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cc65/libsrc/runtime/lmod.s
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ArmAsm

;
; Ullrich von Bassewitz, 07.08.1998
;
; CC65 runtime: modulo operation for long signed ints
;
; When negating values, we will ignore the possibility here, that one of the
; values if $8000, in which case the negate will fail.
.export tosmodeax
.import poplsargs, udiv32, adjlsres
.importzp sreg, ptr1, ptr2, tmp3, tmp4
tosmodeax:
jsr poplsargs ; Get arguments from stack, adjust sign
jsr udiv32 ; Do the division
lda ptr1 ; Remainder is in (ptr2:tmp3:tmp4)
lda ptr2
ldx ptr2+1
ldy tmp3
sty sreg
ldy tmp4
sty sreg+1
jmp adjlsres ; Adjust the sign of the result if needed