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#include "client/minidump_file_writer-inl.h"
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#include "common/solaris/file_id.h"
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namespace google_breakpad {
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MinidumpGenerator::MinidumpGenerator()
56
MinidumpGenerator::~MinidumpGenerator() {
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bool MinidumpGenerator::WriteLwpStack(uintptr_t last_esp,
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MDMemoryDescriptor *loc) {
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uintptr_t stack_bottom = lwp_lister_->GetLwpStackBottom(last_esp);
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using namespace google_breakpad;
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// Argument for the writer function.
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struct WriterArgument {
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MinidumpFileWriter *minidump_writer;
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// Pid of the lwp who called WriteMinidumpToFile
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// The stack bottom of the lwp which caused the dump.
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// Mainly used to find the lwp id of the crashed lwp since signal
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// handler may not be called in the lwp who caused it.
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uintptr_t crashed_stack_bottom;
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// Id of the crashing lwp.
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// Signal number when crash happened. Can be 0 if this is a requested dump.
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// The ebp of the signal handler frame on x86. Can be 0 if this is a
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uintptr_t sighandler_ebp;
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// User context when crash happens. Can be NULL if this is a requested dump.
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// This is actually an out parameter, but it will be filled in at the start
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// Used to get information about the lwps.
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SolarisLwp *lwp_lister;
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// Holding context information for the callback of finding the crashing lwp.
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struct FindCrashLwpContext {
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const SolarisLwp *lwp_lister;
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uintptr_t crashing_stack_bottom;
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FindCrashLwpContext() :
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crashing_stack_bottom(0UL),
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// Callback for list lwps.
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// It will compare the stack bottom of the provided lwp with the stack
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// bottom of the crashed lwp, it they are eqaul, this lwp is the one
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bool IsLwpCrashedCallback(lwpstatus_t *lsp, void *context) {
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FindCrashLwpContext *crashing_context =
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static_cast<FindCrashLwpContext *>(context);
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const SolarisLwp *lwp_lister = crashing_context->lwp_lister;
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const prgregset_t *gregs = &(lsp->pr_reg);
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uintptr_t last_ebp = (*gregs)[R_FP];
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uintptr_t last_ebp = (*gregs)[EBP];
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uintptr_t stack_bottom = lwp_lister->GetLwpStackBottom(last_ebp);
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if (stack_bottom > last_ebp &&
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stack_bottom == crashing_context->crashing_stack_bottom) {
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// Got it. Stop iteration.
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crashing_context->crashing_lwpid = lsp->pr_lwpid;
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// Find the crashing lwpid.
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// This is done based on stack bottom comparing.
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int FindCrashingLwp(uintptr_t crashing_stack_bottom,
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const SolarisLwp *lwp_lister) {
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FindCrashLwpContext context;
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context.lwp_lister = lwp_lister;
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context.crashing_stack_bottom = crashing_stack_bottom;
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CallbackParam<LwpCallback> callback_param(IsLwpCrashedCallback,
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lwp_lister->Lwp_iter_all(lwp_lister->getpid(), &callback_param);
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return context.crashing_lwpid;
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bool WriteLwpStack(const SolarisLwp *lwp_lister,
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UntypedMDRVA *memory,
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MDMemoryDescriptor *loc) {
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uintptr_t stack_bottom = lwp_lister->GetLwpStackBottom(last_esp);
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139
if (stack_bottom >= last_esp) {
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int size = stack_bottom - last_esp;
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153
#if TARGET_CPU_SPARC
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bool MinidumpGenerator::WriteContext(MDRawContextSPARC *context, prgregset_t regs,
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prfpregset_t *fp_regs) {
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bool WriteContext(MDRawContextSPARC *context, ucontext_t *sig_ctx) {
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assert(sig_ctx != NULL);
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int* regs = sig_ctx->uc_mcontext.gregs;
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context->context_flags = MD_CONTEXT_SPARC_FULL;
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context->ccr = (unsigned int)(regs[0]);
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context->pc = (unsigned int)(regs[REG_PC]);
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context->npc = (unsigned int)(regs[REG_nPC]);
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context->y = (unsigned int)(regs[REG_Y]);
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context->asi = (unsigned int)(regs[19]);
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context->fprs = (unsigned int)(regs[20]);
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for ( int i = 0 ; i < 32; ++i ) {
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for ( int i = 1 ; i < 16; ++i ) {
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context->g_r[i] = (uintptr_t)(sig_ctx->uc_mcontext.gregs[i + 3]);
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context->g_r[30] = (uintptr_t)(((struct frame *)context->g_r[14])->fr_savfp);
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bool WriteContext(MDRawContextSPARC *context, prgregset_t regs,
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prfpregset_t *fp_regs) {
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180
if (!context || !regs)
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183
context->context_flags = MD_CONTEXT_SPARC_FULL;
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context->ccr = (unsigned int)(regs[32]);
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context->pc = (unsigned int)(regs[R_PC]);
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context->npc = (unsigned int)(regs[R_nPC]);
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context->y = (unsigned int)(regs[R_Y]);
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context->asi = (unsigned int)(regs[36]);
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context->fprs = (unsigned int)(regs[37]);
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context->ccr = (uintptr_t)(regs[32]);
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context->pc = (uintptr_t)(regs[R_PC]);
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context->npc = (uintptr_t)(regs[R_nPC]);
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context->y = (uintptr_t)(regs[R_Y]);
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context->asi = (uintptr_t)(regs[36]);
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context->fprs = (uintptr_t)(regs[37]);
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for ( int i = 0 ; i < 32 ; ++i ){
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context->g_r[i] = (unsigned int)(regs[i]);
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context->g_r[i] = (uintptr_t)(regs[i]);
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197
#elif TARGET_CPU_X86
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bool MinidumpGenerator::WriteContext(MDRawContextX86 *context, prgregset_t regs,
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prfpregset_t *fp_regs) {
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bool WriteContext(MDRawContextX86 *context, prgregset_t regs,
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prfpregset_t *fp_regs) {
101
200
if (!context || !regs)
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224
#endif /* TARGET_CPU_XXX */
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bool MinidumpGenerator::WriteLwpStream(lwpstatus_t *lsp, MDRawThread *lwp) {
226
// Write information about a crashed Lwp.
227
// When a lwp crash, kernel will write something on the stack for processing
228
// signal. This makes the current stack not reliable, and our stack walker
229
// won't figure out the whole call stack for this. So we write the stack at the
230
// time of the crash into the minidump file, not the current stack.
231
bool WriteCrashedLwpStream(MinidumpFileWriter *minidump_writer,
232
const WriterArgument *writer_args,
233
const lwpstatus_t *lsp,
235
assert(writer_args->sig_ctx != NULL);
237
lwp->thread_id = lsp->pr_lwpid;
240
UntypedMDRVA memory(minidump_writer);
241
if (!WriteLwpStack(writer_args->lwp_lister,
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writer_args->sig_ctx->uc_mcontext.gregs[REG_O6],
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TypedMDRVA<MDRawContextSPARC> context(minidump_writer);
248
if (!context.Allocate())
250
lwp->thread_context = context.location();
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memset(context.get(), 0, sizeof(MDRawContextSPARC));
252
return WriteContext(context.get(), writer_args->sig_ctx);
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UntypedMDRVA memory(minidump_writer);
255
if (!WriteLwpStack(writer_args->lwp_lister,
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writer_args->sig_ctx->uc_mcontext.gregs[UESP],
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TypedMDRVA<MDRawContextX86> context(minidump_writer);
262
if (!context.Allocate())
264
lwp->thread_context = context.location();
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memset(context.get(), 0, sizeof(MDRawContextX86));
266
return WriteContext(context.get(),
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(int *)&writer_args->sig_ctx->uc_mcontext.gregs,
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&writer_args->sig_ctx->uc_mcontext.fpregs);
272
bool WriteLwpStream(MinidumpFileWriter *minidump_writer,
273
const SolarisLwp *lwp_lister,
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const lwpstatus_t *lsp, MDRawThread *lwp) {
128
275
prfpregset_t fp_regs = lsp->pr_fpreg;
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prgregset_t *gregs = &(lsp->pr_reg);
130
UntypedMDRVA memory(&writer_);
276
const prgregset_t *gregs = &(lsp->pr_reg);
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UntypedMDRVA memory(minidump_writer);
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#if TARGET_CPU_SPARC
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if (!WriteLwpStack((*gregs)[R_SP],
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if (!WriteLwpStack(lwp_lister,
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TypedMDRVA<MDRawContextSPARC> context(&writer_);
286
TypedMDRVA<MDRawContextSPARC> context(minidump_writer);
139
287
if (!context.Allocate())
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// should be the thread_id
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380
// Callback context for get writting lwp information.
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381
struct LwpInfoCallbackCtx {
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MinidumpGenerator *generator;
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MinidumpFileWriter *minidump_writer;
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const WriterArgument *writer_args;
233
384
TypedMDRVA<MDRawThreadList> *list;
237
388
bool LwpInformationCallback(lwpstatus_t *lsp, void *context) {
238
389
bool success = true;
239
// The current thread is the one to handle the crash. Ignore it.
390
LwpInfoCallbackCtx *callback_context =
391
static_cast<LwpInfoCallbackCtx *>(context);
393
// The current lwp is the one to handle the crash. Ignore it.
240
394
if (lsp->pr_lwpid != pthread_self()) {
241
395
LwpInfoCallbackCtx *callback_context =
242
396
static_cast<LwpInfoCallbackCtx *>(context);
244
398
memset(&lwp, 0, sizeof(MDRawThread));
246
success = callback_context->generator->WriteLwpStream(lsp, &lwp);
400
if (lsp->pr_lwpid != callback_context->writer_args->crashed_lwpid ||
401
callback_context->writer_args->sig_ctx == NULL) {
402
success = WriteLwpStream(callback_context->minidump_writer,
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callback_context->writer_args->lwp_lister,
406
success = WriteCrashedLwpStream(callback_context->minidump_writer,
407
callback_context->writer_args,
248
411
callback_context->list->CopyIndexAfterObject(
249
412
callback_context->lwp_index++,
257
bool MinidumpGenerator::WriteLwpListStream(MDRawDirectory *dir) {
420
bool WriteLwpListStream(MinidumpFileWriter *minidump_writer,
421
const WriterArgument *writer_args,
422
MDRawDirectory *dir) {
258
423
// Get the lwp information.
259
int lwp_count = lwp_lister_->GetLwpCount();
424
const SolarisLwp *lwp_lister = writer_args->lwp_lister;
425
int lwp_count = lwp_lister->GetLwpCount();
260
426
if (lwp_count < 0)
262
TypedMDRVA<MDRawThreadList> list(&writer_);
428
TypedMDRVA<MDRawThreadList> list(minidump_writer);
263
429
if (!list.AllocateObjectAndArray(lwp_count - 1, sizeof(MDRawThread)))
265
431
dir->stream_type = MD_THREAD_LIST_STREAM;
267
433
list.get()->number_of_threads = lwp_count - 1;
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435
LwpInfoCallbackCtx context;
270
context.generator = this;
436
context.minidump_writer = minidump_writer;
437
context.writer_args = writer_args;
271
438
context.list = &list;
272
439
context.lwp_index = 0;
273
440
CallbackParam<LwpCallback> callback_param(LwpInformationCallback,
276
lwp_lister_->Lwp_iter_all(lwp_lister_->getpid(), &callback_param);
443
lwp_lister->Lwp_iter_all(lwp_lister->getpid(), &callback_param);
277
444
return written == lwp_count;
280
bool MinidumpGenerator::WriteCVRecord(MDRawModule *module,
281
const char *module_path) {
282
TypedMDRVA<MDCVInfoPDB70> cv(&writer_);
447
bool WriteCVRecord(MinidumpFileWriter *minidump_writer,
449
const char *module_path,
451
TypedMDRVA<MDCVInfoPDB70> cv(minidump_writer);
284
453
char path[PATH_MAX];
285
454
const char *module_name = module_path ? module_path : "<Unknown>";
286
455
snprintf(path, sizeof(path), "/proc/self/object/%s", module_name);
288
size_t module_name_length = strlen(module_name);
457
size_t module_name_length = strlen(realname);
289
458
if (!cv.AllocateObjectAndArray(module_name_length + 1, sizeof(u_int8_t)))
291
if (!cv.CopyIndexAfterObject(0, const_cast<char *>(module_name),
292
module_name_length)) {
460
if (!cv.CopyIndexAfterObject(0, realname, module_name_length))
296
463
module->cv_record = cv.location();
297
464
MDCVInfoPDB70 *cv_ptr = cv.get();
338
505
MDRawModule module;
339
506
memset(&module, 0, sizeof(module));
340
507
MDLocationDescriptor loc;
341
if (!callback_context->minidump_writer->WriteString(module_info.name,
513
snprintf(path, sizeof (path), "/proc/self/path/%s", module_info.name);
514
if ((count = readlink(path, buf, PATH_MAX)) < 0)
518
if ((realname = strrchr(buf, '/')) == NULL)
522
if (!callback_context->minidump_writer->WriteString(realname, 0, &loc))
346
525
module.base_of_image = (u_int64_t)module_info.start_addr;
347
526
module.size_of_image = module_info.size;
348
527
module.module_name_rva = loc.rva;
350
if (!callback_context->generator->WriteCVRecord(&module, module_info.name))
529
if (!WriteCVRecord(callback_context->minidump_writer, &module,
530
module_info.name, realname))
353
533
callback_context->list->CopyIndexAfterObject(
368
550
dir->location = list.location();
369
551
list.get()->number_of_modules = module_count;
370
552
ModuleInfoCallbackCtx context;
371
context.generator = this;
372
context.minidump_writer = &writer_;
553
context.minidump_writer = minidump_writer;
554
context.writer_args = writer_args;
373
555
context.list = &list;
374
556
context.module_index = 0;
375
557
CallbackParam<ModuleCallback> callback(ModuleInfoCallback, &context);
376
return lwp_lister_->ListModules(&callback) == module_count;
558
return writer_args->lwp_lister->ListModules(&callback) == module_count;
379
bool MinidumpGenerator::WriteSystemInfoStream(MDRawDirectory *dir) {
380
TypedMDRVA<MDRawSystemInfo> sys_info(&writer_);
561
bool WriteSystemInfoStream(MinidumpFileWriter *minidump_writer,
562
const WriterArgument *writer_args,
563
MDRawDirectory *dir) {
564
TypedMDRVA<MDRawSystemInfo> sys_info(minidump_writer);
382
566
if (!sys_info.Allocate())
386
570
dir->location = sys_info.location();
388
572
return WriteCPUInformation(sys_info.get()) &&
389
WriteOSInformation(sys_info.get());
573
WriteOSInformation(minidump_writer, sys_info.get());
392
bool MinidumpGenerator::WriteExceptionStream(MDRawDirectory *dir) {
397
if (getcontext(&uc) != 0)
576
bool WriteExceptionStream(MinidumpFileWriter *minidump_writer,
577
const WriterArgument *writer_args,
578
MDRawDirectory *dir) {
579
// This happenes when this is not a crash, but a requested dump.
580
if (writer_args->sig_ctx == NULL)
400
TypedMDRVA<MDRawExceptionStream> exception(&writer_);
583
TypedMDRVA<MDRawExceptionStream> exception(minidump_writer);
401
584
if (!exception.Allocate())
404
587
dir->stream_type = MD_EXCEPTION_STREAM;
405
588
dir->location = exception.location();
406
exception.get()->thread_id = requester_pid_;
407
exception.get()->exception_record.exception_code = signo_;
589
exception.get()->thread_id = writer_args->crashed_lwpid;
590
exception.get()->exception_record.exception_code = writer_args->signo;
408
591
exception.get()->exception_record.exception_flags = 0;
410
gregs = &(uc.uc_mcontext.gregs);
411
fp_regs = uc.uc_mcontext.fpregs;
412
593
#if TARGET_CPU_SPARC
413
exception.get()->exception_record.exception_address = ((unsigned int *)gregs)[1];
594
if (writer_args->sig_ctx != NULL) {
595
exception.get()->exception_record.exception_address =
596
writer_args->sig_ctx->uc_mcontext.gregs[REG_PC];
414
601
// Write context of the exception.
415
TypedMDRVA<MDRawContextSPARC> context(&writer_);
602
TypedMDRVA<MDRawContextSPARC> context(minidump_writer);
416
603
if (!context.Allocate())
418
605
exception.get()->thread_context = context.location();
419
606
memset(context.get(), 0, sizeof(MDRawContextSPARC));
421
// On Solaris i386, gregset_t = prgregset_t, fpregset_t = prfpregset_t
422
// But on Solaris Sparc are diffrent, see sys/regset.h and sys/procfs_isa.h
423
context.get()->context_flags = MD_CONTEXT_SPARC_FULL;
424
context.get()->ccr = ((unsigned int *)gregs)[0];
425
context.get()->pc = ((unsigned int *)gregs)[1];
426
context.get()->npc = ((unsigned int *)gregs)[2];
427
context.get()->y = ((unsigned int *)gregs)[3];
428
context.get()->asi = ((unsigned int *)gregs)[19];
429
context.get()->fprs = ((unsigned int *)gregs)[20];
430
for (int i = 0; i < 32; ++i) {
431
context.get()->g_r[i] = 0;
433
for (int i = 1; i < 16; ++i) {
434
context.get()->g_r[i] = ((unsigned int *)gregs)[i + 3];
607
return WriteContext(context.get(), writer_args->sig_ctx);
438
608
#elif TARGET_CPU_X86
439
exception.get()->exception_record.exception_address = (*gregs)[EIP];
609
if (writer_args->sig_ctx != NULL) {
610
exception.get()->exception_record.exception_address =
611
writer_args->sig_ctx->uc_mcontext.gregs[EIP];
440
616
// Write context of the exception.
441
TypedMDRVA<MDRawContextX86> context(&writer_);
617
TypedMDRVA<MDRawContextX86> context(minidump_writer);
442
618
if (!context.Allocate())
444
620
exception.get()->thread_context = context.location();
445
621
memset(context.get(), 0, sizeof(MDRawContextX86));
446
return WriteContext(context.get(), (int *)gregs, &fp_regs);
447
#endif /* TARGET_CPU_XXX */
622
return WriteContext(context.get(),
623
(int *)&writer_args->sig_ctx->uc_mcontext.gregs,
450
bool MinidumpGenerator::WriteMiscInfoStream(MDRawDirectory *dir) {
451
TypedMDRVA<MDRawMiscInfo> info(&writer_);
628
bool WriteMiscInfoStream(MinidumpFileWriter *minidump_writer,
629
const WriterArgument *writer_args,
630
MDRawDirectory *dir) {
631
TypedMDRVA<MDRawMiscInfo> info(minidump_writer);
453
633
if (!info.Allocate())
457
637
dir->location = info.location();
458
638
info.get()->size_of_info = sizeof(MDRawMiscInfo);
459
639
info.get()->flags1 = MD_MISCINFO_FLAGS1_PROCESS_ID;
460
info.get()->process_id = requester_pid_;
640
info.get()->process_id = writer_args->requester_pid;
465
bool MinidumpGenerator::WriteBreakpadInfoStream(MDRawDirectory *dir) {
466
TypedMDRVA<MDRawBreakpadInfo> info(&writer_);
645
bool WriteBreakpadInfoStream(MinidumpFileWriter *minidump_writer,
646
const WriterArgument *writer_args,
647
MDRawDirectory *dir) {
648
TypedMDRVA<MDRawBreakpadInfo> info(minidump_writer);
468
650
if (!info.Allocate())
486
668
SolarisLwp *lwp_;
671
// Prototype of writer functions.
672
typedef bool (*WriteStreamFN)(MinidumpFileWriter *,
673
const WriterArgument *,
676
// Function table to writer a full minidump.
677
const WriteStreamFN writers[] = {
679
WriteModuleListStream,
680
WriteSystemInfoStream,
681
WriteExceptionStream,
683
WriteBreakpadInfoStream,
489
686
// Will call each writer function in the writers table.
490
void* MinidumpGenerator::Write() {
491
// Function table to writer a full minidump.
492
const WriteStreamFN writers[] = {
493
&MinidumpGenerator::WriteLwpListStream,
494
&MinidumpGenerator::WriteModuleListStream,
495
&MinidumpGenerator::WriteSystemInfoStream,
496
&MinidumpGenerator::WriteExceptionStream,
497
&MinidumpGenerator::WriteMiscInfoStream,
498
&MinidumpGenerator::WriteBreakpadInfoStream,
687
//void* MinidumpGenerator::Write(void *argument) {
688
void* Write(void *argument) {
689
WriterArgument *writer_args = static_cast<WriterArgument *>(argument);
501
if (!lwp_lister_->ControlAllLwps(true))
691
if (!writer_args->lwp_lister->ControlAllLwps(true))
504
AutoLwpResumer lwpResumer(lwp_lister_);
506
TypedMDRVA<MDRawHeader> header(&writer_);
507
TypedMDRVA<MDRawDirectory> dir(&writer_);
694
AutoLwpResumer lwpResumer(writer_args->lwp_lister);
696
if (writer_args->sighandler_ebp != 0 &&
697
writer_args->lwp_lister->FindSigContext(writer_args->sighandler_ebp,
698
&writer_args->sig_ctx)) {
699
writer_args->crashed_stack_bottom =
700
writer_args->lwp_lister->GetLwpStackBottom(
702
writer_args->sig_ctx->uc_mcontext.gregs[REG_O6]
704
writer_args->sig_ctx->uc_mcontext.gregs[UESP]
708
int crashed_lwpid = FindCrashingLwp(writer_args->crashed_stack_bottom,
709
writer_args->requester_pid,
710
writer_args->lwp_lister);
711
if (crashed_lwpid > 0)
712
writer_args->crashed_lwpid = crashed_lwpid;
715
MinidumpFileWriter *minidump_writer = writer_args->minidump_writer;
716
TypedMDRVA<MDRawHeader> header(minidump_writer);
717
TypedMDRVA<MDRawDirectory> dir(minidump_writer);
508
718
if (!header.Allocate())
521
731
int dir_index = 0;
522
732
MDRawDirectory local_dir;
523
733
for (int i = 0; i < writer_count; ++i) {
524
if ((this->*writers[i])(&local_dir))
734
if ((*writers[i])(minidump_writer, writer_args, &local_dir))
525
735
dir.CopyIndex(dir_index++, &local_dir);
743
namespace google_breakpad {
745
MinidumpGenerator::MinidumpGenerator() {
748
MinidumpGenerator::~MinidumpGenerator() {
531
751
// Write minidump into file.
532
752
// It runs in a different thread from the crashing thread.
533
753
bool MinidumpGenerator::WriteMinidumpToFile(const char *file_pathname,
755
uintptr_t sighandler_ebp,
756
ucontext_t **sig_ctx) const {
757
// The exception handler thread.
758
pthread_t handler_thread;
535
760
assert(file_pathname != NULL);
536
assert(stack_ != NULL);
538
762
if (file_pathname == NULL)
541
if (writer_.Open(file_pathname)) {
765
MinidumpFileWriter minidump_writer;
766
if (minidump_writer.Open(file_pathname)) {
767
WriterArgument argument;
768
memset(&argument, 0, sizeof(argument));
542
769
SolarisLwp lwp_lister(getpid());
543
lwp_lister_ = &lwp_lister;
544
requester_pid_ = getpid();
770
argument.lwp_lister = &lwp_lister;
771
argument.minidump_writer = &minidump_writer;
772
argument.requester_pid = getpid();
773
argument.crashed_lwpid = pthread_self();
774
argument.signo = signo;
775
argument.sighandler_ebp = sighandler_ebp;
776
argument.sig_ctx = NULL;
778
pthread_create(&handler_thread, NULL, Write, (void *)&argument);
779
pthread_join(handler_thread, NULL);