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Added an exit handler - code from Oliver Schmidt

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3341 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2004-12-21 15:56:48 +00:00
parent e55a4bcfd4
commit 10431b1067
2 changed files with 51 additions and 8 deletions
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2
libsrc/apple2/apple2.inc
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@ -14,6 +14,8 @@ HIMEM := $73 ; Highest available memory address+1
;-----------------------------------------------------------------------------
; Vectors
SOFTEV := $03F2 ; Vector for warm start
PWREDUP := $03F4 ; This must be = EOR #$A5 of SOFTEV+1
DOSWARM := $03D0 ; DOS warmstart vector
BRKVec := $03F0 ; Break vector
MLI := $BF00 ; ProDOS Machine Language Interface

57
libsrc/apple2/crt0.s
View File

@ -4,7 +4,7 @@
; This must be the *first* file on the linker command line
;
.export _exit
.export _exit, __Exit
.import initlib, donelib
.import zerobss
.import __STARTUP_LOAD__, __BSS_LOAD__ ; Linker generated
@ -36,16 +36,32 @@
; Save the zero page locations we need
ldx #zpspace-1
L1: lda sp,x
: lda sp,x
sta zpsave,x
dex
bpl L1
bpl :-
; Save the original RESET vector
ldx #$02
: lda SOFTEV,x
sta rvsave,x
dex
bpl :-
; ProDOS TechRefMan, chapter 5.3.5:
; "Your system program should place in the RESET vector the address of a
; routine that ... closes the files."
ldx #<_exit
lda #>_exit
jsr reset ; Setup RESET vector
; Clear the BSS data
jsr zerobss
; Save system stuff and setup the stack
; Setup the stack
lda HIMEM
sta sp
@ -60,17 +76,31 @@ L1: lda sp,x
jsr callmain
; Call module destructors. This is also the _exit entry.
; Avoid re-entrance of donelib. This is also the _exit entry
_exit: jsr donelib
_exit: ldx #<__Exit
lda #>__Exit
jsr reset ; Setup RESET vector
; Call module destructors
jsr donelib
; Restore the original RESET vector. This is also the __Exit entry
__Exit: ldx #$02
: lda rvsave,x
sta SOFTEV,x
dex
bpl :-
; Copy back the zero page stuff
ldx #zpspace-1
L2: lda zpsave,x
: lda zpsave,x
sta sp,x
dex
bpl L2
bpl :-
; ProDOS TechRefMan, chapter 5.2.1:
; "System programs should set the stack pointer to $FF at the warm-start
@ -83,9 +113,20 @@ L2: lda zpsave,x
jmp DOSWARM
; ------------------------------------------------------------------------
; Setup RESET vector
reset: stx SOFTEV
sta SOFTEV+1
eor #$A5
sta PWREDUP
rts
; ------------------------------------------------------------------------
; Data
.data
zpsave: .res zpspace
rvsave: .res 3