include/arch/i386/include/signal.h
#ifndef _I386_SIGNAL_H_
#define _I386_SIGNAL_H_

#include <sys/featuretest.h>

typedef int sig_atomic_t;

/* The following structure should match the stackframe_s structure used
 * by the kernel's context switching code.  Floating point registers should
 * be added in a different struct.
 */

#include <machine/stackframe.h>
#include <machine/fpu.h>

typedef struct stackframe_s sigregs;
struct sigframe {		/* stack frame created for signalled process */
  void (*sf_retadr)(void);
  int sf_signo;
  int sf_code;
  struct sigcontext *sf_scp;
  int sf_fp;
  void (*sf_retadr2)(void);
  struct sigcontext *sf_scpcopy;
};

struct sigcontext {
  int sc_flags;			/* sigstack state to restore (including
				 * MF_FPU_INITIALIZED)
				 */
  long sc_mask;			/* signal mask to restore */
  sigregs sc_regs;              /* register set to restore */
  union fpu_state_u sc_fpu_state;
};

#define sc_gs sc_regs.gs
#define sc_fs sc_regs.fs
#define sc_es sc_regs.es
#define sc_ds sc_regs.ds
#define sc_di sc_regs.di
#define sc_si sc_regs.si
#define sc_fp sc_regs.bp
#define sc_st sc_regs.st		/* stack top -- used in kernel */
#define sc_bx sc_regs.bx
#define sc_dx sc_regs.dx
#define sc_cx sc_regs.cx
#define sc_retreg sc_regs.retreg
#define sc_retadr sc_regs.retadr	/* return address to caller of
					save -- used in kernel */
#define sc_pc sc_regs.pc
#define sc_cs sc_regs.cs
#define sc_psw sc_regs.psw
#define sc_sp sc_regs.sp
#define sc_ss sc_regs.ss

#ifdef _MINIX
__BEGIN_DECLS
int sigreturn(struct sigcontext *_scp); 
__END_DECLS
#endif /* _MINIX */

#endif	/* !_I386_SIGNAL_H_ */
