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 register kernel_ulong_t r28 __asm__("r28");
40 __asm__ __volatile__("copy %%r19, %%r4\n\t"
41 "ble 0x100(%%sr2, %%r0)\n\t"
42 "copy %1, %%r20\n\t"
43 "copy %%r4, %%r19\n\t"
44 : "=r"(r28)
45 : "r"(nr)
46 : "memory", "%r1", "%r2", "%r4",
47 "%r21", "%r22", "%r23", "%r24", "%r25", "%r26" );
48 return r28;
49 }
50 # define raw_syscall_0 raw_syscall_0
51
52 #endif /* !STRACE_RAW_SYSCALL_H */
53