signal.h revision 1.7 
1/* $NetBSD: signal.h,v 1.7 2003/04/28 23:16:16 bjh21 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#if defined(_NETBSD_SOURCE)
38/*
39 * Information pushed on stack when a signal is delivered.
40 * This is used by the kernel to restore state following
41 * execution of the signal handler.  It is also made available
42 * to the handler to allow it to restore state properly if
43 * a non-standard exit is performed.
44 *
45 * Note that sc_regs[] and sc_fpregs[]+sc_fpcr are inline
46 * representations of 'struct reg' and 'struct fpreg', respectively.
47 */
48#if defined(__LIBC12_SOURCE__) || defined(_KERNEL)
49struct sigcontext13 {
50	long	sc_onstack;		/* sigstack state to restore */
51	long	sc_mask;		/* signal mask to restore (old style) */
52	long	sc_pc;			/* pc to restore */
53	long	sc_ps;			/* ps to restore */
54	unsigned long sc_regs[32];	/* integer register set (see above) */
55#define	sc_sp	sc_regs[R_SP]
56	long	sc_ownedfp;		/* fp has been used */
57	unsigned long sc_fpregs[32];	/* FP register set (see above) */
58	unsigned long sc_fpcr;		/* FP control register (see above) */
59	unsigned long sc_fp_control;	/* FP software control word */
60	long	sc_reserved[2];		/* XXX */
61	long	sc_xxx[8];		/* XXX */
62};
63#endif /* __LIBC12_SOURCE__ || _KERNEL */
64
65struct sigcontext {
66	long	sc_onstack;		/* sigstack state to restore */
67	long	__sc_mask13;		/* signal mask to restore (old style) */
68	long	sc_pc;			/* pc to restore */
69	long	sc_ps;			/* ps to restore */
70	unsigned long sc_regs[32];	/* integer register set (see above) */
71#define	sc_sp	sc_regs[R_SP]
72	long	sc_ownedfp;		/* fp has been used */
73	unsigned long sc_fpregs[32];	/* FP register set (see above) */
74	unsigned long sc_fpcr;		/* FP control register (see above) */
75	unsigned long sc_fp_control;	/* FP software control word */
76	long	sc_reserved[2];		/* XXX */
77	long	sc_xxx[8];		/* XXX */
78	sigset_t sc_mask;		/* signal mask to restore (new style) */
79};
80
81/*
82 * The following macros are used to convert from a ucontext to sigcontext,
83 * and vice-versa.  This is for building a sigcontext to deliver to old-style
84 * signal handlers, and converting back (in the event the handler modifies
85 * the context).
86 */
87#define	_MCONTEXT_TO_SIGCONTEXT(uc, sc)					\
88do {									\
89	(sc)->sc_pc = (uc)->uc_mcontext.__gregs[_REG_PC];		\
90	(sc)->sc_ps = (uc)->uc_mcontext.__gregs[_REG_PS];		\
91	memcpy(&(sc)->sc_regs, &(uc)->uc_mcontext.__gregs,		\
92	    31 * sizeof(unsigned long));				\
93	if ((uc)->uc_flags & _UC_FPU) {					\
94		(sc)->sc_ownedfp = 1;					\
95		memcpy(&(sc)->sc_fpregs,				\
96		    &(uc)->uc_mcontext.__fpregs.__fp_fr,		\
97		    31 * sizeof(unsigned long));			\
98		(sc)->sc_fpcr = (uc)->uc_mcontext.__fpregs.__fp_fpcr;	\
99		/* XXX sc_fp_control */					\
100	} else								\
101		(sc)->sc_ownedfp = 0;					\
102} while (/*CONSTCOND*/0)
103
104#define	_SIGCONTEXT_TO_MCONTEXT(sc, uc)					\
105do {									\
106	(uc)->uc_mcontext.__gregs[_REG_PC] = (sc)->sc_pc;		\
107	(uc)->uc_mcontext.__gregs[_REG_PS] = (sc)->sc_ps;		\
108	memcpy(&(uc)->uc_mcontext.__gregs, &(sc)->sc_regs,		\
109	    31 * sizeof(unsigned long));				\
110	if ((sc)->sc_ownedfp) {						\
111		memcpy(&(uc)->uc_mcontext.__fpregs.__fp_fr,		\
112		    &(sc)->sc_fpregs, 31 * sizeof(unsigned long));	\
113		(sc)->sc_fpcr = (uc)->uc_mcontext.__fpregs.__fp_fpcr;	\
114		/* XXX sc_fp_control */					\
115		(uc)->uc_flags |= _UC_FPU;				\
116	}								\
117} while (/*CONSTCOND*/0)
118
119#endif /* _NETBSD_SOURCE */
120#endif /* !_ALPHA_SIGNAL_H_*/
121