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cc65/libsrc/sim6502/crt0.s

33 lines
877 B
ArmAsm

;
; Oliver Schmidt, 2013-05-16
;
; Startup code for cc65 (sim6502 version)
;
.export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import zerobss, callmain
.import initlib, donelib
.import exit
.import __RAM_START__, __RAM_SIZE__ ; Linker generated
.import __STACKSIZE__ ; Linker generated
.include "zeropage.inc"
.segment "STARTUP"
cld
ldx #$FF
txs
lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
ldx #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
sta sp
stx sp+1
jsr zerobss
jsr initlib
jsr callmain
_exit: pha
jsr donelib
pla
jmp exit