include/asm-i386/signal.h

   1 #ifndef _ASMi386_SIGNAL_H
   2 #define _ASMi386_SIGNAL_H
   3
   4 #include <linux/types.h>
   5 #include <linux/linkage.h>
   6 #include <linux/time.h>
   7 #include <linux/compiler.h>
   8
   9 /* Avoid too many header ordering problems.  */
  10 struct siginfo;
  11
  12 #ifdef __KERNEL__
  13 /* Most things should be clean enough to redefine this at will, if care
  14    is taken to make libc match.  */
  15
  16 #define _NSIG           64
  17 #define _NSIG_BPW       32
  18 #define _NSIG_WORDS     (_NSIG / _NSIG_BPW)
  19
  20 typedef unsigned long old_sigset_t;             /* at least 32 bits */
  21
  22 typedef struct {
  23         unsigned long sig[_NSIG_WORDS];
  24 } sigset_t;
  25
  26 #else
  27 /* Here we must cater to libcs that poke about in kernel headers.  */
  28
  29 #define NSIG            32
  30 typedef unsigned long sigset_t;
  31
  32 #endif /* __KERNEL__ */
  33
  34 #define SIGHUP           1
  35 #define SIGINT           2
  36 #define SIGQUIT          3
  37 #define SIGILL           4
  38 #define SIGTRAP          5
  39 #define SIGABRT          6
  40 #define SIGIOT           6
  41 #define SIGBUS           7
  42 #define SIGFPE           8
  43 #define SIGKILL          9
  44 #define SIGUSR1         10
  45 #define SIGSEGV         11
  46 #define SIGUSR2         12
  47 #define SIGPIPE         13
  48 #define SIGALRM         14
  49 #define SIGTERM         15
  50 #define SIGSTKFLT       16
  51 #define SIGCHLD         17
  52 #define SIGCONT         18
  53 #define SIGSTOP         19
  54 #define SIGTSTP         20
  55 #define SIGTTIN         21
  56 #define SIGTTOU         22
  57 #define SIGURG          23
  58 #define SIGXCPU         24
  59 #define SIGXFSZ         25
  60 #define SIGVTALRM       26
  61 #define SIGPROF         27
  62 #define SIGWINCH        28
  63 #define SIGIO           29
  64 #define SIGPOLL         SIGIO
  65 /*
  66 #define SIGLOST         29
  67 */
  68 #define SIGPWR          30
  69 #define SIGSYS          31
  70 #define SIGUNUSED       31
  71
  72 /* These should not be considered constants from userland.  */
  73 #define SIGRTMIN        32
  74 #define SIGRTMAX        _NSIG
  75
  76 /*
  77  * SA_FLAGS values:
  78  *
  79  * SA_ONSTACK indicates that a registered stack_t will be used.
  80  * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
  81  * SA_RESTART flag to get restarting signals (which were the default long ago)
  82  * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
  83  * SA_RESETHAND clears the handler when the signal is delivered.
  84  * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
  85  * SA_NODEFER prevents the current signal from being masked in the handler.
  86  *
  87  * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
  88  * Unix names RESETHAND and NODEFER respectively.
  89  */
  90 #define SA_NOCLDSTOP    0x00000001u
  91 #define SA_NOCLDWAIT    0x00000002u
  92 #define SA_SIGINFO      0x00000004u
  93 #define SA_ONSTACK      0x08000000u
  94 #define SA_RESTART      0x10000000u
  95 #define SA_NODEFER      0x40000000u
  96 #define SA_RESETHAND    0x80000000u
  97
  98 #define SA_NOMASK       SA_NODEFER
  99 #define SA_ONESHOT      SA_RESETHAND
 100 #define SA_INTERRUPT    0x20000000 /* dummy -- ignored */
 101
 102 #define SA_RESTORER     0x04000000
 103
 104 /*
 105  * sigaltstack controls
 106  */
 107 #define SS_ONSTACK      1
 108 #define SS_DISABLE      2
 109
 110 #define MINSIGSTKSZ     2048
 111 #define SIGSTKSZ        8192
 112
 113 #ifdef __KERNEL__
 114
 115 /*
 116  * These values of sa_flags are used only by the kernel as part of the
 117  * irq handling routines.
 118  *
 119  * SA_INTERRUPT is also used by the irq handling routines.
 120  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
 121  */
 122 #define SA_PROBE                SA_ONESHOT
 123 #define SA_SAMPLE_RANDOM        SA_RESTART
 124 #define SA_SHIRQ                0x04000000
 125 #endif
 126
 127 #define SIG_BLOCK          0    /* for blocking signals */
 128 #define SIG_UNBLOCK        1    /* for unblocking signals */
 129 #define SIG_SETMASK        2    /* for setting the signal mask */
 130
 131 /* Type of a signal handler.  */
 132 typedef void __signalfn_t(int);
 133 typedef __signalfn_t __user *__sighandler_t;
 134
 135 typedef void __restorefn_t(void);
 136 typedef __restorefn_t __user *__sigrestore_t;
 137
 138 #define SIG_DFL ((__sighandler_t)0)     /* default signal handling */
 139 #define SIG_IGN ((__sighandler_t)1)     /* ignore signal */
 140 #define SIG_ERR ((__sighandler_t)-1)    /* error return from signal */
 141
 142 #ifdef __KERNEL__
 143 struct old_sigaction {
 144         __sighandler_t sa_handler;
 145         old_sigset_t sa_mask;
 146         unsigned long sa_flags;
 147         __sigrestore_t sa_restorer;
 148 };
 149
 150 struct sigaction {
 151         __sighandler_t sa_handler;
 152         unsigned long sa_flags;
 153         __sigrestore_t sa_restorer;
 154         sigset_t sa_mask;               /* mask last for extensibility */
 155 };
 156
 157 struct k_sigaction {
 158         struct sigaction sa;
 159 };
 160 #else
 161 /* Here we must cater to libcs that poke about in kernel headers.  */
 162
 163 struct sigaction {
 164         union {
 165           __sighandler_t _sa_handler;
 166           void (*_sa_sigaction)(int, struct siginfo *, void *);
 167         } _u;
 168         sigset_t sa_mask;
 169         unsigned long sa_flags;
 170         void (*sa_restorer)(void);
 171 };
 172
 173 #define sa_handler      _u._sa_handler
 174 #define sa_sigaction    _u._sa_sigaction
 175
 176 #endif /* __KERNEL__ */
 177
 178 typedef struct sigaltstack {
 179         void __user *ss_sp;
 180         int ss_flags;
 181         size_t ss_size;
 182 } stack_t;
 183
 184 #ifdef __KERNEL__
 185 #include <asm/sigcontext.h>
 186
 187 #define __HAVE_ARCH_SIG_BITOPS
 188
 189 static __inline__ void sigaddset(sigset_t *set, int _sig)
 190 {
 191         __asm__("btsl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
 192 }
 193
 194 static __inline__ void sigdelset(sigset_t *set, int _sig)
 195 {
 196         __asm__("btrl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
 197 }
 198
 199 static __inline__ int __const_sigismember(sigset_t *set, int _sig)
 200 {
 201         unsigned long sig = _sig - 1;
 202         return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
 203 }
 204
 205 static __inline__ int __gen_sigismember(sigset_t *set, int _sig)
 206 {
 207         int ret;
 208         __asm__("btl %2,%1\n\tsbbl %0,%0"
 209                 : "=r"(ret) : "m"(*set), "Ir"(_sig-1) : "cc");
 210         return ret;
 211 }
 212
 213 #define sigismember(set,sig)                    \
 214         (__builtin_constant_p(sig) ?            \
 215          __const_sigismember((set),(sig)) :     \
 216          __gen_sigismember((set),(sig)))
 217
 218 static __inline__ int sigfindinword(unsigned long word)
 219 {
 220         __asm__("bsfl %1,%0" : "=r"(word) : "rm"(word) : "cc");
 221         return word;
 222 }
 223
 224 struct pt_regs;
 225 extern int FASTCALL(do_signal(struct pt_regs *regs, sigset_t *oldset));
 226
 227 #define ptrace_signal_deliver(regs, cookie)             \
 228         do {                                            \
 229                 if (current->ptrace & PT_DTRACE) {      \
 230                         current->ptrace &= ~PT_DTRACE;  \
 231                         (regs)->eflags &= ~TF_MASK;     \
 232                 }                                       \
 233         } while (0)
 234
 235 #endif /* __KERNEL__ */
 236
 237 #endif