include/asm-i386/signal.h

   1 #ifndef _ASMi386_SIGNAL_H
   2 #define _ASMi386_SIGNAL_H
   3
   4 #include <linux/types.h>
   5
   6 /* Avoid too many header ordering problems.  */
   7 struct siginfo;
   8
   9 #ifdef __KERNEL__
  10 /* Most things should be clean enough to redefine this at will, if care
  11    is taken to make libc match.  */
  12
  13 #define _NSIG           64
  14 #define _NSIG_BPW       32
  15 #define _NSIG_WORDS     (_NSIG / _NSIG_BPW)
  16
  17 typedef unsigned long old_sigset_t;             /* at least 32 bits */
  18
  19 typedef struct {
  20         unsigned long sig[_NSIG_WORDS];
  21 } sigset_t;
  22
  23 #else
  24 /* Here we must cater to libcs that poke about in kernel headers.  */
  25
  26 #define NSIG            32
  27 typedef unsigned long sigset_t;
  28
  29 #endif /* __KERNEL__ */
  30
  31 #define SIGHUP           1
  32 #define SIGINT           2
  33 #define SIGQUIT          3
  34 #define SIGILL           4
  35 #define SIGTRAP          5
  36 #define SIGABRT          6
  37 #define SIGIOT           6
  38 #define SIGBUS           7
  39 #define SIGFPE           8
  40 #define SIGKILL          9
  41 #define SIGUSR1         10
  42 #define SIGSEGV         11
  43 #define SIGUSR2         12
  44 #define SIGPIPE         13
  45 #define SIGALRM         14
  46 #define SIGTERM         15
  47 #define SIGSTKFLT       16
  48 #define SIGCHLD         17
  49 #define SIGCONT         18
  50 #define SIGSTOP         19
  51 #define SIGTSTP         20
  52 #define SIGTTIN         21
  53 #define SIGTTOU         22
  54 #define SIGURG          23
  55 #define SIGXCPU         24
  56 #define SIGXFSZ         25
  57 #define SIGVTALRM       26
  58 #define SIGPROF         27
  59 #define SIGWINCH        28
  60 #define SIGIO           29
  61 #define SIGPOLL         SIGIO
  62 /*
  63 #define SIGLOST         29
  64 */
  65 #define SIGPWR          30
  66 #define SIGSYS          31
  67 #define SIGUNUSED       31
  68
  69 /* These should not be considered constants from userland.  */
  70 #define SIGRTMIN        32
  71 #define SIGRTMAX        (_NSIG-1)
  72
  73 /*
  74  * SA_FLAGS values:
  75  *
  76  * SA_ONSTACK indicates that a registered stack_t will be used.
  77  * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
  78  * SA_RESTART flag to get restarting signals (which were the default long ago)
  79  * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
  80  * SA_RESETHAND clears the handler when the signal is delivered.
  81  * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
  82  * SA_NODEFER prevents the current signal from being masked in the handler.
  83  *
  84  * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
  85  * Unix names RESETHAND and NODEFER respectively.
  86  */
  87 #define SA_NOCLDSTOP    0x00000001
  88 #define SA_NOCLDWAIT    0x00000002 /* not supported yet */
  89 #define SA_SIGINFO      0x00000004
  90 #define SA_ONSTACK      0x08000000
  91 #define SA_RESTART      0x10000000
  92 #define SA_NODEFER      0x40000000
  93 #define SA_RESETHAND    0x80000000
  94
  95 #define SA_NOMASK       SA_NODEFER
  96 #define SA_ONESHOT      SA_RESETHAND
  97 #define SA_INTERRUPT    0x20000000 /* dummy -- ignored */
  98
  99 #define SA_RESTORER     0x04000000
 100
 101 /*
 102  * sigaltstack controls
 103  */
 104 #define SS_ONSTACK      1
 105 #define SS_DISABLE      2
 106
 107 #define MINSIGSTKSZ     2048
 108 #define SIGSTKSZ        8192
 109
 110 #ifdef __KERNEL__
 111
 112 /*
 113  * These values of sa_flags are used only by the kernel as part of the
 114  * irq handling routines.
 115  *
 116  * SA_INTERRUPT is also used by the irq handling routines.
 117  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
 118  */
 119 #define SA_PROBE                SA_ONESHOT
 120 #define SA_SAMPLE_RANDOM        SA_RESTART
 121 #define SA_SHIRQ                0x04000000
 122 #endif
 123
 124 #define SIG_BLOCK          0    /* for blocking signals */
 125 #define SIG_UNBLOCK        1    /* for unblocking signals */
 126 #define SIG_SETMASK        2    /* for setting the signal mask */
 127
 128 /* Type of a signal handler.  */
 129 typedef void (*__sighandler_t)(int);
 130
 131 #define SIG_DFL ((__sighandler_t)0)     /* default signal handling */
 132 #define SIG_IGN ((__sighandler_t)1)     /* ignore signal */
 133 #define SIG_ERR ((__sighandler_t)-1)    /* error return from signal */
 134
 135 #ifdef __KERNEL__
 136 struct old_sigaction {
 137         __sighandler_t sa_handler;
 138         old_sigset_t sa_mask;
 139         unsigned long sa_flags;
 140         void (*sa_restorer)(void);
 141 };
 142
 143 struct sigaction {
 144         __sighandler_t sa_handler;
 145         unsigned long sa_flags;
 146         void (*sa_restorer)(void);
 147         sigset_t sa_mask;               /* mask last for extensibility */
 148 };
 149
 150 struct k_sigaction {
 151         struct sigaction sa;
 152 };
 153 #else
 154 /* Here we must cater to libcs that poke about in kernel headers.  */
 155
 156 struct sigaction {
 157         union {
 158           __sighandler_t _sa_handler;
 159           void (*_sa_sigaction)(int, struct siginfo *, void *);
 160         } _u;
 161         sigset_t sa_mask;
 162         unsigned long sa_flags;
 163         void (*sa_restorer)(void);
 164 };
 165
 166 #define sa_handler      _u._sa_handler
 167 #define sa_sigaction    _u._sa_sigaction
 168
 169 #endif /* __KERNEL__ */
 170
 171 typedef struct sigaltstack {
 172         void *ss_sp;
 173         int ss_flags;
 174         size_t ss_size;
 175 } stack_t;
 176
 177 #ifdef __KERNEL__
 178 #include <asm/sigcontext.h>
 179
 180 #define __HAVE_ARCH_SIG_BITOPS
 181
 182 extern __inline__ void sigaddset(sigset_t *set, int _sig)
 183 {
 184         __asm__("btsl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
 185 }
 186
 187 extern __inline__ void sigdelset(sigset_t *set, int _sig)
 188 {
 189         __asm__("btrl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
 190 }
 191
 192 extern __inline__ int __const_sigismember(sigset_t *set, int _sig)
 193 {
 194         unsigned long sig = _sig - 1;
 195         return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
 196 }
 197
 198 extern __inline__ int __gen_sigismember(sigset_t *set, int _sig)
 199 {
 200         int ret;
 201         __asm__("btl %2,%1\n\tsbbl %0,%0"
 202                 : "=r"(ret) : "m"(*set), "Ir"(_sig-1) : "cc");
 203         return ret;
 204 }
 205
 206 #define sigismember(set,sig)                    \
 207         (__builtin_constant_p(sig) ?            \
 208          __const_sigismember((set),(sig)) :     \
 209          __gen_sigismember((set),(sig)))
 210
 211 #define sigmask(sig)    (1UL << ((sig) - 1))
 212
 213 extern __inline__ int sigfindinword(unsigned long word)
 214 {
 215         __asm__("bsfl %1,%0" : "=r"(word) : "rm"(word) : "cc");
 216         return word;
 217 }
 218
 219 #endif /* __KERNEL__ */
 220
 221 #endif