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 HOST_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 HOST_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 /*
  51  * The used assembler dialect
  52  * TARGET_ASM_APPLE == apple assembler on OSX
  53  * TARGET_ASM_GAS == GNU assembler
  54  */
  55 #if !defined(TARGET_ASM_APPLE) && !defined(TARGET_ASM_GAS)
  56 #ifdef __MACH__
  57 #define TARGET_ASM_APPLE
  58 #else
  59 #define TARGET_ASM_GAS
  60 #endif
  61 #endif
  62
  63 /*
  64  * Defines for the directives used by different assemblers
  65  */
  66 #if defined(TARGET_POWERPC) || defined(__MACH__)
  67 #define AS_STRING_DIRECTIVE ".asciz"
  68 #else
  69 #define AS_STRING_DIRECTIVE ".string"
  70 #endif
  71
  72 #define AS_INT32_DIRECTIVE ".long"
  73 #define AS_INT64_DIRECTIVE ".quad"
  74
  75 #if (defined(TARGET_AMD64) || defined(TARGET_POWERPC64)) && !defined(__mono_ilp32__)
  76 #define AS_POINTER_DIRECTIVE ".quad"
  77 #else
  78 #define AS_POINTER_DIRECTIVE ".long"
  79 #endif
  80
  81 #if defined(TARGET_ASM_APPLE)
  82 #define AS_INT16_DIRECTIVE ".short"
  83 #elif defined(TARGET_ASM_GAS)
  84 #define AS_INT16_DIRECTIVE ".hword"
  85 #else
  86 #define AS_INT16_DIRECTIVE ".word"
  87 #endif
  88
  89 #if defined(TARGET_ASM_APPLE)
  90 #define AS_SKIP_DIRECTIVE ".space"
  91 #else
  92 #define AS_SKIP_DIRECTIVE ".skip"
  93 #endif
  94
  95 #if defined(TARGET_ASM_APPLE)
  96 #define AS_GLOBAL_PREFIX "_"
  97 #else
  98 #define AS_GLOBAL_PREFIX ""
  99 #endif
 100
 101 #ifdef TARGET_ASM_APPLE
 102 #define AS_TEMP_LABEL_PREFIX "L"
 103 #else
 104 #define AS_TEMP_LABEL_PREFIX ".L"
 105 #endif
 106
 107 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
 108 #define ALIGN_PTR_TO(ptr,align) (gpointer)((((gssize)(ptr)) + (align - 1)) & (~(align - 1)))
 109 #define ROUND_DOWN(VALUE,SIZE)  ((VALUE) & ~((SIZE) - 1))
 110
 111 #if defined(TARGET_AMD64) && !defined(HOST_WIN32)
 112 #define USE_ELF_WRITER 1
 113 #define USE_ELF_RELA 1
 114 #endif
 115
 116 #if defined(TARGET_X86) && !defined(TARGET_WIN32)
 117 #define USE_ELF_WRITER 1
 118 #endif
 119
 120 #if defined(TARGET_ARM) && !defined(__MACH__)
 121 #define USE_ELF_WRITER 1
 122 #endif
 123
 124 #if defined(__mips__)
 125 #define USE_ELF_WRITER 1
 126 #endif
 127
 128 #if defined(USE_ELF_WRITER)
 129 #define USE_BIN_WRITER 1
 130 #endif
 131
 132 #ifdef USE_BIN_WRITER
 133
 134 typedef struct _BinSymbol BinSymbol;
 135 typedef struct _BinReloc BinReloc;
 136 typedef struct _BinSection BinSection;
 137
 138 #endif
 139
 140 /* emit mode */
 141 enum {
 142         EMIT_NONE,
 143         EMIT_BYTE,
 144         EMIT_WORD,
 145         EMIT_LONG
 146 };
 147
 148 struct _MonoImageWriter {
 149         MonoMemPool *mempool;
 150         char *outfile;
 151         gboolean use_bin_writer;
 152         const char *current_section;
 153         int current_subsection;
 154         const char *section_stack [16];
 155         int subsection_stack [16];
 156         int stack_pos;
 157         FILE *fp;
 158         /* Bin writer */
 159 #ifdef USE_BIN_WRITER
 160         BinSymbol *symbols;
 161         BinSection *sections;
 162         BinSection *cur_section;
 163         BinReloc *relocations;
 164         GHashTable *labels;
 165         int num_relocs;
 166         guint8 *out_buf;
 167         int out_buf_size, out_buf_pos;
 168 #endif
 169         /* Asm writer */
 170         char *tmpfname;
 171         int mode; /* emit mode */
 172         int col_count; /* bytes emitted per .byte line */
 173         int label_gen;
 174 };
 175
 176 static G_GNUC_UNUSED int
 177 ilog2(register int value)
 178 {
 179         int count = -1;
 180         while (value & ~0xf) count += 4, value >>= 4;
 181         while (value) count++, value >>= 1;
 182         return count;
 183 }
 184
 185 #ifdef USE_BIN_WRITER
 186
 187 typedef struct _BinLabel BinLabel;
 188 struct _BinLabel {
 189         char *name;
 190         BinSection *section;
 191         int offset;
 192 };
 193
 194 struct _BinReloc {
 195         BinReloc *next;
 196         char *val1;
 197         char *val2;
 198         BinSection *val2_section;
 199         int val2_offset;
 200         int offset;
 201         BinSection *section;
 202         int section_offset;
 203         int reloc_type;
 204 };
 205
 206 struct _BinSymbol {
 207         BinSymbol *next;
 208         char *name;
 209         BinSection *section;
 210         int offset;
 211         gboolean is_function;
 212         gboolean is_global;
 213         char *end_label;
 214 };
 215
 216 struct _BinSection {
 217         BinSection *next;
 218         BinSection *parent;
 219         char *name;
 220         int subsection;
 221         guint8 *data;
 222         int data_len;
 223         int cur_offset;
 224         int file_offset;
 225         int virt_offset;
 226         int shidx;
 227         guint64 addr;
 228         gboolean has_addr;
 229 };
 230
 231 static void
 232 bin_writer_emit_start (MonoImageWriter *acfg)
 233 {
 234         acfg->labels = g_hash_table_new (g_str_hash, g_str_equal);
 235 }
 236
 237 static void
 238 bin_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
 239 {
 240         BinSection *section;
 241
 242         if (acfg->cur_section && acfg->cur_section->subsection == subsection_index
 243                         && strcmp (acfg->cur_section->name, section_name) == 0)
 244                 return;
 245         for (section = acfg->sections; section; section = section->next) {
 246                 if (section->subsection == subsection_index && strcmp (section->name, section_name) == 0) {
 247                         acfg->cur_section = section;
 248                         return;
 249                 }
 250         }
 251         if (!section) {
 252                 section = g_new0 (BinSection, 1);
 253                 section->name = g_strdup (section_name);
 254                 section->subsection = subsection_index;
 255                 section->next = acfg->sections;
 256                 acfg->sections = section;
 257                 acfg->cur_section = section;
 258         }
 259 }
 260
 261 static void
 262 bin_writer_set_section_addr (MonoImageWriter *acfg, guint64 addr)
 263 {
 264         acfg->cur_section->addr = addr;
 265         acfg->cur_section->has_addr = TRUE;
 266 }
 267
 268 static void
 269 bin_writer_emit_symbol_inner (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean is_global, gboolean func)
 270 {
 271         BinSymbol *symbol = g_new0 (BinSymbol, 1);
 272         symbol->name = g_strdup (name);
 273         if (end_label)
 274                 symbol->end_label = g_strdup (end_label);
 275         symbol->is_function = func;
 276         symbol->is_global = is_global;
 277         symbol->section = acfg->cur_section;
 278         /* FIXME: we align after this call... */
 279         symbol->offset = symbol->section->cur_offset;
 280         symbol->next = acfg->symbols;
 281         acfg->symbols = symbol;
 282 }
 283
 284 static void
 285 bin_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
 286 {
 287         bin_writer_emit_symbol_inner (acfg, name, NULL, TRUE, func);
 288 }
 289
 290 static void
 291 bin_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
 292 {
 293         bin_writer_emit_symbol_inner (acfg, name, end_label, FALSE, func);
 294 }
 295
 296 static void
 297 bin_writer_emit_label (MonoImageWriter *acfg, const char *name)
 298 {
 299         BinLabel *label = g_new0 (BinLabel, 1);
 300         label->name = g_strdup (name);
 301         label->section = acfg->cur_section;
 302         label->offset = acfg->cur_section->cur_offset;
 303         g_hash_table_insert (acfg->labels, label->name, label);
 304 }
 305
 306 static void
 307 bin_writer_emit_ensure_buffer (BinSection *section, int size)
 308 {
 309         int new_offset = section->cur_offset + size;
 310         if (new_offset >= section->data_len) {
 311                 int new_size = section->data_len? section->data_len * 2: 256;
 312                 guint8 *data;
 313                 while (new_size <= new_offset)
 314                         new_size *= 2;
 315                 data = g_malloc0 (new_size);
 316                 memcpy (data, section->data, section->data_len);
 317                 g_free (section->data);
 318                 section->data = data;
 319                 section->data_len = new_size;
 320         }
 321 }
 322
 323 static void
 324 bin_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
 325 {
 326         bin_writer_emit_ensure_buffer (acfg->cur_section, size);
 327         memcpy (acfg->cur_section->data + acfg->cur_section->cur_offset, buf, size);
 328         acfg->cur_section->cur_offset += size;
 329 }
 330
 331 static void
 332 bin_writer_emit_string (MonoImageWriter *acfg, const char *value)
 333 {
 334         int size = strlen (value) + 1;
 335         bin_writer_emit_bytes (acfg, (const guint8*)value, size);
 336 }
 337
 338 static void
 339 bin_writer_emit_line (MonoImageWriter *acfg)
 340 {
 341         /* Nothing to do in binary writer */
 342 }
 343
 344 static void
 345 bin_writer_emit_alignment (MonoImageWriter *acfg, int size)
 346 {
 347         int offset = acfg->cur_section->cur_offset;
 348         int add;
 349         offset += (size - 1);
 350         offset &= ~(size - 1);
 351         add = offset - acfg->cur_section->cur_offset;
 352         if (add) {
 353                 bin_writer_emit_ensure_buffer (acfg->cur_section, add);
 354                 acfg->cur_section->cur_offset += add;
 355         }
 356 }
 357
 358 static void
 359 bin_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
 360 {
 361         BinReloc *reloc;
 362
 363         if (!target)
 364                 // FIXME:
 365                 g_assert_not_reached ();
 366         reloc = g_new0 (BinReloc, 1);
 367         reloc->val1 = g_strdup (target);
 368         reloc->section = acfg->cur_section;
 369         reloc->section_offset = acfg->cur_section->cur_offset;
 370         reloc->next = acfg->relocations;
 371         acfg->relocations = reloc;
 372         if (strcmp (reloc->section->name, ".data") == 0) {
 373                 acfg->num_relocs++;
 374                 //g_print ("reloc: %s at %d\n", target, acfg->cur_section->cur_offset);
 375         }
 376         acfg->cur_section->cur_offset += sizeof (gpointer);
 377 }
 378
 379 static void
 380 bin_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
 381 {
 382         bin_writer_emit_alignment (acfg, sizeof (gpointer));
 383         bin_writer_emit_pointer_unaligned (acfg, target);
 384 }
 385
 386 static void
 387 bin_writer_emit_int16 (MonoImageWriter *acfg, int value)
 388 {
 389         guint8 *data;
 390         bin_writer_emit_ensure_buffer (acfg->cur_section, 2);
 391         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 392         acfg->cur_section->cur_offset += 2;
 393         /* FIXME: little endian */
 394         data [0] = value;
 395         data [1] = value >> 8;
 396 }
 397
 398 static void
 399 bin_writer_emit_int32 (MonoImageWriter *acfg, int value)
 400 {
 401         guint8 *data;
 402         bin_writer_emit_ensure_buffer (acfg->cur_section, 4);
 403         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 404         acfg->cur_section->cur_offset += 4;
 405         /* FIXME: little endian */
 406         data [0] = value;
 407         data [1] = value >> 8;
 408         data [2] = value >> 16;
 409         data [3] = value >> 24;
 410 }
 411
 412 static BinReloc*
 413 create_reloc (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 414 {
 415         BinReloc *reloc;
 416         reloc = mono_mempool_alloc0 (acfg->mempool, sizeof (BinReloc));
 417         reloc->val1 = mono_mempool_strdup (acfg->mempool, end);
 418         if (strcmp (start, ".") == 0) {
 419                 reloc->val2_section = acfg->cur_section;
 420                 reloc->val2_offset = acfg->cur_section->cur_offset;
 421         } else {
 422                 reloc->val2 = mono_mempool_strdup (acfg->mempool, start);
 423         }
 424         reloc->offset = offset;
 425         reloc->section = acfg->cur_section;
 426         reloc->section_offset = acfg->cur_section->cur_offset;
 427         reloc->next = acfg->relocations;
 428         acfg->relocations = reloc;
 429         return reloc;
 430 }
 431
 432 static void
 433 bin_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 434 {
 435         create_reloc (acfg, end, start, offset);
 436         acfg->cur_section->cur_offset += 4;
 437         /*if (strcmp (reloc->section->name, ".data") == 0) {
 438                 acfg->num_relocs++;
 439                 g_print ("reloc: %s - %s + %d at %d\n", end, start, offset, acfg->cur_section->cur_offset - 4);
 440         }*/
 441 }
 442
 443 /*
 444  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
 445  * Do not advance PC.
 446  */
 447 static G_GNUC_UNUSED void
 448 bin_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
 449 {
 450         BinReloc *reloc = create_reloc (acfg, symbol, ".", addend);
 451         reloc->reloc_type = reloc_type;
 452 }
 453
 454 static void
 455 bin_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
 456 {
 457         bin_writer_emit_ensure_buffer (acfg->cur_section, num);
 458         acfg->cur_section->cur_offset += num;
 459 }
 460
 461 #ifdef USE_ELF_WRITER
 462
 463 enum {
 464         SECT_NULL,
 465         SECT_HASH,
 466         SECT_DYNSYM,
 467         SECT_DYNSTR,
 468         SECT_REL_DYN,
 469         SECT_RELA_DYN,
 470         SECT_TEXT,
 471         SECT_DYNAMIC,
 472         SECT_GOT_PLT,
 473         SECT_DATA,
 474         SECT_BSS,
 475         SECT_DEBUG_FRAME,
 476         SECT_DEBUG_INFO,
 477         SECT_DEBUG_ABBREV,
 478         SECT_DEBUG_LINE,
 479         SECT_DEBUG_LOC,
 480         SECT_SHSTRTAB,
 481         SECT_SYMTAB,
 482         SECT_STRTAB,
 483         SECT_NUM
 484 };
 485
 486 #if SIZEOF_VOID_P == 4
 487
 488 typedef Elf32_Ehdr ElfHeader;
 489 typedef Elf32_Shdr ElfSectHeader;
 490 typedef Elf32_Phdr ElfProgHeader;
 491 typedef Elf32_Sym ElfSymbol;
 492 typedef Elf32_Rel ElfReloc;
 493 typedef Elf32_Rela ElfRelocA;
 494 typedef Elf32_Dyn ElfDynamic;
 495
 496 #else
 497
 498 typedef Elf64_Ehdr ElfHeader;
 499 typedef Elf64_Shdr ElfSectHeader;
 500 typedef Elf64_Phdr ElfProgHeader;
 501 typedef Elf64_Sym ElfSymbol;
 502 typedef Elf64_Rel ElfReloc;
 503 typedef Elf64_Rela ElfRelocA;
 504 typedef Elf64_Dyn ElfDynamic;
 505
 506 #endif
 507
 508 typedef struct {
 509         const char *name;
 510         int type;
 511         int esize;
 512         int flags;
 513         int align;
 514 } SectInfo;
 515
 516 static SectInfo section_info [] = {
 517         {"", 0, 0, 0, 0},
 518         {".hash", SHT_HASH, 4, 2, SIZEOF_VOID_P},
 519         {".dynsym", SHT_DYNSYM, sizeof (ElfSymbol), 2, SIZEOF_VOID_P},
 520         {".dynstr", SHT_STRTAB, 0, 2, 1},
 521         {".rel.dyn", SHT_REL, sizeof (ElfReloc), 2, SIZEOF_VOID_P},
 522         {".rela.dyn", SHT_RELA, sizeof (ElfRelocA), 2, SIZEOF_VOID_P},
 523         {".text", SHT_PROGBITS, 0, 6, 4096},
 524         {".dynamic", SHT_DYNAMIC, sizeof (ElfDynamic), 3, SIZEOF_VOID_P},
 525         {".got.plt", SHT_PROGBITS, SIZEOF_VOID_P, 3, SIZEOF_VOID_P},
 526         {".data", SHT_PROGBITS, 0, 3, 8},
 527         {".bss", SHT_NOBITS, 0, 3, 8},
 528         {".debug_frame", SHT_PROGBITS, 0, 0, 8},
 529         {".debug_info", SHT_PROGBITS, 0, 0, 1},
 530         {".debug_abbrev", SHT_PROGBITS, 0, 0, 1},
 531         {".debug_line", SHT_PROGBITS, 0, 0, 1},
 532         {".debug_loc", SHT_PROGBITS, 0, 0, 1},
 533         {".shstrtab", SHT_STRTAB, 0, 0, 1},
 534         {".symtab", SHT_SYMTAB, sizeof (ElfSymbol), 0, SIZEOF_VOID_P},
 535         {".strtab", SHT_STRTAB, 0, 0, 1}
 536 };
 537
 538 typedef struct {
 539         GString *data;
 540         GHashTable *hash;
 541 } ElfStrTable;
 542
 543 static int
 544 str_table_add (ElfStrTable *table, const char* value)
 545 {
 546         int idx;
 547         if (!table->data) {
 548                 table->data = g_string_new_len ("", 1);
 549                 table->hash = g_hash_table_new (g_str_hash, g_str_equal);
 550         }
 551         idx = GPOINTER_TO_UINT (g_hash_table_lookup (table->hash, value));
 552         if (idx)
 553                 return idx;
 554         idx = table->data->len;
 555         g_string_append (table->data, value);
 556         g_string_append_c (table->data, 0);
 557         g_hash_table_insert (table->hash, (void*)value, GUINT_TO_POINTER (idx));
 558         return idx;
 559 }
 560
 561 static void
 562 append_subsection (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection *sect, BinSection *add)
 563 {
 564         int offset = sect->cur_offset;
 565         /*offset += (sheaders [sect->shidx].sh_addralign - 1);
 566         offset &= ~(sheaders [sect->shidx].sh_addralign - 1);*/
 567         /*
 568          * FIXME: we shouldn't align subsections at all, but if we don't then the
 569          * stuff inside the subsections which is aligned won't get aligned.
 570          */
 571         if (strcmp (sect->name, ".debug_line") != 0) {
 572                 offset += (8 - 1);
 573                 offset &= ~(8 - 1);
 574         }
 575         bin_writer_emit_ensure_buffer (sect, offset);
 576         //g_print ("section %s aligned to %d from %d\n", sect->name, offset, sect->cur_offset);
 577         sect->cur_offset = offset;
 578
 579         bin_writer_emit_ensure_buffer (sect, add->cur_offset);
 580         memcpy (sect->data + sect->cur_offset, add->data, add->cur_offset);
 581         add->parent = sect;
 582         sect->cur_offset += add->cur_offset;
 583         add->cur_offset = offset; /* it becomes the offset in the parent section */
 584         //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);
 585         add->data = NULL;
 586         add->data_len = 0;
 587 }
 588
 589 /* merge the subsections */
 590 static int
 591 collect_sections (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection **out, int num)
 592 {
 593         int i, j, maxs, num_sections;
 594         BinSection *sect;
 595
 596         num_sections = 0;
 597         maxs = 0;
 598         for (sect = acfg->sections; sect; sect = sect->next) {
 599                 if (sect->subsection == 0) {
 600                         out [num_sections++] = sect;
 601                         g_assert (num_sections < num);
 602                 }
 603                 maxs = MAX (maxs, sect->subsection);
 604         }
 605         for (i = 0; i < num_sections; i++) {
 606                 for (j = 1; j <= maxs; ++j) {
 607                         for (sect = acfg->sections; sect; sect = sect->next) {
 608                                 if (sect->subsection == j && strcmp (out [i]->name, sect->name) == 0) {
 609                                         append_subsection (acfg, sheaders, out [i], sect);
 610                                 }
 611                         }
 612                 }
 613         }
 614         return num_sections;
 615 }
 616
 617 static unsigned long
 618 elf_hash (const unsigned char *name)
 619 {
 620         unsigned long h = 0, g;
 621         while (*name) {
 622                 h = (h << 4) + *name++;
 623                 if ((g = h & 0xf0000000))
 624                         h ^= g >> 24;
 625                 h &= ~g;
 626         }
 627         return h;
 628 }
 629
 630 #define NUM_BUCKETS 17
 631
 632 static int*
 633 build_hash (MonoImageWriter *acfg, int num_sections, ElfStrTable *dynstr)
 634 {
 635         int *data;
 636         int num_symbols = 1 + num_sections + 3;
 637         BinSymbol *symbol;
 638
 639         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 640                 if (!symbol->is_global)
 641                         continue;
 642                 num_symbols++;
 643                 str_table_add (dynstr, symbol->name);
 644                 /*g_print ("adding sym: %s\n", symbol->name);*/
 645         }
 646         str_table_add (dynstr, "__bss_start");
 647         str_table_add (dynstr, "_edata");
 648         str_table_add (dynstr, "_end");
 649
 650         data = g_new0 (int, num_symbols + 2 + NUM_BUCKETS);
 651         data [0] = NUM_BUCKETS;
 652         data [1] = num_symbols;
 653
 654         return data;
 655 }
 656
 657 static gsize
 658 get_label_addr (MonoImageWriter *acfg, const char *name)
 659 {
 660         int offset;
 661         BinLabel *lab;
 662         BinSection *section;
 663         gsize value;
 664
 665         lab = g_hash_table_lookup (acfg->labels, name);
 666         if (!lab)
 667                 g_error ("Undefined label: '%s'.\n", name);
 668         section = lab->section;
 669         offset = lab->offset;
 670         if (section->parent) {
 671                 value = section->parent->virt_offset + section->cur_offset + offset;
 672         } else {
 673                 value = section->virt_offset + offset;
 674         }
 675         return value;
 676 }
 677
 678 static ElfSymbol*
 679 collect_syms (MonoImageWriter *acfg, int *hash, ElfStrTable *strtab, ElfSectHeader *sheaders, int *num_syms)
 680 {
 681         ElfSymbol *symbols;
 682         BinSymbol *symbol;
 683         BinSection *section;
 684         int i;
 685         int *bucket;
 686         int *chain;
 687         unsigned long hashc;
 688
 689         if (hash)
 690                 symbols = g_new0 (ElfSymbol, hash [1]);
 691         else {
 692                 i = 0;
 693                 for (symbol = acfg->symbols; symbol; symbol = symbol->next)
 694                         i ++;
 695
 696                 symbols = g_new0 (ElfSymbol, i + SECT_NUM + 10); /* FIXME */
 697         }
 698
 699         /* the first symbol is undef, all zeroes */
 700         i = 1;
 701         if (sheaders) {
 702                 int j;
 703                 for (j = 1; j < SECT_NUM; ++j) {
 704                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 705                         symbols [i].st_shndx = j;
 706                         symbols [i].st_value = sheaders [j].sh_addr;
 707                         ++i;
 708                 }
 709         } else {
 710                 for (section = acfg->sections; section; section = section->next) {
 711                         if (section->parent)
 712                                 continue;
 713                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 714                         if (strcmp (section->name, ".text") == 0) {
 715                                 symbols [i].st_shndx = SECT_TEXT;
 716                                 section->shidx = SECT_TEXT;
 717                                 section->file_offset = 4096;
 718                                 symbols [i].st_value = section->virt_offset;
 719                         } else if (strcmp (section->name, ".data") == 0) {
 720                                 symbols [i].st_shndx = SECT_DATA;
 721                                 section->shidx = SECT_DATA;
 722                                 section->file_offset = 4096 + 28; /* FIXME */
 723                                 symbols [i].st_value = section->virt_offset;
 724                         } else if (strcmp (section->name, ".bss") == 0) {
 725                                 symbols [i].st_shndx = SECT_BSS;
 726                                 section->shidx = SECT_BSS;
 727                                 section->file_offset = 4096 + 28 + 8; /* FIXME */
 728                                 symbols [i].st_value = section->virt_offset;
 729                         }
 730                         ++i;
 731                 }
 732         }
 733         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 734                 int offset;
 735                 BinLabel *lab;
 736                 if (!symbol->is_global && hash)
 737                         continue;
 738                 symbols [i].st_info = ELF32_ST_INFO (symbol->is_global ? STB_GLOBAL : STB_LOCAL, symbol->is_function? STT_FUNC : STT_OBJECT);
 739                 symbols [i].st_name = str_table_add (strtab, symbol->name);
 740                 /*g_print ("sym name %s tabled to %d\n", symbol->name, symbols [i].st_name);*/
 741                 section = symbol->section;
 742                 symbols [i].st_shndx = section->parent? section->parent->shidx: section->shidx;
 743                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 744                 offset = lab->offset;
 745                 if (section->parent) {
 746                         symbols [i].st_value = section->parent->virt_offset + section->cur_offset + offset;
 747                 } else {
 748                         symbols [i].st_value = section->virt_offset + offset;
 749                 }
 750
 751                 if (symbol->end_label) {
 752                         BinLabel *elab = g_hash_table_lookup (acfg->labels, symbol->end_label);
 753                         g_assert (elab);
 754                         symbols [i].st_size = elab->offset - lab->offset;
 755                 }
 756                 ++i;
 757         }
 758         /* add special symbols */
 759         symbols [i].st_name = str_table_add (strtab, "__bss_start");
 760         symbols [i].st_shndx = 0xfff1;
 761         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 762         ++i;
 763         symbols [i].st_name = str_table_add (strtab, "_edata");
 764         symbols [i].st_shndx = 0xfff1;
 765         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 766         ++i;
 767         symbols [i].st_name = str_table_add (strtab, "_end");
 768         symbols [i].st_shndx = 0xfff1;
 769         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 770         ++i;
 771
 772         if (num_syms)
 773                 *num_syms = i;
 774
 775         /* add to hash table */
 776         if (hash) {
 777                 bucket = hash + 2;
 778                 chain = hash + 2 + hash [0];
 779                 for (i = 0; i < hash [1]; ++i) {
 780                         int slot;
 781                         /*g_print ("checking %d '%s' (sym %d)\n", symbols [i].st_name, strtab->data->str + symbols [i].st_name, i);*/
 782                         if (!symbols [i].st_name)
 783                                 continue;
 784                         hashc = elf_hash ((guint8*)strtab->data->str + symbols [i].st_name);
 785                         slot = hashc % hash [0];
 786                         /*g_print ("hashing '%s' at slot %d (sym %d)\n", strtab->data->str + symbols [i].st_name, slot, i);*/
 787                         if (bucket [slot]) {
 788                                 chain [i] = bucket [slot];
 789                                 bucket [slot] = i;
 790                         } else {
 791                                 bucket [slot] = i;
 792                         }
 793                 }
 794         }
 795         return symbols;
 796 }
 797
 798 static void
 799 reloc_symbols (MonoImageWriter *acfg, ElfSymbol *symbols, ElfSectHeader *sheaders, ElfStrTable *strtab, gboolean dynamic)
 800 {
 801         BinSection *section;
 802         BinSymbol *symbol;
 803         int i;
 804
 805         i = 1;
 806         if (dynamic) {
 807                 for (section = acfg->sections; section; section = section->next) {
 808                         if (section->parent)
 809                                 continue;
 810                         symbols [i].st_value = sheaders [section->shidx].sh_addr;
 811                         ++i;
 812                 }
 813         } else {
 814                 for (i = 1; i < SECT_NUM; ++i) {
 815                         symbols [i].st_value = sheaders [i].sh_addr;
 816                 }
 817         }
 818         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 819                 int offset;
 820                 BinLabel *lab;
 821                 if (dynamic && !symbol->is_global)
 822                         continue;
 823                 section = symbol->section;
 824                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 825                 offset = lab->offset;
 826                 if (section->parent) {
 827                         symbols [i].st_value = sheaders [section->parent->shidx].sh_addr + section->cur_offset + offset;
 828                 } else {
 829                         symbols [i].st_value = sheaders [section->shidx].sh_addr + offset;
 830                 }
 831                 ++i;
 832         }
 833         /* __bss_start */
 834         symbols [i].st_value = sheaders [SECT_BSS].sh_addr;
 835         ++i;
 836         /* _edata */
 837         symbols [i].st_value = sheaders [SECT_DATA].sh_addr + sheaders [SECT_DATA].sh_size;
 838         ++i;
 839         /* _end */
 840         symbols [i].st_value = sheaders [SECT_BSS].sh_addr + sheaders [SECT_BSS].sh_size;
 841         ++i;
 842 }
 843
 844 static void
 845 resolve_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 **out_data, gsize *out_vaddr, gsize *out_start_val, gsize *out_end_val)
 846 {
 847         guint8 *data;
 848         gssize end_val, start_val;
 849         gsize vaddr;
 850
 851         end_val = get_label_addr (acfg, reloc->val1);
 852         if (reloc->val2) {
 853                 start_val = get_label_addr (acfg, reloc->val2);
 854         } else if (reloc->val2_section) {
 855                 start_val = reloc->val2_offset;
 856                 if (reloc->val2_section->parent)
 857                         start_val += reloc->val2_section->parent->virt_offset + reloc->val2_section->cur_offset;
 858                 else
 859                         start_val += reloc->val2_section->virt_offset;
 860         } else {
 861                 start_val = 0;
 862         }
 863         end_val = end_val - start_val + reloc->offset;
 864         if (reloc->section->parent) {
 865                 data = reloc->section->parent->data;
 866                 data += reloc->section->cur_offset;
 867                 data += reloc->section_offset;
 868                 vaddr = reloc->section->parent->virt_offset;
 869                 vaddr += reloc->section->cur_offset;
 870                 vaddr += reloc->section_offset;
 871         } else {
 872                 data = reloc->section->data;
 873                 data += reloc->section_offset;
 874                 vaddr = reloc->section->virt_offset;
 875                 vaddr += reloc->section_offset;
 876         }
 877
 878         *out_start_val = start_val;
 879         *out_end_val = end_val;
 880         *out_data = data;
 881         *out_vaddr = vaddr;
 882 }
 883
 884 #ifdef USE_ELF_RELA
 885
 886 static ElfRelocA*
 887 resolve_relocations (MonoImageWriter *acfg)
 888 {
 889         BinReloc *reloc;
 890         guint8 *data;
 891         gsize end_val, start_val;
 892         ElfRelocA *rr;
 893         int i;
 894         gsize vaddr;
 895
 896         rr = g_new0 (ElfRelocA, acfg->num_relocs);
 897         i = 0;
 898
 899         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 900                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 901                 /* FIXME: little endian */
 902                 data [0] = end_val;
 903                 data [1] = end_val >> 8;
 904                 data [2] = end_val >> 16;
 905                 data [3] = end_val >> 24;
 906                 // FIXME:
 907                 if (start_val == 0 && reloc->val1 [0] != '.') {
 908                         rr [i].r_offset = vaddr;
 909                         rr [i].r_info = R_X86_64_RELATIVE;
 910                         rr [i].r_addend = end_val;
 911                         ++i;
 912                         g_assert (i <= acfg->num_relocs);
 913                 }
 914         }
 915         return rr;
 916 }
 917
 918 #else /* USE_ELF_RELA */
 919
 920 static void
 921 do_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 *data, gssize addr)
 922 {
 923 #ifdef TARGET_ARM
 924         /*
 925          * We use the official ARM relocation types, but implement only the stuff actually
 926          * needed by the code we generate.
 927          */
 928         switch (reloc->reloc_type) {
 929         case R_ARM_CALL:
 930         case R_ARM_JUMP24: {
 931                 guint32 *code = (guint32*)(gpointer)data;
 932                 guint32 ins = *code;
 933                 int diff = addr;
 934
 935                 if (reloc->reloc_type == R_ARM_CALL)
 936                         /* bl */
 937                         g_assert (data [3] == 0xeb);
 938                 else
 939                         /* b */
 940                         g_assert (data [3] == 0xea);
 941                 if (diff >= 0 && diff <= 33554431) {
 942                         diff >>= 2;
 943                         ins = (ins & 0xff000000) | diff;
 944                         *code = ins;
 945                 } else if (diff <= 0 && diff >= -33554432) {
 946                         diff >>= 2;
 947                         ins = (ins & 0xff000000) | (diff & ~0xff000000);
 948                         *code = ins;
 949                 } else {
 950                         g_assert_not_reached ();
 951                 }
 952                 break;
 953         }
 954         case R_ARM_ALU_PC_G0_NC: {
 955                 /* Generated by emit_plt () */
 956                 guint8 *code = data;
 957                 guint32 val = addr;
 958
 959                 g_assert (val <= 0xffffff);
 960                 if (val & 0xff0000)
 961                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, (val & 0xFF0000) >> 16, 16);
 962                 else
 963                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, 0, 0);
 964                 ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_IP, (val & 0xFF00) >> 8, 24);
 965                 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, val & 0xFF);
 966                 break;
 967         }
 968         default:
 969                 g_assert_not_reached ();
 970         }
 971 #else
 972         g_assert_not_reached ();
 973 #endif
 974 }
 975
 976 static ElfReloc*
 977 resolve_relocations (MonoImageWriter *acfg)
 978 {
 979         BinReloc *reloc;
 980         guint8 *data;
 981         gsize end_val, start_val;
 982         ElfReloc *rr;
 983         int i;
 984         gsize vaddr;
 985
 986         rr = g_new0 (ElfReloc, acfg->num_relocs);
 987         i = 0;
 988
 989         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 990                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 991                 /* FIXME: little endian */
 992                 if (reloc->reloc_type) {
 993                         /* Must be static */
 994                         g_assert (start_val > 0);
 995                         do_reloc (acfg, reloc, data, end_val);
 996                 } else {
 997                         data [0] = end_val;
 998                         data [1] = end_val >> 8;
 999                         data [2] = end_val >> 16;
1000                         data [3] = end_val >> 24;
1001                 }
1002                 // FIXME:
1003                 if (start_val == 0 && reloc->val1 [0] != '.') {
1004                         rr [i].r_offset = vaddr;
1005                         rr [i].r_info = R_386_RELATIVE;
1006                         ++i;
1007                         g_assert (i <= acfg->num_relocs);
1008                 }
1009         }
1010         return rr;
1011 }
1012
1013 #endif /* USE_ELF_RELA */
1014
1015 static void
1016 bin_writer_fwrite (MonoImageWriter *acfg, void *val, size_t size, size_t nmemb)
1017 {
1018         if (acfg->fp)
1019                 fwrite (val, size, nmemb, acfg->fp);
1020         else {
1021                 g_assert (acfg->out_buf_pos + (size * nmemb) <= acfg->out_buf_size);
1022                 memcpy (acfg->out_buf + acfg->out_buf_pos, val, size * nmemb);
1023                 acfg->out_buf_pos += (size * nmemb);
1024         }
1025 }
1026
1027 static void
1028 bin_writer_fseek (MonoImageWriter *acfg, int offset)
1029 {
1030         if (acfg->fp)
1031                 fseek (acfg->fp, offset, SEEK_SET);
1032         else
1033                 acfg->out_buf_pos = offset;
1034 }
1035
1036 static int normal_sections [] = { SECT_DATA, SECT_DEBUG_FRAME, SECT_DEBUG_INFO, SECT_DEBUG_ABBREV, SECT_DEBUG_LINE, SECT_DEBUG_LOC };
1037
1038 static int
1039 bin_writer_emit_writeout (MonoImageWriter *acfg)
1040 {
1041         FILE *file;
1042         ElfHeader header;
1043         ElfProgHeader progh [3];
1044         ElfSectHeader secth [SECT_NUM];
1045 #ifdef USE_ELF_RELA
1046         ElfRelocA *relocs;
1047 #else
1048         ElfReloc *relocs;
1049 #endif
1050         ElfStrTable str_table = {NULL, NULL};
1051         ElfStrTable sh_str_table = {NULL, NULL};
1052         ElfStrTable dyn_str_table = {NULL, NULL};
1053         BinSection* all_sections [32];
1054         BinSection* sections [SECT_NUM];
1055         ElfSymbol *dynsym;
1056         ElfSymbol *symtab;
1057         ElfDynamic dynamic [14];
1058         int *hash;
1059         int i, num_sections, file_offset, virt_offset, size, num_symtab;
1060         int num_local_syms;
1061
1062         file = acfg->fp;
1063
1064         /* Section headers */
1065         memset (&secth, 0, sizeof (secth));
1066         memset (&dynamic, 0, sizeof (dynamic));
1067         memset (&header, 0, sizeof (header));
1068
1069         for (i = 1; i < SECT_NUM; ++i) {
1070                 secth [i].sh_name = str_table_add (&sh_str_table, section_info [i].name);
1071                 secth [i].sh_type = section_info [i].type;
1072                 secth [i].sh_addralign = section_info [i].align;
1073                 secth [i].sh_flags = section_info [i].flags;
1074                 secth [i].sh_entsize = section_info [i].esize;
1075         }
1076         secth [SECT_DYNSYM].sh_info = SIZEOF_VOID_P == 4 ? 4 : 2;
1077         secth [SECT_SYMTAB].sh_info = SIZEOF_VOID_P == 4 ? 20 : 17;
1078         secth [SECT_HASH].sh_link = SECT_DYNSYM;
1079         secth [SECT_DYNSYM].sh_link = SECT_DYNSTR;
1080         secth [SECT_REL_DYN].sh_link = SECT_DYNSYM;
1081         secth [SECT_RELA_DYN].sh_link = SECT_DYNSYM;
1082         secth [SECT_DYNAMIC].sh_link = SECT_DYNSTR;
1083         secth [SECT_SYMTAB].sh_link = SECT_STRTAB;
1084
1085         num_sections = collect_sections (acfg, secth, all_sections, 16);
1086         hash = build_hash (acfg, num_sections, &dyn_str_table);
1087         num_symtab = hash [1]; /* FIXME */
1088 #if 0
1089         g_print ("num_sections: %d\n", num_sections);
1090         g_print ("dynsym: %d, dynstr size: %d\n", hash [1], (int)dyn_str_table.data->len);
1091         for (i = 0; i < num_sections; ++i) {
1092                 g_print ("section %s, size: %d, %x\n", all_sections [i]->name, all_sections [i]->cur_offset, all_sections [i]->cur_offset);
1093         }
1094 #endif
1095         /* Associate the bin sections with the ELF sections */
1096         memset (sections, 0, sizeof (sections));
1097         for (i = 0; i < num_sections; ++i) {
1098                 BinSection *sect = all_sections [i];
1099                 int j;
1100
1101                 for (j = 0; j < SECT_NUM; ++j) {
1102                         if (strcmp (sect->name, section_info [j].name) == 0) {
1103                                 sect->shidx = j;
1104                                 break;
1105                         }
1106                 }
1107
1108                 sections [all_sections [i]->shidx] = sect;
1109         }
1110
1111         /* at this point we know where in the file the first segment sections go */
1112         dynsym = collect_syms (acfg, hash, &dyn_str_table, NULL, NULL);
1113         num_local_syms = hash [1];
1114         symtab = collect_syms (acfg, NULL, &str_table, secth, &num_local_syms);
1115
1116         file_offset = virt_offset = sizeof (header) + sizeof (progh);
1117         secth [SECT_HASH].sh_addr = secth [SECT_HASH].sh_offset = file_offset;
1118         size = sizeof (int) * (2 + hash [0] + hash [1]);
1119         virt_offset = (file_offset += size);
1120         secth [SECT_HASH].sh_size = size;
1121         secth [SECT_DYNSYM].sh_addr = secth [SECT_DYNSYM].sh_offset = file_offset;
1122         size = sizeof (ElfSymbol) * hash [1];
1123         virt_offset = (file_offset += size);
1124         secth [SECT_DYNSYM].sh_size = size;
1125         secth [SECT_DYNSTR].sh_addr = secth [SECT_DYNSTR].sh_offset = file_offset;
1126         size = dyn_str_table.data->len;
1127         virt_offset = (file_offset += size);
1128         secth [SECT_DYNSTR].sh_size = size;
1129         file_offset += 4-1;
1130         file_offset &= ~(4-1);
1131         secth [SECT_REL_DYN].sh_addr = secth [SECT_REL_DYN].sh_offset = file_offset;
1132 #ifndef USE_ELF_RELA
1133         size = sizeof (ElfReloc) * acfg->num_relocs;
1134 #else
1135         size = 0;
1136 #endif
1137         virt_offset = (file_offset += size);
1138         secth [SECT_REL_DYN].sh_size = size;
1139         secth [SECT_RELA_DYN].sh_addr = secth [SECT_RELA_DYN].sh_offset = file_offset;
1140 #ifdef USE_ELF_RELA
1141         size = sizeof (ElfRelocA) * acfg->num_relocs;
1142 #else
1143         size = 0;
1144 #endif
1145         virt_offset = (file_offset += size);
1146         secth [SECT_RELA_DYN].sh_size = size;
1147
1148         file_offset = ALIGN_TO (file_offset, secth [SECT_TEXT].sh_addralign);
1149         virt_offset = file_offset;
1150         secth [SECT_TEXT].sh_addr = secth [SECT_TEXT].sh_offset = file_offset;
1151         if (sections [SECT_TEXT]) {
1152                 if (sections [SECT_TEXT]->has_addr) {
1153                         secth [SECT_TEXT].sh_addr = sections [SECT_TEXT]->addr;
1154                         secth [SECT_TEXT].sh_flags &= ~SHF_ALLOC;
1155                 }
1156                 size = sections [SECT_TEXT]->cur_offset;
1157                 secth [SECT_TEXT].sh_size = size;
1158                 file_offset += size;
1159         }
1160
1161         file_offset = ALIGN_TO (file_offset, secth [SECT_DYNAMIC].sh_addralign);
1162         virt_offset = file_offset;
1163
1164         /* .dynamic, .got.plt, .data, .bss here */
1165         /* Have to increase the virt offset since these go to a separate segment */
1166         virt_offset += PAGESIZE;
1167         secth [SECT_DYNAMIC].sh_addr = virt_offset;
1168         secth [SECT_DYNAMIC].sh_offset = file_offset;
1169         size = sizeof (dynamic);
1170         secth [SECT_DYNAMIC].sh_size = size;
1171         file_offset += size;
1172         virt_offset += size;
1173
1174         file_offset = ALIGN_TO (file_offset, secth [SECT_GOT_PLT].sh_addralign);
1175         virt_offset = ALIGN_TO (virt_offset, secth [SECT_GOT_PLT].sh_addralign);
1176         secth [SECT_GOT_PLT].sh_addr = virt_offset;
1177         secth [SECT_GOT_PLT].sh_offset = file_offset;
1178         size = 3 * SIZEOF_VOID_P;
1179         secth [SECT_GOT_PLT].sh_size = size;
1180         file_offset += size;
1181         virt_offset += size;
1182
1183         file_offset = ALIGN_TO (file_offset, secth [SECT_DATA].sh_addralign);
1184         virt_offset = ALIGN_TO (virt_offset, secth [SECT_DATA].sh_addralign);
1185         secth [SECT_DATA].sh_addr = virt_offset;
1186         secth [SECT_DATA].sh_offset = file_offset;
1187         if (sections [SECT_DATA]) {
1188                 size = sections [SECT_DATA]->cur_offset;
1189                 secth [SECT_DATA].sh_size = size;
1190                 file_offset += size;
1191                 virt_offset += size;
1192         }
1193
1194         file_offset = ALIGN_TO (file_offset, secth [SECT_BSS].sh_addralign);
1195         virt_offset = ALIGN_TO (virt_offset, secth [SECT_BSS].sh_addralign);
1196         secth [SECT_BSS].sh_addr = virt_offset;
1197         secth [SECT_BSS].sh_offset = file_offset;
1198         if (sections [SECT_BSS]) {
1199                 size = sections [SECT_BSS]->cur_offset;
1200                 secth [SECT_BSS].sh_size = size;
1201         }
1202
1203         /* virtual doesn't matter anymore */
1204         file_offset = ALIGN_TO (file_offset, secth [SECT_DEBUG_FRAME].sh_addralign);
1205         secth [SECT_DEBUG_FRAME].sh_offset = file_offset;
1206         if (sections [SECT_DEBUG_FRAME])
1207                 size = sections [SECT_DEBUG_FRAME]->cur_offset;
1208         else
1209                 size = 0;
1210         secth [SECT_DEBUG_FRAME].sh_size = size;
1211         file_offset += size;
1212
1213         secth [SECT_DEBUG_INFO].sh_offset = file_offset;
1214         if (sections [SECT_DEBUG_INFO])
1215                 size = sections [SECT_DEBUG_INFO]->cur_offset;
1216         else
1217                 size = 0;
1218         secth [SECT_DEBUG_INFO].sh_size = size;
1219         file_offset += size;
1220
1221         secth [SECT_DEBUG_ABBREV].sh_offset = file_offset;
1222         if (sections [SECT_DEBUG_ABBREV])
1223                 size = sections [SECT_DEBUG_ABBREV]->cur_offset;
1224         else
1225                 size = 0;
1226         secth [SECT_DEBUG_ABBREV].sh_size = size;
1227         file_offset += size;
1228
1229         secth [SECT_DEBUG_LINE].sh_offset = file_offset;
1230         if (sections [SECT_DEBUG_LINE])
1231                 size = sections [SECT_DEBUG_LINE]->cur_offset;
1232         else
1233                 size = 0;
1234         secth [SECT_DEBUG_LINE].sh_size = size;
1235         file_offset += size;
1236
1237         secth [SECT_DEBUG_LOC].sh_offset = file_offset;
1238         if (sections [SECT_DEBUG_LOC])
1239                 size = sections [SECT_DEBUG_LOC]->cur_offset;
1240         else
1241                 size = 0;
1242         secth [SECT_DEBUG_LOC].sh_size = size;
1243         file_offset += size;
1244
1245         file_offset = ALIGN_TO (file_offset, secth [SECT_SHSTRTAB].sh_addralign);
1246         secth [SECT_SHSTRTAB].sh_offset = file_offset;
1247         size = sh_str_table.data->len;
1248         secth [SECT_SHSTRTAB].sh_size = size;
1249         file_offset += size;
1250
1251         file_offset = ALIGN_TO (file_offset, secth [SECT_SYMTAB].sh_addralign);
1252         secth [SECT_SYMTAB].sh_offset = file_offset;
1253         size = sizeof (ElfSymbol) * num_local_syms;
1254         secth [SECT_SYMTAB].sh_size = size;
1255         file_offset += size;
1256
1257         file_offset = ALIGN_TO (file_offset, secth [SECT_STRTAB].sh_addralign);
1258         secth [SECT_STRTAB].sh_offset = file_offset;
1259         size = str_table.data->len;
1260         secth [SECT_STRTAB].sh_size = size;
1261         file_offset += size;
1262
1263         for (i = 1; i < SECT_NUM; ++i) {
1264                 if (section_info [i].esize != 0)
1265                         g_assert (secth [i].sh_size % section_info [i].esize == 0);
1266         }
1267
1268         file_offset += 4-1;
1269         file_offset &= ~(4-1);
1270
1271         header.e_ident [EI_MAG0] = ELFMAG0;
1272         header.e_ident [EI_MAG1] = ELFMAG1;
1273         header.e_ident [EI_MAG2] = ELFMAG2;
1274         header.e_ident [EI_MAG3] = ELFMAG3;
1275         header.e_ident [EI_CLASS] = SIZEOF_VOID_P == 4 ? ELFCLASS32 : ELFCLASS64;
1276         header.e_ident [EI_DATA] = ELFDATA2LSB;
1277         header.e_ident [EI_VERSION] = EV_CURRENT;
1278         header.e_ident [EI_OSABI] = ELFOSABI_NONE;
1279         header.e_ident [EI_ABIVERSION] = 0;
1280         for (i = EI_PAD; i < EI_NIDENT; ++i)
1281                 header.e_ident [i] = 0;
1282
1283         header.e_type = ET_DYN;
1284 #if defined(TARGET_X86)
1285         header.e_machine = EM_386;
1286 #elif defined(TARGET_AMD64)
1287         header.e_machine = EM_X86_64;
1288 #elif defined(TARGET_ARM)
1289         header.e_machine = EM_ARM;
1290 #else
1291         g_assert_not_reached ();
1292 #endif
1293         header.e_version = 1;
1294
1295         header.e_phoff = sizeof (header);
1296         header.e_ehsize = sizeof (header);
1297         header.e_phentsize = sizeof (ElfProgHeader);
1298         header.e_phnum = 3;
1299         header.e_entry = secth [SECT_TEXT].sh_addr;
1300         header.e_shstrndx = SECT_SHSTRTAB;
1301         header.e_shentsize = sizeof (ElfSectHeader);
1302         header.e_shnum = SECT_NUM;
1303         header.e_shoff = file_offset;
1304
1305         /* dynamic data */
1306         i = 0;
1307         dynamic [i].d_tag = DT_HASH;
1308         dynamic [i].d_un.d_val = secth [SECT_HASH].sh_offset;
1309         ++i;
1310         dynamic [i].d_tag = DT_STRTAB;
1311         dynamic [i].d_un.d_val = secth [SECT_DYNSTR].sh_offset;
1312         ++i;
1313         dynamic [i].d_tag = DT_SYMTAB;
1314         dynamic [i].d_un.d_val = secth [SECT_DYNSYM].sh_offset;
1315         ++i;
1316         dynamic [i].d_tag = DT_STRSZ;
1317         dynamic [i].d_un.d_val = dyn_str_table.data->len;
1318         ++i;
1319         dynamic [i].d_tag = DT_SYMENT;
1320         dynamic [i].d_un.d_val = sizeof (ElfSymbol);
1321         ++i;
1322 #ifdef USE_ELF_RELA
1323         dynamic [i].d_tag = DT_RELA;
1324         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_offset;
1325         ++i;
1326         dynamic [i].d_tag = DT_RELASZ;
1327         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_size;
1328         ++i;
1329         dynamic [i].d_tag = DT_RELAENT;
1330         dynamic [i].d_un.d_val = sizeof (ElfRelocA);
1331         ++i;
1332 #else
1333         dynamic [i].d_tag = DT_REL;
1334         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_offset;
1335         ++i;
1336         dynamic [i].d_tag = DT_RELSZ;
1337         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_size;
1338         ++i;
1339         dynamic [i].d_tag = DT_RELENT;
1340         dynamic [i].d_un.d_val = sizeof (ElfReloc);
1341         ++i;
1342 #endif
1343         dynamic [i].d_tag = DT_RELCOUNT;
1344         dynamic [i].d_un.d_val = acfg->num_relocs;
1345         ++i;
1346
1347         /* Program header */
1348         memset (&progh, 0, sizeof (progh));
1349         progh [0].p_type = PT_LOAD;
1350         progh [0].p_filesz = progh [0].p_memsz = secth [SECT_DYNAMIC].sh_offset;
1351         progh [0].p_align = 4096;
1352         progh [0].p_flags = 5;
1353
1354         progh [1].p_type = PT_LOAD;
1355         progh [1].p_offset = secth [SECT_DYNAMIC].sh_offset;
1356         progh [1].p_vaddr = progh [1].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1357         progh [1].p_filesz = secth [SECT_BSS].sh_offset  - secth [SECT_DYNAMIC].sh_offset;
1358         progh [1].p_memsz = secth [SECT_BSS].sh_addr + secth [SECT_BSS].sh_size - secth [SECT_DYNAMIC].sh_addr;
1359         progh [1].p_align = 4096;
1360         progh [1].p_flags = 6;
1361
1362         progh [2].p_type = PT_DYNAMIC;
1363         progh [2].p_offset = secth [SECT_DYNAMIC].sh_offset;
1364         progh [2].p_vaddr = progh [2].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1365         progh [2].p_filesz = progh [2].p_memsz = secth [SECT_DYNAMIC].sh_size;
1366         progh [2].p_align = SIZEOF_VOID_P;
1367         progh [2].p_flags = 6;
1368
1369         /* Compute the addresses of the bin sections, so relocation can be done */
1370         for (i = 0; i < SECT_NUM; ++i) {
1371                 if (sections [i]) {
1372                         sections [i]->file_offset = secth [i].sh_offset;
1373                         sections [i]->virt_offset = secth [i].sh_addr;
1374                 }
1375         }
1376
1377         reloc_symbols (acfg, dynsym, secth, &dyn_str_table, TRUE);
1378         reloc_symbols (acfg, symtab, secth, &str_table, FALSE);
1379         relocs = resolve_relocations (acfg);
1380
1381         if (!acfg->fp) {
1382                 acfg->out_buf_size = file_offset + sizeof (secth);
1383                 acfg->out_buf = g_malloc (acfg->out_buf_size);
1384         }
1385
1386         bin_writer_fwrite (acfg, &header, sizeof (header), 1);
1387         bin_writer_fwrite (acfg, &progh, sizeof (progh), 1);
1388         bin_writer_fwrite (acfg, hash, sizeof (int) * (hash [0] + hash [1] + 2), 1);
1389         bin_writer_fwrite (acfg, dynsym, sizeof (ElfSymbol) * hash [1], 1);
1390         bin_writer_fwrite (acfg, dyn_str_table.data->str, dyn_str_table.data->len, 1);
1391         /* .rel.dyn */
1392         bin_writer_fseek (acfg, secth [SECT_REL_DYN].sh_offset);
1393         bin_writer_fwrite (acfg, relocs, sizeof (ElfReloc), acfg->num_relocs);
1394
1395         /* .rela.dyn */
1396         bin_writer_fseek (acfg, secth [SECT_RELA_DYN].sh_offset);
1397         bin_writer_fwrite (acfg, relocs, secth [SECT_RELA_DYN].sh_size, 1);
1398
1399         /* .text */
1400         if (sections [SECT_TEXT]) {
1401                 bin_writer_fseek (acfg, secth [SECT_TEXT].sh_offset);
1402                 bin_writer_fwrite (acfg, sections [SECT_TEXT]->data, sections [SECT_TEXT]->cur_offset, 1);
1403         }
1404         /* .dynamic */
1405         bin_writer_fwrite (acfg, dynamic, sizeof (dynamic), 1);
1406
1407         /* .got.plt */
1408         size = secth [SECT_DYNAMIC].sh_addr;
1409         bin_writer_fwrite (acfg, &size, sizeof (size), 1);
1410
1411         /* normal sections */
1412         for (i = 0; i < sizeof (normal_sections) / sizeof (normal_sections [0]); ++i) {
1413                 int sect = normal_sections [i];
1414                 if (sections [sect]) {
1415                         bin_writer_fseek (acfg, secth [sect].sh_offset);
1416                         bin_writer_fwrite (acfg, sections [sect]->data, sections [sect]->cur_offset, 1);
1417                 }
1418         }
1419
1420         bin_writer_fseek (acfg, secth [SECT_SHSTRTAB].sh_offset);
1421         bin_writer_fwrite (acfg, sh_str_table.data->str, sh_str_table.data->len, 1);
1422         bin_writer_fseek (acfg, secth [SECT_SYMTAB].sh_offset);
1423         bin_writer_fwrite (acfg, symtab, sizeof (ElfSymbol) * num_local_syms, 1);
1424         bin_writer_fseek (acfg, secth [SECT_STRTAB].sh_offset);
1425         bin_writer_fwrite (acfg, str_table.data->str, str_table.data->len, 1);
1426         /*g_print ("file_offset %d vs %d\n", file_offset, ftell (file));*/
1427         /*g_assert (file_offset >= ftell (file));*/
1428         bin_writer_fseek (acfg, file_offset);
1429         bin_writer_fwrite (acfg, &secth, sizeof (secth), 1);
1430
1431         if (acfg->fp)
1432                 fclose (acfg->fp);
1433
1434         return 0;
1435 }
1436
1437 #endif /* USE_ELF_WRITER */
1438
1439 #endif /* USE_BIN_WRITER */
1440
1441 /* ASM WRITER */
1442
1443 static void
1444 asm_writer_emit_start (MonoImageWriter *acfg)
1445 {
1446 }
1447
1448 static int
1449 asm_writer_emit_writeout (MonoImageWriter *acfg)
1450 {
1451         fclose (acfg->fp);
1452
1453         return 0;
1454 }
1455
1456 static void
1457 asm_writer_emit_unset_mode (MonoImageWriter *acfg)
1458 {
1459         if (acfg->mode == EMIT_NONE)
1460                 return;
1461         fprintf (acfg->fp, "\n");
1462         acfg->mode = EMIT_NONE;
1463 }
1464
1465 static void
1466 asm_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1467 {
1468         asm_writer_emit_unset_mode (acfg);
1469 #if defined(TARGET_ASM_APPLE)
1470         if (strcmp(section_name, ".bss") == 0)
1471                 fprintf (acfg->fp, "%s\n", ".data");
1472         else if (strstr (section_name, ".debug") == section_name) {
1473                 //g_assert (subsection_index == 0);
1474                 fprintf (acfg->fp, ".section __DWARF, __%s,regular,debug\n", section_name + 1);
1475         } else
1476                 fprintf (acfg->fp, "%s\n", section_name);
1477 #elif defined(TARGET_ARM) || defined(TARGET_POWERPC)
1478         /* ARM gas doesn't seem to like subsections of .bss */
1479         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data")) {
1480                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1481         } else {
1482                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1483                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1484         }
1485 #elif defined(HOST_WIN32)
1486         fprintf (acfg->fp, ".section %s\n", section_name);
1487 #else
1488         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data") || !strcmp (section_name, ".bss")) {
1489                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1490         } else {
1491                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1492                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1493         }
1494 #endif
1495 }
1496
1497 static inline
1498 const char *get_label (const char *s)
1499 {
1500 #ifdef TARGET_ASM_APPLE
1501         if (s [0] == '.' && s [1] == 'L')
1502                 /* apple uses "L" instead of ".L" to mark temporary labels */
1503                 s ++;
1504 #endif
1505         return s;
1506 }
1507
1508 static void
1509 asm_writer_emit_symbol_type (MonoImageWriter *acfg, const char *name, gboolean func)
1510 {
1511         const char *stype;
1512
1513         if (func)
1514                 stype = "function";
1515         else
1516                 stype = "object";
1517
1518         asm_writer_emit_unset_mode (acfg);
1519 #if defined(TARGET_ASM_APPLE)
1520
1521 #elif defined(TARGET_ARM)
1522         fprintf (acfg->fp, "\t.type %s,#%s\n", name, stype);
1523 #else
1524         fprintf (acfg->fp, "\t.type %s,@%s\n", name, stype);
1525 #endif
1526 }
1527
1528 static void
1529 asm_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1530 {
1531         asm_writer_emit_unset_mode (acfg);
1532 #if  (defined(__ppc__) && defined(TARGET_ASM_APPLE)) || (defined(HOST_WIN32) && !defined(MONO_CROSS_COMPILE))
1533     // mach-o always uses a '_' prefix.
1534         fprintf (acfg->fp, "\t.globl _%s\n", name);
1535 #else
1536         fprintf (acfg->fp, "\t.globl %s\n", name);
1537 #endif
1538
1539         asm_writer_emit_symbol_type (acfg, name, func);
1540 }
1541
1542 static void
1543 asm_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1544 {
1545         asm_writer_emit_unset_mode (acfg);
1546
1547 #ifndef TARGET_ASM_APPLE
1548         fprintf (acfg->fp, "\t.local %s\n", name);
1549 #endif
1550
1551         asm_writer_emit_symbol_type (acfg, name, func);
1552 }
1553
1554 static void
1555 asm_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1556 {
1557         asm_writer_emit_unset_mode (acfg);
1558
1559 #ifndef TARGET_ASM_APPLE
1560         fprintf (acfg->fp, "\t.size %s,%s-%s\n", name, end_label, name);
1561 #endif
1562 }
1563
1564 static void
1565 asm_writer_emit_label (MonoImageWriter *acfg, const char *name)
1566 {
1567         asm_writer_emit_unset_mode (acfg);
1568 #if defined(HOST_WIN32) && (defined(TARGET_X86) || defined(TARGET_AMD64))
1569         fprintf (acfg->fp, "_%s:\n", name);
1570 #if defined(HOST_WIN32)
1571         /* Emit a normal label too */
1572         fprintf (acfg->fp, "%s:\n", name);
1573 #endif
1574 #else
1575         fprintf (acfg->fp, "%s:\n", get_label (name));
1576 #endif
1577
1578 }
1579
1580 static void
1581 asm_writer_emit_string (MonoImageWriter *acfg, const char *value)
1582 {
1583         asm_writer_emit_unset_mode (acfg);
1584         fprintf (acfg->fp, "\t%s \"%s\"\n", AS_STRING_DIRECTIVE, value);
1585 }
1586
1587 static void
1588 asm_writer_emit_line (MonoImageWriter *acfg)
1589 {
1590         asm_writer_emit_unset_mode (acfg);
1591         fprintf (acfg->fp, "\n");
1592 }
1593
1594 static void
1595 asm_writer_emit_alignment (MonoImageWriter *acfg, int size)
1596 {
1597         asm_writer_emit_unset_mode (acfg);
1598 #if defined(TARGET_ARM)
1599         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1600 #elif defined(__ppc__) && defined(TARGET_ASM_APPLE)
1601         // the mach-o assembler specifies alignments as powers of 2.
1602         fprintf (acfg->fp, "\t.align %d\t; ilog2\n", ilog2(size));
1603 #elif defined(TARGET_ASM_GAS)
1604         fprintf (acfg->fp, "\t.balign %d\n", size);
1605 #else
1606         fprintf (acfg->fp, "\t.align %d\n", size);
1607 #endif
1608 }
1609
1610 static void
1611 asm_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1612 {
1613         asm_writer_emit_unset_mode (acfg);
1614         fprintf (acfg->fp, "\t%s %s\n", AS_POINTER_DIRECTIVE, target ? target : "0");
1615 }
1616
1617 static void
1618 asm_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1619 {
1620         asm_writer_emit_unset_mode (acfg);
1621         asm_writer_emit_alignment (acfg, sizeof (gpointer));
1622         asm_writer_emit_pointer_unaligned (acfg, target);
1623 }
1624
1625 static char *byte_to_str;
1626
1627 static void
1628 asm_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1629 {
1630         int i;
1631         if (acfg->mode != EMIT_BYTE) {
1632                 acfg->mode = EMIT_BYTE;
1633                 acfg->col_count = 0;
1634         }
1635
1636         if (byte_to_str == NULL) {
1637                 byte_to_str = g_new0 (char, 256 * 8);
1638                 for (i = 0; i < 256; ++i) {
1639                         sprintf (byte_to_str + (i * 8), ",%d", i);
1640                 }
1641         }
1642
1643         for (i = 0; i < size; ++i, ++acfg->col_count) {
1644                 if ((acfg->col_count % 32) == 0)
1645                         fprintf (acfg->fp, "\n\t.byte %d", buf [i]);
1646                 else
1647                         fputs (byte_to_str + (buf [i] * 8), acfg->fp);
1648         }
1649 }
1650
1651 static inline void
1652 asm_writer_emit_int16 (MonoImageWriter *acfg, int value)
1653 {
1654         if (acfg->mode != EMIT_WORD) {
1655                 acfg->mode = EMIT_WORD;
1656                 acfg->col_count = 0;
1657         }
1658         if ((acfg->col_count++ % 8) == 0)
1659                 fprintf (acfg->fp, "\n\t%s ", AS_INT16_DIRECTIVE);
1660         else
1661                 fprintf (acfg->fp, ", ");
1662         fprintf (acfg->fp, "%d", value);
1663 }
1664
1665 static inline void
1666 asm_writer_emit_int32 (MonoImageWriter *acfg, int value)
1667 {
1668         if (acfg->mode != EMIT_LONG) {
1669                 acfg->mode = EMIT_LONG;
1670                 acfg->col_count = 0;
1671         }
1672         if ((acfg->col_count++ % 8) == 0)
1673                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1674         else
1675                 fprintf (acfg->fp, ",");
1676         fprintf (acfg->fp, "%d", value);
1677 }
1678
1679 static void
1680 asm_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1681 {
1682 #ifdef TARGET_ASM_APPLE
1683         char symbol [128];
1684 #endif
1685
1686         if (acfg->mode != EMIT_LONG) {
1687                 acfg->mode = EMIT_LONG;
1688                 acfg->col_count = 0;
1689         }
1690
1691         // FIXME: This doesn't seem to work on the iphone
1692 #if 0
1693         //#ifdef TARGET_ASM_APPLE
1694         /* The apple assembler needs a separate symbol to be able to handle complex expressions */
1695         sprintf (symbol, "LTMP_SYM%d", acfg->label_gen);
1696         start = get_label (start);
1697         end = get_label (end);
1698         acfg->label_gen ++;
1699         if (offset > 0)
1700                 fprintf (acfg->fp, "\n%s=%s - %s + %d", symbol, end, start, offset);
1701         else if (offset < 0)
1702                 fprintf (acfg->fp, "\n%s=%s - %s %d", symbol, end, start, offset);
1703         else
1704                 fprintf (acfg->fp, "\n%s=%s - %s", symbol, end, start);
1705
1706         fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1707         fprintf (acfg->fp, "%s", symbol);
1708 #else
1709         start = get_label (start);
1710         end = get_label (end);
1711         if ((acfg->col_count++ % 8) == 0)
1712                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1713         else
1714                 fprintf (acfg->fp, ",");
1715         if (offset > 0)
1716                 fprintf (acfg->fp, "%s - %s + %d", end, start, offset);
1717         else if (offset < 0)
1718                 fprintf (acfg->fp, "%s - %s %d", end, start, offset);
1719         else
1720                 fprintf (acfg->fp, "%s - %s", end, start);
1721 #endif
1722 }
1723
1724 static void
1725 asm_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1726 {
1727         asm_writer_emit_unset_mode (acfg);
1728         fprintf (acfg->fp, "\t%s %d\n", AS_SKIP_DIRECTIVE, num);
1729 }
1730
1731 /* EMIT FUNCTIONS */
1732
1733 void
1734 img_writer_emit_start (MonoImageWriter *acfg)
1735 {
1736 #ifdef USE_BIN_WRITER
1737         if (acfg->use_bin_writer)
1738                 bin_writer_emit_start (acfg);
1739         else
1740                 asm_writer_emit_start (acfg);
1741 #else
1742         asm_writer_emit_start (acfg);
1743 #endif
1744 }
1745
1746 void
1747 img_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1748 {
1749 #ifdef USE_BIN_WRITER
1750         if (acfg->use_bin_writer)
1751                 bin_writer_emit_section_change (acfg, section_name, subsection_index);
1752         else
1753                 asm_writer_emit_section_change (acfg, section_name, subsection_index);
1754 #else
1755         asm_writer_emit_section_change (acfg, section_name, subsection_index);
1756 #endif
1757
1758         acfg->current_section = section_name;
1759         acfg->current_subsection = subsection_index;
1760 }
1761
1762 void
1763 img_writer_emit_push_section (MonoImageWriter *acfg, const char *section_name, int subsection)
1764 {
1765         g_assert (acfg->stack_pos < 16 - 1);
1766         acfg->section_stack [acfg->stack_pos] = acfg->current_section;
1767         acfg->subsection_stack [acfg->stack_pos] = acfg->current_subsection;
1768         acfg->stack_pos ++;
1769
1770         img_writer_emit_section_change (acfg, section_name, subsection);
1771 }
1772
1773 void
1774 img_writer_emit_pop_section (MonoImageWriter *acfg)
1775 {
1776         g_assert (acfg->stack_pos > 0);
1777         acfg->stack_pos --;
1778         img_writer_emit_section_change (acfg, acfg->section_stack [acfg->stack_pos], acfg->subsection_stack [acfg->stack_pos]);
1779 }
1780
1781 void
1782 img_writer_set_section_addr (MonoImageWriter *acfg, guint64 addr)
1783 {
1784 #ifdef USE_BIN_WRITER
1785         if (!acfg->use_bin_writer)
1786                 NOT_IMPLEMENTED;
1787         else
1788                 bin_writer_set_section_addr (acfg, addr);
1789 #else
1790         NOT_IMPLEMENTED;
1791 #endif
1792 }
1793
1794 void
1795 img_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1796 {
1797 #ifdef USE_BIN_WRITER
1798         if (acfg->use_bin_writer)
1799                 bin_writer_emit_global (acfg, name, func);
1800         else
1801                 asm_writer_emit_global (acfg, name, func);
1802 #else
1803         asm_writer_emit_global (acfg, name, func);
1804 #endif
1805 }
1806
1807 void
1808 img_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1809 {
1810 #ifdef USE_BIN_WRITER
1811         if (acfg->use_bin_writer)
1812                 bin_writer_emit_local_symbol (acfg, name, end_label, func);
1813         else
1814                 asm_writer_emit_local_symbol (acfg, name, end_label, func);
1815 #else
1816         asm_writer_emit_local_symbol (acfg, name, end_label, func);
1817 #endif
1818 }
1819
1820 void
1821 img_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1822 {
1823         if (!acfg->use_bin_writer)
1824                 asm_writer_emit_symbol_size (acfg, name, end_label);
1825 }
1826
1827 void
1828 img_writer_emit_label (MonoImageWriter *acfg, const char *name)
1829 {
1830 #ifdef USE_BIN_WRITER
1831         if (acfg->use_bin_writer)
1832                 bin_writer_emit_label (acfg, name);
1833         else
1834                 asm_writer_emit_label (acfg, name);
1835 #else
1836         asm_writer_emit_label (acfg, name);
1837 #endif
1838 }
1839
1840 void
1841 img_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1842 {
1843 #ifdef USE_BIN_WRITER
1844         if (acfg->use_bin_writer)
1845                 bin_writer_emit_bytes (acfg, buf, size);
1846         else
1847                 asm_writer_emit_bytes (acfg, buf, size);
1848 #else
1849         asm_writer_emit_bytes (acfg, buf, size);
1850 #endif
1851 }
1852
1853 void
1854 img_writer_emit_string (MonoImageWriter *acfg, const char *value)
1855 {
1856 #ifdef USE_BIN_WRITER
1857         if (acfg->use_bin_writer)
1858                 bin_writer_emit_string (acfg, value);
1859         else
1860                 asm_writer_emit_string (acfg, value);
1861 #else
1862         asm_writer_emit_string (acfg, value);
1863 #endif
1864 }
1865
1866 void
1867 img_writer_emit_line (MonoImageWriter *acfg)
1868 {
1869 #ifdef USE_BIN_WRITER
1870         if (acfg->use_bin_writer)
1871                 bin_writer_emit_line (acfg);
1872         else
1873                 asm_writer_emit_line (acfg);
1874 #else
1875                 asm_writer_emit_line (acfg);
1876 #endif
1877 }
1878
1879 void
1880 img_writer_emit_alignment (MonoImageWriter *acfg, int size)
1881 {
1882 #ifdef USE_BIN_WRITER
1883         if (acfg->use_bin_writer)
1884                 bin_writer_emit_alignment (acfg, size);
1885         else
1886                 asm_writer_emit_alignment (acfg, size);
1887 #else
1888         asm_writer_emit_alignment (acfg, size);
1889 #endif
1890 }
1891
1892 void
1893 img_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1894 {
1895 #ifdef USE_BIN_WRITER
1896         if (acfg->use_bin_writer)
1897                 bin_writer_emit_pointer_unaligned (acfg, target);
1898         else
1899                 asm_writer_emit_pointer_unaligned (acfg, target);
1900 #else
1901         asm_writer_emit_pointer_unaligned (acfg, target);
1902 #endif
1903 }
1904
1905 void
1906 img_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1907 {
1908 #ifdef USE_BIN_WRITER
1909         if (acfg->use_bin_writer)
1910                 bin_writer_emit_pointer (acfg, target);
1911         else
1912                 asm_writer_emit_pointer (acfg, target);
1913 #else
1914         asm_writer_emit_pointer (acfg, target);
1915 #endif
1916 }
1917
1918 void
1919 img_writer_emit_int16 (MonoImageWriter *acfg, int value)
1920 {
1921 #ifdef USE_BIN_WRITER
1922         if (acfg->use_bin_writer)
1923                 bin_writer_emit_int16 (acfg, value);
1924         else
1925                 asm_writer_emit_int16 (acfg, value);
1926 #else
1927         asm_writer_emit_int16 (acfg, value);
1928 #endif
1929 }
1930
1931 void
1932 img_writer_emit_int32 (MonoImageWriter *acfg, int value)
1933 {
1934 #ifdef USE_BIN_WRITER
1935         if (acfg->use_bin_writer)
1936                 bin_writer_emit_int32 (acfg, value);
1937         else
1938                 asm_writer_emit_int32 (acfg, value);
1939 #else
1940         asm_writer_emit_int32 (acfg, value);
1941 #endif
1942 }
1943
1944 void
1945 img_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1946 {
1947 #ifdef USE_BIN_WRITER
1948         if (acfg->use_bin_writer)
1949                 bin_writer_emit_symbol_diff (acfg, end, start, offset);
1950         else
1951                 asm_writer_emit_symbol_diff (acfg, end, start, offset);
1952 #else
1953         asm_writer_emit_symbol_diff (acfg, end, start, offset);
1954 #endif
1955 }
1956
1957 void
1958 img_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1959 {
1960 #ifdef USE_BIN_WRITER
1961         if (acfg->use_bin_writer)
1962                 bin_writer_emit_zero_bytes (acfg, num);
1963         else
1964                 asm_writer_emit_zero_bytes (acfg, num);
1965 #else
1966         asm_writer_emit_zero_bytes (acfg, num);
1967 #endif
1968 }
1969
1970 int
1971 img_writer_emit_writeout (MonoImageWriter *acfg)
1972 {
1973 #ifdef USE_BIN_WRITER
1974         if (acfg->use_bin_writer)
1975                 return bin_writer_emit_writeout (acfg);
1976         else
1977                 return asm_writer_emit_writeout (acfg);
1978 #else
1979                 return asm_writer_emit_writeout (acfg);
1980 #endif
1981 }
1982
1983 void
1984 img_writer_emit_byte (MonoImageWriter *acfg, guint8 val)
1985 {
1986         img_writer_emit_bytes (acfg, &val, 1);
1987 }
1988
1989 /*
1990  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
1991  * Do not advance PC.
1992  */
1993 void
1994 img_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
1995 {
1996         /* This is only supported by the bin writer */
1997 #ifdef USE_BIN_WRITER
1998         if (acfg->use_bin_writer)
1999                 bin_writer_emit_reloc (acfg, reloc_type, symbol, addend);
2000         else
2001                 g_assert_not_reached ();
2002 #else
2003                 g_assert_not_reached ();
2004 #endif
2005 }
2006
2007 /*
2008  * img_writer_emit_unset_mode:
2009  *
2010  *   Flush buffered data so it is safe to write to the output file from outside this
2011  * module. This is a nop for the binary writer.
2012  */
2013 void
2014 img_writer_emit_unset_mode (MonoImageWriter *acfg)
2015 {
2016         if (!acfg->use_bin_writer)
2017                 asm_writer_emit_unset_mode (acfg);
2018 }
2019
2020 /*
2021  * img_writer_get_output:
2022  *
2023  *   Return the output buffer of a binary writer emitting to memory. The returned memory
2024  * is from malloc, and it is owned by the caller.
2025  */
2026 guint8*
2027 img_writer_get_output (MonoImageWriter *acfg, guint32 *size)
2028 {
2029 #ifdef USE_BIN_WRITER
2030         guint8 *buf;
2031
2032         g_assert (acfg->use_bin_writer);
2033
2034         buf = acfg->out_buf;
2035         *size = acfg->out_buf_size;
2036         acfg->out_buf = NULL;
2037         return buf;
2038 #else
2039         g_assert_not_reached ();
2040         return NULL;
2041 #endif
2042 }
2043
2044 /*
2045  * Return whenever the binary writer is supported on this platform.
2046  */
2047 gboolean
2048 bin_writer_supported (void)
2049 {
2050 #ifdef USE_BIN_WRITER
2051         return TRUE;
2052 #else
2053         return FALSE;
2054 #endif
2055 }
2056
2057 /*
2058  * img_writer_create:
2059  *
2060  *   Create an image writer writing to FP. If USE_BIN_WRITER is TRUE, FP can be NULL,
2061  * in this case the image writer will write to a memory buffer obtainable by calling
2062  * img_writer_get_output ().
2063  */
2064 MonoImageWriter*
2065 img_writer_create (FILE *fp, gboolean use_bin_writer)
2066 {
2067         MonoImageWriter *w = g_new0 (MonoImageWriter, 1);
2068
2069 #ifndef USE_BIN_WRITER
2070         g_assert (!use_bin_writer);
2071 #endif
2072
2073         if (!use_bin_writer)
2074                 g_assert (fp);
2075
2076         w->fp = fp;
2077         w->use_bin_writer = use_bin_writer;
2078         w->mempool = mono_mempool_new ();
2079
2080         return w;
2081 }
2082
2083 void
2084 img_writer_destroy (MonoImageWriter *w)
2085 {
2086         // FIXME: Free all the stuff
2087         mono_mempool_destroy (w->mempool);
2088         g_free (w);
2089 }
2090
2091 gboolean
2092 img_writer_subsections_supported (MonoImageWriter *acfg)
2093 {
2094 #ifdef TARGET_ASM_APPLE
2095         return acfg->use_bin_writer;
2096 #else
2097         return TRUE;
2098 #endif
2099 }
2100
2101 FILE *
2102 img_writer_get_fp (MonoImageWriter *acfg)
2103 {
2104         return acfg->fp;
2105 }
2106
2107 const char *
2108 img_writer_get_temp_label_prefix (MonoImageWriter *acfg)
2109 {
2110         return AS_TEMP_LABEL_PREFIX;
2111 }