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469 lines
15 KiB
469 lines
15 KiB
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/eh-frame.h"
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#include "test/unittests/test-utils.h"
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// Test enabled only on supported architectures.
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#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_ARM) || \
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defined(V8_TARGET_ARCH_ARM64)
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using namespace v8::internal;
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namespace {
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class EhFrameWriterTest : public TestWithZone {
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protected:
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// Being a 7bit positive integer, this also serves as its ULEB128 encoding.
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static const int kTestRegisterCode = 0;
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static EhFrameIterator MakeIterator(EhFrameWriter* writer) {
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CodeDesc desc;
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writer->GetEhFrame(&desc);
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DCHECK_GT(desc.unwinding_info_size, 0);
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return EhFrameIterator(desc.unwinding_info,
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desc.unwinding_info + desc.unwinding_info_size);
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}
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};
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const int EhFrameWriterTest::kTestRegisterCode;
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} // namespace
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TEST_F(EhFrameWriterTest, Alignment) {
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(42 * EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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ASSERT_EQ(0, EhFrameConstants::kEhFrameHdrSize % 4);
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ASSERT_EQ(0, EhFrameConstants::kEhFrameTerminatorSize % 4);
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EXPECT_EQ(0, (iterator.GetBufferSize() - EhFrameConstants::kEhFrameHdrSize -
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EhFrameConstants::kEhFrameTerminatorSize) %
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kPointerSize);
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}
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TEST_F(EhFrameWriterTest, FDEHeader) {
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static const int kProcedureSize = 0x5678abcd;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.Finish(kProcedureSize);
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EhFrameIterator iterator = MakeIterator(&writer);
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int cie_size = iterator.GetNextUInt32();
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iterator.Skip(cie_size);
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int fde_size = iterator.GetNextUInt32();
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EXPECT_EQ(iterator.GetBufferSize(),
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fde_size + cie_size + EhFrameConstants::kEhFrameTerminatorSize +
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EhFrameConstants::kEhFrameHdrSize + 2 * kInt32Size);
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int backwards_offset_to_cie_offset = iterator.GetCurrentOffset();
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int backwards_offset_to_cie = iterator.GetNextUInt32();
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EXPECT_EQ(backwards_offset_to_cie_offset, backwards_offset_to_cie);
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int procedure_address_offset = iterator.GetCurrentOffset();
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int procedure_address = iterator.GetNextUInt32();
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EXPECT_EQ(-(procedure_address_offset + RoundUp(kProcedureSize, 8)),
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procedure_address);
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int procedure_size = iterator.GetNextUInt32();
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EXPECT_EQ(kProcedureSize, procedure_size);
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}
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TEST_F(EhFrameWriterTest, SetOffset) {
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static const uint32_t kOffset = 0x0badc0de;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.SetBaseAddressOffset(kOffset);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset,
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iterator.GetNextOpcode());
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EXPECT_EQ(kOffset, iterator.GetNextULeb128());
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}
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TEST_F(EhFrameWriterTest, IncreaseOffset) {
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static const uint32_t kFirstOffset = 121;
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static const uint32_t kSecondOffset = 16;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.SetBaseAddressOffset(kFirstOffset);
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writer.IncreaseBaseAddressOffset(kSecondOffset);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset,
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iterator.GetNextOpcode());
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EXPECT_EQ(kFirstOffset, iterator.GetNextULeb128());
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset,
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iterator.GetNextOpcode());
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EXPECT_EQ(kFirstOffset + kSecondOffset, iterator.GetNextULeb128());
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}
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TEST_F(EhFrameWriterTest, SetRegister) {
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Register test_register = Register::from_code(kTestRegisterCode);
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.SetBaseAddressRegister(test_register);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaRegister,
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iterator.GetNextOpcode());
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EXPECT_EQ(static_cast<uint32_t>(kTestRegisterCode),
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iterator.GetNextULeb128());
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}
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TEST_F(EhFrameWriterTest, SetRegisterAndOffset) {
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Register test_register = Register::from_code(kTestRegisterCode);
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static const uint32_t kOffset = 0x0badc0de;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.SetBaseAddressRegisterAndOffset(test_register, kOffset);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfa, iterator.GetNextOpcode());
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EXPECT_EQ(static_cast<uint32_t>(kTestRegisterCode),
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iterator.GetNextULeb128());
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EXPECT_EQ(kOffset, iterator.GetNextULeb128());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding6bit) {
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static const int kOffset = 42;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ((1 << 6) | kOffset, iterator.GetNextByte());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding6bitDelta) {
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static const int kFirstOffset = 42;
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static const int kSecondOffset = 62;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.AdvanceLocation(kSecondOffset *
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EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ((1 << 6) | kFirstOffset, iterator.GetNextByte());
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EXPECT_EQ((1 << 6) | (kSecondOffset - kFirstOffset), iterator.GetNextByte());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding8bit) {
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static const int kOffset = 0x42;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
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iterator.GetNextOpcode());
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EXPECT_EQ(kOffset, iterator.GetNextByte());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding8bitDelta) {
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static const int kFirstOffset = 0x10;
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static const int kSecondOffset = 0x70;
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static const int kThirdOffset = 0xb5;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.AdvanceLocation(kSecondOffset *
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EhFrameConstants::kCodeAlignmentFactor);
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writer.AdvanceLocation(kThirdOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ((1 << 6) | kFirstOffset, iterator.GetNextByte());
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
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iterator.GetNextOpcode());
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EXPECT_EQ(kSecondOffset - kFirstOffset, iterator.GetNextByte());
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
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iterator.GetNextOpcode());
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EXPECT_EQ(kThirdOffset - kSecondOffset, iterator.GetNextByte());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding16bit) {
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static const int kOffset = kMaxUInt8 + 42;
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ASSERT_LT(kOffset, kMaxUInt16);
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2,
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iterator.GetNextOpcode());
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EXPECT_EQ(kOffset, iterator.GetNextUInt16());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding16bitDelta) {
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static const int kFirstOffset = 0x41;
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static const int kSecondOffset = kMaxUInt8 + 0x42;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.AdvanceLocation(kSecondOffset *
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EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
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iterator.GetNextOpcode());
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EXPECT_EQ(kFirstOffset, iterator.GetNextByte());
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2,
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iterator.GetNextOpcode());
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EXPECT_EQ(kSecondOffset - kFirstOffset, iterator.GetNextUInt16());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding32bit) {
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static const uint32_t kOffset = kMaxUInt16 + 42;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4,
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iterator.GetNextOpcode());
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EXPECT_EQ(kOffset, iterator.GetNextUInt32());
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}
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TEST_F(EhFrameWriterTest, PcOffsetEncoding32bitDelta) {
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static const uint32_t kFirstOffset = kMaxUInt16 + 0x42;
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static const uint32_t kSecondOffset = kMaxUInt16 + 0x67;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
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writer.AdvanceLocation(kSecondOffset *
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EhFrameConstants::kCodeAlignmentFactor);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4,
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iterator.GetNextOpcode());
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EXPECT_EQ(kFirstOffset, iterator.GetNextUInt32());
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EXPECT_EQ((1 << 6) | (kSecondOffset - kFirstOffset), iterator.GetNextByte());
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}
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TEST_F(EhFrameWriterTest, SaveRegisterUnsignedOffset) {
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Register test_register = Register::from_code(kTestRegisterCode);
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static const int kOffset =
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EhFrameConstants::kDataAlignmentFactor > 0 ? 12344 : -12344;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.RecordRegisterSavedToStack(test_register, kOffset);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ((2 << 6) | kTestRegisterCode, iterator.GetNextByte());
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EXPECT_EQ(
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static_cast<uint32_t>(kOffset / EhFrameConstants::kDataAlignmentFactor),
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iterator.GetNextULeb128());
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}
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TEST_F(EhFrameWriterTest, SaveRegisterSignedOffset) {
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Register test_register = Register::from_code(kTestRegisterCode);
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static const int kOffset =
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EhFrameConstants::kDataAlignmentFactor < 0 ? 12344 : -12344;
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ASSERT_EQ(kOffset % EhFrameConstants::kDataAlignmentFactor, 0);
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.RecordRegisterSavedToStack(test_register, kOffset);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kOffsetExtendedSf,
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iterator.GetNextOpcode());
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EXPECT_EQ(static_cast<uint32_t>(kTestRegisterCode),
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iterator.GetNextULeb128());
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EXPECT_EQ(kOffset / EhFrameConstants::kDataAlignmentFactor,
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iterator.GetNextSLeb128());
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}
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TEST_F(EhFrameWriterTest, RegisterNotModified) {
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Register test_register = Register::from_code(kTestRegisterCode);
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.RecordRegisterNotModified(test_register);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kSameValue,
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iterator.GetNextOpcode());
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EXPECT_EQ(static_cast<uint32_t>(kTestRegisterCode),
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iterator.GetNextULeb128());
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}
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TEST_F(EhFrameWriterTest, RegisterFollowsInitialRule) {
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Register test_register = Register::from_code(kTestRegisterCode);
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.RecordRegisterFollowsInitialRule(test_register);
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writer.Finish(100);
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EhFrameIterator iterator = MakeIterator(&writer);
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iterator.SkipToFdeDirectives();
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EXPECT_EQ((3 << 6) | kTestRegisterCode, iterator.GetNextByte());
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}
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TEST_F(EhFrameWriterTest, EhFrameHdrLayout) {
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static const int kCodeSize = 10;
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static const int kPaddingSize = 6;
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EhFrameWriter writer(zone());
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writer.Initialize();
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writer.Finish(kCodeSize);
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EhFrameIterator iterator = MakeIterator(&writer);
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// Skip the .eh_frame.
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int encoded_cie_size = iterator.GetNextUInt32();
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iterator.Skip(encoded_cie_size);
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int cie_size = encoded_cie_size + kInt32Size;
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int encoded_fde_size = iterator.GetNextUInt32();
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iterator.Skip(encoded_fde_size);
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int fde_size = encoded_fde_size + kInt32Size;
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iterator.Skip(EhFrameConstants::kEhFrameTerminatorSize);
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int eh_frame_size =
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cie_size + fde_size + EhFrameConstants::kEhFrameTerminatorSize;
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//
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// Plugging some numbers in the DSO layout shown in eh-frame.cc:
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//
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// | ... |
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// +---------------+ <-- (E) ---------
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// | | ^
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// | Instructions | 10 bytes | .text
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// | | v
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// +---------------+ <----------------
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// |///////////////|
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// |////Padding////| 6 bytes
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// |///////////////|
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// +---------------+ <---(D)----------
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// | | ^
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// | CIE | cie_size bytes* |
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// | | |
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// +---------------+ <-- (C) |
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// | | | .eh_frame
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// | FDE | fde_size bytes |
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// | | |
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// +---------------+ |
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// | terminator | 4 bytes v
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// +---------------+ <-- (B) ---------
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// | version | ^
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// +---------------+ 4 bytes |
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// | encoding | |
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// | specifiers | |
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// +---------------+ <---(A) | .eh_frame_hdr
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// | offset to | |
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// | .eh_frame | |
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// +---------------+ |
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// | ... | ...
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//
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// (*) the size of the CIE is platform dependent.
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//
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int eh_frame_hdr_version = iterator.GetNextByte();
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EXPECT_EQ(EhFrameConstants::kEhFrameHdrVersion, eh_frame_hdr_version);
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// .eh_frame pointer encoding specifier.
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EXPECT_EQ(EhFrameConstants::kSData4 | EhFrameConstants::kPcRel,
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iterator.GetNextByte());
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// Lookup table size encoding specifier.
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EXPECT_EQ(EhFrameConstants::kUData4, iterator.GetNextByte());
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// Lookup table pointers encoding specifier.
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EXPECT_EQ(EhFrameConstants::kSData4 | EhFrameConstants::kDataRel,
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iterator.GetNextByte());
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// A -> D
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int offset_to_eh_frame = iterator.GetNextUInt32();
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EXPECT_EQ(-(EhFrameConstants::kFdeVersionSize +
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EhFrameConstants::kFdeEncodingSpecifiersSize + eh_frame_size),
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offset_to_eh_frame);
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int lut_entries = iterator.GetNextUInt32();
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EXPECT_EQ(1, lut_entries);
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// B -> E
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int offset_to_procedure = iterator.GetNextUInt32();
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EXPECT_EQ(-(eh_frame_size + kPaddingSize + kCodeSize), offset_to_procedure);
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// B -> C
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int offset_to_fde = iterator.GetNextUInt32();
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EXPECT_EQ(-(fde_size + EhFrameConstants::kEhFrameTerminatorSize),
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offset_to_fde);
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}
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#endif
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