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//++//// Copyright (c) 1994 Microsoft Corporation//// Module Name://// callout.s//// Abstract://// This module implements the code necessary to call out from kernel// mode to user mode.//// Author://// William K. Cheung (wcheung) 30-Oct-1995//// Environment://// Kernel mode only.//// Revision History:////--
#include "ksia64.h"
PublicFunction(MmGrowKernelStack) PublicFunction(MmGrowKernelBackingStore) PublicFunction(KiUserServiceExit) PublicFunction(KiApcInterrupt) PublicFunction(RtlMoveMemory)
.global KeUserCallbackDispatcher
//++//// NTSTATUS// KiCallUserMode (// IN PVOID *OutputBuffer,// IN PULONG OutputLength// )//// Routine Description://// This function calls a user mode function.//// N.B. This function calls out to user mode and the NtCallbackReturn// function returns back to the caller of this function. Therefore,// the stack layout must be consistent between the two routines.//// Arguments://// OutputBuffer (a0) - Supplies a pointer to the variable that receivies// the address of the output buffer.//// OutputLength (a1) - Supplies a pointer to a variable that receives// the length of the output buffer.//// Return Value://// The final status of the call out function is returned as the status// of the function.//// N.B. This function does not return to its caller. A return to the// caller is executed when a NtCallbackReturn system service is// executed.//// N.B. This function does return to its caller if a kernel stack// expansion is required and the attempted expansion fails.//// The instruction that restores the sp (i.e. epilogue) must be// in the last bundle of the function. This is a convention// by which this functin must abide or the stack unwinder in the// imagehlp DLL will not work.////--
NESTED_ENTRY(KiCallUserMode)
.regstk 2, 8, 2, 0 .prologue
rT0 = t0 rT1 = t1 rT2 = t2 rT3 = t3 rT4 = t4 rT5 = t5 rT6 = t6 rT7 = t7
rpT0 = t10 rpT1 = t11 rpT2 = t12 rpT3 = t13 rpT4 = t14 rpT5 = t15 rpT6 = t16
rpCurTh = loc0 rbsp = loc1 rbspInit = loc2 rpTF = loc7
// // following 3 register aliases are copied from trap.s //
pUser = ps1 // mode on entry was user pKrnl = ps2 // mode on entry was kernel pUDbg = ps8 // Kernel debug Active
//// allocate stack frame to save preserved floating point registers//
alloc rT1 = ar.pfs, 2, 8, 2, 0 mov rT0 = ar.unat mov rT2 = brp
//// save both preserved integer and float registers//
add rpT1 = -CuFrameLength+CuBrRp+STACK_SCRATCH_AREA, sp add rpT2 = -CuFrameLength+CuRsPFS+STACK_SCRATCH_AREA, sp .fframe CuFrameLength add sp = -CuFrameLength, sp ;;
.savesp brp, CuBrRp+STACK_SCRATCH_AREA st8.nta [rpT1] = rT2, CuPreds - CuBrRp // save rp .savesp ar.pfs, CuRsPFS+STACK_SCRATCH_AREA st8.nta [rpT2] = rT1, CuApUNAT - CuRsPFS // save pfs mov rT3 = pr ;;
.savesp pr, CuPreds+STACK_SCRATCH_AREA st8.nta [rpT1] = rT3, CuApLC - CuPreds // save predicates .savesp ar.unat, CuApUNAT+ STACK_SCRATCH_AREA st8.nta [rpT2] = rT0, CuIntS0 - CuApUNAT // save ar.unat mov rT4 = ar.lc ;;
.savesp ar.lc, CuApLC+STACK_SCRATCH_AREA st8.nta [rpT1] = rT4, CuIntS1 - CuApLC // save ar.lc st8.spill.nta [rpT2] = s0, CuIntS2 - CuIntS0 // save s0 mov rT0 = bs0 ;;
.mem.offset 0,0 st8.spill.nta [rpT1] = s1, CuIntS3 - CuIntS1 // save s1 .mem.offset 8,0 st8.spill.nta [rpT2] = s2, CuBrS0 - CuIntS2 // save s2 mov rT1 = bs1 ;;
st8.spill.nta [rpT1] = s3, CuBrS1 - CuIntS3 // save s3 st8.nta [rpT2] = rT0, CuBrS2 - CuBrS0 // save bs0 mov rT2 = bs2 ;;
flushrs mov ar.rsc = r0 // put RSE in lazy mode mov rT6 = ar.unat ;;
mov rT5 = ar.rnat mov rT3 = bs3 ;;
st8.nta [rpT1] = rT1, CuBrS3 - CuBrS1 // save bs1 st8.nta [rpT2] = rT2, CuBrS4 - CuBrS2 // save bs2 mov rT4 = bs4 ;;
st8.nta [rpT1] = rT3, CuRsRNAT - CuBrS3 // save bs3 st8.nta [rpT2] = rT4, CuIntNats - CuBrS4 // save bs4 ;;
st8.nta [rpT1] = rT5, CuFltS0 - CuRsRNAT // save rnat st8.nta [rpT2] = rT6, CuFltS1 - CuIntNats // save NaTs ;;
stf.spill.nta [rpT1] = fs0, CuFltS2 - CuFltS0 // save fs0 stf.spill.nta [rpT2] = fs1, CuFltS3 - CuFltS1 // save fs1 mov v0 = zero // set v0 to 0 ;;
stf.spill.nta [rpT1] = fs2, CuFltS4 - CuFltS2 // save fs2 stf.spill.nta [rpT2] = fs3, CuFltS5 - CuFltS3 // save fs3 ;;
stf.spill.nta [rpT1] = fs4, CuFltS6 - CuFltS4 // save fs4 stf.spill.nta [rpT2] = fs5, CuFltS7 - CuFltS5 // save fs5 nop.i 0 ;;
stf.spill.nta [rpT1] = fs6, CuFltS8 - CuFltS6 // save fs6 stf.spill.nta [rpT2] = fs7, CuFltS9 - CuFltS7 // save fs7 nop.i 0 ;;
stf.spill.nta [rpT1] = fs8, CuFltS10 - CuFltS8 // save fs8 stf.spill.nta [rpT2] = fs9, CuFltS11 - CuFltS9 // save fs9 nop.i 0 ;;
stf.spill.nta [rpT1] = fs10, CuFltS12 - CuFltS10 // save fs10 stf.spill.nta [rpT2] = fs11, CuFltS13 - CuFltS11 // save fs11 nop.i 0 ;;
stf.spill.nta [rpT1] = fs12, CuFltS14 - CuFltS12 // save fs12 stf.spill.nta [rpT2] = fs13, CuFltS15 - CuFltS13 // save fs13 nop.i 0 ;;
stf.spill.nta [rpT1] = fs14, CuFltS16 - CuFltS14 // save fs14 stf.spill.nta [rpT2] = fs15, CuFltS17 - CuFltS15 // save fs15 nop.i 0 ;;
stf.spill.nta [rpT1] = fs16, CuFltS18 - CuFltS16 // save fs16 stf.spill.nta [rpT2] = fs17, CuFltS19 - CuFltS17 // save fs17 nop.i 0 ;;
stf.spill.nta [rpT1] = fs18, CuA0 - CuFltS18 // save fs18 stf.spill.nta [rpT2] = fs19, CuA1 - CuFltS19 // save fs19 nop.i 0 ;;
PROLOGUE_END
//// Check if sufficient rooms are available on both the kernel// memory stack and backing store for another system call.// Call the MM functions to grow them if necessary.//
mov rbsp = ar.bsp movl loc3 = KiPcr + PcCurrentThread
st8.nta [rpT1] = a0 st8.nta [rpT2] = a1 mov rT2 = 0x1ff ;;
add rbspInit = 0x200, rbsp mov rT0 = sp ;;
andcm rbspInit = rbspInit, rT2 ;;
LDPTRINC (rpCurTh, loc3, PcStackLimit - PcCurrentThread) add rT0 = -KERNEL_LARGE_STACK_COMMIT, rT0 mov rT1 = rbspInit ;;
add loc4 = ThStackLimit, rpCurTh add loc5 = ThBStoreLimit, rpCurTh add rT1 = KERNEL_LARGE_BSTORE_COMMIT, rT1 ;;
//// check if it is necessary to grow the kernel stack and backing store//
LDPTR (rT2, loc4) // Get current stack limit. LDPTR (rT3, loc5) // Get current bstore limit mov out0 = sp ;;
cmp.ge ps0 = rT2, rT0 cmp.ge ps1 = rT1, rT3(ps0) br.call.spnt.many brp = MmGrowKernelStack
//// Get expanded stack limit from thread object and set the stack limit// in PCR if the growth of kernel stack is successful.//
LDPTR (rT0, loc4) cmp4.ne pt2, pt1 = zero, v0 ;;
nop.m 0(pt1) st8 [loc3] = rT0, PcBStoreLimit - PcStackLimit(pt2) br.spnt Kcum10 ;;
mov out0 = rbspInit(ps1) br.call.spnt.many brp = MmGrowKernelBackingStore ;;
//// Get expanded bstore limit from thread object and set the bstore limit// in PCR if the growth of kernel backing store is successful.//
LDPTR (rT0, loc5) cmp4.ne pt2, pt1 = zero, v0 add loc4 = ThCallbackStack - ThStackLimit, loc4 add loc5 = ThCallbackBStore - ThBStoreLimit, loc5 ;;
rPcInStack = rT0 rPcInBStore = rT1 rThCbStack = rT2 rThCbBStore = rT3 rpLabel = rT4
PLDPTRINC (pt1, rThCbStack,loc4, ThTrapFrame - ThCallbackStack)(pt1) st8 [loc3] = rT0, PcInitialStack - PcBStoreLimit(pt2) br.spnt Kcum10 ;;
//// Get the address of the current thread and save the previous trap// frame and callback stack addresses in the current frame. Also// save the new callback stack address in the thread object.//// Get initial and callback stack & backing store addresses//
ld8.nt1 rPcInStack = [loc3], PcInitialBStore - PcInitialStack LDPTRINC (rpTF, loc4, ThCallbackStack - ThTrapFrame) add rpT1 = @gprel(KeUserCallbackDispatcher), gp ;;
ld8.nt1 rPcInBStore = [loc3], PcInitialStack-PcInitialBStore LDPTR (rThCbBStore, loc5) add rpT2 = CuInStack+STACK_SCRATCH_AREA, sp ;;
LDPTR (rpLabel, rpT1) add rpT5 = CuInBStore+STACK_SCRATCH_AREA, sp add loc6 = PcInitialBStore - PcInitialStack, loc3 ;;
STPTR (loc4, sp) // set callback stack addr STPTR (loc5, rbsp) // set callback bstore addr add loc4 = ThInitialStack - ThCallbackStack, loc4
//// save initial stack and backing store addresses//
st8.nta [rpT2] = rPcInStack, CuCbStk - CuInStack st8.nta [rpT5] = rPcInBStore, CuCbBStore - CuInBStore add loc5 = ThInitialBStore - ThCallbackBStore, loc5 ;;
//// save callback stack and backing store addresses//
st8.nta [rpT2] = rThCbStack, CuTrFrame - CuCbStk st8.nta [rpT5] = rThCbBStore, CuTrStIIP - CuCbBStore ;;
//// register aliases//
rpEntry=rT0 rIPSR=rT1 rIIP=rT2
rsm 1 << PSR_I // disable interrupts ;;
ld8.nt1 rpEntry = [rpLabel], 8 // get continuation IP st8.nta [rpT2] = rpTF // save trap frame address add rpT3 = TrStIIP, rpTF ;;
ld8.nt1 loc1 = [rpLabel] // get continuation GP add rpT2 = ThApcState+AsUserApcPending, rpCurTh ;;
ld8 rIIP = [rpT3], TrStIPSR-TrStIIP // get trap IIP ld1 rT3 = [rpT2], ThAlerted-ThApcState-AsUserApcPending ;;
ld8 rIPSR = [rpT3], TrStIIP-TrStIPSR add rpT1 = -ThreadStateSaveAreaLength-TrapFrameLength+TrStIPSR, sp cmp4.eq pt0 = zero, rT3 ;;
st8 [rpT3] = rpEntry // set trap IIP st8.nta [rpT5] = rIIP // save original IIP ;;
st8 [rpT1] = rIPSR tbit.nz pUDbg = rIPSR, PSR_DB // if psr.db set, load user DRs st1 [rpT2] = zero // Clear thread alearted
(pt0) mov gp = loc1 // Set user GP(pt0) br.sptk Kcum5 // no user apc pending, ;; // branch to KiUserServiceExit
FAST_ENABLE_INTERRUPTS mov out1 = APC_LEVEL ;;
SET_IRQL (out1) ;;
mov out1 = rpTF br.call.sptk brp = KiApcInterrupt ;;
FAST_DISABLE_INTERRUPTS SET_IRQL (zero) mov gp = loc1 // Set user GP ;;
Kcum5: st8.nta [loc4] = sp // reset initial stack addr st8.nta [loc3] = sp // reset initial stack addr cmp4.eq pUser, pKrnl = 0, r0 // preset predicates for // KiUserServiceExit // N.B. ps1 -- pUser // ps2 -- pKrnl
mov t0 = rpTF // set t0 -> trap frame address // per system call convention st8.nta [loc5] = rbspInit // reset initial bstore addr st8.nta [loc6] = rbspInit // reset initial bstore addr br KiUserServiceExit // per system call convention
//// An attempt to grow the kernel stack or backing store failed.//
Kcum10:
nop.m 0 add rpT1 = CuBrRp+STACK_SCRATCH_AREA, sp add rpT2 = CuRsPFS+STACK_SCRATCH_AREA, sp ;;
ld8.nt1 rT1 = [rpT1], CuPreds-CuBrRp ;;
ld8.nt1 rT2 = [rpT2] mov brp = rT1 ;;
ld8.nt1 rT3 = [rpT1] mov ar.pfs = rT2 ;;
mov pr = rT3, -1 ;;
.restore add sp = CuFrameLength, sp nop.i 0 br.ret.sptk.clr brp
NESTED_EXIT(KiCallUserMode)
//++//// PVOID// KeSwitchKernelStack (// IN PVOID StackBase,// IN PVOID StackLimit,// IN PVOID BStoreLimit// )//// Routine Description://// This function switches to the specified large kernel stack.//// N.B. This function can ONLY be called when there are no variables// in the stack that refer to other variables in the stack, i.e.,// there are no pointers into the stack.//// Arguments://// StackBase (a0) - Supplies a pointer to the base of the new kernel// stack.//// StackLimit (a1) - supplies a pointer to the limit of the new kernel// stack.//// BStoreLimit (a2) - supplies a pointer to the limit of the new kernel// backing store.//// Return Value://// The old kernel stack/backing store base is returned as the function value.////--
NESTED_ENTRY(KeSwitchKernelStack)
.regstk 3, 4, 3, 0 .prologue
// // register aliases //
rpCurTh = loc0 rThStackBase= loc1 rbsp = loc2 rT0 = t0 rT1 = t1 rT2 = t2 rT3 = t3 rT4 = t4 rT5 = t5 rT6 = t6 rT7 = t7 rpT0 = t10 rpT1 = t11 rpT2 = t12 rpT3 = t13 rpT4 = t14 rpT5 = t15 rpT6 = t16
alloc rT1 = ar.pfs, 3, 3, 3, 0 mov rpT3 = sp mov rT0 = brp ;;
mov rbsp = ar.bsp movl rpT0 = KiPcr+PcCurrentThread ;;
.fframe 16 flushrs add sp = -16, sp // allocate space for brp, pfs ;;
.savepsp brp, 0 LDPTR (rpCurTh, rpT0) st8 [rpT3] = rT0, 8 // save brp, pfs in old scratch area ;;
.savepsp ar.pfs, -8 st8 [rpT3] = rT1 add rpT1 = ThStackBase, rpCurTh add rpT2 = ThTrapFrame, rpCurTh ;;
PROLOGUE_END
LDPTR (rThStackBase, rpT1) LDPTR (rT2, rpT2) // get trap frame address mov out1 = sp ;;
//// relocate trap frame.// copy memory stack and backing store.//
sub rT1 = rThStackBase, rT2 ;;
sub out2 = rThStackBase, sp // compute the copy size sub rT2 = a0, rT1 ;;
STPTR (rpT2, rT2) // save new trap frame address sub out0 = a0, out2 (p0) br.call.sptk.many brp = RtlMoveMemory ;;
sub out2 = rbsp, rThStackBase mov out0 = a0 mov out1 = rThStackBase ;;
mov ar.rsc = r0 // put RSE in lazy mode mov rbsp = out2 (p0) br.call.sptk.many brp = RtlMoveMemory ;;
rsm 1 << PSR_I // disable interrupts mov rpT0 = rpCurTh sub rT1 = rThStackBase, sp
add rpT1 = ThInitialStack, rpCurTh add rpT2 = ThStackLimit, rpCurTh ;;
//// interrupt disabled, then update kernel stack/bstore base,// then switch kernel stack and backing store//
//// set new initial stack and stack base addresses in the kernel thread object.// set the return value to the old stack base address.//
STPTRINC (rpT1, a0, ThInitialBStore - ThInitialStack) STPTRINC (rpT2, a1, ThBStoreLimit - ThStackLimit) add rpT5 = 16, sp ;;
STPTR (rpT1, a0) STPTR (rpT2, a2) add rpT6 = 24, sp ;;
add rpT1 = ThStackBase, rpCurTh add rpT2 = ThLargeStack, rpCurTh add rT5 = 1, r0 ;;
STPTR (rpT1, a0) // save new stack/bstore base st1 [rpT2] = rT5 // large stack indicator nop.i 0
ld8 rT3 = [rpT5] // restore return pointer movl rpT3 = KiPcr+PcInitialStack ;;
ld8 rT4 = [rpT6] // restore pfs add rpT4 = PcStackLimit - PcInitialStack, rpT3 mov v0 = rThStackBase ;;
//// set new initial stack/bstore and their limits in the PCR//
st8 [rpT3] = a0, PcInitialBStore - PcInitialStack st8 [rpT4] = a1, PcBStoreLimit - PcStackLimit sub sp = a0, rT1 // switch to new kernel stack ;;
st8 [rpT3] = a0 st8 [rpT4] = a2 add rT2 = rbsp, a0 ;;
alloc rT5 = ar.pfs, 0, 0, 0, 0 ;;
mov rT6 = ar.rnat mov brp = rT3 ;;
loadrs ;;
mov ar.bspstore = rT2 // switch to new backing store mov ar.pfs = rT4 ;;
mov ar.rnat = rT6 ssm 1 << PSR_I // enable interrupt .restore add sp = 16, sp // deallocate stack frame ;;
invala mov ar.rsc = RSC_KERNEL ;;
br.ret.sptk.clr brp
NESTED_EXIT(KeSwitchKernelStack)
//++//// NTSTATUS// NtCallbackReturn (// IN PVOID OutputBuffer OPTIONAL,// IN ULONG OutputLength,// IN NTSTATUS Status// )//// Routine Description://// This function returns from a user mode callout to the kernel// mode caller of the user mode callback function.//// N.B. This function returns to the function that called out to user// mode and the KiCallUserMode function calls out to user mode.// Therefore, the stack layout must be consistent between the// two routines.//// t0 - current trap frame address//// Arguments://// OutputBuffer - Supplies an optional pointer to an output buffer.//// OutputLength - Supplies the length of the output buffer.//// Status - Supplies the status value returned to the caller of the// callback function.//// Return Value://// If the callback return cannot be executed, then an error status is// returned. Otherwise, the specified callback status is returned to// the caller of the callback function.//// N.B. This function returns to the function that called out to user// mode is a callout is currently active.////--
LEAF_ENTRY(NtCallbackReturn)
.regstk 3, 1, 0, 0
rT0 = t1 rT1 = t2 rT2 = t3 rT3 = t4 rT4 = t5 rT5 = t6 rT6 = t7 rT7 = t8 rT8 = t9 rT9 = t10 rpT0 = t11 rpT1 = t12 rpT2 = t13 rpT3 = t14 rpT4 = t15 rpT5 = t16 rpT6 = t17
rIPSR = t18 rpCurTh = t19 rThCbStack = t20 rThCbBStore = t21 rRnat = loc0
alloc rT6 = ar.pfs, 3, 1, 0, 0 movl rpT0 = KiPcr+PcCurrentThread ;;
LDPTR (rpCurTh, rpT0) add rIPSR = TrStIPSR, t0 ;;
ld8 rIPSR = [rIPSR] movl rT1 = 1 << PSR_DB | 1 << PSR_TB | 1 << PSR_SS | 1 << PSR_LP
add rpT0 = ThCallbackStack, rpCurTh add rpT3 = ThCallbackBStore, rpCurTh ;;
LDPTR (rThCbStack, rpT0) // get callback stack address LDPTR (rThCbBStore, rpT3) // get callback bstore address and rIPSR = rIPSR, rT1 // capture db, tb, ss, lp bits ;;
cmp.eq pt1, pt2 = zero, rThCbStack add rpT1 = CuIntNats+STACK_SCRATCH_AREA, rThCbStack add rpT2 = CuApLC+STACK_SCRATCH_AREA, rThCbStack ;;
(pt2) ld8.nt1 rT0 = [rpT1], CuPreds - CuIntNats (pt1) movl v0 = STATUS_NO_CALLBACK_ACTIVE
(pt2) ld8.nt1 rT1 = [rpT2], CuBrRp - CuApLC nop.m 0 (pt1) br.ret.sptk.clr brp ;;
ld8.nt1 rT2 = [rpT1], CuRsPFS - CuPreds ld8.nt1 rT3 = [rpT2], CuBrS0 - CuBrRp mov v0 = a2 // set callback service status ;;
ld8.nt1 rT4 = [rpT1], CuBrS1 - CuRsPFS ld8.nt1 rT5 = [rpT2], CuBrS2 - CuBrS0 nop.i 0 ;;
mov ar.unat = rT0 mov ar.lc = rT1 nop.i 0
ld8.nt1 rT6 = [rpT1], CuBrS3 - CuBrS1 ld8.nt1 rT7 = [rpT2], CuBrS4 - CuBrS2 mov pr = rT2, -1 ;;
ld8.nt1 rT8 = [rpT1], CuIntS0 - CuBrS3 ld8.nt1 rT9 = [rpT2], CuIntS1 - CuBrS4 mov brp = rT3 ;;
ld8.fill.nt1 s0 = [rpT1], CuIntS2 - CuIntS0 ld8.fill.nt1 s1 = [rpT2], CuIntS3 - CuIntS1 mov ar.pfs = rT4 ;;
ld8.fill.nt1 s2 = [rpT1], CuApUNAT - CuIntS2 ld8.fill.nt1 s3 = [rpT2], CuRsRNAT - CuIntS3 mov bs0 = rT5 ;;
ld8.nt1 rT0 = [rpT1], CuFltS0 - CuApUNAT ld8.nt1 rRnat = [rpT2], CuFltS1 - CuRsRNAT mov bs1 = rT6 ;;
ldf.fill.nt1 fs0 = [rpT1], CuFltS2 - CuFltS0 ldf.fill.nt1 fs1 = [rpT2], CuFltS3 - CuFltS1 mov bs2 = rT7 ;;
ldf.fill.nt1 fs2 = [rpT1], CuFltS4 - CuFltS2 ldf.fill.nt1 fs3 = [rpT2], CuFltS5 - CuFltS3 mov bs3 = rT8 ;;
ldf.fill.nt1 fs4 = [rpT1], CuFltS6 - CuFltS4 ldf.fill.nt1 fs5 = [rpT2], CuFltS7 - CuFltS5 nop.i 0 ;;
ldf.fill.nt1 fs6 = [rpT1], CuFltS8 - CuFltS6 ldf.fill.nt1 fs7 = [rpT2], CuFltS9 - CuFltS7 nop.i 0 ;;
ldf.fill.nt1 fs8 = [rpT1], CuFltS10 - CuFltS8 ldf.fill.nt1 fs9 = [rpT2], CuFltS11 - CuFltS9 nop.i 0 ;;
ldf.fill.nt1 fs10 = [rpT1], CuFltS12 - CuFltS10 ldf.fill.nt1 fs11 = [rpT2], CuFltS13 - CuFltS11 nop.i 0 ;;
ldf.fill.nt1 fs12 = [rpT1], CuFltS14 - CuFltS12 ldf.fill.nt1 fs13 = [rpT2], CuFltS15 - CuFltS13 nop.i 0 ;;
ldf.fill.nt1 fs14 = [rpT1], CuFltS16 - CuFltS14 ldf.fill.nt1 fs15 = [rpT2], CuFltS17 - CuFltS15 nop.i 0 ;;
ldf.fill.nt1 fs16 = [rpT1], CuFltS18 - CuFltS16 ldf.fill.nt1 fs17 = [rpT2], CuFltS19 - CuFltS17 nop.i 0 ;;
ldf.fill.nt1 fs18 = [rpT1], CuA0 - CuFltS18 ldf.fill.nt1 fs19 = [rpT2], CuA1 - CuFltS19 nop.i 0 ;;
ld8.nt1 rpT5 = [rpT1], CuCbStk - CuA0 // load value of A0 mov ar.unat = rT0 mov bs4 = rT9 ;;
ld8.nt1 rT0 = [rpT1], CuTrFrame - CuCbStk // load callback stack ld8.nt1 rpT6 = [rpT2], CuCbBStore - CuA1 // load value of A1 add rpT3 = ThCallbackStack, rpCurTh ;;
ld8.nt1 rT1 = [rpT1], CuInStack - CuTrFrame // load trap frame addr ld8.nt1 rT2 = [rpT2], CuTrStIIP-CuCbBStore // load callback bstore add rpT4 = ThCallbackBStore, rpCurTh ;;
ld8.nt1 rT5 = [rpT1] // get previous initial stack ld8.nt1 rT4 = [rpT2], CuInBStore-CuTrStIIP // load trap frame IIP add rpT0 = ThTrapFrame, rpCurTh
STPTR (rpT5, a0) // store buffer address in A0 st4 [rpT6] = a1 // store buffer length in A1 add rpT6 = TrStIPSR, rT1
STPTR (rpT3, rT0) // restore callback stack addr STPTR (rpT4, rT2) // restore callback bstore addr add rpT3 = ThInitialStack, rpCurTh ;;
ld8.nt1 rT6 = [rpT2] // get previous initial bstore ld8 rT0 = [rpT6], TrStIIP-TrStIPSR add rpT5 = ThInitialBStore, rpCurTh ;;
st8.nta [rpT6] = rT4, TrStIPSR-TrStIIP // restore trap IIP rsm 1 << PSR_I // disable interrupts or rIPSR = rIPSR, rT0 ;;
st8 [rpT6] = rIPSR // propagate ss, db, tb, lp bits movl rpT4 = KiPcr+PcInitialStack ;;
alloc rT0 = ar.pfs, 0, 0, 0, 0 mov ar.rsc = r0 // put RSE in lazy mode mov rT7 = rRnat ;;
loadrs STPTR (rpT0, rT1) // restore trap frame address nop.i 0 ;;
mov ar.bspstore = rThCbBStore // rThCbBStore st8.nta [rpT4] = rT5, PcInitialBStore - PcInitialStack nop.i 0 ;;
//// restore initial stack and bstore.//
mov ar.rnat = rT7 STPTR (rpT3, rT5) nop.i 0 ;;
mov ar.rsc = RSC_KERNEL // restore RSC st8.nta [rpT4] = rT6 add sp = CuFrameLength, rThCbStack
STPTR (rpT5, rT6) ssm 1 << PSR_I // enable interrupts
invala br.ret.sptk.clr brp
LEAF_EXIT(NtCallbackReturn)
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