1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by Ralf Baechle
7 * Copyright (C) 1999 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_SIGNAL_H
10#define _ASM_SIGNAL_H
11
12#include <linux/types.h>
13
14#define _NSIG		128
15#define _NSIG_BPW	32
16#define _NSIG_WORDS	(_NSIG / _NSIG_BPW)
17
18typedef struct {
19	unsigned long sig[_NSIG_WORDS];
20} sigset_t;
21
22typedef unsigned long old_sigset_t;		/* at least 32 bits */
23
24#define SIGHUP		 1	/* Hangup (POSIX).  */
25#define SIGINT		 2	/* Interrupt (ANSI).  */
26#define SIGQUIT		 3	/* Quit (POSIX).  */
27#define SIGILL		 4	/* Illegal instruction (ANSI).  */
28#define SIGTRAP		 5	/* Trace trap (POSIX).  */
29#define SIGIOT		 6	/* IOT trap (4.2 BSD).  */
30#define SIGABRT		 SIGIOT	/* Abort (ANSI).  */
31#define SIGEMT		 7
32#define SIGFPE		 8	/* Floating-point exception (ANSI).  */
33#define SIGKILL		 9	/* Kill, unblockable (POSIX).  */
34#define SIGBUS		10	/* BUS error (4.2 BSD).  */
35#define SIGSEGV		11	/* Segmentation violation (ANSI).  */
36#define SIGSYS		12
37#define SIGPIPE		13	/* Broken pipe (POSIX).  */
38#define SIGALRM		14	/* Alarm clock (POSIX).  */
39#define SIGTERM		15	/* Termination (ANSI).  */
40#define SIGUSR1		16	/* User-defined signal 1 (POSIX).  */
41#define SIGUSR2		17	/* User-defined signal 2 (POSIX).  */
42#define SIGCHLD		18	/* Child status has changed (POSIX).  */
43#define SIGCLD		SIGCHLD	/* Same as SIGCHLD (System V).  */
44#define SIGPWR		19	/* Power failure restart (System V).  */
45#define SIGWINCH	20	/* Window size change (4.3 BSD, Sun).  */
46#define SIGURG		21	/* Urgent condition on socket (4.2 BSD).  */
47#define SIGIO		22	/* I/O now possible (4.2 BSD).  */
48#define SIGPOLL		SIGIO	/* Pollable event occurred (System V).  */
49#define SIGSTOP		23	/* Stop, unblockable (POSIX).  */
50#define SIGTSTP		24	/* Keyboard stop (POSIX).  */
51#define SIGCONT		25	/* Continue (POSIX).  */
52#define SIGTTIN		26	/* Background read from tty (POSIX).  */
53#define SIGTTOU		27	/* Background write to tty (POSIX).  */
54#define SIGVTALRM	28	/* Virtual alarm clock (4.2 BSD).  */
55#define SIGPROF		29	/* Profiling alarm clock (4.2 BSD).  */
56#define SIGXCPU		30	/* CPU limit exceeded (4.2 BSD).  */
57#define SIGXFSZ		31	/* File size limit exceeded (4.2 BSD).  */
58
59/* These should not be considered constants from userland.  */
60#define SIGRTMIN	32
61#define SIGRTMAX	(_NSIG-1)
62
63/*
64 * SA_FLAGS values:
65 *
66 * SA_ONSTACK indicates that a registered stack_t will be used.
67 * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
68 * SA_RESTART flag to get restarting signals (which were the default long ago)
69 * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
70 * SA_RESETHAND clears the handler when the signal is delivered.
71 * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
72 * SA_NODEFER prevents the current signal from being masked in the handler.
73 *
74 * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
75 * Unix names RESETHAND and NODEFER respectively.
76 */
77#define SA_ONSTACK	0x08000000
78#define SA_RESETHAND	0x80000000
79#define SA_RESTART	0x10000000
80#define SA_SIGINFO	0x00000008
81#define SA_NODEFER	0x40000000
82#define SA_NOCLDWAIT	0x00010000	/* Not supported yet */
83#define SA_NOCLDSTOP	0x00000001
84
85#define SA_NOMASK	SA_NODEFER
86#define SA_ONESHOT	SA_RESETHAND
87#define SA_INTERRUPT	0x20000000	/* dummy -- ignored */
88
89#define SA_RESTORER	0x04000000
90
91/*
92 * sigaltstack controls
93 */
94#define SS_ONSTACK     1
95#define SS_DISABLE     2
96
97#define MINSIGSTKSZ    2048
98#define SIGSTKSZ       8192
99
100#ifdef __KERNEL__
101
102/*
103 * These values of sa_flags are used only by the kernel as part of the
104 * irq handling routines.
105 *
106 * SA_INTERRUPT is also used by the irq handling routines.
107 * SA_SHIRQ flag is for shared interrupt support on PCI and EISA.
108 */
109#define SA_PROBE		SA_ONESHOT
110#define SA_SAMPLE_RANDOM	SA_RESTART
111#define SA_SHIRQ		0x02000000
112
113#endif /* __KERNEL__ */
114
115#define SIG_BLOCK	1	/* for blocking signals */
116#define SIG_UNBLOCK	2	/* for unblocking signals */
117#define SIG_SETMASK	3	/* for setting the signal mask */
118#define SIG_SETMASK32	256	/* Goodie from SGI for BSD compatibility:
119				   set only the low 32 bit of the sigset.  */
120
121/* Type of a signal handler.  */
122typedef void (*__sighandler_t)(int);
123
124/* Fake signal functions */
125#define SIG_DFL	((__sighandler_t)0)	/* default signal handling */
126#define SIG_IGN	((__sighandler_t)1)	/* ignore signal */
127#define SIG_ERR	((__sighandler_t)-1)	/* error return from signal */
128
129struct sigaction {
130	unsigned int	sa_flags;
131	__sighandler_t	sa_handler;
132	sigset_t	sa_mask;
133	void		(*sa_restorer)(void);
134	int		sa_resv[1];	/* reserved */
135};
136
137struct k_sigaction {
138	struct sigaction sa;
139};
140
141/* IRIX compatible stack_t  */
142typedef struct sigaltstack {
143	void *ss_sp;
144	size_t ss_size;
145	int ss_flags;
146} stack_t;
147
148#ifdef __KERNEL__
149#include <asm/sigcontext.h>
150
151/*
152 * The following break codes are or were in use for specific purposes in
153 * other MIPS operating systems.  Linux/MIPS doesn't use all of them.  The
154 * unused ones are here as placeholders; we might encounter them in
155 * non-Linux/MIPS object files or make use of them in the future.
156 */
157#define BRK_USERBP	0	/* User bp (used by debuggers) */
158#define BRK_KERNELBP	1	/* Break in the kernel */
159#define BRK_ABORT	2	/* Sometimes used by abort(3) to SIGIOT */
160#define BRK_BD_TAKEN	3	/* For bd slot emulation - not implemented */
161#define BRK_BD_NOTTAKEN	4	/* For bd slot emulation - not implemented */
162#define BRK_SSTEPBP	5	/* User bp (used by debuggers) */
163#define BRK_OVERFLOW	6	/* Overflow check */
164#define BRK_DIVZERO	7	/* Divide by zero check */
165#define BRK_RANGE	8	/* Range error check */
166#define BRK_STACKOVERFLOW 9	/* For Ada stackchecking */
167#define BRK_NORLD	10	/* No rld found - not used by Linux/MIPS */
168#define _BRK_THREADBP	11	/* For threads, user bp (used by debuggers) */
169#define BRK_MULOVF	1023	/* Multiply overflow */
170
171#endif /* defined (__KERNEL__) */
172
173#endif /* _ASM_SIGNAL_H */
174