1;; SPDX-License-Identifier: GPL-2.0-or-later
 2;;  Copyright 2010  Free Software Foundation, Inc.
 3;;  Contributed by Bernd Schmidt <bernds@codesourcery.com>.
 4;;
 5
 6#include <linux/linkage.h>
 7
 8	;; ABI considerations for the divide functions
 9	;; The following registers are call-used:
10	;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
11	;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
12	;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
13	;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
14	;;
15	;; In our implementation, divu and remu are leaf functions,
16	;; while both divi and remi call into divu.
17	;; A0 is not clobbered by any of the functions.
18	;; divu does not clobber B2 either, which is taken advantage of
19	;; in remi.
20	;; divi uses B5 to hold the original return address during
21	;; the call to divu.
22	;; remi uses B2 and A5 to hold the input values during the
23	;; call to divu.  It stores B3 in on the stack.
24
25	.text
26ENTRY(__c6xabi_divi)
27	call	.s2	__c6xabi_divu
28||	mv	.d2	B3, B5
29||	cmpgt	.l1	0, A4, A1
30||	cmpgt	.l2	0, B4, B1
31
32   [A1]	neg	.l1	A4, A4
33|| [B1]	neg	.l2	B4, B4
34||	xor	.s1x	A1, B1, A1
35   [A1] addkpc	.s2	_divu_ret, B3, 4
36_divu_ret:
37	neg	.l1	A4, A4
38||	mv	.l2	B3,B5
39||	ret	.s2	B5
40	nop		5
41ENDPROC(__c6xabi_divi)