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1.1 root 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 { if(loglevel) fprintf(logfile, __VA_ARGS__); printf(__VA_ARGS__); } while(0)
43: #else
44: # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __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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