[PATCH] uml: s390 preparation, sighandler interface abstraction

s390 passes parameters in registers.  So the only safe way to find out the
address of signal context, error-address and error-type (trap_no), which are
passed to signal handlers as parameters, is to declare these parameters.

So I inserted an subarch-specific macro which holds the declaration of
parameters for signal handlers.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/include/sysdep-i386/signal.h

@@ -8,6 +8,8 @@
 
 #include <signal.h>
 
+#define ARCH_SIGHDLR_PARAM int sig
+
 #define ARCH_GET_SIGCONTEXT(sc, sig) \
 	do sc = (struct sigcontext *) (&sig + 1); while(0)
 

arch/um/include/sysdep-x86_64/signal.h

@@ -6,6 +6,8 @@
 #ifndef __X86_64_SIGNAL_H_
 #define __X86_64_SIGNAL_H_
 
+#define ARCH_SIGHDLR_PARAM int sig
+
 #define ARCH_GET_SIGCONTEXT(sc, sig_addr) \
 	do { \
 		struct ucontext *__uc; \

arch/um/os-Linux/signal.c

@@ -8,7 +8,7 @@
 #include "mode.h"
 #include "sysdep/signal.h"
 
-void sig_handler(int sig)
+void sig_handler(ARCH_SIGHDLR_PARAM)
 {
 	struct sigcontext *sc;
 
@@ -19,7 +19,7 @@ void sig_handler(int sig)
 
 extern int timer_irq_inited;
 
-void alarm_handler(int sig)
+void alarm_handler(ARCH_SIGHDLR_PARAM)
 {
 	struct sigcontext *sc;