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80 lines
1.6 KiB
ArmAsm
80 lines
1.6 KiB
ArmAsm
;
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; This must be the *second* file on the linker command line
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; (.cvt header must be the *first* one)
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; Maciej 'YTM/Alliance' Witkowiak
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; 26.10.99, 10.3.2000
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; no __hinit
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.export _exit
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.import initlib, donelib
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.import pushax
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.import _main
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.import zerobss
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; ------------------------------------------------------------------------
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; Define and export the ZP variables for the C64 runtime
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.exportzp sp, sreg, regsave, regbank
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.exportzp ptr1, ptr2, ptr3, ptr4
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.exportzp tmp1, tmp2, tmp3, tmp4
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sp = $72 ; stack pointer
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sreg = $74 ; secondary register/high 16 bit for longs
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regsave = $76 ; slot to save/restore (E)AX into
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ptr1 = $7A ;
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ptr2 = $7C
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ptr3 = $7E
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ptr4 = $70
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tmp1 = $fb
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tmp2 = $fc
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tmp3 = $fd
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tmp4 = $fe
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regbank = $a3 ; 6 bytes hopefully not used by Kernal
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; ------------------------------------------------------------------------
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; .org $0400-508 ; $0400 - length of .cvt header
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; .include "cvthead.s"
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.reloc
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; ------------------------------------------------------------------------
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; Actual code
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; Clear the BSS data
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jsr zerobss
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; Setup stack
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lda #<$7900
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sta sp
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lda #>$7900
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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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lda #0
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tax
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jsr pushax ; argc
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jsr pushax ; argv
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ldy #4 ; Argument size
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jsr _main ; call the users code
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jmp $c1c3 ; jump to GEOS MainLoop
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; Call module destructors. This is also the _exit entry which must be called
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; explicitly by the code.
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_exit: jsr donelib ; Run module destructors
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jmp $c22c ; EnterDeskTop
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