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Print the correct return address, even on architectures where StackFrame::instruction is offset.

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a=bruce.dawson, r=jimblandy


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1105 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
jimblandy 2013-01-22 22:38:41 +00:00
parent d2153d7589
commit be81ededf8
7 changed files with 72 additions and 35 deletions
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30
src/google_breakpad/processor/stack_frame.h
View File

@ -83,11 +83,31 @@ struct StackFrame {
}
};
// The program counter location as an absolute virtual address. For the
// innermost called frame in a stack, this will be an exact program counter
// or instruction pointer value. For all other frames, this will be within
// the instruction that caused execution to branch to a called function,
// but may not necessarily point to the exact beginning of that instruction.
// Return the actual return address, as saved on the stack or in a
// register. See the comments for 'instruction', below, for details.
virtual u_int64_t ReturnAddress() const { return instruction; }
// The program counter location as an absolute virtual address.
//
// - For the innermost called frame in a stack, this will be an exact
// program counter or instruction pointer value.
//
// - For all other frames, this address is within the instruction that
// caused execution to branch to this frame's callee (although it may
// not point to the exact beginning of that instruction). This ensures
// that, when we look up the source code location for this frame, we
// get the source location of the call, not of the point at which
// control will resume when the call returns, which may be on the next
// line. (If the compiler knows the callee never returns, it may even
// place the call instruction at the very end of the caller's machine
// code, such that the "return address" (which will never be used)
// immediately after the call instruction is in an entirely different
// function, perhaps even from a different source file.)
//
// On some architectures, the return address as saved on the stack or in
// a register is fine for looking up the point of the call. On others, it
// requires adjustment. ReturnAddress returns the address as saved by the
// machine.
u_int64_t instruction;
// The module in which the instruction resides.

6
src/google_breakpad/processor/stack_frame_cpu.h
View File

@ -77,6 +77,9 @@ struct StackFrameX86 : public StackFrame {
cfi_frame_info(NULL) {}
~StackFrameX86();
// Overriden to return the return address as saved on the stack.
virtual u_int64_t ReturnAddress() const;
// Register state. This is only fully valid for the topmost frame in a
// stack. In other frames, the values of nonvolatile registers may be
// present, given sufficient debugging information. Refer to
@ -147,6 +150,9 @@ struct StackFrameAMD64 : public StackFrame {
StackFrameAMD64() : context(), context_validity(CONTEXT_VALID_NONE) {}
// Overriden to return the return address as saved on the stack.
virtual u_int64_t ReturnAddress() const;
// Register state. This is only fully valid for the topmost frame in a
// stack. In other frames, which registers are present depends on what
// debugging information we had available. Refer to context_validity.

20
src/processor/minidump_stackwalk.cc
View File

@ -144,6 +144,8 @@ static void PrintStack(const CallStack *stack, const string &cpu) {
const StackFrame *frame = stack->frames()->at(frame_index);
printf("%2d ", frame_index);
u_int64_t instruction_address = frame->ReturnAddress();
if (frame->module) {
printf("%s", PathnameStripper::File(frame->module->code_file()).c_str());
if (!frame->function_name.empty()) {
@ -153,16 +155,16 @@ static void PrintStack(const CallStack *stack, const string &cpu) {
printf(" [%s : %d + 0x%" PRIx64 "]",
source_file.c_str(),
frame->source_line,
frame->instruction - frame->source_line_base);
instruction_address - frame->source_line_base);
} else {
printf(" + 0x%" PRIx64, frame->instruction - frame->function_base);
printf(" + 0x%" PRIx64, instruction_address - frame->function_base);
}
} else {
printf(" + 0x%" PRIx64,
frame->instruction - frame->module->base_address());
instruction_address - frame->module->base_address());
}
} else {
printf("0x%" PRIx64, frame->instruction);
printf("0x%" PRIx64, instruction_address);
}
printf("\n ");
@ -275,6 +277,8 @@ static void PrintStackMachineReadable(int thread_num, const CallStack *stack) {
printf("%d%c%d%c", thread_num, kOutputSeparator, frame_index,
kOutputSeparator);
u_int64_t instruction_address = frame->ReturnAddress();
if (frame->module) {
assert(!frame->module->code_file().empty());
printf("%s", StripSeparator(PathnameStripper::File(
@ -289,13 +293,13 @@ static void PrintStackMachineReadable(int thread_num, const CallStack *stack) {
kOutputSeparator,
frame->source_line,
kOutputSeparator,
frame->instruction - frame->source_line_base);
instruction_address - frame->source_line_base);
} else {
printf("%c%c%c0x%" PRIx64,
kOutputSeparator, // empty source file
kOutputSeparator, // empty source line
kOutputSeparator,
frame->instruction - frame->function_base);
instruction_address - frame->function_base);
}
} else {
printf("%c%c%c%c0x%" PRIx64,
@ -303,7 +307,7 @@ static void PrintStackMachineReadable(int thread_num, const CallStack *stack) {
kOutputSeparator, // empty source file
kOutputSeparator, // empty source line
kOutputSeparator,
frame->instruction - frame->module->base_address());
instruction_address - frame->module->base_address());
}
} else {
// the printf before this prints a trailing separator for module name
@ -312,7 +316,7 @@ static void PrintStackMachineReadable(int thread_num, const CallStack *stack) {
kOutputSeparator, // empty source file
kOutputSeparator, // empty source line
kOutputSeparator,
frame->instruction);
instruction_address);
}
printf("\n");
}

19
src/processor/stackwalker_amd64.cc
View File

@ -33,6 +33,7 @@
//
// Author: Mark Mentovai, Ted Mielczarek
#include <assert.h>
#include "common/scoped_ptr.h"
#include "google_breakpad/processor/call_stack.h"
@ -100,6 +101,11 @@ StackwalkerAMD64::StackwalkerAMD64(const SystemInfo* system_info,
(sizeof(cfi_register_map_) / sizeof(cfi_register_map_[0]))) {
}
u_int64_t StackFrameAMD64::ReturnAddress() const
{
assert(context_validity & StackFrameAMD64::CONTEXT_VALID_RIP);
return context.rip;
}
StackFrame* StackwalkerAMD64::GetContextFrame() {
if (!context_) {
@ -226,14 +232,11 @@ StackFrame* StackwalkerAMD64::GetCallerFrame(const CallStack* stack) {
if (new_frame->context.rsp <= last_frame->context.rsp)
return NULL;
// new_frame->context.rip is the return address, which is one instruction
// past the CALL that caused us to arrive at the callee. Set
// new_frame->instruction to one less than that. This won't reference the
// beginning of the CALL instruction, but it's guaranteed to be within
// the CALL, which is sufficient to get the source line information to
// match up with the line that contains a function call. Callers that
// require the exact return address value may access the context.rip
// field of StackFrameAMD64.
// new_frame->context.rip is the return address, which is the instruction
// after the CALL that caused us to arrive at the callee. Set
// new_frame->instruction to one less than that, so it points within the
// CALL instruction. See StackFrame::instruction for details, and
// StackFrameAMD64::ReturnAddress.
new_frame->instruction = new_frame->context.rip - 1;
return new_frame.release();

20
src/processor/stackwalker_x86.cc
View File

@ -33,6 +33,7 @@
//
// Author: Mark Mentovai
#include <assert.h>
#include <string>
#include "common/scoped_ptr.h"
@ -105,6 +106,12 @@ StackFrameX86::~StackFrameX86() {
cfi_frame_info = NULL;
}
u_int64_t StackFrameX86::ReturnAddress() const
{
assert(context_validity & StackFrameX86::CONTEXT_VALID_EIP);
return context.eip;
}
StackFrame* StackwalkerX86::GetContextFrame() {
if (!context_) {
BPLOG(ERROR) << "Can't get context frame without context";
@ -597,14 +604,11 @@ StackFrame* StackwalkerX86::GetCallerFrame(const CallStack* stack) {
if (new_frame->context.esp <= last_frame->context.esp)
return NULL;
// new_frame->context.eip is the return address, which is one instruction
// past the CALL that caused us to arrive at the callee. Set
// new_frame->instruction to one less than that. This won't reference the
// beginning of the CALL instruction, but it's guaranteed to be within
// the CALL, which is sufficient to get the source line information to
// match up with the line that contains a function call. Callers that
// require the exact return address value may access the context.eip
// field of StackFrameX86.
// new_frame->context.eip is the return address, which is the instruction
// after the CALL that caused us to arrive at the callee. Set
// new_frame->instruction to one less than that, so it points within the
// CALL instruction. See StackFrame::instruction for details, and
// StackFrameAMD64::ReturnAddress.
new_frame->instruction = new_frame->context.eip - 1;
return new_frame.release();

6
src/processor/testdata/minidump2.stackwalk.machine_readable.out vendored
View File

@ -16,6 +16,6 @@ Module|kernel32.dll|5.1.2600.2945|kernel32.pdb|BCE8785C57B44245A669896B6A19B9542
Module|ntdll.dll|5.1.2600.2180|ntdll.pdb|36515FB5D04345E491F672FA2E2878C02|0x7c900000|0x7c9affff|0
0|0|test_app.exe|`anonymous namespace'::CrashFunction|c:\test_app.cc|58|0x3
0|1|test_app.exe|main|c:\test_app.cc|65|0x4
0|2|test_app.exe|__tmainCRTStartup|f:\sp\vctools\crt_bld\self_x86\crt\src\crt0.c|327|0x11
0|3|kernel32.dll|BaseProcessStart|||0x22
0|1|test_app.exe|main|c:\test_app.cc|65|0x5
0|2|test_app.exe|__tmainCRTStartup|f:\sp\vctools\crt_bld\self_x86\crt\src\crt0.c|327|0x12
0|3|kernel32.dll|BaseProcessStart|||0x23

6
src/processor/testdata/minidump2.stackwalk.out vendored
View File

@ -13,13 +13,13 @@ Thread 0 (crashed)
esi = 0x00000002 edi = 0x00000a28 eax = 0x00000045 ecx = 0x0012fe94
edx = 0x0042bc58 efl = 0x00010246
Found by: given as instruction pointer in context
1 test_app.exe!main [test_app.cc : 65 + 0x4]
1 test_app.exe!main [test_app.cc : 65 + 0x5]
eip = 0x00404200 esp = 0x0012fe90 ebp = 0x0012ff70
Found by: call frame info
2 test_app.exe!__tmainCRTStartup [crt0.c : 327 + 0x11]
2 test_app.exe!__tmainCRTStartup [crt0.c : 327 + 0x12]
eip = 0x004053ec esp = 0x0012ff78 ebp = 0x0012ffc0
Found by: call frame info
3 kernel32.dll!BaseProcessStart + 0x22
3 kernel32.dll!BaseProcessStart + 0x23
eip = 0x7c816fd7 esp = 0x0012ffc8 ebp = 0x0012fff0
Found by: call frame info