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cc65/libsrc/runtime/popsreg.s

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;
; Ullrich von Bassewitz, 21.08.1998
;
; CC65 runtime: Pop TOS into sreg
;
.export popsreg
.import incsp2
.importzp sp, sreg
popsreg:
pha ; save A
ldy #0
lda (sp),y ; get lo byte
sta sreg ; store it
iny
lda (sp),y ; get hi byte
sta sreg+1 ; store it
pla ; get A back
jmp incsp2 ; bump stack and return