mirror of
https://github.com/cc65/cc65.git
synced 2024-07-02 15:29:33 +00:00
f257b2ee81
segment to reduce the executable size. git-svn-id: svn://svn.cc65.org/cc65/trunk@3849 b7a2c559-68d2-44c3-8de9-860c34a00d81
112 lines
2.4 KiB
ArmAsm
112 lines
2.4 KiB
ArmAsm
;
|
|
; Startup code for cc65 (Oric version)
|
|
;
|
|
; By Debrune Jérôme <jede@oric.org> and Ullrich von Bassewitz <uz@cc65.org>
|
|
;
|
|
; This must be the *first* file on the linker command line
|
|
;
|
|
|
|
.export _exit
|
|
.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
|
|
|
|
|