1/*-
2 * Copyright (c) 2012 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Matt Thomas of 3am Software Foundry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <machine/asm.h>
31
32RCSID("$NetBSD: __aeabi_uldivmod.S,v 1.9 2014/05/06 16:02:11 joerg Exp $")
33
34/*
35 * typedef struct { unsigned long long quo, rem } ulldiv_t;
36 * __value_in_regs ulldiv_t __aeabi_uldivmod(unsigned long long n,
37 *	unsigned long long d);
38 */
39
40ENTRY(__aeabi_uldivmod)
41#ifdef __ARM_EABI__
42# if !defined(__ARM_DWARF_EH__)
43	.fnstart
44#endif
45	.cfi_startproc
46#endif
47#if !defined(_KERNEL) && !defined(_STANDALONE)
48#if !defined(__thumb__)
49	orrs	ip, r2, r3
50	beq	.Ldivbyzero
51#elif defined(_ARM_ARCH_T2)
52	cbnz	r2, 1f
53	cbz	r3, .Ldivbyzero
541:
55#else
56	cmp	r2, #0
57	bne	1f
58	cmp	r3, #0
59	beq	.Ldivbyzero
601:
61#endif
62#endif
63
64	push	{r4,lr}
65#ifdef __ARM_EABI__
66# if !defined(__ARM_DWARF_EH__)
67	.save	{r4,lr}
68# endif
69	.cfi_def_cfa_offset 8
70	.cfi_offset 14, -4
71	.cfi_offset 4, -8
72#endif
73	sub	sp, sp, #16
74#ifdef __ARM_EABI__
75	.cfi_def_cfa_offset 24
76#endif
77#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
78	add	r4, sp, #8
79#else
80	mov	r4, sp
81	adds	r4, r4, #8
82#endif
83	str	r4, [sp]
84	bl	PLT_SYM(__qdivrem)
85	add	sp, sp, #8
86#ifdef __ARM_EABI__
87	.cfi_def_cfa_offset 16
88	.cfi_offset 3, -12
89	.cfi_offset 2, -16
90#endif
91	/*
92	 * The remainder is already on the stack just waiting to be popped
93	 * into r2/r3.
94	 */
95	pop	{r2-r4,pc}
96
97#if !defined(_KERNEL) && !defined(_STANDALONE)
98.Ldivbyzero:
99	push	{r0-r1,r4,lr}
100#ifdef __ARM_EABI__
101# if !defined(__ARM_DWARF_EH__)
102	.save	{r0-r1,r4,lr}
103# endif
104	.cfi_def_cfa_offset 16
105	.cfi_offset 14, -4
106	.cfi_offset 4, -8
107#endif
108#ifdef __thumb__
109	movs	r0, #0
110	mvns	r0, r0
111#else
112	mvn	r0, #0
113#endif
114	movs	r1, r0
115	bl	PLT_SYM(__aeabi_ldiv0)
116	pop	{r2-r4,pc}
117#endif
118#ifdef __ARM_EABI__
119	.cfi_endproc
120# if !defined(__ARM_DWARF_EH__)
121	.fnend
122# endif
123#endif
124END(__aeabi_uldivmod)
125