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 */