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8216bf1d6a
main() is encountered. Define this symbol in the startup code. This will automatically force linking of the startup code which can then reside inside the standard library as any other object file. git-svn-id: svn://svn.cc65.org/cc65/trunk@3988 b7a2c559-68d2-44c3-8de9-860c34a00d81
81 lines
1.4 KiB
ArmAsm
81 lines
1.4 KiB
ArmAsm
;
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; Startup code for cc65 (supervision version)
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;
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.export _exit
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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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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