File:  [Qemu by Fabrice Bellard] / qemu / darwin-user / machload.c
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:55:07 2018 UTC (3 years, 3 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

    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, write to the Free Software
   18:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
   19:  */
   20: #include <stdio.h>
   21: #include <sys/types.h>
   22: #include <fcntl.h>
   23: #include <sys/stat.h>
   24: #include <errno.h>
   25: #include <unistd.h>
   26: #include <sys/mman.h>
   27: #include <stdlib.h>
   28: #include <string.h>
   29: 
   30: #include "qemu.h"
   31: #include "disas.h"
   32: 
   33: #include <mach-o/loader.h>
   34: #include <mach-o/fat.h>
   35: #include <mach-o/nlist.h>
   36: #include <mach-o/reloc.h>
   37: #include <mach-o/ppc/reloc.h>
   38: 
   39: //#define DEBUG_MACHLOAD
   40: 
   41: #ifdef DEBUG_MACHLOAD
   42: # define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
   43: #else
   44: # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
   45: #endif
   46: 
   47: # define check_mach_header(x) (x.magic == MH_CIGAM)
   48: 
   49: extern const char *interp_prefix;
   50: 
   51: /* we don't have a good implementation for this */
   52: #define DONT_USE_DYLD_SHARED_MAP
   53: 
   54: /* Pass extra arg to DYLD for debug */
   55: //#define ACTIVATE_DYLD_TRACE
   56: 
   57: //#define OVERRIDE_DYLINKER
   58: 
   59: #ifdef OVERRIDE_DYLINKER
   60: # ifdef TARGET_I386
   61: #  define DYLINKER_NAME "/Users/steg/qemu/tests/i386-darwin-env/usr/lib/dyld"
   62: # else
   63: #  define DYLINKER_NAME "/usr/lib/dyld"
   64: # endif
   65: #endif
   66: 
   67: /* XXX: in an include */
   68: struct nlist_extended
   69: {
   70:     union {
   71:         char *n_name;
   72:         long  n_strx;
   73:     } n_un;
   74:     unsigned char n_type;
   75:     unsigned char n_sect;
   76:     short st_desc;
   77:     unsigned long st_value;
   78:     unsigned long st_size;
   79: };
   80: 
   81: /* Print symbols in gdb */
   82: void *macho_text_sect = 0;
   83: int   macho_offset = 0;
   84: 
   85: int load_object(const char *filename, struct target_pt_regs * regs, void ** mh);
   86: void qerror(const char *format, ...);
   87: #ifdef TARGET_I386
   88: typedef struct mach_i386_thread_state {
   89:     unsigned int    eax;
   90:     unsigned int    ebx;
   91:     unsigned int    ecx;
   92:     unsigned int    edx;
   93:     unsigned int    edi;
   94:     unsigned int    esi;
   95:     unsigned int    ebp;
   96:     unsigned int    esp;
   97:     unsigned int    ss;
   98:     unsigned int    eflags;
   99:     unsigned int    eip;
  100:     unsigned int    cs;
  101:     unsigned int    ds;
  102:     unsigned int    es;
  103:     unsigned int    fs;
  104:     unsigned int    gs;
  105: } mach_i386_thread_state_t;
  106: 
  107: void bswap_i386_thread_state(struct mach_i386_thread_state *ts)
  108: {
  109:     bswap32s((uint32_t*)&ts->eax);
  110:     bswap32s((uint32_t*)&ts->ebx);
  111:     bswap32s((uint32_t*)&ts->ecx);
  112:     bswap32s((uint32_t*)&ts->edx);
  113:     bswap32s((uint32_t*)&ts->edi);
  114:     bswap32s((uint32_t*)&ts->esi);
  115:     bswap32s((uint32_t*)&ts->ebp);
  116:     bswap32s((uint32_t*)&ts->esp);
  117:     bswap32s((uint32_t*)&ts->ss);
  118:     bswap32s((uint32_t*)&ts->eflags);
  119:     bswap32s((uint32_t*)&ts->eip);
  120:     bswap32s((uint32_t*)&ts->cs);
  121:     bswap32s((uint32_t*)&ts->ds);
  122:     bswap32s((uint32_t*)&ts->es);
  123:     bswap32s((uint32_t*)&ts->fs);
  124:     bswap32s((uint32_t*)&ts->gs);
  125: }
  126: #define target_thread_state mach_i386_thread_state
  127: #define TARGET_CPU_TYPE CPU_TYPE_I386
  128: #define TARGET_CPU_NAME "i386"
  129: #endif
  130: 
  131: #ifdef TARGET_PPC
  132: struct mach_ppc_thread_state {
  133:     unsigned int srr0;      /* Instruction address register (PC) */
  134:     unsigned int srr1;    /* Machine state register (supervisor) */
  135:     unsigned int r0;
  136:     unsigned int r1;
  137:     unsigned int r2;
  138:     unsigned int r3;
  139:     unsigned int r4;
  140:     unsigned int r5;
  141:     unsigned int r6;
  142:     unsigned int r7;
  143:     unsigned int r8;
  144:     unsigned int r9;
  145:     unsigned int r10;
  146:     unsigned int r11;
  147:     unsigned int r12;
  148:     unsigned int r13;
  149:     unsigned int r14;
  150:     unsigned int r15;
  151:     unsigned int r16;
  152:     unsigned int r17;
  153:     unsigned int r18;
  154:     unsigned int r19;
  155:     unsigned int r20;
  156:     unsigned int r21;
  157:     unsigned int r22;
  158:     unsigned int r23;
  159:     unsigned int r24;
  160:     unsigned int r25;
  161:     unsigned int r26;
  162:     unsigned int r27;
  163:     unsigned int r28;
  164:     unsigned int r29;
  165:     unsigned int r30;
  166:     unsigned int r31;
  167: 
  168:     unsigned int cr;        /* Condition register */
  169:     unsigned int xer;    /* User's integer exception register */
  170:     unsigned int lr;    /* Link register */
  171:     unsigned int ctr;    /* Count register */
  172:     unsigned int mq;    /* MQ register (601 only) */
  173: 
  174:     unsigned int vrsave;    /* Vector Save Register */
  175: };
  176: 
  177: void bswap_ppc_thread_state(struct mach_ppc_thread_state *ts)
  178: {
  179:     bswap32s((uint32_t*)&ts->srr0);
  180:     bswap32s((uint32_t*)&ts->srr1);
  181:     bswap32s((uint32_t*)&ts->r0);
  182:     bswap32s((uint32_t*)&ts->r1);
  183:     bswap32s((uint32_t*)&ts->r2);
  184:     bswap32s((uint32_t*)&ts->r3);
  185:     bswap32s((uint32_t*)&ts->r4);
  186:     bswap32s((uint32_t*)&ts->r5);
  187:     bswap32s((uint32_t*)&ts->r6);
  188:     bswap32s((uint32_t*)&ts->r7);
  189:     bswap32s((uint32_t*)&ts->r8);
  190:     bswap32s((uint32_t*)&ts->r9);
  191:     bswap32s((uint32_t*)&ts->r10);
  192:     bswap32s((uint32_t*)&ts->r11);
  193:     bswap32s((uint32_t*)&ts->r12);
  194:     bswap32s((uint32_t*)&ts->r13);
  195:     bswap32s((uint32_t*)&ts->r14);
  196:     bswap32s((uint32_t*)&ts->r15);
  197:     bswap32s((uint32_t*)&ts->r16);
  198:     bswap32s((uint32_t*)&ts->r17);
  199:     bswap32s((uint32_t*)&ts->r18);
  200:     bswap32s((uint32_t*)&ts->r19);
  201:     bswap32s((uint32_t*)&ts->r20);
  202:     bswap32s((uint32_t*)&ts->r21);
  203:     bswap32s((uint32_t*)&ts->r22);
  204:     bswap32s((uint32_t*)&ts->r23);
  205:     bswap32s((uint32_t*)&ts->r24);
  206:     bswap32s((uint32_t*)&ts->r25);
  207:     bswap32s((uint32_t*)&ts->r26);
  208:     bswap32s((uint32_t*)&ts->r27);
  209:     bswap32s((uint32_t*)&ts->r28);
  210:     bswap32s((uint32_t*)&ts->r29);
  211:     bswap32s((uint32_t*)&ts->r30);
  212:     bswap32s((uint32_t*)&ts->r31);
  213: 
  214:     bswap32s((uint32_t*)&ts->cr);
  215:     bswap32s((uint32_t*)&ts->xer);
  216:     bswap32s((uint32_t*)&ts->lr);
  217:     bswap32s((uint32_t*)&ts->ctr);
  218:     bswap32s((uint32_t*)&ts->mq);
  219: 
  220:     bswap32s((uint32_t*)&ts->vrsave);
  221: }
  222: 
  223: #define target_thread_state mach_ppc_thread_state
  224: #define TARGET_CPU_TYPE CPU_TYPE_POWERPC
  225: #define TARGET_CPU_NAME "PowerPC"
  226: #endif
  227: 
  228: struct target_thread_command {
  229:     unsigned long    cmd;    /* LC_THREAD or  LC_UNIXTHREAD */
  230:     unsigned long    cmdsize;    /* total size of this command */
  231:     unsigned long flavor;    /* flavor of thread state */
  232:     unsigned long count;        /* count of longs in thread state */
  233:     struct target_thread_state state;  /* thread state for this flavor */
  234: };
  235: 
  236: void bswap_tc(struct target_thread_command *tc)
  237: {
  238:     bswap32s((uint32_t*)(&tc->flavor));
  239:     bswap32s((uint32_t*)&tc->count);
  240: #if defined(TARGET_I386)
  241:     bswap_i386_thread_state(&tc->state);
  242: #elif defined(TARGET_PPC)
  243:     bswap_ppc_thread_state(&tc->state);
  244: #else
  245: # error unknown TARGET_CPU_TYPE
  246: #endif
  247: }
  248: 
  249: void bswap_mh(struct mach_header *mh)
  250: {
  251:     bswap32s((uint32_t*)(&mh->magic));
  252:     bswap32s((uint32_t*)&mh->cputype);
  253:     bswap32s((uint32_t*)&mh->cpusubtype);
  254:     bswap32s((uint32_t*)&mh->filetype);
  255:     bswap32s((uint32_t*)&mh->ncmds);
  256:     bswap32s((uint32_t*)&mh->sizeofcmds);
  257:     bswap32s((uint32_t*)&mh->flags);
  258: }
  259: 
  260: void bswap_lc(struct load_command *lc)
  261: {
  262:     bswap32s((uint32_t*)&lc->cmd);
  263:     bswap32s((uint32_t*)&lc->cmdsize);
  264: }
  265: 
  266: 
  267: void bswap_fh(struct fat_header *fh)
  268: {
  269:     bswap32s((uint32_t*)&fh->magic);
  270:     bswap32s((uint32_t*)&fh->nfat_arch);
  271: }
  272: 
  273: void bswap_fa(struct fat_arch *fa)
  274: {
  275:     bswap32s((uint32_t*)&fa->cputype);
  276:     bswap32s((uint32_t*)&fa->cpusubtype);
  277:     bswap32s((uint32_t*)&fa->offset);
  278:     bswap32s((uint32_t*)&fa->size);
  279:     bswap32s((uint32_t*)&fa->align);
  280: }
  281: 
  282: void bswap_segcmd(struct segment_command *sc)
  283: {
  284:     bswap32s((uint32_t*)&sc->vmaddr);
  285:     bswap32s((uint32_t*)&sc->vmsize);
  286:     bswap32s((uint32_t*)&sc->fileoff);
  287:     bswap32s((uint32_t*)&sc->filesize);
  288:     bswap32s((uint32_t*)&sc->maxprot);
  289:     bswap32s((uint32_t*)&sc->initprot);
  290:     bswap32s((uint32_t*)&sc->nsects);
  291:     bswap32s((uint32_t*)&sc->flags);
  292: }
  293: 
  294: void bswap_symtabcmd(struct symtab_command *stc)
  295: {
  296:     bswap32s((uint32_t*)&stc->cmd);
  297:     bswap32s((uint32_t*)&stc->cmdsize);
  298:     bswap32s((uint32_t*)&stc->symoff);
  299:     bswap32s((uint32_t*)&stc->nsyms);
  300:     bswap32s((uint32_t*)&stc->stroff);
  301:     bswap32s((uint32_t*)&stc->strsize);
  302: }
  303: 
  304: void bswap_sym(struct nlist *n)
  305: {
  306:     bswap32s((uint32_t*)&n->n_un.n_strx);
  307:     bswap16s((uint16_t*)&n->n_desc);
  308:     bswap32s((uint32_t*)&n->n_value);
  309: }
  310: 
  311: 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)
  312: {
  313:     int entry;
  314:     if(need_bswap)
  315:         bswap_tc(tc);
  316: #if defined(TARGET_I386)
  317:     entry = tc->state.eip;
  318:     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",
  319:             tc->state.eax, tc->state.ebx, tc->state.ecx, tc->state.edx, tc->state.edi, tc->state.esi, tc->state.ebp,
  320:             tc->state.esp, tc->state.ss, tc->state.eflags, tc->state.eip, tc->state.cs, tc->state.ds, tc->state.es,
  321:             tc->state.fs, tc->state.gs );
  322: #define reg_copy(reg)   regs->reg = tc->state.reg
  323:     if(regs)
  324:     {
  325:         reg_copy(eax);
  326:         reg_copy(ebx);
  327:         reg_copy(ecx);
  328:         reg_copy(edx);
  329: 
  330:         reg_copy(edi);
  331:         reg_copy(esi);
  332: 
  333:         reg_copy(ebp);
  334:         reg_copy(esp);
  335: 
  336:         reg_copy(eflags);
  337:         reg_copy(eip);
  338:     /*
  339:         reg_copy(ss);
  340:         reg_copy(cs);
  341:         reg_copy(ds);
  342:         reg_copy(es);
  343:         reg_copy(fs);
  344:         reg_copy(gs);*/
  345:     }
  346: #undef reg_copy
  347: #elif defined(TARGET_PPC)
  348:     entry =  tc->state.srr0;
  349: #endif
  350:     DPRINTF("load_thread: entry 0x%x\n", entry);
  351:     return entry;
  352: }
  353: 
  354: int load_dylinker(struct mach_header *mh, struct dylinker_command *dc, int fd, int mh_pos, int need_bswap)
  355: {
  356:     int size;
  357:     char * dylinker_name;
  358:     size = dc->cmdsize - sizeof(struct dylinker_command);
  359: 
  360:     if(need_bswap)
  361:         dylinker_name = (char*)(bswap_32(dc->name.offset)+(int)dc);
  362:     else
  363:         dylinker_name = (char*)((dc->name.offset)+(int)dc);
  364: 
  365: #ifdef OVERRIDE_DYLINKER
  366:     dylinker_name = DYLINKER_NAME;
  367: #else
  368:     if(asprintf(&dylinker_name, "%s%s", interp_prefix, dylinker_name) == -1)
  369:         qerror("can't allocate the new dylinker name\n");
  370: #endif
  371: 
  372:     DPRINTF("dylinker_name %s\n", dylinker_name);
  373:     return load_object(dylinker_name, NULL, NULL);
  374: }
  375: 
  376: int load_segment(struct mach_header *mh, struct segment_command *sc, int fd, int mh_pos, int need_bswap, int fixed, int slide)
  377: {
  378:     unsigned long addr = sc->vmaddr;
  379:     unsigned long size = sc->filesize;
  380:     unsigned long error = 0;
  381: 
  382:     if(need_bswap)
  383:         bswap_segcmd(sc);
  384: 
  385:     if(sc->vmaddr == 0)
  386:     {
  387:         DPRINTF("load_segment: sc->vmaddr == 0 returning\n");
  388:         return -1;
  389:     }
  390: 
  391:     if (strcmp(sc->segname, "__PAGEZERO") == 0)
  392:     {
  393:         DPRINTF("load_segment: __PAGEZERO returning\n");
  394:         return -1;
  395:     }
  396: 
  397:     /* Right now mmap memory */
  398:     /* XXX: should check to see that the space is free, because MAP_FIXED is dangerous */
  399:     DPRINTF("load_segment: mmaping %s to 0x%x-(0x%x|0x%x) + 0x%x\n", sc->segname, sc->vmaddr, sc->filesize, sc->vmsize, slide);
  400: 
  401:     if(sc->filesize > 0)
  402:     {
  403:         int opt = 0;
  404: 
  405:         if(fixed)
  406:             opt |= MAP_FIXED;
  407: 
  408:         DPRINTF("sc->vmaddr 0x%x slide 0x%x add 0x%x\n", slide, sc->vmaddr, sc->vmaddr+slide);
  409: 
  410:         addr = target_mmap(sc->vmaddr+slide, sc->filesize,  sc->initprot, opt, fd, mh_pos + sc->fileoff);
  411: 
  412:         if(addr==-1)
  413:             qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
  414: 
  415:         error = addr-sc->vmaddr;
  416:     }
  417:     else
  418:     {
  419:         addr = sc->vmaddr+slide;
  420:         error = slide;
  421:     }
  422: 
  423:     if(sc->vmsize > sc->filesize)
  424:     {
  425:         addr += sc->filesize;
  426:         size = sc->vmsize-sc->filesize;
  427:         addr = target_mmap(addr, size, sc->initprot, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
  428:         if(addr==-1)
  429:             qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
  430:     }
  431: 
  432:     return error;
  433: }
  434: 
  435: void *load_data(int fd, long offset, unsigned int size)
  436: {
  437:     char *data;
  438: 
  439:     data = malloc(size);
  440:     if (!data)
  441:         return NULL;
  442:     lseek(fd, offset, SEEK_SET);
  443:     if (read(fd, data, size) != size) {
  444:         free(data);
  445:         return NULL;
  446:     }
  447:     return data;
  448: }
  449: 
  450: /* load a mach-o object file */
  451: int load_object(const char *filename, struct target_pt_regs * regs, void ** mh)
  452: {
  453:     int need_bswap = 0;
  454:     int entry_point = 0;
  455:     int dyld_entry_point = 0;
  456:     int slide, mmapfixed;
  457:     int fd;
  458:     struct load_command *lcmds, *lc;
  459:     int is_fat = 0;
  460:     unsigned int i, magic;
  461:     int mach_hdr_pos = 0;
  462:     struct mach_header mach_hdr;
  463: 
  464:     /* for symbol lookup whith -d flag. */
  465:     struct symtab_command *    symtabcmd = 0;
  466:     struct nlist_extended *symtab, *sym;
  467:     struct nlist     *symtab_std, *syment;
  468:     char            *strtab;
  469: 
  470:     fd = open(filename, O_RDONLY);
  471:     if (fd < 0)
  472:         qerror("can't open file '%s'", filename);
  473: 
  474:     /* Read magic header.  */
  475:     if (read(fd, &magic, sizeof (magic)) != sizeof (magic))
  476:         qerror("unable to read Magic of '%s'", filename);
  477: 
  478:     /* Check Mach identification.  */
  479:     if(magic == MH_MAGIC)
  480:     {
  481:         is_fat = 0;
  482:         need_bswap = 0;
  483:     } else if (magic == MH_CIGAM)
  484:     {
  485:         is_fat = 0;
  486:         need_bswap = 1;
  487:     } else if (magic == FAT_MAGIC)
  488:     {
  489:         is_fat = 1;
  490:         need_bswap = 0;
  491:     } else if (magic == FAT_CIGAM)
  492:     {
  493:         is_fat = 1;
  494:         need_bswap = 1;
  495:     }
  496:     else
  497:         qerror("Not a Mach-O file.", filename);
  498: 
  499:     DPRINTF("loading %s %s...\n", filename, is_fat ? "[FAT]": "[REGULAR]");
  500:     if(is_fat)
  501:     {
  502:         int found = 0;
  503:         struct fat_header fh;
  504:         struct fat_arch *fa;
  505: 
  506:         lseek(fd, 0, SEEK_SET);
  507: 
  508:         /* Read Fat header.  */
  509:         if (read(fd, &fh, sizeof (fh)) != sizeof (fh))
  510:             qerror("unable to read file header");
  511: 
  512:         if(need_bswap)
  513:             bswap_fh(&fh);
  514: 
  515:         /* Read Fat Arch.  */
  516:         fa = malloc(sizeof(struct fat_arch)*fh.nfat_arch);
  517: 
  518:         if (read(fd, fa, sizeof(struct fat_arch)*fh.nfat_arch) != sizeof(struct fat_arch)*fh.nfat_arch)
  519:             qerror("unable to read file header");
  520: 
  521:         for( i = 0; i < fh.nfat_arch; i++, fa++)
  522:         {
  523:             if(need_bswap)
  524:                 bswap_fa(fa);
  525:             if(fa->cputype == TARGET_CPU_TYPE)
  526:             {
  527:                 mach_hdr_pos = fa->offset;
  528:                 lseek(fd, mach_hdr_pos, SEEK_SET);
  529: 
  530:                 /* Read Mach header.  */
  531: 
  532:                 if (read(fd, &mach_hdr, sizeof(struct mach_header)) != sizeof (struct mach_header))
  533:                     qerror("unable to read file header");
  534: 
  535:                 if(mach_hdr.magic == MH_MAGIC)
  536:                     need_bswap = 0;
  537:                 else if (mach_hdr.magic == MH_CIGAM)
  538:                     need_bswap = 1;
  539:                 else
  540:                     qerror("Invalid mach header in Fat Mach-O File");
  541:                 found = 1;
  542:                 break;
  543:             }
  544:         }
  545:         if(!found)
  546:             qerror("%s: No %s CPU found in FAT Header", filename, TARGET_CPU_NAME);
  547:     }
  548:     else
  549:     {
  550:         lseek(fd, 0, SEEK_SET);
  551:         /* Read Mach header */
  552:         if (read(fd, &mach_hdr, sizeof (mach_hdr)) != sizeof (mach_hdr))
  553:             qerror("%s: unable to read file header", filename);
  554:     }
  555: 
  556:     if(need_bswap)
  557:         bswap_mh(&mach_hdr);
  558: 
  559:     if ((mach_hdr.cputype) != TARGET_CPU_TYPE)
  560:         qerror("%s: Unsupported CPU 0x%x (only 0x%x(%s) supported)", filename, mach_hdr.cputype, TARGET_CPU_TYPE, TARGET_CPU_NAME);
  561: 
  562: 
  563:     switch(mach_hdr.filetype)
  564:     {
  565:         case MH_EXECUTE:  break;
  566:         case MH_FVMLIB:
  567:         case MH_DYLIB:
  568:         case MH_DYLINKER: break;
  569:         default:
  570:             qerror("%s: Unsupported Mach type (0x%x)", filename, mach_hdr.filetype);
  571:     }
  572: 
  573:     /* read segment headers */
  574:     lcmds = malloc(mach_hdr.sizeofcmds);
  575: 
  576:     if(read(fd, lcmds, mach_hdr.sizeofcmds) != mach_hdr.sizeofcmds)
  577:             qerror("%s: unable to read load_command", filename);
  578:     slide = 0;
  579:     mmapfixed = 0;
  580:     for(i=0, lc = lcmds; i < (mach_hdr.ncmds) ; i++)
  581:     {
  582: 
  583:         if(need_bswap)
  584:             bswap_lc(lc);
  585:         switch(lc->cmd)
  586:         {
  587:             case LC_SEGMENT:
  588:                 /* The main_exe can't be relocated */
  589:                 if(mach_hdr.filetype == MH_EXECUTE)
  590:                     mmapfixed = 1;
  591: 
  592:                 slide = load_segment(&mach_hdr, (struct segment_command*)lc, fd, mach_hdr_pos, need_bswap, mmapfixed, slide);
  593: 
  594:                 /* other segment must be mapped according to slide exactly, if load_segment did something */
  595:                 if(slide != -1)
  596:                     mmapfixed = 1;
  597:                 else
  598:                     slide = 0; /* load_segment didn't map the segment */
  599: 
  600:                 if(mach_hdr.filetype == MH_EXECUTE && slide != 0)
  601:                     qerror("%s: Warning executable can't be mapped at the right address (offset: 0x%x)\n", filename, slide);
  602: 
  603:                 if(strcmp(((struct segment_command*)(lc))->segname, "__TEXT") == 0)
  604:                 {
  605:                     /* Text section */
  606:                     if(mach_hdr.filetype == MH_EXECUTE)
  607:                     {
  608:                         /* return the mach_header */
  609:                         *mh = (void*)(((struct segment_command*)(lc))->vmaddr + slide);
  610:                     }
  611:                     else
  612:                     {
  613:                         /* it is dyld save the section for gdb, we will be interested in dyld symbol
  614:                            while debuging */
  615:                         macho_text_sect = (void*)(((struct segment_command*)(lc))->vmaddr + slide);
  616:                         macho_offset = slide;
  617:                     }
  618:                 }
  619:                 break;
  620:             case LC_LOAD_DYLINKER:
  621:                 dyld_entry_point = load_dylinker( &mach_hdr, (struct dylinker_command*)lc, fd, mach_hdr_pos, need_bswap );
  622:                 break;
  623:             case LC_LOAD_DYLIB:
  624:                 /* dyld will do that for us */
  625:                 break;
  626:             case LC_THREAD:
  627:             case LC_UNIXTHREAD:
  628:                 {
  629:                 struct target_pt_regs * _regs;
  630:                 if(mach_hdr.filetype == MH_DYLINKER)
  631:                     _regs = regs;
  632:                 else
  633:                     _regs = 0;
  634:                 entry_point = load_thread( &mach_hdr, (struct target_thread_command*)lc, _regs, fd, mach_hdr_pos, need_bswap );
  635:                 }
  636:                 break;
  637:             case LC_SYMTAB:
  638:                 /* Save the symtab and strtab */
  639:                 symtabcmd = (struct symtab_command *)lc;
  640:                 break;
  641:             case LC_ID_DYLINKER:
  642:             case LC_ID_DYLIB:
  643:             case LC_UUID:
  644:             case LC_DYSYMTAB:
  645:             case LC_TWOLEVEL_HINTS:
  646:             case LC_PREBIND_CKSUM:
  647:             case LC_SUB_LIBRARY:
  648:                 break;
  649:             default: fprintf(stderr, "warning: unkown command 0x%x in '%s'\n", lc->cmd, filename);
  650:         }
  651:         lc = (struct load_command*)((int)(lc)+(lc->cmdsize));
  652:     }
  653: 
  654:     if(symtabcmd)
  655:     {
  656:         if(need_bswap)
  657:             bswap_symtabcmd(symtabcmd);
  658: 
  659:         symtab_std = load_data(fd, symtabcmd->symoff+mach_hdr_pos, symtabcmd->nsyms * sizeof(struct nlist));
  660:         strtab = load_data(fd, symtabcmd->stroff+mach_hdr_pos, symtabcmd->strsize);
  661: 
  662:         symtab = malloc(sizeof(struct nlist_extended) * symtabcmd->nsyms);
  663: 
  664:         if(need_bswap)
  665:         {
  666:             for(i = 0, syment = symtab_std; i < symtabcmd->nsyms; i++, syment++)
  667:                 bswap_sym(syment);
  668:         }
  669: 
  670:         for(i = 0, sym = symtab, syment = symtab_std; i < symtabcmd->nsyms; i++, sym++, syment++)
  671:         {
  672:             struct nlist *sym_follow, *sym_next = 0;
  673:             unsigned int j;
  674:             memset(sym, 0, sizeof(*sym));
  675: 
  676:             sym->n_type = syment->n_type;
  677:             if ( syment->n_type & N_STAB ) /* Debug symbols are skipped */
  678:                 continue;
  679: 
  680:             memcpy(sym, syment, sizeof(*syment));
  681: 
  682:             /* Find the following symbol in order to get the current symbol size */
  683:             for(j = 0, sym_follow = symtab_std; j < symtabcmd->nsyms; j++, sym_follow++) {
  684:                 if ( sym_follow->n_type & N_STAB || !(sym_follow->n_value > sym->st_value))
  685:                     continue;
  686:                 if(!sym_next) {
  687:                     sym_next = sym_follow;
  688:                     continue;
  689:                 }
  690:                 if(!(sym_next->n_value > sym_follow->n_value))
  691:                     continue;
  692:                 sym_next = sym_follow;
  693:             }
  694:             if(sym_next)
  695:                 sym->st_size = sym_next->n_value - sym->st_value;
  696:             else
  697:                 sym->st_size = 10; /* XXX: text_sec_hdr->size + text_sec_hdr->offset - sym->st_value; */
  698: 
  699:             sym->st_value += slide;
  700:         }
  701: 
  702:         free((void*)symtab_std);
  703: 
  704:         {
  705:             DPRINTF("saving symtab of %s (%d symbol(s))\n", filename, symtabcmd->nsyms);
  706:             struct syminfo *s;
  707:             s = malloc(sizeof(*s));
  708:             s->disas_symtab = symtab;
  709:             s->disas_strtab = strtab;
  710:             s->disas_num_syms = symtabcmd->nsyms;
  711:             s->next = syminfos;
  712:             syminfos = s;
  713:         }
  714:     }
  715:     close(fd);
  716:     if(mach_hdr.filetype == MH_EXECUTE && dyld_entry_point)
  717:         return dyld_entry_point;
  718:     else
  719:         return entry_point+slide;
  720: }
  721: 
  722: extern unsigned long stack_size;
  723: 
  724: unsigned long setup_arg_pages(void * mh, char ** argv, char ** env)
  725: {
  726:     unsigned long stack_base, error, size;
  727:     int i;
  728:     int * stack;
  729:     int argc, envc;
  730: 
  731:     /* Create enough stack to hold everything.  If we don't use
  732:      * it for args, we'll use it for something else...
  733:      */
  734:     size = stack_size;
  735: 
  736:     error = target_mmap(0,
  737:                         size + qemu_host_page_size,
  738:                         PROT_READ | PROT_WRITE,
  739:                         MAP_PRIVATE | MAP_ANONYMOUS,
  740:                         -1, 0);
  741:     if (error == -1)
  742:         qerror("stk mmap");
  743: 
  744:     /* we reserve one extra page at the top of the stack as guard */
  745:     target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
  746: 
  747:     stack_base = error + size;
  748:     stack = (void*)stack_base;
  749: /*
  750:  *    | STRING AREA |
  751:  *    +-------------+
  752:  *    |      0      |
  753: *    +-------------+
  754:  *    |  apple[n]   |
  755:  *    +-------------+
  756:  *           :
  757:  *    +-------------+
  758:  *    |  apple[0]   |
  759:  *    +-------------+
  760:  *    |      0      |
  761:  *    +-------------+
  762:  *    |    env[n]   |
  763:  *    +-------------+
  764:  *           :
  765:  *           :
  766:  *    +-------------+
  767:  *    |    env[0]   |
  768:  *    +-------------+
  769:  *    |      0      |
  770:  *    +-------------+
  771:  *    | arg[argc-1] |
  772:  *    +-------------+
  773:  *           :
  774:  *           :
  775:  *    +-------------+
  776:  *    |    arg[0]   |
  777:  *    +-------------+
  778:  *    |     argc    |
  779:  *    +-------------+
  780:  * sp->    |      mh     | address of where the a.out's file offset 0 is in memory
  781:  *    +-------------+
  782: */
  783:     /* Construct the stack Stack grows down */
  784:     stack--;
  785: 
  786:     /* XXX: string should go up there */
  787: 
  788:     *stack = 0;
  789:     stack--;
  790: 
  791:     /* Push the absolute path of our executable */
  792:     DPRINTF("pushing apple %s (0x%x)\n", (char*)argv[0], (int)argv[0]);
  793:     stl(stack, (int) argv[0]);
  794: 
  795:     stack--;
  796: 
  797:     stl(stack, 0);
  798:     stack--;
  799: 
  800:     /* Get envc */
  801:     for(envc = 0; env[envc]; envc++);
  802: 
  803:     for(i = envc-1; i >= 0; i--)
  804:     {
  805:         DPRINTF("pushing env %s (0x%x)\n", (char*)env[i], (int)env[i]);
  806:         stl(stack, (int)env[i]);
  807:         stack--;
  808: 
  809:         /* XXX: remove that when string will be on top of the stack */
  810:         page_set_flags((int)env[i], (int)(env[i]+strlen(env[i])), PROT_READ | PAGE_VALID);
  811:     }
  812: 
  813:     /* Add on the stack the interp_prefix choosen if so */
  814:     if(interp_prefix[0])
  815:     {
  816:         char *dyld_root;
  817:         asprintf(&dyld_root, "DYLD_ROOT_PATH=%s", interp_prefix);
  818:         page_set_flags((int)dyld_root, (int)(dyld_root+strlen(interp_prefix)+1), PROT_READ | PAGE_VALID);
  819: 
  820:         stl(stack, (int)dyld_root);
  821:         stack--;
  822:     }
  823: 
  824: #ifdef DONT_USE_DYLD_SHARED_MAP
  825:     {
  826:         char *shared_map_mode;
  827:         asprintf(&shared_map_mode, "DYLD_SHARED_REGION=avoid");
  828:         page_set_flags((int)shared_map_mode, (int)(shared_map_mode+strlen(shared_map_mode)+1), PROT_READ | PAGE_VALID);
  829: 
  830:         stl(stack, (int)shared_map_mode);
  831:         stack--;
  832:     }
  833: #endif
  834: 
  835: #ifdef ACTIVATE_DYLD_TRACE
  836:     char * extra_env_static[] = {"DYLD_DEBUG_TRACE=yes",
  837:     "DYLD_PREBIND_DEBUG=3", "DYLD_UNKNOW_TRACE=yes",
  838:     "DYLD_PRINT_INITIALIZERS=yes",
  839:     "DYLD_PRINT_SEGMENTS=yes", "DYLD_PRINT_REBASINGS=yes", "DYLD_PRINT_BINDINGS=yes", "DYLD_PRINT_INITIALIZERS=yes", "DYLD_PRINT_WARNINGS=yes" };
  840: 
  841:     char ** extra_env = malloc(sizeof(extra_env_static));
  842:     bcopy(extra_env_static, extra_env, sizeof(extra_env_static));
  843:     page_set_flags((int)extra_env, (int)((void*)extra_env+sizeof(extra_env_static)), PROT_READ | PAGE_VALID);
  844: 
  845:     for(i = 0; i<9; i++)
  846:     {
  847:         DPRINTF("pushing (extra) env %s (0x%x)\n", (char*)extra_env[i], (int)extra_env[i]);
  848:         stl(stack, (int) extra_env[i]);
  849:         stack--;
  850:     }
  851: #endif
  852: 
  853:     stl(stack, 0);
  854:     stack--;
  855: 
  856:     /* Get argc */
  857:     for(argc = 0; argv[argc]; argc++);
  858: 
  859:     for(i = argc-1; i >= 0; i--)
  860:     {
  861:         DPRINTF("pushing arg %s (0x%x)\n", (char*)argv[i], (int)argv[i]);
  862:         stl(stack, (int) argv[i]);
  863:         stack--;
  864: 
  865:         /* XXX: remove that when string will be on top of the stack */
  866:         page_set_flags((int)argv[i], (int)(argv[i]+strlen(argv[i])), PROT_READ | PAGE_VALID);
  867:     }
  868: 
  869:     DPRINTF("pushing argc %d \n", argc);
  870:     stl(stack, argc);
  871:     stack--;
  872: 
  873:     DPRINTF("pushing mh 0x%x \n", (int)mh);
  874:     stl(stack, (int) mh);
  875: 
  876:     /* Stack points on the mh */
  877:     return (unsigned long)stack;
  878: }
  879: 
  880: int mach_exec(const char * filename, char ** argv, char ** envp,
  881:              struct target_pt_regs * regs)
  882: {
  883:     int entrypoint, stack;
  884:     void * mh; /* the Mach Header that will be  used by dyld */
  885: 
  886:     DPRINTF("mach_exec at 0x%x\n", (int)mach_exec);
  887: 
  888:     entrypoint = load_object(filename, regs, &mh);
  889:     stack = setup_arg_pages(mh, argv, envp);
  890: #if defined(TARGET_I386)
  891:     regs->eip = entrypoint;
  892:     regs->esp = stack;
  893: #elif defined(TARGET_PPC)
  894:     regs->nip = entrypoint;
  895:     regs->gpr[1] = stack;
  896: #endif
  897:     DPRINTF("mach_exec returns eip set to 0x%x esp 0x%x mh 0x%x\n", entrypoint, stack, (int)mh);
  898: 
  899:     if(!entrypoint)
  900:         qerror("%s: no entry point!\n", filename);
  901: 
  902:     return 0;
  903: }

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