OpenRISC: Signal handling

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

arch/openrisc/include/asm/sigcontext.h

+/*
+ * OpenRISC Linux
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * OpenRISC implementation:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ * et al.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __ASM_OPENRISC_SIGCONTEXT_H
+#define __ASM_OPENRISC_SIGCONTEXT_H
+
+#include <asm/ptrace.h>
+
+/* This struct is saved by setup_frame in signal.c, to keep the current
+   context while a signal handler is executed. It's restored by sys_sigreturn.
+
+   To keep things simple, we use pt_regs here even though normally you just
+   specify the list of regs to save. Then we can use copy_from_user on the
+   entire regs instead of a bunch of get_user's as well...
+*/
+
+struct sigcontext {
+	struct pt_regs regs;  /* needs to be first */
+	unsigned long oldmask;
+	unsigned long usp;    /* usp before stacking this gunk on it */
+};
+
+#endif /* __ASM_OPENRISC_SIGCONTEXT_H */