diff options
Diffstat (limited to 'kernel/arch/arc/include/uapi/asm/signal.h')
| -rw-r--r-- | kernel/arch/arc/include/uapi/asm/signal.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/arch/arc/include/uapi/asm/signal.h b/kernel/arch/arc/include/uapi/asm/signal.h new file mode 100644 index 000000000..fad62f7f4 --- /dev/null +++ b/kernel/arch/arc/include/uapi/asm/signal.h @@ -0,0 +1,27 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 + */ + +#ifndef _ASM_ARC_SIGNAL_H +#define _ASM_ARC_SIGNAL_H + +/* + * This is much needed for ARC sigreturn optimization. + * This allows uClibc to piggback the addr of a sigreturn stub in sigaction, + * which allows sigreturn based re-entry into kernel after handling signal. + * W/o this kernel needs to "synthesize" the sigreturn trampoline on user + * mode stack which in turn forces the following: + * -TLB Flush (after making the stack page executable) + * -Cache line Flush (to make I/D Cache lines coherent) + */ +#define SA_RESTORER 0x04000000 + +#include <asm-generic/signal.h> + +#endif /* _ASM_ARC_SIGNAL_H */ |