uapi/asm/signal.h

0001 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
0002 /*
0003  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
0004  *
0005  * This program is free software; you can redistribute it and/or modify
0006  * it under the terms of the GNU General Public License version 2 as
0007  * published by the Free Software Foundation.
0008  *
0009  * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
0010  */
0011
0012 #ifndef _ASM_ARC_SIGNAL_H
0013 #define _ASM_ARC_SIGNAL_H
0014
0015 /*
0016  * This is much needed for ARC sigreturn optimization.
0017  * This allows uClibc to piggback the addr of a sigreturn stub in sigaction,
0018  * which allows sigreturn based re-entry into kernel after handling signal.
0019  * W/o this kernel needs to "synthesize" the sigreturn trampoline on user
0020  * mode stack which in turn forces the following:
0021  * -TLB Flush (after making the stack page executable)
0022  * -Cache line Flush (to make I/D Cache lines coherent)
0023  */
0024 #define SA_RESTORER 0x04000000
0025
0026 #include <asm-generic/signal.h>
0027
0028 #endif /* _ASM_ARC_SIGNAL_H */