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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*++
Module Name:
optimizedtls.cpp
Abstract:
Implementation of platform-specific Thread local storage functions.
--*/
#include "pal/thread.hpp"
#include "pal/malloc.hpp"
#include <pthread.h>
#include "pal/dbgmsg.h"
#include "pal/misc.h"
#include "pal/debug.h"
#include <stddef.h>
using namespace CorUnix;
SET_DEFAULT_DEBUG_CHANNEL(THREAD);
#if defined(USE_OPTIMIZEDTLSGETTER)
#define PAL_safe_offsetof(s,m) ((size_t)((ptrdiff_t)&(char&)(((s *)64)->m))-64)
/*++
Function:
CorUnix::TLSMakeOptimizedGetter
Creates a platform-optimized version of TlsGetValue compiled
for a particular index.
Generates the hot part of CorUnix::InternalGetCurrentThread
as a chunk of highly optimized machine-specific code at runtime.
Check the difference between CorUnix::InternalGetCurrentThread and
CorUnix::InternalGetCurrentThreadSlow to see the C/C++ code that matches
the code generated by this function.
--*/
PAL_POPTIMIZEDTLSGETTER
CorUnix::TLSMakeOptimizedGetter(
IN CPalThread* pThread,
IN DWORD dwTlsIndex)
{
#ifdef BIT64
#pragma unused(pThread, dwTlsIndex)
ERROR("TLSMakeOptimizedGetter not rewritten for amd64 yet.");
return NULL;
#else
PAL_POPTIMIZEDTLSGETTER Ret = NULL;
BYTE* p;
int i = 0;
#ifdef __APPLE__
#define TLS_OPTIMIZED_GETTER_SIZE 118
#else
#define TLS_OPTIMIZED_GETTER_SIZE 115
#endif
p = (BYTE*)InternalMalloc(pThread, TLS_OPTIMIZED_GETTER_SIZE * sizeof(BYTE));
if (p == NULL)
{
return Ret;
}
// Need to preserve %ecx, %edx, and %esi registers as specified in
// GetThreadGeneric(void) in vm/i386/asmhelpers.s
p[i++] = 0x51; // push %ecx
p[i++] = 0x52; // push %edx
p[i++] = 0x89; // mov %esp,%eax // %eax = sp;
p[i++] = 0xe0;
p[i++] = 0xc1; // shr $0x11,%eax // sp >> 17;
p[i++] = 0xe8;
p[i++] = 0x11;
p[i++] = 0x89; // mov %eax,%edx // key = sp >> 17;
p[i++] = 0xc2;
p[i++] = 0xc1; // sar $0x7,%edx // key >> 7;
p[i++] = 0xfa;
p[i++] = 0x07;
p[i++] = 0x29; // sub %edx,%eax // key -= key >> 7;
p[i++] = 0xd0;
p[i++] = 0x89; // mov %eax,%edx
p[i++] = 0xc2;
p[i++] = 0xc1; // sar $0x5,%edx // key >> 5;
p[i++] = 0xfa;
p[i++] = 0x05;
p[i++] = 0x29; // sub %edx,%eax // key -= key >> 5;
p[i++] = 0xd0;
p[i++] = 0x89; // mov %eax,%edx
p[i++] = 0xc2;
p[i++] = 0xc1; // sar $0x3,%edx // key >> 3;
p[i++] = 0xfa;
p[i++] = 0x03;
p[i++] = 0x29; // sub %edx,%eax // key -= key >> 3;
p[i++] = 0xd0;
p[i++] = 0x25; // and $0xff,%eax // key &= 0xFF;
p[i++] = 0xff;
p[i++] = 0x00;
p[i++] = 0x00;
p[i++] = 0x00;
p[i++] = 0x8b; // mov (flush_counter),%ecx // %ecx = counter = flush_counter;
p[i++] = 0x0d;
*((DWORD*) &p[i]) = (DWORD)&flush_counter;
i += sizeof(DWORD);
p[i++] = 0x8b; // mov (thread_hints,%eax,4),%eax // %edx = pThread = thread_hints[key];
p[i++] = 0x14;
p[i++] = 0x85;
*((DWORD*) &p[i]) = (DWORD)&thread_hints;
i += sizeof(DWORD);
p[i++] = 0x39; // cmp %esp,offsetof(CPalThread,tlsInfo)+offsetof(CThreadTLSInfo,minStack)(%edx)
// if ((size_t)pThread->tlsInfo.minStack <= sp)
p[i++] = 0xa2;
*((DWORD*) &p[i]) = (DWORD)(PAL_safe_offsetof(CPalThread,tlsInfo)+PAL_safe_offsetof(CThreadTLSInfo,minStack));
i += sizeof(DWORD);
p[i++] = 0x77; // ja CallInternalGetCurrentThreadSlow:
p[i++] = 0x19;
p[i++] = 0x3b; // cmp offsetof(CPalThread,tlsInfo)+offsetof(CThreadTLSInfo,maxStack)(%edx),%esp
// if (sp < (size_t)pThread->tlsInfo.maxStack)
p[i++] = 0xa2;
*((DWORD*) &p[i]) = (DWORD)(PAL_safe_offsetof(CPalThread,tlsInfo)+PAL_safe_offsetof(CThreadTLSInfo,maxStack));
i += sizeof(DWORD);
p[i++] = 0x73; // jae CallInternalGetCurrentThreadSlow:
p[i++] = 0x11;
p[i++] = 0x39; // cmp (flush_counter),%ecx // if (counter == flush_counter)
p[i++] = 0x0d;
*((DWORD*) &p[i]) = (DWORD)&flush_counter;
i += sizeof(DWORD);
p[i++] = 0x75; // jne CallInternalGetCurrentThreadSlow:
p[i++] = 0x09;
if (dwTlsIndex != THREAD_OBJECT_TLS_INDEX)
{
p[i++] = 0x8b; // mov offsetof(pThread->tlsSlots[dwTlsIndex])(%edx),%eax // %eax = pThread->tlsSlots[dwTlsIndex];
p[i++] = 0x82;
*((DWORD*) &p[i]) = (DWORD)(PAL_safe_offsetof(CPalThread,tlsInfo)+PAL_safe_offsetof(CThreadTLSInfo,tlsSlots[dwTlsIndex]));
i += sizeof(DWORD);
}
else
{
p[i++] = 0x89; // mov %edx,%eax // %eax = pThread;
p[i++] = 0xd0;
p[i++] = 0x90; // nop
p[i++] = 0x90; // nop
p[i++] = 0x90; // nop
p[i++] = 0x90; // nop
}
p[i++] = 0x5a; // pop %edx
p[i++] = 0x59; // pop %ecx
p[i++] = 0xc3; // ret
// CallInternalGetCurrentThreadSlow:
p[i++] = 0x5a; // pop %edx
p[i++] = 0x59; // pop %ecx
p[i++] = 0x8d; // lea (thread_hints,%eax,4),%eax // %eax = &thread_hints[key];
p[i++] = 0x04;
p[i++] = 0x85;
*((DWORD*) &p[i]) = (DWORD)&thread_hints;
i += sizeof(DWORD);
p[i++] = 0x55; // push %ebp
p[i++] = 0x89; // mov %esp,%ebp
p[i++] = 0xe5;
p[i++] = 0x51; // push %ecx
p[i++] = 0x89; // mov %esp,%ecx // this is the reference esp - need to match the reference esp used in the fast path.
p[i++] = 0xe1;
p[i++] = 0x52; // push %edx
#ifdef __APPLE__
// establish 16-byte stack alignment
p[i++] = 0x83; // subl $8,%esp
p[i++] = 0xec;
p[i++] = 0x08;
#endif
p[i++] = 0x50; // push %eax // store &thread_hints[key] on stack as 2nd argument;
p[i++] = 0x51; // push %ecx // reference esp - The 1st argument for call to InternalGetCurrentThreadSlow.
p[i++] = 0xe8; // call InternalGetCurrentThreadSlow
*((DWORD*) &p[i]) = (DWORD)&InternalGetCurrentThreadSlow - (DWORD)(&p[i+sizeof(DWORD)]);
i += sizeof(DWORD);
#ifdef __APPLE__
p[i++] = 0x83; // addl $16,%esp
p[i++] = 0xc4;
p[i++] = 0x10;
#else
p[i++] = 0x83; // addl $8,%esp
p[i++] = 0xc4;
p[i++] = 0x08;
#endif
if (dwTlsIndex != THREAD_OBJECT_TLS_INDEX)
{
p[i++] = 0x8b; // mov offsetof(pThread->tlsSlots[dwTlsIndex])(%eax),%eax // %eax = pThread->tlsSlots[dwTlsIndex];
p[i++] = 0x80;
*((DWORD*) &p[i]) = (DWORD)(PAL_safe_offsetof(CPalThread,tlsInfo)+PAL_safe_offsetof(CThreadTLSInfo,tlsSlots[dwTlsIndex]));
i += sizeof(DWORD);
}
p[i++] = 0x5a; // pop %edx
p[i++] = 0x59; // pop %ecx
p[i++] = 0xc9; // leave
p[i++] = 0xc3; // ret
if (i > TLS_OPTIMIZED_GETTER_SIZE)
{
ASSERT("Invalid TLS_OPTIMIZED_GETTER_SIZE %d\n", i);
}
DBG_FlushInstructionCache(p, TLS_OPTIMIZED_GETTER_SIZE * sizeof(BYTE));
Ret = (PAL_POPTIMIZEDTLSGETTER)p;
return Ret;
#endif // BIT64 else
}
/*++
Function:
TLSFreeOptimizedGetter
Frees a function created by MakeOptimizedTlsGetter().
--*/
VOID
CorUnix::TLSFreeOptimizedGetter(
IN PAL_POPTIMIZEDTLSGETTER pOptimizedTlsGetter)
{
InternalFree(InternalGetCurrentThread(), (void *)pOptimizedTlsGetter);
}
#endif // USE_OPTIMIZEDTLSGETTER
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