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
26
27ENTRY(__c6xabi_remi)
28	stw	.d2t2	B3, *B15--[2]
29||	cmpgt	.l1	0, A4, A1
30||	cmpgt	.l2	0, B4, B2
31||	mv	.s1	A4, A5
32||	call	.s2	__c6xabi_divu
33
34   [A1]	neg	.l1	A4, A4
35|| [B2]	neg	.l2	B4, B4
36||	xor	.s2x	B2, A1, B0
37||	mv	.d2	B4, B2
38
39   [B0]	addkpc	.s2	_divu_ret_1, B3, 1
40  [!B0] addkpc	.s2	_divu_ret_2, B3, 1
41	nop	2
42_divu_ret_1:
43	neg	.l1	A4, A4
44_divu_ret_2:
45	ldw	.d2t2	*++B15[2], B3
46
47	mpy32	.m1x	A4, B2, A6
48	nop		3
49	ret	.s2	B3
50	sub	.l1	A5, A6, A4
51	nop	4
52ENDPROC(__c6xabi_remi)
53