signal.h revision 1.8 
1/* $NetBSD: signal.h,v 1.8 2003/10/07 17:04:19 skd Exp $ */
2
3/*
4 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#ifndef _ALPHA_SIGNAL_H_
31#define	_ALPHA_SIGNAL_H_
32
33#include <sys/featuretest.h>
34
35typedef long	sig_atomic_t;
36
37#define __HAVE_SIGINFO
38
39#if defined(_NETBSD_SOURCE)
40/*
41 * Information pushed on stack when a signal is delivered.
42 * This is used by the kernel to restore state following
43 * execution of the signal handler.  It is also made available
44 * to the handler to allow it to restore state properly if
45 * a non-standard exit is performed.
46 *
47 * Note that sc_regs[] and sc_fpregs[]+sc_fpcr are inline
48 * representations of 'struct reg' and 'struct fpreg', respectively.
49 */
50#if defined(__LIBC12_SOURCE__) || defined(_KERNEL)
51struct sigcontext13 {
52	long	sc_onstack;		/* sigstack state to restore */
53	long	sc_mask;		/* signal mask to restore (old style) */
54	long	sc_pc;			/* pc to restore */
55	long	sc_ps;			/* ps to restore */
56	unsigned long sc_regs[32];	/* integer register set (see above) */
57#define	sc_sp	sc_regs[R_SP]
58	long	sc_ownedfp;		/* fp has been used */
59	unsigned long sc_fpregs[32];	/* FP register set (see above) */
60	unsigned long sc_fpcr;		/* FP control register (see above) */
61	unsigned long sc_fp_control;	/* FP software control word */
62	long	sc_reserved[2];		/* XXX */
63	long	sc_xxx[8];		/* XXX */
64};
65#endif /* __LIBC12_SOURCE__ || _KERNEL */
66
67struct sigcontext {
68	long	sc_onstack;		/* sigstack state to restore */
69	long	__sc_mask13;		/* signal mask to restore (old style) */
70	long	sc_pc;			/* pc to restore */
71	long	sc_ps;			/* ps to restore */
72	unsigned long sc_regs[32];	/* integer register set (see above) */
73#define	sc_sp	sc_regs[R_SP]
74	long	sc_ownedfp;		/* fp has been used */
75	unsigned long sc_fpregs[32];	/* FP register set (see above) */
76	unsigned long sc_fpcr;		/* FP control register (see above) */
77	unsigned long sc_fp_control;	/* FP software control word */
78	long	sc_reserved[2];		/* XXX */
79	long	sc_xxx[8];		/* XXX */
80	sigset_t sc_mask;		/* signal mask to restore (new style) */
81};
82
83/*
84 * The following macros are used to convert from a ucontext to sigcontext,
85 * and vice-versa.  This is for building a sigcontext to deliver to old-style
86 * signal handlers, and converting back (in the event the handler modifies
87 * the context).
88 */
89#define	_MCONTEXT_TO_SIGCONTEXT(uc, sc)					\
90do {									\
91	(sc)->sc_pc = (uc)->uc_mcontext.__gregs[_REG_PC];		\
92	(sc)->sc_ps = (uc)->uc_mcontext.__gregs[_REG_PS];		\
93	memcpy(&(sc)->sc_regs, &(uc)->uc_mcontext.__gregs,		\
94	    31 * sizeof(unsigned long));				\
95	if ((uc)->uc_flags & _UC_FPU) {					\
96		(sc)->sc_ownedfp = 1;					\
97		memcpy(&(sc)->sc_fpregs,				\
98		    &(uc)->uc_mcontext.__fpregs.__fp_fr,		\
99		    31 * sizeof(unsigned long));			\
100		(sc)->sc_fpcr = (uc)->uc_mcontext.__fpregs.__fp_fpcr;	\
101		/* XXX sc_fp_control */					\
102	} else								\
103		(sc)->sc_ownedfp = 0;					\
104} while (/*CONSTCOND*/0)
105
106#define	_SIGCONTEXT_TO_MCONTEXT(sc, uc)					\
107do {									\
108	(uc)->uc_mcontext.__gregs[_REG_PC] = (sc)->sc_pc;		\
109	(uc)->uc_mcontext.__gregs[_REG_PS] = (sc)->sc_ps;		\
110	memcpy(&(uc)->uc_mcontext.__gregs, &(sc)->sc_regs,		\
111	    31 * sizeof(unsigned long));				\
112	if ((sc)->sc_ownedfp) {						\
113		memcpy(&(uc)->uc_mcontext.__fpregs.__fp_fr,		\
114		    &(sc)->sc_fpregs, 31 * sizeof(unsigned long));	\
115		(sc)->sc_fpcr = (uc)->uc_mcontext.__fpregs.__fp_fpcr;	\
116		/* XXX sc_fp_control */					\
117		(uc)->uc_flags |= _UC_FPU;				\
118	}								\
119} while (/*CONSTCOND*/0)
120
121#endif /* _NETBSD_SOURCE */
122#endif /* !_ALPHA_SIGNAL_H_*/
123