mirror of
https://github.com/cc65/cc65.git
synced 2024-12-25 02:29:52 +00:00
82 lines
1.4 KiB
ArmAsm
82 lines
1.4 KiB
ArmAsm
;
|
|
; Startup code for cc65 (supervision version)
|
|
;
|
|
; This must be the *first* file on the linker command line
|
|
;
|
|
|
|
.export _exit
|
|
|
|
.import _main
|
|
.import initlib, donelib, copydata
|
|
.import zerobss
|
|
.import __RAM_START__, __RAM_SIZE__ ; Linker generated
|
|
|
|
.include "zeropage.inc"
|
|
.include "supervision.inc"
|
|
|
|
.export _sv_irq_timer_counter, _sv_irq_dma_counter
|
|
.export _sv_nmi_counter
|
|
|
|
.bss
|
|
|
|
_sv_irq_dma_counter: .byte 0
|
|
_sv_irq_timer_counter: .byte 0
|
|
_sv_nmi_counter: .byte 0
|
|
|
|
.code
|
|
|
|
reset:
|
|
jsr zerobss
|
|
|
|
; initialize data
|
|
jsr copydata
|
|
|
|
lda #>(__RAM_START__ + __RAM_SIZE__)
|
|
sta sp+1 ; Set argument stack ptr
|
|
stz sp ; #<(__RAM_START__ + __RAM_SIZE__)
|
|
jsr initlib
|
|
jsr _main
|
|
_exit: jsr donelib
|
|
exit: jmp exit
|
|
|
|
|
|
.proc irq
|
|
pha
|
|
lda sv_irq_source
|
|
and #SV_IRQ_REQUEST_TIMER
|
|
beq not_timer
|
|
lda sv_timer_quit
|
|
inc _sv_irq_timer_counter
|
|
not_timer:
|
|
lda sv_irq_source
|
|
and #SV_IRQ_REQUEST_DMA
|
|
beq not_dma
|
|
lda sv_dma_quit
|
|
inc _sv_irq_dma_counter
|
|
not_dma:
|
|
pla
|
|
rti
|
|
.endproc
|
|
|
|
.proc nmi
|
|
inc _sv_nmi_counter
|
|
rti
|
|
.endproc
|
|
|
|
; removing this segment gives only a warning
|
|
.segment "FFF0"
|
|
.proc reset32kcode
|
|
lda #(6<<5)
|
|
sta sv_bank
|
|
; now the 32kbyte image can reside in the top of 64kbyte, 128kbyte roms
|
|
jmp reset
|
|
.endproc
|
|
|
|
.segment "VECTOR"
|
|
|
|
.word nmi
|
|
.word reset32kcode
|
|
.word irq
|
|
|
|
|