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1/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
2 *
3 * Copyright (c) 2008 Apple Inc. All rights reserved.
4 *
5 * @APPLE_LICENSE_HEADER_START@
6 *
7 * This file contains Original Code and/or Modifications of Original Code
8 * as defined in and that are subject to the Apple Public Source License
9 * Version 2.0 (the 'License'). You may not use this file except in
10 * compliance with the License. Please obtain a copy of the License at
11 * http://www.opensource.apple.com/apsl/ and read it before using this
12 * file.
13 *
14 * The Original Code and all software distributed under the License are
15 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
19 * Please see the License for the specific language governing rights and
20 * limitations under the License.
21 *
22 * @APPLE_LICENSE_HEADER_END@
23 */
24
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <sys/mman.h>
28#include <stdarg.h>
29#include <stdio.h>
30#include <fcntl.h>
31#include <unistd.h>
32#include <errno.h>
33
34#include <vector>
35#include <set>
36#include <ext/hash_set>
37
38
39#include "MachOFileAbstraction.hpp"
40#include "Architectures.hpp"
41
42
43 __attribute__((noreturn))
44void throwf(const char* format, ...)
45{
46 va_list list;
47 char* p;
48 va_start(list, format);
49 vasprintf(&p, format, list);
50 va_end(list);
51
52 const char* t = p;
53 throw t;
54}
55
56
57template <typename A>
58class UnwindPrinter
59{
60public:
61 static bool validFile(const uint8_t* fileContent);
62 static UnwindPrinter<A>* make(const uint8_t* fileContent, uint32_t fileLength,
63 const char* path, bool showFunctionNames)
64 { return new UnwindPrinter<A>(fileContent, fileLength,
65 path, showFunctionNames); }
66 virtual ~UnwindPrinter() {}
67
68
69private:
70 typedef typename A::P P;
71 typedef typename A::P::E E;
72 typedef typename A::P::uint_t pint_t;
73
74 class CStringEquals
75 {
76 public:
77 bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
78 };
79
80 typedef __gnu_cxx::hash_set<const char*, __gnu_cxx::hash<const char*>, CStringEquals> StringSet;
81
82 UnwindPrinter(const uint8_t* fileContent, uint32_t fileLength,
83 const char* path, bool showFunctionNames);
84 bool findUnwindSection();
85 void printUnwindSection(bool showFunctionNames);
86 void getSymbolTableInfo();
87 const char* functionName(pint_t addr);
88 static const char* archName();
89 static void decode(uint32_t encoding, const uint8_t* funcStart, char* str);
90
91 const char* fPath;
92 const macho_header<P>* fHeader;
93 uint64_t fLength;
94 const macho_section<P>* fUnwindSection;
95 const char* fStrings;
96 const char* fStringsEnd;
97 const macho_nlist<P>* fSymbols;
98 uint32_t fSymbolCount;
99 pint_t fMachHeaderAddress;
100};
101
102
103template <> const char* UnwindPrinter<ppc>::archName() { return "ppc"; }
104template <> const char* UnwindPrinter<ppc64>::archName() { return "ppc64"; }
105template <> const char* UnwindPrinter<x86>::archName() { return "i386"; }
106template <> const char* UnwindPrinter<x86_64>::archName() { return "x86_64"; }
107template <> const char* UnwindPrinter<arm>::archName() { return "arm"; }
108
109template <>
110bool UnwindPrinter<ppc>::validFile(const uint8_t* fileContent)
111{
112 const macho_header<P>* header = (const macho_header<P>*)fileContent;
113 if ( header->magic() != MH_MAGIC )
114 return false;
115 if ( header->cputype() != CPU_TYPE_POWERPC )
116 return false;
117 switch (header->filetype()) {
118 case MH_EXECUTE:
119 case MH_DYLIB:
120 case MH_BUNDLE:
121 case MH_DYLINKER:
122 return true;
123 }
124 return false;
125}
126
127template <>
128bool UnwindPrinter<ppc64>::validFile(const uint8_t* fileContent)
129{
130 const macho_header<P>* header = (const macho_header<P>*)fileContent;
131 if ( header->magic() != MH_MAGIC_64 )
132 return false;
133 if ( header->cputype() != CPU_TYPE_POWERPC64 )
134 return false;
135 switch (header->filetype()) {
136 case MH_EXECUTE:
137 case MH_DYLIB:
138 case MH_BUNDLE:
139 case MH_DYLINKER:
140 return true;
141 }
142 return false;
143}
144
145template <>
146bool UnwindPrinter<x86>::validFile(const uint8_t* fileContent)
147{
148 const macho_header<P>* header = (const macho_header<P>*)fileContent;
149 if ( header->magic() != MH_MAGIC )
150 return false;
151 if ( header->cputype() != CPU_TYPE_I386 )
152 return false;
153 switch (header->filetype()) {
154 case MH_EXECUTE:
155 case MH_DYLIB:
156 case MH_BUNDLE:
157 case MH_DYLINKER:
158 return true;
159 }
160 return false;
161}
162
163template <>
164bool UnwindPrinter<x86_64>::validFile(const uint8_t* fileContent)
165{
166 const macho_header<P>* header = (const macho_header<P>*)fileContent;
167 if ( header->magic() != MH_MAGIC_64 )
168 return false;
169 if ( header->cputype() != CPU_TYPE_X86_64 )
170 return false;
171 switch (header->filetype()) {
172 case MH_EXECUTE:
173 case MH_DYLIB:
174 case MH_BUNDLE:
175 case MH_DYLINKER:
176 return true;
177 }
178 return false;
179}
180
181template <>
182bool UnwindPrinter<arm>::validFile(const uint8_t* fileContent)
183{
184 const macho_header<P>* header = (const macho_header<P>*)fileContent;
185 if ( header->magic() != MH_MAGIC )
186 return false;
187 if ( header->cputype() != CPU_TYPE_ARM )
188 return false;
189 switch (header->filetype()) {
190 case MH_EXECUTE:
191 case MH_DYLIB:
192 case MH_BUNDLE:
193 case MH_DYLINKER:
194 return true;
195 }
196 return false;
197}
198
199
200template <typename A>
201UnwindPrinter<A>::UnwindPrinter(const uint8_t* fileContent, uint32_t fileLength, const char* path, bool showFunctionNames)
202 : fHeader(NULL), fLength(fileLength), fUnwindSection(NULL),
203 fStrings(NULL), fStringsEnd(NULL), fSymbols(NULL), fSymbolCount(0), fMachHeaderAddress(0)
204{
205 // sanity check
206 if ( ! validFile(fileContent) )
207 throw "not a mach-o file that can be checked";
208
209 fPath = strdup(path);
210 fHeader = (const macho_header<P>*)fileContent;
211
212 getSymbolTableInfo();
213
214 if ( findUnwindSection() )
215 printUnwindSection(showFunctionNames);
216}
217
218
219template <typename A>
220void UnwindPrinter<A>::getSymbolTableInfo()
221{
222 const uint8_t* const endOfFile = (uint8_t*)fHeader + fLength;
223 const uint8_t* const endOfLoadCommands = (uint8_t*)fHeader + sizeof(macho_header<P>) + fHeader->sizeofcmds();
224 const uint32_t cmd_count = fHeader->ncmds();
225 const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
226 const macho_load_command<P>* cmd = cmds;
227 for (uint32_t i = 0; i < cmd_count; ++i) {
228 uint32_t size = cmd->cmdsize();
229 const uint8_t* endOfCmd = ((uint8_t*)cmd)+cmd->cmdsize();
230 if ( endOfCmd > endOfLoadCommands )
231 throwf("load command #%d extends beyond the end of the load commands", i);
232 if ( endOfCmd > endOfFile )
233 throwf("load command #%d extends beyond the end of the file", i);
234 if ( cmd->cmd() == LC_SYMTAB) {
235 const macho_symtab_command<P>* symtab = (macho_symtab_command<P>*)cmd;
236 fSymbolCount = symtab->nsyms();
237 fSymbols = (const macho_nlist<P>*)((char*)fHeader + symtab->symoff());
238 fStrings = (char*)fHeader + symtab->stroff();
239 fStringsEnd = fStrings + symtab->strsize();
240 }
241 cmd = (const macho_load_command<P>*)endOfCmd;
242 }
243}
244
245template <typename A>
246const char* UnwindPrinter<A>::functionName(pint_t addr)
247{
248 for (uint32_t i=0; i < fSymbolCount; ++i) {
249 uint8_t type = fSymbols[i].n_type();
250 if ( ((type & N_STAB) == 0) && ((type & N_TYPE) == N_SECT) ) {
251 if ( fSymbols[i].n_value() == addr ) {
252 const char* r = &fStrings[fSymbols[i].n_strx()];
253 //fprintf(stderr, "addr=0x%08llX, i=%u, n_type=0x%0X, r=%s\n", (long long)(fSymbols[i].n_value()), i, fSymbols[i].n_type(), r);
254 return r;
255 }
256 }
257 }
258 return "--anonymous function--";
259}
260
261
262
263template <typename A>
264bool UnwindPrinter<A>::findUnwindSection()
265{
266 const uint8_t* const endOfFile = (uint8_t*)fHeader + fLength;
267 const uint8_t* const endOfLoadCommands = (uint8_t*)fHeader + sizeof(macho_header<P>) + fHeader->sizeofcmds();
268 const uint32_t cmd_count = fHeader->ncmds();
269 const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
270 const macho_load_command<P>* cmd = cmds;
271 for (uint32_t i = 0; i < cmd_count; ++i) {
272 uint32_t size = cmd->cmdsize();
273 const uint8_t* endOfCmd = ((uint8_t*)cmd)+cmd->cmdsize();
274 if ( endOfCmd > endOfLoadCommands )
275 throwf("load command #%d extends beyond the end of the load commands", i);
276 if ( endOfCmd > endOfFile )
277 throwf("load command #%d extends beyond the end of the file", i);
278 if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
279 const macho_segment_command<P>* segCmd = (const macho_segment_command<P>*)cmd;
280 const macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)segCmd + sizeof(macho_segment_command<P>));
281 const macho_section<P>* const sectionsEnd = &sectionsStart[segCmd->nsects()];
282 for(const macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
283 if ( (strcmp(sect->sectname(), "__unwind_info") == 0) && (strcmp(sect->segname(), "__TEXT") == 0) ) {
284 fUnwindSection = sect;
285 fMachHeaderAddress = segCmd->vmaddr();
286 return fUnwindSection;
287 }
288 }
289 }
290 cmd = (const macho_load_command<P>*)endOfCmd;
291 }
292 return false;
293}
294
295#define EXTRACT_BITS(value, mask) \
296 ( (value >> __builtin_ctz(mask)) & (((1 << __builtin_popcount(mask)))-1) )
297
298
299template <>
300void UnwindPrinter<x86_64>::decode(uint32_t encoding, const uint8_t* funcStart, char* str)
301{
302 *str = '\0';
303 switch ( encoding & UNWIND_X86_64_MODE_MASK ) {
304 case UNWIND_X86_64_MODE_RBP_FRAME:
305 {
306 uint32_t savedRegistersOffset = EXTRACT_BITS(encoding, UNWIND_X86_64_RBP_FRAME_OFFSET);
307 uint32_t savedRegistersLocations = EXTRACT_BITS(encoding, UNWIND_X86_64_RBP_FRAME_REGISTERS);
308 if ( savedRegistersLocations == 0 ) {
309 strcpy(str, "rbp frame, no saved registers");
310 }
311 else {
312 sprintf(str, "rbp frame, at -%d:", savedRegistersOffset*8);
313 bool needComma = false;
314 for (int i=0; i < 5; ++i) {
315 if ( needComma )
316 strcat(str, ",");
317 else
318 needComma = true;
319 switch (savedRegistersLocations & 0x7) {
320 case UNWIND_X86_64_REG_NONE:
321 strcat(str, "-");
322 break;
323 case UNWIND_X86_64_REG_RBX:
324 strcat(str, "rbx");
325 break;
326 case UNWIND_X86_64_REG_R12:
327 strcat(str, "r12");
328 break;
329 case UNWIND_X86_64_REG_R13:
330 strcat(str, "r13");
331 break;
332 case UNWIND_X86_64_REG_R14:
333 strcat(str, "r14");
334 break;
335 case UNWIND_X86_64_REG_R15:
336 strcat(str, "r15");
337 break;
338 default:
339 strcat(str, "r?");
340 }
341 savedRegistersLocations = (savedRegistersLocations >> 3);
342 if ( savedRegistersLocations == 0 )
343 break;
344 }
345 }
346 }
347 break;
348 case UNWIND_X86_64_MODE_STACK_IMMD:
349 case UNWIND_X86_64_MODE_STACK_IND:
350 {
351 uint32_t stackSize = EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_SIZE);
352 uint32_t stackAdjust = EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_ADJUST);
353 uint32_t regCount = EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT);
354 uint32_t permutation = EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION);
355 if ( (encoding & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_STACK_IND ) {
356 // stack size is encoded in subl $xxx,%esp instruction
357 uint32_t subl = x86_64::P::E::get32(*((uint32_t*)(funcStart+stackSize)));
358 sprintf(str, "stack size=0x%08X, ", subl + 8*stackAdjust);
359 }
360 else {
361 sprintf(str, "stack size=%d, ", stackSize*8);
362 }
363 if ( regCount == 0 ) {
364 strcat(str, "no registers saved");
365 }
366 else {
367 int permunreg[6];
368 switch ( regCount ) {
369 case 6:
370 permunreg[0] = permutation/120;
371 permutation -= (permunreg[0]*120);
372 permunreg[1] = permutation/24;
373 permutation -= (permunreg[1]*24);
374 permunreg[2] = permutation/6;
375 permutation -= (permunreg[2]*6);
376 permunreg[3] = permutation/2;
377 permutation -= (permunreg[3]*2);
378 permunreg[4] = permutation;
379 permunreg[5] = 0;
380 break;
381 case 5:
382 permunreg[0] = permutation/120;
383 permutation -= (permunreg[0]*120);
384 permunreg[1] = permutation/24;
385 permutation -= (permunreg[1]*24);
386 permunreg[2] = permutation/6;
387 permutation -= (permunreg[2]*6);
388 permunreg[3] = permutation/2;
389 permutation -= (permunreg[3]*2);
390 permunreg[4] = permutation;
391 break;
392 case 4:
393 permunreg[0] = permutation/60;
394 permutation -= (permunreg[0]*60);
395 permunreg[1] = permutation/12;
396 permutation -= (permunreg[1]*12);
397 permunreg[2] = permutation/3;
398 permutation -= (permunreg[2]*3);
399 permunreg[3] = permutation;
400 break;
401 case 3:
402 permunreg[0] = permutation/20;
403 permutation -= (permunreg[0]*20);
404 permunreg[1] = permutation/4;
405 permutation -= (permunreg[1]*4);
406 permunreg[2] = permutation;
407 break;
408 case 2:
409 permunreg[0] = permutation/5;
410 permutation -= (permunreg[0]*5);
411 permunreg[1] = permutation;
412 break;
413 case 1:
414 permunreg[0] = permutation;
415 break;
416 }
417 // renumber registers back to standard numbers
418 int registers[6];
419 bool used[7] = { false, false, false, false, false, false, false };
420 for (int i=0; i < regCount; ++i) {
421 int renum = 0;
422 for (int u=1; u < 7; ++u) {
423 if ( !used[u] ) {
424 if ( renum == permunreg[i] ) {
425 registers[i] = u;
426 used[u] = true;
427 break;
428 }
429 ++renum;
430 }
431 }
432 }
433 bool needComma = false;
434 for (int i=0; i < regCount; ++i) {
435 if ( needComma )
436 strcat(str, ",");
437 else
438 needComma = true;
439 switch ( registers[i] ) {
440 case UNWIND_X86_64_REG_RBX:
441 strcat(str, "rbx");
442 break;
443 case UNWIND_X86_64_REG_R12:
444 strcat(str, "r12");
445 break;
446 case UNWIND_X86_64_REG_R13:
447 strcat(str, "r13");
448 break;
449 case UNWIND_X86_64_REG_R14:
450 strcat(str, "r14");
451 break;
452 case UNWIND_X86_64_REG_R15:
453 strcat(str, "r15");
454 break;
455 case UNWIND_X86_64_REG_RBP:
456 strcat(str, "rbp");
457 break;
458 default:
459 strcat(str, "r??");
460 }
461 }
462 }
463 }
464 break;
465 case UNWIND_X86_64_MODE_DWARF:
466 sprintf(str, "dwarf offset 0x%08X, ", encoding & UNWIND_X86_64_DWARF_SECTION_OFFSET);
467 break;
468 default:
469 if ( encoding == 0 )
470 strcat(str, "no unwind information");
471 else
472 strcat(str, "tbd ");
473 }
474 if ( encoding & UNWIND_HAS_LSDA ) {
475 strcat(str, " LSDA");
476 }
477
478}
479
480template <>
481void UnwindPrinter<x86>::decode(uint32_t encoding, const uint8_t* funcStart, char* str)
482{
483 *str = '\0';
484 switch ( encoding & UNWIND_X86_MODE_MASK ) {
485 case UNWIND_X86_MODE_EBP_FRAME:
486 {
487 uint32_t savedRegistersOffset = EXTRACT_BITS(encoding, UNWIND_X86_EBP_FRAME_OFFSET);
488 uint32_t savedRegistersLocations = EXTRACT_BITS(encoding, UNWIND_X86_EBP_FRAME_REGISTERS);
489 if ( savedRegistersLocations == 0 ) {
490 strcpy(str, "ebp frame, no saved registers");
491 }
492 else {
493 sprintf(str, "ebp frame, at -%d:", savedRegistersOffset*4);
494 bool needComma = false;
495 for (int i=0; i < 5; ++i) {
496 if ( needComma )
497 strcat(str, ",");
498 else
499 needComma = true;
500 switch (savedRegistersLocations & 0x7) {
501 case UNWIND_X86_REG_NONE:
502 strcat(str, "-");
503 break;
504 case UNWIND_X86_REG_EBX:
505 strcat(str, "ebx");
506 break;
507 case UNWIND_X86_REG_ECX:
508 strcat(str, "ecx");
509 break;
510 case UNWIND_X86_REG_EDX:
511 strcat(str, "edx");
512 break;
513 case UNWIND_X86_REG_EDI:
514 strcat(str, "edi");
515 break;
516 case UNWIND_X86_REG_ESI:
517 strcat(str, "esi");
518 break;
519 default:
520 strcat(str, "e??");
521 }
522 savedRegistersLocations = (savedRegistersLocations >> 3);
523 if ( savedRegistersLocations == 0 )
524 break;
525 }
526 }
527 }
528 break;
529 case UNWIND_X86_MODE_STACK_IMMD:
530 case UNWIND_X86_MODE_STACK_IND:
531 {
532 uint32_t stackSize = EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_SIZE);
533 uint32_t stackAdjust = EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_ADJUST);
534 uint32_t regCount = EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_REG_COUNT);
535 uint32_t permutation = EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION);
536 if ( (encoding & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_STACK_IND ) {
537 // stack size is encoded in subl $xxx,%esp instruction
538 uint32_t subl = x86::P::E::get32(*((uint32_t*)(funcStart+stackSize)));
539 sprintf(str, "stack size=0x%08X, ", subl+4*stackAdjust);
540 }
541 else {
542 sprintf(str, "stack size=%d, ", stackSize*4);
543 }
544 if ( regCount == 0 ) {
545 strcat(str, "no saved regs");
546 }
547 else {
548 int permunreg[6];
549 switch ( regCount ) {
550 case 6:
551 permunreg[0] = permutation/120;
552 permutation -= (permunreg[0]*120);
553 permunreg[1] = permutation/24;
554 permutation -= (permunreg[1]*24);
555 permunreg[2] = permutation/6;
556 permutation -= (permunreg[2]*6);
557 permunreg[3] = permutation/2;
558 permutation -= (permunreg[3]*2);
559 permunreg[4] = permutation;
560 permunreg[5] = 0;
561 break;
562 case 5:
563 permunreg[0] = permutation/120;
564 permutation -= (permunreg[0]*120);
565 permunreg[1] = permutation/24;
566 permutation -= (permunreg[1]*24);
567 permunreg[2] = permutation/6;
568 permutation -= (permunreg[2]*6);
569 permunreg[3] = permutation/2;
570 permutation -= (permunreg[3]*2);
571 permunreg[4] = permutation;
572 break;
573 case 4:
574 permunreg[0] = permutation/60;
575 permutation -= (permunreg[0]*60);
576 permunreg[1] = permutation/12;
577 permutation -= (permunreg[1]*12);
578 permunreg[2] = permutation/3;
579 permutation -= (permunreg[2]*3);
580 permunreg[3] = permutation;
581 break;
582 case 3:
583 permunreg[0] = permutation/20;
584 permutation -= (permunreg[0]*20);
585 permunreg[1] = permutation/4;
586 permutation -= (permunreg[1]*4);
587 permunreg[2] = permutation;
588 break;
589 case 2:
590 permunreg[0] = permutation/5;
591 permutation -= (permunreg[0]*5);
592 permunreg[1] = permutation;
593 break;
594 case 1:
595 permunreg[0] = permutation;
596 break;
597 }
598 // renumber registers back to standard numbers
599 int registers[6];
600 bool used[7] = { false, false, false, false, false, false, false };
601 for (int i=0; i < regCount; ++i) {
602 int renum = 0;
603 for (int u=1; u < 7; ++u) {
604 if ( !used[u] ) {
605 if ( renum == permunreg[i] ) {
606 registers[i] = u;
607 used[u] = true;
608 break;
609 }
610 ++renum;
611 }
612 }
613 }
614 bool needComma = false;
615 for (int i=0; i < regCount; ++i) {
616 if ( needComma )
617 strcat(str, ",");
618 else
619 needComma = true;
620 switch ( registers[i] ) {
621 case UNWIND_X86_REG_EBX:
622 strcat(str, "ebx");
623 break;
624 case UNWIND_X86_REG_ECX:
625 strcat(str, "ecx");
626 break;
627 case UNWIND_X86_REG_EDX:
628 strcat(str, "edx");
629 break;
630 case UNWIND_X86_REG_EDI:
631 strcat(str, "edi");
632 break;
633 case UNWIND_X86_REG_ESI:
634 strcat(str, "esi");
635 break;
636 case UNWIND_X86_REG_EBP:
637 strcat(str, "ebp");
638 break;
639 default:
640 strcat(str, "e??");
641 }
642 }
643 }
644 }
645 break;
646 case UNWIND_X86_MODE_DWARF:
647 sprintf(str, "dwarf offset 0x%08X, ", encoding & UNWIND_X86_DWARF_SECTION_OFFSET);
648 break;
649 default:
650 if ( encoding == 0 )
651 strcat(str, "no unwind information");
652 else
653 strcat(str, "tbd ");
654 }
655 if ( encoding & UNWIND_HAS_LSDA ) {
656 strcat(str, " LSDA");
657 }
658
659}
660
661
662template <typename A>
663void UnwindPrinter<A>::decode(uint32_t encoding, const uint8_t* funcStart, char* str)
664{
665
666
667}
668
669template <typename A>
670void UnwindPrinter<A>::printUnwindSection(bool showFunctionNames)
671{
672 const uint8_t* sectionContent = (uint8_t*)fHeader + fUnwindSection->offset();
673 macho_unwind_info_section_header<P>* sectionHeader = (macho_unwind_info_section_header<P>*)(sectionContent);
674
675 printf("Arch: %s, Section: __TEXT,__unwind_info (addr=0x%08llX, size=0x%08llX, fileOffset=0x%08X)\n",
676 archName(), fUnwindSection->addr(), fUnwindSection->size(), fUnwindSection->offset());
677 printf("\tversion=0x%08X\n", sectionHeader->version());
678 printf("\tcommonEncodingsArraySectionOffset=0x%08X\n", sectionHeader->commonEncodingsArraySectionOffset());
679 printf("\tcommonEncodingsArrayCount=0x%08X\n", sectionHeader->commonEncodingsArrayCount());
680 printf("\tpersonalityArraySectionOffset=0x%08X\n", sectionHeader->personalityArraySectionOffset());
681 printf("\tpersonalityArrayCount=0x%08X\n", sectionHeader->personalityArrayCount());
682 printf("\tindexSectionOffset=0x%08X\n", sectionHeader->indexSectionOffset());
683 printf("\tindexCount=0x%08X\n", sectionHeader->indexCount());
684 printf("\tcommon encodings: (count=%u)\n", sectionHeader->commonEncodingsArrayCount());
685 const uint32_t* commonEncodings = (uint32_t*)&sectionContent[sectionHeader->commonEncodingsArraySectionOffset()];
686 for (uint32_t i=0; i < sectionHeader->commonEncodingsArrayCount(); ++i) {
687 printf("\t\tencoding[%3u]=0x%08X\n", i, A::P::E::get32(commonEncodings[i]));
688 }
689 printf("\tpersonalities: (count=%u)\n", sectionHeader->personalityArrayCount());
690 const uint32_t* personalityArray = (uint32_t*)&sectionContent[sectionHeader->personalityArraySectionOffset()];
691 for (uint32_t i=0; i < sectionHeader->personalityArrayCount(); ++i) {
692 printf("\t\t[%2u]=0x%08X\n", i+1, A::P::E::get32(personalityArray[i]));
693 }
694 printf("\tfirst level index: (count=%u)\n", sectionHeader->indexCount());
695 macho_unwind_info_section_header_index_entry<P>* indexes = (macho_unwind_info_section_header_index_entry<P>*)&sectionContent[sectionHeader->indexSectionOffset()];
696 for (uint32_t i=0; i < sectionHeader->indexCount(); ++i) {
697 printf("\t\t[%2u] funcOffset=0x%08X, pageOffset=0x%08X, lsdaOffset=0x%08X\n",
698 i, indexes[i].functionOffset(), indexes[i].secondLevelPagesSectionOffset(), indexes[i].lsdaIndexArraySectionOffset());
699 }
700 uint32_t lsdaIndexArraySectionOffset = indexes[0].lsdaIndexArraySectionOffset();
701 uint32_t lsdaIndexArrayEndSectionOffset = indexes[sectionHeader->indexCount()-1].lsdaIndexArraySectionOffset();
702 uint32_t lsdaIndexArrayCount = (lsdaIndexArrayEndSectionOffset-lsdaIndexArraySectionOffset)/sizeof(macho_unwind_info_section_header_lsda_index_entry<P>);
703 printf("\tLSDA table: (section offset 0x%08X, count=%u)\n", lsdaIndexArraySectionOffset, lsdaIndexArrayCount);
704 macho_unwind_info_section_header_lsda_index_entry<P>* lindex = (macho_unwind_info_section_header_lsda_index_entry<P>*)&sectionContent[lsdaIndexArraySectionOffset];
705 for (uint32_t i=0; i < lsdaIndexArrayCount; ++i) {
706 const char* name = showFunctionNames ? functionName(lindex[i].functionOffset()+fMachHeaderAddress) : "";
707 printf("\t\t[%3u] funcOffset=0x%08X, lsdaOffset=0x%08X, %s\n", i, lindex[i].functionOffset(), lindex[i].lsdaOffset(), name);
708 if ( *(((uint8_t*)fHeader) + lindex[i].lsdaOffset()) != 0xFF )
709 fprintf(stderr, "BAD LSDA entry (does not start with 0xFF) for %s\n", functionName(lindex[i].functionOffset()+fMachHeaderAddress));
710 }
711 for (uint32_t i=0; i < sectionHeader->indexCount()-1; ++i) {
712 printf("\tsecond level index[%u] sectionOffset=0x%08X, count=%u, fileOffset=0x%08X\n", i, indexes[i].secondLevelPagesSectionOffset(),
713 sectionHeader->indexCount(), fUnwindSection->offset()+indexes[i].secondLevelPagesSectionOffset());
714 macho_unwind_info_regular_second_level_page_header<P>* page = (macho_unwind_info_regular_second_level_page_header<P>*)&sectionContent[indexes[i].secondLevelPagesSectionOffset()];
715 if ( page->kind() == UNWIND_SECOND_LEVEL_REGULAR ) {
716 printf("\t\tkind=UNWIND_SECOND_LEVEL_REGULAR\n");
717 printf("\t\tentryPageOffset=0x%08X\n", page->entryPageOffset());
718 printf("\t\tentryCount=0x%08X\n", page->entryCount());
719 const macho_unwind_info_regular_second_level_entry<P>* entry = (macho_unwind_info_regular_second_level_entry<P>*)((char*)page+page->entryPageOffset());
720 for (uint32_t j=0; j < page->entryCount(); ++j) {
721 uint32_t funcOffset = entry[j].functionOffset();
722 if ( entry[j].encoding() & UNWIND_HAS_LSDA ) {
723 // verify there is a corresponding entry in lsda table
724 bool found = false;
725 for (uint32_t k=0; k < lsdaIndexArrayCount; ++k) {
726 if ( lindex[k].functionOffset() == funcOffset ) {
727 found = true;
728 break;
729 }
730 }
731 if ( !found ) {
732 fprintf(stderr, "MISSING LSDA entry for %s\n", functionName(funcOffset+fMachHeaderAddress));
733 }
734 }
735 char encodingString[100];
736 decode(entry[j].encoding(), ((const uint8_t*)fHeader)+funcOffset, encodingString);
737 const char* name = showFunctionNames ? functionName(funcOffset+fMachHeaderAddress) : "";
738 printf("\t\t\t[%3u] funcOffset=0x%08X, encoding=0x%08X (%-40s) %s\n",
739 j, funcOffset, entry[j].encoding(), encodingString, name);
740 }
741 }
742 else if ( page->kind() == UNWIND_SECOND_LEVEL_COMPRESSED ) {
743 macho_unwind_info_compressed_second_level_page_header<P>* cp = (macho_unwind_info_compressed_second_level_page_header<P>*)page;
744 printf("\t\tkind=UNWIND_SECOND_LEVEL_COMPRESSED\n");
745 printf("\t\tentryPageOffset=0x%08X\n", cp->entryPageOffset());
746 printf("\t\tentryCount=0x%08X\n", cp->entryCount());
747 printf("\t\tencodingsPageOffset=0x%08X\n", cp->encodingsPageOffset());
748 printf("\t\tencodingsCount=0x%08X\n", cp->encodingsCount());
749 const uint32_t* entries = (uint32_t*)(((uint8_t*)page)+cp->entryPageOffset());
750 const uint32_t* encodings = (uint32_t*)(((uint8_t*)page)+cp->encodingsPageOffset());
751 const uint32_t baseFunctionOffset = indexes[i].functionOffset();
752 for (uint32_t j=0; j < cp->entryCount(); ++j) {
753 uint8_t encodingIndex = UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(entries[j]);
754 uint32_t encoding;
755 if ( encodingIndex < sectionHeader->commonEncodingsArrayCount() )
756 encoding = A::P::E::get32(commonEncodings[encodingIndex]);
757 else
758 encoding = A::P::E::get32(encodings[encodingIndex-sectionHeader->commonEncodingsArrayCount()]);
759 char encodingString[100];
760 uint32_t funcOff = UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(entries[j])+baseFunctionOffset;
761 decode(encoding, ((const uint8_t*)fHeader)+funcOff, encodingString);
762 const char* name = showFunctionNames ? functionName(funcOff+fMachHeaderAddress) : "";
763 if ( encoding & UNWIND_HAS_LSDA ) {
764 // verify there is a corresponding entry in lsda table
765 bool found = false;
766 for (uint32_t k=0; k < lsdaIndexArrayCount; ++k) {
767 if ( lindex[k].functionOffset() == funcOff ) {
768 found = true;
769 break;
770 }
771 }
772 if ( !found ) {
773 fprintf(stderr, "MISSING LSDA entry for %s\n", name);
774 }
775 }
776 printf("\t\t\t[%3u] funcOffset=0x%08X, encoding[%3u]=0x%08X (%-40s) %s\n",
777 j, funcOff, encodingIndex, encoding, encodingString, name);
778 }
779 }
780 else {
781 fprintf(stderr, "\t\tbad page header\n");
782 }
783 }
784
785}
786
787static void dump(const char* path, const std::set<cpu_type_t>& onlyArchs, bool showFunctionNames)
788{
789 struct stat stat_buf;
790
791 try {
792 int fd = ::open(path, O_RDONLY, 0);
793 if ( fd == -1 )
794 throw "cannot open file";
795 if ( ::fstat(fd, &stat_buf) != 0 )
796 throwf("fstat(%s) failed, errno=%d\n", path, errno);
797 uint32_t length = stat_buf.st_size;
798 uint8_t* p = (uint8_t*)::mmap(NULL, stat_buf.st_size, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
799 if ( p == ((uint8_t*)(-1)) )
800 throw "cannot map file";
801 ::close(fd);
802 const mach_header* mh = (mach_header*)p;
803 if ( mh->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
804 const struct fat_header* fh = (struct fat_header*)p;
805 const struct fat_arch* archs = (struct fat_arch*)(p + sizeof(struct fat_header));
806 for (unsigned long i=0; i < OSSwapBigToHostInt32(fh->nfat_arch); ++i) {
807 size_t offset = OSSwapBigToHostInt32(archs[i].offset);
808 size_t size = OSSwapBigToHostInt32(archs[i].size);
809 unsigned int cputype = OSSwapBigToHostInt32(archs[i].cputype);
810 if ( onlyArchs.count(cputype) ) {
811 switch(cputype) {
812 case CPU_TYPE_POWERPC:
813 if ( UnwindPrinter<ppc>::validFile(p + offset) )
814 UnwindPrinter<ppc>::make(p + offset, size, path, showFunctionNames);
815 else
816 throw "in universal file, ppc slice does not contain ppc mach-o";
817 break;
818 case CPU_TYPE_I386:
819 if ( UnwindPrinter<x86>::validFile(p + offset) )
820 UnwindPrinter<x86>::make(p + offset, size, path, showFunctionNames);
821 else
822 throw "in universal file, i386 slice does not contain i386 mach-o";
823 break;
824 case CPU_TYPE_POWERPC64:
825 if ( UnwindPrinter<ppc64>::validFile(p + offset) )
826 UnwindPrinter<ppc64>::make(p + offset, size, path, showFunctionNames);
827 else
828 throw "in universal file, ppc64 slice does not contain ppc64 mach-o";
829 break;
830 case CPU_TYPE_X86_64:
831 if ( UnwindPrinter<x86_64>::validFile(p + offset) )
832 UnwindPrinter<x86_64>::make(p + offset, size, path, showFunctionNames);
833 else
834 throw "in universal file, x86_64 slice does not contain x86_64 mach-o";
835 break;
836 case CPU_TYPE_ARM:
837 if ( UnwindPrinter<arm>::validFile(p + offset) )
838 UnwindPrinter<arm>::make(p + offset, size, path, showFunctionNames);
839 else
840 throw "in universal file, arm slice does not contain arm mach-o";
841 break;
842 default:
843 throwf("in universal file, unknown architecture slice 0x%x\n", cputype);
844 }
845 }
846 }
847 }
848 else if ( UnwindPrinter<x86>::validFile(p) && onlyArchs.count(CPU_TYPE_I386) ) {
849 UnwindPrinter<x86>::make(p, length, path, showFunctionNames);
850 }
851 else if ( UnwindPrinter<ppc>::validFile(p) && onlyArchs.count(CPU_TYPE_POWERPC) ) {
852 UnwindPrinter<ppc>::make(p, length, path, showFunctionNames);
853 }
854 else if ( UnwindPrinter<ppc64>::validFile(p) && onlyArchs.count(CPU_TYPE_POWERPC64) ) {
855 UnwindPrinter<ppc64>::make(p, length, path, showFunctionNames);
856 }
857 else if ( UnwindPrinter<x86_64>::validFile(p) && onlyArchs.count(CPU_TYPE_X86_64) ) {
858 UnwindPrinter<x86_64>::make(p, length, path, showFunctionNames);
859 }
860 else if ( UnwindPrinter<arm>::validFile(p) && onlyArchs.count(CPU_TYPE_ARM) ) {
861 UnwindPrinter<arm>::make(p, length, path, showFunctionNames);
862 }
863 else {
864 throw "not a known file type";
865 }
866 }
867 catch (const char* msg) {
868 throwf("%s in %s", msg, path);
869 }
870}
871
872
873int main(int argc, const char* argv[])
874{
875 std::set<cpu_type_t> onlyArchs;
876 std::vector<const char*> files;
877 bool showFunctionNames = true;
878
879 try {
880 for(int i=1; i < argc; ++i) {
881 const char* arg = argv[i];
882 if ( arg[0] == '-' ) {
883 if ( strcmp(arg, "-arch") == 0 ) {
884 const char* arch = argv[++i];
885 if ( strcmp(arch, "ppc") == 0 )
886 onlyArchs.insert(CPU_TYPE_POWERPC);
887 else if ( strcmp(arch, "ppc64") == 0 )
888 onlyArchs.insert(CPU_TYPE_POWERPC64);
889 else if ( strcmp(arch, "i386") == 0 )
890 onlyArchs.insert(CPU_TYPE_I386);
891 else if ( strcmp(arch, "x86_64") == 0 )
892 onlyArchs.insert(CPU_TYPE_X86_64);
893 else if ( strcmp(arch, "arm") == 0 )
894 onlyArchs.insert(CPU_TYPE_ARM);
895 else
896 throwf("unknown architecture %s", arch);
897 }
898 else if ( strcmp(arg, "-no_symbols") == 0 ) {
899 showFunctionNames = false;
900 }
901 else {
902 throwf("unknown option: %s\n", arg);
903 }
904 }
905 else {
906 files.push_back(arg);
907 }
908 }
909
910 // use all architectures if no restrictions specified
911 if ( onlyArchs.size() == 0 ) {
912 onlyArchs.insert(CPU_TYPE_POWERPC);
913 onlyArchs.insert(CPU_TYPE_POWERPC64);
914 onlyArchs.insert(CPU_TYPE_I386);
915 onlyArchs.insert(CPU_TYPE_X86_64);
916 onlyArchs.insert(CPU_TYPE_ARM);
917 }
918
919 // process each file
920 for(std::vector<const char*>::iterator it=files.begin(); it != files.end(); ++it) {
921 dump(*it, onlyArchs, showFunctionNames);
922 }
923
924 }
925 catch (const char* msg) {
926 fprintf(stderr, "UnwindDump failed: %s\n", msg);
927 return 1;
928 }
929
930 return 0;
931}
932
933
934
mirror of ld64