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LLVM: load .pdata section

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This commit is contained in:
Nekotekina 2017-03-20 16:23:50 +03:00
parent 4fc8276f0f
commit ad72168143
2 changed files with 51 additions and 82 deletions
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130
Utilities/JIT.cpp
View File

@ -54,10 +54,6 @@ static void* const s_memory = []() -> void*
static u8* s_code_addr;
static u64 s_code_size;
// EH frames
static u8* s_unwind_info;
static u64 s_unwind_size;
#ifdef _WIN32
static std::vector<std::vector<RUNTIME_FUNCTION>> s_unwind; // .pdata
#endif
@ -193,8 +189,27 @@ struct MemoryManager final : llvm::RTDyldMemoryManager
virtual void registerEHFrames(u8* addr, u64 load_addr, std::size_t size) override
{
s_unwind_info = addr;
s_unwind_size = size;
#ifdef _WIN32
// Use s_memory as a BASE, compute the difference
const u64 code_diff = (u64)s_code_addr - (u64)s_memory;
const u64 unwind_diff = (u64)addr - (u64)s_memory;
// Fix RUNTIME_FUNCTION records (.pdata section)
auto& pdata = s_unwind.back();
for (auto& rf : pdata)
{
rf.BeginAddress += static_cast<DWORD>(code_diff);
rf.EndAddress += static_cast<DWORD>(code_diff);
rf.UnwindData += static_cast<DWORD>(unwind_diff);
}
// Register .xdata UNWIND_INFO structs
if (!RtlAddFunctionTable(pdata.data(), (DWORD)pdata.size(), (u64)s_memory))
{
LOG_ERROR(GENERAL, "RtlAddFunctionTable() failed! Error %u", GetLastError());
}
#endif
return RTDyldMemoryManager::registerEHFrames(addr, load_addr, size);
}
@ -241,6 +256,36 @@ struct EventListener final : llvm::JITEventListener
const llvm::StringRef elf = obj.getData();
fs::file(path, fs::rewrite).write(elf.data(), elf.size());
}
#ifdef _WIN32
for (auto it = obj.section_begin(), end = obj.section_end(); it != end; ++it)
{
llvm::StringRef name;
it->getName(name);
if (name == ".pdata")
{
llvm::StringRef data;
it->getContents(data);
std::vector<RUNTIME_FUNCTION> rfs(data.size() / sizeof(RUNTIME_FUNCTION));
auto offsets = reinterpret_cast<DWORD*>(rfs.data());
// Initialize .pdata section using relocation info
for (auto ri = it->relocation_begin(), end = it->relocation_end(); ri != end; ++ri)
{
if (ri->getType() == 3 /*R_X86_64_GOT32*/)
{
const u64 value = *reinterpret_cast<const DWORD*>(data.data() + ri->getOffset());
offsets[ri->getOffset() / sizeof(DWORD)] = static_cast<DWORD>(value + ri->getSymbol()->getAddress().get());
}
}
s_unwind.emplace_back(std::move(rfs));
}
}
#endif
}
};
@ -250,8 +295,6 @@ jit_compiler::jit_compiler(std::unordered_map<std::string, std::uintptr_t> init_
: m_link(std::move(init_linkage_info))
, m_cpu(std::move(_cpu))
{
verify(HERE), s_memory;
// Initialization
llvm::InitializeNativeTarget();
llvm::InitializeNativeTargetAsmPrinter();
@ -282,7 +325,6 @@ jit_compiler::jit_compiler(std::unordered_map<std::string, std::uintptr_t> init_
fmt::throw_exception("LLVM: Failed to create ExecutionEngine: %s", result);
}
m_engine->setProcessAllSections(true); // ???
m_engine->RegisterJITEventListener(&s_listener);
}
@ -308,8 +350,6 @@ void jit_compiler::load(std::unique_ptr<llvm::Module> module, std::unique_ptr<ll
m_map[name] = m_engine->getFunctionAddress(name);
}
}
init();
}
void jit_compiler::make(std::unique_ptr<llvm::Module> module, std::string path)
@ -336,74 +376,6 @@ void jit_compiler::make(std::unique_ptr<llvm::Module> module, std::string path)
// Delete IR to lower memory consumption
func.deleteBody();
}
init();
}
void jit_compiler::init()
{
#ifdef _WIN32
// Register .xdata UNWIND_INFO (.pdata section is empty for some reason)
std::set<u64> func_set;
for (const auto& pair : m_map)
{
func_set.emplace(pair.second);
}
const u64 base = (u64)s_memory;
const u8* bits = s_unwind_info;
std::vector<RUNTIME_FUNCTION> unwind;
unwind.reserve(m_map.size());
for (const u64 addr : func_set)
{
// Find next function address
const auto _next = func_set.upper_bound(addr);
const u64 next = _next != func_set.end() ? *_next : (u64)s_code_addr + s_code_size;
// Generate RUNTIME_FUNCTION record
RUNTIME_FUNCTION uw;
uw.BeginAddress = static_cast<u32>(addr - base);
uw.EndAddress = static_cast<u32>(next - base);
uw.UnwindData = static_cast<u32>((u64)bits - base);
unwind.emplace_back(uw);
// Parse .xdata UNWIND_INFO record
const u8 flags = *bits++; // Version and flags
const u8 prolog = *bits++; // Size of prolog
const u8 count = *bits++; // Count of unwind codes
const u8 frame = *bits++; // Frame Reg + Off
bits += ::align(std::max<u8>(1, count), 2) * sizeof(u16); // UNWIND_CODE array
if (flags != 1)
{
// Can't happen for trivial code
LOG_ERROR(GENERAL, "LLVM: unsupported UNWIND_INFO version/flags (0x%02x)", flags);
break;
}
LOG_TRACE(GENERAL, "LLVM: .xdata at 0x%llx: function 0x%x..0x%x: p0x%02x, c0x%02x, f0x%02x", uw.UnwindData + base, uw.BeginAddress + base, uw.EndAddress + base, prolog, count, frame);
}
if (s_unwind_info + s_unwind_size != bits)
{
LOG_ERROR(GENERAL, "LLVM: .xdata analysis failed! (%p != %p)", s_unwind_info + s_unwind_size, bits);
}
else if (!RtlAddFunctionTable(unwind.data(), (DWORD)unwind.size(), base))
{
LOG_ERROR(GENERAL, "RtlAddFunctionTable(%p) failed! Error %u", s_unwind_info, GetLastError());
}
else
{
LOG_NOTICE(GENERAL, "LLVM: UNWIND_INFO registered (%p, size=0x%llx)", s_unwind_info, s_unwind_size);
}
s_unwind.emplace_back(std::move(unwind));
#else
// TODO: register EH frames if necessary
#endif
}
jit_compiler::~jit_compiler()

3
Utilities/JIT.h
View File

@ -37,9 +37,6 @@ class jit_compiler final
// Arch
std::string m_cpu;
// Internal
void init();
public:
jit_compiler(std::unordered_map<std::string, std::uintptr_t>, std::string _cpu);
~jit_compiler();