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Add initial macOS support.

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This commit is contained in:
squidbus
2024-07-09 02:18:34 -07:00
committed by TheTurtle
parent 36d528743a
commit 66fa29059c
29 changed files with 523 additions and 26 deletions
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53
src/core/tls.cpp
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@@ -8,7 +8,7 @@
#ifdef _WIN32
#include <windows.h>
#else
#elif !defined(__APPLE__)
#include <asm/prctl.h> /* Definition of ARCH_* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#endif
@@ -88,6 +88,51 @@ static void PatchFsAccess(u8* code, const TLSPattern& tls_pattern, Xbyak::CodeGe
c.jmp(code + total_size); // Return to the instruction right after the mov.
}
#elif defined(__APPLE__)
static pthread_key_t slot = 0;
static std::once_flag slot_alloc_flag;
static void AllocTcbKey() {
ASSERT(pthread_key_create(&slot, nullptr) == 0);
}
void SetTcbBase(void* image_address) {
std::call_once(slot_alloc_flag, &AllocTcbKey);
ASSERT(pthread_setspecific(slot, image_address) == 0);
}
Tcb* GetTcbBase() {
std::call_once(slot_alloc_flag, &AllocTcbKey);
return reinterpret_cast<Tcb*>(pthread_getspecific(slot));
}
static void PatchFsAccess(u8* code, const TLSPattern& tls_pattern, Xbyak::CodeGenerator& c) {
using namespace Xbyak::util;
const auto total_size = tls_pattern.pattern_size + tls_pattern.imm_size;
// Allocate slot in the process if not done already.
std::call_once(slot_alloc_flag, &AllocTcbKey);
static constexpr u32 NearJmpSize = 5;
// Replace fs read with gs read.
auto patch = Xbyak::CodeGenerator(total_size, code);
patch.jmp(c.getCurr(), Xbyak::CodeGenerator::LabelType::T_NEAR);
patch.nop(total_size - NearJmpSize);
// Write the trampoline.
const auto target_reg = Xbyak::Reg64(tls_pattern.target_reg);
// The following logic is based on the Darwin implementation of _os_tsd_get_direct, used by pthread_getspecific
// https://github.com/apple/darwin-xnu/blob/main/libsyscall/os/tsd.h#L89-L96
c.putSeg(gs);
c.mov(target_reg, qword[reinterpret_cast<void*>(slot * sizeof(void*))]); // Load the slot data.
// Return to the instruction right after the mov.
c.jmp(code + total_size);
}
#else
static u32 slot = 0;
@@ -110,7 +155,6 @@ static void PatchFsAccess(u8* code, const TLSPattern& tls_pattern, Xbyak::CodeGe
// Replace fs read with gs read.
auto patch = Xbyak::CodeGenerator(total_size, code);
const auto target_reg = Xbyak::Reg64(tls_pattern.target_reg);
patch.putSeg(gs);
}
@@ -148,11 +192,6 @@ void PatchTLS(u64 segment_addr, u64 segment_size, Xbyak::CodeGenerator& c) {
}
ASSERT(offset == 0);
// Allocate slot in the process if not done already.
if (slot == 0) {
AllocTcbKey();
}
// Replace bogus instruction prefix with nops if it exists.
if (std::memcmp(code - BadPrefix.size(), BadPrefix.data(), sizeof(BadPrefix)) == 0) {
auto patch = Xbyak::CodeGenerator(BadPrefix.size(), code - BadPrefix.size());