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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.
//
// 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_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
LIMITED_METHOD_CONTRACT;
#ifndef DACCESS_COMPILE
if (updateFloats)
{
UpdateFloatingPointRegisters(pRD);
_ASSERTE(pRD->pCurrentContext->Rip == GetReturnAddress());
}
#endif // DACCESS_COMPILE
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_Impl(rip:%p, rsp:%p)\n", pRD->ControlPC, pRD->SP));
}
void InlinedCallFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
#ifdef PROFILING_SUPPORTED
PRECONDITION(CORProfilerStackSnapshotEnabled() || InlinedCallFrame::FrameHasActiveCall(this));
#endif
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;
}
#ifndef DACCESS_COMPILE
if (updateFloats)
{
UpdateFloatingPointRegisters(pRD);
// The float updating unwinds the stack so the pRD->pCurrentContext->Rip contains correct unwound Rip
// This is used for exception handling and the Rip extracted from m_pCallerReturnAddress is slightly
// off, which causes problem with searching for the return address on shadow stack on x64, so
// we keep the value from the unwind.
}
else
#endif // DACCESS_COMPILE
{
pRD->pCurrentContext->Rip = *(DWORD64 *)&m_pCallerReturnAddress;
}
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
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_Impl(rip:%p, rsp:%p)\n", pRD->ControlPC, pRD->SP));
}
void HelperMethodFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(m_MachState._pRetAddr == PTR_TADDR(&m_MachState.m_Rip));
SUPPORTS_DAC;
}
CONTRACTL_END;
#ifndef DACCESS_COMPILE
if (updateFloats)
{
UpdateFloatingPointRegisters(pRD);
_ASSERTE(pRD->pCurrentContext->Rip == m_MachState.m_Rip);
}
#endif // DACCESS_COMPILE
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);
EnsureInit(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 = &pRD->pCurrentContext->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 TARGET_UNIX
#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 // TARGET_UNIX
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContext->regname = *m_MachState.m_Ptrs.p##regname;
ENUM_CALLEE_SAVED_REGISTERS();
#undef CALLEE_SAVED_REGISTER
#endif // TARGET_UNIX
#define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContextPointers->regname = (DWORD64 *)(TADDR *)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_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
LIMITED_METHOD_DAC_CONTRACT;
memcpy(pRD->pCurrentContext, &m_ctx, sizeof(CONTEXT));
// Clear the CONTEXT_XSTATE, since the REGDISPLAY contains just plain CONTEXT structure
// that cannot contain any extended state.
pRD->pCurrentContext->ContextFlags &= ~(CONTEXT_XSTATE & CONTEXT_AREA_MASK);
pRD->ControlPC = m_ctx.Rip;
pRD->SP = m_ctx.Rsp;
#ifdef TARGET_WINDOWS
pRD->SSP = m_SSP;
#endif
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_Impl()
{
LIMITED_METHOD_DAC_CONTRACT;
return dac_cast<TADDR>(m_Regs) + offsetof(CONTEXT, Rip);
}
void ResumableFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
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_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
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;
#ifdef TARGET_WINDOWS
pRD->pCurrentContext->Rsp = m_Args->Rsp;
#else
pRD->pCurrentContext->Rsp = PTR_TO_MEMBER_TADDR(HijackArgs, m_Args, Rip) + sizeof(void *);
#endif
UpdateRegDisplayFromCalleeSavedRegisters(pRD, &(m_Args->Regs));
#ifdef UNIX_AMD64_ABI
pRD->pCurrentContextPointers->Rsi = NULL;
pRD->pCurrentContextPointers->Rdi = NULL;
#endif
pRD->pCurrentContextPointers->Rcx = NULL;
#ifdef UNIX_AMD64_ABI
pRD->pCurrentContextPointers->Rdx = (PULONG64)&m_Args->Rdx;
#else // UNIX_AMD64_ABI
pRD->pCurrentContextPointers->Rdx = NULL;
#endif // UNIX_AMD64_ABI
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;
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;
SUPPORTS_DAC;
}
CONTRACTL_END;
// jmp rel32
_ASSERTE(isJumpRel32(pBuffer));
return rel32Decode(pBuffer+1);
}
BOOL isJumpRel64(PCODE pCode)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
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;
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 = (TADDR)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.
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 *pCOMMethodRX, ComCallMethodDesc *pCOMMethodRW, PCODE target)
{
CONTRACT_VOID
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACT_END;
BYTE *pBufferRX = (BYTE*)pCOMMethodRX - COMMETHOD_CALL_PRESTUB_SIZE;
BYTE *pBufferRW = (BYTE*)pCOMMethodRW - 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 *)&pBufferRW[COMMETHOD_CALL_PRESTUB_ADDRESS_OFFSET]) = (UINT64)target;
pBufferRW[-2] = 0x90;
pBufferRW[-1] = 0x90;
pBufferRW[0] = 0xFF;
pBufferRW[1] = 0x15;
*((UINT32 UNALIGNED *)&pBufferRW[2]) = (UINT32)(COMMETHOD_CALL_PRESTUB_ADDRESS_OFFSET - COMMETHOD_CALL_PRESTUB_SIZE);
_ASSERTE(DbgIsExecutable(pBufferRX, COMMETHOD_CALL_PRESTUB_SIZE));
RETURN;
}
void emitJump(LPBYTE pBufferRX, LPBYTE pBufferRW, LPVOID target)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(pBufferRX));
}
CONTRACTL_END;
// mov rax, 123456789abcdef0h 48 b8 xx xx xx xx xx xx xx xx
// jmp rax ff e0
pBufferRW[0] = 0x48;
pBufferRW[1] = 0xB8;
*((UINT64 UNALIGNED *)&pBufferRW[2]) = (UINT64)target;
pBufferRW[10] = 0xFF;
pBufferRW[11] = 0xE0;
_ASSERTE(DbgIsExecutable(pBufferRX, 12));
}
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()->GetMethodTable() == NULL ||
pLoaderAllocator == pMethod->GetMethodDescChunk()->GetFirstMethodDesc()->GetLoaderAllocator());
}
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 == (PCODE)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 jumpStubAddrRX, PCODE jumpStubAddrRW, bool emitJump)
{
CONTRACTL
{
THROWS; // emitBackToBackJump may throw (see emitJump)
GC_NOTRIGGER;
}
CONTRACTL_END;
TADDR baseAddr = (TADDR)pRel32 + 4;
_ASSERTE(FitsInI4(jumpStubAddrRX - baseAddr));
INT_PTR offset = target - baseAddr;
if (!FitsInI4(offset) INDEBUG(|| PEDecoder::GetForceRelocs()))
{
offset = jumpStubAddrRX - baseAddr;
if (!FitsInI4(offset))
{
_ASSERTE(!"jump stub was not in expected range");
EEPOLICY_HANDLE_FATAL_ERROR(COR_E_EXECUTIONENGINE);
}
if (emitJump)
{
emitBackToBackJump((LPBYTE)jumpStubAddrRX, (LPBYTE)jumpStubAddrRW, (LPVOID)target);
}
else
{
_ASSERTE(decodeBackToBackJump(jumpStubAddrRX) == target);
}
}
_ASSERTE(FitsInI4(offset));
return static_cast<INT32>(offset);
}
//
// 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;
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((offsetInFunc >= 0) && (offsetInFunc < functionSize));
return offsetInFunc;
}
#ifdef FEATURE_READYTORUN
//
// Allocation of dynamic helpers
//
#ifndef FEATURE_STUBPRECODE_DYNAMIC_HELPERS
#define DYNAMIC_HELPER_ALIGNMENT sizeof(TADDR)
#define BEGIN_DYNAMIC_HELPER_EMIT_WORKER(size) \
SIZE_T cb = size; \
SIZE_T cbAligned = ALIGN_UP(cb, DYNAMIC_HELPER_ALIGNMENT); \
BYTE * pStartRX = (BYTE *)(void*)pAllocator->GetDynamicHelpersHeap()->AllocAlignedMem(cbAligned, DYNAMIC_HELPER_ALIGNMENT); \
ExecutableWriterHolder<BYTE> startWriterHolder(pStartRX, cbAligned); \
BYTE * pStart = startWriterHolder.GetRW(); \
size_t rxOffset = pStartRX - pStart; \
BYTE * p = pStart;
#ifdef FEATURE_PERFMAP
#define BEGIN_DYNAMIC_HELPER_EMIT(size) \
BEGIN_DYNAMIC_HELPER_EMIT_WORKER(size) \
PerfMap::LogStubs(__FUNCTION__, "DynamicHelper", (PCODE)p, size, PerfMapStubType::Individual);
#else
#define BEGIN_DYNAMIC_HELPER_EMIT(size) BEGIN_DYNAMIC_HELPER_EMIT_WORKER(size)
#endif
#define END_DYNAMIC_HELPER_EMIT() \
_ASSERTE(pStart + cb == p); \
while (p < pStart + cbAligned) *p++ = X86_INSTR_INT3; \
ClrFlushInstructionCache(pStartRX, cbAligned); \
return (PCODE)pStartRX
PCODE DynamicHelpers::CreateHelper(LoaderAllocator * pAllocator, TADDR arg, PCODE target)
{
STANDARD_VM_CONTRACT;
BEGIN_DYNAMIC_HELPER_EMIT(15);
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBF48; // mov rdi, XXXXXX
#else
*(UINT16 *)p = 0xB948; // mov rcx, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg;
p += 8;
*p++ = X86_INSTR_JMP_REL32; // jmp rel32
*(INT32 *)p = rel32UsingJumpStub((INT32 *)(p + rxOffset), target, NULL, pAllocator);
p += 4;
END_DYNAMIC_HELPER_EMIT();
}
void DynamicHelpers::EmitHelperWithArg(BYTE*& p, size_t rxOffset, LoaderAllocator * pAllocator, TADDR arg, PCODE target)
{
CONTRACTL
{
GC_NOTRIGGER;
PRECONDITION(p != NULL && target != NULL);
}
CONTRACTL_END;
// Move an argument into the second argument register and jump to a target function.
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBE48; // mov rsi, XXXXXX
#else
*(UINT16 *)p = 0xBA48; // mov rdx, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg;
p += 8;
*p++ = X86_INSTR_JMP_REL32; // jmp rel32
*(INT32 *)p = rel32UsingJumpStub((INT32 *)(p + rxOffset), target, NULL, pAllocator);
p += 4;
}
PCODE DynamicHelpers::CreateHelperWithArg(LoaderAllocator * pAllocator, TADDR arg, PCODE target)
{
BEGIN_DYNAMIC_HELPER_EMIT(15);
EmitHelperWithArg(p, rxOffset, pAllocator, arg, target);
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateHelper(LoaderAllocator * pAllocator, TADDR arg, TADDR arg2, PCODE target)
{
BEGIN_DYNAMIC_HELPER_EMIT(25);
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBF48; // mov rdi, XXXXXX
#else
*(UINT16 *)p = 0xB948; // mov rcx, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg;
p += 8;
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBE48; // mov rsi, XXXXXX
#else
*(UINT16 *)p = 0xBA48; // mov rdx, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg2;
p += 8;
*p++ = X86_INSTR_JMP_REL32; // jmp rel32
*(INT32 *)p = rel32UsingJumpStub((INT32 *)(p + rxOffset), target, NULL, pAllocator);
p += 4;
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateHelperArgMove(LoaderAllocator * pAllocator, TADDR arg, PCODE target)
{
BEGIN_DYNAMIC_HELPER_EMIT(18);
#ifdef UNIX_AMD64_ABI
*p++ = 0x48; // mov rsi, rdi
*(UINT16 *)p = 0xF78B;
#else
*p++ = 0x48; // mov rdx, rcx
*(UINT16 *)p = 0xD18B;
#endif
p += 2;
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBF48; // mov rdi, XXXXXX
#else
*(UINT16 *)p = 0xB948; // mov rcx, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg;
p += 8;
*p++ = X86_INSTR_JMP_REL32; // jmp rel32
*(INT32 *)p = rel32UsingJumpStub((INT32 *)(p + rxOffset), target, NULL, pAllocator);
p += 4;
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateReturn(LoaderAllocator * pAllocator)
{
BEGIN_DYNAMIC_HELPER_EMIT(1);
*p++ = 0xC3; // ret
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateReturnConst(LoaderAllocator * pAllocator, TADDR arg)
{
BEGIN_DYNAMIC_HELPER_EMIT(11);
*(UINT16 *)p = 0xB848; // mov rax, XXXXXX
p += 2;
*(TADDR *)p = arg;
p += 8;
*p++ = 0xC3; // ret
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateReturnIndirConst(LoaderAllocator * pAllocator, TADDR arg, INT8 offset)
{
BEGIN_DYNAMIC_HELPER_EMIT((offset != 0) ? 15 : 11);
*(UINT16 *)p = 0xA148; // mov rax, [XXXXXX]
p += 2;
*(TADDR *)p = arg;
p += 8;
if (offset != 0)
{
// add rax, <offset>
*p++ = 0x48;
*p++ = 0x83;
*p++ = 0xC0;
*p++ = offset;
}
*p++ = 0xC3; // ret
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateHelperWithTwoArgs(LoaderAllocator * pAllocator, TADDR arg, PCODE target)
{
BEGIN_DYNAMIC_HELPER_EMIT(15);
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBA48; // mov rdx, XXXXXX
#else
*(UINT16 *)p = 0xB849; // mov r8, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg;
p += 8;
*p++ = X86_INSTR_JMP_REL32; // jmp rel32
*(INT32 *)p = rel32UsingJumpStub((INT32 *)(p + rxOffset), target, NULL, pAllocator);
p += 4;
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateHelperWithTwoArgs(LoaderAllocator * pAllocator, TADDR arg, TADDR arg2, PCODE target)
{
BEGIN_DYNAMIC_HELPER_EMIT(25);
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xBA48; // mov rdx, XXXXXX
#else
*(UINT16 *)p = 0xB849; // mov r8, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg;
p += 8;
#ifdef UNIX_AMD64_ABI
*(UINT16 *)p = 0xB948; // mov rcx, XXXXXX
#else
*(UINT16 *)p = 0xB949; // mov r9, XXXXXX
#endif
p += 2;
*(TADDR *)p = arg2;
p += 8;
*p++ = X86_INSTR_JMP_REL32; // jmp rel32
*(INT32 *)p = rel32UsingJumpStub((INT32 *)(p + rxOffset), target, NULL, pAllocator);
p += 4;
END_DYNAMIC_HELPER_EMIT();
}
PCODE DynamicHelpers::CreateDictionaryLookupHelper(LoaderAllocator * pAllocator, CORINFO_RUNTIME_LOOKUP * pLookup, DWORD dictionaryIndexAndSlot, Module * pModule)
{
STANDARD_VM_CONTRACT;
PCODE helperAddress = GetDictionaryLookupHelper(pLookup->helper);
GenericHandleArgs * pArgs = (GenericHandleArgs *)(void *)pAllocator->GetDynamicHelpersHeap()->AllocAlignedMem(sizeof(GenericHandleArgs), DYNAMIC_HELPER_ALIGNMENT);
ExecutableWriterHolder<GenericHandleArgs> argsWriterHolder(pArgs, sizeof(GenericHandleArgs));
argsWriterHolder.GetRW()->dictionaryIndexAndSlot = dictionaryIndexAndSlot;
argsWriterHolder.GetRW()->signature = pLookup->signature;
argsWriterHolder.GetRW()->module = (CORINFO_MODULE_HANDLE)pModule;
WORD slotOffset = (WORD)(dictionaryIndexAndSlot & 0xFFFF) * sizeof(Dictionary*);
// It's available only via the run-time helper function
if (pLookup->indirections == CORINFO_USEHELPER)
{
BEGIN_DYNAMIC_HELPER_EMIT(15);
// rcx/rdi contains the generic context parameter
// mov rdx/rsi,pArgs
// jmp helperAddress
EmitHelperWithArg(p, rxOffset, pAllocator, (TADDR)pArgs, helperAddress);
END_DYNAMIC_HELPER_EMIT();
}
else
{
int indirectionsSize = 0;
for (WORD i = 0; i < pLookup->indirections; i++)
indirectionsSize += (pLookup->offsets[i] >= 0x80 ? 7 : 4);
int codeSize = indirectionsSize + (pLookup->testForNull ? 21 : 1) + (pLookup->sizeOffset != CORINFO_NO_SIZE_CHECK ? 13 : 0);
BEGIN_DYNAMIC_HELPER_EMIT(codeSize);
BYTE* pJLECall = NULL;
for (WORD i = 0; i < pLookup->indirections; i++)
{
if (i == pLookup->indirections - 1 && pLookup->sizeOffset != CORINFO_NO_SIZE_CHECK)
{
_ASSERTE(pLookup->testForNull && i > 0);
// cmp qword ptr[rax + sizeOffset],slotOffset
*(UINT32*)p = 0x00b88148; p += 3;
*(UINT32*)p = (UINT32)pLookup->sizeOffset; p += 4;
*(UINT32*)p = (UINT32)slotOffset; p += 4;
// jle 'HELPER CALL'
*p++ = 0x7e;
pJLECall = p++; // Offset filled later
}
if (i == 0)
{
// Move from rcx|rdi if it's the first indirection, otherwise from rax
#ifdef UNIX_AMD64_ABI
// mov rax,qword ptr [rdi+offset]
if (pLookup->offsets[i] >= 0x80)
{
*(UINT32*)p = 0x00878b48; p += 3;
*(UINT32*)p = (UINT32)pLookup->offsets[i]; p += 4;
}
else
{
*(UINT32*)p = 0x00478b48; p += 3;
*p++ = (BYTE)pLookup->offsets[i];
}
#else
// mov rax,qword ptr [rcx+offset]
if (pLookup->offsets[i] >= 0x80)