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* asm_support.asm - AmigaOS utility functions in assembly language |
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* Basilisk II (C) 1997-2001 Christian Bauer |
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* Basilisk II (C) 1997-2002 Christian Bauer |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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XDEF _Execute68kTrap |
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XDEF _TrapHandlerAsm |
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XDEF _ExceptionHandlerAsm |
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XDEF _Scod060Patch1 |
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XDEF _Scod060Patch2 |
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XDEF _ThInitFPUPatch |
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XDEF _AsmTriggerNMI |
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XREF _OldTrapHandler |
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rts |
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* |
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* Process Manager 68060 FPU patches |
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* |
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_Scod060Patch1 fsave -(sp) ;Save FPU state |
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tst.b 2(sp) ;Null? |
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beq.s 1$ |
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fmovem.x fp0-fp7,-(sp) ;No, save FPU registers |
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fmove.l fpiar,-(sp) |
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fmove.l fpsr,-(sp) |
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fmove.l fpcr,-(sp) |
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pea -1 ;Push "FPU state saved" flag |
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1$ move.l d1,-(sp) |
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move.l d0,-(sp) |
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bsr.s 3$ ;Switch integer registers and stack |
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addq.l #8,sp |
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tst.b 2(sp) ;New FPU state null or "FPU state saved" flag set? |
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beq.s 2$ |
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addq.l #4,sp ;Flag set, skip it |
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fmove.l (sp)+,fpcr ;Restore FPU registers and state |
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fmove.l (sp)+,fpsr |
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fmove.l (sp)+,fpiar |
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fmovem.x (sp)+,fp0-fp7 |
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2$ frestore (sp)+ |
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movem.l (sp)+,d0-d1 |
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rts |
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3$ move.l 4(sp),a0 ;Switch integer registers and stack |
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move sr,-(sp) |
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movem.l d2-d7/a2-a6,-(sp) |
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cmp.w #0,a0 |
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beq.s 4$ |
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move.l sp,(a0) |
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4$ move.l $36(sp),a0 |
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movem.l (a0)+,d2-d7/a2-a6 |
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move (a0)+,sr |
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move.l a0,sp |
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rts |
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_Scod060Patch2 move.l d0,-(sp) ;Create 68060 null frame on stack |
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move.l d0,-(sp) |
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move.l d0,-(sp) |
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frestore (sp)+ ;and load it |
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rts |
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* |
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* Thread Manager 68060 FPU patches |
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* |
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_ThInitFPUPatch tst.b $40(a4) |
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bne.s 1$ |
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moveq #0,d0 ;Create 68060 null frame on stack |
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move.l d0,-(a3) |
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move.l d0,-(a3) |
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move.l d0,-(a3) |
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1$ rts |
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* |
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* Trap handler of main task |
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* |
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addq.l #8,sp ;Remove exception frame from supervisor stack |
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andi #$d8ff,sr ;Switch to user mode, enable interrupts |
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and.w #$d8ff,_EmulatedSR ;enable interrupts in EmulatedSR |
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move.l $28.w,-(sp) ;Jump to MacOS exception handler |
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rts |
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fsavepush move.l (sp),d0 ;Restore d0 |
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move.l a0,(sp) ;Save a0 |
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move.l usp,a0 ;Get user stack pointer |
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fsave -(a0) ;Push FP state |
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move.l #$41000000,-(a0) ;Push idle frame |
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move.l a0,usp ;Update USP |
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move.l (sp)+,a0 ;Restore a0 |
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addq.l #2,2(sp) ;Skip instruction |
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rte |
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; fsave xxx(a5) |
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fsavea5 move.l (sp),d0 ;Restore d0 |
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move.l a0,(sp) ;Save a0 |
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move.l a5,a0 ;Get base register |
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add.w ([6,sp],2),a0 ;Add offset to base register |
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move.l #$41000000,(a0) ;Push idle frame |
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move.l (sp)+,a0 ;Restore a0 |
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addq.l #4,2(sp) ;Skip instruction |
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rte |
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; frestore (sp)+ |
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frestorepop move.l (sp),d0 ;Restore d0 |
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move.l a0,(sp) ;Save a0 |
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move.l usp,a0 ;Get user stack pointer |
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frestore (a0)+ ;Restore FP state |
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addq.l #4,a0 ;Nothing to do... |
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move.l a0,usp ;Update USP |
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move.l (sp)+,a0 ;Restore a0 |
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addq.l #2,2(sp) ;Skip instruction |
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rte |
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; frestore xxx(a5) +jl+ |
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; frestore xxx(a5) |
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frestorea5 move.l (sp),d0 ;Restore d0 |
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move.l a0,(sp) ;Save a0 |
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move.l a5,a0 ;Get base register |
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add.w ([6,sp],2),a0 ;Add offset to base register |
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frestore (a0) ;Restore FP state from (a0) |
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move.l (sp)+,a0 ;Restore a0 |
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addq.l #4,2(sp) ;Skip instruction |
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rte |
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; fsave xxx(a5) +jl+ |
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fsavea5 move.l (sp),d0 ;Restore d0 |
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move.l a0,(sp) ;Save a0 |
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move.l a5,a0 ;Get base register |
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add.w ([6,sp],2),a0 ;Add offset to base register |
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fsave (a0) ;Push FP state to (a0) |
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move.l (sp)+,a0 ;Restore a0 |
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addq.l #4,2(sp) ;Skip instruction |
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rte |
