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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