1 /*
2 * Raw syscalls.
3 *
4 * Copyright (c) 2018 The strace developers.
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 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #ifndef STRACE_RAW_SYSCALL_H
31 #define STRACE_RAW_SYSCALL_H
32
33 # include "kernel_types.h"
34
35 static inline kernel_ulong_t
raw_syscall_0(const kernel_ulong_t nr,kernel_ulong_t * err)36 raw_syscall_0(const kernel_ulong_t nr, kernel_ulong_t *err)
37 {
38 *err = 0;
39
40 #ifdef __thumb__ /* && FRAME_POINTERS_ENABLED */
41
42 register kernel_ulong_t rt;
43 register kernel_ulong_t r0 __asm__("r0");
44 __asm__ __volatile__("mov %1,r7; mov r7,%2; swi 0x0; mov r7,%1"
45 : "=r"(r0), "=&r"(rt)
46 : "r"(nr)
47 : "memory");
48
49 #else
50
51 register kernel_ulong_t r7 __asm__("r7") = nr;
52 register kernel_ulong_t r0 __asm__("r0");
53 __asm__ __volatile__("swi 0x0"
54 : "=r"(r0)
55 : "r"(r7)
56 : "memory");
57
58 #endif
59
60 return r0;
61 }
62 # define raw_syscall_0 raw_syscall_0
63
64 #endif /* !STRACE_RAW_SYSCALL_H */
65