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_RODATA,
 474         SECT_DATA,
 475         SECT_BSS,
 476         SECT_DEBUG_FRAME,
 477         SECT_DEBUG_INFO,
 478         SECT_DEBUG_ABBREV,
 479         SECT_DEBUG_LINE,
 480         SECT_DEBUG_LOC,
 481         SECT_SHSTRTAB,
 482         SECT_SYMTAB,
 483         SECT_STRTAB,
 484         SECT_NUM
 485 };
 486
 487 #if SIZEOF_VOID_P == 4
 488
 489 typedef Elf32_Ehdr ElfHeader;
 490 typedef Elf32_Shdr ElfSectHeader;
 491 typedef Elf32_Phdr ElfProgHeader;
 492 typedef Elf32_Sym ElfSymbol;
 493 typedef Elf32_Rel ElfReloc;
 494 typedef Elf32_Rela ElfRelocA;
 495 typedef Elf32_Dyn ElfDynamic;
 496
 497 #else
 498
 499 typedef Elf64_Ehdr ElfHeader;
 500 typedef Elf64_Shdr ElfSectHeader;
 501 typedef Elf64_Phdr ElfProgHeader;
 502 typedef Elf64_Sym ElfSymbol;
 503 typedef Elf64_Rel ElfReloc;
 504 typedef Elf64_Rela ElfRelocA;
 505 typedef Elf64_Dyn ElfDynamic;
 506
 507 #endif
 508
 509 typedef struct {
 510         const char *name;
 511         int type;
 512         int esize;
 513         int flags;
 514         int align;
 515 } SectInfo;
 516
 517 static SectInfo section_info [] = {
 518         {"", 0, 0, 0, 0},
 519         {".hash", SHT_HASH, 4, 2, SIZEOF_VOID_P},
 520         {".dynsym", SHT_DYNSYM, sizeof (ElfSymbol), 2, SIZEOF_VOID_P},
 521         {".dynstr", SHT_STRTAB, 0, 2, 1},
 522         {".rel.dyn", SHT_REL, sizeof (ElfReloc), 2, SIZEOF_VOID_P},
 523         {".rela.dyn", SHT_RELA, sizeof (ElfRelocA), 2, SIZEOF_VOID_P},
 524         {".text", SHT_PROGBITS, 0, 6, 4096},
 525         {".dynamic", SHT_DYNAMIC, sizeof (ElfDynamic), 3, SIZEOF_VOID_P},
 526         {".got.plt", SHT_PROGBITS, SIZEOF_VOID_P, 3, SIZEOF_VOID_P},
 527         {".rodata", SHT_PROGBITS, 0, 6, 4096},
 528         {".data", SHT_PROGBITS, 0, 3, 8},
 529         {".bss", SHT_NOBITS, 0, 3, 8},
 530         {".debug_frame", SHT_PROGBITS, 0, 0, 8},
 531         {".debug_info", SHT_PROGBITS, 0, 0, 1},
 532         {".debug_abbrev", SHT_PROGBITS, 0, 0, 1},
 533         {".debug_line", SHT_PROGBITS, 0, 0, 1},
 534         {".debug_loc", SHT_PROGBITS, 0, 0, 1},
 535         {".shstrtab", SHT_STRTAB, 0, 0, 1},
 536         {".symtab", SHT_SYMTAB, sizeof (ElfSymbol), 0, SIZEOF_VOID_P},
 537         {".strtab", SHT_STRTAB, 0, 0, 1}
 538 };
 539
 540 typedef struct {
 541         GString *data;
 542         GHashTable *hash;
 543 } ElfStrTable;
 544
 545 static int
 546 str_table_add (ElfStrTable *table, const char* value)
 547 {
 548         int idx;
 549         if (!table->data) {
 550                 table->data = g_string_new_len ("", 1);
 551                 table->hash = g_hash_table_new (g_str_hash, g_str_equal);
 552         }
 553         idx = GPOINTER_TO_UINT (g_hash_table_lookup (table->hash, value));
 554         if (idx)
 555                 return idx;
 556         idx = table->data->len;
 557         g_string_append (table->data, value);
 558         g_string_append_c (table->data, 0);
 559         g_hash_table_insert (table->hash, (void*)value, GUINT_TO_POINTER (idx));
 560         return idx;
 561 }
 562
 563 static void
 564 append_subsection (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection *sect, BinSection *add)
 565 {
 566         int offset = sect->cur_offset;
 567         /*offset += (sheaders [sect->shidx].sh_addralign - 1);
 568         offset &= ~(sheaders [sect->shidx].sh_addralign - 1);*/
 569         /*
 570          * FIXME: we shouldn't align subsections at all, but if we don't then the
 571          * stuff inside the subsections which is aligned won't get aligned.
 572          */
 573         if (strcmp (sect->name, ".debug_line") != 0) {
 574                 offset += (8 - 1);
 575                 offset &= ~(8 - 1);
 576         }
 577         bin_writer_emit_ensure_buffer (sect, offset);
 578         //g_print ("section %s aligned to %d from %d\n", sect->name, offset, sect->cur_offset);
 579         sect->cur_offset = offset;
 580
 581         bin_writer_emit_ensure_buffer (sect, add->cur_offset);
 582         memcpy (sect->data + sect->cur_offset, add->data, add->cur_offset);
 583         add->parent = sect;
 584         sect->cur_offset += add->cur_offset;
 585         add->cur_offset = offset; /* it becomes the offset in the parent section */
 586         //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);
 587         add->data = NULL;
 588         add->data_len = 0;
 589 }
 590
 591 /* merge the subsections */
 592 static int
 593 collect_sections (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection **out, int num)
 594 {
 595         int i, j, maxs, num_sections;
 596         BinSection *sect;
 597
 598         num_sections = 0;
 599         maxs = 0;
 600         for (sect = acfg->sections; sect; sect = sect->next) {
 601                 if (sect->subsection == 0) {
 602                         out [num_sections++] = sect;
 603                         g_assert (num_sections < num);
 604                 }
 605                 maxs = MAX (maxs, sect->subsection);
 606         }
 607         for (i = 0; i < num_sections; i++) {
 608                 for (j = 1; j <= maxs; ++j) {
 609                         for (sect = acfg->sections; sect; sect = sect->next) {
 610                                 if (sect->subsection == j && strcmp (out [i]->name, sect->name) == 0) {
 611                                         append_subsection (acfg, sheaders, out [i], sect);
 612                                 }
 613                         }
 614                 }
 615         }
 616         return num_sections;
 617 }
 618
 619 static unsigned long
 620 elf_hash (const unsigned char *name)
 621 {
 622         unsigned long h = 0, g;
 623         while (*name) {
 624                 h = (h << 4) + *name++;
 625                 if ((g = h & 0xf0000000))
 626                         h ^= g >> 24;
 627                 h &= ~g;
 628         }
 629         return h;
 630 }
 631
 632 #define NUM_BUCKETS 17
 633
 634 static int*
 635 build_hash (MonoImageWriter *acfg, int num_sections, ElfStrTable *dynstr)
 636 {
 637         int *data;
 638         int num_symbols = 1 + num_sections + 3;
 639         BinSymbol *symbol;
 640
 641         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 642                 if (!symbol->is_global)
 643                         continue;
 644                 num_symbols++;
 645                 str_table_add (dynstr, symbol->name);
 646                 /*g_print ("adding sym: %s\n", symbol->name);*/
 647         }
 648         str_table_add (dynstr, "__bss_start");
 649         str_table_add (dynstr, "_edata");
 650         str_table_add (dynstr, "_end");
 651
 652         data = g_new0 (int, num_symbols + 2 + NUM_BUCKETS);
 653         data [0] = NUM_BUCKETS;
 654         data [1] = num_symbols;
 655
 656         return data;
 657 }
 658
 659 static gsize
 660 get_label_addr (MonoImageWriter *acfg, const char *name)
 661 {
 662         int offset;
 663         BinLabel *lab;
 664         BinSection *section;
 665         gsize value;
 666
 667         lab = g_hash_table_lookup (acfg->labels, name);
 668         if (!lab)
 669                 g_error ("Undefined label: '%s'.\n", name);
 670         section = lab->section;
 671         offset = lab->offset;
 672         if (section->parent) {
 673                 value = section->parent->virt_offset + section->cur_offset + offset;
 674         } else {
 675                 value = section->virt_offset + offset;
 676         }
 677         return value;
 678 }
 679
 680 static ElfSymbol*
 681 collect_syms (MonoImageWriter *acfg, int *hash, ElfStrTable *strtab, ElfSectHeader *sheaders, int *num_syms)
 682 {
 683         ElfSymbol *symbols;
 684         BinSymbol *symbol;
 685         BinSection *section;
 686         int i;
 687         int *bucket;
 688         int *chain;
 689         unsigned long hashc;
 690
 691         if (hash)
 692                 symbols = g_new0 (ElfSymbol, hash [1]);
 693         else {
 694                 i = 0;
 695                 for (symbol = acfg->symbols; symbol; symbol = symbol->next)
 696                         i ++;
 697
 698                 symbols = g_new0 (ElfSymbol, i + SECT_NUM + 10); /* FIXME */
 699         }
 700
 701         /* the first symbol is undef, all zeroes */
 702         i = 1;
 703         if (sheaders) {
 704                 int j;
 705                 for (j = 1; j < SECT_NUM; ++j) {
 706                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 707                         symbols [i].st_shndx = j;
 708                         symbols [i].st_value = sheaders [j].sh_addr;
 709                         ++i;
 710                 }
 711         } else {
 712                 for (section = acfg->sections; section; section = section->next) {
 713                         if (section->parent)
 714                                 continue;
 715                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 716                         if (strcmp (section->name, ".text") == 0) {
 717                                 symbols [i].st_shndx = SECT_TEXT;
 718                                 section->shidx = SECT_TEXT;
 719                                 section->file_offset = 4096;
 720                                 symbols [i].st_value = section->virt_offset;
 721                         } else if (strcmp (section->name, ".rodata") == 0) {
 722                                 symbols [i].st_shndx = SECT_RODATA;
 723                                 section->shidx = SECT_RODATA;
 724                                 section->file_offset = 4096;
 725                                 symbols [i].st_value = section->virt_offset;
 726                         } else if (strcmp (section->name, ".data") == 0) {
 727                                 symbols [i].st_shndx = SECT_DATA;
 728                                 section->shidx = SECT_DATA;
 729                                 section->file_offset = 4096 + 28; /* FIXME */
 730                                 symbols [i].st_value = section->virt_offset;
 731                         } else if (strcmp (section->name, ".bss") == 0) {
 732                                 symbols [i].st_shndx = SECT_BSS;
 733                                 section->shidx = SECT_BSS;
 734                                 section->file_offset = 4096 + 28 + 8; /* FIXME */
 735                                 symbols [i].st_value = section->virt_offset;
 736                         }
 737                         ++i;
 738                 }
 739         }
 740         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 741                 int offset;
 742                 BinLabel *lab;
 743                 if (!symbol->is_global && hash)
 744                         continue;
 745                 symbols [i].st_info = ELF32_ST_INFO (symbol->is_global ? STB_GLOBAL : STB_LOCAL, symbol->is_function? STT_FUNC : STT_OBJECT);
 746                 symbols [i].st_name = str_table_add (strtab, symbol->name);
 747                 /*g_print ("sym name %s tabled to %d\n", symbol->name, symbols [i].st_name);*/
 748                 section = symbol->section;
 749                 symbols [i].st_shndx = section->parent? section->parent->shidx: section->shidx;
 750                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 751                 offset = lab->offset;
 752                 if (section->parent) {
 753                         symbols [i].st_value = section->parent->virt_offset + section->cur_offset + offset;
 754                 } else {
 755                         symbols [i].st_value = section->virt_offset + offset;
 756                 }
 757
 758                 if (symbol->end_label) {
 759                         BinLabel *elab = g_hash_table_lookup (acfg->labels, symbol->end_label);
 760                         g_assert (elab);
 761                         symbols [i].st_size = elab->offset - lab->offset;
 762                 }
 763                 ++i;
 764         }
 765         /* add special symbols */
 766         symbols [i].st_name = str_table_add (strtab, "__bss_start");
 767         symbols [i].st_shndx = 0xfff1;
 768         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 769         ++i;
 770         symbols [i].st_name = str_table_add (strtab, "_edata");
 771         symbols [i].st_shndx = 0xfff1;
 772         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 773         ++i;
 774         symbols [i].st_name = str_table_add (strtab, "_end");
 775         symbols [i].st_shndx = 0xfff1;
 776         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 777         ++i;
 778
 779         if (num_syms)
 780                 *num_syms = i;
 781
 782         /* add to hash table */
 783         if (hash) {
 784                 bucket = hash + 2;
 785                 chain = hash + 2 + hash [0];
 786                 for (i = 0; i < hash [1]; ++i) {
 787                         int slot;
 788                         /*g_print ("checking %d '%s' (sym %d)\n", symbols [i].st_name, strtab->data->str + symbols [i].st_name, i);*/
 789                         if (!symbols [i].st_name)
 790                                 continue;
 791                         hashc = elf_hash ((guint8*)strtab->data->str + symbols [i].st_name);
 792                         slot = hashc % hash [0];
 793                         /*g_print ("hashing '%s' at slot %d (sym %d)\n", strtab->data->str + symbols [i].st_name, slot, i);*/
 794                         if (bucket [slot]) {
 795                                 chain [i] = bucket [slot];
 796                                 bucket [slot] = i;
 797                         } else {
 798                                 bucket [slot] = i;
 799                         }
 800                 }
 801         }
 802         return symbols;
 803 }
 804
 805 static void
 806 reloc_symbols (MonoImageWriter *acfg, ElfSymbol *symbols, ElfSectHeader *sheaders, ElfStrTable *strtab, gboolean dynamic)
 807 {
 808         BinSection *section;
 809         BinSymbol *symbol;
 810         int i;
 811
 812         i = 1;
 813         if (dynamic) {
 814                 for (section = acfg->sections; section; section = section->next) {
 815                         if (section->parent)
 816                                 continue;
 817                         symbols [i].st_value = sheaders [section->shidx].sh_addr;
 818                         ++i;
 819                 }
 820         } else {
 821                 for (i = 1; i < SECT_NUM; ++i) {
 822                         symbols [i].st_value = sheaders [i].sh_addr;
 823                 }
 824         }
 825         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 826                 int offset;
 827                 BinLabel *lab;
 828                 if (dynamic && !symbol->is_global)
 829                         continue;
 830                 section = symbol->section;
 831                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 832                 offset = lab->offset;
 833                 if (section->parent) {
 834                         symbols [i].st_value = sheaders [section->parent->shidx].sh_addr + section->cur_offset + offset;
 835                 } else {
 836                         symbols [i].st_value = sheaders [section->shidx].sh_addr + offset;
 837                 }
 838                 ++i;
 839         }
 840         /* __bss_start */
 841         symbols [i].st_value = sheaders [SECT_BSS].sh_addr;
 842         ++i;
 843         /* _edata */
 844         symbols [i].st_value = sheaders [SECT_DATA].sh_addr + sheaders [SECT_DATA].sh_size;
 845         ++i;
 846         /* _end */
 847         symbols [i].st_value = sheaders [SECT_BSS].sh_addr + sheaders [SECT_BSS].sh_size;
 848         ++i;
 849 }
 850
 851 static void
 852 resolve_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 **out_data, gsize *out_vaddr, gsize *out_start_val, gsize *out_end_val)
 853 {
 854         guint8 *data;
 855         gssize end_val, start_val;
 856         gsize vaddr;
 857
 858         end_val = get_label_addr (acfg, reloc->val1);
 859         if (reloc->val2) {
 860                 start_val = get_label_addr (acfg, reloc->val2);
 861         } else if (reloc->val2_section) {
 862                 start_val = reloc->val2_offset;
 863                 if (reloc->val2_section->parent)
 864                         start_val += reloc->val2_section->parent->virt_offset + reloc->val2_section->cur_offset;
 865                 else
 866                         start_val += reloc->val2_section->virt_offset;
 867         } else {
 868                 start_val = 0;
 869         }
 870         end_val = end_val - start_val + reloc->offset;
 871         if (reloc->section->parent) {
 872                 data = reloc->section->parent->data;
 873                 data += reloc->section->cur_offset;
 874                 data += reloc->section_offset;
 875                 vaddr = reloc->section->parent->virt_offset;
 876                 vaddr += reloc->section->cur_offset;
 877                 vaddr += reloc->section_offset;
 878         } else {
 879                 data = reloc->section->data;
 880                 data += reloc->section_offset;
 881                 vaddr = reloc->section->virt_offset;
 882                 vaddr += reloc->section_offset;
 883         }
 884
 885         *out_start_val = start_val;
 886         *out_end_val = end_val;
 887         *out_data = data;
 888         *out_vaddr = vaddr;
 889 }
 890
 891 #ifdef USE_ELF_RELA
 892
 893 static ElfRelocA*
 894 resolve_relocations (MonoImageWriter *acfg)
 895 {
 896         BinReloc *reloc;
 897         guint8 *data;
 898         gsize end_val, start_val;
 899         ElfRelocA *rr;
 900         int i;
 901         gsize vaddr;
 902
 903         rr = g_new0 (ElfRelocA, acfg->num_relocs);
 904         i = 0;
 905
 906         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 907                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 908                 /* FIXME: little endian */
 909                 data [0] = end_val;
 910                 data [1] = end_val >> 8;
 911                 data [2] = end_val >> 16;
 912                 data [3] = end_val >> 24;
 913                 // FIXME:
 914                 if (start_val == 0 && reloc->val1 [0] != '.') {
 915                         rr [i].r_offset = vaddr;
 916                         rr [i].r_info = R_X86_64_RELATIVE;
 917                         rr [i].r_addend = end_val;
 918                         ++i;
 919                         g_assert (i <= acfg->num_relocs);
 920                 }
 921         }
 922         return rr;
 923 }
 924
 925 #else /* USE_ELF_RELA */
 926
 927 static void
 928 do_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 *data, gssize addr)
 929 {
 930 #ifdef TARGET_ARM
 931         /*
 932          * We use the official ARM relocation types, but implement only the stuff actually
 933          * needed by the code we generate.
 934          */
 935         switch (reloc->reloc_type) {
 936         case R_ARM_CALL:
 937         case R_ARM_JUMP24: {
 938                 guint32 *code = (guint32*)(gpointer)data;
 939                 guint32 ins = *code;
 940                 int diff = addr;
 941
 942                 if (reloc->reloc_type == R_ARM_CALL)
 943                         /* bl */
 944                         g_assert (data [3] == 0xeb);
 945                 else
 946                         /* b */
 947                         g_assert (data [3] == 0xea);
 948                 if (diff >= 0 && diff <= 33554431) {
 949                         diff >>= 2;
 950                         ins = (ins & 0xff000000) | diff;
 951                         *code = ins;
 952                 } else if (diff <= 0 && diff >= -33554432) {
 953                         diff >>= 2;
 954                         ins = (ins & 0xff000000) | (diff & ~0xff000000);
 955                         *code = ins;
 956                 } else {
 957                         g_assert_not_reached ();
 958                 }
 959                 break;
 960         }
 961         case R_ARM_ALU_PC_G0_NC: {
 962                 /* Generated by emit_plt () */
 963                 guint8 *code = data;
 964                 guint32 val = addr;
 965
 966                 g_assert (val <= 0xffffff);
 967                 if (val & 0xff0000)
 968                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, (val & 0xFF0000) >> 16, 16);
 969                 else
 970                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, 0, 0);
 971                 ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_IP, (val & 0xFF00) >> 8, 24);
 972                 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, val & 0xFF);
 973                 break;
 974         }
 975         default:
 976                 g_assert_not_reached ();
 977         }
 978 #else
 979         g_assert_not_reached ();
 980 #endif
 981 }
 982
 983 static ElfReloc*
 984 resolve_relocations (MonoImageWriter *acfg)
 985 {
 986         BinReloc *reloc;
 987         guint8 *data;
 988         gsize end_val, start_val;
 989         ElfReloc *rr;
 990         int i;
 991         gsize vaddr;
 992
 993         rr = g_new0 (ElfReloc, acfg->num_relocs);
 994         i = 0;
 995
 996         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 997                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 998                 /* FIXME: little endian */
 999                 if (reloc->reloc_type) {
1000                         /* Must be static */
1001                         g_assert (start_val > 0);
1002                         do_reloc (acfg, reloc, data, end_val);
1003                 } else {
1004                         data [0] = end_val;
1005                         data [1] = end_val >> 8;
1006                         data [2] = end_val >> 16;
1007                         data [3] = end_val >> 24;
1008                 }
1009                 // FIXME:
1010                 if (start_val == 0 && reloc->val1 [0] != '.') {
1011                         rr [i].r_offset = vaddr;
1012                         rr [i].r_info = R_386_RELATIVE;
1013                         ++i;
1014                         g_assert (i <= acfg->num_relocs);
1015                 }
1016         }
1017         return rr;
1018 }
1019
1020 #endif /* USE_ELF_RELA */
1021
1022 static void
1023 bin_writer_fwrite (MonoImageWriter *acfg, void *val, size_t size, size_t nmemb)
1024 {
1025         if (acfg->fp)
1026                 fwrite (val, size, nmemb, acfg->fp);
1027         else {
1028                 g_assert (acfg->out_buf_pos + (size * nmemb) <= acfg->out_buf_size);
1029                 memcpy (acfg->out_buf + acfg->out_buf_pos, val, size * nmemb);
1030                 acfg->out_buf_pos += (size * nmemb);
1031         }
1032 }
1033
1034 static void
1035 bin_writer_fseek (MonoImageWriter *acfg, int offset)
1036 {
1037         if (acfg->fp)
1038                 fseek (acfg->fp, offset, SEEK_SET);
1039         else
1040                 acfg->out_buf_pos = offset;
1041 }
1042
1043 static int normal_sections [] = { SECT_RODATA, SECT_DATA, SECT_DEBUG_FRAME, SECT_DEBUG_INFO, SECT_DEBUG_ABBREV, SECT_DEBUG_LINE, SECT_DEBUG_LOC };
1044
1045 static int
1046 bin_writer_emit_writeout (MonoImageWriter *acfg)
1047 {
1048         FILE *file;
1049         ElfHeader header;
1050         ElfProgHeader progh [3];
1051         ElfSectHeader secth [SECT_NUM];
1052 #ifdef USE_ELF_RELA
1053         ElfRelocA *relocs;
1054 #else
1055         ElfReloc *relocs;
1056 #endif
1057         ElfStrTable str_table = {NULL, NULL};
1058         ElfStrTable sh_str_table = {NULL, NULL};
1059         ElfStrTable dyn_str_table = {NULL, NULL};
1060         BinSection* all_sections [32];
1061         BinSection* sections [SECT_NUM];
1062         ElfSymbol *dynsym;
1063         ElfSymbol *symtab;
1064         ElfDynamic dynamic [14];
1065         int *hash;
1066         int i, num_sections, file_offset, virt_offset, size, num_symtab;
1067         int num_local_syms;
1068
1069         file = acfg->fp;
1070
1071         /* Section headers */
1072         memset (&secth, 0, sizeof (secth));
1073         memset (&dynamic, 0, sizeof (dynamic));
1074         memset (&header, 0, sizeof (header));
1075
1076         for (i = 1; i < SECT_NUM; ++i) {
1077                 secth [i].sh_name = str_table_add (&sh_str_table, section_info [i].name);
1078                 secth [i].sh_type = section_info [i].type;
1079                 secth [i].sh_addralign = section_info [i].align;
1080                 secth [i].sh_flags = section_info [i].flags;
1081                 secth [i].sh_entsize = section_info [i].esize;
1082         }
1083         secth [SECT_DYNSYM].sh_info = SIZEOF_VOID_P == 4 ? 4 : 2;
1084         secth [SECT_SYMTAB].sh_info = SIZEOF_VOID_P == 4 ? 20 : 17;
1085         secth [SECT_HASH].sh_link = SECT_DYNSYM;
1086         secth [SECT_DYNSYM].sh_link = SECT_DYNSTR;
1087         secth [SECT_REL_DYN].sh_link = SECT_DYNSYM;
1088         secth [SECT_RELA_DYN].sh_link = SECT_DYNSYM;
1089         secth [SECT_DYNAMIC].sh_link = SECT_DYNSTR;
1090         secth [SECT_SYMTAB].sh_link = SECT_STRTAB;
1091
1092         num_sections = collect_sections (acfg, secth, all_sections, 16);
1093         hash = build_hash (acfg, num_sections, &dyn_str_table);
1094         num_symtab = hash [1]; /* FIXME */
1095 #if 0
1096         g_print ("num_sections: %d\n", num_sections);
1097         g_print ("dynsym: %d, dynstr size: %d\n", hash [1], (int)dyn_str_table.data->len);
1098         for (i = 0; i < num_sections; ++i) {
1099                 g_print ("section %s, size: %d, %x\n", all_sections [i]->name, all_sections [i]->cur_offset, all_sections [i]->cur_offset);
1100         }
1101 #endif
1102         /* Associate the bin sections with the ELF sections */
1103         memset (sections, 0, sizeof (sections));
1104         for (i = 0; i < num_sections; ++i) {
1105                 BinSection *sect = all_sections [i];
1106                 int j;
1107
1108                 for (j = 0; j < SECT_NUM; ++j) {
1109                         if (strcmp (sect->name, section_info [j].name) == 0) {
1110                                 sect->shidx = j;
1111                                 break;
1112                         }
1113                 }
1114
1115                 sections [all_sections [i]->shidx] = sect;
1116         }
1117
1118         /* at this point we know where in the file the first segment sections go */
1119         dynsym = collect_syms (acfg, hash, &dyn_str_table, NULL, NULL);
1120         num_local_syms = hash [1];
1121         symtab = collect_syms (acfg, NULL, &str_table, secth, &num_local_syms);
1122
1123         file_offset = virt_offset = sizeof (header) + sizeof (progh);
1124         secth [SECT_HASH].sh_addr = secth [SECT_HASH].sh_offset = file_offset;
1125         size = sizeof (int) * (2 + hash [0] + hash [1]);
1126         virt_offset = (file_offset += size);
1127         secth [SECT_HASH].sh_size = size;
1128         secth [SECT_DYNSYM].sh_addr = secth [SECT_DYNSYM].sh_offset = file_offset;
1129         size = sizeof (ElfSymbol) * hash [1];
1130         virt_offset = (file_offset += size);
1131         secth [SECT_DYNSYM].sh_size = size;
1132         secth [SECT_DYNSTR].sh_addr = secth [SECT_DYNSTR].sh_offset = file_offset;
1133         size = dyn_str_table.data->len;
1134         virt_offset = (file_offset += size);
1135         secth [SECT_DYNSTR].sh_size = size;
1136         file_offset += 4-1;
1137         file_offset &= ~(4-1);
1138         secth [SECT_REL_DYN].sh_addr = secth [SECT_REL_DYN].sh_offset = file_offset;
1139 #ifndef USE_ELF_RELA
1140         size = sizeof (ElfReloc) * acfg->num_relocs;
1141 #else
1142         size = 0;
1143 #endif
1144         virt_offset = (file_offset += size);
1145         secth [SECT_REL_DYN].sh_size = size;
1146         secth [SECT_RELA_DYN].sh_addr = secth [SECT_RELA_DYN].sh_offset = file_offset;
1147 #ifdef USE_ELF_RELA
1148         size = sizeof (ElfRelocA) * acfg->num_relocs;
1149 #else
1150         size = 0;
1151 #endif
1152         virt_offset = (file_offset += size);
1153         secth [SECT_RELA_DYN].sh_size = size;
1154
1155         file_offset = ALIGN_TO (file_offset, secth [SECT_TEXT].sh_addralign);
1156         virt_offset = file_offset;
1157         secth [SECT_TEXT].sh_addr = secth [SECT_TEXT].sh_offset = file_offset;
1158         if (sections [SECT_TEXT]) {
1159                 if (sections [SECT_TEXT]->has_addr) {
1160                         secth [SECT_TEXT].sh_addr = sections [SECT_TEXT]->addr;
1161                         secth [SECT_TEXT].sh_flags &= ~SHF_ALLOC;
1162                 }
1163                 size = sections [SECT_TEXT]->cur_offset;
1164                 secth [SECT_TEXT].sh_size = size;
1165                 file_offset += size;
1166         }
1167
1168         file_offset = ALIGN_TO (file_offset, secth [SECT_DYNAMIC].sh_addralign);
1169         virt_offset = file_offset;
1170
1171         /* .dynamic, .got.plt, .data, .bss here */
1172         /* Have to increase the virt offset since these go to a separate segment */
1173         virt_offset += PAGESIZE;
1174         secth [SECT_DYNAMIC].sh_addr = virt_offset;
1175         secth [SECT_DYNAMIC].sh_offset = file_offset;
1176         size = sizeof (dynamic);
1177         secth [SECT_DYNAMIC].sh_size = size;
1178         file_offset += size;
1179         virt_offset += size;
1180
1181         file_offset = ALIGN_TO (file_offset, secth [SECT_GOT_PLT].sh_addralign);
1182         virt_offset = ALIGN_TO (virt_offset, secth [SECT_GOT_PLT].sh_addralign);
1183         secth [SECT_GOT_PLT].sh_addr = virt_offset;
1184         secth [SECT_GOT_PLT].sh_offset = file_offset;
1185         size = 3 * SIZEOF_VOID_P;
1186         secth [SECT_GOT_PLT].sh_size = size;
1187         file_offset += size;
1188         virt_offset += size;
1189
1190         file_offset = ALIGN_TO (file_offset, secth [SECT_RODATA].sh_addralign);
1191         virt_offset = ALIGN_TO (virt_offset, secth [SECT_RODATA].sh_addralign);
1192         secth [SECT_RODATA].sh_addr = virt_offset;
1193         secth [SECT_RODATA].sh_offset = file_offset;
1194         if (sections [SECT_RODATA]) {
1195                 size = sections [SECT_RODATA]->cur_offset;
1196                 secth [SECT_RODATA].sh_size = size;
1197                 file_offset += size;
1198                 virt_offset += size;
1199         }
1200
1201         file_offset = ALIGN_TO (file_offset, secth [SECT_DATA].sh_addralign);
1202         virt_offset = ALIGN_TO (virt_offset, secth [SECT_DATA].sh_addralign);
1203         secth [SECT_DATA].sh_addr = virt_offset;
1204         secth [SECT_DATA].sh_offset = file_offset;
1205         if (sections [SECT_DATA]) {
1206                 size = sections [SECT_DATA]->cur_offset;
1207                 secth [SECT_DATA].sh_size = size;
1208                 file_offset += size;
1209                 virt_offset += size;
1210         }
1211
1212         file_offset = ALIGN_TO (file_offset, secth [SECT_BSS].sh_addralign);
1213         virt_offset = ALIGN_TO (virt_offset, secth [SECT_BSS].sh_addralign);
1214         secth [SECT_BSS].sh_addr = virt_offset;
1215         secth [SECT_BSS].sh_offset = file_offset;
1216         if (sections [SECT_BSS]) {
1217                 size = sections [SECT_BSS]->cur_offset;
1218                 secth [SECT_BSS].sh_size = size;
1219         }
1220
1221         /* virtual doesn't matter anymore */
1222         file_offset = ALIGN_TO (file_offset, secth [SECT_DEBUG_FRAME].sh_addralign);
1223         secth [SECT_DEBUG_FRAME].sh_offset = file_offset;
1224         if (sections [SECT_DEBUG_FRAME])
1225                 size = sections [SECT_DEBUG_FRAME]->cur_offset;
1226         else
1227                 size = 0;
1228         secth [SECT_DEBUG_FRAME].sh_size = size;
1229         file_offset += size;
1230
1231         secth [SECT_DEBUG_INFO].sh_offset = file_offset;
1232         if (sections [SECT_DEBUG_INFO])
1233                 size = sections [SECT_DEBUG_INFO]->cur_offset;
1234         else
1235                 size = 0;
1236         secth [SECT_DEBUG_INFO].sh_size = size;
1237         file_offset += size;
1238
1239         secth [SECT_DEBUG_ABBREV].sh_offset = file_offset;
1240         if (sections [SECT_DEBUG_ABBREV])
1241                 size = sections [SECT_DEBUG_ABBREV]->cur_offset;
1242         else
1243                 size = 0;
1244         secth [SECT_DEBUG_ABBREV].sh_size = size;
1245         file_offset += size;
1246
1247         secth [SECT_DEBUG_LINE].sh_offset = file_offset;
1248         if (sections [SECT_DEBUG_LINE])
1249                 size = sections [SECT_DEBUG_LINE]->cur_offset;
1250         else
1251                 size = 0;
1252         secth [SECT_DEBUG_LINE].sh_size = size;
1253         file_offset += size;
1254
1255         secth [SECT_DEBUG_LOC].sh_offset = file_offset;
1256         if (sections [SECT_DEBUG_LOC])
1257                 size = sections [SECT_DEBUG_LOC]->cur_offset;
1258         else
1259                 size = 0;
1260         secth [SECT_DEBUG_LOC].sh_size = size;
1261         file_offset += size;
1262
1263         file_offset = ALIGN_TO (file_offset, secth [SECT_SHSTRTAB].sh_addralign);
1264         secth [SECT_SHSTRTAB].sh_offset = file_offset;
1265         size = sh_str_table.data->len;
1266         secth [SECT_SHSTRTAB].sh_size = size;
1267         file_offset += size;
1268
1269         file_offset = ALIGN_TO (file_offset, secth [SECT_SYMTAB].sh_addralign);
1270         secth [SECT_SYMTAB].sh_offset = file_offset;
1271         size = sizeof (ElfSymbol) * num_local_syms;
1272         secth [SECT_SYMTAB].sh_size = size;
1273         file_offset += size;
1274
1275         file_offset = ALIGN_TO (file_offset, secth [SECT_STRTAB].sh_addralign);
1276         secth [SECT_STRTAB].sh_offset = file_offset;
1277         size = str_table.data->len;
1278         secth [SECT_STRTAB].sh_size = size;
1279         file_offset += size;
1280
1281         for (i = 1; i < SECT_NUM; ++i) {
1282                 if (section_info [i].esize != 0)
1283                         g_assert (secth [i].sh_size % section_info [i].esize == 0);
1284         }
1285
1286         file_offset += 4-1;
1287         file_offset &= ~(4-1);
1288
1289         header.e_ident [EI_MAG0] = ELFMAG0;
1290         header.e_ident [EI_MAG1] = ELFMAG1;
1291         header.e_ident [EI_MAG2] = ELFMAG2;
1292         header.e_ident [EI_MAG3] = ELFMAG3;
1293         header.e_ident [EI_CLASS] = SIZEOF_VOID_P == 4 ? ELFCLASS32 : ELFCLASS64;
1294         header.e_ident [EI_DATA] = ELFDATA2LSB;
1295         header.e_ident [EI_VERSION] = EV_CURRENT;
1296         header.e_ident [EI_OSABI] = ELFOSABI_NONE;
1297         header.e_ident [EI_ABIVERSION] = 0;
1298         for (i = EI_PAD; i < EI_NIDENT; ++i)
1299                 header.e_ident [i] = 0;
1300
1301         header.e_type = ET_DYN;
1302 #if defined(TARGET_X86)
1303         header.e_machine = EM_386;
1304 #elif defined(TARGET_AMD64)
1305         header.e_machine = EM_X86_64;
1306 #elif defined(TARGET_ARM)
1307         header.e_machine = EM_ARM;
1308 #else
1309         g_assert_not_reached ();
1310 #endif
1311         header.e_version = 1;
1312
1313         header.e_phoff = sizeof (header);
1314         header.e_ehsize = sizeof (header);
1315         header.e_phentsize = sizeof (ElfProgHeader);
1316         header.e_phnum = 3;
1317         header.e_entry = secth [SECT_TEXT].sh_addr;
1318         header.e_shstrndx = SECT_SHSTRTAB;
1319         header.e_shentsize = sizeof (ElfSectHeader);
1320         header.e_shnum = SECT_NUM;
1321         header.e_shoff = file_offset;
1322
1323         /* dynamic data */
1324         i = 0;
1325         dynamic [i].d_tag = DT_HASH;
1326         dynamic [i].d_un.d_val = secth [SECT_HASH].sh_offset;
1327         ++i;
1328         dynamic [i].d_tag = DT_STRTAB;
1329         dynamic [i].d_un.d_val = secth [SECT_DYNSTR].sh_offset;
1330         ++i;
1331         dynamic [i].d_tag = DT_SYMTAB;
1332         dynamic [i].d_un.d_val = secth [SECT_DYNSYM].sh_offset;
1333         ++i;
1334         dynamic [i].d_tag = DT_STRSZ;
1335         dynamic [i].d_un.d_val = dyn_str_table.data->len;
1336         ++i;
1337         dynamic [i].d_tag = DT_SYMENT;
1338         dynamic [i].d_un.d_val = sizeof (ElfSymbol);
1339         ++i;
1340 #ifdef USE_ELF_RELA
1341         dynamic [i].d_tag = DT_RELA;
1342         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_offset;
1343         ++i;
1344         dynamic [i].d_tag = DT_RELASZ;
1345         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_size;
1346         ++i;
1347         dynamic [i].d_tag = DT_RELAENT;
1348         dynamic [i].d_un.d_val = sizeof (ElfRelocA);
1349         ++i;
1350 #else
1351         dynamic [i].d_tag = DT_REL;
1352         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_offset;
1353         ++i;
1354         dynamic [i].d_tag = DT_RELSZ;
1355         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_size;
1356         ++i;
1357         dynamic [i].d_tag = DT_RELENT;
1358         dynamic [i].d_un.d_val = sizeof (ElfReloc);
1359         ++i;
1360 #endif
1361         dynamic [i].d_tag = DT_RELCOUNT;
1362         dynamic [i].d_un.d_val = acfg->num_relocs;
1363         ++i;
1364
1365         /* Program header */
1366         memset (&progh, 0, sizeof (progh));
1367         progh [0].p_type = PT_LOAD;
1368         progh [0].p_filesz = progh [0].p_memsz = secth [SECT_DYNAMIC].sh_offset;
1369         progh [0].p_align = 4096;
1370         progh [0].p_flags = 5;
1371
1372         progh [1].p_type = PT_LOAD;
1373         progh [1].p_offset = secth [SECT_DYNAMIC].sh_offset;
1374         progh [1].p_vaddr = progh [1].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1375         progh [1].p_filesz = secth [SECT_BSS].sh_offset  - secth [SECT_DYNAMIC].sh_offset;
1376         progh [1].p_memsz = secth [SECT_BSS].sh_addr + secth [SECT_BSS].sh_size - secth [SECT_DYNAMIC].sh_addr;
1377         progh [1].p_align = 4096;
1378         progh [1].p_flags = 6;
1379
1380         progh [2].p_type = PT_DYNAMIC;
1381         progh [2].p_offset = secth [SECT_DYNAMIC].sh_offset;
1382         progh [2].p_vaddr = progh [2].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1383         progh [2].p_filesz = progh [2].p_memsz = secth [SECT_DYNAMIC].sh_size;
1384         progh [2].p_align = SIZEOF_VOID_P;
1385         progh [2].p_flags = 6;
1386
1387         /* Compute the addresses of the bin sections, so relocation can be done */
1388         for (i = 0; i < SECT_NUM; ++i) {
1389                 if (sections [i]) {
1390                         sections [i]->file_offset = secth [i].sh_offset;
1391                         sections [i]->virt_offset = secth [i].sh_addr;
1392                 }
1393         }
1394
1395         reloc_symbols (acfg, dynsym, secth, &dyn_str_table, TRUE);
1396         reloc_symbols (acfg, symtab, secth, &str_table, FALSE);
1397         relocs = resolve_relocations (acfg);
1398
1399         if (!acfg->fp) {
1400                 acfg->out_buf_size = file_offset + sizeof (secth);
1401                 acfg->out_buf = g_malloc (acfg->out_buf_size);
1402         }
1403
1404         bin_writer_fwrite (acfg, &header, sizeof (header), 1);
1405         bin_writer_fwrite (acfg, &progh, sizeof (progh), 1);
1406         bin_writer_fwrite (acfg, hash, sizeof (int) * (hash [0] + hash [1] + 2), 1);
1407         bin_writer_fwrite (acfg, dynsym, sizeof (ElfSymbol) * hash [1], 1);
1408         bin_writer_fwrite (acfg, dyn_str_table.data->str, dyn_str_table.data->len, 1);
1409         /* .rel.dyn */
1410         bin_writer_fseek (acfg, secth [SECT_REL_DYN].sh_offset);
1411         bin_writer_fwrite (acfg, relocs, sizeof (ElfReloc), acfg->num_relocs);
1412
1413         /* .rela.dyn */
1414         bin_writer_fseek (acfg, secth [SECT_RELA_DYN].sh_offset);
1415         bin_writer_fwrite (acfg, relocs, secth [SECT_RELA_DYN].sh_size, 1);
1416
1417         /* .text */
1418         if (sections [SECT_TEXT]) {
1419                 bin_writer_fseek (acfg, secth [SECT_TEXT].sh_offset);
1420                 bin_writer_fwrite (acfg, sections [SECT_TEXT]->data, sections [SECT_TEXT]->cur_offset, 1);
1421         }
1422         /* .dynamic */
1423         bin_writer_fwrite (acfg, dynamic, sizeof (dynamic), 1);
1424
1425         /* .got.plt */
1426         size = secth [SECT_DYNAMIC].sh_addr;
1427         bin_writer_fwrite (acfg, &size, sizeof (size), 1);
1428
1429         /* normal sections */
1430         for (i = 0; i < sizeof (normal_sections) / sizeof (normal_sections [0]); ++i) {
1431                 int sect = normal_sections [i];
1432                 if (sections [sect]) {
1433                         bin_writer_fseek (acfg, secth [sect].sh_offset);
1434                         bin_writer_fwrite (acfg, sections [sect]->data, sections [sect]->cur_offset, 1);
1435                 }
1436         }
1437
1438         bin_writer_fseek (acfg, secth [SECT_SHSTRTAB].sh_offset);
1439         bin_writer_fwrite (acfg, sh_str_table.data->str, sh_str_table.data->len, 1);
1440         bin_writer_fseek (acfg, secth [SECT_SYMTAB].sh_offset);
1441         bin_writer_fwrite (acfg, symtab, sizeof (ElfSymbol) * num_local_syms, 1);
1442         bin_writer_fseek (acfg, secth [SECT_STRTAB].sh_offset);
1443         bin_writer_fwrite (acfg, str_table.data->str, str_table.data->len, 1);
1444         /*g_print ("file_offset %d vs %d\n", file_offset, ftell (file));*/
1445         /*g_assert (file_offset >= ftell (file));*/
1446         bin_writer_fseek (acfg, file_offset);
1447         bin_writer_fwrite (acfg, &secth, sizeof (secth), 1);
1448
1449         if (acfg->fp)
1450                 fclose (acfg->fp);
1451
1452         return 0;
1453 }
1454
1455 #endif /* USE_ELF_WRITER */
1456
1457 #endif /* USE_BIN_WRITER */
1458
1459 /* ASM WRITER */
1460
1461 static void
1462 asm_writer_emit_start (MonoImageWriter *acfg)
1463 {
1464 }
1465
1466 static int
1467 asm_writer_emit_writeout (MonoImageWriter *acfg)
1468 {
1469         fclose (acfg->fp);
1470
1471         return 0;
1472 }
1473
1474 static void
1475 asm_writer_emit_unset_mode (MonoImageWriter *acfg)
1476 {
1477         if (acfg->mode == EMIT_NONE)
1478                 return;
1479         fprintf (acfg->fp, "\n");
1480         acfg->mode = EMIT_NONE;
1481 }
1482
1483 static void
1484 asm_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1485 {
1486         asm_writer_emit_unset_mode (acfg);
1487 #if defined(TARGET_ASM_APPLE)
1488         if (strcmp(section_name, ".bss") == 0)
1489                 fprintf (acfg->fp, "%s\n", ".data");
1490         else if (strstr (section_name, ".debug") == section_name) {
1491                 //g_assert (subsection_index == 0);
1492                 fprintf (acfg->fp, ".section __DWARF, __%s,regular,debug\n", section_name + 1);
1493         } else
1494                 fprintf (acfg->fp, "%s\n", section_name);
1495 #elif defined(TARGET_ARM) || defined(TARGET_POWERPC)
1496         /* ARM gas doesn't seem to like subsections of .bss */
1497         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data")) {
1498                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1499         } else {
1500                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1501                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1502         }
1503 #elif defined(HOST_WIN32)
1504         fprintf (acfg->fp, ".section %s\n", section_name);
1505 #else
1506         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data") || !strcmp (section_name, ".bss")) {
1507                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1508         } else {
1509                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1510                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1511         }
1512 #endif
1513 }
1514
1515 static inline
1516 const char *get_label (const char *s)
1517 {
1518 #ifdef TARGET_ASM_APPLE
1519         if (s [0] == '.' && s [1] == 'L')
1520                 /* apple uses "L" instead of ".L" to mark temporary labels */
1521                 s ++;
1522 #endif
1523         return s;
1524 }
1525
1526 static void
1527 asm_writer_emit_symbol_type (MonoImageWriter *acfg, const char *name, gboolean func)
1528 {
1529         const char *stype;
1530
1531         if (func)
1532                 stype = "function";
1533         else
1534                 stype = "object";
1535
1536         asm_writer_emit_unset_mode (acfg);
1537 #if defined(TARGET_ASM_APPLE)
1538
1539 #elif defined(TARGET_ARM)
1540         fprintf (acfg->fp, "\t.type %s,#%s\n", name, stype);
1541 #else
1542         fprintf (acfg->fp, "\t.type %s,@%s\n", name, stype);
1543 #endif
1544 }
1545
1546 static void
1547 asm_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1548 {
1549         asm_writer_emit_unset_mode (acfg);
1550 #if  (defined(__ppc__) && defined(TARGET_ASM_APPLE)) || (defined(HOST_WIN32) && !defined(MONO_CROSS_COMPILE))
1551     // mach-o always uses a '_' prefix.
1552         fprintf (acfg->fp, "\t.globl _%s\n", name);
1553 #else
1554         fprintf (acfg->fp, "\t.globl %s\n", name);
1555 #endif
1556
1557         asm_writer_emit_symbol_type (acfg, name, func);
1558 }
1559
1560 static void
1561 asm_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1562 {
1563         asm_writer_emit_unset_mode (acfg);
1564
1565 #ifndef TARGET_ASM_APPLE
1566         fprintf (acfg->fp, "\t.local %s\n", name);
1567 #endif
1568
1569         asm_writer_emit_symbol_type (acfg, name, func);
1570 }
1571
1572 static void
1573 asm_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1574 {
1575         asm_writer_emit_unset_mode (acfg);
1576
1577 #ifndef TARGET_ASM_APPLE
1578         fprintf (acfg->fp, "\t.size %s,%s-%s\n", name, end_label, name);
1579 #endif
1580 }
1581
1582 static void
1583 asm_writer_emit_label (MonoImageWriter *acfg, const char *name)
1584 {
1585         asm_writer_emit_unset_mode (acfg);
1586 #if defined(HOST_WIN32) && (defined(TARGET_X86) || defined(TARGET_AMD64))
1587         fprintf (acfg->fp, "_%s:\n", name);
1588 #if defined(HOST_WIN32)
1589         /* Emit a normal label too */
1590         fprintf (acfg->fp, "%s:\n", name);
1591 #endif
1592 #else
1593         fprintf (acfg->fp, "%s:\n", get_label (name));
1594 #endif
1595
1596 }
1597
1598 static void
1599 asm_writer_emit_string (MonoImageWriter *acfg, const char *value)
1600 {
1601         asm_writer_emit_unset_mode (acfg);
1602         fprintf (acfg->fp, "\t%s \"%s\"\n", AS_STRING_DIRECTIVE, value);
1603 }
1604
1605 static void
1606 asm_writer_emit_line (MonoImageWriter *acfg)
1607 {
1608         asm_writer_emit_unset_mode (acfg);
1609         fprintf (acfg->fp, "\n");
1610 }
1611
1612 static void
1613 asm_writer_emit_alignment (MonoImageWriter *acfg, int size)
1614 {
1615         asm_writer_emit_unset_mode (acfg);
1616 #if defined(TARGET_ARM)
1617         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1618 #elif defined(__ppc__) && defined(TARGET_ASM_APPLE)
1619         // the mach-o assembler specifies alignments as powers of 2.
1620         fprintf (acfg->fp, "\t.align %d\t; ilog2\n", ilog2(size));
1621 #elif defined(TARGET_ASM_GAS)
1622         fprintf (acfg->fp, "\t.balign %d\n", size);
1623 #elif defined(TARGET_ASM_APPLE)
1624         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1625 #else
1626         fprintf (acfg->fp, "\t.align %d\n", size);
1627 #endif
1628 }
1629
1630 static void
1631 asm_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1632 {
1633         asm_writer_emit_unset_mode (acfg);
1634         fprintf (acfg->fp, "\t%s %s\n", AS_POINTER_DIRECTIVE, target ? target : "0");
1635 }
1636
1637 static void
1638 asm_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1639 {
1640         asm_writer_emit_unset_mode (acfg);
1641         asm_writer_emit_alignment (acfg, sizeof (gpointer));
1642         asm_writer_emit_pointer_unaligned (acfg, target);
1643 }
1644
1645 static char *byte_to_str;
1646
1647 static void
1648 asm_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1649 {
1650         int i;
1651         if (acfg->mode != EMIT_BYTE) {
1652                 acfg->mode = EMIT_BYTE;
1653                 acfg->col_count = 0;
1654         }
1655
1656         if (byte_to_str == NULL) {
1657                 byte_to_str = g_new0 (char, 256 * 8);
1658                 for (i = 0; i < 256; ++i) {
1659                         sprintf (byte_to_str + (i * 8), ",%d", i);
1660                 }
1661         }
1662
1663         for (i = 0; i < size; ++i, ++acfg->col_count) {
1664                 if ((acfg->col_count % 32) == 0)
1665                         fprintf (acfg->fp, "\n\t.byte %d", buf [i]);
1666                 else
1667                         fputs (byte_to_str + (buf [i] * 8), acfg->fp);
1668         }
1669 }
1670
1671 static inline void
1672 asm_writer_emit_int16 (MonoImageWriter *acfg, int value)
1673 {
1674         if (acfg->mode != EMIT_WORD) {
1675                 acfg->mode = EMIT_WORD;
1676                 acfg->col_count = 0;
1677         }
1678         if ((acfg->col_count++ % 8) == 0)
1679                 fprintf (acfg->fp, "\n\t%s ", AS_INT16_DIRECTIVE);
1680         else
1681                 fprintf (acfg->fp, ", ");
1682         fprintf (acfg->fp, "%d", value);
1683 }
1684
1685 static inline void
1686 asm_writer_emit_int32 (MonoImageWriter *acfg, int value)
1687 {
1688         if (acfg->mode != EMIT_LONG) {
1689                 acfg->mode = EMIT_LONG;
1690                 acfg->col_count = 0;
1691         }
1692         if ((acfg->col_count++ % 8) == 0)
1693                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1694         else
1695                 fprintf (acfg->fp, ",");
1696         fprintf (acfg->fp, "%d", value);
1697 }
1698
1699 static void
1700 asm_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1701 {
1702 #ifdef TARGET_ASM_APPLE
1703         char symbol [128];
1704 #endif
1705
1706         if (acfg->mode != EMIT_LONG) {
1707                 acfg->mode = EMIT_LONG;
1708                 acfg->col_count = 0;
1709         }
1710
1711         // FIXME: This doesn't seem to work on the iphone
1712 #if 0
1713         //#ifdef TARGET_ASM_APPLE
1714         /* The apple assembler needs a separate symbol to be able to handle complex expressions */
1715         sprintf (symbol, "LTMP_SYM%d", acfg->label_gen);
1716         start = get_label (start);
1717         end = get_label (end);
1718         acfg->label_gen ++;
1719         if (offset > 0)
1720                 fprintf (acfg->fp, "\n%s=%s - %s + %d", symbol, end, start, offset);
1721         else if (offset < 0)
1722                 fprintf (acfg->fp, "\n%s=%s - %s %d", symbol, end, start, offset);
1723         else
1724                 fprintf (acfg->fp, "\n%s=%s - %s", symbol, end, start);
1725
1726         fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1727         fprintf (acfg->fp, "%s", symbol);
1728 #else
1729         start = get_label (start);
1730         end = get_label (end);
1731         if ((acfg->col_count++ % 8) == 0)
1732                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1733         else
1734                 fprintf (acfg->fp, ",");
1735         if (offset > 0)
1736                 fprintf (acfg->fp, "%s - %s + %d", end, start, offset);
1737         else if (offset < 0)
1738                 fprintf (acfg->fp, "%s - %s %d", end, start, offset);
1739         else
1740                 fprintf (acfg->fp, "%s - %s", end, start);
1741 #endif
1742 }
1743
1744 static void
1745 asm_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1746 {
1747         asm_writer_emit_unset_mode (acfg);
1748         fprintf (acfg->fp, "\t%s %d\n", AS_SKIP_DIRECTIVE, num);
1749 }
1750
1751 /* EMIT FUNCTIONS */
1752
1753 void
1754 img_writer_emit_start (MonoImageWriter *acfg)
1755 {
1756 #ifdef USE_BIN_WRITER
1757         if (acfg->use_bin_writer)
1758                 bin_writer_emit_start (acfg);
1759         else
1760                 asm_writer_emit_start (acfg);
1761 #else
1762         asm_writer_emit_start (acfg);
1763 #endif
1764 }
1765
1766 void
1767 img_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1768 {
1769 #ifdef USE_BIN_WRITER
1770         if (acfg->use_bin_writer)
1771                 bin_writer_emit_section_change (acfg, section_name, subsection_index);
1772         else
1773                 asm_writer_emit_section_change (acfg, section_name, subsection_index);
1774 #else
1775         asm_writer_emit_section_change (acfg, section_name, subsection_index);
1776 #endif
1777
1778         acfg->current_section = section_name;
1779         acfg->current_subsection = subsection_index;
1780 }
1781
1782 void
1783 img_writer_emit_push_section (MonoImageWriter *acfg, const char *section_name, int subsection)
1784 {
1785         g_assert (acfg->stack_pos < 16 - 1);
1786         acfg->section_stack [acfg->stack_pos] = acfg->current_section;
1787         acfg->subsection_stack [acfg->stack_pos] = acfg->current_subsection;
1788         acfg->stack_pos ++;
1789
1790         img_writer_emit_section_change (acfg, section_name, subsection);
1791 }
1792
1793 void
1794 img_writer_emit_pop_section (MonoImageWriter *acfg)
1795 {
1796         g_assert (acfg->stack_pos > 0);
1797         acfg->stack_pos --;
1798         img_writer_emit_section_change (acfg, acfg->section_stack [acfg->stack_pos], acfg->subsection_stack [acfg->stack_pos]);
1799 }
1800
1801 void
1802 img_writer_set_section_addr (MonoImageWriter *acfg, guint64 addr)
1803 {
1804 #ifdef USE_BIN_WRITER
1805         if (!acfg->use_bin_writer)
1806                 NOT_IMPLEMENTED;
1807         else
1808                 bin_writer_set_section_addr (acfg, addr);
1809 #else
1810         NOT_IMPLEMENTED;
1811 #endif
1812 }
1813
1814 void
1815 img_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1816 {
1817 #ifdef USE_BIN_WRITER
1818         if (acfg->use_bin_writer)
1819                 bin_writer_emit_global (acfg, name, func);
1820         else
1821                 asm_writer_emit_global (acfg, name, func);
1822 #else
1823         asm_writer_emit_global (acfg, name, func);
1824 #endif
1825 }
1826
1827 void
1828 img_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1829 {
1830 #ifdef USE_BIN_WRITER
1831         if (acfg->use_bin_writer)
1832                 bin_writer_emit_local_symbol (acfg, name, end_label, func);
1833         else
1834                 asm_writer_emit_local_symbol (acfg, name, end_label, func);
1835 #else
1836         asm_writer_emit_local_symbol (acfg, name, end_label, func);
1837 #endif
1838 }
1839
1840 void
1841 img_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1842 {
1843         if (!acfg->use_bin_writer)
1844                 asm_writer_emit_symbol_size (acfg, name, end_label);
1845 }
1846
1847 void
1848 img_writer_emit_label (MonoImageWriter *acfg, const char *name)
1849 {
1850 #ifdef USE_BIN_WRITER
1851         if (acfg->use_bin_writer)
1852                 bin_writer_emit_label (acfg, name);
1853         else
1854                 asm_writer_emit_label (acfg, name);
1855 #else
1856         asm_writer_emit_label (acfg, name);
1857 #endif
1858 }
1859
1860 void
1861 img_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1862 {
1863 #ifdef USE_BIN_WRITER
1864         if (acfg->use_bin_writer)
1865                 bin_writer_emit_bytes (acfg, buf, size);
1866         else
1867                 asm_writer_emit_bytes (acfg, buf, size);
1868 #else
1869         asm_writer_emit_bytes (acfg, buf, size);
1870 #endif
1871 }
1872
1873 void
1874 img_writer_emit_string (MonoImageWriter *acfg, const char *value)
1875 {
1876 #ifdef USE_BIN_WRITER
1877         if (acfg->use_bin_writer)
1878                 bin_writer_emit_string (acfg, value);
1879         else
1880                 asm_writer_emit_string (acfg, value);
1881 #else
1882         asm_writer_emit_string (acfg, value);
1883 #endif
1884 }
1885
1886 void
1887 img_writer_emit_line (MonoImageWriter *acfg)
1888 {
1889 #ifdef USE_BIN_WRITER
1890         if (acfg->use_bin_writer)
1891                 bin_writer_emit_line (acfg);
1892         else
1893                 asm_writer_emit_line (acfg);
1894 #else
1895                 asm_writer_emit_line (acfg);
1896 #endif
1897 }
1898
1899 void
1900 img_writer_emit_alignment (MonoImageWriter *acfg, int size)
1901 {
1902 #ifdef USE_BIN_WRITER
1903         if (acfg->use_bin_writer)
1904                 bin_writer_emit_alignment (acfg, size);
1905         else
1906                 asm_writer_emit_alignment (acfg, size);
1907 #else
1908         asm_writer_emit_alignment (acfg, size);
1909 #endif
1910 }
1911
1912 void
1913 img_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1914 {
1915 #ifdef USE_BIN_WRITER
1916         if (acfg->use_bin_writer)
1917                 bin_writer_emit_pointer_unaligned (acfg, target);
1918         else
1919                 asm_writer_emit_pointer_unaligned (acfg, target);
1920 #else
1921         asm_writer_emit_pointer_unaligned (acfg, target);
1922 #endif
1923 }
1924
1925 void
1926 img_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1927 {
1928 #ifdef USE_BIN_WRITER
1929         if (acfg->use_bin_writer)
1930                 bin_writer_emit_pointer (acfg, target);
1931         else
1932                 asm_writer_emit_pointer (acfg, target);
1933 #else
1934         asm_writer_emit_pointer (acfg, target);
1935 #endif
1936 }
1937
1938 void
1939 img_writer_emit_int16 (MonoImageWriter *acfg, int value)
1940 {
1941 #ifdef USE_BIN_WRITER
1942         if (acfg->use_bin_writer)
1943                 bin_writer_emit_int16 (acfg, value);
1944         else
1945                 asm_writer_emit_int16 (acfg, value);
1946 #else
1947         asm_writer_emit_int16 (acfg, value);
1948 #endif
1949 }
1950
1951 void
1952 img_writer_emit_int32 (MonoImageWriter *acfg, int value)
1953 {
1954 #ifdef USE_BIN_WRITER
1955         if (acfg->use_bin_writer)
1956                 bin_writer_emit_int32 (acfg, value);
1957         else
1958                 asm_writer_emit_int32 (acfg, value);
1959 #else
1960         asm_writer_emit_int32 (acfg, value);
1961 #endif
1962 }
1963
1964 void
1965 img_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1966 {
1967 #ifdef USE_BIN_WRITER
1968         if (acfg->use_bin_writer)
1969                 bin_writer_emit_symbol_diff (acfg, end, start, offset);
1970         else
1971                 asm_writer_emit_symbol_diff (acfg, end, start, offset);
1972 #else
1973         asm_writer_emit_symbol_diff (acfg, end, start, offset);
1974 #endif
1975 }
1976
1977 void
1978 img_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1979 {
1980 #ifdef USE_BIN_WRITER
1981         if (acfg->use_bin_writer)
1982                 bin_writer_emit_zero_bytes (acfg, num);
1983         else
1984                 asm_writer_emit_zero_bytes (acfg, num);
1985 #else
1986         asm_writer_emit_zero_bytes (acfg, num);
1987 #endif
1988 }
1989
1990 int
1991 img_writer_emit_writeout (MonoImageWriter *acfg)
1992 {
1993 #ifdef USE_BIN_WRITER
1994         if (acfg->use_bin_writer)
1995                 return bin_writer_emit_writeout (acfg);
1996         else
1997                 return asm_writer_emit_writeout (acfg);
1998 #else
1999                 return asm_writer_emit_writeout (acfg);
2000 #endif
2001 }
2002
2003 void
2004 img_writer_emit_byte (MonoImageWriter *acfg, guint8 val)
2005 {
2006         img_writer_emit_bytes (acfg, &val, 1);
2007 }
2008
2009 /*
2010  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
2011  * Do not advance PC.
2012  */
2013 void
2014 img_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
2015 {
2016         /* This is only supported by the bin writer */
2017 #ifdef USE_BIN_WRITER
2018         if (acfg->use_bin_writer)
2019                 bin_writer_emit_reloc (acfg, reloc_type, symbol, addend);
2020         else
2021                 g_assert_not_reached ();
2022 #else
2023                 g_assert_not_reached ();
2024 #endif
2025 }
2026
2027 /*
2028  * img_writer_emit_unset_mode:
2029  *
2030  *   Flush buffered data so it is safe to write to the output file from outside this
2031  * module. This is a nop for the binary writer.
2032  */
2033 void
2034 img_writer_emit_unset_mode (MonoImageWriter *acfg)
2035 {
2036         if (!acfg->use_bin_writer)
2037                 asm_writer_emit_unset_mode (acfg);
2038 }
2039
2040 /*
2041  * img_writer_get_output:
2042  *
2043  *   Return the output buffer of a binary writer emitting to memory. The returned memory
2044  * is from malloc, and it is owned by the caller.
2045  */
2046 guint8*
2047 img_writer_get_output (MonoImageWriter *acfg, guint32 *size)
2048 {
2049 #ifdef USE_BIN_WRITER
2050         guint8 *buf;
2051
2052         g_assert (acfg->use_bin_writer);
2053
2054         buf = acfg->out_buf;
2055         *size = acfg->out_buf_size;
2056         acfg->out_buf = NULL;
2057         return buf;
2058 #else
2059         g_assert_not_reached ();
2060         return NULL;
2061 #endif
2062 }
2063
2064 /*
2065  * Return whenever the binary writer is supported on this platform.
2066  */
2067 gboolean
2068 bin_writer_supported (void)
2069 {
2070 #ifdef USE_BIN_WRITER
2071         return TRUE;
2072 #else
2073         return FALSE;
2074 #endif
2075 }
2076
2077 /*
2078  * img_writer_create:
2079  *
2080  *   Create an image writer writing to FP. If USE_BIN_WRITER is TRUE, FP can be NULL,
2081  * in this case the image writer will write to a memory buffer obtainable by calling
2082  * img_writer_get_output ().
2083  */
2084 MonoImageWriter*
2085 img_writer_create (FILE *fp, gboolean use_bin_writer)
2086 {
2087         MonoImageWriter *w = g_new0 (MonoImageWriter, 1);
2088
2089 #ifndef USE_BIN_WRITER
2090         g_assert (!use_bin_writer);
2091 #endif
2092
2093         if (!use_bin_writer)
2094                 g_assert (fp);
2095
2096         w->fp = fp;
2097         w->use_bin_writer = use_bin_writer;
2098         w->mempool = mono_mempool_new ();
2099
2100         return w;
2101 }
2102
2103 void
2104 img_writer_destroy (MonoImageWriter *w)
2105 {
2106         // FIXME: Free all the stuff
2107         mono_mempool_destroy (w->mempool);
2108         g_free (w);
2109 }
2110
2111 gboolean
2112 img_writer_subsections_supported (MonoImageWriter *acfg)
2113 {
2114 #ifdef TARGET_ASM_APPLE
2115         return acfg->use_bin_writer;
2116 #else
2117         return TRUE;
2118 #endif
2119 }
2120
2121 FILE *
2122 img_writer_get_fp (MonoImageWriter *acfg)
2123 {
2124         return acfg->fp;
2125 }
2126
2127 const char *
2128 img_writer_get_temp_label_prefix (MonoImageWriter *acfg)
2129 {
2130         return AS_TEMP_LABEL_PREFIX;
2131 }