Microsoft/Windows2000
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Windows2000/private/ntos/ke/ia64/context.c

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First commit
2001-01-01 00:00:00 +01:00
/*++
Module Name:
context.c
Abstract:
This module implement the code that transfer machine state between
context and kernel trap/exception frames.
Author:
William K. Cheung (wcheung) 06-Mar-1998
Environment:
Kernel mode only.
Revision History:
--*/
#include "ki.h"
VOID
RtlpFlushRSE (
OUT PULONGLONG BackingStore,
OUT PULONGLONG RNat
);
#define ALIGN_NATS(Result, Source, Start, AddressOffset, Mask) \
if (AddressOffset == Start) { \
Result = (ULONGLONG)Source; \
} else if (AddressOffset < Start) { \
Result = (ULONGLONG)(Source << (Start - AddressOffset)); \
} else { \
Result = (ULONGLONG)((Source >> (AddressOffset - Start)) | \
(Source << (64 + Start - AddressOffset))); \
} \
Result = Result & (ULONGLONG)Mask
#define EXTRACT_NATS(Result, Source, Start, AddressOffset, Mask) \
Result = (ULONGLONG)(Source & (ULONGLONG)Mask); \
if (AddressOffset < Start) { \
Result = Result >> (Start - AddressOffset); \
} else if (AddressOffset > Start) { \
Result = ((Result << (AddressOffset - Start)) | \
(Result >> (64 + Start - AddressOffset))); \
}
VOID
KiGetDebugContext (
IN PKTRAP_FRAME TrapFrame,
IN OUT PCONTEXT ContextFrame
)
/*++
Routine Description:
This routine moves the user mode h/w debug registers from the debug register
save area in the kernel stack to the context record.
Arguments:
TrapFrame - Supplies a pointer to a trap frame from which volatile context
should be copied into the context record.
ContextFrame - Supplies a pointer to the context frame that receives the
context.
Return Value:
None.
Note:
PSR.db must be set to activate the debug registers.
This is used for getting user mode debug registers.
--*/
{
PKDEBUG_REGISTERS DebugRegistersSaveArea;
if (TrapFrame->PreviousMode == UserMode) {
DebugRegistersSaveArea = GET_DEBUG_REGISTER_SAVEAREA();
RtlCopyMemory(&ContextFrame->DbI0,
(PVOID)DebugRegistersSaveArea,
sizeof(KDEBUG_REGISTERS));
}
}
VOID
KiSetDebugContext (
IN OUT PKTRAP_FRAME TrapFrame,
IN PCONTEXT ContextFrame,
IN KPROCESSOR_MODE PreviousMode
)
/*++
Routine Description:
This routine moves the debug context from the specified context frame into
the debug registers save area in the kernel stack.
Arguments:
TrapFrame - Supplies a pointer to a trap frame.
ContextFrame - Supplies a pointer to a context frame that contains the
context that is to be copied.
PreviousMode - Supplies the processor mode for the target context.
Return Value:
None.
Notes:
PSR.db must be set to activate the debug registers.
This is used for setting up debug registers for user mode.
--*/
{
PKDEBUG_REGISTERS DebugRegistersSaveArea; // User mode h/w debug registers
if (PreviousMode == UserMode) {
DebugRegistersSaveArea = GET_DEBUG_REGISTER_SAVEAREA();
// Sanitize the debug control regs. Leave the addresses unchanged.
DebugRegistersSaveArea->DbI0 = ContextFrame->DbI0;
DebugRegistersSaveArea->DbI1 = SANITIZE_DR(ContextFrame->DbI1,UserMode);
DebugRegistersSaveArea->DbI2 = ContextFrame->DbI2;
DebugRegistersSaveArea->DbI3 = SANITIZE_DR(ContextFrame->DbI3,UserMode);
DebugRegistersSaveArea->DbI4 = ContextFrame->DbI4;
DebugRegistersSaveArea->DbI5 = SANITIZE_DR(ContextFrame->DbI5,UserMode);
DebugRegistersSaveArea->DbI6 = ContextFrame->DbI6;
DebugRegistersSaveArea->DbI7 = SANITIZE_DR(ContextFrame->DbI7,UserMode);
DebugRegistersSaveArea->DbD0 = ContextFrame->DbD0;
DebugRegistersSaveArea->DbD1 = SANITIZE_DR(ContextFrame->DbD1,UserMode);
DebugRegistersSaveArea->DbD2 = ContextFrame->DbD2;
DebugRegistersSaveArea->DbD3 = SANITIZE_DR(ContextFrame->DbD3,UserMode);
DebugRegistersSaveArea->DbD4 = ContextFrame->DbD4;
DebugRegistersSaveArea->DbD5 = SANITIZE_DR(ContextFrame->DbD5,UserMode);
DebugRegistersSaveArea->DbD6 = ContextFrame->DbD6;
DebugRegistersSaveArea->DbD7 = SANITIZE_DR(ContextFrame->DbD7,UserMode);
}
}
VOID
KeContextFromKframes (
IN PKTRAP_FRAME TrapFrame,
IN PKEXCEPTION_FRAME ExceptionFrame,
IN OUT PCONTEXT ContextFrame
)
/*++
Routine Description:
This routine moves the selected contents of the specified trap and exception
frames into the specified context frame according to the specified context
flags.
Arguments:
TrapFrame - Supplies a pointer to a trap frame from which volatile context
should be copied into the context record.
ExceptionFrame - Supplies a pointer to an exception frame from which context
should be copied into the context record.
ContextFrame - Supplies a pointer to the context frame that receives the
context copied from the trap and exception frames.
Return Value:
None.
--*/
{
ULONGLONG IntNats1, IntNats2;
USHORT R1Offset, R4Offset;
USHORT RNatSaveIndex;
SHORT BsFrameSize;
SHORT TempFrameSize;
// Set control information if specified.
if ((ContextFrame->ContextFlags & CONTEXT_CONTROL) == CONTEXT_CONTROL) {
ContextFrame->IntGp = TrapFrame->IntGp;
ContextFrame->IntSp = TrapFrame->IntSp;
ContextFrame->ApUNAT = TrapFrame->ApUNAT;
ContextFrame->BrRp = TrapFrame->BrRp;
ContextFrame->ApCCV = TrapFrame->ApCCV;
ContextFrame->ApDCR = TrapFrame->ApDCR;
ContextFrame->StFPSR = TrapFrame->StFPSR;
ContextFrame->StIPSR = TrapFrame->StIPSR;
ContextFrame->StIIP = TrapFrame->StIIP;
ContextFrame->StIFS = TrapFrame->StIFS;
// Set RSE control states from the trap frame.
ContextFrame->RsPFS = TrapFrame->RsPFS;
BsFrameSize = (SHORT)(TrapFrame->StIFS & PFS_SIZE_MASK);
RNatSaveIndex = (USHORT) (TrapFrame->RsBSP >> 3) & NAT_BITS_PER_RNAT_REG;
TempFrameSize = BsFrameSize - RNatSaveIndex;
while (TempFrameSize > 0) {
BsFrameSize++;
TempFrameSize -= NAT_BITS_PER_RNAT_REG;
}
ContextFrame->RsBSP = TrapFrame->RsBSP - BsFrameSize * 8;
ContextFrame->RsBSPSTORE = ContextFrame->RsBSP;
ContextFrame->RsRSC = TrapFrame->RsRSC;
ContextFrame->RsRNAT = TrapFrame->RsRNAT;
#if DEBUG
DbgPrint("KeContextFromKFrames: RsRNAT = 0x%I64x\n",
ContextFrame->RsRNAT);
#endif // DEBUG
// Set preserved applicaton registers from exception frame.
ContextFrame->ApLC = ExceptionFrame->ApLC;
ContextFrame->ApEC = (ExceptionFrame->ApEC >> PFS_EC_SHIFT) & PFS_EC_MASK;
// Get iA status from the application registers
ContextFrame->StFCR = __getReg(CV_IA64_AR21);
ContextFrame->Eflag = __getReg(CV_IA64_AR24);
ContextFrame->SegCSD = __getReg(CV_IA64_AR25);
ContextFrame->SegSSD = __getReg(CV_IA64_AR26);
ContextFrame->Cflag = __getReg(CV_IA64_AR27);
ContextFrame->StFSR = __getReg(CV_IA64_AR28);
ContextFrame->StFIR = __getReg(CV_IA64_AR29);
ContextFrame->StFDR = __getReg(CV_IA64_AR30);
}
// Set integer register contents if specified.
if ((ContextFrame->ContextFlags & CONTEXT_INTEGER) == CONTEXT_INTEGER) {
ContextFrame->IntT0 = TrapFrame->IntT0;
ContextFrame->IntT1 = TrapFrame->IntT1;
ContextFrame->IntT2 = TrapFrame->IntT2;
ContextFrame->IntT3 = TrapFrame->IntT3;
ContextFrame->IntT4 = TrapFrame->IntT4;
ContextFrame->IntV0 = TrapFrame->IntV0;
ContextFrame->IntTeb = TrapFrame->IntTeb;
ContextFrame->Preds = TrapFrame->Preds;
// t5 - t22
memcpy(&ContextFrame->IntT5, &TrapFrame->IntT5, 18*sizeof(ULONGLONG));
// Set branch registers from trap frame & exception frame
ContextFrame->BrT0 = TrapFrame->BrT0;
ContextFrame->BrT1 = TrapFrame->BrT1;
memcpy(&ContextFrame->BrS0, &ExceptionFrame->BrS0, 5*sizeof(ULONGLONG));
// Set integer registers s0 - s3 from exception frame.
ContextFrame->IntS0 = ExceptionFrame->IntS0;
ContextFrame->IntS1 = ExceptionFrame->IntS1;
ContextFrame->IntS2 = ExceptionFrame->IntS2;
ContextFrame->IntS3 = ExceptionFrame->IntS3;
// Set the integer nats field in the context
R1Offset = (USHORT)((ULONG_PTR)(&TrapFrame->IntGp) >> 3) & 0x3f;
R4Offset = (USHORT)((ULONG_PTR)(&ExceptionFrame->IntS0) >> 3) & 0x3f;
ALIGN_NATS(IntNats1, TrapFrame->IntNats, 1, R1Offset, 0xFFFFFF0E);
ALIGN_NATS(IntNats2, ExceptionFrame->IntNats, 4, R4Offset, 0xF0);
ContextFrame->IntNats = IntNats1 | IntNats2;
#if DEBUG
DbgPrint("KeContextFromKFrames: TF->IntNats = 0x%I64x, R1OffSet = 0x%x, R4Offset = 0x%x\n",
TrapFrame->IntNats, R1Offset, R4Offset);
DbgPrint("KeContextFromKFrames: CF->IntNats = 0x%I64x, IntNats1 = 0x%I64x, IntNats2 = 0x%I64x\n",
ContextFrame->IntNats, IntNats1, IntNats2);
#endif // DEBUG
}
// Set lower floating register contents if specified.
if ((ContextFrame->ContextFlags & CONTEXT_LOWER_FLOATING_POINT) == CONTEXT_LOWER_FLOATING_POINT) {
// Set EM + ia32 FP status
ContextFrame->StFPSR = TrapFrame->StFPSR;
// Set floating registers fs0 - fs19 from exception frame.
RtlCopyIa64FloatRegisterContext(&ContextFrame->FltS0,
&ExceptionFrame->FltS0,
sizeof(FLOAT128) * (4));
RtlCopyIa64FloatRegisterContext(&ContextFrame->FltS4,
&ExceptionFrame->FltS4,
16*sizeof(FLOAT128));
// Set floating registers ft0 - ft9 from trap frame.
RtlCopyIa64FloatRegisterContext(&ContextFrame->FltT0,
&TrapFrame->FltT0,
sizeof(FLOAT128) * (10));
}
if ((ContextFrame->ContextFlags & CONTEXT_HIGHER_FLOATING_POINT) == CONTEXT_HIGHER_FLOATING_POINT) {
ContextFrame->StFPSR = TrapFrame->StFPSR;
// Set floating regs f32 - f127 from higher floating point save area
if (TrapFrame->PreviousMode == UserMode) {
RtlCopyIa64FloatRegisterContext(
&ContextFrame->FltF32,
(PFLOAT128)GET_HIGH_FLOATING_POINT_REGISTER_SAVEAREA(),
96*sizeof(FLOAT128)
);
}
}
// Get user debug registers from save area in kernel stack.
// Note: PSR.db must be set to activate the debug registers.
if ((ContextFrame->ContextFlags & CONTEXT_DEBUG) == CONTEXT_DEBUG) {
KiGetDebugContext(TrapFrame, ContextFrame);
}
return;
}
VOID
KeContextToKframes (
IN OUT PKTRAP_FRAME TrapFrame,
IN OUT PKEXCEPTION_FRAME ExceptionFrame,
IN PCONTEXT ContextFrame,
IN ULONG ContextFlags,
IN KPROCESSOR_MODE PreviousMode
)
/*++
Routine Description:
This routine moves the selected contents of the specified context frame into
the specified trap and exception frames according to the specified context
flags.
Arguments:
TrapFrame - Supplies a pointer to a trap frame that receives the volatile
context from the context record.
ExceptionFrame - Supplies a pointer to an exception frame that receives
the nonvolatile context from the context record.
ContextFrame - Supplies a pointer to a context frame that contains the
context that is to be copied into the trap and exception frames.
ContextFlags - Supplies the set of flags that specify which parts of the
context frame are to be copied into the trap and exception frames.
PreviousMode - Supplies the processor mode for which the trap and exception
frames are being built.
Return Value:
None.
--*/
{
USHORT R1Offset, R4Offset;
USHORT RNatSaveIndex;
SHORT BsFrameSize;
SHORT TempFrameSize;
// Set control information if specified.
if ((ContextFlags & CONTEXT_CONTROL) == CONTEXT_CONTROL) {
TrapFrame->IntGp = ContextFrame->IntGp;
TrapFrame->IntSp = ContextFrame->IntSp;
TrapFrame->ApUNAT = ContextFrame->ApUNAT;
TrapFrame->BrRp = ContextFrame->BrRp;
TrapFrame->ApCCV = ContextFrame->ApCCV;
TrapFrame->ApDCR = SANITIZE_DCR(ContextFrame->ApDCR, PreviousMode);
// Set preserved applicaton registers in exception frame.
ExceptionFrame->ApLC = ContextFrame->ApLC;
ExceptionFrame->ApEC &= ~(PFS_EC_MASK << PFS_EC_MASK);
ExceptionFrame->ApEC |= ((ContextFrame->ApEC & PFS_EC_MASK) << PFS_EC_SHIFT);
// Set RSE control states in the trap frame.
TrapFrame->RsPFS = ContextFrame->RsPFS;
BsFrameSize = (SHORT)(ContextFrame->StIFS & PFS_SIZE_MASK);
RNatSaveIndex = (USHORT)((ContextFrame->RsBSP >> 3) & NAT_BITS_PER_RNAT_REG);
TempFrameSize = RNatSaveIndex + BsFrameSize - NAT_BITS_PER_RNAT_REG;
while (TempFrameSize >= 0) {
BsFrameSize++;
TempFrameSize -= NAT_BITS_PER_RNAT_REG;
}
TrapFrame->RsBSPSTORE = ContextFrame->RsBSPSTORE + BsFrameSize * 8;
TrapFrame->RsBSP = TrapFrame->RsBSPSTORE;
TrapFrame->RsRSC = ContextFrame->RsRSC;
TrapFrame->RsRNAT = ContextFrame->RsRNAT;
#if DEBUG
DbgPrint("KeContextToKFrames: RsRNAT = 0x%I64x\n", TrapFrame->RsRNAT);
#endif // DEBUG
// Set FPSR, IPSR, IIP, and IFS in the trap frame.
TrapFrame->StFPSR = SANITIZE_FSR(ContextFrame->StFPSR, PreviousMode);
TrapFrame->StIPSR = SANITIZE_PSR(ContextFrame->StIPSR, PreviousMode);
if (((TrapFrame->StIPSR >> PSR_RI) & 3) == 3) {
TrapFrame->StIPSR &= ~(3i64 << PSR_RI);
}
TrapFrame->StIFS = SANITIZE_IFS(ContextFrame->StIFS, PreviousMode);
TrapFrame->StIIP = ContextFrame->StIIP;
// DebugActive controls h/w debug registers. Set if new psr.db = 1
KeGetCurrentThread()->DebugActive = ((TrapFrame->StIPSR & (1I64 << PSR_DB)) != 0);
// Set application registers directly
// *** TBD SANATIZE??
if (PreviousMode == UserMode ) {
__setReg(CV_IA64_AR21, ContextFrame->StFCR);
__setReg(CV_IA64_AR24, ContextFrame->Eflag);
__setReg(CV_IA64_AR25, ContextFrame->SegCSD);
__setReg(CV_IA64_AR26, ContextFrame->SegSSD);
__setReg(CV_IA64_AR27, ContextFrame->Cflag);
__setReg(CV_IA64_AR28, ContextFrame->StFSR);
__setReg(CV_IA64_AR29, ContextFrame->StFIR);
__setReg(CV_IA64_AR30, ContextFrame->StFDR);
}
}
// Set integer registers contents if specified.
if ((ContextFlags & CONTEXT_INTEGER) == CONTEXT_INTEGER) {
TrapFrame->IntT0 = ContextFrame->IntT0;
TrapFrame->IntT1 = ContextFrame->IntT1;
TrapFrame->IntT2 = ContextFrame->IntT2;
TrapFrame->IntT3 = ContextFrame->IntT3;
TrapFrame->IntT4 = ContextFrame->IntT4;
TrapFrame->IntV0 = ContextFrame->IntV0;
TrapFrame->IntTeb = ContextFrame->IntTeb;
TrapFrame->Preds = ContextFrame->Preds;
// t5 - t22
memcpy(&TrapFrame->IntT5, &ContextFrame->IntT5, 18*sizeof(ULONGLONG));
// Set integer registers s0 - s3 in exception frame.
ExceptionFrame->IntS0 = ContextFrame->IntS0;
ExceptionFrame->IntS1 = ContextFrame->IntS1;
ExceptionFrame->IntS2 = ContextFrame->IntS2;
ExceptionFrame->IntS3 = ContextFrame->IntS3;
// Set the integer nats field in the trap & exception frames
R1Offset = (USHORT)((ULONG_PTR)(&TrapFrame->IntGp) >> 3) & 0x3f;
R4Offset = (USHORT)((ULONG_PTR)(&ExceptionFrame->IntS0) >> 3) & 0x3f;
EXTRACT_NATS(TrapFrame->IntNats, ContextFrame->IntNats,
1, R1Offset, 0xFFFFFF0E);
EXTRACT_NATS(ExceptionFrame->IntNats, ContextFrame->IntNats,
4, R4Offset, 0xF0);
#if DEBUG
DbgPrint("KeContextToKFrames: TF->IntNats = 0x%I64x, ContestFrame->IntNats = 0x%I64x, R1OffSet = 0x%x\n",
TrapFrame->IntNats, ContextFrame->IntNats, R1Offset);
DbgPrint("KeContextToKFrames: EF->IntNats = 0x%I64x, R4OffSet = 0x%x\n",
ExceptionFrame->IntNats, R4Offset);
#endif // DEBUG
// Set other branch registers in trap and exception frames
TrapFrame->BrT0 = ContextFrame->BrT0;
TrapFrame->BrT1 = ContextFrame->BrT1;
memcpy(&ExceptionFrame->BrS0, &ContextFrame->BrS0, 5*sizeof(ULONGLONG));
}
// Set lower floating register contents if specified.
if ((ContextFlags & CONTEXT_LOWER_FLOATING_POINT) == CONTEXT_LOWER_FLOATING_POINT) {
TrapFrame->StFPSR = SANITIZE_FSR(ContextFrame->StFPSR, PreviousMode);
// Set floating registers fs0 - fs19 in exception frame.
RtlCopyIa64FloatRegisterContext(&ExceptionFrame->FltS0,
&ContextFrame->FltS0,
sizeof(FLOAT128) * (4));
RtlCopyIa64FloatRegisterContext(&ExceptionFrame->FltS4,
&ContextFrame->FltS4,
16*sizeof(FLOAT128));
// Set floating registers ft0 - ft9 in trap frame.
RtlCopyIa64FloatRegisterContext(&TrapFrame->FltT0,
&ContextFrame->FltT0,
sizeof(FLOAT128) * (10));
}
// Set higher floating register contents if specified.
if ((ContextFlags & CONTEXT_HIGHER_FLOATING_POINT) == CONTEXT_HIGHER_FLOATING_POINT) {
TrapFrame->StFPSR = SANITIZE_FSR(ContextFrame->StFPSR, PreviousMode);
if (PreviousMode == UserMode) {
// Update the higher floating point save area (f32-f127) and
// set the corresponding modified bit in the PSR to 1.
RtlCopyIa64FloatRegisterContext(
(PFLOAT128)GET_HIGH_FLOATING_POINT_REGISTER_SAVEAREA(),
&ContextFrame->FltF32,
96*sizeof(FLOAT128)
);
TrapFrame->StIPSR |= (1i64 << PSR_DFH);
}
}
// Set debug registers.
if ((ContextFlags & CONTEXT_DEBUG) == CONTEXT_DEBUG) {
KiSetDebugContext (TrapFrame, ContextFrame, PreviousMode);
}
return;
}
VOID
KiFlushUserRseState (
IN PKTRAP_FRAME TrapFrame
)
/*++
Routine Description:
This routine flushes the user rse state from the kernel backing store to the
user backing store. The user context frame is update to reflect the new
context state.
Arguments:
TrapFrame - Supplies a pointer to a trap frame.
Return Value:
None.
--*/
{
SHORT BsFrameSize;
SHORT RNatSaveIndex;
SHORT Temp;
USHORT TearPointOffset;
ULONGLONG TopBound, BottomBound;
ULONGLONG UserRnats1, UserRnats2;
ULONGLONG Mask;
// Copy user stacked registers' contents to user backing store.
// N.B. Stack overflow could happen.
try {
BsFrameSize = (SHORT)(TrapFrame->RsBSP - TrapFrame->RsBSPSTORE);
if (BsFrameSize) {
ULONGLONG Bsp, Rnat, KernelInitBsp;
// Copy the dirty stacked registers back into the
// user backing store
RtlpFlushRSE(&Bsp, &Rnat);
TearPointOffset = (USHORT) TrapFrame->RsBSPSTORE & 0x1F8;
KernelInitBsp= (PCR->InitialBStore | TearPointOffset) + BsFrameSize;
if ((KernelInitBsp | RNAT_ALIGNMENT) != (Bsp | RNAT_ALIGNMENT)) {
Rnat = *(PULONGLONG)(KernelInitBsp | RNAT_ALIGNMENT);
}
RtlCopyMemory((PVOID)(TrapFrame->RsBSPSTORE),
(PVOID)(PCR->InitialBStore + TearPointOffset),
BsFrameSize);
TopBound = TrapFrame->RsBSP | RNAT_ALIGNMENT;
BottomBound = TrapFrame->RsBSPSTORE | RNAT_ALIGNMENT;
RNatSaveIndex = TearPointOffset >> 3;
Mask = (((1ULL << (NAT_BITS_PER_RNAT_REG - RNatSaveIndex)) - 1) << RNatSaveIndex);
UserRnats1 = TrapFrame->RsRNAT & ((1ULL << RNatSaveIndex) - 1);
if (TopBound > BottomBound) {
// user dirty stacked GR span across at least one RNAT
// boundary; need to deposit the valid RNAT bits from
// the trap frame into the kernel backing store. Also,
// the RNAT field in the trap frame has to be updated.
UserRnats2 = *(PULONGLONG)BottomBound & Mask;
*(PULONGLONG)BottomBound = UserRnats1 | UserRnats2;
TrapFrame->RsRNAT = Rnat;
#if DEBUG
DbgPrint("KiFlushUserRseState 1: UserRnats1 = 0x%I64x, UserRnats2 = 0x%I64x, TF->RsRNAT = 0x%I64x\n",
UserRnats1, UserRnats2, TrapFrame->RsRNAT);
#endif // DEBUG
} else {
// user stacked register region does not span across an
// RNAT boundary; combine the RNAT fields from both the
// trap frame and the context frame.
UserRnats2 = Rnat & Mask;
TrapFrame->RsRNAT = UserRnats1 | UserRnats2;
#if DEBUG
DbgPrint("KiFlushUserRseState 2: UserRnats1 = 0x%I64x, UserRnats2 = 0x%I64x, TF->RsRNAT = 0x%I64x\n",
UserRnats1, UserRnats2, TrapFrame->RsRNAT);
#endif // DEBUG
}
}
// Successfully copied to user backing store; set the user's
// bspstore to the value of its own bsp.
TrapFrame->RsBSPSTORE = TrapFrame->RsBSP;
} except (EXCEPTION_EXECUTE_HANDLER) {
DbgPrint("WARNING: Exception raised in krnl-to-user bstore copy\n");
}
return;
}
VOID
KeContextToKframesSpecial (
IN PKTHREAD Thread,
IN OUT PKTRAP_FRAME TrapFrame,
IN OUT PKEXCEPTION_FRAME ExceptionFrame,
IN PCONTEXT ContextFrame,
IN ULONG ContextFlags
)
/*++
Routine Description:
This routine moves the selected contents of the specified context frame into
the specified trap and exception frames according to the specified context
flags.
Arguments:
TrapFrame - Supplies a pointer to a trap frame that receives the volatile
context from the context record.
ExceptionFrame - Supplies a pointer to an exception frame that receives
the nonvolatile context from the context record.
ContextFrame - Supplies a pointer to a context frame that contains the
context that is to be copied into the trap and exception frames.
ContextFlags - Supplies the set of flags that specify which parts of the
context frame are to be copied into the trap and exception frames.
PreviousMode - Supplies the processor mode for which the trap and exception
frames are being built.
Return Value:
None.
--*/
{
USHORT R1Offset, R4Offset;
USHORT RNatSaveIndex;
SHORT BsFrameSize;
SHORT TempFrameSize;
// Set control information if specified.
if ((ContextFlags & CONTEXT_CONTROL) == CONTEXT_CONTROL) {
TrapFrame->IntGp = ContextFrame->IntGp;
TrapFrame->IntSp = ContextFrame->IntSp;
TrapFrame->ApUNAT = ContextFrame->ApUNAT;
TrapFrame->BrRp = ContextFrame->BrRp;
TrapFrame->ApCCV = ContextFrame->ApCCV;
TrapFrame->ApDCR = SANITIZE_DCR(ContextFrame->ApDCR, UserMode);
// Set preserved applicaton registers in exception frame.
ExceptionFrame->ApLC = ContextFrame->ApLC;
ExceptionFrame->ApEC &= ~(PFS_EC_MASK << PFS_EC_MASK);
ExceptionFrame->ApEC |= ((ContextFrame->ApEC & PFS_EC_MASK) << PFS_EC_SHIFT);
// Set RSE control states in the trap frame.
TrapFrame->RsPFS = ContextFrame->RsPFS;
BsFrameSize = (SHORT)(ContextFrame->StIFS & PFS_SIZE_MASK);
RNatSaveIndex = (USHORT)((ContextFrame->RsBSP >> 3) & NAT_BITS_PER_RNAT_REG);
TempFrameSize = RNatSaveIndex + BsFrameSize - NAT_BITS_PER_RNAT_REG;
while (TempFrameSize >= 0) {
BsFrameSize++;
TempFrameSize -= NAT_BITS_PER_RNAT_REG;
}
TrapFrame->RsBSPSTORE = ContextFrame->RsBSPSTORE + BsFrameSize * 8;
TrapFrame->RsBSP = TrapFrame->RsBSPSTORE;
TrapFrame->RsRSC = ContextFrame->RsRSC;
TrapFrame->RsRNAT = ContextFrame->RsRNAT;
#if DEBUG
DbgPrint("KeContextToKFrames: RsRNAT = 0x%I64x\n", TrapFrame->RsRNAT);
#endif // DEBUG
// Set FPSR, IPSR, IIP, and IFS in the trap frame.
TrapFrame->StFPSR = SANITIZE_FSR(ContextFrame->StFPSR, UserMode);
TrapFrame->StIPSR = SANITIZE_PSR(ContextFrame->StIPSR, UserMode);
if (((TrapFrame->StIPSR >> PSR_RI) & 3) == 3) {
TrapFrame->StIPSR &= ~(3i64 << PSR_RI);
}
TrapFrame->StIFS = SANITIZE_IFS(ContextFrame->StIFS, UserMode);
TrapFrame->StIIP = ContextFrame->StIIP;
// DebugActive controls h/w debug registers. Set if new psr.db = 1
KeGetCurrentThread()->DebugActive = ((TrapFrame->StIPSR & (1I64 << PSR_DB)) != 0);
// Set application registers directly
if (Thread == KeGetCurrentThread()) {
__setReg(CV_IA64_AR21, ContextFrame->StFCR);
__setReg(CV_IA64_AR24, ContextFrame->Eflag);
__setReg(CV_IA64_AR25, ContextFrame->SegCSD);
__setReg(CV_IA64_AR26, ContextFrame->SegSSD);
__setReg(CV_IA64_AR27, ContextFrame->Cflag);
__setReg(CV_IA64_AR28, ContextFrame->StFSR);
__setReg(CV_IA64_AR29, ContextFrame->StFIR);
__setReg(CV_IA64_AR30, ContextFrame->StFDR);
} else {
PKAPPLICATION_REGISTERS AppRegs;
AppRegs = GET_APPLICATION_REGISTER_SAVEAREA(Thread->StackBase);
AppRegs->Ar21 = ContextFrame->StFCR;
AppRegs->Ar24 = ContextFrame->Eflag;
AppRegs->Ar25 = ContextFrame->SegCSD;
AppRegs->Ar26 = ContextFrame->SegSSD;
AppRegs->Ar27 = ContextFrame->Cflag;
AppRegs->Ar28 = ContextFrame->StFSR;
AppRegs->Ar29 = ContextFrame->StFIR;
AppRegs->Ar30 = ContextFrame->StFDR;
}
}
// Set integer registers contents if specified.
if ((ContextFlags & CONTEXT_INTEGER) == CONTEXT_INTEGER) {
TrapFrame->IntT0 = ContextFrame->IntT0;
TrapFrame->IntT1 = ContextFrame->IntT1;
TrapFrame->IntT2 = ContextFrame->IntT2;
TrapFrame->IntT3 = ContextFrame->IntT3;
TrapFrame->IntT4 = ContextFrame->IntT4;
TrapFrame->IntV0 = ContextFrame->IntV0;
TrapFrame->IntTeb = ContextFrame->IntTeb;
TrapFrame->Preds = ContextFrame->Preds;
// t5 - t22
memcpy(&TrapFrame->IntT5, &ContextFrame->IntT5, 18*sizeof(ULONGLONG));
// Set integer registers s0 - s3 in exception frame.
ExceptionFrame->IntS0 = ContextFrame->IntS0;
ExceptionFrame->IntS1 = ContextFrame->IntS1;
ExceptionFrame->IntS2 = ContextFrame->IntS2;
ExceptionFrame->IntS3 = ContextFrame->IntS3;
// Set the integer nats field in the trap & exception frames
R1Offset = (USHORT)((ULONG_PTR)(&TrapFrame->IntGp) >> 3) & 0x3f;
R4Offset = (USHORT)((ULONG_PTR)(&ExceptionFrame->IntS0) >> 3) & 0x3f;
EXTRACT_NATS(TrapFrame->IntNats, ContextFrame->IntNats,
1, R1Offset, 0xFFFFFF0E);
EXTRACT_NATS(ExceptionFrame->IntNats, ContextFrame->IntNats,
4, R4Offset, 0xF0);
#if DEBUG
DbgPrint("KeContextToKFrames: TF->IntNats = 0x%I64x, ContestFrame->IntNats = 0x%I64x, R1OffSet = 0x%x\n",
TrapFrame->IntNats, ContextFrame->IntNats, R1Offset);
DbgPrint("KeContextToKFrames: EF->IntNats = 0x%I64x, R4OffSet = 0x%x\n",
ExceptionFrame->IntNats, R4Offset);
#endif // DEBUG
// Set other branch registers in trap and exception frames
TrapFrame->BrT0 = ContextFrame->BrT0;
TrapFrame->BrT1 = ContextFrame->BrT1;
memcpy(&ExceptionFrame->BrS0, &ContextFrame->BrS0, 5*sizeof(ULONGLONG));
}
// Set lower floating register contents if specified.
if ((ContextFlags & CONTEXT_LOWER_FLOATING_POINT) == CONTEXT_LOWER_FLOATING_POINT) {
TrapFrame->StFPSR = SANITIZE_FSR(ContextFrame->StFPSR, UserMode);
// Set floating registers fs0 - fs19 in exception frame.
RtlCopyIa64FloatRegisterContext(&ExceptionFrame->FltS0,
&ContextFrame->FltS0,
sizeof(FLOAT128) * (4));
RtlCopyIa64FloatRegisterContext(&ExceptionFrame->FltS4,
&ContextFrame->FltS4,
16*sizeof(FLOAT128));
// Set floating registers ft0 - ft9 in trap frame.
RtlCopyIa64FloatRegisterContext(&TrapFrame->FltT0,
&ContextFrame->FltT0,
sizeof(FLOAT128) * (10));
}
// Set higher floating register contents if specified.
if ((ContextFlags & CONTEXT_HIGHER_FLOATING_POINT) == CONTEXT_HIGHER_FLOATING_POINT) {
TrapFrame->StFPSR = SANITIZE_FSR(ContextFrame->StFPSR, UserMode);
// Update the higher floating point save area (f32-f127) and
// set the corresponding modified bit in the PSR to 1.
RtlCopyIa64FloatRegisterContext(
(PFLOAT128)GET_HIGH_FLOATING_POINT_REGISTER_SAVEAREA(),
&ContextFrame->FltF32,
96*sizeof(FLOAT128)
);
TrapFrame->StIPSR |= (1i64 << PSR_DFH);
}
// Set debug registers.
if ((ContextFlags & CONTEXT_DEBUG) == CONTEXT_DEBUG) {
KiSetDebugContext (TrapFrame, ContextFrame, UserMode);
}
return;
}
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