1 /* $NetBSD: stack_pointer.h,v 1.1 2024/04/22 07:24:22 pho Exp $ */
2
3 /*
4 * Copyright (c) 2024 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/stdbool.h>
30 #include <sys/stdint.h>
31
32 #define LOAD_SP(var) \
33 do { \
34 register void* tmp __asm__("x0"); \
35 __asm__( \
36 "mov %0, sp" \
37 : "=r"(tmp) \
38 ); \
39 (var) = tmp; \
40 } while (0)
41
42 #define MISALIGN_SP \
43 __asm__ volatile ( \
44 "sub sp, sp, #8" \
45 )
46
47 #define FIX_SP \
48 __asm__ volatile ( \
49 "add sp, sp, #8" \
50 )
51
52 static inline bool
is_sp_aligned(uintptr_t sp)53 is_sp_aligned(uintptr_t sp)
54 {
55 return sp % 16 == 0;
56 }
57