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51 lines
877 B
ArmAsm
51 lines
877 B
ArmAsm
;
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; 1998-06-06, Ullrich von Bassewitz
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; 2015-09-11, Greg King
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;
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; int __fastcall__ __setjmp (jmp_buf buf);
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;
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.export ___setjmp
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.import return0
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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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jmp return0
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