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72 lines
1.4 KiB
ArmAsm
72 lines
1.4 KiB
ArmAsm
;
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; Startup code for cc65 (Oric version)
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;
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; By Debrune Jérôme <jede@oric.org> and Ullrich von Bassewitz <uz@cc65.org>
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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 initlib, donelib
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.import push0, _main, zerobss
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.import __RAM_START__, __RAM_SIZE__ ; Linker generated
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.importzp sp
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; ------------------------------------------------------------------------
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; Create an empty LOWCODE segment to avoid linker warnings
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.segment "LOWCODE"
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; ------------------------------------------------------------------------
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; Place the startup code in a special segment.
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.segment "STARTUP"
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; Clear the BSS data
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jsr zerobss
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; Save system stuff and setup the stack
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tsx
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stx spsave ; save system stk ptr
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lda #<(__RAM_START__ + __RAM_SIZE__)
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sta sp
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lda #>(__RAM_START__ + __RAM_SIZE__)
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sta sp+1 ; Set argument stack ptr
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; Call module constructors
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jsr initlib
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; Pass an empty command line
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jsr push0 ; argc
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jsr push0 ; argv
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ldy #4 ; Argument size
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jsr _main ; call the users code
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; Call module destructors. This is also the _exit entry.
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_exit: jsr donelib ; Run module destructors
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; Restore system stuff
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ldx spsave
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txs
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; Back to BASIC
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rts
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; ------------------------------------------------------------------------
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; Data
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.bss
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spsave: .res 1
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