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cc65/libsrc/geos/devel/crt0.s

48 lines
1009 B
ArmAsm

;
; Startup code for geos
;
; Maciej 'YTM/Elysium' Witkowiak
; 26.10.99, 10.3.2000, 15.8.2001, 23.12.2002
.export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import __RAM_START__, __RAM_SIZE__ ; Linker generated
.import __STACKSIZE__ ; Linker generated
.import initlib, donelib
.import callmain
.import zerobss
.importzp sp
.include "../inc/jumptab.inc"
; ------------------------------------------------------------------------
; Place the startup code in a special segment.
.segment "STARTUP"
; Clear the BSS data
jsr zerobss
; Setup stack
lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
sta sp
lda #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
sta sp+1 ; Set argument stack ptr
; Call module constructors
jsr initlib
; Push arguments and call main()
cli
jsr callmain
; Call module destructors.
_exit: jsr donelib ; Run module destructors
jmp EnterDeskTop ; return control to the system