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
  96 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
  97 #define ALIGN_PTR_TO(ptr,align) (gpointer)((((gssize)(ptr)) + (align - 1)) & (~(align - 1)))
  98 #define ROUND_DOWN(VALUE,SIZE)  ((VALUE) & ~((SIZE) - 1))
  99
 100 #if defined(TARGET_AMD64) && !defined(HOST_WIN32)
 101 #define USE_ELF_WRITER 1
 102 #define USE_ELF_RELA 1
 103 #endif
 104
 105 #if defined(TARGET_X86) && !defined(TARGET_WIN32)
 106 #define USE_ELF_WRITER 1
 107 #endif
 108
 109 #if defined(TARGET_ARM) && !defined(__MACH__)
 110 #define USE_ELF_WRITER 1
 111 #endif
 112
 113 #if defined(__mips__)
 114 #define USE_ELF_WRITER 1
 115 #endif
 116
 117 #if defined(USE_ELF_WRITER)
 118 #define USE_BIN_WRITER 1
 119 #endif
 120
 121 #ifdef USE_BIN_WRITER
 122
 123 typedef struct _BinSymbol BinSymbol;
 124 typedef struct _BinReloc BinReloc;
 125 typedef struct _BinSection BinSection;
 126
 127 #endif
 128
 129 /* emit mode */
 130 enum {
 131         EMIT_NONE,
 132         EMIT_BYTE,
 133         EMIT_WORD,
 134         EMIT_LONG
 135 };
 136
 137 struct _MonoImageWriter {
 138         MonoMemPool *mempool;
 139         char *outfile;
 140         gboolean use_bin_writer;
 141         const char *current_section;
 142         int current_subsection;
 143         const char *section_stack [16];
 144         int subsection_stack [16];
 145         int stack_pos;
 146         FILE *fp;
 147         /* Bin writer */
 148 #ifdef USE_BIN_WRITER
 149         BinSymbol *symbols;
 150         BinSection *sections;
 151         BinSection *cur_section;
 152         BinReloc *relocations;
 153         GHashTable *labels;
 154         int num_relocs;
 155         guint8 *out_buf;
 156         int out_buf_size, out_buf_pos;
 157 #endif
 158         /* Asm writer */
 159         char *tmpfname;
 160         int mode; /* emit mode */
 161         int col_count; /* bytes emitted per .byte line */
 162         int label_gen;
 163 };
 164
 165 static G_GNUC_UNUSED int
 166 ilog2(register int value)
 167 {
 168         int count = -1;
 169         while (value & ~0xf) count += 4, value >>= 4;
 170         while (value) count++, value >>= 1;
 171         return count;
 172 }
 173
 174 #ifdef USE_BIN_WRITER
 175
 176 typedef struct _BinLabel BinLabel;
 177 struct _BinLabel {
 178         char *name;
 179         BinSection *section;
 180         int offset;
 181 };
 182
 183 struct _BinReloc {
 184         BinReloc *next;
 185         char *val1;
 186         char *val2;
 187         BinSection *val2_section;
 188         int val2_offset;
 189         int offset;
 190         BinSection *section;
 191         int section_offset;
 192         int reloc_type;
 193 };
 194
 195 struct _BinSymbol {
 196         BinSymbol *next;
 197         char *name;
 198         BinSection *section;
 199         int offset;
 200         gboolean is_function;
 201         gboolean is_global;
 202         char *end_label;
 203 };
 204
 205 struct _BinSection {
 206         BinSection *next;
 207         BinSection *parent;
 208         char *name;
 209         int subsection;
 210         guint8 *data;
 211         int data_len;
 212         int cur_offset;
 213         int file_offset;
 214         int virt_offset;
 215         int shidx;
 216         guint64 addr;
 217         gboolean has_addr;
 218 };
 219
 220 static void
 221 bin_writer_emit_start (MonoImageWriter *acfg)
 222 {
 223         acfg->labels = g_hash_table_new (g_str_hash, g_str_equal);
 224 }
 225
 226 static void
 227 bin_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
 228 {
 229         BinSection *section;
 230
 231         if (acfg->cur_section && acfg->cur_section->subsection == subsection_index
 232                         && strcmp (acfg->cur_section->name, section_name) == 0)
 233                 return;
 234         for (section = acfg->sections; section; section = section->next) {
 235                 if (section->subsection == subsection_index && strcmp (section->name, section_name) == 0) {
 236                         acfg->cur_section = section;
 237                         return;
 238                 }
 239         }
 240         if (!section) {
 241                 section = g_new0 (BinSection, 1);
 242                 section->name = g_strdup (section_name);
 243                 section->subsection = subsection_index;
 244                 section->next = acfg->sections;
 245                 acfg->sections = section;
 246                 acfg->cur_section = section;
 247         }
 248 }
 249
 250 static void
 251 bin_writer_set_section_addr (MonoImageWriter *acfg, guint64 addr)
 252 {
 253         acfg->cur_section->addr = addr;
 254         acfg->cur_section->has_addr = TRUE;
 255 }
 256
 257 static void
 258 bin_writer_emit_symbol_inner (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean is_global, gboolean func)
 259 {
 260         BinSymbol *symbol = g_new0 (BinSymbol, 1);
 261         symbol->name = g_strdup (name);
 262         if (end_label)
 263                 symbol->end_label = g_strdup (end_label);
 264         symbol->is_function = func;
 265         symbol->is_global = is_global;
 266         symbol->section = acfg->cur_section;
 267         /* FIXME: we align after this call... */
 268         symbol->offset = symbol->section->cur_offset;
 269         symbol->next = acfg->symbols;
 270         acfg->symbols = symbol;
 271 }
 272
 273 static void
 274 bin_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
 275 {
 276         bin_writer_emit_symbol_inner (acfg, name, NULL, TRUE, func);
 277 }
 278
 279 static void
 280 bin_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
 281 {
 282         bin_writer_emit_symbol_inner (acfg, name, end_label, FALSE, func);
 283 }
 284
 285 static void
 286 bin_writer_emit_label (MonoImageWriter *acfg, const char *name)
 287 {
 288         BinLabel *label = g_new0 (BinLabel, 1);
 289         label->name = g_strdup (name);
 290         label->section = acfg->cur_section;
 291         label->offset = acfg->cur_section->cur_offset;
 292         g_hash_table_insert (acfg->labels, label->name, label);
 293 }
 294
 295 static void
 296 bin_writer_emit_ensure_buffer (BinSection *section, int size)
 297 {
 298         int new_offset = section->cur_offset + size;
 299         if (new_offset >= section->data_len) {
 300                 int new_size = section->data_len? section->data_len * 2: 256;
 301                 guint8 *data;
 302                 while (new_size <= new_offset)
 303                         new_size *= 2;
 304                 data = g_malloc0 (new_size);
 305                 memcpy (data, section->data, section->data_len);
 306                 g_free (section->data);
 307                 section->data = data;
 308                 section->data_len = new_size;
 309         }
 310 }
 311
 312 static void
 313 bin_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
 314 {
 315         bin_writer_emit_ensure_buffer (acfg->cur_section, size);
 316         memcpy (acfg->cur_section->data + acfg->cur_section->cur_offset, buf, size);
 317         acfg->cur_section->cur_offset += size;
 318 }
 319
 320 static void
 321 bin_writer_emit_string (MonoImageWriter *acfg, const char *value)
 322 {
 323         int size = strlen (value) + 1;
 324         bin_writer_emit_bytes (acfg, (const guint8*)value, size);
 325 }
 326
 327 static void
 328 bin_writer_emit_line (MonoImageWriter *acfg)
 329 {
 330         /* Nothing to do in binary writer */
 331 }
 332
 333 static void
 334 bin_writer_emit_alignment (MonoImageWriter *acfg, int size)
 335 {
 336         int offset = acfg->cur_section->cur_offset;
 337         int add;
 338         offset += (size - 1);
 339         offset &= ~(size - 1);
 340         add = offset - acfg->cur_section->cur_offset;
 341         if (add) {
 342                 bin_writer_emit_ensure_buffer (acfg->cur_section, add);
 343                 acfg->cur_section->cur_offset += add;
 344         }
 345 }
 346
 347 static void
 348 bin_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
 349 {
 350         BinReloc *reloc;
 351
 352         if (!target)
 353                 // FIXME:
 354                 g_assert_not_reached ();
 355         reloc = g_new0 (BinReloc, 1);
 356         reloc->val1 = g_strdup (target);
 357         reloc->section = acfg->cur_section;
 358         reloc->section_offset = acfg->cur_section->cur_offset;
 359         reloc->next = acfg->relocations;
 360         acfg->relocations = reloc;
 361         if (strcmp (reloc->section->name, ".data") == 0) {
 362                 acfg->num_relocs++;
 363                 //g_print ("reloc: %s at %d\n", target, acfg->cur_section->cur_offset);
 364         }
 365         acfg->cur_section->cur_offset += sizeof (gpointer);
 366 }
 367
 368 static void
 369 bin_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
 370 {
 371         bin_writer_emit_alignment (acfg, sizeof (gpointer));
 372         bin_writer_emit_pointer_unaligned (acfg, target);
 373 }
 374
 375 static void
 376 bin_writer_emit_int16 (MonoImageWriter *acfg, int value)
 377 {
 378         guint8 *data;
 379         bin_writer_emit_ensure_buffer (acfg->cur_section, 2);
 380         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 381         acfg->cur_section->cur_offset += 2;
 382         /* FIXME: little endian */
 383         data [0] = value;
 384         data [1] = value >> 8;
 385 }
 386
 387 static void
 388 bin_writer_emit_int32 (MonoImageWriter *acfg, int value)
 389 {
 390         guint8 *data;
 391         bin_writer_emit_ensure_buffer (acfg->cur_section, 4);
 392         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 393         acfg->cur_section->cur_offset += 4;
 394         /* FIXME: little endian */
 395         data [0] = value;
 396         data [1] = value >> 8;
 397         data [2] = value >> 16;
 398         data [3] = value >> 24;
 399 }
 400
 401 static BinReloc*
 402 create_reloc (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 403 {
 404         BinReloc *reloc;
 405         reloc = mono_mempool_alloc0 (acfg->mempool, sizeof (BinReloc));
 406         reloc->val1 = mono_mempool_strdup (acfg->mempool, end);
 407         if (strcmp (start, ".") == 0) {
 408                 reloc->val2_section = acfg->cur_section;
 409                 reloc->val2_offset = acfg->cur_section->cur_offset;
 410         } else {
 411                 reloc->val2 = mono_mempool_strdup (acfg->mempool, start);
 412         }
 413         reloc->offset = offset;
 414         reloc->section = acfg->cur_section;
 415         reloc->section_offset = acfg->cur_section->cur_offset;
 416         reloc->next = acfg->relocations;
 417         acfg->relocations = reloc;
 418         return reloc;
 419 }
 420
 421 static void
 422 bin_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 423 {
 424         create_reloc (acfg, end, start, offset);
 425         acfg->cur_section->cur_offset += 4;
 426         /*if (strcmp (reloc->section->name, ".data") == 0) {
 427                 acfg->num_relocs++;
 428                 g_print ("reloc: %s - %s + %d at %d\n", end, start, offset, acfg->cur_section->cur_offset - 4);
 429         }*/
 430 }
 431
 432 /*
 433  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
 434  * Do not advance PC.
 435  */
 436 static G_GNUC_UNUSED void
 437 bin_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
 438 {
 439         BinReloc *reloc = create_reloc (acfg, symbol, ".", addend);
 440         reloc->reloc_type = reloc_type;
 441 }
 442
 443 static void
 444 bin_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
 445 {
 446         bin_writer_emit_ensure_buffer (acfg->cur_section, num);
 447         acfg->cur_section->cur_offset += num;
 448 }
 449
 450 #ifdef USE_ELF_WRITER
 451
 452 enum {
 453         SECT_NULL,
 454         SECT_HASH,
 455         SECT_DYNSYM,
 456         SECT_DYNSTR,
 457         SECT_REL_DYN,
 458         SECT_RELA_DYN,
 459         SECT_TEXT,
 460         SECT_DYNAMIC,
 461         SECT_GOT_PLT,
 462         SECT_DATA,
 463         SECT_BSS,
 464         SECT_DEBUG_FRAME,
 465         SECT_DEBUG_INFO,
 466         SECT_DEBUG_ABBREV,
 467         SECT_DEBUG_LINE,
 468         SECT_DEBUG_LOC,
 469         SECT_SHSTRTAB,
 470         SECT_SYMTAB,
 471         SECT_STRTAB,
 472         SECT_NUM
 473 };
 474
 475 #if SIZEOF_VOID_P == 4
 476
 477 typedef Elf32_Ehdr ElfHeader;
 478 typedef Elf32_Shdr ElfSectHeader;
 479 typedef Elf32_Phdr ElfProgHeader;
 480 typedef Elf32_Sym ElfSymbol;
 481 typedef Elf32_Rel ElfReloc;
 482 typedef Elf32_Rela ElfRelocA;
 483 typedef Elf32_Dyn ElfDynamic;
 484
 485 #else
 486
 487 typedef Elf64_Ehdr ElfHeader;
 488 typedef Elf64_Shdr ElfSectHeader;
 489 typedef Elf64_Phdr ElfProgHeader;
 490 typedef Elf64_Sym ElfSymbol;
 491 typedef Elf64_Rel ElfReloc;
 492 typedef Elf64_Rela ElfRelocA;
 493 typedef Elf64_Dyn ElfDynamic;
 494
 495 #endif
 496
 497 typedef struct {
 498         const char *name;
 499         int type;
 500         int esize;
 501         int flags;
 502         int align;
 503 } SectInfo;
 504
 505 static SectInfo section_info [] = {
 506         {"", 0, 0, 0, 0},
 507         {".hash", SHT_HASH, 4, 2, SIZEOF_VOID_P},
 508         {".dynsym", SHT_DYNSYM, sizeof (ElfSymbol), 2, SIZEOF_VOID_P},
 509         {".dynstr", SHT_STRTAB, 0, 2, 1},
 510         {".rel.dyn", SHT_REL, sizeof (ElfReloc), 2, SIZEOF_VOID_P},
 511         {".rela.dyn", SHT_RELA, sizeof (ElfRelocA), 2, SIZEOF_VOID_P},
 512         {".text", SHT_PROGBITS, 0, 6, 4096},
 513         {".dynamic", SHT_DYNAMIC, sizeof (ElfDynamic), 3, SIZEOF_VOID_P},
 514         {".got.plt", SHT_PROGBITS, SIZEOF_VOID_P, 3, SIZEOF_VOID_P},
 515         {".data", SHT_PROGBITS, 0, 3, 8},
 516         {".bss", SHT_NOBITS, 0, 3, 8},
 517         {".debug_frame", SHT_PROGBITS, 0, 0, 8},
 518         {".debug_info", SHT_PROGBITS, 0, 0, 1},
 519         {".debug_abbrev", SHT_PROGBITS, 0, 0, 1},
 520         {".debug_line", SHT_PROGBITS, 0, 0, 1},
 521         {".debug_loc", SHT_PROGBITS, 0, 0, 1},
 522         {".shstrtab", SHT_STRTAB, 0, 0, 1},
 523         {".symtab", SHT_SYMTAB, sizeof (ElfSymbol), 0, SIZEOF_VOID_P},
 524         {".strtab", SHT_STRTAB, 0, 0, 1}
 525 };
 526
 527 typedef struct {
 528         GString *data;
 529         GHashTable *hash;
 530 } ElfStrTable;
 531
 532 static int
 533 str_table_add (ElfStrTable *table, const char* value)
 534 {
 535         int idx;
 536         if (!table->data) {
 537                 table->data = g_string_new_len ("", 1);
 538                 table->hash = g_hash_table_new (g_str_hash, g_str_equal);
 539         }
 540         idx = GPOINTER_TO_UINT (g_hash_table_lookup (table->hash, value));
 541         if (idx)
 542                 return idx;
 543         idx = table->data->len;
 544         g_string_append (table->data, value);
 545         g_string_append_c (table->data, 0);
 546         g_hash_table_insert (table->hash, (void*)value, GUINT_TO_POINTER (idx));
 547         return idx;
 548 }
 549
 550 static void
 551 append_subsection (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection *sect, BinSection *add)
 552 {
 553         int offset = sect->cur_offset;
 554         /*offset += (sheaders [sect->shidx].sh_addralign - 1);
 555         offset &= ~(sheaders [sect->shidx].sh_addralign - 1);*/
 556         /*
 557          * FIXME: we shouldn't align subsections at all, but if we don't then the
 558          * stuff inside the subsections which is aligned won't get aligned.
 559          */
 560         if (strcmp (sect->name, ".debug_line") != 0) {
 561                 offset += (8 - 1);
 562                 offset &= ~(8 - 1);
 563         }
 564         bin_writer_emit_ensure_buffer (sect, offset);
 565         //g_print ("section %s aligned to %d from %d\n", sect->name, offset, sect->cur_offset);
 566         sect->cur_offset = offset;
 567
 568         bin_writer_emit_ensure_buffer (sect, add->cur_offset);
 569         memcpy (sect->data + sect->cur_offset, add->data, add->cur_offset);
 570         add->parent = sect;
 571         sect->cur_offset += add->cur_offset;
 572         add->cur_offset = offset; /* it becomes the offset in the parent section */
 573         //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);
 574         add->data = NULL;
 575         add->data_len = 0;
 576 }
 577
 578 /* merge the subsections */
 579 static int
 580 collect_sections (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection **out, int num)
 581 {
 582         int i, j, maxs, num_sections;
 583         BinSection *sect;
 584
 585         num_sections = 0;
 586         maxs = 0;
 587         for (sect = acfg->sections; sect; sect = sect->next) {
 588                 if (sect->subsection == 0) {
 589                         out [num_sections++] = sect;
 590                         g_assert (num_sections < num);
 591                 }
 592                 maxs = MAX (maxs, sect->subsection);
 593         }
 594         for (i = 0; i < num_sections; i++) {
 595                 for (j = 1; j <= maxs; ++j) {
 596                         for (sect = acfg->sections; sect; sect = sect->next) {
 597                                 if (sect->subsection == j && strcmp (out [i]->name, sect->name) == 0) {
 598                                         append_subsection (acfg, sheaders, out [i], sect);
 599                                 }
 600                         }
 601                 }
 602         }
 603         return num_sections;
 604 }
 605
 606 static unsigned long
 607 elf_hash (const unsigned char *name)
 608 {
 609         unsigned long h = 0, g;
 610         while (*name) {
 611                 h = (h << 4) + *name++;
 612                 if ((g = h & 0xf0000000))
 613                         h ^= g >> 24;
 614                 h &= ~g;
 615         }
 616         return h;
 617 }
 618
 619 #define NUM_BUCKETS 17
 620
 621 static int*
 622 build_hash (MonoImageWriter *acfg, int num_sections, ElfStrTable *dynstr)
 623 {
 624         int *data;
 625         int num_symbols = 1 + num_sections + 3;
 626         BinSymbol *symbol;
 627
 628         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 629                 if (!symbol->is_global)
 630                         continue;
 631                 num_symbols++;
 632                 str_table_add (dynstr, symbol->name);
 633                 /*g_print ("adding sym: %s\n", symbol->name);*/
 634         }
 635         str_table_add (dynstr, "__bss_start");
 636         str_table_add (dynstr, "_edata");
 637         str_table_add (dynstr, "_end");
 638
 639         data = g_new0 (int, num_symbols + 2 + NUM_BUCKETS);
 640         data [0] = NUM_BUCKETS;
 641         data [1] = num_symbols;
 642
 643         return data;
 644 }
 645
 646 static gsize
 647 get_label_addr (MonoImageWriter *acfg, const char *name)
 648 {
 649         int offset;
 650         BinLabel *lab;
 651         BinSection *section;
 652         gsize value;
 653
 654         lab = g_hash_table_lookup (acfg->labels, name);
 655         if (!lab)
 656                 g_error ("Undefined label: '%s'.\n", name);
 657         section = lab->section;
 658         offset = lab->offset;
 659         if (section->parent) {
 660                 value = section->parent->virt_offset + section->cur_offset + offset;
 661         } else {
 662                 value = section->virt_offset + offset;
 663         }
 664         return value;
 665 }
 666
 667 static ElfSymbol*
 668 collect_syms (MonoImageWriter *acfg, int *hash, ElfStrTable *strtab, ElfSectHeader *sheaders, int *num_syms)
 669 {
 670         ElfSymbol *symbols;
 671         BinSymbol *symbol;
 672         BinSection *section;
 673         int i;
 674         int *bucket;
 675         int *chain;
 676         unsigned long hashc;
 677
 678         if (hash)
 679                 symbols = g_new0 (ElfSymbol, hash [1]);
 680         else {
 681                 i = 0;
 682                 for (symbol = acfg->symbols; symbol; symbol = symbol->next)
 683                         i ++;
 684
 685                 symbols = g_new0 (ElfSymbol, i + SECT_NUM + 10); /* FIXME */
 686         }
 687
 688         /* the first symbol is undef, all zeroes */
 689         i = 1;
 690         if (sheaders) {
 691                 int j;
 692                 for (j = 1; j < SECT_NUM; ++j) {
 693                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 694                         symbols [i].st_shndx = j;
 695                         symbols [i].st_value = sheaders [j].sh_addr;
 696                         ++i;
 697                 }
 698         } else {
 699                 for (section = acfg->sections; section; section = section->next) {
 700                         if (section->parent)
 701                                 continue;
 702                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 703                         if (strcmp (section->name, ".text") == 0) {
 704                                 symbols [i].st_shndx = SECT_TEXT;
 705                                 section->shidx = SECT_TEXT;
 706                                 section->file_offset = 4096;
 707                                 symbols [i].st_value = section->virt_offset;
 708                         } else if (strcmp (section->name, ".data") == 0) {
 709                                 symbols [i].st_shndx = SECT_DATA;
 710                                 section->shidx = SECT_DATA;
 711                                 section->file_offset = 4096 + 28; /* FIXME */
 712                                 symbols [i].st_value = section->virt_offset;
 713                         } else if (strcmp (section->name, ".bss") == 0) {
 714                                 symbols [i].st_shndx = SECT_BSS;
 715                                 section->shidx = SECT_BSS;
 716                                 section->file_offset = 4096 + 28 + 8; /* FIXME */
 717                                 symbols [i].st_value = section->virt_offset;
 718                         }
 719                         ++i;
 720                 }
 721         }
 722         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 723                 int offset;
 724                 BinLabel *lab;
 725                 if (!symbol->is_global && hash)
 726                         continue;
 727                 symbols [i].st_info = ELF32_ST_INFO (symbol->is_global ? STB_GLOBAL : STB_LOCAL, symbol->is_function? STT_FUNC : STT_OBJECT);
 728                 symbols [i].st_name = str_table_add (strtab, symbol->name);
 729                 /*g_print ("sym name %s tabled to %d\n", symbol->name, symbols [i].st_name);*/
 730                 section = symbol->section;
 731                 symbols [i].st_shndx = section->parent? section->parent->shidx: section->shidx;
 732                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 733                 offset = lab->offset;
 734                 if (section->parent) {
 735                         symbols [i].st_value = section->parent->virt_offset + section->cur_offset + offset;
 736                 } else {
 737                         symbols [i].st_value = section->virt_offset + offset;
 738                 }
 739
 740                 if (symbol->end_label) {
 741                         BinLabel *elab = g_hash_table_lookup (acfg->labels, symbol->end_label);
 742                         g_assert (elab);
 743                         symbols [i].st_size = elab->offset - lab->offset;
 744                 }
 745                 ++i;
 746         }
 747         /* add special symbols */
 748         symbols [i].st_name = str_table_add (strtab, "__bss_start");
 749         symbols [i].st_shndx = 0xfff1;
 750         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 751         ++i;
 752         symbols [i].st_name = str_table_add (strtab, "_edata");
 753         symbols [i].st_shndx = 0xfff1;
 754         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 755         ++i;
 756         symbols [i].st_name = str_table_add (strtab, "_end");
 757         symbols [i].st_shndx = 0xfff1;
 758         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 759         ++i;
 760
 761         if (num_syms)
 762                 *num_syms = i;
 763
 764         /* add to hash table */
 765         if (hash) {
 766                 bucket = hash + 2;
 767                 chain = hash + 2 + hash [0];
 768                 for (i = 0; i < hash [1]; ++i) {
 769                         int slot;
 770                         /*g_print ("checking %d '%s' (sym %d)\n", symbols [i].st_name, strtab->data->str + symbols [i].st_name, i);*/
 771                         if (!symbols [i].st_name)
 772                                 continue;
 773                         hashc = elf_hash ((guint8*)strtab->data->str + symbols [i].st_name);
 774                         slot = hashc % hash [0];
 775                         /*g_print ("hashing '%s' at slot %d (sym %d)\n", strtab->data->str + symbols [i].st_name, slot, i);*/
 776                         if (bucket [slot]) {
 777                                 chain [i] = bucket [slot];
 778                                 bucket [slot] = i;
 779                         } else {
 780                                 bucket [slot] = i;
 781                         }
 782                 }
 783         }
 784         return symbols;
 785 }
 786
 787 static void
 788 reloc_symbols (MonoImageWriter *acfg, ElfSymbol *symbols, ElfSectHeader *sheaders, ElfStrTable *strtab, gboolean dynamic)
 789 {
 790         BinSection *section;
 791         BinSymbol *symbol;
 792         int i;
 793
 794         i = 1;
 795         if (dynamic) {
 796                 for (section = acfg->sections; section; section = section->next) {
 797                         if (section->parent)
 798                                 continue;
 799                         symbols [i].st_value = sheaders [section->shidx].sh_addr;
 800                         ++i;
 801                 }
 802         } else {
 803                 for (i = 1; i < SECT_NUM; ++i) {
 804                         symbols [i].st_value = sheaders [i].sh_addr;
 805                 }
 806         }
 807         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 808                 int offset;
 809                 BinLabel *lab;
 810                 if (dynamic && !symbol->is_global)
 811                         continue;
 812                 section = symbol->section;
 813                 lab = g_hash_table_lookup (acfg->labels, symbol->name);
 814                 offset = lab->offset;
 815                 if (section->parent) {
 816                         symbols [i].st_value = sheaders [section->parent->shidx].sh_addr + section->cur_offset + offset;
 817                 } else {
 818                         symbols [i].st_value = sheaders [section->shidx].sh_addr + offset;
 819                 }
 820                 ++i;
 821         }
 822         /* __bss_start */
 823         symbols [i].st_value = sheaders [SECT_BSS].sh_addr;
 824         ++i;
 825         /* _edata */
 826         symbols [i].st_value = sheaders [SECT_DATA].sh_addr + sheaders [SECT_DATA].sh_size;
 827         ++i;
 828         /* _end */
 829         symbols [i].st_value = sheaders [SECT_BSS].sh_addr + sheaders [SECT_BSS].sh_size;
 830         ++i;
 831 }
 832
 833 static void
 834 resolve_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 **out_data, gsize *out_vaddr, gsize *out_start_val, gsize *out_end_val)
 835 {
 836         guint8 *data;
 837         gssize end_val, start_val;
 838         gsize vaddr;
 839
 840         end_val = get_label_addr (acfg, reloc->val1);
 841         if (reloc->val2) {
 842                 start_val = get_label_addr (acfg, reloc->val2);
 843         } else if (reloc->val2_section) {
 844                 start_val = reloc->val2_offset;
 845                 if (reloc->val2_section->parent)
 846                         start_val += reloc->val2_section->parent->virt_offset + reloc->val2_section->cur_offset;
 847                 else
 848                         start_val += reloc->val2_section->virt_offset;
 849         } else {
 850                 start_val = 0;
 851         }
 852         end_val = end_val - start_val + reloc->offset;
 853         if (reloc->section->parent) {
 854                 data = reloc->section->parent->data;
 855                 data += reloc->section->cur_offset;
 856                 data += reloc->section_offset;
 857                 vaddr = reloc->section->parent->virt_offset;
 858                 vaddr += reloc->section->cur_offset;
 859                 vaddr += reloc->section_offset;
 860         } else {
 861                 data = reloc->section->data;
 862                 data += reloc->section_offset;
 863                 vaddr = reloc->section->virt_offset;
 864                 vaddr += reloc->section_offset;
 865         }
 866
 867         *out_start_val = start_val;
 868         *out_end_val = end_val;
 869         *out_data = data;
 870         *out_vaddr = vaddr;
 871 }
 872
 873 #ifdef USE_ELF_RELA
 874
 875 static ElfRelocA*
 876 resolve_relocations (MonoImageWriter *acfg)
 877 {
 878         BinReloc *reloc;
 879         guint8 *data;
 880         gsize end_val, start_val;
 881         ElfRelocA *rr;
 882         int i;
 883         gsize vaddr;
 884
 885         rr = g_new0 (ElfRelocA, acfg->num_relocs);
 886         i = 0;
 887
 888         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 889                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 890                 /* FIXME: little endian */
 891                 data [0] = end_val;
 892                 data [1] = end_val >> 8;
 893                 data [2] = end_val >> 16;
 894                 data [3] = end_val >> 24;
 895                 // FIXME:
 896                 if (start_val == 0 && reloc->val1 [0] != '.') {
 897                         rr [i].r_offset = vaddr;
 898                         rr [i].r_info = R_X86_64_RELATIVE;
 899                         rr [i].r_addend = end_val;
 900                         ++i;
 901                         g_assert (i <= acfg->num_relocs);
 902                 }
 903         }
 904         return rr;
 905 }
 906
 907 #else /* USE_ELF_RELA */
 908
 909 static void
 910 do_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 *data, gssize addr)
 911 {
 912 #ifdef TARGET_ARM
 913         /*
 914          * We use the official ARM relocation types, but implement only the stuff actually
 915          * needed by the code we generate.
 916          */
 917         switch (reloc->reloc_type) {
 918         case R_ARM_CALL:
 919         case R_ARM_JUMP24: {
 920                 guint32 *code = (guint32*)(gpointer)data;
 921                 guint32 ins = *code;
 922                 int diff = addr;
 923
 924                 if (reloc->reloc_type == R_ARM_CALL)
 925                         /* bl */
 926                         g_assert (data [3] == 0xeb);
 927                 else
 928                         /* b */
 929                         g_assert (data [3] == 0xea);
 930                 if (diff >= 0 && diff <= 33554431) {
 931                         diff >>= 2;
 932                         ins = (ins & 0xff000000) | diff;
 933                         *code = ins;
 934                 } else if (diff <= 0 && diff >= -33554432) {
 935                         diff >>= 2;
 936                         ins = (ins & 0xff000000) | (diff & ~0xff000000);
 937                         *code = ins;
 938                 } else {
 939                         g_assert_not_reached ();
 940                 }
 941                 break;
 942         }
 943         case R_ARM_ALU_PC_G0_NC: {
 944                 /* Generated by emit_plt () */
 945                 guint8 *code = data;
 946                 guint32 val = addr;
 947
 948                 g_assert (val <= 0xffffff);
 949                 if (val & 0xff0000)
 950                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, (val & 0xFF0000) >> 16, 16);
 951                 else
 952                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, 0, 0);
 953                 ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_IP, (val & 0xFF00) >> 8, 24);
 954                 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, val & 0xFF);
 955                 break;
 956         }
 957         default:
 958                 g_assert_not_reached ();
 959         }
 960 #else
 961         g_assert_not_reached ();
 962 #endif
 963 }
 964
 965 static ElfReloc*
 966 resolve_relocations (MonoImageWriter *acfg)
 967 {
 968         BinReloc *reloc;
 969         guint8 *data;
 970         gsize end_val, start_val;
 971         ElfReloc *rr;
 972         int i;
 973         gsize vaddr;
 974
 975         rr = g_new0 (ElfReloc, acfg->num_relocs);
 976         i = 0;
 977
 978         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 979                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 980                 /* FIXME: little endian */
 981                 if (reloc->reloc_type) {
 982                         /* Must be static */
 983                         g_assert (start_val > 0);
 984                         do_reloc (acfg, reloc, data, end_val);
 985                 } else {
 986                         data [0] = end_val;
 987                         data [1] = end_val >> 8;
 988                         data [2] = end_val >> 16;
 989                         data [3] = end_val >> 24;
 990                 }
 991                 // FIXME:
 992                 if (start_val == 0 && reloc->val1 [0] != '.') {
 993                         rr [i].r_offset = vaddr;
 994                         rr [i].r_info = R_386_RELATIVE;
 995                         ++i;
 996                         g_assert (i <= acfg->num_relocs);
 997                 }
 998         }
 999         return rr;
1000 }
1001
1002 #endif /* USE_ELF_RELA */
1003
1004 static void
1005 bin_writer_fwrite (MonoImageWriter *acfg, void *val, size_t size, size_t nmemb)
1006 {
1007         if (acfg->fp)
1008                 fwrite (val, size, nmemb, acfg->fp);
1009         else {
1010                 g_assert (acfg->out_buf_pos + (size * nmemb) <= acfg->out_buf_size);
1011                 memcpy (acfg->out_buf + acfg->out_buf_pos, val, size * nmemb);
1012                 acfg->out_buf_pos += (size * nmemb);
1013         }
1014 }
1015
1016 static void
1017 bin_writer_fseek (MonoImageWriter *acfg, int offset)
1018 {
1019         if (acfg->fp)
1020                 fseek (acfg->fp, offset, SEEK_SET);
1021         else
1022                 acfg->out_buf_pos = offset;
1023 }
1024
1025 static int normal_sections [] = { SECT_DATA, SECT_DEBUG_FRAME, SECT_DEBUG_INFO, SECT_DEBUG_ABBREV, SECT_DEBUG_LINE, SECT_DEBUG_LOC };
1026
1027 static int
1028 bin_writer_emit_writeout (MonoImageWriter *acfg)
1029 {
1030         FILE *file;
1031         ElfHeader header;
1032         ElfProgHeader progh [3];
1033         ElfSectHeader secth [SECT_NUM];
1034 #ifdef USE_ELF_RELA
1035         ElfRelocA *relocs;
1036 #else
1037         ElfReloc *relocs;
1038 #endif
1039         ElfStrTable str_table = {NULL, NULL};
1040         ElfStrTable sh_str_table = {NULL, NULL};
1041         ElfStrTable dyn_str_table = {NULL, NULL};
1042         BinSection* all_sections [32];
1043         BinSection* sections [SECT_NUM];
1044         ElfSymbol *dynsym;
1045         ElfSymbol *symtab;
1046         ElfDynamic dynamic [14];
1047         int *hash;
1048         int i, num_sections, file_offset, virt_offset, size, num_symtab;
1049         int num_local_syms;
1050
1051         file = acfg->fp;
1052
1053         /* Section headers */
1054         memset (&secth, 0, sizeof (secth));
1055         memset (&dynamic, 0, sizeof (dynamic));
1056         memset (&header, 0, sizeof (header));
1057
1058         for (i = 1; i < SECT_NUM; ++i) {
1059                 secth [i].sh_name = str_table_add (&sh_str_table, section_info [i].name);
1060                 secth [i].sh_type = section_info [i].type;
1061                 secth [i].sh_addralign = section_info [i].align;
1062                 secth [i].sh_flags = section_info [i].flags;
1063                 secth [i].sh_entsize = section_info [i].esize;
1064         }
1065         secth [SECT_DYNSYM].sh_info = SIZEOF_VOID_P == 4 ? 4 : 2;
1066         secth [SECT_SYMTAB].sh_info = SIZEOF_VOID_P == 4 ? 20 : 17;
1067         secth [SECT_HASH].sh_link = SECT_DYNSYM;
1068         secth [SECT_DYNSYM].sh_link = SECT_DYNSTR;
1069         secth [SECT_REL_DYN].sh_link = SECT_DYNSYM;
1070         secth [SECT_RELA_DYN].sh_link = SECT_DYNSYM;
1071         secth [SECT_DYNAMIC].sh_link = SECT_DYNSTR;
1072         secth [SECT_SYMTAB].sh_link = SECT_STRTAB;
1073
1074         num_sections = collect_sections (acfg, secth, all_sections, 16);
1075         hash = build_hash (acfg, num_sections, &dyn_str_table);
1076         num_symtab = hash [1]; /* FIXME */
1077 #if 0
1078         g_print ("num_sections: %d\n", num_sections);
1079         g_print ("dynsym: %d, dynstr size: %d\n", hash [1], (int)dyn_str_table.data->len);
1080         for (i = 0; i < num_sections; ++i) {
1081                 g_print ("section %s, size: %d, %x\n", all_sections [i]->name, all_sections [i]->cur_offset, all_sections [i]->cur_offset);
1082         }
1083 #endif
1084         /* Associate the bin sections with the ELF sections */
1085         memset (sections, 0, sizeof (sections));
1086         for (i = 0; i < num_sections; ++i) {
1087                 BinSection *sect = all_sections [i];
1088                 int j;
1089
1090                 for (j = 0; j < SECT_NUM; ++j) {
1091                         if (strcmp (sect->name, section_info [j].name) == 0) {
1092                                 sect->shidx = j;
1093                                 break;
1094                         }
1095                 }
1096
1097                 sections [all_sections [i]->shidx] = sect;
1098         }
1099
1100         /* at this point we know where in the file the first segment sections go */
1101         dynsym = collect_syms (acfg, hash, &dyn_str_table, NULL, NULL);
1102         num_local_syms = hash [1];
1103         symtab = collect_syms (acfg, NULL, &str_table, secth, &num_local_syms);
1104
1105         file_offset = virt_offset = sizeof (header) + sizeof (progh);
1106         secth [SECT_HASH].sh_addr = secth [SECT_HASH].sh_offset = file_offset;
1107         size = sizeof (int) * (2 + hash [0] + hash [1]);
1108         virt_offset = (file_offset += size);
1109         secth [SECT_HASH].sh_size = size;
1110         secth [SECT_DYNSYM].sh_addr = secth [SECT_DYNSYM].sh_offset = file_offset;
1111         size = sizeof (ElfSymbol) * hash [1];
1112         virt_offset = (file_offset += size);
1113         secth [SECT_DYNSYM].sh_size = size;
1114         secth [SECT_DYNSTR].sh_addr = secth [SECT_DYNSTR].sh_offset = file_offset;
1115         size = dyn_str_table.data->len;
1116         virt_offset = (file_offset += size);
1117         secth [SECT_DYNSTR].sh_size = size;
1118         file_offset += 4-1;
1119         file_offset &= ~(4-1);
1120         secth [SECT_REL_DYN].sh_addr = secth [SECT_REL_DYN].sh_offset = file_offset;
1121 #ifndef USE_ELF_RELA
1122         size = sizeof (ElfReloc) * acfg->num_relocs;
1123 #else
1124         size = 0;
1125 #endif
1126         virt_offset = (file_offset += size);
1127         secth [SECT_REL_DYN].sh_size = size;
1128         secth [SECT_RELA_DYN].sh_addr = secth [SECT_RELA_DYN].sh_offset = file_offset;
1129 #ifdef USE_ELF_RELA
1130         size = sizeof (ElfRelocA) * acfg->num_relocs;
1131 #else
1132         size = 0;
1133 #endif
1134         virt_offset = (file_offset += size);
1135         secth [SECT_RELA_DYN].sh_size = size;
1136
1137         file_offset = ALIGN_TO (file_offset, secth [SECT_TEXT].sh_addralign);
1138         virt_offset = file_offset;
1139         secth [SECT_TEXT].sh_addr = secth [SECT_TEXT].sh_offset = file_offset;
1140         if (sections [SECT_TEXT]) {
1141                 if (sections [SECT_TEXT]->has_addr) {
1142                         secth [SECT_TEXT].sh_addr = sections [SECT_TEXT]->addr;
1143                         secth [SECT_TEXT].sh_flags &= ~SHF_ALLOC;
1144                 }
1145                 size = sections [SECT_TEXT]->cur_offset;
1146                 secth [SECT_TEXT].sh_size = size;
1147                 file_offset += size;
1148         }
1149
1150         file_offset = ALIGN_TO (file_offset, secth [SECT_DYNAMIC].sh_addralign);
1151         virt_offset = file_offset;
1152
1153         /* .dynamic, .got.plt, .data, .bss here */
1154         /* Have to increase the virt offset since these go to a separate segment */
1155         virt_offset += PAGESIZE;
1156         secth [SECT_DYNAMIC].sh_addr = virt_offset;
1157         secth [SECT_DYNAMIC].sh_offset = file_offset;
1158         size = sizeof (dynamic);
1159         secth [SECT_DYNAMIC].sh_size = size;
1160         file_offset += size;
1161         virt_offset += size;
1162
1163         file_offset = ALIGN_TO (file_offset, secth [SECT_GOT_PLT].sh_addralign);
1164         virt_offset = ALIGN_TO (virt_offset, secth [SECT_GOT_PLT].sh_addralign);
1165         secth [SECT_GOT_PLT].sh_addr = virt_offset;
1166         secth [SECT_GOT_PLT].sh_offset = file_offset;
1167         size = 12;
1168         secth [SECT_GOT_PLT].sh_size = size;
1169         file_offset += size;
1170         virt_offset += size;
1171
1172         file_offset = ALIGN_TO (file_offset, secth [SECT_DATA].sh_addralign);
1173         virt_offset = ALIGN_TO (virt_offset, secth [SECT_DATA].sh_addralign);
1174         secth [SECT_DATA].sh_addr = virt_offset;
1175         secth [SECT_DATA].sh_offset = file_offset;
1176         if (sections [SECT_DATA]) {
1177                 size = sections [SECT_DATA]->cur_offset;
1178                 secth [SECT_DATA].sh_size = size;
1179                 file_offset += size;
1180                 virt_offset += size;
1181         }
1182
1183         file_offset = ALIGN_TO (file_offset, secth [SECT_BSS].sh_addralign);
1184         virt_offset = ALIGN_TO (virt_offset, secth [SECT_BSS].sh_addralign);
1185         secth [SECT_BSS].sh_addr = virt_offset;
1186         secth [SECT_BSS].sh_offset = file_offset;
1187         if (sections [SECT_BSS]) {
1188                 size = sections [SECT_BSS]->cur_offset;
1189                 secth [SECT_BSS].sh_size = size;
1190         }
1191
1192         /* virtual doesn't matter anymore */
1193         file_offset = ALIGN_TO (file_offset, secth [SECT_DEBUG_FRAME].sh_addralign);
1194         secth [SECT_DEBUG_FRAME].sh_offset = file_offset;
1195         if (sections [SECT_DEBUG_FRAME])
1196                 size = sections [SECT_DEBUG_FRAME]->cur_offset;
1197         else
1198                 size = 0;
1199         secth [SECT_DEBUG_FRAME].sh_size = size;
1200         file_offset += size;
1201
1202         secth [SECT_DEBUG_INFO].sh_offset = file_offset;
1203         if (sections [SECT_DEBUG_INFO])
1204                 size = sections [SECT_DEBUG_INFO]->cur_offset;
1205         else
1206                 size = 0;
1207         secth [SECT_DEBUG_INFO].sh_size = size;
1208         file_offset += size;
1209
1210         secth [SECT_DEBUG_ABBREV].sh_offset = file_offset;
1211         if (sections [SECT_DEBUG_ABBREV])
1212                 size = sections [SECT_DEBUG_ABBREV]->cur_offset;
1213         else
1214                 size = 0;
1215         secth [SECT_DEBUG_ABBREV].sh_size = size;
1216         file_offset += size;
1217
1218         secth [SECT_DEBUG_LINE].sh_offset = file_offset;
1219         if (sections [SECT_DEBUG_LINE])
1220                 size = sections [SECT_DEBUG_LINE]->cur_offset;
1221         else
1222                 size = 0;
1223         secth [SECT_DEBUG_LINE].sh_size = size;
1224         file_offset += size;
1225
1226         secth [SECT_DEBUG_LOC].sh_offset = file_offset;
1227         if (sections [SECT_DEBUG_LOC])
1228                 size = sections [SECT_DEBUG_LOC]->cur_offset;
1229         else
1230                 size = 0;
1231         secth [SECT_DEBUG_LOC].sh_size = size;
1232         file_offset += size;
1233
1234         file_offset = ALIGN_TO (file_offset, secth [SECT_SHSTRTAB].sh_addralign);
1235         secth [SECT_SHSTRTAB].sh_offset = file_offset;
1236         size = sh_str_table.data->len;
1237         secth [SECT_SHSTRTAB].sh_size = size;
1238         file_offset += size;
1239
1240         file_offset = ALIGN_TO (file_offset, secth [SECT_SYMTAB].sh_addralign);
1241         secth [SECT_SYMTAB].sh_offset = file_offset;
1242         size = sizeof (ElfSymbol) * num_local_syms;
1243         secth [SECT_SYMTAB].sh_size = size;
1244         file_offset += size;
1245
1246         file_offset = ALIGN_TO (file_offset, secth [SECT_STRTAB].sh_addralign);
1247         secth [SECT_STRTAB].sh_offset = file_offset;
1248         size = str_table.data->len;
1249         secth [SECT_STRTAB].sh_size = size;
1250         file_offset += size;
1251
1252         file_offset += 4-1;
1253         file_offset &= ~(4-1);
1254
1255         header.e_ident [EI_MAG0] = ELFMAG0;
1256         header.e_ident [EI_MAG1] = ELFMAG1;
1257         header.e_ident [EI_MAG2] = ELFMAG2;
1258         header.e_ident [EI_MAG3] = ELFMAG3;
1259         header.e_ident [EI_CLASS] = SIZEOF_VOID_P == 4 ? ELFCLASS32 : ELFCLASS64;
1260         header.e_ident [EI_DATA] = ELFDATA2LSB;
1261         header.e_ident [EI_VERSION] = EV_CURRENT;
1262         header.e_ident [EI_OSABI] = ELFOSABI_NONE;
1263         header.e_ident [EI_ABIVERSION] = 0;
1264         for (i = EI_PAD; i < EI_NIDENT; ++i)
1265                 header.e_ident [i] = 0;
1266
1267         header.e_type = ET_DYN;
1268 #if defined(TARGET_X86)
1269         header.e_machine = EM_386;
1270 #elif defined(TARGET_AMD64)
1271         header.e_machine = EM_X86_64;
1272 #elif defined(TARGET_ARM)
1273         header.e_machine = EM_ARM;
1274 #else
1275         g_assert_not_reached ();
1276 #endif
1277         header.e_version = 1;
1278
1279         header.e_phoff = sizeof (header);
1280         header.e_ehsize = sizeof (header);
1281         header.e_phentsize = sizeof (ElfProgHeader);
1282         header.e_phnum = 3;
1283         header.e_entry = secth [SECT_TEXT].sh_addr;
1284         header.e_shstrndx = SECT_SHSTRTAB;
1285         header.e_shentsize = sizeof (ElfSectHeader);
1286         header.e_shnum = SECT_NUM;
1287         header.e_shoff = file_offset;
1288
1289         /* dynamic data */
1290         i = 0;
1291         dynamic [i].d_tag = DT_HASH;
1292         dynamic [i].d_un.d_val = secth [SECT_HASH].sh_offset;
1293         ++i;
1294         dynamic [i].d_tag = DT_STRTAB;
1295         dynamic [i].d_un.d_val = secth [SECT_DYNSTR].sh_offset;
1296         ++i;
1297         dynamic [i].d_tag = DT_SYMTAB;
1298         dynamic [i].d_un.d_val = secth [SECT_DYNSYM].sh_offset;
1299         ++i;
1300         dynamic [i].d_tag = DT_STRSZ;
1301         dynamic [i].d_un.d_val = dyn_str_table.data->len;
1302         ++i;
1303         dynamic [i].d_tag = DT_SYMENT;
1304         dynamic [i].d_un.d_val = sizeof (ElfSymbol);
1305         ++i;
1306 #ifdef USE_ELF_RELA
1307         dynamic [i].d_tag = DT_RELA;
1308         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_offset;
1309         ++i;
1310         dynamic [i].d_tag = DT_RELASZ;
1311         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_size;
1312         ++i;
1313         dynamic [i].d_tag = DT_RELAENT;
1314         dynamic [i].d_un.d_val = sizeof (ElfRelocA);
1315         ++i;
1316 #else
1317         dynamic [i].d_tag = DT_REL;
1318         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_offset;
1319         ++i;
1320         dynamic [i].d_tag = DT_RELSZ;
1321         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_size;
1322         ++i;
1323         dynamic [i].d_tag = DT_RELENT;
1324         dynamic [i].d_un.d_val = sizeof (ElfReloc);
1325         ++i;
1326 #endif
1327         dynamic [i].d_tag = DT_RELCOUNT;
1328         dynamic [i].d_un.d_val = acfg->num_relocs;
1329         ++i;
1330
1331         /* Program header */
1332         memset (&progh, 0, sizeof (progh));
1333         progh [0].p_type = PT_LOAD;
1334         progh [0].p_filesz = progh [0].p_memsz = secth [SECT_DYNAMIC].sh_offset;
1335         progh [0].p_align = 4096;
1336         progh [0].p_flags = 5;
1337
1338         progh [1].p_type = PT_LOAD;
1339         progh [1].p_offset = secth [SECT_DYNAMIC].sh_offset;
1340         progh [1].p_vaddr = progh [1].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1341         progh [1].p_filesz = secth [SECT_BSS].sh_offset  - secth [SECT_DYNAMIC].sh_offset;
1342         progh [1].p_memsz = secth [SECT_BSS].sh_addr + secth [SECT_BSS].sh_size - secth [SECT_DYNAMIC].sh_addr;
1343         progh [1].p_align = 4096;
1344         progh [1].p_flags = 6;
1345
1346         progh [2].p_type = PT_DYNAMIC;
1347         progh [2].p_offset = secth [SECT_DYNAMIC].sh_offset;
1348         progh [2].p_vaddr = progh [2].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1349         progh [2].p_filesz = progh [2].p_memsz = secth [SECT_DYNAMIC].sh_size;
1350         progh [2].p_align = SIZEOF_VOID_P;
1351         progh [2].p_flags = 6;
1352
1353         /* Compute the addresses of the bin sections, so relocation can be done */
1354         for (i = 0; i < SECT_NUM; ++i) {
1355                 if (sections [i]) {
1356                         sections [i]->file_offset = secth [i].sh_offset;
1357                         sections [i]->virt_offset = secth [i].sh_addr;
1358                 }
1359         }
1360
1361         reloc_symbols (acfg, dynsym, secth, &dyn_str_table, TRUE);
1362         reloc_symbols (acfg, symtab, secth, &str_table, FALSE);
1363         relocs = resolve_relocations (acfg);
1364
1365         if (!acfg->fp) {
1366                 acfg->out_buf_size = file_offset + sizeof (secth);
1367                 acfg->out_buf = g_malloc (acfg->out_buf_size);
1368         }
1369
1370         bin_writer_fwrite (acfg, &header, sizeof (header), 1);
1371         bin_writer_fwrite (acfg, &progh, sizeof (progh), 1);
1372         bin_writer_fwrite (acfg, hash, sizeof (int) * (hash [0] + hash [1] + 2), 1);
1373         bin_writer_fwrite (acfg, dynsym, sizeof (ElfSymbol) * hash [1], 1);
1374         bin_writer_fwrite (acfg, dyn_str_table.data->str, dyn_str_table.data->len, 1);
1375         /* .rel.dyn */
1376         bin_writer_fseek (acfg, secth [SECT_REL_DYN].sh_offset);
1377         bin_writer_fwrite (acfg, relocs, sizeof (ElfReloc), acfg->num_relocs);
1378
1379         /* .rela.dyn */
1380         bin_writer_fseek (acfg, secth [SECT_RELA_DYN].sh_offset);
1381         bin_writer_fwrite (acfg, relocs, secth [SECT_RELA_DYN].sh_size, 1);
1382
1383         /* .text */
1384         if (sections [SECT_TEXT]) {
1385                 bin_writer_fseek (acfg, secth [SECT_TEXT].sh_offset);
1386                 bin_writer_fwrite (acfg, sections [SECT_TEXT]->data, sections [SECT_TEXT]->cur_offset, 1);
1387         }
1388         /* .dynamic */
1389         bin_writer_fwrite (acfg, dynamic, sizeof (dynamic), 1);
1390
1391         /* .got.plt */
1392         size = secth [SECT_DYNAMIC].sh_addr;
1393         bin_writer_fwrite (acfg, &size, sizeof (size), 1);
1394
1395         /* normal sections */
1396         for (i = 0; i < sizeof (normal_sections) / sizeof (normal_sections [0]); ++i) {
1397                 int sect = normal_sections [i];
1398                 if (sections [sect]) {
1399                         bin_writer_fseek (acfg, secth [sect].sh_offset);
1400                         bin_writer_fwrite (acfg, sections [sect]->data, sections [sect]->cur_offset, 1);
1401                 }
1402         }
1403
1404         bin_writer_fseek (acfg, secth [SECT_SHSTRTAB].sh_offset);
1405         bin_writer_fwrite (acfg, sh_str_table.data->str, sh_str_table.data->len, 1);
1406         bin_writer_fseek (acfg, secth [SECT_SYMTAB].sh_offset);
1407         bin_writer_fwrite (acfg, symtab, sizeof (ElfSymbol) * num_local_syms, 1);
1408         bin_writer_fseek (acfg, secth [SECT_STRTAB].sh_offset);
1409         bin_writer_fwrite (acfg, str_table.data->str, str_table.data->len, 1);
1410         /*g_print ("file_offset %d vs %d\n", file_offset, ftell (file));*/
1411         /*g_assert (file_offset >= ftell (file));*/
1412         bin_writer_fseek (acfg, file_offset);
1413         bin_writer_fwrite (acfg, &secth, sizeof (secth), 1);
1414
1415         if (acfg->fp)
1416                 fclose (acfg->fp);
1417
1418         return 0;
1419 }
1420
1421 #endif /* USE_ELF_WRITER */
1422
1423 #endif /* USE_BIN_WRITER */
1424
1425 /* ASM WRITER */
1426
1427 static void
1428 asm_writer_emit_start (MonoImageWriter *acfg)
1429 {
1430 }
1431
1432 static int
1433 asm_writer_emit_writeout (MonoImageWriter *acfg)
1434 {
1435         fclose (acfg->fp);
1436
1437         return 0;
1438 }
1439
1440 static void
1441 asm_writer_emit_unset_mode (MonoImageWriter *acfg)
1442 {
1443         if (acfg->mode == EMIT_NONE)
1444                 return;
1445         fprintf (acfg->fp, "\n");
1446         acfg->mode = EMIT_NONE;
1447 }
1448
1449 static void
1450 asm_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1451 {
1452         asm_writer_emit_unset_mode (acfg);
1453 #if defined(TARGET_ASM_APPLE)
1454         if (strcmp(section_name, ".bss") == 0)
1455                 fprintf (acfg->fp, "%s\n", ".data");
1456         else if (strstr (section_name, ".debug") == section_name) {
1457                 //g_assert (subsection_index == 0);
1458                 fprintf (acfg->fp, ".section __DWARF, __%s,regular,debug\n", section_name + 1);
1459         } else
1460                 fprintf (acfg->fp, "%s\n", section_name);
1461 #elif defined(TARGET_ARM) || defined(TARGET_POWERPC)
1462         /* ARM gas doesn't seem to like subsections of .bss */
1463         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data")) {
1464                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1465         } else {
1466                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1467                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1468         }
1469 #elif defined(HOST_WIN32)
1470         fprintf (acfg->fp, ".section %s\n", section_name);
1471 #else
1472         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data") || !strcmp (section_name, ".bss")) {
1473                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1474         } else {
1475                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1476                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1477         }
1478 #endif
1479 }
1480
1481 static inline
1482 const char *get_label (const char *s)
1483 {
1484 #ifdef TARGET_ASM_APPLE
1485         if (s [0] == '.' && s [1] == 'L')
1486                 /* apple uses "L" instead of ".L" to mark temporary labels */
1487                 s ++;
1488 #endif
1489         return s;
1490 }
1491
1492 static void
1493 asm_writer_emit_symbol_type (MonoImageWriter *acfg, const char *name, gboolean func)
1494 {
1495         const char *stype;
1496
1497         if (func)
1498                 stype = "function";
1499         else
1500                 stype = "object";
1501
1502         asm_writer_emit_unset_mode (acfg);
1503 #if defined(TARGET_ASM_APPLE)
1504
1505 #elif defined(TARGET_ARM)
1506         fprintf (acfg->fp, "\t.type %s,#%s\n", name, stype);
1507 #else
1508         fprintf (acfg->fp, "\t.type %s,@%s\n", name, stype);
1509 #endif
1510 }
1511
1512 static void
1513 asm_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1514 {
1515         asm_writer_emit_unset_mode (acfg);
1516 #if  (defined(__ppc__) && defined(TARGET_ASM_APPLE)) || (defined(HOST_WIN32) && !defined(MONO_CROSS_COMPILE))
1517     // mach-o always uses a '_' prefix.
1518         fprintf (acfg->fp, "\t.globl _%s\n", name);
1519 #else
1520         fprintf (acfg->fp, "\t.globl %s\n", name);
1521 #endif
1522
1523         asm_writer_emit_symbol_type (acfg, name, func);
1524 }
1525
1526 static void
1527 asm_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1528 {
1529         asm_writer_emit_unset_mode (acfg);
1530
1531 #ifndef TARGET_ASM_APPLE
1532         fprintf (acfg->fp, "\t.local %s\n", name);
1533 #endif
1534
1535         asm_writer_emit_symbol_type (acfg, name, func);
1536 }
1537
1538 static void
1539 asm_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1540 {
1541         asm_writer_emit_unset_mode (acfg);
1542
1543 #ifndef TARGET_ASM_APPLE
1544         fprintf (acfg->fp, "\t.size %s,%s-%s\n", name, end_label, name);
1545 #endif
1546 }
1547
1548 static void
1549 asm_writer_emit_label (MonoImageWriter *acfg, const char *name)
1550 {
1551         asm_writer_emit_unset_mode (acfg);
1552 #if defined(HOST_WIN32) && (defined(TARGET_X86) || defined(TARGET_AMD64))
1553         fprintf (acfg->fp, "_%s:\n", name);
1554 #if defined(HOST_WIN32)
1555         /* Emit a normal label too */
1556         fprintf (acfg->fp, "%s:\n", name);
1557 #endif
1558 #else
1559         fprintf (acfg->fp, "%s:\n", get_label (name));
1560 #endif
1561
1562 }
1563
1564 static void
1565 asm_writer_emit_string (MonoImageWriter *acfg, const char *value)
1566 {
1567         asm_writer_emit_unset_mode (acfg);
1568         fprintf (acfg->fp, "\t%s \"%s\"\n", AS_STRING_DIRECTIVE, value);
1569 }
1570
1571 static void
1572 asm_writer_emit_line (MonoImageWriter *acfg)
1573 {
1574         asm_writer_emit_unset_mode (acfg);
1575         fprintf (acfg->fp, "\n");
1576 }
1577
1578 static void
1579 asm_writer_emit_alignment (MonoImageWriter *acfg, int size)
1580 {
1581         asm_writer_emit_unset_mode (acfg);
1582 #if defined(TARGET_ARM)
1583         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1584 #elif defined(__ppc__) && defined(TARGET_ASM_APPLE)
1585         // the mach-o assembler specifies alignments as powers of 2.
1586         fprintf (acfg->fp, "\t.align %d\t; ilog2\n", ilog2(size));
1587 #elif defined(TARGET_ASM_GAS)
1588         fprintf (acfg->fp, "\t.balign %d\n", size);
1589 #else
1590         fprintf (acfg->fp, "\t.align %d\n", size);
1591 #endif
1592 }
1593
1594 static void
1595 asm_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1596 {
1597         asm_writer_emit_unset_mode (acfg);
1598         fprintf (acfg->fp, "\t%s %s\n", AS_POINTER_DIRECTIVE, target ? target : "0");
1599 }
1600
1601 static void
1602 asm_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1603 {
1604         asm_writer_emit_unset_mode (acfg);
1605         asm_writer_emit_alignment (acfg, sizeof (gpointer));
1606         asm_writer_emit_pointer_unaligned (acfg, target);
1607 }
1608
1609 static char *byte_to_str;
1610
1611 static void
1612 asm_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1613 {
1614         int i;
1615         if (acfg->mode != EMIT_BYTE) {
1616                 acfg->mode = EMIT_BYTE;
1617                 acfg->col_count = 0;
1618         }
1619
1620         if (byte_to_str == NULL) {
1621                 byte_to_str = g_new0 (char, 256 * 8);
1622                 for (i = 0; i < 256; ++i) {
1623                         sprintf (byte_to_str + (i * 8), ",%d", i);
1624                 }
1625         }
1626
1627         for (i = 0; i < size; ++i, ++acfg->col_count) {
1628                 if ((acfg->col_count % 32) == 0)
1629                         fprintf (acfg->fp, "\n\t.byte %d", buf [i]);
1630                 else
1631                         fputs (byte_to_str + (buf [i] * 8), acfg->fp);
1632         }
1633 }
1634
1635 static inline void
1636 asm_writer_emit_int16 (MonoImageWriter *acfg, int value)
1637 {
1638         if (acfg->mode != EMIT_WORD) {
1639                 acfg->mode = EMIT_WORD;
1640                 acfg->col_count = 0;
1641         }
1642         if ((acfg->col_count++ % 8) == 0)
1643                 fprintf (acfg->fp, "\n\t%s ", AS_INT16_DIRECTIVE);
1644         else
1645                 fprintf (acfg->fp, ", ");
1646         fprintf (acfg->fp, "%d", value);
1647 }
1648
1649 static inline void
1650 asm_writer_emit_int32 (MonoImageWriter *acfg, int value)
1651 {
1652         if (acfg->mode != EMIT_LONG) {
1653                 acfg->mode = EMIT_LONG;
1654                 acfg->col_count = 0;
1655         }
1656         if ((acfg->col_count++ % 8) == 0)
1657                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1658         else
1659                 fprintf (acfg->fp, ",");
1660         fprintf (acfg->fp, "%d", value);
1661 }
1662
1663 static void
1664 asm_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1665 {
1666 #ifdef TARGET_ASM_APPLE
1667         char symbol [128];
1668 #endif
1669
1670         if (acfg->mode != EMIT_LONG) {
1671                 acfg->mode = EMIT_LONG;
1672                 acfg->col_count = 0;
1673         }
1674
1675         // FIXME: This doesn't seem to work on the iphone
1676 #if 0
1677         //#ifdef TARGET_ASM_APPLE
1678         /* The apple assembler needs a separate symbol to be able to handle complex expressions */
1679         sprintf (symbol, "LTMP_SYM%d", acfg->label_gen);
1680         start = get_label (start);
1681         end = get_label (end);
1682         acfg->label_gen ++;
1683         if (offset > 0)
1684                 fprintf (acfg->fp, "\n%s=%s - %s + %d", symbol, end, start, offset);
1685         else if (offset < 0)
1686                 fprintf (acfg->fp, "\n%s=%s - %s %d", symbol, end, start, offset);
1687         else
1688                 fprintf (acfg->fp, "\n%s=%s - %s", symbol, end, start);
1689
1690         fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1691         fprintf (acfg->fp, "%s", symbol);
1692 #else
1693         start = get_label (start);
1694         end = get_label (end);
1695         if ((acfg->col_count++ % 8) == 0)
1696                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1697         else
1698                 fprintf (acfg->fp, ",");
1699         if (offset > 0)
1700                 fprintf (acfg->fp, "%s - %s + %d", end, start, offset);
1701         else if (offset < 0)
1702                 fprintf (acfg->fp, "%s - %s %d", end, start, offset);
1703         else
1704                 fprintf (acfg->fp, "%s - %s", end, start);
1705 #endif
1706 }
1707
1708 static void
1709 asm_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1710 {
1711         asm_writer_emit_unset_mode (acfg);
1712         fprintf (acfg->fp, "\t%s %d\n", AS_SKIP_DIRECTIVE, num);
1713 }
1714
1715 /* EMIT FUNCTIONS */
1716
1717 void
1718 img_writer_emit_start (MonoImageWriter *acfg)
1719 {
1720 #ifdef USE_BIN_WRITER
1721         if (acfg->use_bin_writer)
1722                 bin_writer_emit_start (acfg);
1723         else
1724                 asm_writer_emit_start (acfg);
1725 #else
1726         asm_writer_emit_start (acfg);
1727 #endif
1728 }
1729
1730 void
1731 img_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1732 {
1733 #ifdef USE_BIN_WRITER
1734         if (acfg->use_bin_writer)
1735                 bin_writer_emit_section_change (acfg, section_name, subsection_index);
1736         else
1737                 asm_writer_emit_section_change (acfg, section_name, subsection_index);
1738 #else
1739         asm_writer_emit_section_change (acfg, section_name, subsection_index);
1740 #endif
1741
1742         acfg->current_section = section_name;
1743         acfg->current_subsection = subsection_index;
1744 }
1745
1746 void
1747 img_writer_emit_push_section (MonoImageWriter *acfg, const char *section_name, int subsection)
1748 {
1749         g_assert (acfg->stack_pos < 16 - 1);
1750         acfg->section_stack [acfg->stack_pos] = acfg->current_section;
1751         acfg->subsection_stack [acfg->stack_pos] = acfg->current_subsection;
1752         acfg->stack_pos ++;
1753
1754         img_writer_emit_section_change (acfg, section_name, subsection);
1755 }
1756
1757 void
1758 img_writer_emit_pop_section (MonoImageWriter *acfg)
1759 {
1760         g_assert (acfg->stack_pos > 0);
1761         acfg->stack_pos --;
1762         img_writer_emit_section_change (acfg, acfg->section_stack [acfg->stack_pos], acfg->subsection_stack [acfg->stack_pos]);
1763 }
1764
1765 void
1766 img_writer_set_section_addr (MonoImageWriter *acfg, guint64 addr)
1767 {
1768 #ifdef USE_BIN_WRITER
1769         if (!acfg->use_bin_writer)
1770                 NOT_IMPLEMENTED;
1771         else
1772                 bin_writer_set_section_addr (acfg, addr);
1773 #else
1774         NOT_IMPLEMENTED;
1775 #endif
1776 }
1777
1778 void
1779 img_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1780 {
1781 #ifdef USE_BIN_WRITER
1782         if (acfg->use_bin_writer)
1783                 bin_writer_emit_global (acfg, name, func);
1784         else
1785                 asm_writer_emit_global (acfg, name, func);
1786 #else
1787         asm_writer_emit_global (acfg, name, func);
1788 #endif
1789 }
1790
1791 void
1792 img_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1793 {
1794 #ifdef USE_BIN_WRITER
1795         if (acfg->use_bin_writer)
1796                 bin_writer_emit_local_symbol (acfg, name, end_label, func);
1797         else
1798                 asm_writer_emit_local_symbol (acfg, name, end_label, func);
1799 #else
1800         asm_writer_emit_local_symbol (acfg, name, end_label, func);
1801 #endif
1802 }
1803
1804 void
1805 img_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1806 {
1807         if (!acfg->use_bin_writer)
1808                 asm_writer_emit_symbol_size (acfg, name, end_label);
1809 }
1810
1811 void
1812 img_writer_emit_label (MonoImageWriter *acfg, const char *name)
1813 {
1814 #ifdef USE_BIN_WRITER
1815         if (acfg->use_bin_writer)
1816                 bin_writer_emit_label (acfg, name);
1817         else
1818                 asm_writer_emit_label (acfg, name);
1819 #else
1820         asm_writer_emit_label (acfg, name);
1821 #endif
1822 }
1823
1824 void
1825 img_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1826 {
1827 #ifdef USE_BIN_WRITER
1828         if (acfg->use_bin_writer)
1829                 bin_writer_emit_bytes (acfg, buf, size);
1830         else
1831                 asm_writer_emit_bytes (acfg, buf, size);
1832 #else
1833         asm_writer_emit_bytes (acfg, buf, size);
1834 #endif
1835 }
1836
1837 void
1838 img_writer_emit_string (MonoImageWriter *acfg, const char *value)
1839 {
1840 #ifdef USE_BIN_WRITER
1841         if (acfg->use_bin_writer)
1842                 bin_writer_emit_string (acfg, value);
1843         else
1844                 asm_writer_emit_string (acfg, value);
1845 #else
1846         asm_writer_emit_string (acfg, value);
1847 #endif
1848 }
1849
1850 void
1851 img_writer_emit_line (MonoImageWriter *acfg)
1852 {
1853 #ifdef USE_BIN_WRITER
1854         if (acfg->use_bin_writer)
1855                 bin_writer_emit_line (acfg);
1856         else
1857                 asm_writer_emit_line (acfg);
1858 #else
1859                 asm_writer_emit_line (acfg);
1860 #endif
1861 }
1862
1863 void
1864 img_writer_emit_alignment (MonoImageWriter *acfg, int size)
1865 {
1866 #ifdef USE_BIN_WRITER
1867         if (acfg->use_bin_writer)
1868                 bin_writer_emit_alignment (acfg, size);
1869         else
1870                 asm_writer_emit_alignment (acfg, size);
1871 #else
1872         asm_writer_emit_alignment (acfg, size);
1873 #endif
1874 }
1875
1876 void
1877 img_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1878 {
1879 #ifdef USE_BIN_WRITER
1880         if (acfg->use_bin_writer)
1881                 bin_writer_emit_pointer_unaligned (acfg, target);
1882         else
1883                 asm_writer_emit_pointer_unaligned (acfg, target);
1884 #else
1885         asm_writer_emit_pointer_unaligned (acfg, target);
1886 #endif
1887 }
1888
1889 void
1890 img_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1891 {
1892 #ifdef USE_BIN_WRITER
1893         if (acfg->use_bin_writer)
1894                 bin_writer_emit_pointer (acfg, target);
1895         else
1896                 asm_writer_emit_pointer (acfg, target);
1897 #else
1898         asm_writer_emit_pointer (acfg, target);
1899 #endif
1900 }
1901
1902 void
1903 img_writer_emit_int16 (MonoImageWriter *acfg, int value)
1904 {
1905 #ifdef USE_BIN_WRITER
1906         if (acfg->use_bin_writer)
1907                 bin_writer_emit_int16 (acfg, value);
1908         else
1909                 asm_writer_emit_int16 (acfg, value);
1910 #else
1911         asm_writer_emit_int16 (acfg, value);
1912 #endif
1913 }
1914
1915 void
1916 img_writer_emit_int32 (MonoImageWriter *acfg, int value)
1917 {
1918 #ifdef USE_BIN_WRITER
1919         if (acfg->use_bin_writer)
1920                 bin_writer_emit_int32 (acfg, value);
1921         else
1922                 asm_writer_emit_int32 (acfg, value);
1923 #else
1924         asm_writer_emit_int32 (acfg, value);
1925 #endif
1926 }
1927
1928 void
1929 img_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1930 {
1931 #ifdef USE_BIN_WRITER
1932         if (acfg->use_bin_writer)
1933                 bin_writer_emit_symbol_diff (acfg, end, start, offset);
1934         else
1935                 asm_writer_emit_symbol_diff (acfg, end, start, offset);
1936 #else
1937         asm_writer_emit_symbol_diff (acfg, end, start, offset);
1938 #endif
1939 }
1940
1941 void
1942 img_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1943 {
1944 #ifdef USE_BIN_WRITER
1945         if (acfg->use_bin_writer)
1946                 bin_writer_emit_zero_bytes (acfg, num);
1947         else
1948                 asm_writer_emit_zero_bytes (acfg, num);
1949 #else
1950         asm_writer_emit_zero_bytes (acfg, num);
1951 #endif
1952 }
1953
1954 int
1955 img_writer_emit_writeout (MonoImageWriter *acfg)
1956 {
1957 #ifdef USE_BIN_WRITER
1958         if (acfg->use_bin_writer)
1959                 return bin_writer_emit_writeout (acfg);
1960         else
1961                 return asm_writer_emit_writeout (acfg);
1962 #else
1963                 return asm_writer_emit_writeout (acfg);
1964 #endif
1965 }
1966
1967 void
1968 img_writer_emit_byte (MonoImageWriter *acfg, guint8 val)
1969 {
1970         img_writer_emit_bytes (acfg, &val, 1);
1971 }
1972
1973 /*
1974  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
1975  * Do not advance PC.
1976  */
1977 void
1978 img_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
1979 {
1980         /* This is only supported by the bin writer */
1981 #ifdef USE_BIN_WRITER
1982         if (acfg->use_bin_writer)
1983                 bin_writer_emit_reloc (acfg, reloc_type, symbol, addend);
1984         else
1985                 g_assert_not_reached ();
1986 #else
1987                 g_assert_not_reached ();
1988 #endif
1989 }
1990
1991 /*
1992  * img_writer_emit_unset_mode:
1993  *
1994  *   Flush buffered data so it is safe to write to the output file from outside this
1995  * module. This is a nop for the binary writer.
1996  */
1997 void
1998 img_writer_emit_unset_mode (MonoImageWriter *acfg)
1999 {
2000         if (!acfg->use_bin_writer)
2001                 asm_writer_emit_unset_mode (acfg);
2002 }
2003
2004 /*
2005  * img_writer_get_output:
2006  *
2007  *   Return the output buffer of a binary writer emitting to memory. The returned memory
2008  * is from malloc, and it is owned by the caller.
2009  */
2010 guint8*
2011 img_writer_get_output (MonoImageWriter *acfg, guint32 *size)
2012 {
2013 #ifdef USE_BIN_WRITER
2014         guint8 *buf;
2015
2016         g_assert (acfg->use_bin_writer);
2017
2018         buf = acfg->out_buf;
2019         *size = acfg->out_buf_size;
2020         acfg->out_buf = NULL;
2021         return buf;
2022 #else
2023         g_assert_not_reached ();
2024         return NULL;
2025 #endif
2026 }
2027
2028 /*
2029  * Return whenever the binary writer is supported on this platform.
2030  */
2031 gboolean
2032 bin_writer_supported (void)
2033 {
2034 #ifdef USE_BIN_WRITER
2035         return TRUE;
2036 #else
2037         return FALSE;
2038 #endif
2039 }
2040
2041 /*
2042  * img_writer_create:
2043  *
2044  *   Create an image writer writing to FP. If USE_BIN_WRITER is TRUE, FP can be NULL,
2045  * in this case the image writer will write to a memory buffer obtainable by calling
2046  * img_writer_get_output ().
2047  */
2048 MonoImageWriter*
2049 img_writer_create (FILE *fp, gboolean use_bin_writer)
2050 {
2051         MonoImageWriter *w = g_new0 (MonoImageWriter, 1);
2052
2053 #ifndef USE_BIN_WRITER
2054         g_assert (!use_bin_writer);
2055 #endif
2056
2057         if (!use_bin_writer)
2058                 g_assert (fp);
2059
2060         w->fp = fp;
2061         w->use_bin_writer = use_bin_writer;
2062         w->mempool = mono_mempool_new ();
2063
2064         return w;
2065 }
2066
2067 void
2068 img_writer_destroy (MonoImageWriter *w)
2069 {
2070         // FIXME: Free all the stuff
2071         mono_mempool_destroy (w->mempool);
2072         g_free (w);
2073 }
2074
2075 gboolean
2076 img_writer_subsections_supported (MonoImageWriter *acfg)
2077 {
2078 #ifdef TARGET_ASM_APPLE
2079         return acfg->use_bin_writer;
2080 #else
2081         return TRUE;
2082 #endif
2083 }
2084
2085 FILE *
2086 img_writer_get_fp (MonoImageWriter *acfg)
2087 {
2088         return acfg->fp;
2089 }
2090
2091 const char *
2092 img_writer_get_temp_label_prefix (MonoImageWriter *acfg)
2093 {
2094 #ifdef TARGET_ASM_APPLE
2095         return "L";
2096 #else
2097         return ".L";
2098 #endif
2099 }