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// TITLE("Get Set Context Special Apc Wrapper")//++//// Copyright (c) 1993 Digital Equipment Corporation//// Module Name://// pswrap.s//// Abstract://// This module implements the PspGetSetContextSpecialApc function as an// assembly wrapper around the call to the real function.//// Author://// Thomas Van Baak (tvb) 26-Jul-1993//// Environment://// Kernel mode.//// Revision History:////--
#include "ksalpha.h"
SBTTL("Set Context Special Apc Wrapper") //++//// VOID// PspGetSetContextSpecialApc (// IN PKAPC Apc,// IN PKNORMAL_ROUTINE *NormalRoutine,// IN PVOID *NormalContext,// IN PVOID *SystemArgument1,// IN PVOID *SystemArgument2// )//// Routine Description://// This is a wrapper around the call to PspGetSetContextSpecialApcMain.// Its purpose is to save all preserved registers on the stack so the// virtual unwind loop in PspGetSetContextSpecialApc is guaranteed to find// that all preserved registers have been saved on the stack. The algorithm// used to query or modify thread context assumes all registers are stored// somewhere on the stack: either in the trap frame itself, or in register// save areas of any intervening stack frames.//// Arguments://// Apc - Supplies a pointer to the APC control object that caused entry// into this routine.//// NormalRoutine - Supplies a pointer to the normal routine function that// was specified when the APC was initialized. This parameter is not// used.//// NormalContext - Supplies a pointer to an arbitrary data structure that// was specified when the APC was initialized. This parameter is not// used.//// SystemArgument1, SystemArgument2 - Supplies a set of two pointer to two// arguments that contain untyped data. These parameters are not used.//// Return Value://// None.////--
.struct 0StRa: .space 8 // return addressStS0: .space 8 // 7 non-volatile integer registersStS1: .space 8 //StS2: .space 8 //StS3: .space 8 //StS4: .space 8 //StS5: .space 8 //StFp: .space 8 //StF2: .space 8 // 8 non-volatile floating registersStF3: .space 8 //StF4: .space 8 //StF5: .space 8 //StF6: .space 8 //StF7: .space 8 //StF8: .space 8 //StF9: .space 8 // .space 0 * 8 // padding for 16-byte stack alignmentStFrameSize: //
NESTED_ENTRY(PspGetSetContextSpecialApc, StFrameSize, zero)
lda sp, -StFrameSize(sp) // allocate stack frame stq ra, StRa(sp) // save return address
stq s0, StS0(sp) // save non-volatile integer registers stq s1, StS1(sp) // stq s2, StS2(sp) // stq s3, StS3(sp) // stq s4, StS4(sp) // stq s5, StS5(sp) //// stq fp, StFp(sp) //
stt f2, StF2(sp) // save non-volatile floating registers stt f3, StF3(sp) // stt f4, StF4(sp) // stt f5, StF5(sp) // stt f6, StF6(sp) // stt f7, StF7(sp) // stt f8, StF8(sp) // stt f9, StF9(sp) //
PROLOGUE_END
//// Pass the same five arguments to PspGetSetContextSpecialApcMain.//
bsr ra, PspGetSetContextSpecialApcMain ldq ra, StRa(sp) // restore return address
ldq s0, StS0(sp) // restore saved integer registers ldq s1, StS1(sp) // ldq s2, StS2(sp) // ldq s3, StS3(sp) // ldq s4, StS4(sp) // ldq s5, StS5(sp) //// ldq fp, StFp(sp) //
ldt f2, StF2(sp) // restore saved floating registers ldt f3, StF3(sp) // ldt f4, StF4(sp) // ldt f5, StF5(sp) // ldt f6, StF6(sp) // ldt f7, StF7(sp) // ldt f8, StF8(sp) // ldt f9, StF9(sp) //
lda sp, StFrameSize(sp) // deallocate stack frame ret zero, (ra) // return
.end PspGetSetContextSpecialApc
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