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android_system_core/libunwindstack/tests/UnwinderTest.cpp
Christopher Ferris 2fcf4cf13e Add error propagation into Unwinder/Elf objects. 
The backtrace offline code uses these error codes to diagnose errors.
In addtion, I've had cases where seeing these errors would help diagnose
failures.

This also allows us to add a few features to indicate why an unwind
terminated (such as max frames exceeded).

Bug: 65682279

Test: Updated unit tests pass.
Change-Id: If82b5092698e8a194016d670efff1320f9b44d50
2018-01-24 17:50:46 -08:00

789 lines
28 KiB
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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <elf.h>
#include <stdint.h>
#include <sys/mman.h>
#include <memory>
#include <set>
#include <string>
#include <gtest/gtest.h>
#include <unwindstack/Elf.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Memory.h>
#include <unwindstack/Regs.h>
#include <unwindstack/RegsArm.h>
#include <unwindstack/RegsArm64.h>
#include <unwindstack/RegsX86.h>
#include <unwindstack/RegsX86_64.h>
#include <unwindstack/RegsMips.h>
#include <unwindstack/RegsMips64.h>
#include <unwindstack/Unwinder.h>
#include "ElfFake.h"
#include "MemoryFake.h"
#include "RegsFake.h"
namespace unwindstack {
class MapsFake : public Maps {
public:
MapsFake() = default;
virtual ~MapsFake() = default;
bool Parse() { return true; }
void FakeClear() { maps_.clear(); }
void FakeAddMapInfo(MapInfo* map_info) { maps_.push_back(map_info); }
};
class UnwinderTest : public ::testing::Test {
protected:
static void SetUpTestCase() {
maps_.FakeClear();
MapInfo* info = new MapInfo(0x1000, 0x8000, 0, PROT_READ | PROT_WRITE, "/system/fake/libc.so");
ElfFake* elf = new ElfFake(new MemoryFake);
info->elf = elf;
elf->FakeSetInterface(new ElfInterfaceFake(nullptr));
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x10000, 0x12000, 0, PROT_READ | PROT_WRITE, "[stack]");
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x13000, 0x15000, 0, PROT_READ | PROT_WRITE | MAPS_FLAGS_DEVICE_MAP,
"/dev/fake_device");
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x20000, 0x22000, 0, PROT_READ | PROT_WRITE, "/system/fake/libunwind.so");
elf = new ElfFake(new MemoryFake);
info->elf = elf;
elf->FakeSetInterface(new ElfInterfaceFake(nullptr));
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x23000, 0x24000, 0, PROT_READ | PROT_WRITE, "/fake/libanother.so");
elf = new ElfFake(new MemoryFake);
info->elf = elf;
elf->FakeSetInterface(new ElfInterfaceFake(nullptr));
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x33000, 0x34000, 0, PROT_READ | PROT_WRITE, "/fake/compressed.so");
elf = new ElfFake(new MemoryFake);
info->elf = elf;
elf->FakeSetInterface(new ElfInterfaceFake(nullptr));
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x43000, 0x44000, 0x1d000, PROT_READ | PROT_WRITE, "/fake/fake.apk");
elf = new ElfFake(new MemoryFake);
info->elf = elf;
elf->FakeSetInterface(new ElfInterfaceFake(nullptr));
maps_.FakeAddMapInfo(info);
info = new MapInfo(0x53000, 0x54000, 0, PROT_READ | PROT_WRITE, "/fake/fake.oat");
maps_.FakeAddMapInfo(info);
process_memory_.reset(new MemoryFake);
}
void SetUp() override {
ElfInterfaceFake::FakeClear();
regs_.FakeSetArch(ARCH_ARM);
regs_.FakeSetReturnAddressValid(false);
}
static MapsFake maps_;
static RegsFake regs_;
static std::shared_ptr<Memory> process_memory_;
};
MapsFake UnwinderTest::maps_;
RegsFake UnwinderTest::regs_(5, 0);
std::shared_ptr<Memory> UnwinderTest::process_memory_(nullptr);
TEST_F(UnwinderTest, multiple_frames) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0x1102, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x1202, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(3U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x1000U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[1];
EXPECT_EQ(1U, frame->num);
EXPECT_EQ(0x100U, frame->rel_pc);
EXPECT_EQ(0x1100U, frame->pc);
EXPECT_EQ(0x10010U, frame->sp);
EXPECT_EQ("Frame1", frame->function_name);
EXPECT_EQ(1U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[2];
EXPECT_EQ(2U, frame->num);
EXPECT_EQ(0x200U, frame->rel_pc);
EXPECT_EQ(0x1200U, frame->pc);
EXPECT_EQ(0x10020U, frame->sp);
EXPECT_EQ("Frame2", frame->function_name);
EXPECT_EQ(2U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
TEST_F(UnwinderTest, non_zero_map_offset) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
regs_.FakeSetPc(0x43000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(1U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x43000U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/fake/fake.apk", frame->map_name);
EXPECT_EQ(0x1d000U, frame->map_offset);
EXPECT_EQ(0x43000U, frame->map_start);
EXPECT_EQ(0x44000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify that no attempt to continue after the step indicates it is done.
TEST_F(UnwinderTest, no_frames_after_finished) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame3", 3));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame4", 4));
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0x1000, 0x10000, true));
ElfInterfaceFake::FakePushStepData(StepData(0x1102, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x1202, 0x10020, false));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(1U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x1000U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify the maximum frames to save.
TEST_F(UnwinderTest, max_frames) {
for (size_t i = 0; i < 30; i++) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame" + std::to_string(i), i));
ElfInterfaceFake::FakePushStepData(StepData(0x1102 + i * 0x100, 0x10010 + i * 0x10, false));
}
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x10000);
Unwinder unwinder(20, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_MAX_FRAMES_EXCEEDED, unwinder.LastErrorCode());
ASSERT_EQ(20U, unwinder.NumFrames());
for (size_t i = 0; i < 20; i++) {
auto* frame = &unwinder.frames()[i];
EXPECT_EQ(i, frame->num);
EXPECT_EQ(i * 0x100, frame->rel_pc) << "Failed at frame " << i;
EXPECT_EQ(0x1000 + i * 0x100, frame->pc) << "Failed at frame " << i;
EXPECT_EQ(0x10000 + 0x10 * i, frame->sp) << "Failed at frame " << i;
EXPECT_EQ("Frame" + std::to_string(i), frame->function_name) << "Failed at frame " << i;
EXPECT_EQ(i, frame->function_offset) << "Failed at frame " << i;
EXPECT_EQ("/system/fake/libc.so", frame->map_name) << "Failed at frame " << i;
EXPECT_EQ(0U, frame->map_offset) << "Failed at frame " << i;
EXPECT_EQ(0x1000U, frame->map_start) << "Failed at frame " << i;
EXPECT_EQ(0x8000U, frame->map_end) << "Failed at frame " << i;
EXPECT_EQ(0U, frame->map_load_bias) << "Failed at frame " << i;
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags) << "Failed at frame " << i;
}
}
// Verify that initial map names frames are removed.
TEST_F(UnwinderTest, verify_frames_skipped) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
regs_.FakeSetPc(0x20000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0x23002, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x23102, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0x20002, 0x10030, false));
ElfInterfaceFake::FakePushStepData(StepData(0x21002, 0x10040, false));
ElfInterfaceFake::FakePushStepData(StepData(0x1002, 0x10050, false));
ElfInterfaceFake::FakePushStepData(StepData(0x21002, 0x10060, false));
ElfInterfaceFake::FakePushStepData(StepData(0x23002, 0x10070, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
std::vector<std::string> skip_libs{"libunwind.so", "libanother.so"};
unwinder.Unwind(&skip_libs);
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(3U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x1000U, frame->pc);
EXPECT_EQ(0x10050U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[1];
EXPECT_EQ(1U, frame->num);
EXPECT_EQ(0x1000U, frame->rel_pc);
EXPECT_EQ(0x21000U, frame->pc);
EXPECT_EQ(0x10060U, frame->sp);
EXPECT_EQ("Frame1", frame->function_name);
EXPECT_EQ(1U, frame->function_offset);
EXPECT_EQ("/system/fake/libunwind.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x20000U, frame->map_start);
EXPECT_EQ(0x22000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[2];
EXPECT_EQ(2U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x23000U, frame->pc);
EXPECT_EQ(0x10070U, frame->sp);
EXPECT_EQ("Frame2", frame->function_name);
EXPECT_EQ(2U, frame->function_offset);
EXPECT_EQ("/fake/libanother.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x23000U, frame->map_start);
EXPECT_EQ(0x24000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify SP in a non-existant map is okay.
TEST_F(UnwinderTest, sp_not_in_map) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x63000);
ElfInterfaceFake::FakePushStepData(StepData(0x21002, 0x50020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(2U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x1000U, frame->pc);
EXPECT_EQ(0x63000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[1];
EXPECT_EQ(1U, frame->num);
EXPECT_EQ(0x1000U, frame->rel_pc);
EXPECT_EQ(0x21000U, frame->pc);
EXPECT_EQ(0x50020U, frame->sp);
EXPECT_EQ("Frame1", frame->function_name);
EXPECT_EQ(1U, frame->function_offset);
EXPECT_EQ("/system/fake/libunwind.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x20000U, frame->map_start);
EXPECT_EQ(0x22000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify PC in a device stops the unwind.
TEST_F(UnwinderTest, pc_in_device_stops_unwind) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
regs_.FakeSetPc(0x13000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0x23002, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x23102, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(1U, unwinder.NumFrames());
}
// Verify SP in a device stops the unwind.
TEST_F(UnwinderTest, sp_in_device_stops_unwind) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x13000);
ElfInterfaceFake::FakePushStepData(StepData(0x23002, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x23102, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(1U, unwinder.NumFrames());
}
// Verify a no map info frame gets a frame.
TEST_F(UnwinderTest, pc_without_map) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
regs_.FakeSetPc(0x41000);
regs_.FakeSetSp(0x13000);
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_INVALID_MAP, unwinder.LastErrorCode());
ASSERT_EQ(1U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0x41000U, frame->rel_pc);
EXPECT_EQ(0x41000U, frame->pc);
EXPECT_EQ(0x13000U, frame->sp);
EXPECT_EQ("", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0U, frame->map_start);
EXPECT_EQ(0U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(0, frame->map_flags);
}
// Verify that a speculative frame is added.
TEST_F(UnwinderTest, speculative_frame) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
// Fake as if code called a nullptr function.
regs_.FakeSetPc(0);
regs_.FakeSetSp(0x10000);
regs_.FakeSetReturnAddress(0x1202);
regs_.FakeSetReturnAddressValid(true);
ElfInterfaceFake::FakePushStepData(StepData(0x23102, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(3U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0U, frame->map_start);
EXPECT_EQ(0U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(0, frame->map_flags);
frame = &unwinder.frames()[1];
EXPECT_EQ(1U, frame->num);
EXPECT_EQ(0x200U, frame->rel_pc);
EXPECT_EQ(0x1200U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[2];
EXPECT_EQ(2U, frame->num);
EXPECT_EQ(0x100U, frame->rel_pc);
EXPECT_EQ(0x23100U, frame->pc);
EXPECT_EQ(0x10020U, frame->sp);
EXPECT_EQ("Frame1", frame->function_name);
EXPECT_EQ(1U, frame->function_offset);
EXPECT_EQ("/fake/libanother.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x23000U, frame->map_start);
EXPECT_EQ(0x24000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify that a speculative frame is added then removed because no other
// frames are added.
TEST_F(UnwinderTest, speculative_frame_removed) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
// Fake as if code called a nullptr function.
regs_.FakeSetPc(0);
regs_.FakeSetSp(0x10000);
regs_.FakeSetReturnAddress(0x1202);
regs_.FakeSetReturnAddressValid(true);
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(1U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0U, frame->map_start);
EXPECT_EQ(0U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(0, frame->map_flags);
}
// Verify that an unwind stops when a frame is in given suffix.
TEST_F(UnwinderTest, map_ignore_suffixes) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame3", 3));
// Fake as if code called a nullptr function.
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0x43402, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x53502, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
std::vector<std::string> suffixes{"oat"};
unwinder.Unwind(nullptr, &suffixes);
EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
ASSERT_EQ(2U, unwinder.NumFrames());
// Make sure the elf was not initialized.
MapInfo* map_info = maps_.Find(0x53000);
ASSERT_TRUE(map_info != nullptr);
EXPECT_TRUE(map_info->elf == nullptr);
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x1000U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[1];
EXPECT_EQ(1U, frame->num);
EXPECT_EQ(0x400U, frame->rel_pc);
EXPECT_EQ(0x43400U, frame->pc);
EXPECT_EQ(0x10010U, frame->sp);
EXPECT_EQ("Frame1", frame->function_name);
EXPECT_EQ(1U, frame->function_offset);
EXPECT_EQ("/fake/fake.apk", frame->map_name);
EXPECT_EQ(0x1d000U, frame->map_offset);
EXPECT_EQ(0x43000U, frame->map_start);
EXPECT_EQ(0x44000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify that an unwind stops when the sp and pc don't change.
TEST_F(UnwinderTest, sp_pc_do_not_change) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame3", 3));
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame4", 4));
regs_.FakeSetPc(0x1000);
regs_.FakeSetSp(0x10000);
ElfInterfaceFake::FakePushStepData(StepData(0x33402, 0x10010, false));
ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
Unwinder unwinder(64, &maps_, &regs_, process_memory_);
unwinder.Unwind();
EXPECT_EQ(ERROR_REPEATED_FRAME, unwinder.LastErrorCode());
ASSERT_EQ(3U, unwinder.NumFrames());
auto* frame = &unwinder.frames()[0];
EXPECT_EQ(0U, frame->num);
EXPECT_EQ(0U, frame->rel_pc);
EXPECT_EQ(0x1000U, frame->pc);
EXPECT_EQ(0x10000U, frame->sp);
EXPECT_EQ("Frame0", frame->function_name);
EXPECT_EQ(0U, frame->function_offset);
EXPECT_EQ("/system/fake/libc.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x1000U, frame->map_start);
EXPECT_EQ(0x8000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[1];
EXPECT_EQ(1U, frame->num);
EXPECT_EQ(0x400U, frame->rel_pc);
EXPECT_EQ(0x33400U, frame->pc);
EXPECT_EQ(0x10010U, frame->sp);
EXPECT_EQ("Frame1", frame->function_name);
EXPECT_EQ(1U, frame->function_offset);
EXPECT_EQ("/fake/compressed.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x33000U, frame->map_start);
EXPECT_EQ(0x34000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
frame = &unwinder.frames()[2];
EXPECT_EQ(2U, frame->num);
EXPECT_EQ(0x500U, frame->rel_pc);
EXPECT_EQ(0x33500U, frame->pc);
EXPECT_EQ(0x10020U, frame->sp);
EXPECT_EQ("Frame2", frame->function_name);
EXPECT_EQ(2U, frame->function_offset);
EXPECT_EQ("/fake/compressed.so", frame->map_name);
EXPECT_EQ(0U, frame->map_offset);
EXPECT_EQ(0x33000U, frame->map_start);
EXPECT_EQ(0x34000U, frame->map_end);
EXPECT_EQ(0U, frame->map_load_bias);
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
// Verify format frame code.
TEST_F(UnwinderTest, format_frame_static) {
FrameData frame;
frame.num = 1;
frame.rel_pc = 0x1000;
frame.pc = 0x4000;
frame.sp = 0x1000;
frame.function_name = "function";
frame.function_offset = 100;
frame.map_name = "/fake/libfake.so";
frame.map_offset = 0x2000;
frame.map_start = 0x3000;
frame.map_end = 0x6000;
frame.map_flags = PROT_READ;
EXPECT_EQ(" #01 pc 0000000000001000 (offset 0x2000) /fake/libfake.so (function+100)",
Unwinder::FormatFrame(frame, false));
EXPECT_EQ(" #01 pc 00001000 (offset 0x2000) /fake/libfake.so (function+100)",
Unwinder::FormatFrame(frame, true));
frame.map_offset = 0;
EXPECT_EQ(" #01 pc 0000000000001000 /fake/libfake.so (function+100)",
Unwinder::FormatFrame(frame, false));
EXPECT_EQ(" #01 pc 00001000 /fake/libfake.so (function+100)",
Unwinder::FormatFrame(frame, true));
frame.function_offset = 0;
EXPECT_EQ(" #01 pc 0000000000001000 /fake/libfake.so (function)",
Unwinder::FormatFrame(frame, false));
EXPECT_EQ(" #01 pc 00001000 /fake/libfake.so (function)", Unwinder::FormatFrame(frame, true));
frame.function_name = "";
EXPECT_EQ(" #01 pc 0000000000001000 /fake/libfake.so", Unwinder::FormatFrame(frame, false));
EXPECT_EQ(" #01 pc 00001000 /fake/libfake.so", Unwinder::FormatFrame(frame, true));
frame.map_name = "";
EXPECT_EQ(" #01 pc 0000000000001000 <anonymous:3000>", Unwinder::FormatFrame(frame, false));
EXPECT_EQ(" #01 pc 00001000 <anonymous:3000>", Unwinder::FormatFrame(frame, true));
frame.map_start = 0;
frame.map_end = 0;
EXPECT_EQ(" #01 pc 0000000000001000 <unknown>", Unwinder::FormatFrame(frame, false));
EXPECT_EQ(" #01 pc 00001000 <unknown>", Unwinder::FormatFrame(frame, true));
}
static std::string ArchToString(ArchEnum arch) {
if (arch == ARCH_ARM) {
return "Arm";
} else if (arch == ARCH_ARM64) {
return "Arm64";
} else if (arch == ARCH_X86) {
return "X86";
} else if (arch == ARCH_X86_64) {
return "X86_64";
} else {
return "Unknown";
}
}
// Verify format frame code.
TEST_F(UnwinderTest, format_frame) {
std::vector<Regs*> reg_list;
RegsArm* arm = new RegsArm;
arm->set_pc(0x2300);
arm->set_sp(0x10000);
reg_list.push_back(arm);
RegsArm64* arm64 = new RegsArm64;
arm64->set_pc(0x2300);
arm64->set_sp(0x10000);
reg_list.push_back(arm64);
RegsX86* x86 = new RegsX86;
x86->set_pc(0x2300);
x86->set_sp(0x10000);
reg_list.push_back(x86);
RegsX86_64* x86_64 = new RegsX86_64;
x86_64->set_pc(0x2300);
x86_64->set_sp(0x10000);
reg_list.push_back(x86_64);
RegsMips* mips = new RegsMips;
mips->set_pc(0x2300);
mips->set_sp(0x10000);
reg_list.push_back(mips);
RegsMips64* mips64 = new RegsMips64;
mips64->set_pc(0x2300);
mips64->set_sp(0x10000);
reg_list.push_back(mips64);
for (auto regs : reg_list) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 10));
Unwinder unwinder(64, &maps_, regs, process_memory_);
unwinder.Unwind();
ASSERT_EQ(1U, unwinder.NumFrames());
std::string expected;
switch (regs->Arch()) {
case ARCH_ARM:
case ARCH_X86:
case ARCH_MIPS:
expected = " #00 pc 00001300 /system/fake/libc.so (Frame0+10)";
break;
case ARCH_ARM64:
case ARCH_X86_64:
case ARCH_MIPS64:
expected = " #00 pc 0000000000001300 /system/fake/libc.so (Frame0+10)";
break;
default:
expected = "";
}
EXPECT_EQ(expected, unwinder.FormatFrame(0))
<< "Mismatch of frame format for regs arch " << ArchToString(regs->Arch());
delete regs;
}
}
} // namespace unwindstack
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