mirror of https://github.com/GnoConsortium/gno.git
131 lines
1.5 KiB
NASM
131 lines
1.5 KiB
NASM
;
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; Stack checking routines by Phillip Vandry <vandry@cam.org>. Added
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; to GNO by Devin Reade <gdr@gno.org>. See the man page for details.
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;
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; $Id: stack.asm,v 1.4 1999/07/03 14:37:36 gdr-ftp Exp $
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;
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keep stack
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mcopy :obj:gno:lib:libc:gno:stack.mac
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case on
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* This test function goes into "stack.ROOT", which is not used
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main start
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jsl _beginStackCheck
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ldx #16
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jsr recurse
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jsl _endStackCheck
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rtl
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recurse dex
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beq outs
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jsr recurse
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outs rts
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end
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_beginStackCheck start libc_gno__
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using stack_str
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phb
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pha
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pha
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pea 0
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phd
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~FindHandle *
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tsc
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phd
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tcd
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pha
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pha
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pei 3
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pei 1
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~GetHandleSize *
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pla
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sta >stack_size
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pla
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lda [1]
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* leave 256 bytes at the beginning for SANE
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clc
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adc #256
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tay ; start of handle
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sta >stack_loc
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ldx #0
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tsc
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dec a
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dec a
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sta 3
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pea 0
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plb
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plb
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lppp anop
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txa
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and #%111
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tax
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lda >stack_str,x
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sta |0,y
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iny
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inx
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cpy 3
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bcc lppp
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pld
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pla
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pla
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plb
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rtl
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end
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_endStackCheck start libc_gno__
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using stack_str
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phb
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pea 0
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plb
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plb
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lda >stack_loc
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tay
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ldx #0
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lda |0,y
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cmp >stack_str,x
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beq lp2
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lda #$ffff ; gone over
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bra terminate
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lp2 anop
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txa
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and #%111
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tax
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lda |0,y
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cmp >stack_str,x
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bne gotend
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inx
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iny
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bra lp2
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gotend anop ; Y = Stack not used
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tya
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sec
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sbc >stack_loc
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pha
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lda >stack_size
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sec
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sbc 1,s
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ply
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terminate plb
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rtl
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end
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; This one was added by Devin Reade. It is used by _assertStack(3).
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_getStackBottom start libc_gno__
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lda >~MINSTACK
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rtl
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end
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setcom 50
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stack_str privdata libc_gno__
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dc c'StackChkS'
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stack_size ds 2
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stack_loc ds 2
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end
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