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