1. 根目录:
2. arch
3. sh
4. include
5. uapi
6. asm
7. signal.h

#ifndef __ASM_SH_SIGNAL_H
#define __ASM_SH_SIGNAL_H

#define SA_RESTORER	0x04000000

#include <asm-generic/signal.h>

#ifndef __KERNEL__
struct old_sigaction {
	__sighandler_t sa_handler;
	old_sigset_t sa_mask;
	unsigned long sa_flags;
	void (*sa_restorer)(void);
};
#endif

#endif /* __ASM_SH_SIGNAL_H */