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stubs.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.
//
// File: stubs.cpp
//
// This file contains stub functions for unimplemented features need to
// run on the ARM64 platform.
#include "common.h"
#include "dllimportcallback.h"
#include "comdelegate.h"
#include "asmconstants.h"
#include "virtualcallstub.h"
#include "jitinterface.h"
#include "ecall.h"
#ifndef DACCESS_COMPILE
//-----------------------------------------------------------------------
// InstructionFormat for B.cond
//-----------------------------------------------------------------------
class ConditionalBranchInstructionFormat : public InstructionFormat
{
public:
ConditionalBranchInstructionFormat() : InstructionFormat(InstructionFormat::k32)
{
LIMITED_METHOD_CONTRACT;
}
virtual UINT GetSizeOfInstruction(UINT refsize, UINT variationCode)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(refsize == InstructionFormat::k32);
return 4;
}
virtual UINT GetHotSpotOffset(UINT refsize, UINT variationCode)
{
WRAPPER_NO_CONTRACT;
return 0;
}
virtual BOOL CanReach(UINT refSize, UINT variationCode, BOOL fExternal, INT_PTR offset)
{
_ASSERTE(!fExternal || "ARM64:NYI - CompareAndBranchInstructionFormat::CanReach external");
if (fExternal)
return false;
if (offset < -1048576 || offset > 1048572)
return false;
return true;
}
// B.<cond> <label>
// Encoding 0|1|0|1|0|1|0|0|imm19|0|cond
// cond = Bits3-0(variation)
// imm19 = bits19-0(fixedUpReference/4), will be SignExtended
virtual VOID EmitInstruction(UINT refSize, int64_t fixedUpReference, BYTE *pOutBufferRX, BYTE *pOutBufferRW, UINT variationCode, BYTE *pDataBuffer)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(refSize == InstructionFormat::k32);
if (fixedUpReference < -1048576 || fixedUpReference > 1048572)
COMPlusThrow(kNotSupportedException);
_ASSERTE((fixedUpReference & 0x3) == 0);
DWORD imm19 = (DWORD)(0x7FFFF & (fixedUpReference >> 2));
pOutBufferRW[0] = static_cast<BYTE>((0x7 & imm19 /* Bits2-0(imm19) */) << 5 | (0xF & variationCode /* cond */));
pOutBufferRW[1] = static_cast<BYTE>((0x7F8 & imm19 /* Bits10-3(imm19) */) >> 3);
pOutBufferRW[2] = static_cast<BYTE>((0x7F800 & imm19 /* Bits19-11(imm19) */) >> 11);
pOutBufferRW[3] = static_cast<BYTE>(0x54);
}
};
//-----------------------------------------------------------------------
// InstructionFormat for B(L)(R) (unconditional branch)
//-----------------------------------------------------------------------
class BranchInstructionFormat : public InstructionFormat
{
// Encoding of the VariationCode:
// bit(0) indicates whether this is a direct or an indirect jump.
// bit(1) indicates whether this is a branch with link -a.k.a call- (BL(R)) or not (B(R))
public:
enum VariationCodes
{
BIF_VAR_INDIRECT = 0x00000001,
BIF_VAR_CALL = 0x00000002,
BIF_VAR_JUMP = 0x00000000,
BIF_VAR_INDIRECT_CALL = 0x00000003
};
private:
BOOL IsIndirect(UINT variationCode)
{
return (variationCode & BIF_VAR_INDIRECT) != 0;
}
BOOL IsCall(UINT variationCode)
{
return (variationCode & BIF_VAR_CALL) != 0;
}
public:
BranchInstructionFormat() : InstructionFormat(InstructionFormat::k64)
{
LIMITED_METHOD_CONTRACT;
}
virtual UINT GetSizeOfInstruction(UINT refSize, UINT variationCode)
{
LIMITED_METHOD_CONTRACT;
_ASSERTE(refSize == InstructionFormat::k64);
if (IsIndirect(variationCode))
return 12;
else
return 8;
}
virtual UINT GetSizeOfData(UINT refSize, UINT variationCode)
{
WRAPPER_NO_CONTRACT;
return 8;
}
virtual UINT GetHotSpotOffset(UINT refsize, UINT variationCode)
{
WRAPPER_NO_CONTRACT;
return 0;
}
virtual BOOL CanReach(UINT refSize, UINT variationCode, BOOL fExternal, INT_PTR offset)
{
if (fExternal)
{
// Note that the parameter 'offset' is not an offset but the target address itself (when fExternal is true)
return (refSize == InstructionFormat::k64);
}
else
{
return ((offset >= -134217728 && offset <= 134217724) || (refSize == InstructionFormat::k64));
}
}
virtual VOID EmitInstruction(UINT refSize, int64_t fixedUpReference, BYTE *pOutBufferRX, BYTE *pOutBufferRW, UINT variationCode, BYTE *pDataBuffer)
{
LIMITED_METHOD_CONTRACT;
if (IsIndirect(variationCode))
{
_ASSERTE(((UINT_PTR)pDataBuffer & 7) == 0);
int64_t dataOffset = pDataBuffer - pOutBufferRW;
if (dataOffset < -1048576 || dataOffset > 1048572)
COMPlusThrow(kNotSupportedException);
DWORD imm19 = (DWORD)(0x7FFFF & (dataOffset >> 2));
// +0: ldr x16, [pc, #dataOffset]
// +4: ldr x16, [x16]
// +8: b(l)r x16
*((DWORD*)pOutBufferRW) = (0x58000010 | (imm19 << 5));
*((DWORD*)(pOutBufferRW+4)) = 0xF9400210;
if (IsCall(variationCode))
{
*((DWORD*)(pOutBufferRW+8)) = 0xD63F0200; // blr x16
}
else
{
*((DWORD*)(pOutBufferRW+8)) = 0xD61F0200; // br x16
}
*((int64_t*)pDataBuffer) = fixedUpReference + (int64_t)pOutBufferRX;
}
else
{
_ASSERTE(((UINT_PTR)pDataBuffer & 7) == 0);
int64_t dataOffset = pDataBuffer - pOutBufferRW;
if (dataOffset < -1048576 || dataOffset > 1048572)
COMPlusThrow(kNotSupportedException);
DWORD imm19 = (DWORD)(0x7FFFF & (dataOffset >> 2));
// +0: ldr x16, [pc, #dataOffset]
// +4: b(l)r x16
*((DWORD*)pOutBufferRW) = (0x58000010 | (imm19 << 5));
if (IsCall(variationCode))
{
*((DWORD*)(pOutBufferRW+4)) = 0xD63F0200; // blr x16
}
else
{
*((DWORD*)(pOutBufferRW+4)) = 0xD61F0200; // br x16
}
if (!ClrSafeInt<int64_t>::addition(fixedUpReference, (int64_t)pOutBufferRX, fixedUpReference))
COMPlusThrowArithmetic();
*((int64_t*)pDataBuffer) = fixedUpReference;
}
}
};
//-----------------------------------------------------------------------
// InstructionFormat for loading a label to the register (ADRP/ADR)
//-----------------------------------------------------------------------
class LoadFromLabelInstructionFormat : public InstructionFormat
{
public:
LoadFromLabelInstructionFormat() : InstructionFormat( InstructionFormat::k32)
{
LIMITED_METHOD_CONTRACT;
}
virtual UINT GetSizeOfInstruction(UINT refSize, UINT variationCode)
{
WRAPPER_NO_CONTRACT;
return 8;
}
virtual UINT GetHotSpotOffset(UINT refsize, UINT variationCode)
{
WRAPPER_NO_CONTRACT;
return 0;
}
virtual BOOL CanReach(UINT refSize, UINT variationCode, BOOL fExternal, INT_PTR offset)
{
return fExternal;
}
virtual VOID EmitInstruction(UINT refSize, int64_t fixedUpReference, BYTE *pOutBufferRX, BYTE *pOutBufferRW, UINT variationCode, BYTE *pDataBuffer)
{
LIMITED_METHOD_CONTRACT;
// VariationCode is used to indicate the register the label is going to be loaded
DWORD imm =(DWORD)(fixedUpReference>>12);
if (imm>>21)
COMPlusThrow(kNotSupportedException);
// Can't use SP or XZR
_ASSERTE((variationCode & 0x1F) != 31);
// adrp Xt, #Page_of_fixedUpReference
*((DWORD*)pOutBufferRW) = ((9<<28) | ((imm & 3)<<29) | (imm>>2)<<5 | (variationCode&0x1F));
// ldr Xt, [Xt, #offset_of_fixedUpReference_to_its_page]
UINT64 target = (UINT64)(fixedUpReference + pOutBufferRX)>>3;
*((DWORD*)(pOutBufferRW+4)) = ( 0xF9400000 | ((target & 0x1FF)<<10) | (variationCode & 0x1F)<<5 | (variationCode & 0x1F));
}
};
static BYTE gConditionalBranchIF[sizeof(ConditionalBranchInstructionFormat)];
static BYTE gBranchIF[sizeof(BranchInstructionFormat)];
static BYTE gLoadFromLabelIF[sizeof(LoadFromLabelInstructionFormat)];
#endif
void ClearRegDisplayArgumentAndScratchRegisters(REGDISPLAY * pRD)
{
for (int i=0; i < 18; i++)
pRD->volatileCurrContextPointers.X[i] = NULL;
}
void LazyMachState::unwindLazyState(LazyMachState* baseState,
MachState* unwoundstate,
DWORD threadId,
int funCallDepth)
{
T_CONTEXT context;
T_KNONVOLATILE_CONTEXT_POINTERS nonVolContextPtrs;
context.ContextFlags = 0; // Read by PAL_VirtualUnwind.
context.X19 = unwoundstate->captureX19_X29[0] = baseState->captureX19_X29[0];
context.X20 = unwoundstate->captureX19_X29[1] = baseState->captureX19_X29[1];
context.X21 = unwoundstate->captureX19_X29[2] = baseState->captureX19_X29[2];
context.X22 = unwoundstate->captureX19_X29[3] = baseState->captureX19_X29[3];
context.X23 = unwoundstate->captureX19_X29[4] = baseState->captureX19_X29[4];
context.X24 = unwoundstate->captureX19_X29[5] = baseState->captureX19_X29[5];
context.X25 = unwoundstate->captureX19_X29[6] = baseState->captureX19_X29[6];
context.X26 = unwoundstate->captureX19_X29[7] = baseState->captureX19_X29[7];
context.X27 = unwoundstate->captureX19_X29[8] = baseState->captureX19_X29[8];
context.X28 = unwoundstate->captureX19_X29[9] = baseState->captureX19_X29[9];
context.Fp = unwoundstate->captureX19_X29[10] = baseState->captureX19_X29[10];
context.Lr = 0; // Filled by the unwinder
context.Sp = baseState->captureSp;
context.Pc = baseState->captureIp;
#if !defined(DACCESS_COMPILE)
// For DAC, if we get here, it means that the LazyMachState is uninitialized and we have to unwind it.
// The API we use to unwind in DAC is StackWalk64(), which does not support the context pointers.
//
// Restore the integer registers to KNONVOLATILE_CONTEXT_POINTERS to be used for unwinding.
nonVolContextPtrs.X19 = &unwoundstate->captureX19_X29[0];
nonVolContextPtrs.X20 = &unwoundstate->captureX19_X29[1];
nonVolContextPtrs.X21 = &unwoundstate->captureX19_X29[2];
nonVolContextPtrs.X22 = &unwoundstate->captureX19_X29[3];
nonVolContextPtrs.X23 = &unwoundstate->captureX19_X29[4];
nonVolContextPtrs.X24 = &unwoundstate->captureX19_X29[5];
nonVolContextPtrs.X25 = &unwoundstate->captureX19_X29[6];
nonVolContextPtrs.X26 = &unwoundstate->captureX19_X29[7];
nonVolContextPtrs.X27 = &unwoundstate->captureX19_X29[8];
nonVolContextPtrs.X28 = &unwoundstate->captureX19_X29[9];
nonVolContextPtrs.Fp = &unwoundstate->captureX19_X29[10];
nonVolContextPtrs.Lr = 0; // Filled by the unwinder
#endif // DACCESS_COMPILE
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK LazyMachState::unwindLazyState(ip:%p,sp:%p)\n", baseState->captureIp, baseState->captureSp));
PCODE pvControlPc;
do {
#ifndef TARGET_UNIX
pvControlPc = Thread::VirtualUnwindCallFrame(&context, &nonVolContextPtrs);
#else // !TARGET_UNIX
#ifdef DACCESS_COMPILE
HRESULT hr = DacVirtualUnwind(threadId, &context, &nonVolContextPtrs);
if (FAILED(hr))
{
DacError(hr);
}
#else // DACCESS_COMPILE
BOOL success = PAL_VirtualUnwind(&context, &nonVolContextPtrs);
if (!success)
{
_ASSERTE(!"unwindLazyState: Unwinding failed");
EEPOLICY_HANDLE_FATAL_ERROR(COR_E_EXECUTIONENGINE);
}
#endif // DACCESS_COMPILE
pvControlPc = GetIP(&context);
#endif // !TARGET_UNIX
if (funCallDepth > 0)
{
funCallDepth--;
if (funCallDepth == 0)
break;
}
else
{
// Determine whether given IP resides in JITted code. (It returns nonzero in that case.)
// Use it now to see if we've unwound to managed code yet.
BOOL fIsManagedCode = ExecutionManager::IsManagedCode(pvControlPc);
if (fIsManagedCode)
break;
}
} while (true);
#ifdef __APPLE__
unwoundstate->unwoundX19_X29[0] = context.X19;
unwoundstate->unwoundX19_X29[1] = context.X20;
unwoundstate->unwoundX19_X29[2] = context.X21;
unwoundstate->unwoundX19_X29[3] = context.X22;
unwoundstate->unwoundX19_X29[4] = context.X23;
unwoundstate->unwoundX19_X29[5] = context.X24;
unwoundstate->unwoundX19_X29[6] = context.X25;
unwoundstate->unwoundX19_X29[7] = context.X26;
unwoundstate->unwoundX19_X29[8] = context.X27;
unwoundstate->unwoundX19_X29[9] = context.X28;
unwoundstate->unwoundX19_X29[10] = context.Fp;
#endif // __APPLE__
#ifdef DACCESS_COMPILE
// For DAC builds, we update the registers directly since we dont have context pointers
unwoundstate->captureX19_X29[0] = context.X19;
unwoundstate->captureX19_X29[1] = context.X20;
unwoundstate->captureX19_X29[2] = context.X21;
unwoundstate->captureX19_X29[3] = context.X22;
unwoundstate->captureX19_X29[4] = context.X23;
unwoundstate->captureX19_X29[5] = context.X24;
unwoundstate->captureX19_X29[6] = context.X25;
unwoundstate->captureX19_X29[7] = context.X26;
unwoundstate->captureX19_X29[8] = context.X27;
unwoundstate->captureX19_X29[9] = context.X28;
unwoundstate->captureX19_X29[10] = context.Fp;
#else // !DACCESS_COMPILE
// For non-DAC builds, update the register state from context pointers
unwoundstate->ptrX19_X29[0] = nonVolContextPtrs.X19;
unwoundstate->ptrX19_X29[1] = nonVolContextPtrs.X20;
unwoundstate->ptrX19_X29[2] = nonVolContextPtrs.X21;
unwoundstate->ptrX19_X29[3] = nonVolContextPtrs.X22;
unwoundstate->ptrX19_X29[4] = nonVolContextPtrs.X23;
unwoundstate->ptrX19_X29[5] = nonVolContextPtrs.X24;
unwoundstate->ptrX19_X29[6] = nonVolContextPtrs.X25;
unwoundstate->ptrX19_X29[7] = nonVolContextPtrs.X26;
unwoundstate->ptrX19_X29[8] = nonVolContextPtrs.X27;
unwoundstate->ptrX19_X29[9] = nonVolContextPtrs.X28;
unwoundstate->ptrX19_X29[10] = nonVolContextPtrs.Fp;
#endif // DACCESS_COMPILE
unwoundstate->_pc = context.Pc;
unwoundstate->_sp = context.Sp;
unwoundstate->_isValid = TRUE;
}
void HelperMethodFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
SUPPORTS_DAC;
}
CONTRACTL_END;
#ifndef DACCESS_COMPILE
if (updateFloats)
{
UpdateFloatingPointRegisters(pRD);
_ASSERTE(pRD->pCurrentContext->Pc == GetReturnAddress());
}
#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._pc, m_MachState._sp));
#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->Pc = pRD->ControlPC = pUnwoundState->_pc;
pRD->pCurrentContext->Sp = pRD->SP = pUnwoundState->_sp;
pRD->pCurrentContext->X19 = (DWORD64)(pUnwoundState->captureX19_X29[0]);
pRD->pCurrentContext->X20 = (DWORD64)(pUnwoundState->captureX19_X29[1]);
pRD->pCurrentContext->X21 = (DWORD64)(pUnwoundState->captureX19_X29[2]);
pRD->pCurrentContext->X22 = (DWORD64)(pUnwoundState->captureX19_X29[3]);
pRD->pCurrentContext->X23 = (DWORD64)(pUnwoundState->captureX19_X29[4]);
pRD->pCurrentContext->X24 = (DWORD64)(pUnwoundState->captureX19_X29[5]);
pRD->pCurrentContext->X25 = (DWORD64)(pUnwoundState->captureX19_X29[6]);
pRD->pCurrentContext->X26 = (DWORD64)(pUnwoundState->captureX19_X29[7]);
pRD->pCurrentContext->X27 = (DWORD64)(pUnwoundState->captureX19_X29[8]);
pRD->pCurrentContext->X28 = (DWORD64)(pUnwoundState->captureX19_X29[9]);
pRD->pCurrentContext->Fp = (DWORD64)(pUnwoundState->captureX19_X29[10]);
pRD->pCurrentContext->Lr = 0; // Unwind again to get Caller's PC
pRD->pCurrentContextPointers->X19 = &pRD->pCurrentContext->X19;
pRD->pCurrentContextPointers->X20 = &pRD->pCurrentContext->X20;
pRD->pCurrentContextPointers->X21 = &pRD->pCurrentContext->X21;
pRD->pCurrentContextPointers->X22 = &pRD->pCurrentContext->X22;
pRD->pCurrentContextPointers->X23 = &pRD->pCurrentContext->X23;
pRD->pCurrentContextPointers->X24 = &pRD->pCurrentContext->X24;
pRD->pCurrentContextPointers->X25 = &pRD->pCurrentContext->X25;
pRD->pCurrentContextPointers->X26 = &pRD->pCurrentContext->X26;
pRD->pCurrentContextPointers->X27 = &pRD->pCurrentContext->X27;
pRD->pCurrentContextPointers->X28 = &pRD->pCurrentContext->X28;
pRD->pCurrentContextPointers->Fp = &pRD->pCurrentContext->Fp;
pRD->pCurrentContextPointers->Lr = &pRD->pCurrentContext->Lr;
return;
}
#endif // DACCESS_COMPILE
// reset pContext; it's only valid for active (top-most) frame
pRD->pContext = NULL;
pRD->ControlPC = GetReturnAddress(); // m_MachState._pc;
pRD->SP = (DWORD64)(size_t)m_MachState._sp;
pRD->pCurrentContext->Pc = pRD->ControlPC;
pRD->pCurrentContext->Sp = pRD->SP;
#ifdef __APPLE__
pRD->pCurrentContext->X19 = (DWORD64)(m_MachState.unwoundX19_X29[0]);
pRD->pCurrentContext->X20 = (DWORD64)(m_MachState.unwoundX19_X29[1]);
pRD->pCurrentContext->X21 = (DWORD64)(m_MachState.unwoundX19_X29[2]);
pRD->pCurrentContext->X22 = (DWORD64)(m_MachState.unwoundX19_X29[3]);
pRD->pCurrentContext->X23 = (DWORD64)(m_MachState.unwoundX19_X29[4]);
pRD->pCurrentContext->X24 = (DWORD64)(m_MachState.unwoundX19_X29[5]);
pRD->pCurrentContext->X25 = (DWORD64)(m_MachState.unwoundX19_X29[6]);
pRD->pCurrentContext->X26 = (DWORD64)(m_MachState.unwoundX19_X29[7]);
pRD->pCurrentContext->X27 = (DWORD64)(m_MachState.unwoundX19_X29[8]);
pRD->pCurrentContext->X28 = (DWORD64)(m_MachState.unwoundX19_X29[9]);
pRD->pCurrentContext->Fp = (DWORD64)(m_MachState.unwoundX19_X29[10]);
pRD->pCurrentContext->Lr = 0; // Unwind again to get Caller's PC
#else // __APPLE__
pRD->pCurrentContext->X19 = *m_MachState.ptrX19_X29[0];
pRD->pCurrentContext->X20 = *m_MachState.ptrX19_X29[1];
pRD->pCurrentContext->X21 = *m_MachState.ptrX19_X29[2];
pRD->pCurrentContext->X22 = *m_MachState.ptrX19_X29[3];
pRD->pCurrentContext->X23 = *m_MachState.ptrX19_X29[4];
pRD->pCurrentContext->X24 = *m_MachState.ptrX19_X29[5];
pRD->pCurrentContext->X25 = *m_MachState.ptrX19_X29[6];
pRD->pCurrentContext->X26 = *m_MachState.ptrX19_X29[7];
pRD->pCurrentContext->X27 = *m_MachState.ptrX19_X29[8];
pRD->pCurrentContext->X28 = *m_MachState.ptrX19_X29[9];
pRD->pCurrentContext->Fp = *m_MachState.ptrX19_X29[10];
pRD->pCurrentContext->Lr = 0; // Unwind again to get Caller's PC
#endif // __APPLE__
#if !defined(DACCESS_COMPILE)
pRD->pCurrentContextPointers->X19 = m_MachState.ptrX19_X29[0];
pRD->pCurrentContextPointers->X20 = m_MachState.ptrX19_X29[1];
pRD->pCurrentContextPointers->X21 = m_MachState.ptrX19_X29[2];
pRD->pCurrentContextPointers->X22 = m_MachState.ptrX19_X29[3];
pRD->pCurrentContextPointers->X23 = m_MachState.ptrX19_X29[4];
pRD->pCurrentContextPointers->X24 = m_MachState.ptrX19_X29[5];
pRD->pCurrentContextPointers->X25 = m_MachState.ptrX19_X29[6];
pRD->pCurrentContextPointers->X26 = m_MachState.ptrX19_X29[7];
pRD->pCurrentContextPointers->X27 = m_MachState.ptrX19_X29[8];
pRD->pCurrentContextPointers->X28 = m_MachState.ptrX19_X29[9];
pRD->pCurrentContextPointers->Fp = m_MachState.ptrX19_X29[10];
pRD->pCurrentContextPointers->Lr = 0; // Unwind again to get Caller's PC
#endif
ClearRegDisplayArgumentAndScratchRegisters(pRD);
}
void UpdateRegDisplayFromCalleeSavedRegisters(REGDISPLAY * pRD, CalleeSavedRegisters * pCalleeSaved)
{
LIMITED_METHOD_CONTRACT;
pRD->pCurrentContext->X19 = pCalleeSaved->x19;
pRD->pCurrentContext->X20 = pCalleeSaved->x20;
pRD->pCurrentContext->X21 = pCalleeSaved->x21;
pRD->pCurrentContext->X22 = pCalleeSaved->x22;
pRD->pCurrentContext->X23 = pCalleeSaved->x23;
pRD->pCurrentContext->X24 = pCalleeSaved->x24;
pRD->pCurrentContext->X25 = pCalleeSaved->x25;
pRD->pCurrentContext->X26 = pCalleeSaved->x26;
pRD->pCurrentContext->X27 = pCalleeSaved->x27;
pRD->pCurrentContext->X28 = pCalleeSaved->x28;
pRD->pCurrentContext->Fp = pCalleeSaved->x29;
pRD->pCurrentContext->Lr = pCalleeSaved->x30;
T_KNONVOLATILE_CONTEXT_POINTERS * pContextPointers = pRD->pCurrentContextPointers;
pContextPointers->X19 = (PDWORD64)&pCalleeSaved->x19;
pContextPointers->X20 = (PDWORD64)&pCalleeSaved->x20;
pContextPointers->X21 = (PDWORD64)&pCalleeSaved->x21;
pContextPointers->X22 = (PDWORD64)&pCalleeSaved->x22;
pContextPointers->X23 = (PDWORD64)&pCalleeSaved->x23;
pContextPointers->X24 = (PDWORD64)&pCalleeSaved->x24;
pContextPointers->X25 = (PDWORD64)&pCalleeSaved->x25;
pContextPointers->X26 = (PDWORD64)&pCalleeSaved->x26;
pContextPointers->X27 = (PDWORD64)&pCalleeSaved->x27;
pContextPointers->X28 = (PDWORD64)&pCalleeSaved->x28;
pContextPointers->Fp = (PDWORD64)&pCalleeSaved->x29;
pContextPointers->Lr = (PDWORD64)&pCalleeSaved->x30;
}
void TransitionFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
#ifndef DACCESS_COMPILE
if (updateFloats)
{
UpdateFloatingPointRegisters(pRD);
_ASSERTE(pRD->pCurrentContext->Pc == GetReturnAddress());
}
#endif // DACCESS_COMPILE
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
// copy the callee saved regs
CalleeSavedRegisters *pCalleeSaved = GetCalleeSavedRegisters();
UpdateRegDisplayFromCalleeSavedRegisters(pRD, pCalleeSaved);
ClearRegDisplayArgumentAndScratchRegisters(pRD);
// copy the control registers
pRD->pCurrentContext->Fp = pCalleeSaved->x29;
pRD->pCurrentContext->Lr = pCalleeSaved->x30;
pRD->pCurrentContext->Pc = GetReturnAddress();
pRD->pCurrentContext->Sp = this->GetSP();
// Finally, syncup the regdisplay with the context
SyncRegDisplayToCurrentContext(pRD);
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK TransitionFrame::UpdateRegDisplay_Impl(pc:%p, sp:%p)\n", pRD->ControlPC, pRD->SP));
}
void FaultingExceptionFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
LIMITED_METHOD_DAC_CONTRACT;
// Copy the context to regdisplay
memcpy(pRD->pCurrentContext, &m_ctx, sizeof(T_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 = ::GetIP(&m_ctx);
pRD->SP = ::GetSP(&m_ctx);
// Update the integer registers in KNONVOLATILE_CONTEXT_POINTERS from
// the exception context we have.
pRD->pCurrentContextPointers->X19 = (PDWORD64)&m_ctx.X19;
pRD->pCurrentContextPointers->X20 = (PDWORD64)&m_ctx.X20;
pRD->pCurrentContextPointers->X21 = (PDWORD64)&m_ctx.X21;
pRD->pCurrentContextPointers->X22 = (PDWORD64)&m_ctx.X22;
pRD->pCurrentContextPointers->X23 = (PDWORD64)&m_ctx.X23;
pRD->pCurrentContextPointers->X24 = (PDWORD64)&m_ctx.X24;
pRD->pCurrentContextPointers->X25 = (PDWORD64)&m_ctx.X25;
pRD->pCurrentContextPointers->X26 = (PDWORD64)&m_ctx.X26;
pRD->pCurrentContextPointers->X27 = (PDWORD64)&m_ctx.X27;
pRD->pCurrentContextPointers->X28 = (PDWORD64)&m_ctx.X28;
pRD->pCurrentContextPointers->Fp = (PDWORD64)&m_ctx.Fp;
pRD->pCurrentContextPointers->Lr = (PDWORD64)&m_ctx.Lr;
ClearRegDisplayArgumentAndScratchRegisters(pRD);
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK FaultingExceptionFrame::UpdateRegDisplay_Impl(pc:%p, sp:%p)\n", pRD->ControlPC, pRD->SP));
}
void InlinedCallFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
CONTRACT_VOID
{
NOTHROW;
GC_NOTRIGGER;
#ifdef PROFILING_SUPPORTED
PRECONDITION(CORProfilerStackSnapshotEnabled() || InlinedCallFrame::FrameHasActiveCall(this));
#endif
MODE_ANY;
SUPPORTS_DAC;
}
CONTRACT_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);
}
#endif // DACCESS_COMPILE
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE;
pRD->pCurrentContext->Pc = *(DWORD64 *)&m_pCallerReturnAddress;
pRD->pCurrentContext->Sp = *(DWORD64 *)&m_pCallSiteSP;
pRD->pCurrentContext->Fp = *(DWORD64 *)&m_pCalleeSavedFP;
pRD->pCurrentContextPointers->X19 = NULL;
pRD->pCurrentContextPointers->X20 = NULL;
pRD->pCurrentContextPointers->X21 = NULL;
pRD->pCurrentContextPointers->X22 = NULL;
pRD->pCurrentContextPointers->X23 = NULL;
pRD->pCurrentContextPointers->X24 = NULL;
pRD->pCurrentContextPointers->X25 = NULL;
pRD->pCurrentContextPointers->X26 = NULL;
pRD->pCurrentContextPointers->X27 = NULL;
pRD->pCurrentContextPointers->X28 = NULL;
pRD->ControlPC = m_pCallerReturnAddress;
pRD->SP = (DWORD64) dac_cast<TADDR>(m_pCallSiteSP);
// reset pContext; it's only valid for active (top-most) frame
pRD->pContext = NULL;
ClearRegDisplayArgumentAndScratchRegisters(pRD);
// Update the frame pointer in the current context.
pRD->pCurrentContextPointers->Fp = (DWORD64 *)&m_pCalleeSavedFP;
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK InlinedCallFrame::UpdateRegDisplay_Impl(pc:%p, sp:%p)\n", pRD->ControlPC, pRD->SP));
RETURN;
}
#ifdef FEATURE_HIJACK
TADDR ResumableFrame::GetReturnAddressPtr_Impl(void)
{
LIMITED_METHOD_DAC_CONTRACT;
return dac_cast<TADDR>(m_Regs) + offsetof(T_CONTEXT, Pc);
}
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(T_CONTEXT));
pRD->ControlPC = m_Regs->Pc;
pRD->SP = m_Regs->Sp;
pRD->pCurrentContextPointers->X19 = &m_Regs->X19;
pRD->pCurrentContextPointers->X20 = &m_Regs->X20;
pRD->pCurrentContextPointers->X21 = &m_Regs->X21;
pRD->pCurrentContextPointers->X22 = &m_Regs->X22;
pRD->pCurrentContextPointers->X23 = &m_Regs->X23;
pRD->pCurrentContextPointers->X24 = &m_Regs->X24;
pRD->pCurrentContextPointers->X25 = &m_Regs->X25;
pRD->pCurrentContextPointers->X26 = &m_Regs->X26;
pRD->pCurrentContextPointers->X27 = &m_Regs->X27;
pRD->pCurrentContextPointers->X28 = &m_Regs->X28;
pRD->pCurrentContextPointers->Fp = &m_Regs->Fp;
pRD->pCurrentContextPointers->Lr = &m_Regs->Lr;
for (int i=0; i < 18; i++)
pRD->volatileCurrContextPointers.X[i] = &m_Regs->X[i];
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE; // Don't add usage of this field. This is only temporary.
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK ResumableFrame::UpdateRegDisplay_Impl(pc:%p, sp:%p)\n", pRD->ControlPC, pRD->SP));
RETURN;
}
void HijackFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool updateFloats)
{
LIMITED_METHOD_CONTRACT;
pRD->IsCallerContextValid = FALSE;
pRD->IsCallerSPValid = FALSE;
pRD->pCurrentContext->Pc = m_ReturnAddress;
size_t s = sizeof(struct HijackArgs);
_ASSERTE(s%8 == 0); // HijackArgs contains register values and hence will be a multiple of 8
// stack must be multiple of 16. So if s is not multiple of 16 then there must be padding of 8 bytes
s = s + s%16;
pRD->pCurrentContext->Sp = PTR_TO_TADDR(m_Args) + s ;
pRD->pCurrentContext->X0 = m_Args->X0;
pRD->pCurrentContext->X1 = m_Args->X1;
pRD->volatileCurrContextPointers.X0 = &m_Args->X0;
pRD->volatileCurrContextPointers.X1 = &m_Args->X1;
pRD->pCurrentContext->X19 = m_Args->X19;
pRD->pCurrentContext->X20 = m_Args->X20;
pRD->pCurrentContext->X21 = m_Args->X21;
pRD->pCurrentContext->X22 = m_Args->X22;
pRD->pCurrentContext->X23 = m_Args->X23;
pRD->pCurrentContext->X24 = m_Args->X24;
pRD->pCurrentContext->X25 = m_Args->X25;
pRD->pCurrentContext->X26 = m_Args->X26;
pRD->pCurrentContext->X27 = m_Args->X27;
pRD->pCurrentContext->X28 = m_Args->X28;
pRD->pCurrentContext->Fp = m_Args->X29;
pRD->pCurrentContext->Lr = m_Args->Lr;
pRD->pCurrentContextPointers->X19 = &m_Args->X19;
pRD->pCurrentContextPointers->X20 = &m_Args->X20;
pRD->pCurrentContextPointers->X21 = &m_Args->X21;
pRD->pCurrentContextPointers->X22 = &m_Args->X22;
pRD->pCurrentContextPointers->X23 = &m_Args->X23;
pRD->pCurrentContextPointers->X24 = &m_Args->X24;
pRD->pCurrentContextPointers->X25 = &m_Args->X25;
pRD->pCurrentContextPointers->X26 = &m_Args->X26;
pRD->pCurrentContextPointers->X27 = &m_Args->X27;
pRD->pCurrentContextPointers->X28 = &m_Args->X28;
pRD->pCurrentContextPointers->Fp = &m_Args->X29;
pRD->pCurrentContextPointers->Lr = NULL;
SyncRegDisplayToCurrentContext(pRD);
LOG((LF_GCROOTS, LL_INFO100000, "STACKWALK HijackFrame::UpdateRegDisplay_Impl(pc:%p, sp:%p)\n", pRD->ControlPC, pRD->SP));
}
#endif // FEATURE_HIJACK
#ifdef FEATURE_COMINTEROP
void emitCOMStubCall (ComCallMethodDesc *pCOMMethodRX, ComCallMethodDesc *pCOMMethodRW, PCODE target)
{
WRAPPER_NO_CONTRACT;
// adr x12, label_comCallMethodDesc
// ldr x10, label_target
// br x10
// 4 byte padding for alignment
// label_target:
// target address (8 bytes)
// label_comCallMethodDesc:
DWORD rgCode[] = {
0x100000cc,
0x5800006a,
0xd61f0140
};
BYTE *pBufferRX = (BYTE*)pCOMMethodRX - COMMETHOD_CALL_PRESTUB_SIZE;
BYTE *pBufferRW = (BYTE*)pCOMMethodRW - COMMETHOD_CALL_PRESTUB_SIZE;
memcpy(pBufferRW, rgCode, sizeof(rgCode));
*((PCODE*)(pBufferRW + sizeof(rgCode) + 4)) = target;
// Ensure that the updated instructions get actually written
ClrFlushInstructionCache(pBufferRX, COMMETHOD_CALL_PRESTUB_SIZE);
_ASSERTE(IS_ALIGNED(pBufferRX + COMMETHOD_CALL_PRESTUB_ADDRESS_OFFSET, sizeof(void*)) &&
*((PCODE*)(pBufferRX + COMMETHOD_CALL_PRESTUB_ADDRESS_OFFSET)) == target);
}
#endif // FEATURE_COMINTEROP
#if !defined(DACCESS_COMPILE)
EXTERN_C void JIT_UpdateWriteBarrierState(bool skipEphemeralCheck, size_t writeableOffset);
extern "C" void STDCALL JIT_PatchedCodeStart();
extern "C" void STDCALL JIT_PatchedCodeLast();
static void UpdateWriteBarrierState(bool skipEphemeralCheck)
{
BYTE *writeBarrierCodeStart = GetWriteBarrierCodeLocation((void*)JIT_PatchedCodeStart);
BYTE *writeBarrierCodeStartRW = writeBarrierCodeStart;
ExecutableWriterHolderNoLog<BYTE> writeBarrierWriterHolder;
if (IsWriteBarrierCopyEnabled())
{
writeBarrierWriterHolder.AssignExecutableWriterHolder(writeBarrierCodeStart, (BYTE*)JIT_PatchedCodeLast - (BYTE*)JIT_PatchedCodeStart);
writeBarrierCodeStartRW = writeBarrierWriterHolder.GetRW();
}
JIT_UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap(), writeBarrierCodeStartRW - writeBarrierCodeStart);
}
void InitJITHelpers1()
{
STANDARD_VM_CONTRACT;
_ASSERTE(g_SystemInfo.dwNumberOfProcessors != 0);
// Allocation helpers, faster but non-logging
if (!((TrackAllocationsEnabled()) ||
(LoggingOn(LF_GCALLOC, LL_INFO10))
#ifdef _DEBUG
|| (g_pConfig->ShouldInjectFault(INJECTFAULT_GCHEAP) != 0)
#endif // _DEBUG
))
{
if (GCHeapUtilities::UseThreadAllocationContexts())
{
SetJitHelperFunction(CORINFO_HELP_NEWSFAST, JIT_NewS_MP_FastPortable);
SetJitHelperFunction(CORINFO_HELP_NEWSFAST_ALIGN8, JIT_NewS_MP_FastPortable);
SetJitHelperFunction(CORINFO_HELP_NEWARR_1_VC, JIT_NewArr1VC_MP_FastPortable);
SetJitHelperFunction(CORINFO_HELP_NEWARR_1_OBJ, JIT_NewArr1OBJ_MP_FastPortable);
SetJitHelperFunction(CORINFO_HELP_BOX, JIT_Box_MP_FastPortable);
ECall::DynamicallyAssignFCallImpl(GetEEFuncEntryPoint(AllocateString_MP_FastPortable), ECall::FastAllocateString);
}
}
UpdateWriteBarrierState(GCHeapUtilities::IsServerHeap());
}
#else
void UpdateWriteBarrierState(bool) {}
#endif // !defined(DACCESS_COMPILE)
#ifdef TARGET_WINDOWS
PTR_CONTEXT GetCONTEXTFromRedirectedStubStackFrame(T_DISPATCHER_CONTEXT * pDispatcherContext)
{
LIMITED_METHOD_DAC_CONTRACT;
DWORD64 stackSlot = pDispatcherContext->EstablisherFrame + REDIRECTSTUB_SP_OFFSET_CONTEXT;
PTR_PTR_CONTEXT ppContext = dac_cast<PTR_PTR_CONTEXT>((TADDR)stackSlot);
return *ppContext;
}
#endif // TARGET_WINDOWS
PTR_CONTEXT GetCONTEXTFromRedirectedStubStackFrame(T_CONTEXT * pContext)
{
LIMITED_METHOD_DAC_CONTRACT;
DWORD64 stackSlot = pContext->Sp + REDIRECTSTUB_SP_OFFSET_CONTEXT;
PTR_PTR_CONTEXT ppContext = dac_cast<PTR_PTR_CONTEXT>((TADDR)stackSlot);
return *ppContext;
}
#if !defined(DACCESS_COMPILE)
#ifdef TARGET_WINDOWS
FaultingExceptionFrame *GetFrameFromRedirectedStubStackFrame (DISPATCHER_CONTEXT *pDispatcherContext)
{
LIMITED_METHOD_CONTRACT;
return (FaultingExceptionFrame*)((TADDR)pDispatcherContext->ContextRecord->X19);
}
#endif // TARGET_WINDOWS
BOOL
AdjustContextForVirtualStub(
EXCEPTION_RECORD *pExceptionRecord,
CONTEXT *pContext)
{
LIMITED_METHOD_CONTRACT;
Thread * pThread = GetThreadNULLOk();
// We may not have a managed thread object. Example is an AV on the helper thread.
// (perhaps during StubManager::IsStub)
if (pThread == NULL)
{
return FALSE;
}
PCODE f_IP = GetIP(pContext);
bool isVirtualStubNullCheck = false;
#ifdef FEATURE_CACHED_INTERFACE_DISPATCH
if (VirtualCallStubManager::isCachedInterfaceDispatchStubAVLocation(f_IP))
{
isVirtualStubNullCheck = true;
}
#endif // FEATURE_CACHED_INTERFACE_DISPATCH
#ifdef FEATURE_VIRTUAL_STUB_DISPATCH
if (!isVirtualStubNullCheck)
{
StubCodeBlockKind sk = RangeSectionStubManager::GetStubKind(f_IP);
if (sk == STUB_CODE_BLOCK_VSD_DISPATCH_STUB)
{
if (*PTR_DWORD(f_IP) != DISPATCH_STUB_FIRST_DWORD)
{
_ASSERTE(!"AV in DispatchStub at unknown instruction");
}
else
{
isVirtualStubNullCheck = true;
}
}
else
if (sk == STUB_CODE_BLOCK_VSD_RESOLVE_STUB)
{
if (*PTR_DWORD(f_IP) != RESOLVE_STUB_FIRST_DWORD)
{
_ASSERTE(!"AV in ResolveStub at unknown instruction");
}
else
{
isVirtualStubNullCheck = true;
}
}
}
#endif // FEATURE_VIRTUAL_STUB_DISPATCH
if (!isVirtualStubNullCheck)
{
return FALSE;
}
PCODE callsite = GetAdjustedCallAddress(GetLR(pContext));
// Lr must already have been saved before calling so it should not be necessary to restore Lr
if (pExceptionRecord != NULL)
{
pExceptionRecord->ExceptionAddress = (PVOID)callsite;
}
SetIP(pContext, callsite);
return TRUE;
}
#endif // !DACCESS_COMPILE
#if !defined(DACCESS_COMPILE)
VOID ResetCurrentContext()
{
LIMITED_METHOD_CONTRACT;
}