int need_bswap = 0;    int entry_point = 0;    int dyld_entry_point = 0;    int slide, mmapfixed;    int fd;    struct load_command *lcmds, *lc;    int is_fat = 0;    unsigned int i, magic;    int mach_hdr_pos = 0;    struct mach_header mach_hdr;    /* for symbol lookup whith -d flag. */    struct symtab_command *    symtabcmd = 0;    struct nlist_extended *symtab, *sym;    struct nlist     *symtab_std, *syment;    char            *strtab;    fd = open(filename, O_RDONLY);    if (fd < 0)        qerror("can't open file '%s'", filename);    /* Read magic header.  */    if (read(fd, &magic, sizeof (magic)) != sizeof (magic))        qerror("unable to read Magic of '%s'", filename);    /* Check Mach identification.  */    if(magic == MH_MAGIC)    {        is_fat = 0;        need_bswap = 0;    } else if (magic == MH_CIGAM)    {        is_fat = 0;        need_bswap = 1;    } else if (magic == FAT_MAGIC)    {        is_fat = 1;        need_bswap = 0;    } else if (magic == FAT_CIGAM)    {        is_fat = 1;        need_bswap = 1;    }    else        qerror("Not a Mach-O file.", filename);    DPRINTF("loading %s %s...\n", filename, is_fat ? "[FAT]": "[REGULAR]");    if(is_fat)    {        int found = 0;        struct fat_header fh;        struct fat_arch *fa;        lseek(fd, 0, SEEK_SET);        /* Read Fat header.  */        if (read(fd, &fh, sizeof (fh)) != sizeof (fh))            qerror("unable to read file header");        if(need_bswap)            bswap_fh(&fh);        /* Read Fat Arch.  */        fa = malloc(sizeof(struct fat_arch)*fh.nfat_arch);        if (read(fd, fa, sizeof(struct fat_arch)*fh.nfat_arch) != sizeof(struct fat_arch)*fh.nfat_arch)            qerror("unable to read file header");        for( i = 0; i < fh.nfat_arch; i++, fa++)        {            if(need_bswap)                bswap_fa(fa);            if(fa->cputype == TARGET_CPU_TYPE)            {                mach_hdr_pos = fa->offset;                lseek(fd, mach_hdr_pos, SEEK_SET);                /* Read Mach header.  */                if (read(fd, &mach_hdr, sizeof(struct mach_header)) != sizeof (struct mach_header))                    qerror("unable to read file header");                if(mach_hdr.magic == MH_MAGIC)                    need_bswap = 0;                else if (mach_hdr.magic == MH_CIGAM)                    need_bswap = 1;                else                    qerror("Invalid mach header in Fat Mach-O File");                found = 1;                break;            }        }        if(!found)            qerror("%s: No %s CPU found in FAT Header", filename, TARGET_CPU_NAME);    }    else    {        lseek(fd, 0, SEEK_SET);        /* Read Mach header */        if (read(fd, &mach_hdr, sizeof (mach_hdr)) != sizeof (mach_hdr))            qerror("%s: unable to read file header", filename);    }    if(need_bswap)        bswap_mh(&mach_hdr);    if ((mach_hdr.cputype) != TARGET_CPU_TYPE)        qerror("%s: Unsupported CPU 0x%x (only 0x%x(%s) supported)", filename, mach_hdr.cputype, TARGET_CPU_TYPE, TARGET_CPU_NAME);    switch(mach_hdr.filetype)    {        case MH_EXECUTE:  break;        case MH_FVMLIB:        case MH_DYLIB:        case MH_DYLINKER: break;        default:            qerror("%s: Unsupported Mach type (0x%x)", filename, mach_hdr.filetype);    }    /* read segment headers */    lcmds = malloc(mach_hdr.sizeofcmds);    if(read(fd, lcmds, mach_hdr.sizeofcmds) != mach_hdr.sizeofcmds)            qerror("%s: unable to read load_command", filename);    slide = 0;    mmapfixed = 0;    for(i=0, lc = lcmds; i < (mach_hdr.ncmds) ; i++)    {        if(need_bswap)            bswap_lc(lc);        switch(lc->cmd)        {            case LC_SEGMENT:                /* The main_exe can't be relocated */                if(mach_hdr.filetype == MH_EXECUTE)                    mmapfixed = 1;                slide = load_segment(&mach_hdr, (struct segment_command*)lc, fd, mach_hdr_pos, need_bswap, mmapfixed, slide);                /* other segment must be mapped according to slide exactly, if load_segment did something */                if(slide != -1)                    mmapfixed = 1;                else                    slide = 0; /* load_segment didn't map the segment */                if(mach_hdr.filetype == MH_EXECUTE && slide != 0)                    qerror("%s: Warning executable can't be mapped at the right address (offset: 0x%x)\n", filename, slide);                if(strcmp(((struct segment_command*)(lc))->segname, "__TEXT") == 0)                {                    /* Text section */                    if(mach_hdr.filetype == MH_EXECUTE)                    {                        /* return the mach_header */                        *mh = (void*)(((struct segment_command*)(lc))->vmaddr + slide);                    }                    else                    {                        /* it is dyld save the section for gdb, we will be interested in dyld symbol                           while debuging */                        macho_text_sect = (void*)(((struct segment_command*)(lc))->vmaddr + slide);                        macho_offset = slide;                    }                }                break;            case LC_LOAD_DYLINKER:                dyld_entry_point = load_dylinker( &mach_hdr, (struct dylinker_command*)lc, fd, mach_hdr_pos, need_bswap );                break;            case LC_LOAD_DYLIB:                /* dyld will do that for us */                break;            case LC_THREAD:            case LC_UNIXTHREAD:                {                struct target_pt_regs * _regs;                if(mach_hdr.filetype == MH_DYLINKER)                    _regs = regs;                else                    _regs = 0;                entry_point = load_thread( &mach_hdr, (struct target_thread_command*)lc, _regs, fd, mach_hdr_pos, need_bswap );                }                break;            case LC_SYMTAB:                /* Save the symtab and strtab */                symtabcmd = (struct symtab_command *)lc;                break;            case LC_ID_DYLINKER:            case LC_ID_DYLIB:            case LC_UUID:            case LC_DYSYMTAB:            case LC_TWOLEVEL_HINTS:            case LC_PREBIND_CKSUM:            case LC_SUB_LIBRARY:                break;            default: fprintf(stderr, "warning: unkown command 0x%x in '%s'\n", lc->cmd, filename);        }        lc = (struct load_command*)((int)(lc)+(lc->cmdsize));    }    if(symtabcmd)    {        if(need_bswap)            bswap_symtabcmd(symtabcmd);        symtab_std = load_data(fd, symtabcmd->symoff+mach_hdr_pos, symtabcmd->nsyms * sizeof(struct nlist));        strtab = load_data(fd, symtabcmd->stroff+mach_hdr_pos, symtabcmd->strsize);        symtab = malloc(sizeof(struct nlist_extended) * symtabcmd->nsyms);        if(need_bswap)        {            for(i = 0, syment = symtab_std; i < symtabcmd->nsyms; i++, syment++)                bswap_sym(syment);        }        for(i = 0, sym = symtab, syment = symtab_std; i < symtabcmd->nsyms; i++, sym++, syment++)        {            struct nlist *sym_follow, *sym_next = 0;            unsigned int j;            memset(sym, 0, sizeof(*sym));            sym->n_type = syment->n_type;            if ( syment->n_type & N_STAB ) /* Debug symbols are skipped */                continue;            memcpy(sym, syment, sizeof(*syment));            /* Find the following symbol in order to get the current symbol size */            for(j = 0, sym_follow = symtab_std; j < symtabcmd->nsyms; j++, sym_follow++) {                if ( sym_follow->n_type & N_STAB || !(sym_follow->n_value > sym->st_value))                    continue;                if(!sym_next) {                    sym_next = sym_follow;                    continue;                }                if(!(sym_next->n_value > sym_follow->n_value))                    continue;                sym_next = sym_follow;            }            if(sym_next)                sym->st_size = sym_next->n_value - sym->st_value;            else                sym->st_size = 10; /* XXX: text_sec_hdr->size + text_sec_hdr->offset - sym->st_value; */            sym->st_value += slide;        }        free((void*)symtab_std);        {            DPRINTF("saving symtab of %s (%d symbol(s))\n", filename, symtabcmd->nsyms);            struct syminfo *s;            s = malloc(sizeof(*s));            s->disas_symtab = symtab;            s->disas_strtab = strtab;            s->disas_num_syms = symtabcmd->nsyms;            s->next = syminfos;            syminfos = s;        }    }    close(fd);    if(mach_hdr.filetype == MH_EXECUTE && dyld_entry_point)        return dyld_entry_point;    else        return entry_point+slide;}extern unsigned long stack_size;unsigned long setup_arg_pages(void * mh, char ** argv, char ** env){    unsigned long stack_base, error, size;    int i;    int * stack;    int argc, envc;    /* Create enough stack to hold everything.  If we don't use     * it for args, we'll use it for something else...     */    size = stack_size;    error = target_mmap(0,                        size + qemu_host_page_size,                        PROT_READ | PROT_WRITE,                        MAP_PRIVATE | MAP_ANONYMOUS,                        -1, 0);    if (error == -1)        qerror("stk mmap");    /* we reserve one extra page at the top of the stack as guard */    target_mprotect(error + size, qemu_host_page_size, PROT_NONE);    stack_base = error + size;    stack = (void*)stack_base;/* *    | STRING AREA | *    +-------------+ *    |      0      |*    +-------------+ *    |  apple[n]   | *    +-------------+ *           : *    +-------------+ *    |  apple[0]   | *    +-------------+ *    |      0      | *    +-------------+ *    |    env[n]   | *    +-------------+ *           : *           : *    +-------------+ *    |    env[0]   | *    +-------------+ *    |      0      | *    +-------------+ *    | arg[argc-1] | *    +-------------+ *           : *           : *    +-------------+ *    |    arg[0]   | *    +-------------+ *    |     argc    | *    +-------------+ * sp->    |      mh     | address of where the a.out's file offset 0 is in memory *    +-------------+*/    /* Construct the stack Stack grows down */    stack--;    /* XXX: string should go up there */    *stack = 0;    stack--;    /* Push the absolute path of our executable */    DPRINTF("pushing apple %s (0x%x)\n", (char*)argv[0], (int)argv[0]);    stl(stack, (int) argv[0]);    stack--;    stl(stack, 0);    stack--;    /* Get envc */    for(envc = 0; env[envc]; envc++);    for(i = envc-1; i >= 0; i--)    {        DPRINTF("pushing env %s (0x%x)\n", (char*)env[i], (int)env[i]);        stl(stack, (int)env[i]);        stack--;        /* XXX: remove that when string will be on top of the stack */        page_set_flags((int)env[i], (int)(env[i]+strlen(env[i])), PROT_READ | PAGE_VALID);    }    /* Add on the stack the interp_prefix choosen if so */    if(interp_prefix[0])    {        char *dyld_root;        asprintf(&dyld_root, "DYLD_ROOT_PATH=%s", interp_prefix);        page_set_flags((int)dyld_root, (int)(dyld_root+strlen(interp_prefix)+1), PROT_READ | PAGE_VALID);        stl(stack, (int)dyld_root);        stack--;    }#ifdef DONT_USE_DYLD_SHARED_MAP    {        char *shared_map_mode;        asprintf(&shared_map_mode, "DYLD_SHARED_REGION=avoid");        page_set_flags((int)shared_map_mode, (int)(shared_map_mode+strlen(shared_map_mode)+1), PROT_READ | PAGE_VALID);        stl(stack, (int)shared_map_mode);        stack--;    }#endif#ifdef ACTIVATE_DYLD_TRACE    char * extra_env_static[] = {"DYLD_DEBUG_TRACE=yes",    "DYLD_PREBIND_DEBUG=3", "DYLD_UNKNOW_TRACE=yes",    "DYLD_PRINT_INITIALIZERS=yes",    "DYLD_PRINT_SEGMENTS=yes", "DYLD_PRINT_REBASINGS=yes", "DYLD_PRINT_BINDINGS=yes", "DYLD_PRINT_INITIALIZERS=yes", "DYLD_PRINT_WARNINGS=yes" };    char ** extra_env = malloc(sizeof(extra_env_static));    bcopy(extra_env_static, extra_env, sizeof(extra_env_static));    page_set_flags((int)extra_env, (int)((void*)extra_env+sizeof(extra_env_static)), PROT_READ | PAGE_VALID);    for(i = 0; i<9; i++)    {        DPRINTF("pushing (extra) env %s (0x%x)\n", (char*)extra_env[i], (int)extra_env[i]);        stl(stack, (int) extra_env[i]);        stack--;    }#endif    stl(stack, 0);    stack--;    /* Get argc */    for(argc = 0; argv[argc]; argc++);    for(i = argc-1; i >= 0; i--)    {        DPRINTF("pushing arg %s (0x%x)\n", (char*)argv[i], (int)argv[i]);        stl(stack, (int) argv[i]);        stack--;        /* XXX: remove that when string will be on top of the stack */        page_set_flags((int)argv[i], (int)(argv[i]+strlen(argv[i])), PROT_READ | PAGE_VALID);    }    DPRINTF("pushing argc %d \n", argc);    stl(stack, argc);    stack--;    DPRINTF("pushing mh 0x%x \n", (int)mh);    stl(stack, (int) mh);    /* Stack points on the mh */    return (unsigned long)stack;}int mach_exec(const char * filename, char ** argv, char ** envp,             struct target_pt_regs * regs){    int entrypoint, stack;    void * mh; /* the Mach Header that will be  used by dyld */    DPRINTF("mach_exec at 0x%x\n", (int)mach_exec);    entrypoint = load_object(filename, regs, &mh);    stack = setup_arg_pages(mh, argv, envp);#if defined(TARGET_I386)    regs->eip = entrypoint;    regs->esp = stack;#elif defined(TARGET_PPC)    regs->nip = entrypoint;    regs->gpr[1] = stack;#endif    DPRINTF("mach_exec returns eip set to 0x%x esp 0x%x mh 0x%x\n", entrypoint, stack, (int)mh);    if(!entrypoint)        qerror("%s: no entry point!\n", filename);    return 0;}