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49 lines
487 B
ArmAsm
49 lines
487 B
ArmAsm
;
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; Ullrich von Bassewitz, 18.08.1998
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;
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; Stack checker
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;
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.export _stkcheck, __stksafety
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.import pushax, exit
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.import __hend
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.importzp sp
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.data
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__stksafety:
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.word 64 ;
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.code
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_stkcheck:
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clc
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lda __hend
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adc __stksafety
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tax ; Remember low byte
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lda __hend+1
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adc __stksafety+1
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cmp sp+1
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bcc Ok
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bne L1
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cpx sp
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bcc Ok
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; Stack overflow
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L1: inc sp+1 ; Create 256 bytes of space
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ldx #0
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lda #4
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jsr pushax
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jmp exit
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; All is well
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Ok: rts
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