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JitCodeBuffer: Flush cache after committing code on ARM CPUs

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ARM's instruction and data caches are not coherent, so we need to flush
before executing to ensure there's no stale data left over.
This commit is contained in:
Connor McLaughlin 2019-12-03 20:21:30 +10:00
parent bbe1cb5fe9
commit 98e67616ec
2 changed files with 62 additions and 33 deletions
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63
src/common/jit_code_buffer.cpp
View file

@ -7,14 +7,26 @@
#include <sys/mman.h>
#endif
JitCodeBuffer::JitCodeBuffer(size_t size /* = 64 * 1024 * 1024 */, size_t far_code_size /* = 0 */)
static void DoCacheFlush(u8* address, u32 len)
{
#if defined(Y_PLATFORM_WINDOWS)
FlushInstructionCache(GetCurrentProcess(), address, len);
#elif defined(Y_COMPILER_GCC) || defined(Y_COMPILER_CLANG)
__clear_cache(address, address + len);
#else
#error Unknown platform.
#endif
}
JitCodeBuffer::JitCodeBuffer(u32 size /* = 64 * 1024 * 1024 */, u32 far_code_size /* = 0 */)
{
m_total_size = size + far_code_size;
#if defined(Y_PLATFORM_WINDOWS)
m_code_ptr = VirtualAlloc(nullptr, m_total_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
m_code_ptr = static_cast<u8*>(VirtualAlloc(nullptr, m_total_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE));
#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
m_code_ptr = mmap(nullptr, m_total_size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
m_code_ptr = static_cast<u8*>(
mmap(nullptr, m_total_size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
#else
m_code_ptr = nullptr;
#endif
@ -39,28 +51,45 @@ JitCodeBuffer::~JitCodeBuffer()
#endif
}
void JitCodeBuffer::CommitCode(size_t length)
void JitCodeBuffer::CommitCode(u32 length)
{
if (length == 0)
return;
#if defined(Y_CPU_ARM) || defined(Y_CPU_AARCH64)
// ARM instruction and data caches are not coherent, we need to flush after every block.
DoCacheFlush(m_free_code_ptr, length);
#endif
Assert(length <= (m_code_size - m_code_used));
m_free_code_ptr = reinterpret_cast<u8*>(m_free_code_ptr) + length;
m_free_code_ptr += length;
m_code_used += length;
}
void JitCodeBuffer::CommitFarCode(size_t length)
void JitCodeBuffer::CommitFarCode(u32 length)
{
if (length == 0)
return;
#if defined(Y_CPU_ARM) || defined(Y_CPU_AARCH64)
// ARM instruction and data caches are not coherent, we need to flush after every block.
DoCacheFlush(m_free_code_ptr, length);
#endif
Assert(length <= (m_far_code_size - m_far_code_used));
m_free_far_code_ptr = reinterpret_cast<u8*>(m_free_far_code_ptr) + length;
m_free_far_code_ptr += length;
m_far_code_used += length;
}
void JitCodeBuffer::Reset()
{
#if defined(Y_PLATFORM_WINDOWS)
FlushInstructionCache(GetCurrentProcess(), m_code_ptr, m_total_size);
#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
// TODO
#endif
std::memset(m_code_ptr, 0, m_code_size);
DoCacheFlush(m_code_ptr, m_code_size);
if (m_far_code_size > 0)
{
std::memset(m_far_code_ptr, 0, m_far_code_size);
DoCacheFlush(m_far_code_ptr, m_far_code_size);
}
m_free_code_ptr = m_code_ptr;
m_code_used = 0;
@ -71,11 +100,11 @@ void JitCodeBuffer::Reset()
void JitCodeBuffer::Align(u32 alignment, u8 padding_value)
{
DebugAssert(Common::IsPow2(alignment));
const size_t num_padding_bytes =
std::min(static_cast<size_t>(Common::AlignUpPow2(reinterpret_cast<uintptr_t>(m_free_code_ptr), alignment) -
reinterpret_cast<uintptr_t>(m_free_code_ptr)),
const u32 num_padding_bytes =
std::min(static_cast<u32>(Common::AlignUpPow2(reinterpret_cast<uintptr_t>(m_free_code_ptr), alignment) -
reinterpret_cast<uintptr_t>(m_free_code_ptr)),
GetFreeCodeSpace());
std::memset(m_free_code_ptr, padding_value, num_padding_bytes);
m_free_code_ptr = reinterpret_cast<char*>(m_free_code_ptr) + num_padding_bytes;
m_free_code_ptr += num_padding_bytes;
m_code_used += num_padding_bytes;
}

32
src/common/jit_code_buffer.h
View file

@ -4,34 +4,34 @@
class JitCodeBuffer
{
public:
JitCodeBuffer(size_t size = 64 * 1024 * 1024, size_t far_code_size = 0);
JitCodeBuffer(u32 size = 64 * 1024 * 1024, u32 far_code_size = 0);
~JitCodeBuffer();
void Reset();
void* GetFreeCodePointer() const { return m_free_code_ptr; }
size_t GetFreeCodeSpace() const { return (m_code_size - m_code_used); }
void CommitCode(size_t length);
u8* GetFreeCodePointer() const { return m_free_code_ptr; }
u32 GetFreeCodeSpace() const { return static_cast<u32>(m_code_size - m_code_used); }
void CommitCode(u32 length);
void* GetFreeFarCodePointer() const { return m_free_far_code_ptr; }
size_t GetFreeFarCodeSpace() const { return (m_far_code_size - m_far_code_used); }
void CommitFarCode(size_t length);
u8* GetFreeFarCodePointer() const { return m_free_far_code_ptr; }
u32 GetFreeFarCodeSpace() const { return static_cast<u32>(m_far_code_size - m_far_code_used); }
void CommitFarCode(u32 length);
/// Adjusts the free code pointer to the specified alignment, padding with bytes.
/// Assumes alignment is a power-of-two.
void Align(u32 alignment, u8 padding_value);
private:
void* m_code_ptr;
void* m_free_code_ptr;
size_t m_code_size;
size_t m_code_used;
u8* m_code_ptr;
u8* m_free_code_ptr;
u32 m_code_size;
u32 m_code_used;
void* m_far_code_ptr;
void* m_free_far_code_ptr;
size_t m_far_code_size;
size_t m_far_code_used;
u8* m_far_code_ptr;
u8* m_free_far_code_ptr;
u32 m_far_code_size;
u32 m_far_code_used;
size_t m_total_size;
u32 m_total_size;
};