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//===- bolt/unittest/Core/BinaryContext.cpp -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "bolt/Core/BinaryContext.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Support/TargetSelect.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace llvm::object;
using namespace llvm::ELF;
using namespace bolt;
namespace {
struct BinaryContextTester : public testing::TestWithParam<Triple::ArchType> {
void SetUp() override {
initalizeLLVM();
prepareElf();
initializeBOLT();
}
protected:
void initalizeLLVM() {
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
}
void prepareElf() {
memcpy(ElfBuf, "\177ELF", 4);
ELF64LE::Ehdr *EHdr = reinterpret_cast<typename ELF64LE::Ehdr *>(ElfBuf);
EHdr->e_ident[llvm::ELF::EI_CLASS] = llvm::ELF::ELFCLASS64;
EHdr->e_ident[llvm::ELF::EI_DATA] = llvm::ELF::ELFDATA2LSB;
EHdr->e_machine = GetParam() == Triple::aarch64 ? EM_AARCH64 : EM_X86_64;
MemoryBufferRef Source(StringRef(ElfBuf, sizeof(ElfBuf)), "ELF");
ObjFile = cantFail(ObjectFile::createObjectFile(Source));
}
void initializeBOLT() {
BC = cantFail(BinaryContext::createBinaryContext(
ObjFile->makeTriple(), ObjFile->getFileName(), nullptr, true,
DWARFContext::create(*ObjFile.get()), {llvm::outs(), llvm::errs()}));
ASSERT_FALSE(!BC);
}
char ElfBuf[sizeof(typename ELF64LE::Ehdr)] = {};
std::unique_ptr<ObjectFile> ObjFile;
std::unique_ptr<BinaryContext> BC;
};
} // namespace
#ifdef X86_AVAILABLE
INSTANTIATE_TEST_SUITE_P(X86, BinaryContextTester,
::testing::Values(Triple::x86_64));
#endif
#ifdef AARCH64_AVAILABLE
INSTANTIATE_TEST_SUITE_P(AArch64, BinaryContextTester,
::testing::Values(Triple::aarch64));
TEST_P(BinaryContextTester, FlushPendingRelocCALL26) {
if (GetParam() != Triple::aarch64)
GTEST_SKIP();
// This test checks that encodeValueAArch64 used by flushPendingRelocations
// returns correctly encoded values for CALL26 relocation for both backward
// and forward branches.
//
// The offsets layout is:
// 4: func1
// 8: bl func1
// 12: bl func2
// 16: func2
constexpr size_t DataSize = 20;
uint8_t *Data = new uint8_t[DataSize];
BinarySection &BS = BC->registerOrUpdateSection(
".text", ELF::SHT_PROGBITS, ELF::SHF_EXECINSTR | ELF::SHF_ALLOC, Data,
DataSize, 4);
MCSymbol *RelSymbol1 = BC->getOrCreateGlobalSymbol(4, "Func1");
ASSERT_TRUE(RelSymbol1);
BS.addRelocation(8, RelSymbol1, ELF::R_AARCH64_CALL26, 0, 0, true);
MCSymbol *RelSymbol2 = BC->getOrCreateGlobalSymbol(16, "Func2");
ASSERT_TRUE(RelSymbol2);
BS.addRelocation(12, RelSymbol2, ELF::R_AARCH64_CALL26, 0, 0, true);
std::error_code EC;
SmallVector<char> Vect(DataSize);
raw_svector_ostream OS(Vect);
BS.flushPendingRelocations(OS, [&](const MCSymbol *S) {
return S == RelSymbol1 ? 4 : S == RelSymbol2 ? 16 : 0;
});
const uint8_t Func1Call[4] = {255, 255, 255, 151};
const uint8_t Func2Call[4] = {1, 0, 0, 148};
EXPECT_FALSE(memcmp(Func1Call, &Vect[8], 4)) << "Wrong backward call value\n";
EXPECT_FALSE(memcmp(Func2Call, &Vect[12], 4)) << "Wrong forward call value\n";
}
TEST_P(BinaryContextTester, FlushPendingRelocJUMP26) {
if (GetParam() != Triple::aarch64)
GTEST_SKIP();
// This test checks that encodeValueAArch64 used by flushPendingRelocations
// returns correctly encoded values for R_AARCH64_JUMP26 relocation for both
// backward and forward branches.
//
// The offsets layout is:
// 4: func1
// 8: b func1
// 12: b func2
// 16: func2
const uint64_t Size = 20;
char *Data = new char[Size];
BinarySection &BS = BC->registerOrUpdateSection(
".text", ELF::SHT_PROGBITS, ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
(uint8_t *)Data, Size, 4);
MCSymbol *RelSymbol1 = BC->getOrCreateGlobalSymbol(4, "Func1");
ASSERT_TRUE(RelSymbol1);
BS.addRelocation(8, RelSymbol1, ELF::R_AARCH64_JUMP26, 0, 0, true);
MCSymbol *RelSymbol2 = BC->getOrCreateGlobalSymbol(16, "Func2");
ASSERT_TRUE(RelSymbol2);
BS.addRelocation(12, RelSymbol2, ELF::R_AARCH64_JUMP26, 0, 0, true);
std::error_code EC;
SmallVector<char> Vect(Size);
raw_svector_ostream OS(Vect);
BS.flushPendingRelocations(OS, [&](const MCSymbol *S) {
return S == RelSymbol1 ? 4 : S == RelSymbol2 ? 16 : 0;
});
const uint8_t Func1Call[4] = {255, 255, 255, 23};
const uint8_t Func2Call[4] = {1, 0, 0, 20};
EXPECT_FALSE(memcmp(Func1Call, &Vect[8], 4))
<< "Wrong backward branch value\n";
EXPECT_FALSE(memcmp(Func2Call, &Vect[12], 4))
<< "Wrong forward branch value\n";
}
#endif
TEST_P(BinaryContextTester, BaseAddress) {
// Check that base address calculation is correct for a binary with the
// following segment layout:
BC->SegmentMapInfo[0] = SegmentInfo{0, 0x10e8c2b4, 0, 0x10e8c2b4, 0x1000};
BC->SegmentMapInfo[0x10e8d2b4] =
SegmentInfo{0x10e8d2b4, 0x3952faec, 0x10e8c2b4, 0x3952faec, 0x1000};
BC->SegmentMapInfo[0x4a3bddc0] =
SegmentInfo{0x4a3bddc0, 0x148e828, 0x4a3bbdc0, 0x148e828, 0x1000};
BC->SegmentMapInfo[0x4b84d5e8] =
SegmentInfo{0x4b84d5e8, 0x294f830, 0x4b84a5e8, 0x3d3820, 0x1000};
std::optional<uint64_t> BaseAddress =
BC->getBaseAddressForMapping(0x7f13f5556000, 0x10e8c000);
ASSERT_TRUE(BaseAddress.has_value());
ASSERT_EQ(*BaseAddress, 0x7f13e46c9000ULL);
BaseAddress = BC->getBaseAddressForMapping(0x7f13f5556000, 0x137a000);
ASSERT_FALSE(BaseAddress.has_value());
}
TEST_P(BinaryContextTester, BaseAddress2) {
// Check that base address calculation is correct for a binary if the
// alignment in ELF file are different from pagesize.
// The segment layout is as follows:
BC->SegmentMapInfo[0] = SegmentInfo{0, 0x2177c, 0, 0x2177c, 0x10000};
BC->SegmentMapInfo[0x31860] =
SegmentInfo{0x31860, 0x370, 0x21860, 0x370, 0x10000};
BC->SegmentMapInfo[0x41c20] =
SegmentInfo{0x41c20, 0x1f8, 0x21c20, 0x1f8, 0x10000};
BC->SegmentMapInfo[0x54e18] =
SegmentInfo{0x54e18, 0x51, 0x24e18, 0x51, 0x10000};
std::optional<uint64_t> BaseAddress =
BC->getBaseAddressForMapping(0xaaaaea444000, 0x21000);
ASSERT_TRUE(BaseAddress.has_value());
ASSERT_EQ(*BaseAddress, 0xaaaaea413000ULL);
BaseAddress = BC->getBaseAddressForMapping(0xaaaaea444000, 0x11000);
ASSERT_FALSE(BaseAddress.has_value());
}
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