mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
93 lines
1.4 KiB
ArmAsm
93 lines
1.4 KiB
ArmAsm
;
|
|
; Startup code for cc65 (Apple2 version)
|
|
;
|
|
; This must be the *first* file on the linker command line
|
|
;
|
|
|
|
.export _exit
|
|
.import initlib, donelib
|
|
.import zerobss, push0
|
|
.import _main
|
|
|
|
.include "zeropage.inc"
|
|
.include "apple2.inc"
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Actual code
|
|
|
|
.code
|
|
|
|
ldx #zpspace-1
|
|
L1: lda sp,x
|
|
sta zpsave,x ; Save the zero page locations we need
|
|
dex
|
|
bpl L1
|
|
|
|
; Clear the BSS data
|
|
|
|
jsr zerobss
|
|
|
|
; Save system stuff and setup the stack
|
|
|
|
tsx
|
|
stx spsave ; Save the system stack ptr
|
|
|
|
lda #<TOPMEM
|
|
sta sp
|
|
lda #>TOPMEM
|
|
sta sp+1 ; Set argument stack ptr
|
|
|
|
; Call module constructors
|
|
|
|
jsr initlib
|
|
|
|
; Initialize conio stuff
|
|
|
|
lda #$ff
|
|
sta TEXTTYP
|
|
|
|
; Set up to use Apple ROM $C000-$CFFF
|
|
|
|
;; sta USEROM
|
|
|
|
; Pass an empty command line
|
|
|
|
jsr push0 ; argc
|
|
jsr push0 ; argv
|
|
|
|
ldy #4 ; Argument size
|
|
jsr _main ; call the users code
|
|
|
|
; Call module destructors. This is also the _exit entry.
|
|
|
|
_exit: jsr donelib
|
|
|
|
; Restore system stuff
|
|
|
|
lda #$ff ; Reset text mode
|
|
sta TEXTTYP
|
|
|
|
ldx spsave
|
|
txs ; Restore stack pointer
|
|
|
|
; Copy back the zero page stuff
|
|
|
|
ldx #zpspace-1
|
|
L2: lda zpsave,x
|
|
sta sp,x
|
|
dex
|
|
bpl L2
|
|
|
|
; Reset changed vectors, back to basic
|
|
|
|
jmp RESTOR
|
|
|
|
|
|
.data
|
|
|
|
zpsave: .res zpspace
|
|
|
|
.bss
|
|
|
|
spsave: .res 1
|