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third-party-mirror / breakpad / eb3bf491972182f705aaa117ea3ed20a7ecefd93 / . / src / processor / stackwalker_x86_unittest.cc
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// Copyright (c) 2010, 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.
// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
// stackwalker_x86_unittest.cc: Unit tests for StackwalkerX86 class.
#include <string>
#include <vector>
#include "breakpad_googletest_includes.h"
#include "common/test_assembler.h"
#include "common/using_std_string.h"
#include "google_breakpad/common/minidump_format.h"
#include "google_breakpad/processor/basic_source_line_resolver.h"
#include "google_breakpad/processor/call_stack.h"
#include "google_breakpad/processor/source_line_resolver_interface.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "processor/stackwalker_unittest_utils.h"
#include "processor/stackwalker_x86.h"
#include "processor/windows_frame_info.h"
using google_breakpad::BasicSourceLineResolver;
using google_breakpad::CallStack;
using google_breakpad::StackFrame;
using google_breakpad::StackFrameX86;
using google_breakpad::StackwalkerX86;
using google_breakpad::SystemInfo;
using google_breakpad::WindowsFrameInfo;
using google_breakpad::test_assembler::kLittleEndian;
using google_breakpad::test_assembler::Label;
using google_breakpad::test_assembler::Section;
using std::vector;
using testing::_;
using testing::Return;
using testing::SetArgumentPointee;
using testing::Test;
class StackwalkerX86Fixture {
public:
StackwalkerX86Fixture()
: stack_section(kLittleEndian),
// Give the two modules reasonable standard locations and names
// for tests to play with.
module1(0x40000000, 0x10000, "module1", "version1"),
module2(0x50000000, 0x10000, "module2", "version2"),
module3(0x771d0000, 0x180000, "module3", "version3"),
module4(0x75f90000, 0x46000, "module4", "version4"),
module5(0x75730000, 0x110000, "module5", "version5"),
module6(0x647f0000, 0x1ba8000, "module6", "version6") {
// Identify the system as a Linux system.
system_info.os = "Linux";
system_info.os_short = "linux";
system_info.os_version = "Salacious Skink";
system_info.cpu = "x86";
system_info.cpu_info = "";
// Put distinctive values in the raw CPU context.
BrandContext(&raw_context);
// Create some modules with some stock debugging information.
modules.Add(&module1);
modules.Add(&module2);
modules.Add(&module3);
modules.Add(&module4);
modules.Add(&module5);
modules.Add(&module6);
// By default, none of the modules have symbol info; call
// SetModuleSymbols to override this.
EXPECT_CALL(supplier, GetCStringSymbolData(_, _, _, _))
.WillRepeatedly(Return(MockSymbolSupplier::NOT_FOUND));
}
// Set the Breakpad symbol information that supplier should return for
// MODULE to INFO.
void SetModuleSymbols(MockCodeModule *module, const string &info) {
char *buffer = supplier.CopySymbolDataAndOwnTheCopy(info);
EXPECT_CALL(supplier, GetCStringSymbolData(module, &system_info, _, _))
.WillRepeatedly(DoAll(SetArgumentPointee<3>(buffer),
Return(MockSymbolSupplier::FOUND)));
}
// Populate stack_region with the contents of stack_section. Use
// stack_section.start() as the region's starting address.
void RegionFromSection() {
string contents;
ASSERT_TRUE(stack_section.GetContents(&contents));
stack_region.Init(stack_section.start().Value(), contents);
}
// Fill RAW_CONTEXT with pseudo-random data, for round-trip checking.
void BrandContext(MDRawContextX86 *raw_context) {
u_int8_t x = 173;
for (size_t i = 0; i < sizeof(*raw_context); i++)
reinterpret_cast<u_int8_t *>(raw_context)[i] = (x += 17);
}
SystemInfo system_info;
MDRawContextX86 raw_context;
Section stack_section;
MockMemoryRegion stack_region;
MockCodeModule module1;
MockCodeModule module2;
MockCodeModule module3;
MockCodeModule module4;
MockCodeModule module5;
MockCodeModule module6;
MockCodeModules modules;
MockSymbolSupplier supplier;
BasicSourceLineResolver resolver;
CallStack call_stack;
const vector<StackFrame *> *frames;
};
class SanityCheck: public StackwalkerX86Fixture, public Test { };
TEST_F(SanityCheck, NoResolver) {
stack_section.start() = 0x80000000;
stack_section.D32(0).D32(0); // end-of-stack marker
RegionFromSection();
raw_context.eip = 0x40000200;
raw_context.ebp = 0x80000000;
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
NULL, NULL);
// This should succeed, even without a resolver or supplier.
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
StackFrameX86 *frame = static_cast<StackFrameX86 *>(frames->at(0));
// Check that the values from the original raw context made it
// through to the context in the stack frame.
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetContextFrame: public StackwalkerX86Fixture, public Test { };
TEST_F(GetContextFrame, Simple) {
stack_section.start() = 0x80000000;
stack_section.D32(0).D32(0); // end-of-stack marker
RegionFromSection();
raw_context.eip = 0x40000200;
raw_context.ebp = 0x80000000;
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
StackFrameX86 *frame = static_cast<StackFrameX86 *>(frames->at(0));
// Check that the values from the original raw context made it
// through to the context in the stack frame.
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetCallerFrame: public StackwalkerX86Fixture, public Test { };
// Walk a traditional frame. A traditional frame saves the caller's
// %ebp just below the return address, and has its own %ebp pointing
// at the saved %ebp.
TEST_F(GetCallerFrame, Traditional) {
stack_section.start() = 0x80000000;
Label frame0_ebp, frame1_ebp;
stack_section
.Append(12, 0) // frame 0: space
.Mark(&frame0_ebp) // frame 0 %ebp points here
.D32(frame1_ebp) // frame 0: saved %ebp
.D32(0x40008679) // frame 0: return address
.Append(8, 0) // frame 1: space
.Mark(&frame1_ebp) // frame 1 %ebp points here
.D32(0) // frame 1: saved %ebp (stack end)
.D32(0); // frame 1: return address (stack end)
RegionFromSection();
raw_context.eip = 0x4000c7a5;
raw_context.esp = stack_section.start().Value();
raw_context.ebp = frame0_ebp.Value();
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
EXPECT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x4000c7a5U, frame0->instruction);
EXPECT_EQ(0x4000c7a5U, frame0->context.eip);
EXPECT_EQ(frame0_ebp.Value(), frame0->context.ebp);
EXPECT_EQ(NULL, frame0->windows_frame_info);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x40008679U, frame1->instruction + 1);
EXPECT_EQ(0x40008679U, frame1->context.eip);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// Walk a traditional frame, but use a bogus %ebp value, forcing a scan
// of the stack for something that looks like a return address.
TEST_F(GetCallerFrame, TraditionalScan) {
stack_section.start() = 0x80000000;
Label frame1_ebp;
stack_section
// frame 0
.D32(0xf065dc76) // locals area:
.D32(0x46ee2167) // garbage that doesn't look like
.D32(0xbab023ec) // a return address
.D32(frame1_ebp) // saved %ebp (%ebp fails to point here, forcing scan)
.D32(0x4000129d) // return address
// frame 1
.Append(8, 0) // space
.Mark(&frame1_ebp) // %ebp points here
.D32(0) // saved %ebp (stack end)
.D32(0); // return address (stack end)
RegionFromSection();
raw_context.eip = 0x4000f49d;
raw_context.esp = stack_section.start().Value();
// Make the frame pointer bogus, to make the stackwalker scan the stack
// for something that looks like a return address.
raw_context.ebp = 0xd43eed6e;
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x4000f49dU, frame0->instruction);
EXPECT_EQ(0x4000f49dU, frame0->context.eip);
EXPECT_EQ(stack_section.start().Value(), frame0->context.esp);
EXPECT_EQ(0xd43eed6eU, frame0->context.ebp);
EXPECT_EQ(NULL, frame0->windows_frame_info);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
// I'd argue that CONTEXT_VALID_EBP shouldn't be here, since the
// walker does not actually fetch the EBP after a scan (forcing the
// next frame to be scanned as well). But let's grandfather the existing
// behavior in for now.
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x4000129dU, frame1->instruction + 1);
EXPECT_EQ(0x4000129dU, frame1->context.eip);
EXPECT_EQ(0x80000014U, frame1->context.esp);
EXPECT_EQ(0xd43eed6eU, frame1->context.ebp);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// Force scanning for a return address a long way down the stack
TEST_F(GetCallerFrame, TraditionalScanLongWay) {
stack_section.start() = 0x80000000;
Label frame1_ebp;
stack_section
// frame 0
.D32(0xf065dc76) // locals area:
.D32(0x46ee2167) // garbage that doesn't look like
.D32(0xbab023ec) // a return address
.Append(20 * 4, 0) // a bunch of space
.D32(frame1_ebp) // saved %ebp (%ebp fails to point here, forcing scan)
.D32(0x4000129d) // return address
// frame 1
.Append(8, 0) // space
.Mark(&frame1_ebp) // %ebp points here
.D32(0) // saved %ebp (stack end)
.D32(0); // return address (stack end)
RegionFromSection();
raw_context.eip = 0x4000f49d;
raw_context.esp = stack_section.start().Value();
// Make the frame pointer bogus, to make the stackwalker scan the stack
// for something that looks like a return address.
raw_context.ebp = 0xd43eed6e;
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x4000f49dU, frame0->instruction);
EXPECT_EQ(0x4000f49dU, frame0->context.eip);
EXPECT_EQ(stack_section.start().Value(), frame0->context.esp);
EXPECT_EQ(0xd43eed6eU, frame0->context.ebp);
EXPECT_EQ(NULL, frame0->windows_frame_info);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
// I'd argue that CONTEXT_VALID_EBP shouldn't be here, since the
// walker does not actually fetch the EBP after a scan (forcing the
// next frame to be scanned as well). But let's grandfather the existing
// behavior in for now.
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x4000129dU, frame1->instruction + 1);
EXPECT_EQ(0x4000129dU, frame1->context.eip);
EXPECT_EQ(0x80000064U, frame1->context.esp);
EXPECT_EQ(0xd43eed6eU, frame1->context.ebp);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// Use Windows frame data (a "STACK WIN 4" record, from a
// FrameTypeFrameData DIA record) to walk a stack frame.
TEST_F(GetCallerFrame, WindowsFrameData) {
SetModuleSymbols(&module1,
"STACK WIN 4 aa85 176 0 0 4 10 4 0 1"
" $T2 $esp .cbSavedRegs + ="
" $T0 .raSearchStart ="
" $eip $T0 ^ ="
" $esp $T0 4 + ="
" $ebx $T2 4 - ^ ="
" $edi $T2 8 - ^ ="
" $esi $T2 12 - ^ ="
" $ebp $T2 16 - ^ =\n");
Label frame1_esp, frame1_ebp;
stack_section.start() = 0x80000000;
stack_section
// frame 0
.D32(frame1_ebp) // saved regs: %ebp
.D32(0xa7120d1a) // %esi
.D32(0x630891be) // %edi
.D32(0x9068a878) // %ebx
.D32(0xa08ea45f) // locals: unused
.D32(0x40001350) // return address
// frame 1
.Mark(&frame1_esp)
.Append(12, 0) // empty space
.Mark(&frame1_ebp)
.D32(0) // saved %ebp (stack end)
.D32(0); // saved %eip (stack end)
RegionFromSection();
raw_context.eip = 0x4000aa85;
raw_context.esp = stack_section.start().Value();
raw_context.ebp = 0xf052c1de; // should not be needed to walk frame
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x4000aa85U, frame0->instruction);
EXPECT_EQ(0x4000aa85U, frame0->context.eip);
EXPECT_EQ(stack_section.start().Value(), frame0->context.esp);
EXPECT_EQ(0xf052c1deU, frame0->context.ebp);
EXPECT_TRUE(frame0->windows_frame_info != NULL);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP
| StackFrameX86::CONTEXT_VALID_EBX
| StackFrameX86::CONTEXT_VALID_ESI
| StackFrameX86::CONTEXT_VALID_EDI),
frame1->context_validity);
EXPECT_EQ(0x40001350U, frame1->instruction + 1);
EXPECT_EQ(0x40001350U, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_EQ(0x9068a878U, frame1->context.ebx);
EXPECT_EQ(0xa7120d1aU, frame1->context.esi);
EXPECT_EQ(0x630891beU, frame1->context.edi);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// Use Windows frame data (a "STACK WIN 4" record, from a
// FrameTypeFrameData DIA record) to walk a stack frame where the stack
// is aligned and we must search
TEST_F(GetCallerFrame, WindowsFrameDataAligned) {
SetModuleSymbols(&module1,
"STACK WIN 4 aa85 176 0 0 4 4 8 0 1"
" $T1 .raSearch ="
" $T0 $T1 4 - 8 @ ="
" $ebp $T1 4 - ^ ="
" $eip $T1 ^ ="
" $esp $T1 4 + =");
Label frame1_esp, frame1_ebp;
stack_section.start() = 0x80000000;
stack_section
// frame 0
.D32(0x0ffa0ffa) // unused saved register
.D32(0xdeaddead) // locals
.D32(0xbeefbeef)
.D32(0) // 8-byte alignment
.D32(frame1_ebp)
.D32(0x5000129d) // return address
// frame 1
.Mark(&frame1_esp)
.D32(0x1) // parameter
.Mark(&frame1_ebp)
.D32(0) // saved %ebp (stack end)
.D32(0); // saved %eip (stack end)
RegionFromSection();
raw_context.eip = 0x4000aa85;
raw_context.esp = stack_section.start().Value();
raw_context.ebp = 0xf052c1de; // should not be needed to walk frame
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x4000aa85U, frame0->instruction);
EXPECT_EQ(0x4000aa85U, frame0->context.eip);
EXPECT_EQ(stack_section.start().Value(), frame0->context.esp);
EXPECT_EQ(0xf052c1deU, frame0->context.ebp);
EXPECT_TRUE(frame0->windows_frame_info != NULL);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x5000129dU, frame1->instruction + 1);
EXPECT_EQ(0x5000129dU, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// Use Windows frame data (a "STACK WIN 4" record, from a
// FrameTypeFrameData DIA record) to walk a frame, and depend on the
// parameter size from the callee as well.
TEST_F(GetCallerFrame, WindowsFrameDataParameterSize) {
SetModuleSymbols(&module1, "FUNC 1000 100 c module1::wheedle\n");
SetModuleSymbols(&module2,
// Note bogus parameter size in FUNC record; the stack walker
// should prefer the STACK WIN record, and see '4' below.
"FUNC aa85 176 beef module2::whine\n"
"STACK WIN 4 aa85 176 0 0 4 10 4 0 1"
" $T2 $esp .cbLocals + .cbSavedRegs + ="
" $T0 .raSearchStart ="
" $eip $T0 ^ ="
" $esp $T0 4 + ="
" $ebp $T0 20 - ^ ="
" $ebx $T0 8 - ^ =\n");
Label frame0_esp, frame0_ebp;
Label frame1_esp;
Label frame2_esp, frame2_ebp;
stack_section.start() = 0x80000000;
stack_section
// frame 0, in module1::wheedle. Traditional frame.
.Mark(&frame0_esp)
.Append(16, 0) // frame space
.Mark(&frame0_ebp)
.D32(0x6fa902e0) // saved %ebp. Not a frame pointer.
.D32(0x5000aa95) // return address, in module2::whine
// frame 1, in module2::whine. FrameData frame.
.Mark(&frame1_esp)
.D32(0xbaa0cb7a) // argument 3 passed to module1::wheedle
.D32(0xbdc92f9f) // argument 2
.D32(0x0b1d8442) // argument 1
.D32(frame2_ebp) // saved %ebp
.D32(0xb1b90a15) // unused
.D32(0xf18e072d) // unused
.D32(0x2558c7f3) // saved %ebx
.D32(0x0365e25e) // unused
.D32(0x2a179e38) // return address; $T0 points here
// frame 2, in no module
.Mark(&frame2_esp)
.Append(12, 0) // empty space
.Mark(&frame2_ebp)
.D32(0) // saved %ebp (stack end)
.D32(0); // saved %eip (stack end)
RegionFromSection();
raw_context.eip = 0x40001004; // in module1::wheedle
raw_context.esp = stack_section.start().Value();
raw_context.ebp = frame0_ebp.Value();
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(3U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x40001004U, frame0->instruction);
EXPECT_EQ(0x40001004U, frame0->context.eip);
EXPECT_EQ(frame0_esp.Value(), frame0->context.esp);
EXPECT_EQ(frame0_ebp.Value(), frame0->context.ebp);
EXPECT_EQ(&module1, frame0->module);
EXPECT_EQ("module1::wheedle", frame0->function_name);
EXPECT_EQ(0x40001000U, frame0->function_base);
// The FUNC record for module1::wheedle should have produced a
// WindowsFrameInfo structure with only the parameter size valid.
ASSERT_TRUE(frame0->windows_frame_info != NULL);
EXPECT_EQ(WindowsFrameInfo::VALID_PARAMETER_SIZE,
frame0->windows_frame_info->valid);
EXPECT_EQ(WindowsFrameInfo::STACK_INFO_UNKNOWN,
frame0->windows_frame_info->type_);
EXPECT_EQ(12U, frame0->windows_frame_info->parameter_size);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x5000aa95U, frame1->instruction + 1);
EXPECT_EQ(0x5000aa95U, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(0x6fa902e0U, frame1->context.ebp);
EXPECT_EQ(&module2, frame1->module);
EXPECT_EQ("module2::whine", frame1->function_name);
EXPECT_EQ(0x5000aa85U, frame1->function_base);
ASSERT_TRUE(frame1->windows_frame_info != NULL);
EXPECT_EQ(WindowsFrameInfo::VALID_ALL, frame1->windows_frame_info->valid);
EXPECT_EQ(WindowsFrameInfo::STACK_INFO_FRAME_DATA,
frame1->windows_frame_info->type_);
// This should not see the 0xbeef parameter size from the FUNC
// record, but should instead see the STACK WIN record.
EXPECT_EQ(4U, frame1->windows_frame_info->parameter_size);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame2 = static_cast<StackFrameX86 *>(frames->at(2));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame2->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP
| StackFrameX86::CONTEXT_VALID_EBX),
frame2->context_validity);
EXPECT_EQ(0x2a179e38U, frame2->instruction + 1);
EXPECT_EQ(0x2a179e38U, frame2->context.eip);
EXPECT_EQ(frame2_esp.Value(), frame2->context.esp);
EXPECT_EQ(frame2_ebp.Value(), frame2->context.ebp);
EXPECT_EQ(0x2558c7f3U, frame2->context.ebx);
EXPECT_EQ(NULL, frame2->module);
EXPECT_EQ(NULL, frame2->windows_frame_info);
}
}
// Use Windows frame data (a "STACK WIN 4" record, from a
// FrameTypeFrameData DIA record) to walk a stack frame, where the
// expression fails to yield both an $eip and an $ebp value, and the stack
// walker must scan.
TEST_F(GetCallerFrame, WindowsFrameDataScan) {
SetModuleSymbols(&module1,
"STACK WIN 4 c8c 111 0 0 4 10 4 0 1 bad program string\n");
// Mark frame 1's PC as the end of the stack.
SetModuleSymbols(&module2,
"FUNC 7c38 accf 0 module2::function\n"
"STACK WIN 4 7c38 accf 0 0 4 10 4 0 1 $eip 0 = $ebp 0 =\n");
Label frame1_esp;
stack_section.start() = 0x80000000;
stack_section
// frame 0
.Append(16, 0x2a) // unused, garbage
.D32(0x50007ce9) // return address
// frame 1
.Mark(&frame1_esp)
.Append(8, 0); // empty space
RegionFromSection();
raw_context.eip = 0x40000c9c;
raw_context.esp = stack_section.start().Value();
raw_context.ebp = 0x2ae314cd; // should not be needed to walk frame
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x40000c9cU, frame0->instruction);
EXPECT_EQ(0x40000c9cU, frame0->context.eip);
EXPECT_EQ(stack_section.start().Value(), frame0->context.esp);
EXPECT_EQ(0x2ae314cdU, frame0->context.ebp);
EXPECT_TRUE(frame0->windows_frame_info != NULL);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
// I'd argue that CONTEXT_VALID_EBP shouldn't be here, since the walker
// does not actually fetch the EBP after a scan (forcing the next frame
// to be scanned as well). But let's grandfather the existing behavior in
// for now.
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x50007ce9U, frame1->instruction + 1);
EXPECT_EQ(0x50007ce9U, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_TRUE(frame1->windows_frame_info != NULL);
}
}
// Use Windows frame data (a "STACK WIN 4" record, from a
// FrameTypeFrameData DIA record) to walk a stack frame, where the
// expression yields an $eip that falls outside of any module, and the
// stack walker must scan.
TEST_F(GetCallerFrame, WindowsFrameDataBadEIPScan) {
SetModuleSymbols(&module1,
"STACK WIN 4 6e6 e7 0 0 0 8 4 0 1"
// A traditional frame, actually.
" $eip $ebp 4 + ^ = $esp $ebp 8 + = $ebp $ebp ^ =\n");
// Mark frame 1's PC as the end of the stack.
SetModuleSymbols(&module2,
"FUNC cfdb 8406 0 module2::function\n"
"STACK WIN 4 cfdb 8406 0 0 0 0 0 0 1 $eip 0 = $ebp 0 =\n");
stack_section.start() = 0x80000000;
// In this stack, the context's %ebp is pointing at the wrong place, so
// the stack walker needs to scan to find the return address, and then
// scan again to find the caller's saved %ebp.
Label frame0_ebp, frame1_ebp, frame1_esp;
stack_section
// frame 0
.Append(8, 0x2a) // garbage
.Mark(&frame0_ebp) // frame 0 %ebp points here, but should point
// at *** below
// The STACK WIN record says that the following two values are
// frame 1's saved %ebp and return address, but the %ebp is wrong;
// they're garbage. The stack walker will scan for the right values.
.D32(0x3d937b2b) // alleged to be frame 1's saved %ebp
.D32(0x17847f5b) // alleged to be frame 1's return address
.D32(frame1_ebp) // frame 1's real saved %ebp; scan will find
.D32(0x2b2b2b2b) // first word of realigned register save area
// *** frame 0 %ebp ought to be pointing here
.D32(0x2c2c2c2c) // realigned locals area
.D32(0x5000d000) // frame 1's real saved %eip; scan will find
// Frame 1, in module2::function. The STACK WIN record describes
// this as the oldest frame, without referring to its contents, so
// we needn't to provide any actual data here.
.Mark(&frame1_esp)
.Mark(&frame1_ebp) // frame 1 %ebp points here
// A dummy value for frame 1's %ebp to point at. The scan recognizes the
// saved %ebp because it points to a valid word in the stack memory region.
.D32(0x2d2d2d2d);
RegionFromSection();
raw_context.eip = 0x40000700;
raw_context.esp = stack_section.start().Value();
raw_context.ebp = frame0_ebp.Value();
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x40000700U, frame0->instruction);
EXPECT_EQ(0x40000700U, frame0->context.eip);
EXPECT_EQ(stack_section.start().Value(), frame0->context.esp);
EXPECT_EQ(frame0_ebp.Value(), frame0->context.ebp);
EXPECT_TRUE(frame0->windows_frame_info != NULL);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI_SCAN, frame1->trust);
// I'd argue that CONTEXT_VALID_EBP shouldn't be here, since the
// walker does not actually fetch the EBP after a scan (forcing the
// next frame to be scanned as well). But let's grandfather the existing
// behavior in for now.
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x5000d000U, frame1->instruction + 1);
EXPECT_EQ(0x5000d000U, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_TRUE(frame1->windows_frame_info != NULL);
}
}
// Use Windows FrameTypeFPO data to walk a stack frame for a function that
// does not modify %ebp from the value it had in the caller.
TEST_F(GetCallerFrame, WindowsFPOUnchangedEBP) {
SetModuleSymbols(&module1,
// Note bogus parameter size in FUNC record; the walker
// should prefer the STACK WIN record, and see the '8' below.
"FUNC e8a8 100 feeb module1::discombobulated\n"
"STACK WIN 0 e8a8 100 0 0 8 4 10 0 0 0\n");
Label frame0_esp;
Label frame1_esp, frame1_ebp;
stack_section.start() = 0x80000000;
stack_section
// frame 0, in module1::wheedle. FrameTypeFPO (STACK WIN 0) frame.
.Mark(&frame0_esp)
// no outgoing parameters; this is the youngest frame.
.D32(0x7c521352) // four bytes of saved registers
.Append(0x10, 0x42) // local area
.D32(0x40009b5b) // return address, in module1, no function
// frame 1, in module1, no function.
.Mark(&frame1_esp)
.D32(0xf60ea7fc) // junk
.Mark(&frame1_ebp)
.D32(0) // saved %ebp (stack end)
.D32(0); // saved %eip (stack end)
RegionFromSection();
raw_context.eip = 0x4000e8b8; // in module1::whine
raw_context.esp = stack_section.start().Value();
// Frame pointer unchanged from caller.
raw_context.ebp = frame1_ebp.Value();
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x4000e8b8U, frame0->instruction);
EXPECT_EQ(0x4000e8b8U, frame0->context.eip);
EXPECT_EQ(frame0_esp.Value(), frame0->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame0->context.ebp); // unchanged from caller
EXPECT_EQ(&module1, frame0->module);
EXPECT_EQ("module1::discombobulated", frame0->function_name);
EXPECT_EQ(0x4000e8a8U, frame0->function_base);
// The STACK WIN record for module1::discombobulated should have
// produced a fully populated WindowsFrameInfo structure.
ASSERT_TRUE(frame0->windows_frame_info != NULL);
EXPECT_EQ(WindowsFrameInfo::VALID_ALL, frame0->windows_frame_info->valid);
EXPECT_EQ(WindowsFrameInfo::STACK_INFO_FPO,
frame0->windows_frame_info->type_);
EXPECT_EQ(0x10U, frame0->windows_frame_info->local_size);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x40009b5bU, frame1->instruction + 1);
EXPECT_EQ(0x40009b5bU, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_EQ(&module1, frame1->module);
EXPECT_EQ("", frame1->function_name);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// Use Windows FrameTypeFPO data to walk a stack frame for a function
// that uses %ebp for its own purposes, saving the value it had in the
// caller in the standard place in the saved register area.
TEST_F(GetCallerFrame, WindowsFPOUsedEBP) {
SetModuleSymbols(&module1,
// Note bogus parameter size in FUNC record; the walker
// should prefer the STACK WIN record, and see the '8' below.
"FUNC 9aa8 e6 abbe module1::RaisedByTheAliens\n"
"STACK WIN 0 9aa8 e6 a 0 10 8 4 0 0 1\n");
Label frame0_esp;
Label frame1_esp, frame1_ebp;
stack_section.start() = 0x80000000;
stack_section
// frame 0, in module1::wheedle. FrameTypeFPO (STACK WIN 0) frame.
.Mark(&frame0_esp)
// no outgoing parameters; this is the youngest frame.
.D32(frame1_ebp) // saved register area: saved %ebp
.D32(0xb68bd5f9) // saved register area: something else
.D32(0xd25d05fc) // local area
.D32(0x4000debe) // return address, in module1, no function
// frame 1, in module1, no function.
.Mark(&frame1_esp)
.D32(0xf0c9a974) // junk
.Mark(&frame1_ebp)
.D32(0) // saved %ebp (stack end)
.D32(0); // saved %eip (stack end)
RegionFromSection();
raw_context.eip = 0x40009ab8; // in module1::RaisedByTheAliens
raw_context.esp = stack_section.start().Value();
// RaisedByTheAliens uses %ebp for its own mysterious purposes.
raw_context.ebp = 0xecbdd1a5;
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x40009ab8U, frame0->instruction);
EXPECT_EQ(0x40009ab8U, frame0->context.eip);
EXPECT_EQ(frame0_esp.Value(), frame0->context.esp);
EXPECT_EQ(0xecbdd1a5, frame0->context.ebp);
EXPECT_EQ(&module1, frame0->module);
EXPECT_EQ("module1::RaisedByTheAliens", frame0->function_name);
EXPECT_EQ(0x40009aa8U, frame0->function_base);
// The STACK WIN record for module1::RaisedByTheAliens should have
// produced a fully populated WindowsFrameInfo structure.
ASSERT_TRUE(frame0->windows_frame_info != NULL);
EXPECT_EQ(WindowsFrameInfo::VALID_ALL, frame0->windows_frame_info->valid);
EXPECT_EQ(WindowsFrameInfo::STACK_INFO_FPO,
frame0->windows_frame_info->type_);
EXPECT_EQ("", frame0->windows_frame_info->program_string);
EXPECT_TRUE(frame0->windows_frame_info->allocates_base_pointer);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x4000debeU, frame1->instruction + 1);
EXPECT_EQ(0x4000debeU, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_EQ(&module1, frame1->module);
EXPECT_EQ("", frame1->function_name);
EXPECT_EQ(NULL, frame1->windows_frame_info);
}
}
// This is a regression unit test which covers a bug which has to do with
// FPO-optimized Windows system call stubs in the context frame. There is
// a more recent Windows system call dispatch mechanism which differs from
// the one which is being tested here. The newer system call dispatch
// mechanism creates an extra context frame (KiFastSystemCallRet).
TEST_F(GetCallerFrame, WindowsFPOSystemCall) {
SetModuleSymbols(&module3, // ntdll.dll
"PUBLIC 1f8ac c ZwWaitForSingleObject\n"
"STACK WIN 0 1f8ac 1b 0 0 c 0 0 0 0 0\n");
SetModuleSymbols(&module4, // kernelbase.dll
"PUBLIC 109f9 c WaitForSingleObjectEx\n"
"PUBLIC 36590 0 _except_handler4\n"
"STACK WIN 4 109f9 df c 0 c c 48 0 1 $T0 $ebp = $eip "
"$T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L "
"$T0 .cbSavedRegs - = $P $T0 8 + .cbParams + =\n"
"STACK WIN 4 36590 154 17 0 10 0 14 0 1 $T0 $ebp = $eip "
"$T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L $T0 "
".cbSavedRegs - = $P $T0 8 + .cbParams + =\n");
SetModuleSymbols(&module5, // kernel32.dll
"PUBLIC 11136 8 WaitForSingleObject\n"
"PUBLIC 11151 c WaitForSingleObjectExImplementation\n"
"STACK WIN 4 11136 16 5 0 8 0 0 0 1 $T0 $ebp = $eip "
"$T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L "
"$T0 .cbSavedRegs - = $P $T0 8 + .cbParams + =\n"
"STACK WIN 4 11151 7a 5 0 c 0 0 0 1 $T0 $ebp = $eip "
"$T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L "
"$T0 .cbSavedRegs - = $P $T0 8 + .cbParams + =\n");
SetModuleSymbols(&module6, // chrome.dll
"FILE 7038 some_file_name.h\n"
"FILE 839776 some_file_name.cc\n"
"FUNC 217fda 17 4 function_217fda\n"
"217fda 4 102 839776\n"
"FUNC 217ff1 a 4 function_217ff1\n"
"217ff1 0 594 7038\n"
"217ff1 a 596 7038\n"
"STACK WIN 0 217ff1 a 0 0 4 0 0 0 0 0\n");
Label frame0_esp, frame1_esp;
Label frame1_ebp, frame2_ebp, frame3_ebp;
stack_section.start() = 0x002ff290;
stack_section
.Mark(&frame0_esp)
.D32(0x771ef8c1) // EIP in frame 0 (system call)
.D32(0x75fa0a91) // return address of frame 0
.Mark(&frame1_esp)
.D32(0x000017b0) // args to child
.D32(0x00000000)
.D32(0x002ff2d8)
.D32(0x88014a2e)
.D32(0x002ff364)
.D32(0x000017b0)
.D32(0x00000000)
.D32(0x00000024)
.D32(0x00000001)
.D32(0x00000000)
.D32(0x00000000)
.D32(0x00000000)
.D32(0x00000000)
.D32(0x00000000)
.D32(0x00000000)
.D32(0x00000000)
.D32(0x9e3b9800)
.D32(0xfffffff7)
.D32(0x00000000)
.D32(0x002ff2a4)
.D32(0x64a07ff1) // random value to be confused with a return address
.D32(0x002ff8dc)
.D32(0x75fc6590) // random value to be confused with a return address
.D32(0xfdd2c6ea)
.D32(0x00000000)
.Mark(&frame1_ebp)
.D32(frame2_ebp) // Child EBP
.D32(0x75741194) // return address of frame 1
.D32(0x000017b0) // args to child
.D32(0x0036ee80)
.D32(0x00000000)
.D32(0x65bc7d14)
.Mark(&frame2_ebp)
.D32(frame3_ebp) // Child EBP
.D32(0x75741148) // return address of frame 2
.D32(0x000017b0) // args to child
.D32(0x0036ee80)
.D32(0x00000000)
.Mark(&frame3_ebp)
.D32(0) // saved %ebp (stack end)
.D32(0); // saved %eip (stack end)
RegionFromSection();
raw_context.eip = 0x771ef8c1; // in ntdll::ZwWaitForSingleObject
raw_context.esp = stack_section.start().Value();
ASSERT_TRUE(raw_context.esp == frame0_esp.Value());
raw_context.ebp = frame1_ebp.Value();
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(4U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ(0x771ef8c1U, frame0->instruction);
EXPECT_EQ(0x771ef8c1U, frame0->context.eip);
EXPECT_EQ(frame0_esp.Value(), frame0->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame0->context.ebp);
EXPECT_EQ(&module3, frame0->module);
EXPECT_EQ("ZwWaitForSingleObject", frame0->function_name);
// The STACK WIN record for module3!ZwWaitForSingleObject should have
// produced a fully populated WindowsFrameInfo structure.
ASSERT_TRUE(frame0->windows_frame_info != NULL);
EXPECT_EQ(WindowsFrameInfo::VALID_ALL, frame0->windows_frame_info->valid);
EXPECT_EQ(WindowsFrameInfo::STACK_INFO_FPO,
frame0->windows_frame_info->type_);
EXPECT_EQ("", frame0->windows_frame_info->program_string);
EXPECT_FALSE(frame0->windows_frame_info->allocates_base_pointer);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP
| StackFrameX86::CONTEXT_VALID_ESP
| StackFrameX86::CONTEXT_VALID_EBP),
frame1->context_validity);
EXPECT_EQ(0x75fa0a91U, frame1->instruction + 1);
EXPECT_EQ(0x75fa0a91U, frame1->context.eip);
EXPECT_EQ(frame1_esp.Value(), frame1->context.esp);
EXPECT_EQ(frame1_ebp.Value(), frame1->context.ebp);
EXPECT_EQ(&module4, frame1->module);
EXPECT_EQ("WaitForSingleObjectEx", frame1->function_name);
// The STACK WIN record for module4!WaitForSingleObjectEx should have
// produced a fully populated WindowsFrameInfo structure.
ASSERT_TRUE(frame1->windows_frame_info != NULL);
EXPECT_EQ(WindowsFrameInfo::VALID_ALL, frame1->windows_frame_info->valid);
EXPECT_EQ(WindowsFrameInfo::STACK_INFO_FRAME_DATA,
frame1->windows_frame_info->type_);
EXPECT_EQ("$T0 $ebp = $eip $T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = $L "
"$T0 .cbSavedRegs - = $P $T0 8 + .cbParams + =",
frame1->windows_frame_info->program_string);
EXPECT_FALSE(frame1->windows_frame_info->allocates_base_pointer);
}
}
struct CFIFixture: public StackwalkerX86Fixture {
CFIFixture() {
// Provide a bunch of STACK CFI records; individual tests walk to the
// caller from every point in this series, expecting to find the same
// set of register values.
SetModuleSymbols(&module1,
// The youngest frame's function.
"FUNC 4000 1000 10 enchiridion\n"
// Initially, just a return address.
"STACK CFI INIT 4000 100 .cfa: $esp 4 + .ra: .cfa 4 - ^\n"
// Push %ebx.
"STACK CFI 4001 .cfa: $esp 8 + $ebx: .cfa 8 - ^\n"
// Move %esi into %ebx. Weird, but permitted.
"STACK CFI 4002 $esi: $ebx\n"
// Allocate frame space, and save %edi.
"STACK CFI 4003 .cfa: $esp 20 + $edi: .cfa 16 - ^\n"
// Put the return address in %edi.
"STACK CFI 4005 .ra: $edi\n"
// Save %ebp, and use it as a frame pointer.
"STACK CFI 4006 .cfa: $ebp 8 + $ebp: .cfa 12 - ^\n"
// The calling function.
"FUNC 5000 1000 10 epictetus\n"
// Mark it as end of stack.
"STACK CFI INIT 5000 1000 .cfa: $esp .ra 0\n");
// Provide some distinctive values for the caller's registers.
expected.esp = 0x80000000;
expected.eip = 0x40005510;
expected.ebp = 0xc0d4aab9;
expected.ebx = 0x60f20ce6;
expected.esi = 0x53d1379d;
expected.edi = 0xafbae234;
// By default, registers are unchanged.
raw_context = expected;
}
// Walk the stack, using stack_section as the contents of the stack
// and raw_context as the current register values. (Set
// raw_context.esp to the stack's starting address.) Expect two
// stack frames; in the older frame, expect the callee-saves
// registers to have values matching those in 'expected'.
void CheckWalk() {
RegionFromSection();
raw_context.esp = stack_section.start().Value();
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameX86 *frame0 = static_cast<StackFrameX86 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameX86::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_EQ("enchiridion", frame0->function_name);
EXPECT_EQ(0x40004000U, frame0->function_base);
ASSERT_TRUE(frame0->windows_frame_info != NULL);
ASSERT_EQ(WindowsFrameInfo::VALID_PARAMETER_SIZE,
frame0->windows_frame_info->valid);
ASSERT_TRUE(frame0->cfi_frame_info != NULL);
}
{ // To avoid reusing locals by mistake
StackFrameX86 *frame1 = static_cast<StackFrameX86 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
ASSERT_EQ((StackFrameX86::CONTEXT_VALID_EIP |
StackFrameX86::CONTEXT_VALID_ESP |
StackFrameX86::CONTEXT_VALID_EBP |
StackFrameX86::CONTEXT_VALID_EBX |
StackFrameX86::CONTEXT_VALID_ESI |
StackFrameX86::CONTEXT_VALID_EDI),
frame1->context_validity);
EXPECT_EQ(expected.eip, frame1->context.eip);
EXPECT_EQ(expected.esp, frame1->context.esp);
EXPECT_EQ(expected.ebp, frame1->context.ebp);
EXPECT_EQ(expected.ebx, frame1->context.ebx);
EXPECT_EQ(expected.esi, frame1->context.esi);
EXPECT_EQ(expected.edi, frame1->context.edi);
EXPECT_EQ("epictetus", frame1->function_name);
}
}
// The values the stack walker should find for the caller's registers.
MDRawContextX86 expected;
};
class CFI: public CFIFixture, public Test { };
TEST_F(CFI, At4000) {
Label frame1_esp = expected.esp;
stack_section
.D32(0x40005510) // return address
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004000;
CheckWalk();
}
TEST_F(CFI, At4001) {
Label frame1_esp = expected.esp;
stack_section
.D32(0x60f20ce6) // saved %ebx
.D32(0x40005510) // return address
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004001;
raw_context.ebx = 0x91aa9a8b; // callee's %ebx value
CheckWalk();
}
TEST_F(CFI, At4002) {
Label frame1_esp = expected.esp;
stack_section
.D32(0x60f20ce6) // saved %ebx
.D32(0x40005510) // return address
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004002;
raw_context.ebx = 0x53d1379d; // saved %esi
raw_context.esi = 0xa5c790ed; // callee's %esi value
CheckWalk();
}
TEST_F(CFI, At4003) {
Label frame1_esp = expected.esp;
stack_section
.D32(0x56ec3db7) // garbage
.D32(0xafbae234) // saved %edi
.D32(0x53d67131) // garbage
.D32(0x60f20ce6) // saved %ebx
.D32(0x40005510) // return address
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004003;
raw_context.ebx = 0x53d1379d; // saved %esi
raw_context.esi = 0xa97f229d; // callee's %esi
raw_context.edi = 0xb05cc997; // callee's %edi
CheckWalk();
}
// The results here should be the same as those at module offset
// 0x4003.
TEST_F(CFI, At4004) {
Label frame1_esp = expected.esp;
stack_section
.D32(0xe29782c2) // garbage
.D32(0xafbae234) // saved %edi
.D32(0x5ba29ce9) // garbage
.D32(0x60f20ce6) // saved %ebx
.D32(0x40005510) // return address
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004004;
raw_context.ebx = 0x53d1379d; // saved %esi
raw_context.esi = 0x0fb7dc4e; // callee's %esi
raw_context.edi = 0x993b4280; // callee's %edi
CheckWalk();
}
TEST_F(CFI, At4005) {
Label frame1_esp = expected.esp;
stack_section
.D32(0xe29782c2) // garbage
.D32(0xafbae234) // saved %edi
.D32(0x5ba29ce9) // garbage
.D32(0x60f20ce6) // saved %ebx
.D32(0x8036cc02) // garbage
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004005;
raw_context.ebx = 0x53d1379d; // saved %esi
raw_context.esi = 0x0fb7dc4e; // callee's %esi
raw_context.edi = 0x40005510; // return address
CheckWalk();
}
TEST_F(CFI, At4006) {
Label frame0_ebp;
Label frame1_esp = expected.esp;
stack_section
.D32(0xdcdd25cd) // garbage
.D32(0xafbae234) // saved %edi
.D32(0xc0d4aab9) // saved %ebp
.Mark(&frame0_ebp) // frame pointer points here
.D32(0x60f20ce6) // saved %ebx
.D32(0x8036cc02) // garbage
.Mark(&frame1_esp); // This effectively sets stack_section.start().
raw_context.eip = 0x40004006;
raw_context.ebp = frame0_ebp.Value();
raw_context.ebx = 0x53d1379d; // saved %esi
raw_context.esi = 0x743833c9; // callee's %esi
raw_context.edi = 0x40005510; // return address
CheckWalk();
}