arch/arc/include/uapi/asm/signal.h

   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 */