darwin-user/machload.c

   1 /*
   2  *  Mach-O object file loading
   3  *
   4  *  Copyright (c) 2006 Pierre d'Herbemont
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include <stdio.h>
  20 #include <sys/types.h>
  21 #include <fcntl.h>
  22 #include <sys/stat.h>
  23 #include <errno.h>
  24 #include <unistd.h>
  25 #include <sys/mman.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "qemu.h"
  30 #include "disas.h"
  31
  32 #include <mach-o/loader.h>
  33 #include <mach-o/fat.h>
  34 #include <mach-o/nlist.h>
  35 #include <mach-o/reloc.h>
  36 #include <mach-o/ppc/reloc.h>
  37
  38 //#define DEBUG_MACHLOAD
  39
  40 #ifdef DEBUG_MACHLOAD
  41 # define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
  42 #else
  43 # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
  44 #endif
  45
  46 # define check_mach_header(x) (x.magic == MH_CIGAM)
  47
  48 extern const char *interp_prefix;
  49
  50 /* we don't have a good implementation for this */
  51 #define DONT_USE_DYLD_SHARED_MAP
  52
  53 /* Pass extra arg to DYLD for debug */
  54 //#define ACTIVATE_DYLD_TRACE
  55
  56 //#define OVERRIDE_DYLINKER
  57
  58 #ifdef OVERRIDE_DYLINKER
  59 # ifdef TARGET_I386
  60 #  define DYLINKER_NAME "/Users/steg/qemu/tests/i386-darwin-env/usr/lib/dyld"
  61 # else
  62 #  define DYLINKER_NAME "/usr/lib/dyld"
  63 # endif
  64 #endif
  65
  66 /* XXX: in an include */
  67 struct nlist_extended
  68 {
  69     union {
  70         char *n_name;
  71         long  n_strx;
  72     } n_un;
  73     unsigned char n_type;
  74     unsigned char n_sect;
  75     short st_desc;
  76     unsigned long st_value;
  77     unsigned long st_size;
  78 };
  79
  80 /* Print symbols in gdb */
  81 void *macho_text_sect = 0;
  82 int   macho_offset = 0;
  83
  84 int load_object(const char *filename, struct target_pt_regs * regs, void ** mh);
  85 void qerror(const char *format, ...);
  86 #ifdef TARGET_I386
  87 typedef struct mach_i386_thread_state {
  88     unsigned int    eax;
  89     unsigned int    ebx;
  90     unsigned int    ecx;
  91     unsigned int    edx;
  92     unsigned int    edi;
  93     unsigned int    esi;
  94     unsigned int    ebp;
  95     unsigned int    esp;
  96     unsigned int    ss;
  97     unsigned int    eflags;
  98     unsigned int    eip;
  99     unsigned int    cs;
 100     unsigned int    ds;
 101     unsigned int    es;
 102     unsigned int    fs;
 103     unsigned int    gs;
 104 } mach_i386_thread_state_t;
 105
 106 void bswap_i386_thread_state(struct mach_i386_thread_state *ts)
 107 {
 108     bswap32s((uint32_t*)&ts->eax);
 109     bswap32s((uint32_t*)&ts->ebx);
 110     bswap32s((uint32_t*)&ts->ecx);
 111     bswap32s((uint32_t*)&ts->edx);
 112     bswap32s((uint32_t*)&ts->edi);
 113     bswap32s((uint32_t*)&ts->esi);
 114     bswap32s((uint32_t*)&ts->ebp);
 115     bswap32s((uint32_t*)&ts->esp);
 116     bswap32s((uint32_t*)&ts->ss);
 117     bswap32s((uint32_t*)&ts->eflags);
 118     bswap32s((uint32_t*)&ts->eip);
 119     bswap32s((uint32_t*)&ts->cs);
 120     bswap32s((uint32_t*)&ts->ds);
 121     bswap32s((uint32_t*)&ts->es);
 122     bswap32s((uint32_t*)&ts->fs);
 123     bswap32s((uint32_t*)&ts->gs);
 124 }
 125 #define target_thread_state mach_i386_thread_state
 126 #define TARGET_CPU_TYPE CPU_TYPE_I386
 127 #define TARGET_CPU_NAME "i386"
 128 #endif
 129
 130 #ifdef TARGET_PPC
 131 struct mach_ppc_thread_state {
 132     unsigned int srr0;      /* Instruction address register (PC) */
 133     unsigned int srr1;    /* Machine state register (supervisor) */
 134     unsigned int r0;
 135     unsigned int r1;
 136     unsigned int r2;
 137     unsigned int r3;
 138     unsigned int r4;
 139     unsigned int r5;
 140     unsigned int r6;
 141     unsigned int r7;
 142     unsigned int r8;
 143     unsigned int r9;
 144     unsigned int r10;
 145     unsigned int r11;
 146     unsigned int r12;
 147     unsigned int r13;
 148     unsigned int r14;
 149     unsigned int r15;
 150     unsigned int r16;
 151     unsigned int r17;
 152     unsigned int r18;
 153     unsigned int r19;
 154     unsigned int r20;
 155     unsigned int r21;
 156     unsigned int r22;
 157     unsigned int r23;
 158     unsigned int r24;
 159     unsigned int r25;
 160     unsigned int r26;
 161     unsigned int r27;
 162     unsigned int r28;
 163     unsigned int r29;
 164     unsigned int r30;
 165     unsigned int r31;
 166
 167     unsigned int cr;        /* Condition register */
 168     unsigned int xer;    /* User's integer exception register */
 169     unsigned int lr;    /* Link register */
 170     unsigned int ctr;    /* Count register */
 171     unsigned int mq;    /* MQ register (601 only) */
 172
 173     unsigned int vrsave;    /* Vector Save Register */
 174 };
 175
 176 void bswap_ppc_thread_state(struct mach_ppc_thread_state *ts)
 177 {
 178     bswap32s((uint32_t*)&ts->srr0);
 179     bswap32s((uint32_t*)&ts->srr1);
 180     bswap32s((uint32_t*)&ts->r0);
 181     bswap32s((uint32_t*)&ts->r1);
 182     bswap32s((uint32_t*)&ts->r2);
 183     bswap32s((uint32_t*)&ts->r3);
 184     bswap32s((uint32_t*)&ts->r4);
 185     bswap32s((uint32_t*)&ts->r5);
 186     bswap32s((uint32_t*)&ts->r6);
 187     bswap32s((uint32_t*)&ts->r7);
 188     bswap32s((uint32_t*)&ts->r8);
 189     bswap32s((uint32_t*)&ts->r9);
 190     bswap32s((uint32_t*)&ts->r10);
 191     bswap32s((uint32_t*)&ts->r11);
 192     bswap32s((uint32_t*)&ts->r12);
 193     bswap32s((uint32_t*)&ts->r13);
 194     bswap32s((uint32_t*)&ts->r14);
 195     bswap32s((uint32_t*)&ts->r15);
 196     bswap32s((uint32_t*)&ts->r16);
 197     bswap32s((uint32_t*)&ts->r17);
 198     bswap32s((uint32_t*)&ts->r18);
 199     bswap32s((uint32_t*)&ts->r19);
 200     bswap32s((uint32_t*)&ts->r20);
 201     bswap32s((uint32_t*)&ts->r21);
 202     bswap32s((uint32_t*)&ts->r22);
 203     bswap32s((uint32_t*)&ts->r23);
 204     bswap32s((uint32_t*)&ts->r24);
 205     bswap32s((uint32_t*)&ts->r25);
 206     bswap32s((uint32_t*)&ts->r26);
 207     bswap32s((uint32_t*)&ts->r27);
 208     bswap32s((uint32_t*)&ts->r28);
 209     bswap32s((uint32_t*)&ts->r29);
 210     bswap32s((uint32_t*)&ts->r30);
 211     bswap32s((uint32_t*)&ts->r31);
 212
 213     bswap32s((uint32_t*)&ts->cr);
 214     bswap32s((uint32_t*)&ts->xer);
 215     bswap32s((uint32_t*)&ts->lr);
 216     bswap32s((uint32_t*)&ts->ctr);
 217     bswap32s((uint32_t*)&ts->mq);
 218
 219     bswap32s((uint32_t*)&ts->vrsave);
 220 }
 221
 222 #define target_thread_state mach_ppc_thread_state
 223 #define TARGET_CPU_TYPE CPU_TYPE_POWERPC
 224 #define TARGET_CPU_NAME "PowerPC"
 225 #endif
 226
 227 struct target_thread_command {
 228     unsigned long    cmd;    /* LC_THREAD or  LC_UNIXTHREAD */
 229     unsigned long    cmdsize;    /* total size of this command */
 230     unsigned long flavor;    /* flavor of thread state */
 231     unsigned long count;        /* count of longs in thread state */
 232     struct target_thread_state state;  /* thread state for this flavor */
 233 };
 234
 235 void bswap_tc(struct target_thread_command *tc)
 236 {
 237     bswap32s((uint32_t*)(&tc->flavor));
 238     bswap32s((uint32_t*)&tc->count);
 239 #if defined(TARGET_I386)
 240     bswap_i386_thread_state(&tc->state);
 241 #elif defined(TARGET_PPC)
 242     bswap_ppc_thread_state(&tc->state);
 243 #else
 244 # error unknown TARGET_CPU_TYPE
 245 #endif
 246 }
 247
 248 void bswap_mh(struct mach_header *mh)
 249 {
 250     bswap32s((uint32_t*)(&mh->magic));
 251     bswap32s((uint32_t*)&mh->cputype);
 252     bswap32s((uint32_t*)&mh->cpusubtype);
 253     bswap32s((uint32_t*)&mh->filetype);
 254     bswap32s((uint32_t*)&mh->ncmds);
 255     bswap32s((uint32_t*)&mh->sizeofcmds);
 256     bswap32s((uint32_t*)&mh->flags);
 257 }
 258
 259 void bswap_lc(struct load_command *lc)
 260 {
 261     bswap32s((uint32_t*)&lc->cmd);
 262     bswap32s((uint32_t*)&lc->cmdsize);
 263 }
 264
 265
 266 void bswap_fh(struct fat_header *fh)
 267 {
 268     bswap32s((uint32_t*)&fh->magic);
 269     bswap32s((uint32_t*)&fh->nfat_arch);
 270 }
 271
 272 void bswap_fa(struct fat_arch *fa)
 273 {
 274     bswap32s((uint32_t*)&fa->cputype);
 275     bswap32s((uint32_t*)&fa->cpusubtype);
 276     bswap32s((uint32_t*)&fa->offset);
 277     bswap32s((uint32_t*)&fa->size);
 278     bswap32s((uint32_t*)&fa->align);
 279 }
 280
 281 void bswap_segcmd(struct segment_command *sc)
 282 {
 283     bswap32s((uint32_t*)&sc->vmaddr);
 284     bswap32s((uint32_t*)&sc->vmsize);
 285     bswap32s((uint32_t*)&sc->fileoff);
 286     bswap32s((uint32_t*)&sc->filesize);
 287     bswap32s((uint32_t*)&sc->maxprot);
 288     bswap32s((uint32_t*)&sc->initprot);
 289     bswap32s((uint32_t*)&sc->nsects);
 290     bswap32s((uint32_t*)&sc->flags);
 291 }
 292
 293 void bswap_symtabcmd(struct symtab_command *stc)
 294 {
 295     bswap32s((uint32_t*)&stc->cmd);
 296     bswap32s((uint32_t*)&stc->cmdsize);
 297     bswap32s((uint32_t*)&stc->symoff);
 298     bswap32s((uint32_t*)&stc->nsyms);
 299     bswap32s((uint32_t*)&stc->stroff);
 300     bswap32s((uint32_t*)&stc->strsize);
 301 }
 302
 303 void bswap_sym(struct nlist *n)
 304 {
 305     bswap32s((uint32_t*)&n->n_un.n_strx);
 306     bswap16s((uint16_t*)&n->n_desc);
 307     bswap32s((uint32_t*)&n->n_value);
 308 }
 309
 310 int load_thread(struct mach_header *mh, struct target_thread_command *tc, struct target_pt_regs * regs, int fd, int mh_pos, int need_bswap)
 311 {
 312     int entry;
 313     if(need_bswap)
 314         bswap_tc(tc);
 315 #if defined(TARGET_I386)
 316     entry = tc->state.eip;
 317     DPRINTF(" eax 0x%.8x\n ebx 0x%.8x\n ecx 0x%.8x\n edx 0x%.8x\n edi 0x%.8x\n esi 0x%.8x\n ebp 0x%.8x\n esp 0x%.8x\n ss 0x%.8x\n eflags 0x%.8x\n eip 0x%.8x\n cs 0x%.8x\n ds 0x%.8x\n es 0x%.8x\n fs 0x%.8x\n gs 0x%.8x\n",
 318             tc->state.eax, tc->state.ebx, tc->state.ecx, tc->state.edx, tc->state.edi, tc->state.esi, tc->state.ebp,
 319             tc->state.esp, tc->state.ss, tc->state.eflags, tc->state.eip, tc->state.cs, tc->state.ds, tc->state.es,
 320             tc->state.fs, tc->state.gs );
 321 #define reg_copy(reg)   regs->reg = tc->state.reg
 322     if(regs)
 323     {
 324         reg_copy(eax);
 325         reg_copy(ebx);
 326         reg_copy(ecx);
 327         reg_copy(edx);
 328
 329         reg_copy(edi);
 330         reg_copy(esi);
 331
 332         reg_copy(ebp);
 333         reg_copy(esp);
 334
 335         reg_copy(eflags);
 336         reg_copy(eip);
 337     /*
 338         reg_copy(ss);
 339         reg_copy(cs);
 340         reg_copy(ds);
 341         reg_copy(es);
 342         reg_copy(fs);
 343         reg_copy(gs);*/
 344     }
 345 #undef reg_copy
 346 #elif defined(TARGET_PPC)
 347     entry =  tc->state.srr0;
 348 #endif
 349     DPRINTF("load_thread: entry 0x%x\n", entry);
 350     return entry;
 351 }
 352
 353 int load_dylinker(struct mach_header *mh, struct dylinker_command *dc, int fd, int mh_pos, int need_bswap)
 354 {
 355     int size;
 356     char * dylinker_name;
 357     size = dc->cmdsize - sizeof(struct dylinker_command);
 358
 359     if(need_bswap)
 360         dylinker_name = (char*)(bswap_32(dc->name.offset)+(int)dc);
 361     else
 362         dylinker_name = (char*)((dc->name.offset)+(int)dc);
 363
 364 #ifdef OVERRIDE_DYLINKER
 365     dylinker_name = DYLINKER_NAME;
 366 #else
 367     if(asprintf(&dylinker_name, "%s%s", interp_prefix, dylinker_name) == -1)
 368         qerror("can't allocate the new dylinker name\n");
 369 #endif
 370
 371     DPRINTF("dylinker_name %s\n", dylinker_name);
 372     return load_object(dylinker_name, NULL, NULL);
 373 }
 374
 375 int load_segment(struct mach_header *mh, struct segment_command *sc, int fd, int mh_pos, int need_bswap, int fixed, int slide)
 376 {
 377     unsigned long addr = sc->vmaddr;
 378     unsigned long size = sc->filesize;
 379     unsigned long error = 0;
 380
 381     if(need_bswap)
 382         bswap_segcmd(sc);
 383
 384     if(sc->vmaddr == 0)
 385     {
 386         DPRINTF("load_segment: sc->vmaddr == 0 returning\n");
 387         return -1;
 388     }
 389
 390     if (strcmp(sc->segname, "__PAGEZERO") == 0)
 391     {
 392         DPRINTF("load_segment: __PAGEZERO returning\n");
 393         return -1;
 394     }
 395
 396     /* Right now mmap memory */
 397     /* XXX: should check to see that the space is free, because MAP_FIXED is dangerous */
 398     DPRINTF("load_segment: mmaping %s to 0x%x-(0x%x|0x%x) + 0x%x\n", sc->segname, sc->vmaddr, sc->filesize, sc->vmsize, slide);
 399
 400     if(sc->filesize > 0)
 401     {
 402         int opt = 0;
 403
 404         if(fixed)
 405             opt |= MAP_FIXED;
 406
 407         DPRINTF("sc->vmaddr 0x%x slide 0x%x add 0x%x\n", slide, sc->vmaddr, sc->vmaddr+slide);
 408
 409         addr = target_mmap(sc->vmaddr+slide, sc->filesize,  sc->initprot, opt, fd, mh_pos + sc->fileoff);
 410
 411         if(addr==-1)
 412             qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
 413
 414         error = addr-sc->vmaddr;
 415     }
 416     else
 417     {
 418         addr = sc->vmaddr+slide;
 419         error = slide;
 420     }
 421
 422     if(sc->vmsize > sc->filesize)
 423     {
 424         addr += sc->filesize;
 425         size = sc->vmsize-sc->filesize;
 426         addr = target_mmap(addr, size, sc->initprot, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 427         if(addr==-1)
 428             qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
 429     }
 430
 431     return error;
 432 }
 433
 434 void *load_data(int fd, long offset, unsigned int size)
 435 {
 436     char *data;
 437
 438     data = malloc(size);
 439     if (!data)
 440         return NULL;
 441     lseek(fd, offset, SEEK_SET);
 442     if (read(fd, data, size) != size) {
 443         free(data);
 444         return NULL;
 445     }
 446     return data;
 447 }
 448
 449 /* load a mach-o object file */
 450 int load_object(const char *filename, struct target_pt_regs * regs, void ** mh)
 451 {
 452     int need_bswap = 0;
 453     int entry_point = 0;
 454     int dyld_entry_point = 0;
 455     int slide, mmapfixed;
 456     int fd;
 457     struct load_command *lcmds, *lc;
 458     int is_fat = 0;
 459     unsigned int i, magic;
 460     int mach_hdr_pos = 0;
 461     struct mach_header mach_hdr;
 462
 463     /* for symbol lookup whith -d flag. */
 464     struct symtab_command *    symtabcmd = 0;
 465     struct nlist_extended *symtab, *sym;
 466     struct nlist     *symtab_std, *syment;
 467     char            *strtab;
 468
 469     fd = open(filename, O_RDONLY);
 470     if (fd < 0)
 471         qerror("can't open file '%s'", filename);
 472
 473     /* Read magic header.  */
 474     if (read(fd, &magic, sizeof (magic)) != sizeof (magic))
 475         qerror("unable to read Magic of '%s'", filename);
 476
 477     /* Check Mach identification.  */
 478     if(magic == MH_MAGIC)
 479     {
 480         is_fat = 0;
 481         need_bswap = 0;
 482     } else if (magic == MH_CIGAM)
 483     {
 484         is_fat = 0;
 485         need_bswap = 1;
 486     } else if (magic == FAT_MAGIC)
 487     {
 488         is_fat = 1;
 489         need_bswap = 0;
 490     } else if (magic == FAT_CIGAM)
 491     {
 492         is_fat = 1;
 493         need_bswap = 1;
 494     }
 495     else
 496         qerror("Not a Mach-O file.", filename);
 497
 498     DPRINTF("loading %s %s...\n", filename, is_fat ? "[FAT]": "[REGULAR]");
 499     if(is_fat)
 500     {
 501         int found = 0;
 502         struct fat_header fh;
 503         struct fat_arch *fa;
 504
 505         lseek(fd, 0, SEEK_SET);
 506
 507         /* Read Fat header.  */
 508         if (read(fd, &fh, sizeof (fh)) != sizeof (fh))
 509             qerror("unable to read file header");
 510
 511         if(need_bswap)
 512             bswap_fh(&fh);
 513
 514         /* Read Fat Arch.  */
 515         fa = malloc(sizeof(struct fat_arch)*fh.nfat_arch);
 516
 517         if (read(fd, fa, sizeof(struct fat_arch)*fh.nfat_arch) != sizeof(struct fat_arch)*fh.nfat_arch)
 518             qerror("unable to read file header");
 519
 520         for( i = 0; i < fh.nfat_arch; i++, fa++)
 521         {
 522             if(need_bswap)
 523                 bswap_fa(fa);
 524             if(fa->cputype == TARGET_CPU_TYPE)
 525             {
 526                 mach_hdr_pos = fa->offset;
 527                 lseek(fd, mach_hdr_pos, SEEK_SET);
 528
 529                 /* Read Mach header.  */
 530
 531                 if (read(fd, &mach_hdr, sizeof(struct mach_header)) != sizeof (struct mach_header))
 532                     qerror("unable to read file header");
 533
 534                 if(mach_hdr.magic == MH_MAGIC)
 535                     need_bswap = 0;
 536                 else if (mach_hdr.magic == MH_CIGAM)
 537                     need_bswap = 1;
 538                 else
 539                     qerror("Invalid mach header in Fat Mach-O File");
 540                 found = 1;
 541                 break;
 542             }
 543         }
 544         if(!found)
 545             qerror("%s: No %s CPU found in FAT Header", filename, TARGET_CPU_NAME);
 546     }
 547     else
 548     {
 549         lseek(fd, 0, SEEK_SET);
 550         /* Read Mach header */
 551         if (read(fd, &mach_hdr, sizeof (mach_hdr)) != sizeof (mach_hdr))
 552             qerror("%s: unable to read file header", filename);
 553     }
 554
 555     if(need_bswap)
 556         bswap_mh(&mach_hdr);
 557
 558     if ((mach_hdr.cputype) != TARGET_CPU_TYPE)
 559         qerror("%s: Unsupported CPU 0x%x (only 0x%x(%s) supported)", filename, mach_hdr.cputype, TARGET_CPU_TYPE, TARGET_CPU_NAME);
 560
 561
 562     switch(mach_hdr.filetype)
 563     {
 564         case MH_EXECUTE:  break;
 565         case MH_FVMLIB:
 566         case MH_DYLIB:
 567         case MH_DYLINKER: break;
 568         default:
 569             qerror("%s: Unsupported Mach type (0x%x)", filename, mach_hdr.filetype);
 570     }
 571
 572     /* read segment headers */
 573     lcmds = malloc(mach_hdr.sizeofcmds);
 574
 575     if(read(fd, lcmds, mach_hdr.sizeofcmds) != mach_hdr.sizeofcmds)
 576             qerror("%s: unable to read load_command", filename);
 577     slide = 0;
 578     mmapfixed = 0;
 579     for(i=0, lc = lcmds; i < (mach_hdr.ncmds) ; i++)
 580     {
 581
 582         if(need_bswap)
 583             bswap_lc(lc);
 584         switch(lc->cmd)
 585         {
 586             case LC_SEGMENT:
 587                 /* The main_exe can't be relocated */
 588                 if(mach_hdr.filetype == MH_EXECUTE)
 589                     mmapfixed = 1;
 590
 591                 slide = load_segment(&mach_hdr, (struct segment_command*)lc, fd, mach_hdr_pos, need_bswap, mmapfixed, slide);
 592
 593                 /* other segment must be mapped according to slide exactly, if load_segment did something */
 594                 if(slide != -1)
 595                     mmapfixed = 1;
 596                 else
 597                     slide = 0; /* load_segment didn't map the segment */
 598
 599                 if(mach_hdr.filetype == MH_EXECUTE && slide != 0)
 600                     qerror("%s: Warning executable can't be mapped at the right address (offset: 0x%x)\n", filename, slide);
 601
 602                 if(strcmp(((struct segment_command*)(lc))->segname, "__TEXT") == 0)
 603                 {
 604                     /* Text section */
 605                     if(mach_hdr.filetype == MH_EXECUTE)
 606                     {
 607                         /* return the mach_header */
 608                         *mh = (void*)(((struct segment_command*)(lc))->vmaddr + slide);
 609                     }
 610                     else
 611                     {
 612                         /* it is dyld save the section for gdb, we will be interested in dyld symbol
 613                            while debuging */
 614                         macho_text_sect = (void*)(((struct segment_command*)(lc))->vmaddr + slide);
 615                         macho_offset = slide;
 616                     }
 617                 }
 618                 break;
 619             case LC_LOAD_DYLINKER:
 620                 dyld_entry_point = load_dylinker( &mach_hdr, (struct dylinker_command*)lc, fd, mach_hdr_pos, need_bswap );
 621                 break;
 622             case LC_LOAD_DYLIB:
 623                 /* dyld will do that for us */
 624                 break;
 625             case LC_THREAD:
 626             case LC_UNIXTHREAD:
 627                 {
 628                 struct target_pt_regs * _regs;
 629                 if(mach_hdr.filetype == MH_DYLINKER)
 630                     _regs = regs;
 631                 else
 632                     _regs = 0;
 633                 entry_point = load_thread( &mach_hdr, (struct target_thread_command*)lc, _regs, fd, mach_hdr_pos, need_bswap );
 634                 }
 635                 break;
 636             case LC_SYMTAB:
 637                 /* Save the symtab and strtab */
 638                 symtabcmd = (struct symtab_command *)lc;
 639                 break;
 640             case LC_ID_DYLINKER:
 641             case LC_ID_DYLIB:
 642             case LC_UUID:
 643             case LC_DYSYMTAB:
 644             case LC_TWOLEVEL_HINTS:
 645             case LC_PREBIND_CKSUM:
 646             case LC_SUB_LIBRARY:
 647                 break;
 648             default: fprintf(stderr, "warning: unkown command 0x%x in '%s'\n", lc->cmd, filename);
 649         }
 650         lc = (struct load_command*)((int)(lc)+(lc->cmdsize));
 651     }
 652
 653     if(symtabcmd)
 654     {
 655         if(need_bswap)
 656             bswap_symtabcmd(symtabcmd);
 657
 658         symtab_std = load_data(fd, symtabcmd->symoff+mach_hdr_pos, symtabcmd->nsyms * sizeof(struct nlist));
 659         strtab = load_data(fd, symtabcmd->stroff+mach_hdr_pos, symtabcmd->strsize);
 660
 661         symtab = malloc(sizeof(struct nlist_extended) * symtabcmd->nsyms);
 662
 663         if(need_bswap)
 664         {
 665             for(i = 0, syment = symtab_std; i < symtabcmd->nsyms; i++, syment++)
 666                 bswap_sym(syment);
 667         }
 668
 669         for(i = 0, sym = symtab, syment = symtab_std; i < symtabcmd->nsyms; i++, sym++, syment++)
 670         {
 671             struct nlist *sym_follow, *sym_next = 0;
 672             unsigned int j;
 673             memset(sym, 0, sizeof(*sym));
 674
 675             sym->n_type = syment->n_type;
 676             if ( syment->n_type & N_STAB ) /* Debug symbols are skipped */
 677                 continue;
 678
 679             memcpy(sym, syment, sizeof(*syment));
 680
 681             /* Find the following symbol in order to get the current symbol size */
 682             for(j = 0, sym_follow = symtab_std; j < symtabcmd->nsyms; j++, sym_follow++) {
 683                 if ( sym_follow->n_type & N_STAB || !(sym_follow->n_value > sym->st_value))
 684                     continue;
 685                 if(!sym_next) {
 686                     sym_next = sym_follow;
 687                     continue;
 688                 }
 689                 if(!(sym_next->n_value > sym_follow->n_value))
 690                     continue;
 691                 sym_next = sym_follow;
 692             }
 693             if(sym_next)
 694                 sym->st_size = sym_next->n_value - sym->st_value;
 695             else
 696                 sym->st_size = 10; /* XXX: text_sec_hdr->size + text_sec_hdr->offset - sym->st_value; */
 697
 698             sym->st_value += slide;
 699         }
 700
 701         free((void*)symtab_std);
 702
 703         {
 704             DPRINTF("saving symtab of %s (%d symbol(s))\n", filename, symtabcmd->nsyms);
 705             struct syminfo *s;
 706             s = malloc(sizeof(*s));
 707             s->disas_symtab = symtab;
 708             s->disas_strtab = strtab;
 709             s->disas_num_syms = symtabcmd->nsyms;
 710             s->next = syminfos;
 711             syminfos = s;
 712         }
 713     }
 714     close(fd);
 715     if(mach_hdr.filetype == MH_EXECUTE && dyld_entry_point)
 716         return dyld_entry_point;
 717     else
 718         return entry_point+slide;
 719 }
 720
 721 extern unsigned long stack_size;
 722
 723 unsigned long setup_arg_pages(void * mh, char ** argv, char ** env)
 724 {
 725     unsigned long stack_base, error, size;
 726     int i;
 727     int * stack;
 728     int argc, envc;
 729
 730     /* Create enough stack to hold everything.  If we don't use
 731      * it for args, we'll use it for something else...
 732      */
 733     size = stack_size;
 734
 735     error = target_mmap(0,
 736                         size + qemu_host_page_size,
 737                         PROT_READ | PROT_WRITE,
 738                         MAP_PRIVATE | MAP_ANONYMOUS,
 739                         -1, 0);
 740     if (error == -1)
 741         qerror("stk mmap");
 742
 743     /* we reserve one extra page at the top of the stack as guard */
 744     target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
 745
 746     stack_base = error + size;
 747     stack = (void*)stack_base;
 748 /*
 749  *    | STRING AREA |
 750  *    +-------------+
 751  *    |      0      |
 752 *    +-------------+
 753  *    |  apple[n]   |
 754  *    +-------------+
 755  *           :
 756  *    +-------------+
 757  *    |  apple[0]   |
 758  *    +-------------+
 759  *    |      0      |
 760  *    +-------------+
 761  *    |    env[n]   |
 762  *    +-------------+
 763  *           :
 764  *           :
 765  *    +-------------+
 766  *    |    env[0]   |
 767  *    +-------------+
 768  *    |      0      |
 769  *    +-------------+
 770  *    | arg[argc-1] |
 771  *    +-------------+
 772  *           :
 773  *           :
 774  *    +-------------+
 775  *    |    arg[0]   |
 776  *    +-------------+
 777  *    |     argc    |
 778  *    +-------------+
 779  * sp->    |      mh     | address of where the a.out's file offset 0 is in memory
 780  *    +-------------+
 781 */
 782     /* Construct the stack Stack grows down */
 783     stack--;
 784
 785     /* XXX: string should go up there */
 786
 787     *stack = 0;
 788     stack--;
 789
 790     /* Push the absolute path of our executable */
 791     DPRINTF("pushing apple %s (0x%x)\n", (char*)argv[0], (int)argv[0]);
 792     stl(stack, (int) argv[0]);
 793
 794     stack--;
 795
 796     stl(stack, 0);
 797     stack--;
 798
 799     /* Get envc */
 800     for(envc = 0; env[envc]; envc++);
 801
 802     for(i = envc-1; i >= 0; i--)
 803     {
 804         DPRINTF("pushing env %s (0x%x)\n", (char*)env[i], (int)env[i]);
 805         stl(stack, (int)env[i]);
 806         stack--;
 807
 808         /* XXX: remove that when string will be on top of the stack */
 809         page_set_flags((int)env[i], (int)(env[i]+strlen(env[i])), PROT_READ | PAGE_VALID);
 810     }
 811
 812     /* Add on the stack the interp_prefix choosen if so */
 813     if(interp_prefix[0])
 814     {
 815         char *dyld_root;
 816         asprintf(&dyld_root, "DYLD_ROOT_PATH=%s", interp_prefix);
 817         page_set_flags((int)dyld_root, (int)(dyld_root+strlen(interp_prefix)+1), PROT_READ | PAGE_VALID);
 818
 819         stl(stack, (int)dyld_root);
 820         stack--;
 821     }
 822
 823 #ifdef DONT_USE_DYLD_SHARED_MAP
 824     {
 825         char *shared_map_mode;
 826         asprintf(&shared_map_mode, "DYLD_SHARED_REGION=avoid");
 827         page_set_flags((int)shared_map_mode, (int)(shared_map_mode+strlen(shared_map_mode)+1), PROT_READ | PAGE_VALID);
 828
 829         stl(stack, (int)shared_map_mode);
 830         stack--;
 831     }
 832 #endif
 833
 834 #ifdef ACTIVATE_DYLD_TRACE
 835     char * extra_env_static[] = {"DYLD_DEBUG_TRACE=yes",
 836     "DYLD_PREBIND_DEBUG=3", "DYLD_UNKNOW_TRACE=yes",
 837     "DYLD_PRINT_INITIALIZERS=yes",
 838     "DYLD_PRINT_SEGMENTS=yes", "DYLD_PRINT_REBASINGS=yes", "DYLD_PRINT_BINDINGS=yes", "DYLD_PRINT_INITIALIZERS=yes", "DYLD_PRINT_WARNINGS=yes" };
 839
 840     char ** extra_env = malloc(sizeof(extra_env_static));
 841     bcopy(extra_env_static, extra_env, sizeof(extra_env_static));
 842     page_set_flags((int)extra_env, (int)((void*)extra_env+sizeof(extra_env_static)), PROT_READ | PAGE_VALID);
 843
 844     for(i = 0; i<9; i++)
 845     {
 846         DPRINTF("pushing (extra) env %s (0x%x)\n", (char*)extra_env[i], (int)extra_env[i]);
 847         stl(stack, (int) extra_env[i]);
 848         stack--;
 849     }
 850 #endif
 851
 852     stl(stack, 0);
 853     stack--;
 854
 855     /* Get argc */
 856     for(argc = 0; argv[argc]; argc++);
 857
 858     for(i = argc-1; i >= 0; i--)
 859     {
 860         DPRINTF("pushing arg %s (0x%x)\n", (char*)argv[i], (int)argv[i]);
 861         stl(stack, (int) argv[i]);
 862         stack--;
 863
 864         /* XXX: remove that when string will be on top of the stack */
 865         page_set_flags((int)argv[i], (int)(argv[i]+strlen(argv[i])), PROT_READ | PAGE_VALID);
 866     }
 867
 868     DPRINTF("pushing argc %d \n", argc);
 869     stl(stack, argc);
 870     stack--;
 871
 872     DPRINTF("pushing mh 0x%x \n", (int)mh);
 873     stl(stack, (int) mh);
 874
 875     /* Stack points on the mh */
 876     return (unsigned long)stack;
 877 }
 878
 879 int mach_exec(const char * filename, char ** argv, char ** envp,
 880              struct target_pt_regs * regs)
 881 {
 882     int entrypoint, stack;
 883     void * mh; /* the Mach Header that will be  used by dyld */
 884
 885     DPRINTF("mach_exec at 0x%x\n", (int)mach_exec);
 886
 887     entrypoint = load_object(filename, regs, &mh);
 888     stack = setup_arg_pages(mh, argv, envp);
 889 #if defined(TARGET_I386)
 890     regs->eip = entrypoint;
 891     regs->esp = stack;
 892 #elif defined(TARGET_PPC)
 893     regs->nip = entrypoint;
 894     regs->gpr[1] = stack;
 895 #endif
 896     DPRINTF("mach_exec returns eip set to 0x%x esp 0x%x mh 0x%x\n", entrypoint, stack, (int)mh);
 897
 898     if(!entrypoint)
 899         qerror("%s: no entry point!\n", filename);
 900
 901     return 0;
 902 }