mirror of
https://github.com/cc65/cc65.git
synced 2024-12-25 02:29:52 +00:00
91 lines
1.9 KiB
ArmAsm
91 lines
1.9 KiB
ArmAsm
;
|
|
; Startup code for cc65 (Oric version)
|
|
;
|
|
; By Debrune Jérôme <jede@oric.org> and Ullrich von Bassewitz <uz@cc65.org>
|
|
;
|
|
|
|
.export _exit
|
|
.export __STARTUP__ : absolute = 1 ; Mark as startup
|
|
|
|
.import initlib, donelib
|
|
.import callmain, zerobss
|
|
.import __MAIN_START__, __MAIN_SIZE__
|
|
|
|
.include "zeropage.inc"
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Place the startup code in a special segment.
|
|
|
|
.segment "STARTUP"
|
|
|
|
tsx
|
|
stx spsave ; Save system stk ptr
|
|
|
|
; Save space by putting some of the start-up code in a segment
|
|
; that will be re-used.
|
|
|
|
jsr init
|
|
|
|
; Clear the BSS variables (after the constructors have been run).
|
|
|
|
jsr zerobss
|
|
|
|
; Push the command-line arguments; and, call main().
|
|
|
|
jsr callmain
|
|
|
|
; Call the module destructors. This is also the exit() entry.
|
|
|
|
_exit: jsr donelib
|
|
|
|
; Restore the system stuff.
|
|
|
|
ldx spsave
|
|
txs
|
|
|
|
; Copy back the zero-page stuff.
|
|
|
|
ldx #zpspace - 1
|
|
L2: lda zpsave,x
|
|
sta sp,x
|
|
dex
|
|
bpl L2
|
|
|
|
; Back to BASIC.
|
|
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Put this code in a place that will be re-used by BSS, the heap,
|
|
; and the C stack.
|
|
|
|
.segment "ONCE"
|
|
|
|
; Save the zero-page area that we're about to use.
|
|
|
|
init: ldx #zpspace - 1
|
|
L1: lda sp,x
|
|
sta zpsave,x
|
|
dex
|
|
bpl L1
|
|
|
|
|
|
; Set up the C stack.
|
|
|
|
lda #<(__MAIN_START__ + __MAIN_SIZE__)
|
|
ldx #>(__MAIN_START__ + __MAIN_SIZE__)
|
|
sta sp
|
|
stx sp+1 ; Set argument stack ptr
|
|
|
|
; Call the module constructors.
|
|
|
|
jmp initlib
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.segment "INIT"
|
|
|
|
spsave: .res 1
|
|
stsave: .res 1
|
|
zpsave: .res zpspace
|