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Use a destructor instead of atexit

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git-svn-id: svn://svn.cc65.org/cc65/trunk@515 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2000-12-01 17:58:40 +00:00
parent b46dab6d44
commit e02b3e91c8
7 changed files with 77 additions and 91 deletions
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54
libsrc/c64/break.s
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@@ -6,24 +6,24 @@
;
.export _set_brk, _reset_brk
.destructor _reset_brk
.export _brk_a, _brk_x, _brk_y, _brk_sr, _brk_pc
.import _atexit
.include "c64.inc"
.bss
_brk_a: .res 1
_brk_x: .res 1
_brk_y: .res 1
_brk_sr: .res 1
_brk_pc: .res 2
_brk_a: .res 1
_brk_x: .res 1
_brk_y: .res 1
_brk_sr: .res 1
_brk_pc: .res 2
oldvec: .res 2 ; Old vector
.data
uservec: jmp $FFFF ; Patched at runtime
uservec: jmp $FFFF ; Patched at runtime
.code
@@ -31,26 +31,22 @@ uservec: jmp $FFFF ; Patched at runtime
; Set the break vector
.proc _set_brk
sta uservec+1
stx uservec+2 ; Set the user vector
sta uservec+1
stx uservec+2 ; Set the user vector
lda oldvec
ora oldvec+1 ; Did we save the vector already?
bne L1 ; Jump if we installed the handler already
lda oldvec
ora oldvec+1 ; Did we save the vector already?
bne L1 ; Jump if we installed the handler already
lda BRKVec
lda BRKVec
sta oldvec
lda BRKVec+1
sta oldvec+1 ; Save the old vector
lda BRKVec+1
sta oldvec+1 ; Save the old vector
lda #<_reset_brk
ldx #>_reset_brk
jsr _atexit ; Install an exit handler
L1: lda #<brk_handler ; Set the break vector to our routine
sta BRKVec
lda #>brk_handler
sta BRKVec+1
L1: lda #<brk_handler ; Set the break vector to our routine
sta BRKVec
lda #>brk_handler
sta BRKVec+1
rts
.endproc
@@ -59,11 +55,13 @@ L1: lda #<brk_handler ; Set the break vector to our routine
; Reset the break vector
.proc _reset_brk
lda oldvec
sta BRKVec
lda oldvec+1
sta BRKVec+1
rts
lda oldvec
bne @L1
ldx oldvec
beq @L9 ; Jump if vector not installed
@L1: sta BRKVec
stx BRKVec+1
@L9: rts
.endproc