mirror of
https://github.com/cc65/cc65.git
synced 2024-11-02 18:06:48 +00:00
82 lines
1.4 KiB
ArmAsm
82 lines
1.4 KiB
ArmAsm
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; Startup code for cc65 (supervision version)
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;
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; This must be the *first* file on the linker command line
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;
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.export _exit
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.import _main
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.import initlib, donelib, copydata
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.import zerobss
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.import __RAM_START__, __RAM_SIZE__ ; Linker generated
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.include "zeropage.inc"
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.include "supervision.inc"
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.export _sv_irq_timer_counter, _sv_irq_dma_counter
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.export _sv_nmi_counter
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.bss
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_sv_irq_dma_counter: .byte 0
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_sv_irq_timer_counter: .byte 0
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_sv_nmi_counter: .byte 0
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.code
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reset:
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jsr zerobss
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; initialize data
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jsr copydata
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lda #>(__RAM_START__ + __RAM_SIZE__)
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sta sp+1 ; Set argument stack ptr
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stz sp ; #<(__RAM_START__ + __RAM_SIZE__)
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jsr initlib
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jsr _main
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_exit: jsr donelib
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exit: jmp exit
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.proc irq
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pha
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lda sv_irq_source
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and #SV_IRQ_REQUEST_TIMER
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beq not_timer
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lda sv_timer_quit
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inc _sv_irq_timer_counter
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not_timer:
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lda sv_irq_source
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and #SV_IRQ_REQUEST_DMA
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beq not_dma
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lda sv_dma_quit
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inc _sv_irq_dma_counter
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not_dma:
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pla
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rti
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.endproc
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.proc nmi
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inc _sv_nmi_counter
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rti
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.endproc
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; removing this segment gives only a warning
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.segment "FFF0"
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.proc reset32kcode
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lda #(6<<5)
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sta sv_bank
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; now the 32kbyte image can reside in the top of 64kbyte, 128kbyte roms
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jmp reset
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.endproc
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.segment "VECTOR"
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.word nmi
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.word reset32kcode
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.word irq
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