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cgenamd64.cpp
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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.
//
// Various helper routines for generating AMD64 assembly code.
//
// Precompiled Header
#include "common.h"
#include "stublink.h"
#include "cgensys.h"
#include "siginfo.hpp"
#include "excep.h"
#include "ecall.h"
#include "dllimport.h"
#include "dllimportcallback.h"
#include "dbginterface.h"
#include "fcall.h"
#include "array.h"
#include "virtualcallstub.h"
#include "jitinterface.h"
#ifdef FEATURE_COMINTEROP
#include "clrtocomcall.h"
#endif // FEATURE_COMINTEROP
void UpdateRegDisplayFromCalleeSavedRegisters(REGDISPLAY * pRD, CalleeSavedRegisters * pRegs)
{
LIMITED_METHOD_CONTRACT;
T_CONTEXT * pContext = pRD->pCurrentContext;
#define CALLEE_SAVED_REGISTER(regname) pContext->regname = pRegs->regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
KNONVOLATILE_CONTEXT_POINTERS * pContextPointers = pRD->pCurrentContextPointers;
#define CALLEE_SAVED_REGISTER(regname) pContextPointers->regname = (PULONG64)&pRegs->regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
}
void ClearRegDisplayArgumentAndScratchRegisters(REGDISPLAY * pRD)
{
LIMITED_METHOD_CONTRACT;
KNONVOLATILE_CONTEXT_POINTERS * pContextPointers = pRD->pCurrentContextPointers;
pContextPointers->Rax = NULL;
#ifdef UNIX_AMD64_ABI
pContextPointers->Rsi = NULL;
pContextPointers->Rdi = NULL;
#endif
pContextPointers->Rcx = NULL;
pContextPointers->Rdx = NULL;
pContextPointers->R8 = NULL;
pContextPointers->R9 = NULL;
pContextPointers->R10 = NULL;
pContextPointers->R11 = NULL;
}
void TransitionFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
LIMITED_METHOD_CONTRACT;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
pRD->pCurrentContext->Rip = GetReturnAddress();
pRD->pCurrentContext->Rsp = GetSP();
UpdateRegDisplayFromCalleeSavedRegisters(pRD, GetCalleeSavedRegisters());
ClearRegDisplayArgumentAndScratchRegisters(pRD);
SyncRegDisplayToCurrentContext(pRD);
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK TransitionFrame::UpdateRegDisplay(rip:%p, rsp:%p)\n", pRD->ControlPC, pRD->SP));
}
#ifndef DACCESS_COMPILE
extern "C" TADDR s_pStubHelperFrameVPtr;
TADDR s_pStubHelperFrameVPtr = StubHelperFrame::GetMethodFrameVPtr();
void TailCallFrame::InitFromContext(T_CONTEXT * pContext)
{
WRAPPER_NO_CONTRACT;
#define CALLEE_SAVED_REGISTER(regname) m_calleeSavedRegisters.regname = pContext->regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
m_pGCLayout = 0;
m_ReturnAddress = pContext->Rip;
}
#endif // !DACCESS_COMPILE
void TailCallFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
LIMITED_METHOD_CONTRACT;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
pRD->pCurrentContext->Rip = m_ReturnAddress;
pRD->pCurrentContext->Rsp = dac_cast<TADDR>(this) + sizeof(*this);
UpdateRegDisplayFromCalleeSavedRegisters(pRD, &m_calleeSavedRegisters);
ClearRegDisplayArgumentAndScratchRegisters(pRD);
SyncRegDisplayToCurrentContext(pRD);
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK TransitionFrame::UpdateRegDisplay(rip:%p, rsp:%p)\n", pRD->ControlPC, pRD->SP));
}
void InlinedCallFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
#ifdef PROFILING_SUPPORTED
PRECONDITION(CORProfilerStackSnapshotEnabled() || InlinedCallFrame::FrameHasActiveCall(this));
#endif
HOST_NOCALLS;
MODE_ANY;
SUPPORTS_DAC;
}
CONTRACTL_END;
if (!InlinedCallFrame::FrameHasActiveCall(this))
{
LOG((LF_CORDB, LL_ERROR, "WARNING: InlinedCallFrame::UpdateRegDisplay called on inactive frame %p\n", this));
return;
}
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
pRD->pCurrentContext->Rip = *(DWORD64 *)&m_pCallerReturnAddress;
pRD->pCurrentContext->Rsp = *(DWORD64 *)&m_pCallSiteSP;
pRD->pCurrentContext->Rbp = *(DWORD64 *)&m_pCalleeSavedFP;
ClearRegDisplayArgumentAndScratchRegisters(pRD);
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContextPointers->regname = NULL;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
pRD->pCurrentContextPointers->Rbp = (DWORD64 *)&m_pCalleeSavedFP;
SyncRegDisplayToCurrentContext(pRD);
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK InlinedCallFrame::UpdateRegDisplay(rip:%p, rsp:%p)\n", pRD->ControlPC, pRD->SP));
}
void HelperMethodFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(m_MachState._pRetAddr == PTR_TADDR(&m_MachState.m_Rip));
SUPPORTS_DAC;
}
CONTRACTL_END;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
//
// Copy the saved state from the frame to the current context.
//
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK HelperMethodFrame::UpdateRegDisplay cached ip:%p, sp:%p\n", m_MachState.m_Rip, m_MachState.m_Rsp));
#if defined(DACCESS_COMPILE)
// For DAC, we may get here when the HMF is still uninitialized.
// So we may need to unwind here.
if (!m_MachState.isValid())
{
// This allocation throws on OOM.
MachState* pUnwoundState = (MachState*)DacAllocHostOnlyInstance(sizeof(*pUnwoundState), true);
InsureInit(false, pUnwoundState);
pRD->pCurrentContext->Rip = pRD->ControlPC = pUnwoundState->m_Rip;
pRD->pCurrentContext->Rsp = pRD->SP = pUnwoundState->m_Rsp;
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContext->regname = pUnwoundState->m_Capture.regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContextPointers->regname = pUnwoundState->m_Ptrs.p##regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
ClearRegDisplayArgumentAndScratchRegisters(pRD);
return;
}
#endif // DACCESS_COMPILE
pRD->pCurrentContext->Rip = pRD->ControlPC = m_MachState.m_Rip;
pRD->pCurrentContext->Rsp = pRD->SP = m_MachState.m_Rsp;
#ifdef FEATURE_PAL
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContext->regname = (m_MachState.m_Ptrs.p##regname != NULL) ? \
*m_MachState.m_Ptrs.p##regname : m_MachState.m_Unwound.regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
#else // FEATURE_PAL
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContext->regname = *m_MachState.m_Ptrs.p##regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
#endif // FEATURE_PAL
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContextPointers->regname = m_MachState.m_Ptrs.p##regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
//
// Clear all knowledge of scratch registers. We're skipping to any
// arbitrary point on the stack, and frames aren't required to preserve or
// keep track of these anyways.
//
ClearRegDisplayArgumentAndScratchRegisters(pRD);
}
void FaultingExceptionFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
LIMITED_METHOD_DAC_CONTRACT;
memcpy(pRD->pCurrentContext, &m_ctx, sizeof(CONTEXT));
pRD->ControlPC = m_ctx.Rip;
pRD->SP = m_ctx.Rsp;
pRD->pCurrentContextPointers->Rax = &m_ctx.Rax;
pRD->pCurrentContextPointers->Rcx = &m_ctx.Rcx;
pRD->pCurrentContextPointers->Rdx = &m_ctx.Rdx;
pRD->pCurrentContextPointers->Rbx = &m_ctx.Rbx;
pRD->pCurrentContextPointers->Rbp = &m_ctx.Rbp;
pRD->pCurrentContextPointers->Rsi = &m_ctx.Rsi;
pRD->pCurrentContextPointers->Rdi = &m_ctx.Rdi;
pRD->pCurrentContextPointers->R8 = &m_ctx.R8;
pRD->pCurrentContextPointers->R9 = &m_ctx.R9;
pRD->pCurrentContextPointers->R10 = &m_ctx.R10;
pRD->pCurrentContextPointers->R11 = &m_ctx.R11;
pRD->pCurrentContextPointers->R12 = &m_ctx.R12;
pRD->pCurrentContextPointers->R13 = &m_ctx.R13;
pRD->pCurrentContextPointers->R14 = &m_ctx.R14;
pRD->pCurrentContextPointers->R15 = &m_ctx.R15;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
}
#ifdef FEATURE_HIJACK
TADDR ResumableFrame::GetReturnAddressPtr()
{
LIMITED_METHOD_DAC_CONTRACT;
return dac_cast<TADDR>(m_Regs) + offsetof(CONTEXT, Rip);
}
void ResumableFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
CONTRACT_VOID
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
SUPPORTS_DAC;
}
CONTRACT_END;
CopyMemory(pRD->pCurrentContext, m_Regs, sizeof(CONTEXT));
pRD->ControlPC = m_Regs->Rip;
pRD->SP = m_Regs->Rsp;
pRD->pCurrentContextPointers->Rax = &m_Regs->Rax;
pRD->pCurrentContextPointers->Rcx = &m_Regs->Rcx;
pRD->pCurrentContextPointers->Rdx = &m_Regs->Rdx;
pRD->pCurrentContextPointers->Rbx = &m_Regs->Rbx;
pRD->pCurrentContextPointers->Rbp = &m_Regs->Rbp;
pRD->pCurrentContextPointers->Rsi = &m_Regs->Rsi;
pRD->pCurrentContextPointers->Rdi = &m_Regs->Rdi;
pRD->pCurrentContextPointers->R8 = &m_Regs->R8;
pRD->pCurrentContextPointers->R9 = &m_Regs->R9;
pRD->pCurrentContextPointers->R10 = &m_Regs->R10;
pRD->pCurrentContextPointers->R11 = &m_Regs->R11;
pRD->pCurrentContextPointers->R12 = &m_Regs->R12;
pRD->pCurrentContextPointers->R13 = &m_Regs->R13;
pRD->pCurrentContextPointers->R14 = &m_Regs->R14;
pRD->pCurrentContextPointers->R15 = &m_Regs->R15;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
RETURN;
}
// The HijackFrame has to know the registers that are pushed by OnHijackTripThread
void HijackFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
SUPPORTS_DAC;
}
CONTRACTL_END;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
pRD->pCurrentContext->Rip = m_ReturnAddress;
pRD->pCurrentContext->Rsp = PTR_TO_MEMBER_TADDR(HijackArgs, m_Args, Rip) + sizeof(void *);
UpdateRegDisplayFromCalleeSavedRegisters(pRD, &(m_Args->Regs));
#ifdef UNIX_AMD64_ABI
pRD->pCurrentContextPointers->Rsi = NULL;
pRD->pCurrentContextPointers->Rdi = NULL;
#endif
pRD->pCurrentContextPointers->Rcx = NULL;
#ifdef FEATURE_UNIX_AMD64_STRUCT_PASSING
pRD->pCurrentContextPointers->Rdx = (PULONG64)&m_Args->Rdx;
#else // FEATURE_UNIX_AMD64_STRUCT_PASSING
pRD->pCurrentContextPointers->Rdx = NULL;
#endif // FEATURE_UNIX_AMD64_STRUCT_PASSING
pRD->pCurrentContextPointers->R8 = NULL;
pRD->pCurrentContextPointers->R9 = NULL;
pRD->pCurrentContextPointers->R10 = NULL;
pRD->pCurrentContextPointers->R11 = NULL;
pRD->pCurrentContextPointers->Rax = (PULONG64)&m_Args->Rax;
SyncRegDisplayToCurrentContext(pRD);
/*
// This only describes the top-most frame
pRD->pContext = NULL;
pRD->PCTAddr = dac_cast<TADDR>(m_Args) + offsetof(HijackArgs, Rip);
//pRD->pPC = PTR_SLOT(pRD->PCTAddr);
pRD->SP = (ULONG64)(pRD->PCTAddr + sizeof(TADDR));
*/
}
#endif // FEATURE_HIJACK
BOOL isJumpRel32(PCODE pCode)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
SUPPORTS_DAC;
} CONTRACTL_END;
PTR_BYTE pbCode = PTR_BYTE(pCode);
return 0xE9 == pbCode[0];
}
//
// Given the same pBuffer that was used by emitJump this
// method decodes the instructions and returns the jump target
//
PCODE decodeJump32(PCODE pBuffer)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
SUPPORTS_DAC;
}
CONTRACTL_END;
// jmp rel32
_ASSERTE(isJumpRel32(pBuffer));
return rel32Decode(pBuffer+1);
}
BOOL isJumpRel64(PCODE pCode)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
SUPPORTS_DAC;
} CONTRACTL_END;
PTR_BYTE pbCode = PTR_BYTE(pCode);
return 0x48 == pbCode[0] &&
0xB8 == pbCode[1] &&
0xFF == pbCode[10] &&
0xE0 == pbCode[11];
}
PCODE decodeJump64(PCODE pBuffer)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
SUPPORTS_DAC;
}
CONTRACTL_END;
// mov rax, xxx
// jmp rax
_ASSERTE(isJumpRel64(pBuffer));
return *PTR_UINT64(pBuffer+2);
}
#ifdef DACCESS_COMPILE
BOOL GetAnyThunkTarget (CONTEXT *pctx, TADDR *pTarget, TADDR *pTargetMethodDesc)
{
TADDR pThunk = GetIP(pctx);
*pTargetMethodDesc = NULL;
//
// Check for something generated by emitJump.
//
if (isJumpRel64(pThunk))
{
*pTarget = decodeJump64(pThunk);
return TRUE;
}
return FALSE;
}
#endif // DACCESS_COMPILE
#ifndef DACCESS_COMPILE
// Note: This is only used on server GC on Windows.
//
// This function returns the number of logical processors on a given physical chip. If it cannot
// determine the number of logical cpus, or the machine is not populated uniformly with the same
// type of processors, this function returns 1.
extern "C" DWORD __stdcall getcpuid(DWORD arg, unsigned char result[16]);
// fix this if/when AMD does multicore or SMT
DWORD GetLogicalCpuCount()
{
// No CONTRACT possible because GetLogicalCpuCount uses SEH
STATIC_CONTRACT_THROWS;
STATIC_CONTRACT_GC_NOTRIGGER;
static DWORD val = 0;
// cache value for later re-use
if (val)
{
return val;
}
struct Param : DefaultCatchFilterParam
{
DWORD retVal;
} param;
param.pv = COMPLUS_EXCEPTION_EXECUTE_HANDLER;
param.retVal = 1;
PAL_TRY(Param *, pParam, ¶m)
{
unsigned char buffer[16];
DWORD maxCpuId = getcpuid(0, buffer);
DWORD* dwBuffer = (DWORD*)buffer;
if (maxCpuId < 1)
goto qExit;
if (dwBuffer[1] == 'uneG') {
if (dwBuffer[3] == 'Ieni') {
if (dwBuffer[2] == 'letn') { // get SMT/multicore enumeration for Intel EM64T
// TODO: Currently GetLogicalCpuCountFromOS() and GetLogicalCpuCountFallback() are broken on
// multi-core processor, but we never call into those two functions since we don't halve the
// gen0size when it's prescott and above processor. We keep the old version here for earlier
// generation system(Northwood based), perf data suggests on those systems, halve gen0 size
// still boost the performance(ex:Biztalk boosts about 17%). So on earlier systems(Northwood)
// based, we still go ahead and halve gen0 size. The logic in GetLogicalCpuCountFromOS()
// and GetLogicalCpuCountFallback() works fine for those earlier generation systems.
// If it's a Prescott and above processor or Multi-core, perf data suggests not to halve gen0
// size at all gives us overall better performance.
// This is going to be fixed with a new version in orcas time frame.
if( (maxCpuId > 3) && (maxCpuId < 0x80000000) )
goto qExit;
val = GetLogicalCpuCountFromOS(); //try to obtain HT enumeration from OS API
if (val )
{
pParam->retVal = val; // OS API HT enumeration successful, we are Done
goto qExit;
}
val = GetLogicalCpuCountFallback(); // Fallback to HT enumeration using CPUID
if( val )
pParam->retVal = val;
}
}
}
qExit: ;
}
PAL_EXCEPT_FILTER(DefaultCatchFilter)
{
}
PAL_ENDTRY
if (val == 0)
{
val = param.retVal;
}
return param.retVal;
}
void EncodeLoadAndJumpThunk (LPBYTE pBuffer, LPVOID pv, LPVOID pTarget)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(pBuffer));
}
CONTRACTL_END;
// mov r10, pv 49 ba xx xx xx xx xx xx xx xx
pBuffer[0] = 0x49;
pBuffer[1] = 0xBA;
*((UINT64 UNALIGNED *)&pBuffer[2]) = (UINT64)pv;
// mov rax, pTarget 48 b8 xx xx xx xx xx xx xx xx
pBuffer[10] = 0x48;
pBuffer[11] = 0xB8;
*((UINT64 UNALIGNED *)&pBuffer[12]) = (UINT64)pTarget;
// jmp rax ff e0
pBuffer[20] = 0xFF;
pBuffer[21] = 0xE0;
_ASSERTE(DbgIsExecutable(pBuffer, 22));
}
void emitCOMStubCall (ComCallMethodDesc *pCOMMethod, PCODE target)
{
CONTRACT_VOID
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACT_END;
BYTE *pBuffer = (BYTE*)pCOMMethod - COMMETHOD_CALL_PRESTUB_SIZE;
// We need the target to be in a 64-bit aligned memory location and the call instruction
// to immediately precede the ComCallMethodDesc. We'll generate an indirect call to avoid
// consuming 3 qwords for this (mov rax, | target | nops & call rax).
// dq 123456789abcdef0h
// nop 90
// nop 90
// call [$ - 10] ff 15 f0 ff ff ff
*((UINT64 *)&pBuffer[COMMETHOD_CALL_PRESTUB_ADDRESS_OFFSET]) = (UINT64)target;
pBuffer[-2] = 0x90;
pBuffer[-1] = 0x90;
pBuffer[0] = 0xFF;
pBuffer[1] = 0x15;
*((UINT32 UNALIGNED *)&pBuffer[2]) = (UINT32)(COMMETHOD_CALL_PRESTUB_ADDRESS_OFFSET - COMMETHOD_CALL_PRESTUB_SIZE);
_ASSERTE(DbgIsExecutable(pBuffer, COMMETHOD_CALL_PRESTUB_SIZE));
RETURN;
}
void emitJump(LPBYTE pBuffer, LPVOID target)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(pBuffer));
}
CONTRACTL_END;
// mov rax, 123456789abcdef0h 48 b8 xx xx xx xx xx xx xx xx
// jmp rax ff e0
pBuffer[0] = 0x48;
pBuffer[1] = 0xB8;
*((UINT64 UNALIGNED *)&pBuffer[2]) = (UINT64)target;
pBuffer[10] = 0xFF;
pBuffer[11] = 0xE0;
_ASSERTE(DbgIsExecutable(pBuffer, 12));
}
void UMEntryThunkCode::Encode(BYTE* pTargetCode, void* pvSecretParam)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
// padding // CC CC CC CC
// mov r10, pUMEntryThunk // 49 ba xx xx xx xx xx xx xx xx // METHODDESC_REGISTER
// mov rax, pJmpDest // 48 b8 xx xx xx xx xx xx xx xx // need to ensure this imm64 is qword aligned
// TAILJMP_RAX // 48 FF E0
#ifdef _DEBUG
m_padding[0] = X86_INSTR_INT3;
m_padding[1] = X86_INSTR_INT3;
m_padding[2] = X86_INSTR_INT3;
m_padding[3] = X86_INSTR_INT3;
#endif // _DEBUG
m_movR10[0] = REX_PREFIX_BASE | REX_OPERAND_SIZE_64BIT | REX_OPCODE_REG_EXT;
m_movR10[1] = 0xBA;
m_uet = pvSecretParam;
m_movRAX[0] = REX_PREFIX_BASE | REX_OPERAND_SIZE_64BIT;
m_movRAX[1] = 0xB8;
m_execstub = pTargetCode;
m_jmpRAX[0] = REX_PREFIX_BASE | REX_OPERAND_SIZE_64BIT;
m_jmpRAX[1] = 0xFF;
m_jmpRAX[2] = 0xE0;
_ASSERTE(DbgIsExecutable(&m_movR10[0], &m_jmpRAX[3]-&m_movR10[0]));
}
void UMEntryThunkCode::Poison()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
m_execstub = (BYTE *)UMEntryThunk::ReportViolation;
m_movR10[0] = REX_PREFIX_BASE | REX_OPERAND_SIZE_64BIT;
#ifdef _WIN32
// mov rcx, pUMEntryThunk // 48 b9 xx xx xx xx xx xx xx xx
m_movR10[1] = 0xB9;
#else
// mov rdi, pUMEntryThunk // 48 bf xx xx xx xx xx xx xx xx
m_movR10[1] = 0xBF;
#endif
ClrFlushInstructionCache(&m_movR10[0], &m_jmpRAX[3]-&m_movR10[0]);
}
UMEntryThunk* UMEntryThunk::Decode(LPVOID pCallback)
{
LIMITED_METHOD_CONTRACT;
UMEntryThunkCode *pThunkCode = (UMEntryThunkCode*)((BYTE*)pCallback - UMEntryThunkCode::GetEntryPointOffset());
return (UMEntryThunk*)pThunkCode->m_uet;
}
INT32 rel32UsingJumpStub(INT32 UNALIGNED * pRel32, PCODE target, MethodDesc *pMethod,
LoaderAllocator *pLoaderAllocator /* = NULL */, bool throwOnOutOfMemoryWithinRange /*= true*/)
{
CONTRACTL
{
THROWS; // Creating a JumpStub could throw OutOfMemory
GC_NOTRIGGER;
PRECONDITION(pMethod != NULL || pLoaderAllocator != NULL);
// If a loader allocator isn't explicitly provided, we must be able to get one via the MethodDesc.
PRECONDITION(pLoaderAllocator != NULL || pMethod->GetLoaderAllocator() != NULL);
// If a domain is provided, the MethodDesc mustn't yet be set up to have one, or it must match the MethodDesc's domain,
// unless we're in a compilation domain (NGen loads assemblies as domain-bound but compiles them as domain neutral).
PRECONDITION(!pLoaderAllocator || !pMethod || pMethod->GetMethodDescChunk()->GetMethodTablePtr()->IsNull() ||
pLoaderAllocator == pMethod->GetMethodDescChunk()->GetFirstMethodDesc()->GetLoaderAllocatorForCode() || IsCompilationProcess());
}
CONTRACTL_END;
TADDR baseAddr = (TADDR)pRel32 + 4;
INT_PTR offset = target - baseAddr;
if (!FitsInI4(offset) INDEBUG(|| PEDecoder::GetForceRelocs()))
{
TADDR loAddr = baseAddr + INT32_MIN;
if (loAddr > baseAddr) loAddr = UINT64_MIN; // overflow
TADDR hiAddr = baseAddr + INT32_MAX;
if (hiAddr < baseAddr) hiAddr = UINT64_MAX; // overflow
// Always try to allocate with throwOnOutOfMemoryWithinRange:false first to conserve reserveForJumpStubs until when
// it is really needed. LoaderCodeHeap::CreateCodeHeap and EEJitManager::CanUseCodeHeap won't use the reserved
// space when throwOnOutOfMemoryWithinRange is false.
//
// The reserved space should be only used by jump stubs for precodes and other similar code fragments. It should
// not be used by JITed code. And since the accounting of the reserved space is not precise, we are conservative
// and try to save the reserved space until it is really needed to avoid throwing out of memory within range exception.
PCODE jumpStubAddr = ExecutionManager::jumpStub(pMethod,
target,
(BYTE *)loAddr,
(BYTE *)hiAddr,
pLoaderAllocator,
/* throwOnOutOfMemoryWithinRange */ false);
if (jumpStubAddr == NULL)
{
if (!throwOnOutOfMemoryWithinRange)
return 0;
jumpStubAddr = ExecutionManager::jumpStub(pMethod,
target,
(BYTE *)loAddr,
(BYTE *)hiAddr,
pLoaderAllocator,
/* throwOnOutOfMemoryWithinRange */ true);
}
offset = jumpStubAddr - baseAddr;
if (!FitsInI4(offset))
{
_ASSERTE(!"jump stub was not in expected range");
EEPOLICY_HANDLE_FATAL_ERROR(COR_E_EXECUTIONENGINE);
}
}
_ASSERTE(FitsInI4(offset));
return static_cast<INT32>(offset);
}
INT32 rel32UsingPreallocatedJumpStub(INT32 UNALIGNED * pRel32, PCODE target, PCODE jumpStubAddr)
{
CONTRACTL
{
THROWS; // emitBackToBackJump may throw (see emitJump)
GC_NOTRIGGER;
}
CONTRACTL_END;
TADDR baseAddr = (TADDR)pRel32 + 4;
_ASSERTE(FitsInI4(jumpStubAddr - baseAddr));
INT_PTR offset = target - baseAddr;
if (!FitsInI4(offset) INDEBUG(|| PEDecoder::GetForceRelocs()))
{
offset = jumpStubAddr - baseAddr;
if (!FitsInI4(offset))
{
_ASSERTE(!"jump stub was not in expected range");
EEPOLICY_HANDLE_FATAL_ERROR(COR_E_EXECUTIONENGINE);
}
emitBackToBackJump((LPBYTE)jumpStubAddr, (LPVOID)target);
}
_ASSERTE(FitsInI4(offset));
return static_cast<INT32>(offset);
}
BOOL DoesSlotCallPrestub(PCODE pCode)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
PRECONDITION(pCode != GetPreStubEntryPoint());
} CONTRACTL_END;
// AMD64 has the following possible sequences for prestub logic:
// 1. slot -> temporary entrypoint -> prestub
// 2. slot -> precode -> prestub
// 3. slot -> precode -> jumprel64 (jump stub) -> prestub
// 4. slot -> precode -> jumprel64 (NGEN case) -> prestub
#ifdef HAS_COMPACT_ENTRYPOINTS
if (MethodDescChunk::GetMethodDescFromCompactEntryPoint(pCode, TRUE) != NULL)
{
return TRUE;
}
#endif
if (!IS_ALIGNED(pCode, PRECODE_ALIGNMENT))
{
return FALSE;
}
#ifdef HAS_FIXUP_PRECODE
if (*PTR_BYTE(pCode) == X86_INSTR_CALL_REL32)
{
// Note that call could have been patched to jmp in the meantime
pCode = rel32Decode(pCode+1);
#ifdef FEATURE_PREJIT
// NGEN helper
if (*PTR_BYTE(pCode) == X86_INSTR_JMP_REL32) {
pCode = (TADDR)rel32Decode(pCode+1);
}
#endif
// JumpStub
if (isJumpRel64(pCode)) {
pCode = decodeJump64(pCode);
}
return pCode == (TADDR)PrecodeFixupThunk;
}
#endif
if (*PTR_USHORT(pCode) != X86_INSTR_MOV_R10_IMM64 || // mov rax,XXXX
*PTR_BYTE(pCode+10) != X86_INSTR_NOP || // nop
*PTR_BYTE(pCode+11) != X86_INSTR_JMP_REL32) // jmp rel32
{
return FALSE;
}
pCode = rel32Decode(pCode+12);
#ifdef FEATURE_PREJIT
// NGEN helper
if (*PTR_BYTE(pCode) == X86_INSTR_JMP_REL32) {
pCode = (TADDR)rel32Decode(pCode+1);
}
#endif
// JumpStub
if (isJumpRel64(pCode)) {
pCode = decodeJump64(pCode);
}
return pCode == GetPreStubEntryPoint();
}
//
// Some AMD64 assembly functions have one or more DWORDS at the end of the function
// that specify the offsets where significant instructions are
// we use this function to get at these offsets
//
DWORD GetOffsetAtEndOfFunction(ULONGLONG uImageBase,
PT_RUNTIME_FUNCTION pFunctionEntry,
int offsetNum /* = 1*/)
{
CONTRACTL
{
MODE_ANY;
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
PRECONDITION((offsetNum > 0) && (offsetNum < 20)); /* we only allow reasonable offsetNums 1..19 */
}
CONTRACTL_END;
DWORD functionSize = pFunctionEntry->EndAddress - pFunctionEntry->BeginAddress;
BYTE* pEndOfFunction = (BYTE*) (uImageBase + pFunctionEntry->EndAddress);
DWORD* pOffset = (DWORD*) (pEndOfFunction) - offsetNum;
DWORD offsetInFunc = *pOffset;
_ASSERTE_ALL_BUILDS("clr/src/VM/AMD64/cGenAMD64.cpp", (offsetInFunc >= 0) && (offsetInFunc < functionSize));
return offsetInFunc;
}
//==========================================================================================
// In NGen image, virtual slots inherited from cross-module dependencies point to jump thunks.
// These jump thunk initially point to VirtualMethodFixupStub which transfers control here.
// This method 'VirtualMethodFixupWorker' will patch the jump thunk to point to the actual
// inherited method body after we have execute the precode and a stable entry point.
//
EXTERN_C PCODE VirtualMethodFixupWorker(TransitionBlock * pTransitionBlock, CORCOMPILE_VIRTUAL_IMPORT_THUNK * pThunk)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS; // GC not allowed until we call pEMFrame->SetFunction(pMD);
ENTRY_POINT;
}
CONTRACTL_END;
MAKE_CURRENT_THREAD_AVAILABLE();
PCODE pCode = NULL;
MethodDesc * pMD = NULL;
#ifdef _DEBUG
Thread::ObjectRefFlush(CURRENT_THREAD);
#endif
BEGIN_SO_INTOLERANT_CODE(CURRENT_THREAD);
_ASSERTE(IS_ALIGNED((size_t)pThunk, sizeof(INT64)));
FrameWithCookie<ExternalMethodFrame> frame(pTransitionBlock);
ExternalMethodFrame * pEMFrame = &frame;
OBJECTREF pThisPtr = pEMFrame->GetThis();
_ASSERTE(pThisPtr != NULL);
VALIDATEOBJECT(pThisPtr);
MethodTable * pMT = pThisPtr->GetTrueMethodTable();
WORD slotNumber = pThunk->slotNum;
_ASSERTE(slotNumber != (WORD)-1);
pCode = pMT->GetRestoredSlot(slotNumber);
if (!DoesSlotCallPrestub(pCode))
{
pMD = MethodTable::GetMethodDescForSlotAddress(pCode);
pEMFrame->SetFunction(pMD); // We will use the pMD to enumerate the GC refs in the arguments
pEMFrame->Push(CURRENT_THREAD);
INSTALL_MANAGED_EXCEPTION_DISPATCHER;
INSTALL_UNWIND_AND_CONTINUE_HANDLER_NO_PROBE;
// Skip fixup precode jump for better perf
PCODE pDirectTarget = Precode::TryToSkipFixupPrecode(pCode);
if (pDirectTarget != NULL)
pCode = pDirectTarget;
INT64 oldValue = *(INT64*)pThunk;
BYTE* pOldValue = (BYTE*)&oldValue;
if (pOldValue[0] == X86_INSTR_CALL_REL32)
{
INT64 newValue = oldValue;
BYTE* pNewValue = (BYTE*)&newValue;
pNewValue[0] = X86_INSTR_JMP_REL32;
*(INT32 *)(pNewValue+1) = rel32UsingJumpStub((INT32*)(&pThunk->callJmp[1]), pCode, pMD, NULL);
_ASSERTE(IS_ALIGNED(pThunk, sizeof(INT64)));
EnsureWritableExecutablePages(pThunk, sizeof(INT64));
FastInterlockCompareExchangeLong((INT64*)pThunk, newValue, oldValue);
FlushInstructionCache(GetCurrentProcess(), pThunk, 8);
}
UNINSTALL_UNWIND_AND_CONTINUE_HANDLER_NO_PROBE;
UNINSTALL_MANAGED_EXCEPTION_DISPATCHER;
pEMFrame->Pop(CURRENT_THREAD);
}
// Ready to return
END_SO_INTOLERANT_CODE;
return pCode;
}
#ifdef FEATURE_READYTORUN
//
// Allocation of dynamic helpers
//
#define DYNAMIC_HELPER_ALIGNMENT sizeof(TADDR)