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platform_system_core/libunwindstack/tests/RegsTest.cpp
Christopher Ferris 9d5712c123 Implement support for linker rosegment option. 
The rosegment linker option results in two maps containing the elf data
existing. One is an execute map where the code lives, and the other is the
read-only segment which contains the elf header information. If the file
backing a shared library in memory is not readable, then the new code
will attempt to find the read-only map that has the same name as the
current execute segment, and that is at offest zero in the file.

Add new unit tests for this functionality.

Add the missing MapInfoCreateMemoryTest.cpp to the list of tests.

Bug: 109657296

Test: Pass new unit tests.
Test: All unit libbacktrace/libunwindstack tests pass with rosegment enabled.
Change-Id: If8f69e4a067d77b3f2a7c31e2e5cd989a0702a8c
2018-10-03 20:48:45 -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/RegsArm.h>
#include <unwindstack/RegsArm64.h>
#include <unwindstack/RegsX86.h>
#include <unwindstack/RegsX86_64.h>
#include <unwindstack/RegsMips.h>
#include <unwindstack/RegsMips64.h>
#include "ElfFake.h"
#include "MemoryFake.h"
#include "RegsFake.h"
namespace unwindstack {
class RegsTest : public ::testing::Test {
protected:
void SetUp() override {
memory_ = new MemoryFake;
elf_.reset(new ElfFake(memory_));
elf_interface_ = new ElfInterfaceFake(elf_->memory());
elf_->FakeSetInterface(elf_interface_);
}
ElfInterfaceFake* elf_interface_;
MemoryFake* memory_;
std::unique_ptr<ElfFake> elf_;
};
TEST_F(RegsTest, regs32) {
RegsImplFake<uint32_t> regs32(50);
ASSERT_EQ(50U, regs32.total_regs());
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) {
RegsImplFake<uint64_t> regs64(30);
ASSERT_EQ(30U, regs64.total_regs());
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]);
}
TEST_F(RegsTest, rel_pc) {
RegsArm64 arm64;
EXPECT_EQ(4U, arm64.GetPcAdjustment(0x10, elf_.get()));
EXPECT_EQ(4U, arm64.GetPcAdjustment(0x4, elf_.get()));
EXPECT_EQ(0U, arm64.GetPcAdjustment(0x3, elf_.get()));
EXPECT_EQ(0U, arm64.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(0U, arm64.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(0U, arm64.GetPcAdjustment(0x0, elf_.get()));
RegsX86 x86;
EXPECT_EQ(1U, x86.GetPcAdjustment(0x100, elf_.get()));
EXPECT_EQ(1U, x86.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(1U, x86.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(0U, x86.GetPcAdjustment(0x0, elf_.get()));
RegsX86_64 x86_64;
EXPECT_EQ(1U, x86_64.GetPcAdjustment(0x100, elf_.get()));
EXPECT_EQ(1U, x86_64.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(1U, x86_64.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(0U, x86_64.GetPcAdjustment(0x0, elf_.get()));
RegsMips mips;
EXPECT_EQ(8U, mips.GetPcAdjustment(0x10, elf_.get()));
EXPECT_EQ(8U, mips.GetPcAdjustment(0x8, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x7, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x6, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x5, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x4, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x3, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(0U, mips.GetPcAdjustment(0x0, elf_.get()));
RegsMips64 mips64;
EXPECT_EQ(8U, mips64.GetPcAdjustment(0x10, elf_.get()));
EXPECT_EQ(8U, mips64.GetPcAdjustment(0x8, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x7, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x6, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x5, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x4, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x3, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(0U, mips64.GetPcAdjustment(0x0, elf_.get()));
}
TEST_F(RegsTest, rel_pc_arm) {
RegsArm arm;
// Check fence posts.
elf_->FakeSetLoadBias(0);
EXPECT_EQ(2U, arm.GetPcAdjustment(0x5, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x4, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x3, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(0U, arm.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(0U, arm.GetPcAdjustment(0x0, elf_.get()));
elf_->FakeSetLoadBias(0x100);
EXPECT_EQ(0U, arm.GetPcAdjustment(0x1, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x2, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0xff, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x105, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x104, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x103, elf_.get()));
EXPECT_EQ(2U, arm.GetPcAdjustment(0x102, elf_.get()));
EXPECT_EQ(0U, arm.GetPcAdjustment(0x101, elf_.get()));
EXPECT_EQ(0U, arm.GetPcAdjustment(0x100, elf_.get()));
// Check thumb instructions handling.
elf_->FakeSetLoadBias(0);
memory_->SetData32(0x2000, 0);
EXPECT_EQ(2U, arm.GetPcAdjustment(0x2005, elf_.get()));
memory_->SetData32(0x2000, 0xe000f000);
EXPECT_EQ(4U, arm.GetPcAdjustment(0x2005, elf_.get()));
elf_->FakeSetLoadBias(0x400);
memory_->SetData32(0x2100, 0);
EXPECT_EQ(2U, arm.GetPcAdjustment(0x2505, elf_.get()));
memory_->SetData32(0x2100, 0xf111f111);
EXPECT_EQ(4U, arm.GetPcAdjustment(0x2505, elf_.get()));
}
TEST_F(RegsTest, elf_invalid) {
RegsArm regs_arm;
RegsArm64 regs_arm64;
RegsX86 regs_x86;
RegsX86_64 regs_x86_64;
RegsMips regs_mips;
RegsMips64 regs_mips64;
MapInfo map_info(nullptr, 0x1000, 0x2000);
Elf* invalid_elf = new Elf(nullptr);
map_info.elf.reset(invalid_elf);
regs_arm.set_pc(0x1500);
EXPECT_EQ(0x500U, invalid_elf->GetRelPc(regs_arm.pc(), &map_info));
EXPECT_EQ(2U, regs_arm.GetPcAdjustment(0x500U, invalid_elf));
EXPECT_EQ(2U, regs_arm.GetPcAdjustment(0x511U, invalid_elf));
regs_arm64.set_pc(0x1600);
EXPECT_EQ(0x600U, invalid_elf->GetRelPc(regs_arm64.pc(), &map_info));
EXPECT_EQ(4U, regs_arm64.GetPcAdjustment(0x600U, invalid_elf));
regs_x86.set_pc(0x1700);
EXPECT_EQ(0x700U, invalid_elf->GetRelPc(regs_x86.pc(), &map_info));
EXPECT_EQ(1U, regs_x86.GetPcAdjustment(0x700U, invalid_elf));
regs_x86_64.set_pc(0x1800);
EXPECT_EQ(0x800U, invalid_elf->GetRelPc(regs_x86_64.pc(), &map_info));
EXPECT_EQ(1U, regs_x86_64.GetPcAdjustment(0x800U, invalid_elf));
regs_mips.set_pc(0x1900);
EXPECT_EQ(0x900U, invalid_elf->GetRelPc(regs_mips.pc(), &map_info));
EXPECT_EQ(8U, regs_mips.GetPcAdjustment(0x900U, invalid_elf));
regs_mips64.set_pc(0x1a00);
EXPECT_EQ(0xa00U, invalid_elf->GetRelPc(regs_mips64.pc(), &map_info));
EXPECT_EQ(8U, regs_mips64.GetPcAdjustment(0xa00U, invalid_elf));
}
TEST_F(RegsTest, arm_verify_sp_pc) {
RegsArm arm;
uint32_t* regs = reinterpret_cast<uint32_t*>(arm.RawData());
regs[13] = 0x100;
regs[15] = 0x200;
EXPECT_EQ(0x100U, arm.sp());
EXPECT_EQ(0x200U, arm.pc());
}
TEST_F(RegsTest, arm64_verify_sp_pc) {
RegsArm64 arm64;
uint64_t* regs = reinterpret_cast<uint64_t*>(arm64.RawData());
regs[31] = 0xb100000000ULL;
regs[32] = 0xc200000000ULL;
EXPECT_EQ(0xb100000000U, arm64.sp());
EXPECT_EQ(0xc200000000U, arm64.pc());
}
TEST_F(RegsTest, x86_verify_sp_pc) {
RegsX86 x86;
uint32_t* regs = reinterpret_cast<uint32_t*>(x86.RawData());
regs[4] = 0x23450000;
regs[8] = 0xabcd0000;
EXPECT_EQ(0x23450000U, x86.sp());
EXPECT_EQ(0xabcd0000U, x86.pc());
}
TEST_F(RegsTest, x86_64_verify_sp_pc) {
RegsX86_64 x86_64;
uint64_t* regs = reinterpret_cast<uint64_t*>(x86_64.RawData());
regs[7] = 0x1200000000ULL;
regs[16] = 0x4900000000ULL;
EXPECT_EQ(0x1200000000U, x86_64.sp());
EXPECT_EQ(0x4900000000U, x86_64.pc());
}
TEST_F(RegsTest, mips_verify_sp_pc) {
RegsMips mips;
uint32_t* regs = reinterpret_cast<uint32_t*>(mips.RawData());
regs[29] = 0x100;
regs[32] = 0x200;
EXPECT_EQ(0x100U, mips.sp());
EXPECT_EQ(0x200U, mips.pc());
}
TEST_F(RegsTest, mips64_verify_sp_pc) {
RegsMips64 mips64;
uint64_t* regs = reinterpret_cast<uint64_t*>(mips64.RawData());
regs[29] = 0xb100000000ULL;
regs[32] = 0xc200000000ULL;
EXPECT_EQ(0xb100000000U, mips64.sp());
EXPECT_EQ(0xc200000000U, mips64.pc());
}
TEST_F(RegsTest, machine_type) {
RegsArm arm_regs;
EXPECT_EQ(ARCH_ARM, arm_regs.Arch());
RegsArm64 arm64_regs;
EXPECT_EQ(ARCH_ARM64, arm64_regs.Arch());
RegsX86 x86_regs;
EXPECT_EQ(ARCH_X86, x86_regs.Arch());
RegsX86_64 x86_64_regs;
EXPECT_EQ(ARCH_X86_64, x86_64_regs.Arch());
RegsMips mips_regs;
EXPECT_EQ(ARCH_MIPS, mips_regs.Arch());
RegsMips64 mips64_regs;
EXPECT_EQ(ARCH_MIPS64, mips64_regs.Arch());
}
template <typename RegisterType>
void clone_test(Regs* regs) {
RegisterType* register_values = reinterpret_cast<RegisterType*>(regs->RawData());
int num_regs = regs->total_regs();
for (int i = 0; i < num_regs; ++i) {
register_values[i] = i;
}
std::unique_ptr<Regs> clone(regs->Clone());
ASSERT_EQ(regs->total_regs(), clone->total_regs());
RegisterType* clone_values = reinterpret_cast<RegisterType*>(clone->RawData());
for (int i = 0; i < num_regs; ++i) {
EXPECT_EQ(register_values[i], clone_values[i]);
EXPECT_NE(&register_values[i], &clone_values[i]);
}
}
TEST_F(RegsTest, clone) {
std::vector<std::unique_ptr<Regs>> regs;
regs.emplace_back(new RegsArm());
regs.emplace_back(new RegsArm64());
regs.emplace_back(new RegsX86());
regs.emplace_back(new RegsX86_64());
regs.emplace_back(new RegsMips());
regs.emplace_back(new RegsMips64());
for (auto& r : regs) {
if (r->Is32Bit()) {
clone_test<uint32_t>(r.get());
} else {
clone_test<uint64_t>(r.get());
}
}
}
} // namespace unwindstack
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