamic [i].d_tag = DT_RELA;
1230         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_offset;
1231         ++i;
1232         dynamic [i].d_tag = DT_RELASZ;
1233         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_size;
1234         ++i;
1235         dynamic [i].d_tag = DT_RELAENT;
1236         dynamic [i].d_un.d_val = sizeof (ElfRelocA);
1237         ++i;
1238 #else
1239         dynamic [i].d_tag = DT_REL;
1240         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_offset;
1241         ++i;
1242         dynamic [i].d_tag = DT_RELSZ;
1243         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_size;
1244         ++i;
1245         dynamic [i].d_tag = DT_RELENT;
1246         dynamic [i].d_un.d_val = sizeof (ElfReloc);
1247         ++i;
1248 #endif
1249         dynamic [i].d_tag = DT_RELCOUNT;
1250         dynamic [i].d_un.d_val = acfg->num_relocs;
1251         ++i;
1252
1253         /* Program header */
1254         memset (&progh, 0, sizeof (progh));
1255         progh [0].p_type = PT_LOAD;
1256         progh [0].p_filesz = progh [0].p_memsz = secth [SECT_DYNAMIC].sh_offset;
1257         progh [0].p_align = 4096;
1258         progh [0].p_flags = 5;
1259
1260         progh [1].p_type = PT_LOAD;
1261         progh [1].p_offset = secth [SECT_DYNAMIC].sh_offset;
1262         progh [1].p_vaddr = progh [1].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1263         progh [1].p_filesz = secth [SECT_BSS].sh_offset  - secth [SECT_DYNAMIC].sh_offset;
1264         progh [1].p_memsz = secth [SECT_BSS].sh_addr + secth [SECT_BSS].sh_size - secth [SECT_DYNAMIC].sh_addr;
1265         progh [1].p_align = 4096;
1266         progh [1].p_flags = 6;
1267
1268         progh [2].p_type = PT_DYNAMIC;
1269         progh [2].p_offset = secth [SECT_DYNAMIC].sh_offset;
1270         progh [2].p_vaddr = progh [2].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1271         progh [2].p_filesz = progh [2].p_memsz = secth [SECT_DYNAMIC].sh_size;
1272         progh [2].p_align = SIZEOF_VOID_P;
1273         progh [2].p_flags = 6;
1274
1275         /* Compute the addresses of the bin sections, so relocation can be done */
1276         for (i = 0; i < SECT_NUM; ++i) {
1277                 if (sections [i]) {
1278                         sections [i]->file_offset = secth [i].sh_offset;
1279                         sections [i]->virt_offset = secth [i].sh_addr;
1280                 }
1281         }
1282
1283         reloc_symbols (acfg, dynsym, secth, &dyn_str_table, TRUE);
1284         reloc_symbols (acfg, symtab, secth, &str_table, FALSE);
1285         relocs = resolve_relocations (acfg);
1286
1287         fwrite (&header, sizeof (header), 1, file);
1288         fwrite (&progh, sizeof (progh), 1, file);
1289         fwrite (hash, sizeof (int) * (hash [0] + hash [1] + 2), 1, file);
1290         fwrite (dynsym, sizeof (ElfSymbol) * hash [1], 1, file);
1291         fwrite (dyn_str_table.data->str, dyn_str_table.data->len, 1, file);
1292         /* .rel.dyn */
1293         fseek (file, secth [SECT_REL_DYN].sh_offset, SEEK_SET);
1294         fwrite (relocs, sizeof (ElfReloc), acfg->num_relocs, file);
1295
1296         /* .rela.dyn */
1297         fseek (file, secth [SECT_RELA_DYN].sh_offset, SEEK_SET);
1298         fwrite (relocs, secth [SECT_RELA_DYN].sh_size, 1, file);
1299
1300         /* .text */
1301         if (sections [SECT_TEXT]) {
1302                 fseek (file, secth [SECT_TEXT].sh_offset, SEEK_SET);
1303                 fwrite (sections [SECT_TEXT]->data, sections [SECT_TEXT]->cur_offset, 1, file);
1304         }
1305         /* .dynamic */
1306         fwrite (dynamic, sizeof (dynamic), 1, file);
1307
1308         /* .got.plt */
1309         size = secth [SECT_DYNAMIC].sh_addr;
1310         fwrite (&size, sizeof (size), 1, file);
1311
1312         /* .data */
1313         if (sections [SECT_DATA]) {
1314                 fseek (file, secth [SECT_DATA].sh_offset, SEEK_SET);
1315                 fwrite (sections [SECT_DATA]->data, sections [SECT_DATA]->cur_offset, 1, file);
1316         }
1317
1318         fseek (file, secth [SECT_DEBUG_FRAME].sh_offset, SEEK_SET);
1319         if (sections [SECT_DEBUG_FRAME])
1320                 fwrite (sections [SECT_DEBUG_FRAME]->data, sections [SECT_DEBUG_FRAME]->cur_offset, 1, file);
1321         fseek (file, secth [SECT_DEBUG_INFO].sh_offset, SEEK_SET);
1322         if (sections [SECT_DEBUG_INFO])
1323                 fwrite (sections [SECT_DEBUG_INFO]->data, sections [SECT_DEBUG_INFO]->cur_offset, 1, file);
1324         fseek (file, secth [SECT_DEBUG_ABBREV].sh_offset, SEEK_SET);
1325         if (sections [SECT_DEBUG_ABBREV])
1326                 fwrite (sections [SECT_DEBUG_ABBREV]->data, sections [SECT_DEBUG_ABBREV]->cur_offset, 1, file);
1327         fseek (file, secth [SECT_DEBUG_LINE].sh_offset, SEEK_SET);
1328         if (sections [SECT_DEBUG_LINE])
1329                 fwrite (sections [SECT_DEBUG_LINE]->data, sections [SECT_DEBUG_LINE]->cur_offset, 1, file);
1330         fseek (file, secth [SECT_DEBUG_LINE].sh_offset, SEEK_SET);
1331         if (sections [SECT_DEBUG_LOC])
1332                 fwrite (sections [SECT_DEBUG_LOC]->data, sections [SECT_DEBUG_LOC]->cur_offset, 1, file);
1333         fseek (file, secth [SECT_SHSTRTAB].sh_offset, SEEK_SET);
1334         fwrite (sh_str_table.data->str, sh_str_table.data->len, 1, file);
1335         fseek (file, secth [SECT_SYMTAB].sh_offset, SEEK_SET);
1336         fwrite (symtab, sizeof (ElfSymbol) * num_local_syms, 1, file);
1337         fseek (file, secth [SECT_STRTAB].sh_offset, SEEK_SET);
1338         fwrite (str_table.data->str, str_table.data->len, 1, file);
1339         /*g_print ("file_offset %d vs %d\n", file_offset, ftell (file));*/
1340         /*g_assert (file_offset >= ftell (file));*/
1341         fseek (file, file_offset, SEEK_SET);
1342         fwrite (&secth, sizeof (secth), 1, file);
1343         fclose (file);
1344
1345         return 0;
1346 }
1347
1348 #endif /* USE_ELF_WRITER */
1349
1350 #endif /* USE_BIN_WRITER */
1351
1352 /* ASM WRITER */
1353
1354 static void
1355 asm_writer_emit_start (MonoImageWriter *acfg)
1356 {
1357 }
1358
1359 static int
1360 asm_writer_emit_writeout (MonoImageWriter *acfg)
1361 {
1362         fclose (acfg->fp);
1363
1364         return 0;
1365 }
1366
1367 static void
1368 asm_writer_emit_unset_mode (MonoImageWriter *acfg)
1369 {
1370         if (acfg->mode == EMIT_NONE)
1371                 return;
1372         fprintf (acfg->fp, "\n");
1373         acfg->mode = EMIT_NONE;
1374 }
1375
1376 static void
1377 asm_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1378 {
1379         asm_writer_emit_unset_mode (acfg);
1380 #if defined(PLATFORM_WIN32)
1381         fprintf (acfg->fp, ".section %s\n", section_name);
1382 #elif defined(__MACH__)
1383         if (strcmp(section_name, ".bss") == 0)
1384                 fprintf (acfg->fp, "%s\n", ".data");
1385         else
1386                 fprintf (acfg->fp, "%s\n", section_name);
1387 #elif defined(sparc)
1388         /* For solaris as, GNU as should accept the same */
1389         fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1390 #elif defined(__arm__)
1391         /* ARM gas doesn't seem to like subsections of .bss */
1392         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data")) {
1393                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1394         } else {
1395                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1396                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1397         }
1398 #else
1399         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data") || !strcmp (section_name, ".bss")) {
1400                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1401         } else {
1402                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1403                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1404         }
1405 #endif
1406 }
1407
1408 static void
1409 asm_writer_emit_symbol_type (MonoImageWriter *acfg, const char *name, gboolean func)
1410 {
1411         const char *stype;
1412
1413         if (func)
1414                 stype = "function";
1415         else
1416                 stype = "object";
1417
1418         asm_writer_emit_unset_mode (acfg);
1419 #if defined(__MACH__)
1420
1421 #elif defined(sparc) || defined(__arm__)
1422         fprintf (acfg->fp, "\t.type %s,#%s\n", name, stype);
1423 #elif defined(PLATFORM_WIN32)
1424
1425 #elif defined(__x86_64__) || defined(__i386__)
1426         fprintf (acfg->fp, "\t.type %s,@%s\n", name, stype);
1427 #else
1428         fprintf (acfg->fp, "\t.type %s,@%s\n", name, stype);
1429 #endif
1430 }
1431
1432 static void
1433 asm_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1434 {
1435         asm_writer_emit_unset_mode (acfg);
1436 #if  (defined(__ppc__) && defined(__MACH__)) || defined(PLATFORM_WIN32)
1437     // mach-o always uses a '_' prefix.
1438         fprintf (acfg->fp, "\t.globl _%s\n", name);
1439 #else
1440         fprintf (acfg->fp, "\t.globl %s\n", name);
1441 #endif
1442
1443         asm_writer_emit_symbol_type (acfg, name, func);
1444 }
1445
1446 static void
1447 asm_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1448 {
1449         asm_writer_emit_unset_mode (acfg);
1450
1451         fprintf (acfg->fp, "\t.local %s\n", name);
1452
1453         asm_writer_emit_symbol_type (acfg, name, func);
1454 }
1455
1456 static void
1457 asm_writer_emit_label (MonoImageWriter *acfg, const char *name)
1458 {
1459         asm_writer_emit_unset_mode (acfg);
1460 #if (defined(__ppc__) && defined(__MACH__)) || defined(PLATFORM_WIN32)
1461     // mach-o always uses a '_' prefix.
1462         fprintf (acfg->fp, "_%s:\n", name);
1463 #else
1464         fprintf (acfg->fp, "%s:\n", name);
1465 #endif
1466
1467 #if defined(PLATFORM_WIN32)
1468         /* Emit a normal label too */
1469         fprintf (acfg->fp, "%s:\n", name);
1470 #endif
1471 }
1472
1473 static void
1474 asm_writer_emit_string (MonoImageWriter *acfg, const char *value)
1475 {
1476         asm_writer_emit_unset_mode (acfg);
1477         fprintf (acfg->fp, "\t%s \"%s\"\n", AS_STRING_DIRECTIVE, value);
1478 }
1479
1480 static void
1481 asm_writer_emit_line (MonoImageWriter *acfg)
1482 {
1483         asm_writer_emit_unset_mode (acfg);
1484         fprintf (acfg->fp, "\n");
1485 }
1486
1487 static void
1488 asm_writer_emit_alignment (MonoImageWriter *acfg, int size)
1489 {
1490         asm_writer_emit_unset_mode (acfg);
1491 #if defined(__arm__)
1492         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1493 #elif defined(__ppc__) && defined(__MACH__)
1494         // the mach-o assembler specifies alignments as powers of 2.
1495         fprintf (acfg->fp, "\t.align %d\t; ilog2\n", ilog2(size));
1496 #elif defined(__powerpc__)
1497         /* ignore on linux/ppc */
1498 #else
1499         fprintf (acfg->fp, "\t.align %d\n", size);
1500 #endif
1501 }
1502
1503 static void
1504 asm_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1505 {
1506         asm_writer_emit_unset_mode (acfg);
1507 #if defined(__x86_64__)
1508         fprintf (acfg->fp, "\t.quad %s\n", target ? target : "0");
1509 #elif defined(sparc) && SIZEOF_VOID_P == 8
1510         fprintf (acfg->fp, "\t.xword %s\n", target ? target : "0");
1511 #else
1512         fprintf (acfg->fp, "\t.long %s\n", target ? target : "0");
1513 #endif
1514 }
1515
1516 static void
1517 asm_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1518 {
1519         asm_writer_emit_unset_mode (acfg);
1520         asm_writer_emit_alignment (acfg, sizeof (gpointer));
1521         asm_writer_emit_pointer_unaligned (acfg, target);
1522 }
1523
1524 static char *byte_to_str;
1525
1526 static void
1527 asm_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1528 {
1529         int i;
1530         if (acfg->mode != EMIT_BYTE) {
1531                 acfg->mode = EMIT_BYTE;
1532                 acfg->col_count = 0;
1533         }
1534
1535         if (byte_to_str == NULL) {
1536                 byte_to_str = g_new0 (char, 256 * 8);
1537                 for (i = 0; i < 256; ++i) {
1538                         sprintf (byte_to_str + (i * 8), ",%d", i);
1539                 }
1540         }
1541
1542         for (i = 0; i < size; ++i, ++acfg->col_count) {
1543                 if ((acfg->col_count % 32) == 0)
1544                         fprintf (acfg->fp, "\n\t.byte %d", buf [i]);
1545                 else
1546                         fputs (byte_to_str + (buf [i] * 8), acfg->fp);
1547         }
1548 }
1549
1550 static inline void
1551 asm_writer_emit_int16 (MonoImageWriter *acfg, int value)
1552 {
1553         if (acfg->mode != EMIT_WORD) {
1554                 acfg->mode = EMIT_WORD;
1555                 acfg->col_count = 0;
1556         }
1557         if ((acfg->col_count++ % 8) == 0)
1558 #if defined(__MACH__)
1559                 fprintf (acfg->fp, "\n\t.short ");
1560 #elif defined(__arm__)
1561                 /* FIXME: Use .hword on other archs as well */
1562                 fprintf (acfg->fp, "\n\t.hword ");
1563 #else
1564                 fprintf (acfg->fp, "\n\t.word ");
1565 #endif
1566         else
1567                 fprintf (acfg->fp, ", ");
1568         fprintf (acfg->fp, "%d", value);
1569 }
1570
1571 static inline void
1572 asm_writer_emit_int32 (MonoImageWriter *acfg, int value)
1573 {
1574         if (acfg->mode != EMIT_LONG) {
1575                 acfg->mode = EMIT_LONG;
1576                 acfg->col_count = 0;
1577         }
1578         if ((acfg->col_count++ % 8) == 0)
1579                 fprintf (acfg->fp, "\n\t.long ");
1580         else
1581                 fprintf (acfg->fp, ",");
1582         fprintf (acfg->fp, "%d", value);
1583 }
1584
1585 static void
1586 asm_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1587 {
1588         if (acfg->mode != EMIT_LONG) {
1589                 acfg->mode = EMIT_LONG;
1590                 acfg->col_count = 0;
1591         }
1592         if ((acfg->col_count++ % 8) == 0)
1593                 fprintf (acfg->fp, "\n\t.long ");
1594         else
1595                 fprintf (acfg->fp, ",");
1596         if (offset > 0)
1597                 fprintf (acfg->fp, "%s - %s + %d", end, start, offset);
1598         else if (offset < 0)
1599                 fprintf (acfg->fp, "%s - %s %d", end, start, offset);
1600         else
1601                 fprintf (acfg->fp, "%s - %s", end, start);
1602 }
1603
1604 static void
1605 asm_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1606 {
1607         asm_writer_emit_unset_mode (acfg);
1608 #if defined(__MACH__)
1609         fprintf (acfg->fp, "\t.space %d\n", num);
1610 #else
1611         fprintf (acfg->fp, "\t.skip %d\n", num);
1612 #endif
1613 }
1614
1615 /* EMIT FUNCTIONS */
1616
1617 void
1618 img_writer_emit_start (MonoImageWriter *acfg)
1619 {
1620 #ifdef USE_BIN_WRITER
1621         if (acfg->use_bin_writer)
1622                 bin_writer_emit_start (acfg);
1623         else
1624                 asm_writer_emit_start (acfg);
1625 #else
1626         asm_writer_emit_start (acfg);
1627 #endif
1628 }
1629
1630 void
1631 img_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1632 {
1633 #ifdef USE_BIN_WRITER
1634         if (acfg->use_bin_writer)
1635                 bin_writer_emit_section_change (acfg, section_name, subsection_index);
1636         else
1637                 asm_writer_emit_section_change (acfg, section_name, subsection_index);
1638 #else
1639         asm_writer_emit_section_change (acfg, section_name, subsection_index);
1640 #endif
1641
1642         acfg->current_section = section_name;
1643         acfg->current_subsection = subsection_index;
1644 }
1645
1646 void
1647 img_writer_emit_push_section (MonoImageWriter *acfg, const char *section_name, int subsection)
1648 {
1649         g_assert (acfg->stack_pos < 16 - 1);
1650         acfg->section_stack [acfg->stack_pos] = acfg->current_section;
1651         acfg->subsection_stack [acfg->stack_pos] = acfg->current_subsection;
1652         acfg->stack_pos ++;
1653
1654         img_writer_emit_section_change (acfg, section_name, subsection);
1655 }
1656
1657 void
1658 img_writer_emit_pop_section (MonoImageWriter *acfg)
1659 {
1660         g_assert (acfg->stack_pos > 0);
1661         acfg->stack_pos --;
1662         img_writer_emit_section_change (acfg, acfg->section_stack [acfg->stack_pos], acfg->subsection_stack [acfg->stack_pos]);
1663 }
1664
1665 void
1666 img_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1667 {
1668 #ifdef USE_BIN_WRITER
1669         if (acfg->use_bin_writer)
1670                 bin_writer_emit_global (acfg, name, func);
1671         else
1672                 asm_writer_emit_global (acfg, name, func);
1673 #else
1674         asm_writer_emit_global (acfg, name, func);
1675 #endif
1676 }
1677
1678 void
1679 img_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1680 {
1681 #ifdef USE_BIN_WRITER
1682         if (acfg->use_bin_writer)
1683                 bin_writer_emit_local_symbol (acfg, name, end_label, func);
1684         else
1685                 asm_writer_emit_local_symbol (acfg, name, end_label, func);
1686 #else
1687         asm_writer_emit_local_symbol (acfg, name, end_label, func);
1688 #endif
1689 }
1690
1691 void
1692 img_writer_emit_label (MonoImageWriter *acfg, const char *name)
1693 {
1694 #ifdef USE_BIN_WRITER
1695         if (acfg->use_bin_writer)
1696                 bin_writer_emit_label (acfg, name);
1697         else
1698                 asm_writer_emit_label (acfg, name);
1699 #else
1700         asm_writer_emit_label (acfg, name);
1701 #endif
1702 }
1703
1704 void
1705 img_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1706 {
1707 #ifdef USE_BIN_WRITER
1708         if (acfg->use_bin_writer)
1709                 bin_writer_emit_bytes (acfg, buf, size);
1710         else
1711                 asm_writer_emit_bytes (acfg, buf, size);
1712 #else
1713         asm_writer_emit_bytes (acfg, buf, size);
1714 #endif
1715 }
1716
1717 void
1718 img_writer_emit_string (MonoImageWriter *acfg, const char *value)
1719 {
1720 #ifdef USE_BIN_WRITER
1721         if (acfg->use_bin_writer)
1722                 bin_writer_emit_string (acfg, value);
1723         else
1724                 asm_writer_emit_string (acfg, value);
1725 #else
1726         asm_writer_emit_string (acfg, value);
1727 #endif
1728 }
1729
1730 void
1731 img_writer_emit_line (MonoImageWriter *acfg)
1732 {
1733 #ifdef USE_BIN_WRITER
1734         if (acfg->use_bin_writer)
1735                 bin_writer_emit_line (acfg);
1736         else
1737                 asm_writer_emit_line (acfg);
1738 #else
1739                 asm_writer_emit_line (acfg);
1740 #endif
1741 }
1742
1743 void
1744 img_writer_emit_alignment (MonoImageWriter *acfg, int size)
1745 {
1746 #ifdef USE_BIN_WRITER
1747         if (acfg->use_bin_writer)
1748                 bin_writer_emit_alignment (acfg, size);
1749         else
1750                 asm_writer_emit_alignment (acfg, size);
1751 #else
1752         asm_writer_emit_alignment (acfg, size);
1753 #endif
1754 }
1755
1756 void
1757 img_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1758 {
1759 #ifdef USE_BIN_WRITER
1760         if (acfg->use_bin_writer)
1761                 bin_writer_emit_pointer_unaligned (acfg, target);
1762         else
1763                 asm_writer_emit_pointer_unaligned (acfg, target);
1764 #else
1765         asm_writer_emit_pointer_unaligned (acfg, target);
1766 #endif
1767 }
1768
1769 void
1770 img_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1771 {
1772 #ifdef USE_BIN_WRITER
1773         if (acfg->use_bin_writer)
1774                 bin_writer_emit_pointer (acfg, target);
1775         else
1776                 asm_writer_emit_pointer (acfg, target);
1777 #else
1778         asm_writer_emit_pointer (acfg, target);
1779 #endif
1780 }
1781
1782 void
1783 img_writer_emit_int16 (MonoImageWriter *acfg, int value)
1784 {
1785 #ifdef USE_BIN_WRITER
1786         if (acfg->use_bin_writer)
1787                 bin_writer_emit_int16 (acfg, value);
1788         else
1789                 asm_writer_emit_int16 (acfg, value);
1790 #else
1791         asm_writer_emit_int16 (acfg, value);
1792 #endif
1793 }
1794
1795 void
1796 img_writer_emit_int32 (MonoImageWriter *acfg, int value)
1797 {
1798 #ifdef USE_BIN_WRITER
1799         if (acfg->use_bin_writer)
1800                 bin_writer_emit_int32 (acfg, value);
1801         else
1802                 asm_writer_emit_int32 (acfg, value);
1803 #else
1804         asm_writer_emit_int32 (acfg, value);
1805 #endif
1806 }
1807
1808 void
1809 img_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1810 {
1811 #ifdef USE_BIN_WRITER
1812         if (acfg->use_bin_writer)
1813                 bin_writer_emit_symbol_diff (acfg, end, start, offset);
1814         else
1815                 asm_writer_emit_symbol_diff (acfg, end, start, offset);
1816 #else
1817         asm_writer_emit_symbol_diff (acfg, end, start, offset);
1818 #endif
1819 }
1820
1821 void
1822 img_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1823 {
1824 #ifdef USE_BIN_WRITER
1825         if (acfg->use_bin_writer)
1826                 bin_writer_emit_zero_bytes (acfg, num);
1827         else
1828                 asm_writer_emit_zero_bytes (acfg, num);
1829 #else
1830         asm_writer_emit_zero_bytes (acfg, num);
1831 #endif
1832 }
1833
1834 int
1835 img_writer_emit_writeout (MonoImageWriter *acfg)
1836 {
1837 #ifdef USE_BIN_WRITER
1838         if (acfg->use_bin_writer)
1839                 return bin_writer_emit_writeout (acfg);
1840         else
1841                 return asm_writer_emit_writeout (acfg);
1842 #else
1843                 return asm_writer_emit_writeout (acfg);
1844 #endif
1845 }
1846
1847 void
1848 img_writer_emit_byte (MonoImageWriter *acfg, guint8 val)
1849 {
1850         img_writer_emit_bytes (acfg, &val, 1);
1851 }
1852
1853 /*
1854  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
1855  * Do not advance PC.
1856  */
1857 void
1858 img_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
1859 {
1860         /* This is only supported by the bin writer */
1861 #ifdef USE_BIN_WRITER
1862         if (acfg->use_bin_writer)
1863                 bin_writer_emit_reloc (acfg, reloc_type, symbol, addend);
1864         else
1865                 g_assert_not_reached ();
1866 #else
1867                 g_assert_not_reached ();
1868 #endif
1869 }
1870
1871 /*
1872  * img_writer_emit_unset_mode:
1873  *
1874  *   Flush buffered data so it is safe to write to the output file from outside this
1875  * module. This is a nop for the binary writer.
1876  */
1877 void
1878 img_writer_emit_unset_mode (MonoImageWriter *acfg)
1879 {
1880         if (!acfg->use_bin_writer)
1881                 asm_writer_emit_unset_mode (acfg);
1882 }
1883
1884 /*
1885  * Return whenever the binary writer is supported on this platform.
1886  */
1887 gboolean
1888 bin_writer_supported (void)
1889 {
1890 #ifdef USE_BIN_WRITER
1891         return TRUE;
1892 #else
1893         return FALSE;
1894 #endif
1895 }
1896
1897 MonoImageWriter*
1898 img_writer_create (FILE *fp, gboolean use_bin_writer)
1899 {
1900         MonoImageWriter *w = g_new0 (MonoImageWriter, 1);
1901
1902 #ifndef USE_BIN_WRITER
1903         g_assert (!use_bin_writer);
1904 #endif
1905
1906         w->fp = fp;
1907         w->use_bin_writer = use_bin_writer;
1908         w->mempool = mono_mempool_new ();
1909
1910         return w;
1911 }
1912
1913 void
1914 img_writer_destroy (MonoImageWriter *w)
1915 {
1916         // FIXME: Free all the stuff
1917         mono_mempool_destroy (w->mempool);
1918         g_free (w);
1919 }