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LLVM: generate trampolines

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Must fix issues with older CPUs
JIT.cpp refactored to use utils::memory*
This commit is contained in:
Nekotekina 2017-03-19 15:53:48 +03:00
parent c7a9a8e8f1
commit 560d6776af
1 changed files with 61 additions and 63 deletions
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126
Utilities/JIT.cpp
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@ -10,6 +10,7 @@
#include "StrFmt.h"
#include "File.h"
#include "Log.h"
#include "VirtualMemory.h"
#ifdef _MSC_VER
#pragma warning(push, 0)
@ -25,12 +26,6 @@
#ifdef _WIN32
#include <Windows.h>
#else
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#endif
#include "JIT.h"
@ -44,19 +39,15 @@ static const u64 s_memory_size = 0x20000000;
// Try to reserve a portion of virtual memory in the first 2 GB address space beforehand, if possible.
static void* const s_memory = []() -> void*
{
#ifdef _WIN32
for (u64 addr = 0x10000000; addr <= 0x60000000; addr += 0x1000000)
for (u64 addr = 0x10000000; addr <= 0x80000000 - s_memory_size; addr += 0x1000000)
{
if (VirtualAlloc((void*)addr, s_memory_size, MEM_RESERVE, PAGE_NOACCESS))
if (auto ptr = utils::memory_reserve(s_memory_size, (void*)addr))
{
return (void*)addr;
return ptr;
}
}
return VirtualAlloc(NULL, s_memory_size, MEM_RESERVE, PAGE_NOACCESS);
#else
return ::mmap((void*)0x10000000, s_memory_size, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
#endif
return utils::memory_reserve(s_memory_size);
}();
// Code section
@ -76,8 +67,12 @@ struct MemoryManager final : llvm::RTDyldMemoryManager
{
std::unordered_map<std::string, std::uintptr_t>& m_link;
std::array<u8, 16>* m_tramps;
MemoryManager(std::unordered_map<std::string, std::uintptr_t>& table)
: m_link(table)
, m_next(s_memory)
, m_tramps(nullptr)
{
}
@ -88,23 +83,57 @@ struct MemoryManager final : llvm::RTDyldMemoryManager
virtual u64 getSymbolAddress(const std::string& name) override
{
const auto found = m_link.find(name);
auto& addr = m_link[name];
if (found != m_link.end())
// Find function address
if (!addr)
{
return found->second;
}
addr = RTDyldMemoryManager::getSymbolAddress(name);
if (u64 addr = RTDyldMemoryManager::getSymbolAddress(name))
if (addr)
{
// This may be bad if LLVM requests some built-in functions like fma.
LOG_ERROR(GENERAL, "LLVM: Symbol requested: %s -> 0x%016llx", name, addr);
return addr;
LOG_WARNING(GENERAL, "LLVM: Symbol requested: %s -> 0x%016llx", name, addr);
}
else
{
// It's fine if some function is never called, for example.
LOG_ERROR(GENERAL, "LLVM: Symbol not found: %s", name);
return (u64)null;
LOG_ERROR(GENERAL, "LLVM: Linkage failed: %s", name);
addr = (u64)null;
}
}
// Verify address for small code model
if ((u64)s_memory > 0x80000000 - s_memory_size ? (u64)addr - (u64)s_memory >= s_memory_size : addr >= 0x80000000)
{
// Allocate memory for trampolines
if (!m_tramps)
{
m_tramps = reinterpret_cast<decltype(m_tramps)>(m_next);
utils::memory_commit(m_next, 4096, utils::protection::wx);
m_next = (u8*)((u64)m_next + 4096);
}
// Create a trampoline
auto& data = *m_tramps++;
data[0x0] = 0xff; // JMP [rip+2]
data[0x1] = 0x25;
data[0x2] = 0x02;
data[0x3] = 0x00;
data[0x4] = 0x00;
data[0x5] = 0x00;
data[0x6] = 0x48; // MOV rax, imm64 (not executed)
data[0x7] = 0xb8;
std::memcpy(data.data() + 8, &addr, 8);
addr = (u64)&data;
// Reset pointer (memory page exhausted)
if (((u64)m_tramps % 4096) == 0)
{
m_tramps = nullptr;
}
}
return addr;
}
virtual u8* allocateCodeSection(std::uintptr_t size, uint align, uint sec_id, llvm::StringRef sec_name) override
@ -118,16 +147,7 @@ struct MemoryManager final : llvm::RTDyldMemoryManager
return nullptr;
}
#ifdef _WIN32
if (!VirtualAlloc(m_next, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
#else
if (::mprotect(m_next, size, PROT_READ | PROT_WRITE | PROT_EXEC))
#endif
{
LOG_FATAL(GENERAL, "LLVM: Failed to allocate memory at %p", m_next);
return nullptr;
}
utils::memory_commit(m_next, size, utils::protection::wx);
s_code_addr = (u8*)m_next;
s_code_size = size;
@ -151,15 +171,7 @@ struct MemoryManager final : llvm::RTDyldMemoryManager
LOG_ERROR(GENERAL, "LLVM: Writeable data section not supported!");
}
#ifdef _WIN32
if (!VirtualAlloc(m_next, size, MEM_COMMIT, PAGE_READWRITE))
#else
if (::mprotect(m_next, size, PROT_READ | PROT_WRITE))
#endif
{
LOG_FATAL(GENERAL, "LLVM: Failed to allocate memory at %p", m_next);
return nullptr;
}
utils::memory_commit(m_next, size);
LOG_NOTICE(GENERAL, "LLVM: Data section %u '%s' allocated -> %p (size=0x%llx, aligned 0x%x, %s)", sec_id, sec_name.data(), m_next, size, align, is_ro ? "ro" : "rw");
return (u8*)std::exchange(m_next, (void*)next);
@ -206,23 +218,15 @@ struct MemoryManager final : llvm::RTDyldMemoryManager
}
s_unwind.clear();
if (!VirtualFree(s_memory, 0, MEM_DECOMMIT))
{
LOG_FATAL(GENERAL, "VirtualFree(%p) failed! Error %u", s_memory, GetLastError());
}
#else
if (!::mmap(s_memory, s_memory_size, PROT_NONE, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0))
{
LOG_FATAL(GENERAL, "mmap(%p) failed! Error %d", s_memory, errno);
}
// TODO: unregister EH frames if necessary
#endif
utils::memory_decommit(s_memory, s_memory_size);
}
private:
void* m_next = s_memory;
void* m_next;
};
// Helper class
@ -242,18 +246,10 @@ struct EventListener final : llvm::JITEventListener
static EventListener s_listener;
static void dummy()
{
}
jit_compiler::jit_compiler(std::unordered_map<std::string, std::uintptr_t> init_linkage_info, std::string _cpu)
: m_link(std::move(init_linkage_info))
, m_cpu(std::move(_cpu))
{
#ifdef _MSC_VER
m_link.emplace("__chkstk", (u64)&dummy);
#endif
verify(HERE), s_memory;
// Initialization
@ -277,7 +273,7 @@ jit_compiler::jit_compiler(std::unordered_map<std::string, std::uintptr_t> init_
.setErrorStr(&result)
.setMCJITMemoryManager(std::make_unique<MemoryManager>(m_link))
.setOptLevel(llvm::CodeGenOpt::Aggressive)
.setCodeModel((u64)s_memory <= 0x60000000 ? llvm::CodeModel::Small : llvm::CodeModel::Large) // TODO
.setCodeModel(llvm::CodeModel::Small)
.setMCPU(m_cpu)
.create());
@ -405,6 +401,8 @@ void jit_compiler::init()
}
s_unwind.emplace_back(std::move(unwind));
#else
// TODO: register EH frames if necessary
#endif
}