xref: /openbmc/linux/arch/arc/include/uapi/asm/signal.h (revision e2be04c7)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
10  */
11 
12 #ifndef _ASM_ARC_SIGNAL_H
13 #define _ASM_ARC_SIGNAL_H
14 
15 /*
16  * This is much needed for ARC sigreturn optimization.
17  * This allows uClibc to piggback the addr of a sigreturn stub in sigaction,
18  * which allows sigreturn based re-entry into kernel after handling signal.
19  * W/o this kernel needs to "synthesize" the sigreturn trampoline on user
20  * mode stack which in turn forces the following:
21  * -TLB Flush (after making the stack page executable)
22  * -Cache line Flush (to make I/D Cache lines coherent)
23  */
24 #define SA_RESTORER	0x04000000
25 
26 #include <asm-generic/signal.h>
27 
28 #endif /* _ASM_ARC_SIGNAL_H */
29