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Changed TlsData::get to read TLS slots directly from TEB on Windows x86/x64. (#461)

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This commit is contained in:
Branimir Karadžić
2026-10-15 17:36:45 -07:00
committed by GitHub
parent 983e0b9af7
commit c75bc2f956
4 changed files with 170 additions and 0 deletions
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73
include/bx/inline/thread.inl Normal file
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@@ -0,0 +1,73 @@
/*
* Copyright 2010-2026 Branimir Karadzic. All rights reserved.
* License: https://github.com/bkaradzic/bx/blob/master/LICENSE
*/
#ifndef BX_THREAD_H_HEADER_GUARD
# error "Must be included from bx/thread.h!"
#endif // BX_THREAD_H_HEADER_GUARD
#define BX_TLS_DATA_TEB (BX_PLATFORM_WINDOWS && BX_CPU_X86 && !BX_CRT_NONE)
#if BX_TLS_DATA_TEB
# if BX_COMPILER_MSVC
# if BX_ARCH_64BIT
extern "C" unsigned __int64 __readgsqword(unsigned long _offset);
# pragma intrinsic(__readgsqword)
# else
extern "C" unsigned long __readfsdword(unsigned long _offset);
# pragma intrinsic(__readfsdword)
# endif // BX_ARCH_64BIT
# endif // BX_COMPILER_MSVC
namespace bx
{
constexpr uint32_t kTebTlsSlotsOffset = BX_ARCH_64BIT ? 0x1480 : 0xe10;
constexpr uint32_t kTebTlsExpansionSlotsOffset = BX_ARCH_64BIT ? 0x1780 : 0xf94;
constexpr uint32_t kTebTlsSlotsNum = 64;
# if BX_COMPILER_MSVC && BX_ARCH_64BIT
inline void* readTeb(uint32_t _offset)
{
return (void*)__readgsqword(_offset);
}
# elif BX_COMPILER_MSVC
inline void* readTeb(uint32_t _offset)
{
return (void*)__readfsdword(_offset);
}
# elif BX_ARCH_64BIT
inline void* readTeb(uint32_t _offset)
{
void* ptr;
__asm__ volatile ("movq %%gs:(%1), %0" : "=r" (ptr) : "r" (uintptr_t(_offset) ) );
return ptr;
}
# else
inline void* readTeb(uint32_t _offset)
{
void* ptr;
__asm__ volatile ("movl %%fs:(%1), %0" : "=r" (ptr) : "r" (uintptr_t(_offset) ) );
return ptr;
}
# endif // BX_COMPILER_*
inline void* TlsData::get() const
{
const uint32_t slot = *(const uint32_t*)m_internal;
if (slot < kTebTlsSlotsNum) [[likely]]
{
return readTeb(kTebTlsSlotsOffset + slot*sizeof(void*) );
}
void** expansionSlots = (void**)readTeb(kTebTlsExpansionSlotsOffset);
return NULL == expansionSlots
? NULL
: expansionSlots[slot - kTebTlsSlotsNum]
;
}
} // namespace bx
#endif // BX_TLS_DATA_TEB

2
include/bx/thread.h
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@@ -97,6 +97,8 @@ namespace bx
} // namespace bx
#include "inline/thread.inl"
#endif
#endif // BX_THREAD_H_HEADER_GUARD