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ppc stackwalker (#30). r=bryner

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- Implementation of PowerPC stackwalker.  Tested using stackwalker_selftest
   (#18).
 - Hook up processor-side multi-CPU support in MinidumpProcessor and
   minidump_stackwalk using the new Stackwalker::StackwalkerForCPU method.

http://groups.google.com/group/airbag-dev/browse_thread/thread/1c2fa7c5182a77a9


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@34 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
mmentovai 2006-09-25 18:29:48 +00:00
parent 3402cae5e5
commit 960e5277ee
11 changed files with 335 additions and 73 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
Makefile.am
View file

@ -70,6 +70,8 @@ src_libairbag_la_SOURCES = \
src/processor/source_line_resolver.h \
src/processor/stackwalker.cc \
src/processor/stackwalker.h \
src/processor/stackwalker_ppc.cc \
src/processor/stackwalker_ppc.h \
src/processor/stackwalker_x86.cc \
src/processor/stackwalker_x86.h
@ -102,6 +104,7 @@ src_processor_minidump_processor_unittest_LDADD = \
src/processor/minidump_processor.lo \
src/processor/minidump.lo \
src/processor/stackwalker.lo \
src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo \
src/processor/source_line_resolver.lo
@ -130,6 +133,7 @@ src_processor_minidump_stackwalk_SOURCES = \
src_processor_minidump_stackwalk_LDADD = \
src/processor/minidump.lo \
src/processor/stackwalker.lo \
src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo \
src/processor/source_line_resolver.lo

16
Makefile.in
View file

@ -107,7 +107,8 @@ am__dirstamp = $(am__leading_dot)dirstamp
am_src_libairbag_la_OBJECTS = src/processor/minidump.lo \
src/processor/minidump_processor.lo \
src/processor/source_line_resolver.lo \
src/processor/stackwalker.lo src/processor/stackwalker_x86.lo
src/processor/stackwalker.lo src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo
src_libairbag_la_OBJECTS = $(am_src_libairbag_la_OBJECTS)
binPROGRAMS_INSTALL = $(INSTALL_PROGRAM)
PROGRAMS = $(bin_PROGRAMS) $(noinst_PROGRAMS)
@ -127,7 +128,8 @@ src_processor_minidump_processor_unittest_OBJECTS = \
$(am_src_processor_minidump_processor_unittest_OBJECTS)
src_processor_minidump_processor_unittest_DEPENDENCIES = \
src/processor/minidump_processor.lo src/processor/minidump.lo \
src/processor/stackwalker.lo src/processor/stackwalker_x86.lo \
src/processor/stackwalker.lo src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo \
src/processor/source_line_resolver.lo
am_src_processor_minidump_stackwalk_OBJECTS = \
src/processor/minidump_stackwalk.$(OBJEXT)
@ -135,6 +137,7 @@ src_processor_minidump_stackwalk_OBJECTS = \
$(am_src_processor_minidump_stackwalk_OBJECTS)
src_processor_minidump_stackwalk_DEPENDENCIES = \
src/processor/minidump.lo src/processor/stackwalker.lo \
src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo \
src/processor/source_line_resolver.lo
am_src_processor_postfix_evaluator_unittest_OBJECTS = \
@ -339,6 +342,8 @@ src_libairbag_la_SOURCES = \
src/processor/source_line_resolver.h \
src/processor/stackwalker.cc \
src/processor/stackwalker.h \
src/processor/stackwalker_ppc.cc \
src/processor/stackwalker_ppc.h \
src/processor/stackwalker_x86.cc \
src/processor/stackwalker_x86.h
@ -358,6 +363,7 @@ src_processor_minidump_processor_unittest_LDADD = \
src/processor/minidump_processor.lo \
src/processor/minidump.lo \
src/processor/stackwalker.lo \
src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo \
src/processor/source_line_resolver.lo
@ -386,6 +392,7 @@ src_processor_minidump_stackwalk_SOURCES = \
src_processor_minidump_stackwalk_LDADD = \
src/processor/minidump.lo \
src/processor/stackwalker.lo \
src/processor/stackwalker_ppc.lo \
src/processor/stackwalker_x86.lo \
src/processor/source_line_resolver.lo
@ -495,6 +502,8 @@ src/processor/source_line_resolver.lo: src/processor/$(am__dirstamp) \
src/processor/$(DEPDIR)/$(am__dirstamp)
src/processor/stackwalker.lo: src/processor/$(am__dirstamp) \
src/processor/$(DEPDIR)/$(am__dirstamp)
src/processor/stackwalker_ppc.lo: src/processor/$(am__dirstamp) \
src/processor/$(DEPDIR)/$(am__dirstamp)
src/processor/stackwalker_x86.lo: src/processor/$(am__dirstamp) \
src/processor/$(DEPDIR)/$(am__dirstamp)
src/$(am__dirstamp):
@ -603,6 +612,8 @@ mostlyclean-compile:
-rm -f src/processor/source_line_resolver_unittest.$(OBJEXT)
-rm -f src/processor/stackwalker.$(OBJEXT)
-rm -f src/processor/stackwalker.lo
-rm -f src/processor/stackwalker_ppc.$(OBJEXT)
-rm -f src/processor/stackwalker_ppc.lo
-rm -f src/processor/stackwalker_x86.$(OBJEXT)
-rm -f src/processor/stackwalker_x86.lo
@ -620,6 +631,7 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@src/processor/$(DEPDIR)/source_line_resolver.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/processor/$(DEPDIR)/source_line_resolver_unittest.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/processor/$(DEPDIR)/stackwalker.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/processor/$(DEPDIR)/stackwalker_ppc.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@src/processor/$(DEPDIR)/stackwalker_x86.Plo@am__quote@
.cc.o:

2
src/processor/minidump.cc
View file

@ -588,7 +588,7 @@ void MinidumpContext::Print() {
for (unsigned int fpr_index = 0;
fpr_index < MD_FLOATINGSAVEAREA_PPC_FPR_COUNT;
++fpr_index) {
printf(" float_save.fpregs[%2d] = 0x%x\n",
printf(" float_save.fpregs[%2d] = 0x%llx\n",
fpr_index, context_ppc->float_save.fpregs[fpr_index]);
}
printf(" float_save.fpscr = 0x%x\n",

16
src/processor/minidump_processor.cc
View file

@ -27,10 +27,14 @@
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <memory>
#include "google/minidump_processor.h"
#include "processor/minidump.h"
#include "processor/stackwalker_x86.h"
using std::auto_ptr;
namespace google_airbag {
MinidumpProcessor::MinidumpProcessor(SymbolSupplier *supplier)
@ -68,10 +72,14 @@ bool MinidumpProcessor::Process(const string &minidump_file,
return false;
}
// TODO(bryner): figure out which StackWalker we want
StackwalkerX86 walker(exception->GetContext(), thread_memory,
dump.GetModuleList(), supplier_);
walker.Walk(stack_frames);
auto_ptr<Stackwalker> walker(
Stackwalker::StackwalkerForCPU(exception->GetContext(), thread_memory,
dump.GetModuleList(), supplier_));
if (!walker.get()) {
return false;
}
walker->Walk(stack_frames);
return true;
}

37
src/processor/minidump_stackwalk.cc
View file

@ -35,17 +35,28 @@
#include <stdlib.h>
#include <stdio.h>
#include <memory>
#include <string>
#include "processor/minidump.h"
#include "processor/stackwalker_x86.h"
using std::auto_ptr;
using std::string;
using namespace google_airbag;
using google_airbag::MemoryRegion;
using google_airbag::Minidump;
using google_airbag::MinidumpContext;
using google_airbag::MinidumpException;
using google_airbag::MinidumpModuleList;
using google_airbag::MinidumpThread;
using google_airbag::MinidumpThreadList;
using google_airbag::StackFrame;
using google_airbag::StackFrames;
using google_airbag::Stackwalker;
int main(int argc, char** argv) {
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "usage: %s <file>\n", argv[0]);
exit(1);
@ -57,48 +68,52 @@ int main(int argc, char** argv) {
exit(1);
}
MinidumpException* exception = minidump.GetException();
MinidumpException *exception = minidump.GetException();
if (!exception) {
fprintf(stderr, "minidump.GetException() failed\n");
exit(1);
}
MinidumpThreadList* thread_list = minidump.GetThreadList();
MinidumpThreadList *thread_list = minidump.GetThreadList();
if (!thread_list) {
fprintf(stderr, "minidump.GetThreadList() failed\n");
exit(1);
}
MinidumpThread* exception_thread =
MinidumpThread *exception_thread =
thread_list->GetThreadByID(exception->GetThreadID());
if (!exception_thread) {
fprintf(stderr, "thread_list->GetThreadByID() failed\n");
exit(1);
}
MemoryRegion* stack_memory = exception_thread->GetMemory();
MemoryRegion *stack_memory = exception_thread->GetMemory();
if (!stack_memory) {
fprintf(stderr, "exception_thread->GetStackMemory() failed\n");
exit(1);
}
MinidumpContext* context = exception->GetContext();
MinidumpContext *context = exception->GetContext();
if (!context) {
fprintf(stderr, "exception->GetContext() failed\n");
exit(1);
}
MinidumpModuleList* modules = minidump.GetModuleList();
MinidumpModuleList *modules = minidump.GetModuleList();
if (!modules) {
fprintf(stderr, "minidump.GetModuleList() failed\n");
exit(1);
}
StackwalkerX86 stackwalker = StackwalkerX86(context, stack_memory,
modules, NULL);
auto_ptr<Stackwalker> stackwalker(
Stackwalker::StackwalkerForCPU(context, stack_memory, modules, NULL));
if (!stackwalker.get()) {
fprintf(stderr, "Stackwalker::StackwalkerForCPU failed\n");
exit(1);
}
StackFrames stack;
stackwalker.Walk(&stack);
stackwalker->Walk(&stack);
unsigned int index;
for (index = 0 ; index < stack.size() ; index++) {

42
src/processor/stackwalker.cc
View file

@ -37,22 +37,20 @@
#include <memory>
#include "processor/stackwalker.h"
#include "google/symbol_supplier.h"
#include "processor/minidump.h"
#include "processor/source_line_resolver.h"
#include "google/symbol_supplier.h"
#include "processor/stackwalker_ppc.h"
#include "processor/stackwalker_x86.h"
namespace google_airbag {
using std::auto_ptr;
Stackwalker::Stackwalker(MemoryRegion* memory, MinidumpModuleList* modules,
SymbolSupplier* supplier)
: memory_(memory),
modules_(modules),
supplier_(supplier) {
Stackwalker::Stackwalker(MemoryRegion *memory, MinidumpModuleList *modules,
SymbolSupplier *supplier)
: memory_(memory), modules_(modules), supplier_(supplier) {
}
@ -72,7 +70,7 @@ void Stackwalker::Walk(StackFrames *frames) {
// Resolve the module information, if a module map was provided.
if (modules_) {
MinidumpModule* module =
MinidumpModule *module =
modules_->GetModuleForAddress(frame->instruction);
if (module) {
frame->module_name = *(module->GetName());
@ -97,9 +95,33 @@ void Stackwalker::Walk(StackFrames *frames) {
frame.reset(new StackFrame());
// Get the next frame.
valid = GetCallerFrame(frame.get());
valid = GetCallerFrame(frame.get(), frames);
}
}
// static
Stackwalker* Stackwalker::StackwalkerForCPU(MinidumpContext *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier) {
Stackwalker *cpu_stackwalker = NULL;
u_int32_t cpu = context->GetContextCPU();
switch (cpu) {
case MD_CONTEXT_X86:
cpu_stackwalker = new StackwalkerX86(context->GetContextX86(),
memory, modules, supplier);
break;
case MD_CONTEXT_PPC:
cpu_stackwalker = new StackwalkerPPC(context->GetContextPPC(),
memory, modules, supplier);
break;
}
return cpu_stackwalker;
}
} // namespace google_airbag

35
src/processor/stackwalker.h
View file

@ -46,10 +46,9 @@
#include "google/stack_frame.h"
#include "processor/memory_region.h"
namespace google_airbag {
class MinidumpContext;
class MinidumpModuleList;
class SymbolSupplier;
@ -63,6 +62,14 @@ class Stackwalker {
// data.
void Walk(StackFrames *frames);
// Returns a new concrete subclass suitable for the CPU that a stack was
// generated on, according to the CPU type indicated by the context
// argument. If no suitable concrete subclass exists, returns NULL.
static Stackwalker* StackwalkerForCPU(MinidumpContext *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier);
protected:
// memory identifies a MemoryRegion that provides the stack memory
// for the stack to walk. modules, if non-NULL, is a MinidumpModuleList
@ -70,32 +77,34 @@ class Stackwalker {
// associated with. supplier is an optional caller-supplied SymbolSupplier
// implementation. If supplier is NULL, source line info will not be
// resolved.
Stackwalker(MemoryRegion* memory,
MinidumpModuleList* modules,
SymbolSupplier* supplier);
Stackwalker(MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier);
// The stack memory to walk. Subclasses will require this region to
// get information from the stack.
MemoryRegion* memory_;
MemoryRegion *memory_;
private:
// Obtains the context frame, the innermost called procedure in a stack
// trace. Returns false on failure.
virtual bool GetContextFrame(StackFrame* frame) = 0;
virtual bool GetContextFrame(StackFrame *frame) = 0;
// Obtains a caller frame. Each call to GetCallerFrame should return the
// frame that called the last frame returned by GetContextFrame or
// GetCallerFrame. GetCallerFrame should return false on failure or
// when there are no more caller frames (when the end of the stack has
// been reached).
virtual bool GetCallerFrame(StackFrame* frame) = 0;
// GetCallerFrame. To aid this purpose, walked_frames contains the
// StackFrames vector of frames that have already been walked.
// GetCallerFrame should return false on failure or when there are no more
// caller frames (when the end of the stack has been reached).
virtual bool GetCallerFrame(StackFrame *frame,
const StackFrames *walked_frames) = 0;
// A list of modules, for populating each StackFrame's module information.
// This field is optional and may be NULL.
MinidumpModuleList* modules_;
MinidumpModuleList *modules_;
// The optional SymbolSupplier for resolving source line info.
SymbolSupplier* supplier_;
SymbolSupplier *supplier_;
};

120
src/processor/stackwalker_ppc.cc Normal file
View file

@ -0,0 +1,120 @@
// Copyright (c) 2006, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// stackwalker_ppc.cc: ppc-specific stackwalker.
//
// See stackwalker_ppc.h for documentation.
//
// Author: Mark Mentovai
#include "processor/stackwalker_ppc.h"
#include "processor/minidump.h"
namespace google_airbag {
StackwalkerPPC::StackwalkerPPC(const MDRawContextPPC *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier)
: Stackwalker(memory, modules, supplier),
context_(context) {
if (memory_->GetBase() + memory_->GetSize() - 1 > 0xffffffff) {
// This implementation only covers 32-bit ppc CPUs. The limits of the
// supplied stack are invalid. Mark memory_ = NULL, which will cause
// stackwalking to fail.
memory_ = NULL;
}
}
bool StackwalkerPPC::GetContextFrame(StackFrame *frame) {
if (!context_ || !memory_ || !frame)
return false;
// The stack frame and instruction pointers are stored directly in
// registers, so pull them straight out of the CPU context structure.
frame->frame_pointer = context_->gpr[1];
frame->instruction = context_->srr0;
return true;
}
bool StackwalkerPPC::GetCallerFrame(StackFrame *frame,
const StackFrames *walked_frames) {
if (!memory_ || !frame || !walked_frames)
return false;
// The stack frame and instruction pointers for previous frames are saved
// on the stack. The typical ppc calling convention is for the called
// procedure to store its return address in the calling procedure's stack
// frame at 8(%r1), and to allocate its own stack frame by decrementing %r1
// (the stack pointer) and saving the old value of %r1 at 0(%r1). Because
// the ppc has no hardware stack, there is no distinction between the
// stack pointer and frame pointer, and what is typically thought of as
// the frame pointer on an x86 is usually referred to as the stack pointer
// on a ppc.
u_int32_t last_stack_pointer = walked_frames->back().frame_pointer;
// Don't pass frame.frame_pointer or frame.instruction directly
// ReadMemory, because their types are too wide (64-bit), and we
// specifically want to read 32-bit quantities for both.
u_int32_t stack_pointer;
if (!memory_->GetMemoryAtAddress(last_stack_pointer, &stack_pointer))
return false;
// A caller frame must reside higher in memory than its callee frames.
// Anything else is an error, or an indication that we've reached the
// end of the stack.
if (stack_pointer <= last_stack_pointer)
return false;
u_int32_t instruction;
if (!memory_->GetMemoryAtAddress(stack_pointer + 8, &instruction))
return false;
// Mac OS X/Darwin gives 1 as the return address from the bottom-most
// frame in a stack (a thread's entry point). I haven't found any
// documentation on this, but 0 or 1 would be bogus return addresses,
// so check for them here and return false (end of stack) when they're
// hit to avoid having a phantom frame.
if (instruction <= 1)
return false;
frame->frame_pointer = stack_pointer;
frame->instruction = instruction;
return true;
}
} // namespace google_airbag

80
src/processor/stackwalker_ppc.h Normal file
View file

@ -0,0 +1,80 @@
// Copyright (c) 2006, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// stackwalker_ppc.h: ppc-specific stackwalker.
//
// Provides stack frames given ppc register context and a memory region
// corresponding to a ppc stack.
//
// Author: Mark Mentovai
#ifndef PROCESSOR_STACKWALKER_PPC_H__
#define PROCESSOR_STACKWALKER_PPC_H__
#include "google/airbag_types.h"
#include "processor/stackwalker.h"
#include "processor/minidump_format.h"
namespace google_airbag {
class MinidumpContext;
class MinidumpModuleList;
class StackwalkerPPC : public Stackwalker {
public:
// context is a MinidumpContext object that gives access to ppc-specific
// register state corresponding to the innermost called frame to be
// included in the stack. The other arguments are passed directly through
// to the base Stackwalker constructor.
StackwalkerPPC(const MDRawContextPPC *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier);
private:
// Implementation of Stackwalker, using ppc context (stack pointer in %r1,
// saved program counter in %srr0) and stack conventions (saved stack
// pointer at 0(%r1), return address at 8(0(%r1)).
virtual bool GetContextFrame(StackFrame *frame);
virtual bool GetCallerFrame(StackFrame *frame,
const StackFrames *walked_frames);
// Stores the CPU context corresponding to the innermost stack frame to
// be returned by GetContextFrame.
const MDRawContextPPC *context_;
};
} // namespace google_airbag
#endif // PROCESSOR_STACKWALKER_PPC_H__

35
src/processor/stackwalker_x86.cc
View file

@ -37,44 +37,39 @@
#include "processor/stackwalker_x86.h"
#include "processor/minidump.h"
namespace google_airbag {
StackwalkerX86::StackwalkerX86(MinidumpContext* context,
MemoryRegion* memory,
MinidumpModuleList* modules,
SymbolSupplier* supplier)
StackwalkerX86::StackwalkerX86(const MDRawContextX86 *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier)
: Stackwalker(memory, modules, supplier),
last_frame_pointer_(0) {
context_(context) {
if (memory_->GetBase() + memory_->GetSize() - 1 > 0xffffffff) {
// The x86 is a 32-bit CPU, the limits of the supplied stack are invalid.
// Mark memory_ = NULL, which will cause stackwalking to fail.
memory_ = NULL;
}
// If |context| is not an x86 context, context_ will be set to NULL,
// which will cause GetContextFrame to fail when called by Walk.
// For StackwalkerX86, |context| should only ever be an x86 context.
context_ = context->GetContextX86();
}
bool StackwalkerX86::GetContextFrame(StackFrame* frame) {
bool StackwalkerX86::GetContextFrame(StackFrame *frame) {
if (!context_ || !memory_ || !frame)
return false;
// The frame and instruction pointers are stored directly in registers,
// so pull them straight out of the CPU context structure.
frame->frame_pointer = last_frame_pointer_ = context_->ebp;
frame->frame_pointer = context_->ebp;
frame->instruction = context_->eip;
return true;
}
bool StackwalkerX86::GetCallerFrame(StackFrame* frame) {
if (!memory_ || !frame)
bool StackwalkerX86::GetCallerFrame(StackFrame *frame,
const StackFrames *walked_frames) {
if (!memory_ || !frame || !walked_frames)
return false;
// The frame and instruction pointers for previous frames are saved on the
@ -93,24 +88,26 @@ bool StackwalkerX86::GetCallerFrame(StackFrame* frame) {
// considerably more difficult, requiring debugging information. This
// stackwalker doesn't attempt to solve that problem (at this point).
u_int32_t last_frame_pointer = walked_frames->back().frame_pointer;
// Don't pass frame.frame_pointer or frame.instruction directly
// ReadMemory, because their types are too wide (64-bit), and we
// specifically want to read 32-bit quantities for both.
u_int32_t frame_pointer;
if (!memory_->GetMemoryAtAddress(last_frame_pointer_, &frame_pointer))
if (!memory_->GetMemoryAtAddress(last_frame_pointer, &frame_pointer))
return false;
// A caller frame must reside higher in memory than its callee frames.
// Anything else is an error, or an indication that we've reached the
// end of the stack.
if (frame_pointer <= last_frame_pointer_)
if (frame_pointer <= last_frame_pointer)
return false;
u_int32_t instruction;
if (!memory_->GetMemoryAtAddress(last_frame_pointer_ + 4, &instruction))
if (!memory_->GetMemoryAtAddress(last_frame_pointer + 4, &instruction))
return false;
frame->frame_pointer = last_frame_pointer_ = frame_pointer;
frame->frame_pointer = frame_pointer;
frame->instruction = instruction;
return true;

21
src/processor/stackwalker_x86.h
View file

@ -43,10 +43,8 @@
#include "processor/stackwalker.h"
#include "processor/minidump_format.h"
namespace google_airbag {
class MinidumpContext;
class MinidumpModuleList;
@ -57,24 +55,21 @@ class StackwalkerX86 : public Stackwalker {
// register state corresponding to the innermost called frame to be
// included in the stack. The other arguments are passed directly through
// to the base Stackwalker constructor.
StackwalkerX86(MinidumpContext* context,
MemoryRegion* memory,
MinidumpModuleList* modules,
SymbolSupplier* supplier);
StackwalkerX86(const MDRawContextX86 *context,
MemoryRegion *memory,
MinidumpModuleList *modules,
SymbolSupplier *supplier);
private:
// Implementation of Stackwalker, using x86 context (%ebp, %eip) and
// stack conventions (saved %ebp at [%ebp], saved %eip at 4[%ebp]).
virtual bool GetContextFrame(StackFrame* frame);
virtual bool GetCallerFrame(StackFrame* frame);
virtual bool GetContextFrame(StackFrame *frame);
virtual bool GetCallerFrame(StackFrame *frame,
const StackFrames *walked_frames);
// Stores the CPU context corresponding to the innermost stack frame to
// be returned by GetContextFrame.
const MDRawContextX86* context_;
// Stores the frame pointer returned in the last stack frame returned by
// GetContextFrame or GetCallerFrame.
u_int32_t last_frame_pointer_;
const MDRawContextX86 *context_;
};