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platform_system_core/libunwindstack/tests/RegsTest.cpp
Christopher Ferris b9de87f7ed Add a new unwind method on error. 
If a function crashes by jumping into unexecutable code, the old method
could not unwind through that. Add a fallback method to set the pc from
the default return address location.

In addition, add a new finished check for steps. This will provide a method
to indicate that this step is the last step. This prevents cases where
the fallback method might be triggered incorrectly.

Update the libbacktrace code to unwind using the new methodology.

Update the unwind tool to use the new unwind methodology.

Add a new option to crasher that calls through a null function.

Create a new object, Unwinder, that encapsulates the a basic unwind. For now,
libbacktrace will still use the custom code.

Added new unit tests to cover the new cases. Also add a test that
crashes calling a nullptr as a function, and then has call frames in
the signal stack.

Bug: 65842173

Test: Pass all unit tests, verify crasher dumps properly.
Change-Id: Ia18430ab107e9f7bdf0e14a9b74710b1280bd7f4
2017-09-22 16:55:12 -07:00

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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 <stdint.h>
#include <gtest/gtest.h>
#include <unwindstack/Elf.h>
#include <unwindstack/ElfInterface.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Regs.h>
#include "MemoryFake.h"
namespace unwindstack {
class ElfFake : public Elf {
public:
ElfFake(Memory* memory) : Elf(memory) { valid_ = true; }
virtual ~ElfFake() = default;
void set_elf_interface(ElfInterface* interface) { interface_.reset(interface); }
};
class ElfInterfaceFake : public ElfInterface {
public:
ElfInterfaceFake(Memory* memory) : ElfInterface(memory) {}
virtual ~ElfInterfaceFake() = default;
void set_load_bias(uint64_t load_bias) { load_bias_ = load_bias; }
bool Init() override { return false; }
void InitHeaders() override {}
bool GetSoname(std::string*) override { return false; }
bool GetFunctionName(uint64_t, std::string*, uint64_t*) override { return false; }
bool Step(uint64_t, Regs*, Memory*, bool*) override { return false; }
};
template <typename TypeParam>
class RegsTestImpl : public RegsImpl<TypeParam> {
public:
RegsTestImpl(uint16_t total_regs, uint16_t regs_sp)
: RegsImpl<TypeParam>(total_regs, regs_sp, Regs::Location(Regs::LOCATION_UNKNOWN, 0)) {}
RegsTestImpl(uint16_t total_regs, uint16_t regs_sp, Regs::Location return_loc)
: RegsImpl<TypeParam>(total_regs, regs_sp, return_loc) {}
virtual ~RegsTestImpl() = default;
uint32_t MachineType() override { return 0; }
uint64_t GetAdjustedPc(uint64_t, Elf*) override { return 0; }
void SetFromRaw() override {}
bool SetPcFromReturnAddress(Memory*) override { return false; }
bool StepIfSignalHandler(uint64_t, Elf*, Memory*) override { return false; }
};
class RegsTest : public ::testing::Test {
protected:
void SetUp() override {
memory_ = new MemoryFake;
elf_.reset(new ElfFake(memory_));
elf_interface_ = new ElfInterfaceFake(elf_->memory());
elf_->set_elf_interface(elf_interface_);
}
template <typename AddressType>
void RegsReturnAddressRegister();
ElfInterfaceFake* elf_interface_;
MemoryFake* memory_;
std::unique_ptr<ElfFake> elf_;
};
TEST_F(RegsTest, regs32) {
RegsTestImpl<uint32_t> regs32(50, 10);
ASSERT_EQ(50U, regs32.total_regs());
ASSERT_EQ(10U, regs32.sp_reg());
uint32_t* raw = reinterpret_cast<uint32_t*>(regs32.RawData());
for (size_t i = 0; i < 50; i++) {
raw[i] = 0xf0000000 + i;
}
regs32.set_pc(0xf0120340);
regs32.set_sp(0xa0ab0cd0);
for (size_t i = 0; i < 50; i++) {
ASSERT_EQ(0xf0000000U + i, regs32[i]) << "Failed comparing register " << i;
}
ASSERT_EQ(0xf0120340U, regs32.pc());
ASSERT_EQ(0xa0ab0cd0U, regs32.sp());
regs32[32] = 10;
ASSERT_EQ(10U, regs32[32]);
}
TEST_F(RegsTest, regs64) {
RegsTestImpl<uint64_t> regs64(30, 12);
ASSERT_EQ(30U, regs64.total_regs());
ASSERT_EQ(12U, regs64.sp_reg());
uint64_t* raw = reinterpret_cast<uint64_t*>(regs64.RawData());
for (size_t i = 0; i < 30; i++) {
raw[i] = 0xf123456780000000UL + i;
}
regs64.set_pc(0xf123456780102030UL);
regs64.set_sp(0xa123456780a0b0c0UL);
for (size_t i = 0; i < 30; i++) {
ASSERT_EQ(0xf123456780000000U + i, regs64[i]) << "Failed reading register " << i;
}
ASSERT_EQ(0xf123456780102030UL, regs64.pc());
ASSERT_EQ(0xa123456780a0b0c0UL, regs64.sp());
regs64[8] = 10;
ASSERT_EQ(10U, regs64[8]);
}
template <typename AddressType>
void RegsTest::RegsReturnAddressRegister() {
RegsTestImpl<AddressType> regs(20, 10, Regs::Location(Regs::LOCATION_REGISTER, 5));
regs[5] = 0x12345;
uint64_t value;
ASSERT_TRUE(regs.GetReturnAddressFromDefault(memory_, &value));
ASSERT_EQ(0x12345U, value);
}
TEST_F(RegsTest, regs32_return_address_register) {
RegsReturnAddressRegister<uint32_t>();
}
TEST_F(RegsTest, regs64_return_address_register) {
RegsReturnAddressRegister<uint64_t>();
}
TEST_F(RegsTest, regs32_return_address_sp_offset) {
RegsTestImpl<uint32_t> regs(20, 10, Regs::Location(Regs::LOCATION_SP_OFFSET, -2));
regs.set_sp(0x2002);
memory_->SetData32(0x2000, 0x12345678);
uint64_t value;
ASSERT_TRUE(regs.GetReturnAddressFromDefault(memory_, &value));
ASSERT_EQ(0x12345678U, value);
}
TEST_F(RegsTest, regs64_return_address_sp_offset) {
RegsTestImpl<uint64_t> regs(20, 10, Regs::Location(Regs::LOCATION_SP_OFFSET, -8));
regs.set_sp(0x2008);
memory_->SetData64(0x2000, 0x12345678aabbccddULL);
uint64_t value;
ASSERT_TRUE(regs.GetReturnAddressFromDefault(memory_, &value));
ASSERT_EQ(0x12345678aabbccddULL, value);
}
TEST_F(RegsTest, rel_pc) {
RegsArm64 arm64;
ASSERT_EQ(0xcU, arm64.GetAdjustedPc(0x10, elf_.get()));
ASSERT_EQ(0x0U, arm64.GetAdjustedPc(0x4, elf_.get()));
ASSERT_EQ(0x3U, arm64.GetAdjustedPc(0x3, elf_.get()));
ASSERT_EQ(0x2U, arm64.GetAdjustedPc(0x2, elf_.get()));
ASSERT_EQ(0x1U, arm64.GetAdjustedPc(0x1, elf_.get()));
ASSERT_EQ(0x0U, arm64.GetAdjustedPc(0x0, elf_.get()));
RegsX86 x86;
ASSERT_EQ(0xffU, x86.GetAdjustedPc(0x100, elf_.get()));
ASSERT_EQ(0x1U, x86.GetAdjustedPc(0x2, elf_.get()));
ASSERT_EQ(0x0U, x86.GetAdjustedPc(0x1, elf_.get()));
ASSERT_EQ(0x0U, x86.GetAdjustedPc(0x0, elf_.get()));
RegsX86_64 x86_64;
ASSERT_EQ(0xffU, x86_64.GetAdjustedPc(0x100, elf_.get()));
ASSERT_EQ(0x1U, x86_64.GetAdjustedPc(0x2, elf_.get()));
ASSERT_EQ(0x0U, x86_64.GetAdjustedPc(0x1, elf_.get()));
ASSERT_EQ(0x0U, x86_64.GetAdjustedPc(0x0, elf_.get()));
}
TEST_F(RegsTest, rel_pc_arm) {
RegsArm arm;
// Check fence posts.
elf_interface_->set_load_bias(0);
ASSERT_EQ(3U, arm.GetAdjustedPc(0x5, elf_.get()));
ASSERT_EQ(4U, arm.GetAdjustedPc(0x4, elf_.get()));
ASSERT_EQ(3U, arm.GetAdjustedPc(0x3, elf_.get()));
ASSERT_EQ(2U, arm.GetAdjustedPc(0x2, elf_.get()));
ASSERT_EQ(1U, arm.GetAdjustedPc(0x1, elf_.get()));
ASSERT_EQ(0U, arm.GetAdjustedPc(0x0, elf_.get()));
elf_interface_->set_load_bias(0x100);
ASSERT_EQ(0xffU, arm.GetAdjustedPc(0xff, elf_.get()));
ASSERT_EQ(0x103U, arm.GetAdjustedPc(0x105, elf_.get()));
ASSERT_EQ(0x104U, arm.GetAdjustedPc(0x104, elf_.get()));
ASSERT_EQ(0x103U, arm.GetAdjustedPc(0x103, elf_.get()));
ASSERT_EQ(0x102U, arm.GetAdjustedPc(0x102, elf_.get()));
ASSERT_EQ(0x101U, arm.GetAdjustedPc(0x101, elf_.get()));
ASSERT_EQ(0x100U, arm.GetAdjustedPc(0x100, elf_.get()));
// Check thumb instructions handling.
elf_interface_->set_load_bias(0);
memory_->SetData32(0x2000, 0);
ASSERT_EQ(0x2003U, arm.GetAdjustedPc(0x2005, elf_.get()));
memory_->SetData32(0x2000, 0xe000f000);
ASSERT_EQ(0x2001U, arm.GetAdjustedPc(0x2005, elf_.get()));
elf_interface_->set_load_bias(0x400);
memory_->SetData32(0x2100, 0);
ASSERT_EQ(0x2503U, arm.GetAdjustedPc(0x2505, elf_.get()));
memory_->SetData32(0x2100, 0xf111f111);
ASSERT_EQ(0x2501U, arm.GetAdjustedPc(0x2505, elf_.get()));
}
TEST_F(RegsTest, elf_invalid) {
Elf invalid_elf(new MemoryFake);
RegsArm regs_arm;
RegsArm64 regs_arm64;
RegsX86 regs_x86;
RegsX86_64 regs_x86_64;
MapInfo map_info{.start = 0x1000, .end = 0x2000};
regs_arm.set_pc(0x1500);
ASSERT_EQ(0x500U, invalid_elf.GetRelPc(regs_arm.pc(), &map_info));
ASSERT_EQ(0x500U, regs_arm.GetAdjustedPc(0x500U, &invalid_elf));
regs_arm64.set_pc(0x1600);
ASSERT_EQ(0x600U, invalid_elf.GetRelPc(regs_arm64.pc(), &map_info));
ASSERT_EQ(0x600U, regs_arm64.GetAdjustedPc(0x600U, &invalid_elf));
regs_x86.set_pc(0x1700);
ASSERT_EQ(0x700U, invalid_elf.GetRelPc(regs_x86.pc(), &map_info));
ASSERT_EQ(0x700U, regs_x86.GetAdjustedPc(0x700U, &invalid_elf));
regs_x86_64.set_pc(0x1800);
ASSERT_EQ(0x800U, invalid_elf.GetRelPc(regs_x86_64.pc(), &map_info));
ASSERT_EQ(0x800U, regs_x86_64.GetAdjustedPc(0x800U, &invalid_elf));
}
TEST_F(RegsTest, arm_set_from_raw) {
RegsArm arm;
uint32_t* regs = reinterpret_cast<uint32_t*>(arm.RawData());
regs[13] = 0x100;
regs[15] = 0x200;
arm.SetFromRaw();
EXPECT_EQ(0x100U, arm.sp());
EXPECT_EQ(0x200U, arm.pc());
}
TEST_F(RegsTest, arm64_set_from_raw) {
RegsArm64 arm64;
uint64_t* regs = reinterpret_cast<uint64_t*>(arm64.RawData());
regs[31] = 0xb100000000ULL;
regs[32] = 0xc200000000ULL;
arm64.SetFromRaw();
EXPECT_EQ(0xb100000000U, arm64.sp());
EXPECT_EQ(0xc200000000U, arm64.pc());
}
TEST_F(RegsTest, x86_set_from_raw) {
RegsX86 x86;
uint32_t* regs = reinterpret_cast<uint32_t*>(x86.RawData());
regs[4] = 0x23450000;
regs[8] = 0xabcd0000;
x86.SetFromRaw();
EXPECT_EQ(0x23450000U, x86.sp());
EXPECT_EQ(0xabcd0000U, x86.pc());
}
TEST_F(RegsTest, x86_64_set_from_raw) {
RegsX86_64 x86_64;
uint64_t* regs = reinterpret_cast<uint64_t*>(x86_64.RawData());
regs[7] = 0x1200000000ULL;
regs[16] = 0x4900000000ULL;
x86_64.SetFromRaw();
EXPECT_EQ(0x1200000000U, x86_64.sp());
EXPECT_EQ(0x4900000000U, x86_64.pc());
}
} // namespace unwindstack
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