xref: /freebsd/lib/libc/arm/aeabi/aeabi_asm_double.S (revision a0ee8cc6) 
1/*
2 * Copyright (C) 2014 Andrew Turner
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <machine/asm.h>
29__FBSDID("$FreeBSD$");
30
31#define	PCR_Z	(1 << 30)
32#define	PCR_C	(1 << 29)
33
34/*
35 * These functions return the result in the CPSR register.
36 *
37 * For __aeabi_cdcmple:
38 *      Z C
39 *   LT 0 0
40 *   EQ 1 1
41 * else 0 1
42 *
43 * __aeabi_cdrcmple is the same as __aeabi_cdcmple, however the arguments
44 * have been swapped.
45 */
46ENTRY(__aeabi_cdcmple)
47	push	{r4, r5, r6, r7, ip, lr}
48
49	/* Backup the input registers */
50	mov	r4, r0
51	mov	r5, r1
52	mov	r6, r2
53	mov	r7, r3
54	/* Is it less than? */
55	bl	__aeabi_dcmplt
56	cmp	r0, #1
57	bne	1f
58	/* Yes, clear Z and C */
59	mov	ip, #(0)
60	b	99f
61
621:
63	/* Restore the input regsters for the next function call */
64	mov	r0, r4
65	mov	r1, r5
66	mov	r2, r6
67	mov	r3, r7
68	/* Is it equal? */
69	bl	__aeabi_dcmpeq
70	cmp	r0, #1
71	bne	2f
72	/* Yes, set Z and C */
73	mov	ip, #(PCR_Z | PCR_C)
74	b 99f
75
762:
77	/* Not less than or equal, set C and clear Z */
78	mov	ip, #(PCR_C)
79
8099:
81	msr	cpsr_c, ip
82	pop	{r4, r5, r6, r7, ip, pc}
83END(__aeabi_cdcmple)
84
85ENTRY(__aeabi_cdrcmple)
86	/* Swap the first half of the arguments */
87	mov	ip, r0
88	mov	r0, r2
89	mov	r2, ip
90
91	/* And the second half */
92	mov	ip, r1
93	mov	r1, r3
94	mov	r3, ip
95
96	b	__aeabi_cdcmple
97END(__aeabi_cdrcmple)
98
99/*
100 * This is just like __aeabi_cdcmple except it will not throw an exception
101 * in the presence of a quiet NaN. If either argument is a signalling NaN we
102 * will still signal.
103 */
104ENTRY(__aeabi_cdcmpeq)
105	/* Check if we can call __aeabi_cfcmple safely */
106	push	{r0, r1, r2, r3, r4, lr}
107	bl	__aeabi_cdcmpeq_helper
108	cmp	r0, #1
109	pop	{r0, r1, r2, r3, r4, lr}
110	beq	1f
111
112	bl	__aeabi_cdcmple
113	RET
114
1151:
116	mov	ip, #(PCR_C)
117	msr	cpsr_c, ip
118	RET
119END(__aeabi_cdcmpeq)
120
121	.section .note.GNU-stack,"",%progbits
122