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53 lines
730 B
ArmAsm
53 lines
730 B
ArmAsm
;
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; Ullrich von Bassewitz, 06.06.1998
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;
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; void longjmp (jmp_buf buf, int retval);
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;
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.export _longjmp
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.import popax
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.importzp sp, ptr1, ptr2
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_longjmp:
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sta ptr2 ; Save retval
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stx ptr2+1
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ora ptr2+1 ; Check for 0
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bne @L1
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lda #1 ; 0 is illegal according to the standard...
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sta ptr2 ; ... and must be replaced by 1
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@L1: jsr popax ; get buf
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sta ptr1
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stx ptr1+1
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ldy #0
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; Get the old parameter stack
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lda (ptr1),y
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iny
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sta sp
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lda (ptr1),y
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iny
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sta sp+1
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; Get the old stack pointer
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lda (ptr1),y
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iny
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tax
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txs
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; Get the return address and push it on the stack
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lda (ptr1),y
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iny
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pha
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lda (ptr1),y
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pha
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; Load the return value and return to the caller
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lda ptr2
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ldx ptr2+1
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rts
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