1245548Sandrew/*
2245548Sandrew * Copyright (C) 2012 Andrew Turner
3245548Sandrew * All rights reserved.
4245548Sandrew *
5245548Sandrew * Redistribution and use in source and binary forms, with or without
6245548Sandrew * modification, are permitted provided that the following conditions
7245548Sandrew * are met:
8245548Sandrew * 1. Redistributions of source code must retain the above copyright
9245548Sandrew *    notice, this list of conditions and the following disclaimer.
10245548Sandrew * 2. Redistributions in binary form must reproduce the above copyright
11245548Sandrew *    notice, this list of conditions and the following disclaimer in the
12245548Sandrew *    documentation and/or other materials provided with the distribution.
13245548Sandrew *
14245548Sandrew * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15245548Sandrew * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16245548Sandrew * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17245548Sandrew * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18245548Sandrew * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19245548Sandrew * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20245548Sandrew * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21245548Sandrew * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22245548Sandrew * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23245548Sandrew * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24245548Sandrew * SUCH DAMAGE.
25245548Sandrew *
26245548Sandrew */
27245548Sandrew
28245548Sandrew#include <machine/asm.h>
29245548Sandrew__FBSDID("$FreeBSD$");
30245548Sandrew
31245548Sandrew#ifdef __ARM_EABI__
32245548Sandrew
33245548Sandrew/*
34245548Sandrew * These calculate:
35245548Sandrew * q = n / m
36245548Sandrew * With a remainer r.
37245548Sandrew *
38245548Sandrew * They take n in {r0, r1} and m in {r2, r3} then pass them into the
39245548Sandrew * helper function. The hepler functions return q in {r0, r1} as
40245548Sandrew * required by the API spec however r is returned on the stack. The
41245548Sandrew * ABI required us to return r in {r2, r3}.
42245548Sandrew *
43245548Sandrew * We need to allocate 8 bytes on the stack to store r, the link
44245548Sandrew * register, and a pointer to the space where the helper function
45245548Sandrew * will write r to. After returning from the helper fuinction we load
46245548Sandrew * the old link register and r from the stack and return.
47245548Sandrew */
48245548SandrewENTRY_NP(__aeabi_ldivmod)
49245548Sandrew	sub	sp, sp, #8	/* Space for the remainder */
50245548Sandrew	stmfd	sp!, {sp, lr}	/* Save a pointer to the above space and lr */
51245548Sandrew	bl	PIC_SYM(_C_LABEL(__kern_ldivmod), PLT)
52245548Sandrew	ldr	lr, [sp, #4]	/* Restore lr */
53245548Sandrew	add	sp, sp, #8	/* Move sp to the remainder value */
54245548Sandrew	ldmfd	sp!, {r2, r3}	/* Load the remainder */
55245548Sandrew	RET
56248367SandrewEND(__aeabi_ldivmod)
57245548Sandrew
58245548SandrewENTRY_NP(__aeabi_uldivmod)
59245548Sandrew	sub	sp, sp, #8	/* Space for the remainder */
60245548Sandrew	stmfd	sp!, {sp, lr}	/* Save a pointer to the above space and lr */
61245548Sandrew	bl	PIC_SYM(_C_LABEL(__qdivrem), PLT)
62245548Sandrew	ldr	lr, [sp, #4]	/* Restore lr */
63245548Sandrew	add	sp, sp, #8	/* Move sp to the remainder value */
64245548Sandrew	ldmfd	sp!, {r2, r3}	/* Load the remainder */
65245548Sandrew	RET
66248367SandrewEND(__aeabi_uldivmod)
67245548Sandrew
68245548Sandrew#endif
69245548Sandrew
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