mirror of
https://github.com/cc65/cc65.git
synced 2024-10-30 12:28:25 +00:00
8216bf1d6a
main() is encountered. Define this symbol in the startup code. This will automatically force linking of the startup code which can then reside inside the standard library as any other object file. git-svn-id: svn://svn.cc65.org/cc65/trunk@3988 b7a2c559-68d2-44c3-8de9-860c34a00d81
111 lines
2.4 KiB
ArmAsm
111 lines
2.4 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 __RAM_START__, __RAM_SIZE__, __BSS_LOAD__
|
|
|
|
.include "zeropage.inc"
|
|
.include "atmos.inc"
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Oric tape header
|
|
|
|
.segment "TAPEHDR"
|
|
|
|
.byte $16, $16, $16 ; Sync bytes
|
|
.byte $24 ; End of header marker
|
|
|
|
.byte $00 ; $2B0
|
|
.byte $00 ; $2AF
|
|
.byte $80 ; $2AE Machine code flag
|
|
.byte $C7 ; $2AD Autoload flag
|
|
.dbyt __BSS_LOAD__ ; $2AB
|
|
.dbyt __RAM_START__ ; $2A9
|
|
.byte $00 ; $2A8
|
|
.byte $00 ; Zero terminated name
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Place the startup code in a special segment.
|
|
|
|
.segment "STARTUP"
|
|
|
|
; Save the zero page area we're about to use
|
|
|
|
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
|
|
|
|
; Unprotect columns 0 and 1
|
|
|
|
lda STATUS
|
|
sta stsave
|
|
and #%11011111
|
|
sta STATUS
|
|
|
|
; Save system stuff and setup the stack
|
|
|
|
tsx
|
|
stx spsave ; save system stk ptr
|
|
|
|
lda #<(__RAM_START__ + __RAM_SIZE__)
|
|
sta sp
|
|
lda #>(__RAM_START__ + __RAM_SIZE__)
|
|
sta sp+1 ; Set argument stack ptr
|
|
|
|
; Call module constructors
|
|
|
|
jsr initlib
|
|
|
|
; Push arguments and call main()
|
|
|
|
jsr callmain
|
|
|
|
; Call module destructors. This is also the _exit entry.
|
|
|
|
_exit: jsr donelib ; Run module destructors
|
|
|
|
; Restore system stuff
|
|
|
|
ldx spsave
|
|
txs
|
|
lda stsave
|
|
sta STATUS
|
|
|
|
; Copy back the zero page stuff
|
|
|
|
ldx #zpspace-1
|
|
L2: lda zpsave,x
|
|
sta sp,x
|
|
dex
|
|
bpl L2
|
|
|
|
; Back to BASIC
|
|
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Data
|
|
|
|
.segment "ZPSAVE"
|
|
|
|
zpsave: .res zpspace
|
|
|
|
.bss
|
|
spsave: .res 1
|
|
stsave: .res 1
|
|
|
|
|