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

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