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153 lines
2.8 KiB
Plaintext
153 lines
2.8 KiB
Plaintext
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; File: Aux.a
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;
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; Contains: Routines which support A/UX that could not be coded in C.
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; Written by: David Harrison
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;
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; Copyright: © 1990-1991 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <0> 12/4/90 DFH New Today.
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;
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;--------------------------------------------------------------------
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CASE OBJ
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LOAD 'ProcessMgrIncludes.D'
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SEG 'AUX_SEGMENT'
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__exit EQU 1
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__kill EQU 37
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__signal EQU 48
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__sigsetmask EQU 131
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aux_errno DCB.L 1,0
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__cerror PROC EXPORT
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lea aux_errno,a0
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move.l d0,(a0)
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move.l #-1,d0
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move.l d0,a0
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rts
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ENDPROC
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aux_kill PROC EXPORT
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move.l #__kill,d0
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trap #0
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bcs.b __cerror
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move.l #0,d0
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rts
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ENDPROC
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aux_sigsetmask PROC EXPORT
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move.l 4(sp),a0
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move.l #__sigsetmask,d0
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trap #15
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bcs.b __cerror
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rts
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ENDPROC
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aux_signal PROC EXPORT
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move.l #__signal,d0
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trap #0
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bcs.b __cerror
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rts
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ENDPROC
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aux_exit PROC EXPORT
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move.l #__exit,d0
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trap #0
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bcs.b __cerror
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rts
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ENDPROC
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;
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; void aux_ctxsw(Registers **optr, Registers *nptr, long nextTask)
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;
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aux_ctxsw PROC EXPORT
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SaveRegs REG d2-d7/a2-a6
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IMPORT AUX_SwitchGlue:CODE
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EXPORT aux_restore_ctx:CODE
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; save away the current context in the indicated region
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move sr,-(sp)
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lea aux_nextctx,a0
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move.l 14(sp),d0
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move.l 10(sp),(a0)
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move.l 6(sp),a0
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movem.l SaveRegs,-(sp)
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cmpa #0,a0 ; have place to save resulting sp?
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beq.s noSave ; jump if not
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move.l sp,(a0) ; save old sp into PEntry
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noSave
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; swap the a/ux context state if necessary
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; nextTask == 0 means don't switch
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tst.l d0
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beq.s @0
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move.w sr,-(sp) ; make sure interrupts
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and.w #$f8ff,sr ; are enabled
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move.l d0,-(sp)
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jsr AUX_SwitchGlue
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lea 4(sp),sp
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move.w (sp)+,sr ; put interupts back how
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; we found 'em
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@0
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; restore the new context from the indicated region
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move.l aux_nextctx,sp
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movem.l (sp)+,SaveRegs
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move (sp)+,sr
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rts
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aux_restore_ctx
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move.l 4(sp),sp
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movem.l (sp)+,SaveRegs
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move (sp)+,sr
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rts
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aux_nextctx DCB.L 1,0
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ENDPROC
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aux_fpxsw PROC EXPORT
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MC68881
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IMPORT aux_ctxsw:CODE
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; save away current floating point state
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lea 4(sp),a0
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fsave -(sp)
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tst.b (sp)
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beq.s @1
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fmovem fp0-fp7,-(sp)
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fmovem fpcr/fpsr/fpiar,-(sp)
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st -(sp)
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@1
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; do a regular context switch
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move.l 8(a0),-(sp)
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move.l 4(a0),-(sp)
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move.l (a0),-(sp)
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bsr.s aux_ctxsw
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lea 12(sp),sp
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; restore the saved floating point context
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tst.b (sp)
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beq.s @2
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lea 2(sp),sp
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fmovem (sp)+,fpcr/fpsr/fpiar
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fmovem (sp)+,fp0-fp7
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@2 frestore (sp)+
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rts
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ENDPROC
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END
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