mono/mini/image-writer.c

   1 /**
   2  * \file
   3  * Creation of object files or assembly files using the same interface.
   4  *
   5  * Author:
   6  *   Dietmar Maurer (dietmar@ximian.com)
   7  *   Zoltan Varga (vargaz@gmail.com)
   8  *   Paolo Molaro (lupus@ximian.com)
   9  *   Johan Lorensson (lateralusx.github@gmail.com)
  10  *
  11  * (C) 2002 Ximian, Inc.
  12  */
  13
  14 #include "config.h"
  15 #include <sys/types.h>
  16 #ifdef HAVE_UNISTD_H
  17 #include <unistd.h>
  18 #endif
  19 #ifdef HAVE_STDINT_H
  20 #include <stdint.h>
  21 #endif
  22 #include <fcntl.h>
  23 #include <ctype.h>
  24 #include <string.h>
  25 #ifndef HOST_WIN32
  26 #include <sys/time.h>
  27 #else
  28 #include <winsock2.h>
  29 #include <windows.h>
  30 #endif
  31
  32 #include <errno.h>
  33 #include <sys/stat.h>
  34 #include <limits.h>    /* for PAGESIZE */
  35 #ifndef PAGESIZE
  36 #define PAGESIZE 4096
  37 #endif
  38
  39 #include "image-writer.h"
  40
  41 #ifndef HOST_WIN32
  42 #include <mono/utils/freebsd-elf32.h>
  43 #include <mono/utils/freebsd-elf64.h>
  44 #endif
  45
  46 #include "mini.h"
  47
  48 #define TV_DECLARE(name) gint64 name
  49 #define TV_GETTIME(tv) tv = mono_100ns_ticks ()
  50 #define TV_ELAPSED(start,end) (((end) - (start)) / 10)
  51
  52 /*
  53  * The used assembler dialect
  54  * TARGET_ASM_APPLE == apple assembler on OSX
  55  * TARGET_ASM_GAS == GNU assembler
  56  */
  57 #if !defined(TARGET_ASM_APPLE) && !defined(TARGET_ASM_GAS)
  58 #if defined(TARGET_MACH)
  59 #define TARGET_ASM_APPLE
  60 #else
  61 #define TARGET_ASM_GAS
  62 #endif
  63 #endif
  64
  65 /*
  66  * Defines for the directives used by different assemblers
  67  */
  68 #if defined(TARGET_POWERPC) || defined(TARGET_MACH)
  69 #define AS_STRING_DIRECTIVE ".asciz"
  70 #else
  71 #define AS_STRING_DIRECTIVE ".string"
  72 #endif
  73
  74 #define AS_INT32_DIRECTIVE ".long"
  75 #define AS_INT64_DIRECTIVE ".quad"
  76
  77 #if (defined(TARGET_AMD64) || defined(TARGET_POWERPC64)) && !defined(__mono_ilp32__)
  78 #define AS_POINTER_DIRECTIVE ".quad"
  79 #elif defined(TARGET_ARM64)
  80
  81 #ifdef TARGET_ASM_APPLE
  82 #define AS_POINTER_DIRECTIVE ".quad"
  83 #else
  84 #define AS_POINTER_DIRECTIVE ".xword"
  85 #endif
  86
  87 #else
  88 #define AS_POINTER_DIRECTIVE ".long"
  89 #endif
  90
  91 #if defined(TARGET_ASM_APPLE)
  92 #define AS_INT16_DIRECTIVE ".short"
  93 #elif defined(TARGET_ASM_GAS) && defined(TARGET_WIN32)
  94 #define AS_INT16_DIRECTIVE ".word"
  95 #elif defined(TARGET_ASM_GAS)
  96 #define AS_INT16_DIRECTIVE ".hword"
  97 #else
  98 #define AS_INT16_DIRECTIVE ".word"
  99 #endif
 100
 101 #if defined(TARGET_ASM_APPLE)
 102 #define AS_SKIP_DIRECTIVE ".space"
 103 #else
 104 #define AS_SKIP_DIRECTIVE ".skip"
 105 #endif
 106
 107 #if defined(TARGET_ASM_APPLE)
 108 #define AS_GLOBAL_PREFIX "_"
 109 #else
 110 #define AS_GLOBAL_PREFIX ""
 111 #endif
 112
 113 #ifdef TARGET_ASM_APPLE
 114 #define AS_TEMP_LABEL_PREFIX "L"
 115 #else
 116 #define AS_TEMP_LABEL_PREFIX ".L"
 117 #endif
 118
 119 #define ROUND_DOWN(VALUE,SIZE)  ((VALUE) & ~((SIZE) - 1))
 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 = (guint8 *)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                 acfg->cur_section->cur_offset += sizeof (gpointer);
 354                 return;
 355         }
 356
 357         reloc = g_new0 (BinReloc, 1);
 358         reloc->val1 = g_strdup (target);
 359         reloc->section = acfg->cur_section;
 360         reloc->section_offset = acfg->cur_section->cur_offset;
 361         reloc->next = acfg->relocations;
 362         acfg->relocations = reloc;
 363         if (strcmp (reloc->section->name, ".data") == 0) {
 364                 acfg->num_relocs++;
 365                 //g_print ("reloc: %s at %d\n", target, acfg->cur_section->cur_offset);
 366         }
 367         acfg->cur_section->cur_offset += sizeof (gpointer);
 368 }
 369
 370 static void
 371 bin_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
 372 {
 373         bin_writer_emit_alignment (acfg, sizeof (gpointer));
 374         bin_writer_emit_pointer_unaligned (acfg, target);
 375 }
 376
 377 static void
 378 bin_writer_emit_int16 (MonoImageWriter *acfg, int value)
 379 {
 380         guint8 *data;
 381         bin_writer_emit_ensure_buffer (acfg->cur_section, 2);
 382         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 383         acfg->cur_section->cur_offset += 2;
 384         /* FIXME: little endian */
 385         data [0] = value;
 386         data [1] = value >> 8;
 387 }
 388
 389 static void
 390 bin_writer_emit_int32 (MonoImageWriter *acfg, int value)
 391 {
 392         guint8 *data;
 393         bin_writer_emit_ensure_buffer (acfg->cur_section, 4);
 394         data = acfg->cur_section->data + acfg->cur_section->cur_offset;
 395         acfg->cur_section->cur_offset += 4;
 396         /* FIXME: little endian */
 397         data [0] = value;
 398         data [1] = value >> 8;
 399         data [2] = value >> 16;
 400         data [3] = value >> 24;
 401 }
 402
 403 static BinReloc*
 404 create_reloc (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 405 {
 406         BinReloc *reloc;
 407         reloc = (BinReloc *)mono_mempool_alloc0 (acfg->mempool, sizeof (BinReloc));
 408         reloc->val1 = mono_mempool_strdup (acfg->mempool, end);
 409         if (strcmp (start, ".") == 0) {
 410                 reloc->val2_section = acfg->cur_section;
 411                 reloc->val2_offset = acfg->cur_section->cur_offset;
 412         } else {
 413                 reloc->val2 = mono_mempool_strdup (acfg->mempool, start);
 414         }
 415         reloc->offset = offset;
 416         reloc->section = acfg->cur_section;
 417         reloc->section_offset = acfg->cur_section->cur_offset;
 418         reloc->next = acfg->relocations;
 419         acfg->relocations = reloc;
 420         return reloc;
 421 }
 422
 423 static void
 424 bin_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
 425 {
 426         create_reloc (acfg, end, start, offset);
 427         acfg->cur_section->cur_offset += 4;
 428         /*if (strcmp (reloc->section->name, ".data") == 0) {
 429                 acfg->num_relocs++;
 430                 g_print ("reloc: %s - %s + %d at %d\n", end, start, offset, acfg->cur_section->cur_offset - 4);
 431         }*/
 432 }
 433
 434 /*
 435  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
 436  * Do not advance PC.
 437  */
 438 static G_GNUC_UNUSED void
 439 bin_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
 440 {
 441         BinReloc *reloc = create_reloc (acfg, symbol, ".", addend);
 442         reloc->reloc_type = reloc_type;
 443 }
 444
 445 static void
 446 bin_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
 447 {
 448         bin_writer_emit_ensure_buffer (acfg->cur_section, num);
 449         acfg->cur_section->cur_offset += num;
 450 }
 451
 452 static void
 453 bin_writer_fwrite (MonoImageWriter *acfg, void *val, size_t size, size_t nmemb)
 454 {
 455         if (acfg->fp)
 456                 fwrite (val, size, nmemb, acfg->fp);
 457         else {
 458                 g_assert (acfg->out_buf_pos + (size * nmemb) <= acfg->out_buf_size);
 459                 memcpy (acfg->out_buf + acfg->out_buf_pos, val, size * nmemb);
 460                 acfg->out_buf_pos += (size * nmemb);
 461         }
 462 }
 463
 464 static void
 465 bin_writer_fseek (MonoImageWriter *acfg, int offset)
 466 {
 467         if (acfg->fp)
 468                 fseek (acfg->fp, offset, SEEK_SET);
 469         else
 470                 acfg->out_buf_pos = offset;
 471 }
 472
 473 #ifdef USE_MACH_WRITER
 474
 475 /*
 476  * This is a minimal implementation designed to support xdebug on 32 bit osx
 477  * FIXME: 64 bit support
 478  */
 479
 480 #include <mach-o/loader.h>
 481
 482 static gsize
 483 get_label_addr (MonoImageWriter *acfg, const char *name)
 484 {
 485         int offset;
 486         BinLabel *lab;
 487         BinSection *section;
 488         gsize value;
 489
 490         lab = g_hash_table_lookup (acfg->labels, name);
 491         if (!lab)
 492                 g_error ("Undefined label: '%s'.\n", name);
 493         section = lab->section;
 494         offset = lab->offset;
 495         if (section->parent) {
 496                 value = section->parent->virt_offset + section->cur_offset + offset;
 497         } else {
 498                 value = section->virt_offset + offset;
 499         }
 500         return value;
 501 }
 502
 503
 504 static void
 505 resolve_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 **out_data, gsize *out_vaddr, gsize *out_start_val, gsize *out_end_val)
 506 {
 507         guint8 *data;
 508         gssize end_val, start_val;
 509         gsize vaddr;
 510
 511         end_val = get_label_addr (acfg, reloc->val1);
 512         if (reloc->val2) {
 513                 start_val = get_label_addr (acfg, reloc->val2);
 514         } else if (reloc->val2_section) {
 515                 start_val = reloc->val2_offset;
 516                 if (reloc->val2_section->parent)
 517                         start_val += reloc->val2_section->parent->virt_offset + reloc->val2_section->cur_offset;
 518                 else
 519                         start_val += reloc->val2_section->virt_offset;
 520         } else {
 521                 start_val = 0;
 522         }
 523         end_val = end_val - start_val + reloc->offset;
 524         if (reloc->section->parent) {
 525                 data = reloc->section->parent->data;
 526                 data += reloc->section->cur_offset;
 527                 data += reloc->section_offset;
 528                 vaddr = reloc->section->parent->virt_offset;
 529                 vaddr += reloc->section->cur_offset;
 530                 vaddr += reloc->section_offset;
 531         } else {
 532                 data = reloc->section->data;
 533                 data += reloc->section_offset;
 534                 vaddr = reloc->section->virt_offset;
 535                 vaddr += reloc->section_offset;
 536         }
 537
 538         *out_start_val = start_val;
 539         *out_end_val = end_val;
 540         *out_data = data;
 541         *out_vaddr = vaddr;
 542 }
 543
 544 static void
 545 resolve_relocations (MonoImageWriter *acfg)
 546 {
 547         BinReloc *reloc;
 548         guint8 *data;
 549         gsize end_val, start_val;
 550         gsize vaddr;
 551
 552         /* Only resolve static relocations */
 553         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
 554                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
 555                 data [0] = end_val;
 556                 data [1] = end_val >> 8;
 557                 data [2] = end_val >> 16;
 558                 data [3] = end_val >> 24;
 559         }
 560 }
 561
 562 static int
 563 bin_writer_emit_writeout (MonoImageWriter *acfg)
 564 {
 565         BinSection *s;
 566         int sindex, file_size, nsections, file_offset, vmaddr;
 567         struct mach_header header;
 568         struct segment_command segment;
 569         struct section *sections;
 570
 571         /* Assing vm addresses to sections */
 572         nsections = 0;
 573         vmaddr = 0;
 574         for (s = acfg->sections; s; s = s->next) {
 575                 s->virt_offset = vmaddr;
 576                 vmaddr += s->cur_offset;
 577                 nsections ++;
 578         }
 579
 580         resolve_relocations (acfg);
 581
 582         file_offset = 0;
 583
 584         memset (&header, 0, sizeof (header));
 585         header.magic = MH_MAGIC;
 586         header.cputype = CPU_TYPE_X86;
 587         header.cpusubtype = CPU_SUBTYPE_X86_ALL;
 588         header.filetype = MH_OBJECT;
 589         header.ncmds = 0;
 590         header.sizeofcmds = 0;
 591         header.flags = 0;
 592
 593         file_offset += sizeof (header);
 594
 595         memset (&segment, 0, sizeof (segment));
 596         segment.cmd = LC_SEGMENT;
 597         segment.cmdsize = sizeof (segment);
 598         segment.maxprot = VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE;
 599         segment.initprot = VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE;
 600
 601         file_offset += sizeof (segment);
 602         file_offset += nsections * sizeof (struct section);
 603
 604         sections = g_new0 (struct section, nsections);
 605         sindex = 0;
 606         for (s = acfg->sections; s; s = s->next) {
 607                 s->file_offset = file_offset;
 608
 609                 /* .debug_line -> __debug_line */
 610                 sprintf (sections [sindex].sectname, "__%s", s->name + 1);
 611                 sprintf (sections [sindex].segname, "%s", "__DWARF");
 612                 sections [sindex].addr = s->virt_offset;
 613                 sections [sindex].size = s->cur_offset;
 614                 sections [sindex].offset = s->file_offset;
 615
 616                 file_offset += s->cur_offset;
 617
 618                 segment.nsects ++;
 619                 segment.cmdsize += sizeof (struct section);
 620
 621                 sindex ++;
 622         }
 623
 624         header.ncmds ++;
 625         header.sizeofcmds += segment.cmdsize;
 626
 627         /* Emit data */
 628         file_size = file_offset;
 629
 630         if (!acfg->fp) {
 631                 acfg->out_buf_size = file_size;
 632                 acfg->out_buf = g_malloc (acfg->out_buf_size);
 633         }
 634
 635         bin_writer_fwrite (acfg, &header, sizeof (header), 1);
 636         bin_writer_fwrite (acfg, &segment, sizeof (segment), 1);
 637         bin_writer_fwrite (acfg, sections, sizeof (struct section), nsections);
 638         for (s = acfg->sections; s; s = s->next) {
 639                 if (!acfg->fp)
 640                         g_assert (acfg->out_buf_pos == s->file_offset);
 641                 bin_writer_fwrite (acfg, s->data, s->cur_offset, 1);
 642         }
 643
 644         if (acfg->fp)
 645                 fclose (acfg->fp);
 646
 647         return 0;
 648 }
 649
 650 #endif
 651
 652 #ifdef USE_ELF_WRITER
 653
 654 enum {
 655         SECT_NULL,
 656         SECT_HASH,
 657         SECT_DYNSYM,
 658         SECT_DYNSTR,
 659         SECT_REL_DYN,
 660         SECT_RELA_DYN,
 661         SECT_TEXT,
 662         SECT_RODATA,
 663         SECT_DYNAMIC,
 664         SECT_GOT_PLT,
 665         SECT_DATA,
 666         SECT_BSS,
 667         SECT_DEBUG_FRAME,
 668         SECT_DEBUG_INFO,
 669         SECT_DEBUG_ABBREV,
 670         SECT_DEBUG_LINE,
 671         SECT_DEBUG_LOC,
 672         SECT_SHSTRTAB,
 673         SECT_SYMTAB,
 674         SECT_STRTAB,
 675         SECT_NUM
 676 };
 677
 678 #if TARGET_SIZEOF_VOID_P == 4
 679
 680 typedef Elf32_Ehdr ElfHeader;
 681 typedef Elf32_Shdr ElfSectHeader;
 682 typedef Elf32_Phdr ElfProgHeader;
 683 typedef Elf32_Sym ElfSymbol;
 684 typedef Elf32_Rel ElfReloc;
 685 typedef Elf32_Rela ElfRelocA;
 686 typedef Elf32_Dyn ElfDynamic;
 687
 688 #else
 689
 690 typedef Elf64_Ehdr ElfHeader;
 691 typedef Elf64_Shdr ElfSectHeader;
 692 typedef Elf64_Phdr ElfProgHeader;
 693 typedef Elf64_Sym ElfSymbol;
 694 typedef Elf64_Rel ElfReloc;
 695 typedef Elf64_Rela ElfRelocA;
 696 typedef Elf64_Dyn ElfDynamic;
 697
 698 #endif
 699
 700 typedef struct {
 701         const char *name;
 702         int type;
 703         int esize;
 704         int flags;
 705         int align;
 706 } SectInfo;
 707
 708 static SectInfo section_info [] = {
 709         {"", 0, 0, 0, 0},
 710         {".hash", SHT_HASH, 4, 2, TARGET_SIZEOF_VOID_P},
 711         {".dynsym", SHT_DYNSYM, sizeof (ElfSymbol), 2, TARGET_SIZEOF_VOID_P},
 712         {".dynstr", SHT_STRTAB, 0, 2, 1},
 713         {".rel.dyn", SHT_REL, sizeof (ElfReloc), 2, TARGET_SIZEOF_VOID_P},
 714         {".rela.dyn", SHT_RELA, sizeof (ElfRelocA), 2, TARGET_SIZEOF_VOID_P},
 715         {".text", SHT_PROGBITS, 0, 6, 4096},
 716         {".rodata", SHT_PROGBITS, 0, SHF_ALLOC, 4096},
 717         {".dynamic", SHT_DYNAMIC, sizeof (ElfDynamic), 3, TARGET_SIZEOF_VOID_P},
 718         {".got.plt", SHT_PROGBITS, TARGET_SIZEOF_VOID_P, 3, TARGET_SIZEOF_VOID_P},
 719         {".data", SHT_PROGBITS, 0, 3, 8},
 720         {".bss", SHT_NOBITS, 0, 3, 8},
 721         {".debug_frame", SHT_PROGBITS, 0, 0, 8},
 722         {".debug_info", SHT_PROGBITS, 0, 0, 1},
 723         {".debug_abbrev", SHT_PROGBITS, 0, 0, 1},
 724         {".debug_line", SHT_PROGBITS, 0, 0, 1},
 725         {".debug_loc", SHT_PROGBITS, 0, 0, 1},
 726         {".shstrtab", SHT_STRTAB, 0, 0, 1},
 727         {".symtab", SHT_SYMTAB, sizeof (ElfSymbol), 0, TARGET_SIZEOF_VOID_P},
 728         {".strtab", SHT_STRTAB, 0, 0, 1}
 729 };
 730
 731 typedef struct {
 732         GString *data;
 733         GHashTable *hash;
 734 } ElfStrTable;
 735
 736 static int
 737 str_table_add (ElfStrTable *table, const char* value)
 738 {
 739         int idx;
 740         if (!table->data) {
 741                 table->data = g_string_new_len ("", 1);
 742                 table->hash = g_hash_table_new (g_str_hash, g_str_equal);
 743         }
 744         idx = GPOINTER_TO_UINT (g_hash_table_lookup (table->hash, value));
 745         if (idx)
 746                 return idx;
 747         idx = table->data->len;
 748         g_string_append (table->data, value);
 749         g_string_append_c (table->data, 0);
 750         g_hash_table_insert (table->hash, (void*)value, GUINT_TO_POINTER (idx));
 751         return idx;
 752 }
 753
 754 static void
 755 append_subsection (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection *sect, BinSection *add)
 756 {
 757         int offset = sect->cur_offset;
 758         /*offset += (sheaders [sect->shidx].sh_addralign - 1);
 759         offset &= ~(sheaders [sect->shidx].sh_addralign - 1);*/
 760         /*
 761          * FIXME: we shouldn't align subsections at all, but if we don't then the
 762          * stuff inside the subsections which is aligned won't get aligned.
 763          */
 764         if (strcmp (sect->name, ".debug_line") != 0) {
 765                 offset += (8 - 1);
 766                 offset &= ~(8 - 1);
 767         }
 768         bin_writer_emit_ensure_buffer (sect, offset);
 769         //g_print ("section %s aligned to %d from %d\n", sect->name, offset, sect->cur_offset);
 770         sect->cur_offset = offset;
 771
 772         bin_writer_emit_ensure_buffer (sect, add->cur_offset);
 773         memcpy (sect->data + sect->cur_offset, add->data, add->cur_offset);
 774         add->parent = sect;
 775         sect->cur_offset += add->cur_offset;
 776         add->cur_offset = offset; /* it becomes the offset in the parent section */
 777         //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);
 778         add->data = NULL;
 779         add->data_len = 0;
 780 }
 781
 782 /* merge the subsections */
 783 static int
 784 collect_sections (MonoImageWriter *acfg, ElfSectHeader *sheaders, BinSection **out, int num)
 785 {
 786         int i, j, maxs, num_sections;
 787         BinSection *sect;
 788
 789         num_sections = 0;
 790         maxs = 0;
 791         for (sect = acfg->sections; sect; sect = sect->next) {
 792                 if (sect->subsection == 0) {
 793                         out [num_sections++] = sect;
 794                         g_assert (num_sections < num);
 795                 }
 796                 maxs = MAX (maxs, sect->subsection);
 797         }
 798         for (i = 0; i < num_sections; i++) {
 799                 for (j = 1; j <= maxs; ++j) {
 800                         for (sect = acfg->sections; sect; sect = sect->next) {
 801                                 if (sect->subsection == j && strcmp (out [i]->name, sect->name) == 0) {
 802                                         append_subsection (acfg, sheaders, out [i], sect);
 803                                 }
 804                         }
 805                 }
 806         }
 807         return num_sections;
 808 }
 809
 810 static unsigned long
 811 elf_hash (const unsigned char *name)
 812 {
 813         unsigned long h = 0, g;
 814         while (*name) {
 815                 h = (h << 4) + *name++;
 816                 if ((g = h & 0xf0000000))
 817                         h ^= g >> 24;
 818                 h &= ~g;
 819         }
 820         return h;
 821 }
 822
 823 #define NUM_BUCKETS 17
 824
 825 static int*
 826 build_hash (MonoImageWriter *acfg, int num_sections, ElfStrTable *dynstr)
 827 {
 828         int *data;
 829         int num_symbols = 1 + num_sections + 3;
 830         BinSymbol *symbol;
 831
 832         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 833                 if (!symbol->is_global)
 834                         continue;
 835                 num_symbols++;
 836                 str_table_add (dynstr, symbol->name);
 837                 /*g_print ("adding sym: %s\n", symbol->name);*/
 838         }
 839         str_table_add (dynstr, "__bss_start");
 840         str_table_add (dynstr, "_edata");
 841         str_table_add (dynstr, "_end");
 842
 843         data = g_new0 (int, num_symbols + 2 + NUM_BUCKETS);
 844         data [0] = NUM_BUCKETS;
 845         data [1] = num_symbols;
 846
 847         return data;
 848 }
 849
 850 static gsize
 851 get_label_addr (MonoImageWriter *acfg, const char *name)
 852 {
 853         int offset;
 854         BinLabel *lab;
 855         BinSection *section;
 856         gsize value;
 857
 858         lab = (BinLabel *)g_hash_table_lookup (acfg->labels, name);
 859         if (!lab)
 860                 g_error ("Undefined label: '%s'.\n", name);
 861         section = lab->section;
 862         offset = lab->offset;
 863         if (section->parent) {
 864                 value = section->parent->virt_offset + section->cur_offset + offset;
 865         } else {
 866                 value = section->virt_offset + offset;
 867         }
 868         return value;
 869 }
 870
 871 static ElfSymbol*
 872 collect_syms (MonoImageWriter *acfg, int *hash, ElfStrTable *strtab, ElfSectHeader *sheaders, int *num_syms)
 873 {
 874         ElfSymbol *symbols;
 875         BinSymbol *symbol;
 876         BinSection *section;
 877         int i;
 878         int *bucket;
 879         int *chain;
 880         unsigned long hashc;
 881
 882         if (hash)
 883                 symbols = g_new0 (ElfSymbol, hash [1]);
 884         else {
 885                 i = 0;
 886                 for (symbol = acfg->symbols; symbol; symbol = symbol->next)
 887                         i ++;
 888
 889                 symbols = g_new0 (ElfSymbol, i + SECT_NUM + 10); /* FIXME */
 890         }
 891
 892         /* the first symbol is undef, all zeroes */
 893         i = 1;
 894         if (sheaders) {
 895                 int j;
 896                 for (j = 1; j < SECT_NUM; ++j) {
 897                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 898                         symbols [i].st_shndx = j;
 899                         symbols [i].st_value = sheaders [j].sh_addr;
 900                         ++i;
 901                 }
 902         } else {
 903                 for (section = acfg->sections; section; section = section->next) {
 904                         if (section->parent)
 905                                 continue;
 906                         symbols [i].st_info = ELF32_ST_INFO (STB_LOCAL, STT_SECTION);
 907                         if (strcmp (section->name, ".text") == 0) {
 908                                 symbols [i].st_shndx = SECT_TEXT;
 909                                 section->shidx = SECT_TEXT;
 910                                 section->file_offset = 4096;
 911                                 symbols [i].st_value = section->virt_offset;
 912                         } else if (strcmp (section->name, ".rodata") == 0) {
 913                                 symbols [i].st_shndx = SECT_RODATA;
 914                                 section->shidx = SECT_RODATA;
 915                                 section->file_offset = 4096;
 916                                 symbols [i].st_value = section->virt_offset;
 917                         } else if (strcmp (section->name, ".data") == 0) {
 918                                 symbols [i].st_shndx = SECT_DATA;
 919                                 section->shidx = SECT_DATA;
 920                                 section->file_offset = 4096 + 28; /* FIXME */
 921                                 symbols [i].st_value = section->virt_offset;
 922                         } else if (strcmp (section->name, ".bss") == 0) {
 923                                 symbols [i].st_shndx = SECT_BSS;
 924                                 section->shidx = SECT_BSS;
 925                                 section->file_offset = 4096 + 28 + 8; /* FIXME */
 926                                 symbols [i].st_value = section->virt_offset;
 927                         }
 928                         ++i;
 929                 }
 930         }
 931         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
 932                 int offset;
 933                 BinLabel *lab;
 934                 if (!symbol->is_global && hash)
 935                         continue;
 936                 symbols [i].st_info = ELF32_ST_INFO (symbol->is_global ? STB_GLOBAL : STB_LOCAL, symbol->is_function? STT_FUNC : STT_OBJECT);
 937                 symbols [i].st_name = str_table_add (strtab, symbol->name);
 938                 /*g_print ("sym name %s tabled to %d\n", symbol->name, symbols [i].st_name);*/
 939                 section = symbol->section;
 940                 symbols [i].st_shndx = section->parent? section->parent->shidx: section->shidx;
 941                 lab = (BinLabel *)g_hash_table_lookup (acfg->labels, symbol->name);
 942                 offset = lab->offset;
 943                 if (section->parent) {
 944                         symbols [i].st_value = section->parent->virt_offset + section->cur_offset + offset;
 945                 } else {
 946                         symbols [i].st_value = section->virt_offset + offset;
 947                 }
 948
 949                 if (symbol->end_label) {
 950                         BinLabel *elab = (BinLabel *)g_hash_table_lookup (acfg->labels, symbol->end_label);
 951                         g_assert (elab);
 952                         symbols [i].st_size = elab->offset - lab->offset;
 953                 }
 954                 ++i;
 955         }
 956         /* add special symbols */
 957         symbols [i].st_name = str_table_add (strtab, "__bss_start");
 958         symbols [i].st_shndx = 0xfff1;
 959         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 960         ++i;
 961         symbols [i].st_name = str_table_add (strtab, "_edata");
 962         symbols [i].st_shndx = 0xfff1;
 963         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 964         ++i;
 965         symbols [i].st_name = str_table_add (strtab, "_end");
 966         symbols [i].st_shndx = 0xfff1;
 967         symbols [i].st_info = ELF32_ST_INFO (STB_GLOBAL, 0);
 968         ++i;
 969
 970         if (num_syms)
 971                 *num_syms = i;
 972
 973         /* add to hash table */
 974         if (hash) {
 975                 bucket = hash + 2;
 976                 chain = hash + 2 + hash [0];
 977                 for (i = 0; i < hash [1]; ++i) {
 978                         int slot;
 979                         /*g_print ("checking %d '%s' (sym %d)\n", symbols [i].st_name, strtab->data->str + symbols [i].st_name, i);*/
 980                         if (!symbols [i].st_name)
 981                                 continue;
 982                         hashc = elf_hash ((guint8*)strtab->data->str + symbols [i].st_name);
 983                         slot = hashc % hash [0];
 984                         /*g_print ("hashing '%s' at slot %d (sym %d)\n", strtab->data->str + symbols [i].st_name, slot, i);*/
 985                         if (bucket [slot]) {
 986                                 chain [i] = bucket [slot];
 987                                 bucket [slot] = i;
 988                         } else {
 989                                 bucket [slot] = i;
 990                         }
 991                 }
 992         }
 993         return symbols;
 994 }
 995
 996 static void
 997 reloc_symbols (MonoImageWriter *acfg, ElfSymbol *symbols, ElfSectHeader *sheaders, ElfStrTable *strtab, gboolean dynamic)
 998 {
 999         BinSection *section;
1000         BinSymbol *symbol;
1001         int i;
1002
1003         i = 1;
1004         if (dynamic) {
1005                 for (section = acfg->sections; section; section = section->next) {
1006                         if (section->parent)
1007                                 continue;
1008                         symbols [i].st_value = sheaders [section->shidx].sh_addr;
1009                         ++i;
1010                 }
1011         } else {
1012                 for (i = 1; i < SECT_NUM; ++i) {
1013                         symbols [i].st_value = sheaders [i].sh_addr;
1014                 }
1015         }
1016         for (symbol = acfg->symbols; symbol; symbol = symbol->next) {
1017                 int offset;
1018                 BinLabel *lab;
1019                 if (dynamic && !symbol->is_global)
1020                         continue;
1021                 section = symbol->section;
1022                 lab = (BinLabel *)g_hash_table_lookup (acfg->labels, symbol->name);
1023                 offset = lab->offset;
1024                 if (section->parent) {
1025                         symbols [i].st_value = sheaders [section->parent->shidx].sh_addr + section->cur_offset + offset;
1026                 } else {
1027                         symbols [i].st_value = sheaders [section->shidx].sh_addr + offset;
1028                 }
1029                 ++i;
1030         }
1031         /* __bss_start */
1032         symbols [i].st_value = sheaders [SECT_BSS].sh_addr;
1033         ++i;
1034         /* _edata */
1035         symbols [i].st_value = sheaders [SECT_DATA].sh_addr + sheaders [SECT_DATA].sh_size;
1036         ++i;
1037         /* _end */
1038         symbols [i].st_value = sheaders [SECT_BSS].sh_addr + sheaders [SECT_BSS].sh_size;
1039         ++i;
1040 }
1041
1042 static void
1043 resolve_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 **out_data, gsize *out_vaddr, gsize *out_start_val, gsize *out_end_val)
1044 {
1045         guint8 *data;
1046         gssize end_val, start_val;
1047         gsize vaddr;
1048
1049         end_val = get_label_addr (acfg, reloc->val1);
1050         if (reloc->val2) {
1051                 start_val = get_label_addr (acfg, reloc->val2);
1052         } else if (reloc->val2_section) {
1053                 start_val = reloc->val2_offset;
1054                 if (reloc->val2_section->parent)
1055                         start_val += reloc->val2_section->parent->virt_offset + reloc->val2_section->cur_offset;
1056                 else
1057                         start_val += reloc->val2_section->virt_offset;
1058         } else {
1059                 start_val = 0;
1060         }
1061         end_val = end_val - start_val + reloc->offset;
1062         if (reloc->section->parent) {
1063                 data = reloc->section->parent->data;
1064                 data += reloc->section->cur_offset;
1065                 data += reloc->section_offset;
1066                 vaddr = reloc->section->parent->virt_offset;
1067                 vaddr += reloc->section->cur_offset;
1068                 vaddr += reloc->section_offset;
1069         } else {
1070                 data = reloc->section->data;
1071                 data += reloc->section_offset;
1072                 vaddr = reloc->section->virt_offset;
1073                 vaddr += reloc->section_offset;
1074         }
1075
1076         *out_start_val = start_val;
1077         *out_end_val = end_val;
1078         *out_data = data;
1079         *out_vaddr = vaddr;
1080 }
1081
1082 #ifdef USE_ELF_RELA
1083
1084 static ElfRelocA*
1085 resolve_relocations (MonoImageWriter *acfg)
1086 {
1087         BinReloc *reloc;
1088         guint8 *data;
1089         gsize end_val, start_val;
1090         ElfRelocA *rr;
1091         int i;
1092         gsize vaddr;
1093
1094         rr = g_new0 (ElfRelocA, acfg->num_relocs);
1095         i = 0;
1096
1097         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
1098                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
1099                 /* FIXME: little endian */
1100                 data [0] = end_val;
1101                 data [1] = end_val >> 8;
1102                 data [2] = end_val >> 16;
1103                 data [3] = end_val >> 24;
1104                 // FIXME:
1105                 if (start_val == 0 && reloc->val1 [0] != '.') {
1106                         rr [i].r_offset = vaddr;
1107                         rr [i].r_info = R_X86_64_RELATIVE;
1108                         rr [i].r_addend = end_val;
1109                         ++i;
1110                         g_assert (i <= acfg->num_relocs);
1111                 }
1112         }
1113         return rr;
1114 }
1115
1116 #else /* USE_ELF_RELA */
1117
1118 static void
1119 do_reloc (MonoImageWriter *acfg, BinReloc *reloc, guint8 *data, gssize addr)
1120 {
1121 #ifdef TARGET_ARM
1122         /*
1123          * We use the official ARM relocation types, but implement only the stuff actually
1124          * needed by the code we generate.
1125          */
1126         switch (reloc->reloc_type) {
1127         case R_ARM_CALL:
1128         case R_ARM_JUMP24: {
1129                 guint32 *code = (guint32*)(gpointer)data;
1130                 guint32 ins = *code;
1131                 int diff = addr;
1132
1133                 if (reloc->reloc_type == R_ARM_CALL)
1134                         /* bl */
1135                         g_assert (data [3] == 0xeb);
1136                 else
1137                         /* b */
1138                         g_assert (data [3] == 0xea);
1139                 if (diff >= 0 && diff <= 33554431) {
1140                         diff >>= 2;
1141                         ins = (ins & 0xff000000) | diff;
1142                         *code = ins;
1143                 } else if (diff <= 0 && diff >= -33554432) {
1144                         diff >>= 2;
1145                         ins = (ins & 0xff000000) | (diff & ~0xff000000);
1146                         *code = ins;
1147                 } else {
1148                         g_assert_not_reached ();
1149                 }
1150                 break;
1151         }
1152         case R_ARM_ALU_PC_G0_NC: {
1153                 /* Generated by emit_plt () */
1154                 guint8 *code = data;
1155                 guint32 val = addr;
1156
1157                 g_assert (val <= 0xffffff);
1158                 if (val & 0xff0000)
1159                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, (val & 0xFF0000) >> 16, 16);
1160                 else
1161                         ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_PC, 0, 0);
1162                 ARM_ADD_REG_IMM (code, ARMREG_IP, ARMREG_IP, (val & 0xFF00) >> 8, 24);
1163                 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, val & 0xFF);
1164                 break;
1165         }
1166         default:
1167                 g_assert_not_reached ();
1168         }
1169 #else
1170         g_assert_not_reached ();
1171 #endif
1172 }
1173
1174 static ElfReloc*
1175 resolve_relocations (MonoImageWriter *acfg)
1176 {
1177         BinReloc *reloc;
1178         guint8 *data;
1179         gsize end_val, start_val;
1180         ElfReloc *rr;
1181         int i;
1182         gsize vaddr;
1183
1184         rr = g_new0 (ElfReloc, acfg->num_relocs);
1185         i = 0;
1186
1187         for (reloc = acfg->relocations; reloc; reloc = reloc->next) {
1188                 resolve_reloc (acfg, reloc, &data, &vaddr, &start_val, &end_val);
1189                 /* FIXME: little endian */
1190                 if (reloc->reloc_type) {
1191                         /* Must be static */
1192                         g_assert (start_val > 0);
1193                         do_reloc (acfg, reloc, data, end_val);
1194                 } else {
1195                         data [0] = end_val;
1196                         data [1] = end_val >> 8;
1197                         data [2] = end_val >> 16;
1198                         data [3] = end_val >> 24;
1199                 }
1200                 // FIXME:
1201                 if (start_val == 0 && reloc->val1 [0] != '.') {
1202                         rr [i].r_offset = vaddr;
1203                         rr [i].r_info = R_386_RELATIVE;
1204                         ++i;
1205                         g_assert (i <= acfg->num_relocs);
1206                 }
1207         }
1208         return rr;
1209 }
1210
1211 #endif /* USE_ELF_RELA */
1212
1213 static int normal_sections [] = { SECT_DATA, SECT_DEBUG_FRAME, SECT_DEBUG_INFO, SECT_DEBUG_ABBREV, SECT_DEBUG_LINE, SECT_DEBUG_LOC };
1214
1215 static int
1216 bin_writer_emit_writeout (MonoImageWriter *acfg)
1217 {
1218         ElfHeader header;
1219         ElfProgHeader progh [4];
1220         ElfSectHeader secth [SECT_NUM];
1221 #ifdef USE_ELF_RELA
1222         ElfRelocA *relocs;
1223 #else
1224         ElfReloc *relocs;
1225 #endif
1226         ElfStrTable str_table = {NULL, NULL};
1227         ElfStrTable sh_str_table = {NULL, NULL};
1228         ElfStrTable dyn_str_table = {NULL, NULL};
1229         BinSection* all_sections [32];
1230         BinSection* sections [SECT_NUM];
1231         ElfSymbol *dynsym;
1232         ElfSymbol *symtab;
1233         ElfDynamic dynamic [14];
1234         int *hash;
1235         int i, num_sections, file_offset, virt_offset, size;
1236         int num_local_syms;
1237
1238         /* Section headers */
1239         memset (&secth, 0, sizeof (secth));
1240         memset (&dynamic, 0, sizeof (dynamic));
1241         memset (&header, 0, sizeof (header));
1242
1243         for (i = 1; i < SECT_NUM; ++i) {
1244                 secth [i].sh_name = str_table_add (&sh_str_table, section_info [i].name);
1245                 secth [i].sh_type = section_info [i].type;
1246                 secth [i].sh_addralign = section_info [i].align;
1247                 secth [i].sh_flags = section_info [i].flags;
1248                 secth [i].sh_entsize = section_info [i].esize;
1249         }
1250         secth [SECT_DYNSYM].sh_info = TARGET_SIZEOF_VOID_P == 4 ? 4 : 2;
1251         secth [SECT_SYMTAB].sh_info = TARGET_SIZEOF_VOID_P == 4 ? 20 : 17;
1252         secth [SECT_HASH].sh_link = SECT_DYNSYM;
1253         secth [SECT_DYNSYM].sh_link = SECT_DYNSTR;
1254         secth [SECT_REL_DYN].sh_link = SECT_DYNSYM;
1255         secth [SECT_RELA_DYN].sh_link = SECT_DYNSYM;
1256         secth [SECT_DYNAMIC].sh_link = SECT_DYNSTR;
1257         secth [SECT_SYMTAB].sh_link = SECT_STRTAB;
1258
1259         num_sections = collect_sections (acfg, secth, all_sections, 16);
1260         hash = build_hash (acfg, num_sections, &dyn_str_table);
1261 #if 0
1262         g_print ("num_sections: %d\n", num_sections);
1263         g_print ("dynsym: %d, dynstr size: %d\n", hash [1], (int)dyn_str_table.data->len);
1264         for (i = 0; i < num_sections; ++i) {
1265                 g_print ("section %s, size: %d, %x\n", all_sections [i]->name, all_sections [i]->cur_offset, all_sections [i]->cur_offset);
1266         }
1267 #endif
1268         /* Associate the bin sections with the ELF sections */
1269         memset (sections, 0, sizeof (sections));
1270         for (i = 0; i < num_sections; ++i) {
1271                 BinSection *sect = all_sections [i];
1272                 int j;
1273
1274                 for (j = 0; j < SECT_NUM; ++j) {
1275                         if (strcmp (sect->name, section_info [j].name) == 0) {
1276                                 sect->shidx = j;
1277                                 break;
1278                         }
1279                 }
1280
1281                 sections [all_sections [i]->shidx] = sect;
1282         }
1283
1284         /* at this point we know where in the file the first segment sections go */
1285         dynsym = collect_syms (acfg, hash, &dyn_str_table, NULL, NULL);
1286         num_local_syms = hash [1];
1287         symtab = collect_syms (acfg, NULL, &str_table, secth, &num_local_syms);
1288
1289         file_offset = virt_offset = sizeof (header) + sizeof (progh);
1290         secth [SECT_HASH].sh_addr = secth [SECT_HASH].sh_offset = file_offset;
1291         size = sizeof (int) * (2 + hash [0] + hash [1]);
1292         virt_offset = (file_offset += size);
1293         secth [SECT_HASH].sh_size = size;
1294         secth [SECT_DYNSYM].sh_addr = secth [SECT_DYNSYM].sh_offset = file_offset;
1295         size = sizeof (ElfSymbol) * hash [1];
1296         virt_offset = (file_offset += size);
1297         secth [SECT_DYNSYM].sh_size = size;
1298         secth [SECT_DYNSTR].sh_addr = secth [SECT_DYNSTR].sh_offset = file_offset;
1299         size = dyn_str_table.data->len;
1300         virt_offset = (file_offset += size);
1301         secth [SECT_DYNSTR].sh_size = size;
1302         file_offset += 4-1;
1303         file_offset &= ~(4-1);
1304         secth [SECT_REL_DYN].sh_addr = secth [SECT_REL_DYN].sh_offset = file_offset;
1305 #ifndef USE_ELF_RELA
1306         size = sizeof (ElfReloc) * acfg->num_relocs;
1307 #else
1308         size = 0;
1309 #endif
1310         virt_offset = (file_offset += size);
1311         secth [SECT_REL_DYN].sh_size = size;
1312         secth [SECT_RELA_DYN].sh_addr = secth [SECT_RELA_DYN].sh_offset = file_offset;
1313 #ifdef USE_ELF_RELA
1314         size = sizeof (ElfRelocA) * acfg->num_relocs;
1315 #else
1316         size = 0;
1317 #endif
1318         virt_offset = (file_offset += size);
1319         secth [SECT_RELA_DYN].sh_size = size;
1320
1321         file_offset = ALIGN_TO (file_offset, secth [SECT_TEXT].sh_addralign);
1322         virt_offset = file_offset;
1323         secth [SECT_TEXT].sh_addr = secth [SECT_TEXT].sh_offset = file_offset;
1324         if (sections [SECT_TEXT]) {
1325                 if (sections [SECT_TEXT]->has_addr) {
1326                         secth [SECT_TEXT].sh_addr = sections [SECT_TEXT]->addr;
1327                         secth [SECT_TEXT].sh_flags &= ~SHF_ALLOC;
1328                 }
1329                 size = sections [SECT_TEXT]->cur_offset;
1330                 secth [SECT_TEXT].sh_size = size;
1331                 file_offset += size;
1332         }
1333
1334         file_offset = ALIGN_TO (file_offset, secth [SECT_RODATA].sh_addralign);
1335         virt_offset = file_offset;
1336         secth [SECT_RODATA].sh_addr = virt_offset;
1337         secth [SECT_RODATA].sh_offset = file_offset;
1338         if (sections [SECT_RODATA]) {
1339                 size = sections [SECT_RODATA]->cur_offset;
1340                 secth [SECT_RODATA].sh_size = size;
1341                 file_offset += size;
1342                 virt_offset += size;
1343         }
1344
1345         file_offset = ALIGN_TO (file_offset, secth [SECT_DYNAMIC].sh_addralign);
1346         virt_offset = file_offset;
1347
1348         /* .dynamic, .got.plt, .data, .bss here */
1349         /* Have to increase the virt offset since these go to a separate segment */
1350         virt_offset += PAGESIZE;
1351         secth [SECT_DYNAMIC].sh_addr = virt_offset;
1352         secth [SECT_DYNAMIC].sh_offset = file_offset;
1353         size = sizeof (dynamic);
1354         secth [SECT_DYNAMIC].sh_size = size;
1355         file_offset += size;
1356         virt_offset += size;
1357
1358         file_offset = ALIGN_TO (file_offset, secth [SECT_GOT_PLT].sh_addralign);
1359         virt_offset = ALIGN_TO (virt_offset, secth [SECT_GOT_PLT].sh_addralign);
1360         secth [SECT_GOT_PLT].sh_addr = virt_offset;
1361         secth [SECT_GOT_PLT].sh_offset = file_offset;
1362         size = 3 * TARGET_SIZEOF_VOID_P;
1363         secth [SECT_GOT_PLT].sh_size = size;
1364         file_offset += size;
1365         virt_offset += size;
1366
1367         file_offset = ALIGN_TO (file_offset, secth [SECT_DATA].sh_addralign);
1368         virt_offset = ALIGN_TO (virt_offset, secth [SECT_DATA].sh_addralign);
1369         secth [SECT_DATA].sh_addr = virt_offset;
1370         secth [SECT_DATA].sh_offset = file_offset;
1371         if (sections [SECT_DATA]) {
1372                 size = sections [SECT_DATA]->cur_offset;
1373                 secth [SECT_DATA].sh_size = size;
1374                 file_offset += size;
1375                 virt_offset += size;
1376         }
1377
1378         file_offset = ALIGN_TO (file_offset, secth [SECT_BSS].sh_addralign);
1379         virt_offset = ALIGN_TO (virt_offset, secth [SECT_BSS].sh_addralign);
1380         secth [SECT_BSS].sh_addr = virt_offset;
1381         secth [SECT_BSS].sh_offset = file_offset;
1382         if (sections [SECT_BSS]) {
1383                 size = sections [SECT_BSS]->cur_offset;
1384                 secth [SECT_BSS].sh_size = size;
1385         }
1386
1387         /* virtual doesn't matter anymore */
1388         file_offset = ALIGN_TO (file_offset, secth [SECT_DEBUG_FRAME].sh_addralign);
1389         secth [SECT_DEBUG_FRAME].sh_offset = file_offset;
1390         if (sections [SECT_DEBUG_FRAME])
1391                 size = sections [SECT_DEBUG_FRAME]->cur_offset;
1392         else
1393                 size = 0;
1394         secth [SECT_DEBUG_FRAME].sh_size = size;
1395         file_offset += size;
1396
1397         secth [SECT_DEBUG_INFO].sh_offset = file_offset;
1398         if (sections [SECT_DEBUG_INFO])
1399                 size = sections [SECT_DEBUG_INFO]->cur_offset;
1400         else
1401                 size = 0;
1402         secth [SECT_DEBUG_INFO].sh_size = size;
1403         file_offset += size;
1404
1405         secth [SECT_DEBUG_ABBREV].sh_offset = file_offset;
1406         if (sections [SECT_DEBUG_ABBREV])
1407                 size = sections [SECT_DEBUG_ABBREV]->cur_offset;
1408         else
1409                 size = 0;
1410         secth [SECT_DEBUG_ABBREV].sh_size = size;
1411         file_offset += size;
1412
1413         secth [SECT_DEBUG_LINE].sh_offset = file_offset;
1414         if (sections [SECT_DEBUG_LINE])
1415                 size = sections [SECT_DEBUG_LINE]->cur_offset;
1416         else
1417                 size = 0;
1418         secth [SECT_DEBUG_LINE].sh_size = size;
1419         file_offset += size;
1420
1421         secth [SECT_DEBUG_LOC].sh_offset = file_offset;
1422         if (sections [SECT_DEBUG_LOC])
1423                 size = sections [SECT_DEBUG_LOC]->cur_offset;
1424         else
1425                 size = 0;
1426         secth [SECT_DEBUG_LOC].sh_size = size;
1427         file_offset += size;
1428
1429         file_offset = ALIGN_TO (file_offset, secth [SECT_SHSTRTAB].sh_addralign);
1430         secth [SECT_SHSTRTAB].sh_offset = file_offset;
1431         size = sh_str_table.data->len;
1432         secth [SECT_SHSTRTAB].sh_size = size;
1433         file_offset += size;
1434
1435         file_offset = ALIGN_TO (file_offset, secth [SECT_SYMTAB].sh_addralign);
1436         secth [SECT_SYMTAB].sh_offset = file_offset;
1437         size = sizeof (ElfSymbol) * num_local_syms;
1438         secth [SECT_SYMTAB].sh_size = size;
1439         file_offset += size;
1440
1441         file_offset = ALIGN_TO (file_offset, secth [SECT_STRTAB].sh_addralign);
1442         secth [SECT_STRTAB].sh_offset = file_offset;
1443         size = str_table.data->len;
1444         secth [SECT_STRTAB].sh_size = size;
1445         file_offset += size;
1446
1447         for (i = 1; i < SECT_NUM; ++i) {
1448                 if (section_info [i].esize != 0)
1449                         g_assert (secth [i].sh_size % section_info [i].esize == 0);
1450         }
1451
1452         file_offset += 4-1;
1453         file_offset &= ~(4-1);
1454
1455         header.e_ident [EI_MAG0] = ELFMAG0;
1456         header.e_ident [EI_MAG1] = ELFMAG1;
1457         header.e_ident [EI_MAG2] = ELFMAG2;
1458         header.e_ident [EI_MAG3] = ELFMAG3;
1459         header.e_ident [EI_CLASS] = TARGET_SIZEOF_VOID_P == 4 ? ELFCLASS32 : ELFCLASS64;
1460         header.e_ident [EI_DATA] = ELFDATA2LSB;
1461         header.e_ident [EI_VERSION] = EV_CURRENT;
1462         header.e_ident [EI_OSABI] = ELFOSABI_NONE;
1463         header.e_ident [EI_ABIVERSION] = 0;
1464         for (i = EI_PAD; i < EI_NIDENT; ++i)
1465                 header.e_ident [i] = 0;
1466
1467         header.e_type = ET_DYN;
1468 #if defined(TARGET_X86)
1469         header.e_machine = EM_386;
1470 #elif defined(TARGET_AMD64)
1471         header.e_machine = EM_X86_64;
1472 #elif defined(TARGET_ARM)
1473         header.e_machine = EM_ARM;
1474 #else
1475         g_assert_not_reached ();
1476 #endif
1477         header.e_version = 1;
1478
1479         header.e_phoff = sizeof (header);
1480         header.e_ehsize = sizeof (header);
1481         header.e_phentsize = sizeof (ElfProgHeader);
1482         header.e_phnum = 4;
1483         header.e_entry = secth [SECT_TEXT].sh_addr;
1484         header.e_shstrndx = SECT_SHSTRTAB;
1485         header.e_shentsize = sizeof (ElfSectHeader);
1486         header.e_shnum = SECT_NUM;
1487         header.e_shoff = file_offset;
1488
1489         /* dynamic data */
1490         i = 0;
1491         dynamic [i].d_tag = DT_HASH;
1492         dynamic [i].d_un.d_val = secth [SECT_HASH].sh_offset;
1493         ++i;
1494         dynamic [i].d_tag = DT_STRTAB;
1495         dynamic [i].d_un.d_val = secth [SECT_DYNSTR].sh_offset;
1496         ++i;
1497         dynamic [i].d_tag = DT_SYMTAB;
1498         dynamic [i].d_un.d_val = secth [SECT_DYNSYM].sh_offset;
1499         ++i;
1500         dynamic [i].d_tag = DT_STRSZ;
1501         dynamic [i].d_un.d_val = dyn_str_table.data->len;
1502         ++i;
1503         dynamic [i].d_tag = DT_SYMENT;
1504         dynamic [i].d_un.d_val = sizeof (ElfSymbol);
1505         ++i;
1506 #ifdef USE_ELF_RELA
1507         dynamic [i].d_tag = DT_RELA;
1508         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_offset;
1509         ++i;
1510         dynamic [i].d_tag = DT_RELASZ;
1511         dynamic [i].d_un.d_val = secth [SECT_RELA_DYN].sh_size;
1512         ++i;
1513         dynamic [i].d_tag = DT_RELAENT;
1514         dynamic [i].d_un.d_val = sizeof (ElfRelocA);
1515         ++i;
1516 #else
1517         dynamic [i].d_tag = DT_REL;
1518         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_offset;
1519         ++i;
1520         dynamic [i].d_tag = DT_RELSZ;
1521         dynamic [i].d_un.d_val = secth [SECT_REL_DYN].sh_size;
1522         ++i;
1523         dynamic [i].d_tag = DT_RELENT;
1524         dynamic [i].d_un.d_val = sizeof (ElfReloc);
1525         ++i;
1526 #endif
1527         dynamic [i].d_tag = DT_RELCOUNT;
1528         dynamic [i].d_un.d_val = acfg->num_relocs;
1529         ++i;
1530
1531         /* Program header */
1532         memset (&progh, 0, sizeof (progh));
1533         progh [0].p_type = PT_LOAD;
1534         progh [0].p_filesz = progh [0].p_memsz = secth [SECT_DYNAMIC].sh_offset;
1535         progh [0].p_align = 4096;
1536         progh [0].p_flags = 5;
1537
1538         progh [1].p_type = PT_LOAD;
1539         progh [1].p_offset = secth [SECT_DYNAMIC].sh_offset;
1540         progh [1].p_vaddr = progh [1].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1541         progh [1].p_filesz = secth [SECT_BSS].sh_offset  - secth [SECT_DYNAMIC].sh_offset;
1542         progh [1].p_memsz = secth [SECT_BSS].sh_addr + secth [SECT_BSS].sh_size - secth [SECT_DYNAMIC].sh_addr;
1543         progh [1].p_align = 4096;
1544         progh [1].p_flags = 6;
1545
1546         progh [2].p_type = PT_DYNAMIC;
1547         progh [2].p_offset = secth [SECT_DYNAMIC].sh_offset;
1548         progh [2].p_vaddr = progh [2].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1549         progh [2].p_filesz = progh [2].p_memsz = secth [SECT_DYNAMIC].sh_size;
1550         progh [2].p_align = TARGET_SIZEOF_VOID_P;
1551         progh [2].p_flags = 6;
1552
1553         progh [3].p_type = PT_GNU_STACK;
1554         progh [3].p_offset = secth [SECT_DYNAMIC].sh_offset;
1555         progh [3].p_vaddr = progh [3].p_paddr = secth [SECT_DYNAMIC].sh_addr;
1556         progh [3].p_filesz = progh [3].p_memsz = secth [SECT_DYNAMIC].sh_size;
1557         progh [3].p_align = TARGET_SIZEOF_VOID_P;
1558         progh [3].p_flags = 6;
1559
1560         /* Compute the addresses of the bin sections, so relocation can be done */
1561         for (i = 0; i < SECT_NUM; ++i) {
1562                 if (sections [i]) {
1563                         sections [i]->file_offset = secth [i].sh_offset;
1564                         sections [i]->virt_offset = secth [i].sh_addr;
1565                 }
1566         }
1567
1568         reloc_symbols (acfg, dynsym, secth, &dyn_str_table, TRUE);
1569         reloc_symbols (acfg, symtab, secth, &str_table, FALSE);
1570         relocs = resolve_relocations (acfg);
1571
1572         if (!acfg->fp) {
1573                 acfg->out_buf_size = file_offset + sizeof (secth);
1574                 acfg->out_buf = (guint8 *)g_malloc (acfg->out_buf_size);
1575         }
1576
1577         bin_writer_fwrite (acfg, &header, sizeof (header), 1);
1578         bin_writer_fwrite (acfg, &progh, sizeof (progh), 1);
1579         bin_writer_fwrite (acfg, hash, sizeof (int) * (hash [0] + hash [1] + 2), 1);
1580         bin_writer_fwrite (acfg, dynsym, sizeof (ElfSymbol) * hash [1], 1);
1581         bin_writer_fwrite (acfg, dyn_str_table.data->str, dyn_str_table.data->len, 1);
1582         /* .rel.dyn */
1583         bin_writer_fseek (acfg, secth [SECT_REL_DYN].sh_offset);
1584         bin_writer_fwrite (acfg, relocs, sizeof (ElfReloc), acfg->num_relocs);
1585
1586         /* .rela.dyn */
1587         bin_writer_fseek (acfg, secth [SECT_RELA_DYN].sh_offset);
1588         bin_writer_fwrite (acfg, relocs, secth [SECT_RELA_DYN].sh_size, 1);
1589
1590         /* .text */
1591         if (sections [SECT_TEXT]) {
1592                 bin_writer_fseek (acfg, secth [SECT_TEXT].sh_offset);
1593                 bin_writer_fwrite (acfg, sections [SECT_TEXT]->data, sections [SECT_TEXT]->cur_offset, 1);
1594         }
1595         /* .rodata */
1596         if (sections [SECT_RODATA]) {
1597                 bin_writer_fseek (acfg, secth [SECT_RODATA].sh_offset);
1598                 bin_writer_fwrite (acfg, sections [SECT_RODATA]->data, sections [SECT_RODATA]->cur_offset, 1);
1599         }
1600         /* .dynamic */
1601         bin_writer_fseek (acfg, secth [SECT_DYNAMIC].sh_offset);
1602         bin_writer_fwrite (acfg, dynamic, sizeof (dynamic), 1);
1603
1604         /* .got.plt */
1605         size = secth [SECT_DYNAMIC].sh_addr;
1606         bin_writer_fseek (acfg, secth [SECT_GOT_PLT].sh_offset);
1607         bin_writer_fwrite (acfg, &size, sizeof (size), 1);
1608
1609         /* normal sections */
1610         for (i = 0; i < sizeof (normal_sections) / sizeof (normal_sections [0]); ++i) {
1611                 int sect = normal_sections [i];
1612
1613                 if (sections [sect]) {
1614                         bin_writer_fseek (acfg, secth [sect].sh_offset);
1615                         bin_writer_fwrite (acfg, sections [sect]->data, sections [sect]->cur_offset, 1);
1616                 }
1617         }
1618
1619         bin_writer_fseek (acfg, secth [SECT_SHSTRTAB].sh_offset);
1620         bin_writer_fwrite (acfg, sh_str_table.data->str, sh_str_table.data->len, 1);
1621         bin_writer_fseek (acfg, secth [SECT_SYMTAB].sh_offset);
1622         bin_writer_fwrite (acfg, symtab, sizeof (ElfSymbol) * num_local_syms, 1);
1623         bin_writer_fseek (acfg, secth [SECT_STRTAB].sh_offset);
1624         bin_writer_fwrite (acfg, str_table.data->str, str_table.data->len, 1);
1625         /*g_print ("file_offset %d vs %d\n", file_offset, ftell (file));*/
1626         /*g_assert (file_offset >= ftell (file));*/
1627         bin_writer_fseek (acfg, file_offset);
1628         bin_writer_fwrite (acfg, &secth, sizeof (secth), 1);
1629
1630         if (acfg->fp)
1631                 fclose (acfg->fp);
1632
1633         return 0;
1634 }
1635
1636 #endif /* USE_ELF_WRITER */
1637
1638 #endif /* USE_BIN_WRITER */
1639
1640 /* ASM WRITER */
1641
1642 static void
1643 asm_writer_emit_start (MonoImageWriter *acfg)
1644 {
1645 #if defined(TARGET_ASM_APPLE)
1646         fprintf (acfg->fp, ".subsections_via_symbols\n");
1647 #endif
1648 }
1649
1650 static int
1651 asm_writer_emit_writeout (MonoImageWriter *acfg)
1652 {
1653         fclose (acfg->fp);
1654
1655         return 0;
1656 }
1657
1658 static void
1659 asm_writer_emit_unset_mode (MonoImageWriter *acfg)
1660 {
1661         if (acfg->mode == EMIT_NONE)
1662                 return;
1663         fprintf (acfg->fp, "\n");
1664         acfg->mode = EMIT_NONE;
1665 }
1666
1667 static void
1668 asm_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
1669 {
1670         asm_writer_emit_unset_mode (acfg);
1671 #if defined(TARGET_ASM_APPLE)
1672         if (strcmp(section_name, ".bss") == 0)
1673                 fprintf (acfg->fp, "%s\n", ".data");
1674         else if (strstr (section_name, ".debug") == section_name) {
1675                 //g_assert (subsection_index == 0);
1676                 fprintf (acfg->fp, ".section __DWARF, __%s,regular,debug\n", section_name + 1);
1677         } else
1678                 fprintf (acfg->fp, "%s\n", section_name);
1679 #elif defined(TARGET_ARM) || defined(TARGET_ARM64) || defined(TARGET_POWERPC)
1680         /* ARM gas doesn't seem to like subsections of .bss */
1681         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data")) {
1682                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1683         } else {
1684                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1685                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1686         }
1687 #elif defined(HOST_WIN32)
1688         fprintf (acfg->fp, ".section %s\n", section_name);
1689 #else
1690         if (!strcmp (section_name, ".text") || !strcmp (section_name, ".data") || !strcmp (section_name, ".bss")) {
1691                 fprintf (acfg->fp, "%s %d\n", section_name, subsection_index);
1692         } else {
1693                 fprintf (acfg->fp, ".section \"%s\"\n", section_name);
1694                 fprintf (acfg->fp, ".subsection %d\n", subsection_index);
1695         }
1696 #endif
1697 }
1698
1699 static inline
1700 const char *get_label (const char *s)
1701 {
1702 #ifdef TARGET_ASM_APPLE
1703         if (s [0] == '.' && s [1] == 'L')
1704                 /* apple uses "L" instead of ".L" to mark temporary labels */
1705                 s ++;
1706 #endif
1707         return s;
1708 }
1709
1710 #ifdef TARGET_WIN32
1711 #define GLOBAL_SYMBOL_DEF_SCL 2
1712 #define LOCAL_SYMBOL_DEF_SCL 3
1713
1714 static gboolean
1715 asm_writer_in_data_section (MonoImageWriter *acfg)
1716 {
1717         gboolean        in_data_section = FALSE;
1718         const char      *data_sections [] = {".data", ".bss", ".rdata"};
1719
1720         for (guchar i = 0; i < G_N_ELEMENTS (data_sections); ++i) {
1721                 if (strcmp (acfg->current_section, data_sections [i]) == 0) {
1722                         in_data_section = TRUE;
1723                         break;
1724                 }
1725         }
1726
1727         return in_data_section;
1728 }
1729
1730 static void
1731 asm_writer_emit_symbol_type (MonoImageWriter *acfg, const char *name, gboolean func, gboolean global)
1732 {
1733         asm_writer_emit_unset_mode (acfg);
1734
1735         if (func) {
1736                 fprintf (acfg->fp, "\t.def %s; .scl %d; .type 32; .endef\n", name, (global == TRUE ? GLOBAL_SYMBOL_DEF_SCL : LOCAL_SYMBOL_DEF_SCL));
1737         } else {
1738                 if (!asm_writer_in_data_section (acfg))
1739                         fprintf (acfg->fp, "\t.data\n");
1740         }
1741
1742         return;
1743 }
1744
1745 #else
1746
1747 static void
1748 asm_writer_emit_symbol_type (MonoImageWriter *acfg, const char *name, gboolean func, gboolean global)
1749 {
1750         const char *stype;
1751
1752         if (func)
1753                 stype = "function";
1754         else
1755                 stype = "object";
1756
1757         asm_writer_emit_unset_mode (acfg);
1758
1759 #if defined(TARGET_ASM_APPLE)
1760
1761 #elif defined(TARGET_ARM)
1762         fprintf (acfg->fp, "\t.type %s,#%s\n", name, stype);
1763 #else
1764         fprintf (acfg->fp, "\t.type %s,@%s\n", name, stype);
1765 #endif
1766 }
1767 #endif /* TARGET_WIN32 */
1768
1769 static void
1770 asm_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
1771 {
1772         asm_writer_emit_unset_mode (acfg);
1773
1774         fprintf (acfg->fp, "\t.globl %s\n", name);
1775
1776         asm_writer_emit_symbol_type (acfg, name, func, TRUE);
1777 }
1778
1779 static void
1780 asm_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
1781 {
1782         asm_writer_emit_unset_mode (acfg);
1783
1784 #if !defined(TARGET_ASM_APPLE) && !defined(TARGET_WIN32)
1785         fprintf (acfg->fp, "\t.local %s\n", name);
1786 #endif
1787
1788         asm_writer_emit_symbol_type (acfg, name, func, FALSE);
1789 }
1790
1791 static void
1792 asm_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
1793 {
1794         asm_writer_emit_unset_mode (acfg);
1795
1796
1797 #if !defined(TARGET_ASM_APPLE) && !defined(TARGET_WIN32)
1798         fprintf (acfg->fp, "\t.size %s,%s-%s\n", name, end_label, name);
1799 #endif
1800 }
1801
1802 static void
1803 asm_writer_emit_label (MonoImageWriter *acfg, const char *name)
1804 {
1805         asm_writer_emit_unset_mode (acfg);
1806         fprintf (acfg->fp, "%s:\n", get_label (name));
1807 }
1808
1809 static void
1810 asm_writer_emit_string (MonoImageWriter *acfg, const char *value)
1811 {
1812         asm_writer_emit_unset_mode (acfg);
1813         fprintf (acfg->fp, "\t%s \"%s\"\n", AS_STRING_DIRECTIVE, value);
1814 }
1815
1816 static void
1817 asm_writer_emit_line (MonoImageWriter *acfg)
1818 {
1819         asm_writer_emit_unset_mode (acfg);
1820         fprintf (acfg->fp, "\n");
1821 }
1822
1823 static void
1824 asm_writer_emit_alignment (MonoImageWriter *acfg, int size)
1825 {
1826         asm_writer_emit_unset_mode (acfg);
1827 #if defined(TARGET_ARM)
1828         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1829 #elif defined(__ppc__) && defined(TARGET_ASM_APPLE)
1830         // the mach-o assembler specifies alignments as powers of 2.
1831         fprintf (acfg->fp, "\t.align %d\t; ilog2\n", ilog2(size));
1832 #elif defined(TARGET_ASM_GAS)
1833         fprintf (acfg->fp, "\t.balign %d\n", size);
1834 #elif defined(TARGET_ASM_APPLE)
1835         fprintf (acfg->fp, "\t.align %d\n", ilog2 (size));
1836 #else
1837         fprintf (acfg->fp, "\t.align %d\n", size);
1838 #endif
1839 }
1840
1841 #ifndef USE_BIN_WRITER
1842 static void
1843 asm_writer_emit_alignment_fill (MonoImageWriter *acfg, int size, int fill)
1844 {
1845         asm_writer_emit_unset_mode (acfg);
1846 #if defined(TARGET_ASM_APPLE)
1847         fprintf (acfg->fp, "\t.align %d, 0x%0x\n", ilog2 (size), fill);
1848 #else
1849         asm_writer_emit_alignment (acfg, size);
1850 #endif
1851 }
1852 #endif
1853
1854 static void
1855 asm_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
1856 {
1857         asm_writer_emit_unset_mode (acfg);
1858         fprintf (acfg->fp, "\t%s %s\n", AS_POINTER_DIRECTIVE, target ? target : "0");
1859 }
1860
1861 static void
1862 asm_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
1863 {
1864         asm_writer_emit_unset_mode (acfg);
1865         asm_writer_emit_alignment (acfg, sizeof (target_mgreg_t));
1866         asm_writer_emit_pointer_unaligned (acfg, target);
1867 }
1868
1869 static char *byte_to_str;
1870
1871 static void
1872 asm_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
1873 {
1874         int i;
1875         if (acfg->mode != EMIT_BYTE) {
1876                 acfg->mode = EMIT_BYTE;
1877                 acfg->col_count = 0;
1878         }
1879
1880         if (byte_to_str == NULL) {
1881                 byte_to_str = g_new0 (char, 256 * 8);
1882                 for (i = 0; i < 256; ++i) {
1883                         sprintf (byte_to_str + (i * 8), ",%d", i);
1884                 }
1885         }
1886
1887         for (i = 0; i < size; ++i, ++acfg->col_count) {
1888                 if ((acfg->col_count % 32) == 0)
1889                         fprintf (acfg->fp, "\n\t.byte %d", buf [i]);
1890                 else
1891                         fputs (byte_to_str + (buf [i] * 8), acfg->fp);
1892         }
1893 }
1894
1895 static inline void
1896 asm_writer_emit_int16 (MonoImageWriter *acfg, int value)
1897 {
1898         if (acfg->mode != EMIT_WORD) {
1899                 acfg->mode = EMIT_WORD;
1900                 acfg->col_count = 0;
1901         }
1902         if ((acfg->col_count++ % 8) == 0)
1903                 fprintf (acfg->fp, "\n\t%s ", AS_INT16_DIRECTIVE);
1904         else
1905                 fprintf (acfg->fp, ", ");
1906         fprintf (acfg->fp, "%d", value);
1907 }
1908
1909 static inline void
1910 asm_writer_emit_int32 (MonoImageWriter *acfg, int value)
1911 {
1912         if (acfg->mode != EMIT_LONG) {
1913                 acfg->mode = EMIT_LONG;
1914                 acfg->col_count = 0;
1915         }
1916         if ((acfg->col_count++ % 8) == 0)
1917                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1918         else
1919                 fprintf (acfg->fp, ",");
1920         fprintf (acfg->fp, "%d", value);
1921 }
1922
1923 static void
1924 asm_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
1925 {
1926 #ifdef TARGET_ASM_APPLE
1927         //char symbol [128];
1928 #endif
1929
1930         if (acfg->mode != EMIT_LONG) {
1931                 acfg->mode = EMIT_LONG;
1932                 acfg->col_count = 0;
1933         }
1934
1935         // FIXME: This doesn't seem to work on the iphone
1936 #if 0
1937         //#ifdef TARGET_ASM_APPLE
1938         /* The apple assembler needs a separate symbol to be able to handle complex expressions */
1939         sprintf (symbol, "LTMP_SYM%d", acfg->label_gen);
1940         start = get_label (start);
1941         end = get_label (end);
1942         acfg->label_gen ++;
1943         if (offset > 0)
1944                 fprintf (acfg->fp, "\n%s=%s - %s + %d", symbol, end, start, offset);
1945         else if (offset < 0)
1946                 fprintf (acfg->fp, "\n%s=%s - %s %d", symbol, end, start, offset);
1947         else
1948                 fprintf (acfg->fp, "\n%s=%s - %s", symbol, end, start);
1949
1950         fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1951         fprintf (acfg->fp, "%s", symbol);
1952 #else
1953         start = get_label (start);
1954         end = get_label (end);
1955
1956         if (offset == 0 && strcmp (start, ".") != 0) {
1957                 char symbol [128];
1958                 sprintf (symbol, "%sDIFF_SYM%d", AS_TEMP_LABEL_PREFIX, acfg->label_gen);
1959                 acfg->label_gen ++;
1960                 fprintf (acfg->fp, "\n%s=%s - %s", symbol, end, start);
1961                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1962                 fprintf (acfg->fp, "%s", symbol);
1963                 return;
1964         }
1965
1966         if ((acfg->col_count++ % 8) == 0)
1967                 fprintf (acfg->fp, "\n\t%s ", AS_INT32_DIRECTIVE);
1968         else
1969                 fprintf (acfg->fp, ",");
1970         if (offset > 0)
1971                 fprintf (acfg->fp, "%s - %s + %d", end, start, offset);
1972         else if (offset < 0)
1973                 fprintf (acfg->fp, "%s - %s %d", end, start, offset);
1974         else
1975                 fprintf (acfg->fp, "%s - %s", end, start);
1976 #endif
1977 }
1978
1979 static void
1980 asm_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
1981 {
1982         asm_writer_emit_unset_mode (acfg);
1983         fprintf (acfg->fp, "\t%s %d\n", AS_SKIP_DIRECTIVE, num);
1984 }
1985
1986 /* EMIT FUNCTIONS */
1987
1988 void
1989 mono_img_writer_emit_start (MonoImageWriter *acfg)
1990 {
1991 #ifdef USE_BIN_WRITER
1992         if (acfg->use_bin_writer)
1993                 bin_writer_emit_start (acfg);
1994         else
1995                 asm_writer_emit_start (acfg);
1996 #else
1997         asm_writer_emit_start (acfg);
1998 #endif
1999 }
2000
2001 void
2002 mono_img_writer_emit_section_change (MonoImageWriter *acfg, const char *section_name, int subsection_index)
2003 {
2004 #ifdef USE_BIN_WRITER
2005         if (acfg->use_bin_writer)
2006                 bin_writer_emit_section_change (acfg, section_name, subsection_index);
2007         else
2008                 asm_writer_emit_section_change (acfg, section_name, subsection_index);
2009 #else
2010         asm_writer_emit_section_change (acfg, section_name, subsection_index);
2011 #endif
2012
2013         acfg->current_section = section_name;
2014         acfg->current_subsection = subsection_index;
2015 }
2016
2017 void
2018 mono_img_writer_emit_push_section (MonoImageWriter *acfg, const char *section_name, int subsection)
2019 {
2020         g_assert (acfg->stack_pos < 16 - 1);
2021         acfg->section_stack [acfg->stack_pos] = acfg->current_section;
2022         acfg->subsection_stack [acfg->stack_pos] = acfg->current_subsection;
2023         acfg->stack_pos ++;
2024
2025         mono_img_writer_emit_section_change (acfg, section_name, subsection);
2026 }
2027
2028 void
2029 mono_img_writer_emit_pop_section (MonoImageWriter *acfg)
2030 {
2031         g_assert (acfg->stack_pos > 0);
2032         acfg->stack_pos --;
2033         mono_img_writer_emit_section_change (acfg, acfg->section_stack [acfg->stack_pos], acfg->subsection_stack [acfg->stack_pos]);
2034 }
2035
2036 void
2037 mono_img_writer_set_section_addr (MonoImageWriter *acfg, guint64 addr)
2038 {
2039 #ifdef USE_BIN_WRITER
2040         if (!acfg->use_bin_writer)
2041                 NOT_IMPLEMENTED;
2042         else
2043                 bin_writer_set_section_addr (acfg, addr);
2044 #else
2045         NOT_IMPLEMENTED;
2046 #endif
2047 }
2048
2049 void
2050 mono_img_writer_emit_global (MonoImageWriter *acfg, const char *name, gboolean func)
2051 {
2052 #ifdef USE_BIN_WRITER
2053         if (acfg->use_bin_writer)
2054                 bin_writer_emit_global (acfg, name, func);
2055         else
2056                 asm_writer_emit_global (acfg, name, func);
2057 #else
2058         asm_writer_emit_global (acfg, name, func);
2059 #endif
2060 }
2061
2062 void
2063 mono_img_writer_emit_local_symbol (MonoImageWriter *acfg, const char *name, const char *end_label, gboolean func)
2064 {
2065 #ifdef USE_BIN_WRITER
2066         if (acfg->use_bin_writer)
2067                 bin_writer_emit_local_symbol (acfg, name, end_label, func);
2068         else
2069                 asm_writer_emit_local_symbol (acfg, name, end_label, func);
2070 #else
2071         asm_writer_emit_local_symbol (acfg, name, end_label, func);
2072 #endif
2073 }
2074
2075 void
2076 mono_img_writer_emit_symbol_size (MonoImageWriter *acfg, const char *name, const char *end_label)
2077 {
2078         if (!acfg->use_bin_writer)
2079                 asm_writer_emit_symbol_size (acfg, name, end_label);
2080 }
2081
2082 void
2083 mono_img_writer_emit_label (MonoImageWriter *acfg, const char *name)
2084 {
2085 #ifdef USE_BIN_WRITER
2086         if (acfg->use_bin_writer)
2087                 bin_writer_emit_label (acfg, name);
2088         else
2089                 asm_writer_emit_label (acfg, name);
2090 #else
2091         asm_writer_emit_label (acfg, name);
2092 #endif
2093 }
2094
2095 void
2096 mono_img_writer_emit_bytes (MonoImageWriter *acfg, const guint8* buf, int size)
2097 {
2098 #ifdef USE_BIN_WRITER
2099         if (acfg->use_bin_writer)
2100                 bin_writer_emit_bytes (acfg, buf, size);
2101         else
2102                 asm_writer_emit_bytes (acfg, buf, size);
2103 #else
2104         asm_writer_emit_bytes (acfg, buf, size);
2105 #endif
2106 }
2107
2108 void
2109 mono_img_writer_emit_string (MonoImageWriter *acfg, const char *value)
2110 {
2111 #ifdef USE_BIN_WRITER
2112         if (acfg->use_bin_writer)
2113                 bin_writer_emit_string (acfg, value);
2114         else
2115                 asm_writer_emit_string (acfg, value);
2116 #else
2117         asm_writer_emit_string (acfg, value);
2118 #endif
2119 }
2120
2121 void
2122 mono_img_writer_emit_line (MonoImageWriter *acfg)
2123 {
2124 #ifdef USE_BIN_WRITER
2125         if (acfg->use_bin_writer)
2126                 bin_writer_emit_line (acfg);
2127         else
2128                 asm_writer_emit_line (acfg);
2129 #else
2130                 asm_writer_emit_line (acfg);
2131 #endif
2132 }
2133
2134 void
2135 mono_img_writer_emit_alignment (MonoImageWriter *acfg, int size)
2136 {
2137 #ifdef USE_BIN_WRITER
2138         if (acfg->use_bin_writer)
2139                 bin_writer_emit_alignment (acfg, size);
2140         else
2141                 asm_writer_emit_alignment (acfg, size);
2142 #else
2143         asm_writer_emit_alignment (acfg, size);
2144 #endif
2145 }
2146
2147 void
2148 mono_img_writer_emit_alignment_fill (MonoImageWriter *acfg, int size, int fill)
2149 {
2150 #ifdef USE_BIN_WRITER
2151         if (acfg->use_bin_writer)
2152                 bin_writer_emit_alignment (acfg, size);
2153         else
2154                 asm_writer_emit_alignment (acfg, size);
2155 #else
2156         asm_writer_emit_alignment_fill (acfg, size, fill);
2157 #endif
2158 }
2159
2160 void
2161 mono_img_writer_emit_pointer_unaligned (MonoImageWriter *acfg, const char *target)
2162 {
2163 #ifdef USE_BIN_WRITER
2164         if (acfg->use_bin_writer)
2165                 bin_writer_emit_pointer_unaligned (acfg, target);
2166         else
2167                 asm_writer_emit_pointer_unaligned (acfg, target);
2168 #else
2169         asm_writer_emit_pointer_unaligned (acfg, target);
2170 #endif
2171 }
2172
2173 void
2174 mono_img_writer_emit_pointer (MonoImageWriter *acfg, const char *target)
2175 {
2176 #ifdef USE_BIN_WRITER
2177         if (acfg->use_bin_writer)
2178                 bin_writer_emit_pointer (acfg, target);
2179         else
2180                 asm_writer_emit_pointer (acfg, target);
2181 #else
2182         asm_writer_emit_pointer (acfg, target);
2183 #endif
2184 }
2185
2186 void
2187 mono_img_writer_emit_int16 (MonoImageWriter *acfg, int value)
2188 {
2189 #ifdef USE_BIN_WRITER
2190         if (acfg->use_bin_writer)
2191                 bin_writer_emit_int16 (acfg, value);
2192         else
2193                 asm_writer_emit_int16 (acfg, value);
2194 #else
2195         asm_writer_emit_int16 (acfg, value);
2196 #endif
2197 }
2198
2199 void
2200 mono_img_writer_emit_int32 (MonoImageWriter *acfg, int value)
2201 {
2202 #ifdef USE_BIN_WRITER
2203         if (acfg->use_bin_writer)
2204                 bin_writer_emit_int32 (acfg, value);
2205         else
2206                 asm_writer_emit_int32 (acfg, value);
2207 #else
2208         asm_writer_emit_int32 (acfg, value);
2209 #endif
2210 }
2211
2212 void
2213 mono_img_writer_emit_symbol_diff (MonoImageWriter *acfg, const char *end, const char* start, int offset)
2214 {
2215 #ifdef USE_BIN_WRITER
2216         if (acfg->use_bin_writer)
2217                 bin_writer_emit_symbol_diff (acfg, end, start, offset);
2218         else
2219                 asm_writer_emit_symbol_diff (acfg, end, start, offset);
2220 #else
2221         asm_writer_emit_symbol_diff (acfg, end, start, offset);
2222 #endif
2223 }
2224
2225 void
2226 mono_img_writer_emit_zero_bytes (MonoImageWriter *acfg, int num)
2227 {
2228 #ifdef USE_BIN_WRITER
2229         if (acfg->use_bin_writer)
2230                 bin_writer_emit_zero_bytes (acfg, num);
2231         else
2232                 asm_writer_emit_zero_bytes (acfg, num);
2233 #else
2234         asm_writer_emit_zero_bytes (acfg, num);
2235 #endif
2236 }
2237
2238 int
2239 mono_img_writer_emit_writeout (MonoImageWriter *acfg)
2240 {
2241 #ifdef USE_BIN_WRITER
2242         if (acfg->use_bin_writer)
2243                 return bin_writer_emit_writeout (acfg);
2244         else
2245                 return asm_writer_emit_writeout (acfg);
2246 #else
2247                 return asm_writer_emit_writeout (acfg);
2248 #endif
2249 }
2250
2251 void
2252 mono_img_writer_emit_byte (MonoImageWriter *acfg, guint8 val)
2253 {
2254         mono_img_writer_emit_bytes (acfg, &val, 1);
2255 }
2256
2257 /*
2258  * Emit a relocation entry of type RELOC_TYPE against symbol SYMBOL at the current PC.
2259  * Do not advance PC.
2260  */
2261 void
2262 mono_img_writer_emit_reloc (MonoImageWriter *acfg, int reloc_type, const char *symbol, int addend)
2263 {
2264         /* This is only supported by the bin writer */
2265 #ifdef USE_BIN_WRITER
2266         if (acfg->use_bin_writer)
2267                 bin_writer_emit_reloc (acfg, reloc_type, symbol, addend);
2268         else
2269                 g_assert_not_reached ();
2270 #else
2271                 g_assert_not_reached ();
2272 #endif
2273 }
2274
2275 /*
2276  * mono_img_writer_emit_unset_mode:
2277  *
2278  *   Flush buffered data so it is safe to write to the output file from outside this
2279  * module. This is a nop for the binary writer.
2280  */
2281 void
2282 mono_img_writer_emit_unset_mode (MonoImageWriter *acfg)
2283 {
2284         if (!acfg->use_bin_writer)
2285                 asm_writer_emit_unset_mode (acfg);
2286 }
2287
2288 /*
2289  * mono_img_writer_get_output:
2290  *
2291  *   Return the output buffer of a binary writer emitting to memory. The returned memory
2292  * is from malloc, and it is owned by the caller.
2293  */
2294 guint8*
2295 mono_img_writer_get_output (MonoImageWriter *acfg, guint32 *size)
2296 {
2297 #ifdef USE_BIN_WRITER
2298         guint8 *buf;
2299
2300         g_assert (acfg->use_bin_writer);
2301
2302         buf = acfg->out_buf;
2303         *size = acfg->out_buf_size;
2304         acfg->out_buf = NULL;
2305         return buf;
2306 #else
2307         g_assert_not_reached ();
2308         return NULL;
2309 #endif
2310 }
2311
2312 /*
2313  * Return whenever the binary writer is supported on this platform.
2314  */
2315 gboolean
2316 mono_bin_writer_supported (void)
2317 {
2318 #ifdef USE_BIN_WRITER
2319         return TRUE;
2320 #else
2321         return FALSE;
2322 #endif
2323 }
2324
2325 /*
2326  * mono_img_writer_create:
2327  *
2328  *   Create an image writer writing to FP. If USE_BIN_WRITER is TRUE, FP can be NULL,
2329  * in this case the image writer will write to a memory buffer obtainable by calling
2330  * mono_img_writer_get_output ().
2331  */
2332 MonoImageWriter*
2333 mono_img_writer_create (FILE *fp, gboolean use_bin_writer)
2334 {
2335         MonoImageWriter *w = g_new0 (MonoImageWriter, 1);
2336
2337 #ifndef USE_BIN_WRITER
2338         g_assert (!use_bin_writer);
2339 #endif
2340
2341         if (!use_bin_writer)
2342                 g_assert (fp);
2343
2344         w->fp = fp;
2345         w->use_bin_writer = use_bin_writer;
2346         w->mempool = mono_mempool_new ();
2347
2348         return w;
2349 }
2350
2351 void
2352 mono_img_writer_destroy (MonoImageWriter *w)
2353 {
2354         // FIXME: Free all the stuff
2355         mono_mempool_destroy (w->mempool);
2356         g_free (w);
2357 }
2358
2359 gboolean
2360 mono_img_writer_subsections_supported (MonoImageWriter *acfg)
2361 {
2362 #ifdef TARGET_ASM_APPLE
2363         return acfg->use_bin_writer;
2364 #else
2365         return TRUE;
2366 #endif
2367 }
2368
2369 FILE *
2370 mono_img_writer_get_fp (MonoImageWriter *acfg)
2371 {
2372         return acfg->fp;
2373 }
2374
2375 const char *
2376 mono_img_writer_get_temp_label_prefix (MonoImageWriter *acfg)
2377 {
2378         return AS_TEMP_LABEL_PREFIX;
2379 }