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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 }
Qemu copy for testing