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53 lines
536 B
ArmAsm
53 lines
536 B
ArmAsm
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; Ullrich von Bassewitz, 06.06.1998
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;
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; int setjmp (jmp_buf buf);
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;
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.export __setjmp
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.importzp sp, ptr1
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__setjmp:
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sta ptr1 ; Save buf
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stx ptr1+1
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ldy #0
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; The parameter stack is now empty, put it into buf
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lda sp
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sta (ptr1),y
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iny
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lda sp+1
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sta (ptr1),y
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iny
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; Put the return stack pointer next
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tsx
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inx
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inx ; drop return address
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txa
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sta (ptr1),y
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iny
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; Last thing is the return address.
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pla
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tax
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pla
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sta (ptr1),y ; high byte first
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iny
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pha
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txa
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sta (ptr1),y
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pha
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; Return zero
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lda #0
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tax
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rts
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