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cc65/libsrc/runtime/ldeax.s
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ArmAsm

;
; Ullrich von Bassewitz, 29.12.1999
;
; CC65 runtime: Load eax from immidiate value following the call
;
.export ldeax
.importzp sreg, ptr4
ldeax: pla ; Low byte of return address
sta ptr4
pla ; high byte of return address
sta ptr4+1
ldy #4 ; high byte of value
lda (ptr4),y
sta sreg+1
dey
lda (ptr4),y
sta sreg
dey
lda (ptr4),y
tax
dey
lda (ptr4),y
tay ; Save low byte
clc
lda #4
adc ptr4
sta ptr4
lda ptr4+1
adc #$00
pha ; High byte of new return address
lda ptr4
pha ; Low byte of new return address
tya ; Low byte of fetched value
rts