1/*	$NetBSD: sdivsi3.S,v 1.11 2011/07/14 09:48:03 mrg Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	from: @(#)udivsi3.s	5.1 (Berkeley) 5/15/90
35 */
36
37#include <machine/asm.h>
38#if defined(LIBC_SCCS)
39	RCSID("$NetBSD: sdivsi3.S,v 1.11 2011/07/14 09:48:03 mrg Exp $")
40#endif
41
42/*
43 * IMPOTANT: This function is special.
44 *
45 * This function is an auxiliary "millicode" function that is
46 * referenced by the code generated by gcc for signed integer
47 * division.  But gcc does NOT treat a call to this function as an
48 * ordinary function call - it can clobber only R1, R2 and R3.
49 *
50 * See the definition of "divsi3_i1" in gcc/config/sh/sh.md
51 *
52 * As the consequence this function cannot be called via any
53 * indirection that assumes normal calling convention:
54 *
55 * . cannot have _PROF_PROLOGUE
56 * . cannot be called via PLT (not relevant for kernel)
57 */
58
59
60#ifdef __ELF__
61	.hidden __sdivsi3
62#endif
63
64
65/* r0 <= r4 / r5 */
66NENTRY(__sdivsi3)
67	mov	r4, r0
68	mov	r5, r1
69
70	tst	r1, r1
71	bt	.L_div_by_zero
72
73	mov	#0, r2
74	div0s	r2, r0
75	subc	r3, r3
76	subc	r2, r0
77	div0s	r1, r3
78#define DIVSTEP	rotcl r0; div1 r1, r3
79	/* repeat 32 times */
80	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
81	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
82	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
83	DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP; DIVSTEP;
84#undef DIVSTEP
85	rotcl	r0
86
87	rts
88	 addc	r2, r0
89
90.L_div_by_zero:
91	rts
92	 mov	#0, r0
93