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set X to bottom part of eval stack in irq handler. fixes #94

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Irmen de Jong 2023-03-10 23:29:34 +01:00
parent 96996bf18e
commit 043df18daa
4 changed files with 18 additions and 37 deletions
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18
compiler/res/prog8lib/c128/syslib.p8
View File

@ -340,8 +340,7 @@ _modified jsr $ffff ; modified
_use_kernal .byte 0
_irq_handler_init
; save all zp scratch registers and the X register as these might be clobbered by the irq routine
stx IRQ_X_REG
; save all zp scratch registers as these might be clobbered by the irq routine
lda P8ZP_SCRATCH_B1
sta IRQ_SCRATCH_ZPB1
lda P8ZP_SCRATCH_REG
@ -354,18 +353,15 @@ _irq_handler_init
sta IRQ_SCRATCH_ZPWORD2
lda P8ZP_SCRATCH_W2+1
sta IRQ_SCRATCH_ZPWORD2+1
; stack protector; make sure we don't clobber the top of the evaluation stack
dex
dex
dex
dex
dex
dex
; Set X to the bottom 32 bytes of the evaluation stack, to HOPEFULLY not clobber it.
; This leaves 128-32=96 stack entries for the main program, and 32 stack entries for the IRQ handler.
; We assume IRQ handlers don't contain complex expressions taking up more than that.
ldx #32
cld
rts
_irq_handler_end
; restore all zp scratch registers and the X register
; restore all zp scratch registers
lda IRQ_SCRATCH_ZPB1
sta P8ZP_SCRATCH_B1
lda IRQ_SCRATCH_ZPREG
@ -378,10 +374,8 @@ _irq_handler_end
sta P8ZP_SCRATCH_W2
lda IRQ_SCRATCH_ZPWORD2+1
sta P8ZP_SCRATCH_W2+1
ldx IRQ_X_REG
rts
IRQ_X_REG .byte 0
IRQ_SCRATCH_ZPB1 .byte 0
IRQ_SCRATCH_ZPREG .byte 0
IRQ_SCRATCH_ZPWORD1 .word 0

18
compiler/res/prog8lib/c64/syslib.p8
View File

@ -384,8 +384,7 @@ _modified jsr $ffff ; modified
_use_kernal .byte 0
_irq_handler_init
; save all zp scratch registers and the X register as these might be clobbered by the irq routine
stx IRQ_X_REG
; save all zp scratch registers as these might be clobbered by the irq routine
lda P8ZP_SCRATCH_B1
sta IRQ_SCRATCH_ZPB1
lda P8ZP_SCRATCH_REG
@ -398,18 +397,15 @@ _irq_handler_init
sta IRQ_SCRATCH_ZPWORD2
lda P8ZP_SCRATCH_W2+1
sta IRQ_SCRATCH_ZPWORD2+1
; stack protector; make sure we don't clobber the top of the evaluation stack
dex
dex
dex
dex
dex
dex
; Set X to the bottom 32 bytes of the evaluation stack, to HOPEFULLY not clobber it.
; This leaves 128-32=96 stack entries for the main program, and 32 stack entries for the IRQ handler.
; We assume IRQ handlers don't contain complex expressions taking up more than that.
ldx #32
cld
rts
_irq_handler_end
; restore all zp scratch registers and the X register
; restore all zp scratch registers
lda IRQ_SCRATCH_ZPB1
sta P8ZP_SCRATCH_B1
lda IRQ_SCRATCH_ZPREG
@ -422,10 +418,8 @@ _irq_handler_end
sta P8ZP_SCRATCH_W2
lda IRQ_SCRATCH_ZPWORD2+1
sta P8ZP_SCRATCH_W2+1
ldx IRQ_X_REG
rts
IRQ_X_REG .byte 0
IRQ_SCRATCH_ZPB1 .byte 0
IRQ_SCRATCH_ZPREG .byte 0
IRQ_SCRATCH_ZPWORD1 .word 0

18
compiler/res/prog8lib/cx16/syslib.p8
View File

@ -729,8 +729,7 @@ _modified jsr $ffff ; modified
_use_kernal .byte 0
_irq_handler_init
; save all zp scratch registers and the X register as these might be clobbered by the irq routine
stx IRQ_X_REG
; save all zp scratch registers as these might be clobbered by the irq routine
lda P8ZP_SCRATCH_B1
sta IRQ_SCRATCH_ZPB1
lda P8ZP_SCRATCH_REG
@ -743,18 +742,15 @@ _irq_handler_init
sta IRQ_SCRATCH_ZPWORD2
lda P8ZP_SCRATCH_W2+1
sta IRQ_SCRATCH_ZPWORD2+1
; stack protector; make sure we don't clobber the top of the evaluation stack
dex
dex
dex
dex
dex
dex
; Set X to the bottom 32 bytes of the evaluation stack, to HOPEFULLY not clobber it.
; This leaves 128-32=96 stack entries for the main program, and 32 stack entries for the IRQ handler.
; We assume IRQ handlers don't contain complex expressions taking up more than that.
ldx #32
cld
rts
_irq_handler_end
; restore all zp scratch registers and the X register
; restore all zp scratch registers
lda IRQ_SCRATCH_ZPB1
sta P8ZP_SCRATCH_B1
lda IRQ_SCRATCH_ZPREG
@ -767,10 +763,8 @@ _irq_handler_end
sta P8ZP_SCRATCH_W2
lda IRQ_SCRATCH_ZPWORD2+1
sta P8ZP_SCRATCH_W2+1
ldx IRQ_X_REG
rts
IRQ_X_REG .byte 0
IRQ_SCRATCH_ZPB1 .byte 0
IRQ_SCRATCH_ZPREG .byte 0
IRQ_SCRATCH_ZPWORD1 .word 0

1
docs/source/todo.rst
View File

@ -3,7 +3,6 @@ TODO
For next minor release
^^^^^^^^^^^^^^^^^^^^^^
- fix Github issue with X register https://github.com/irmen/prog8/issues/94
- fix Github issue with array problems https://github.com/irmen/prog8/issues/99
- fix IR/VM: animals.p8 example is borked, it jumps straight to a suggestion and then somehow doesn't print the animal name correctly in the first question, and exits after 1 animal instead of looping
this has happened after v8.7: caused by c21913a6 ir: keep order of children in block 22-11-2022