arch/um/kernel/trap_user.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdlib.h>
   7 #include <errno.h>
   8 #include <setjmp.h>
   9 #include <signal.h>
  10 #include <sys/time.h>
  11 #include <sys/wait.h>
  12 #include <asm/page.h>
  13 #include <asm/unistd.h>
  14 #include <asm/ptrace.h>
  15 #include "init.h"
  16 #include "sysdep/ptrace.h"
  17 #include "sigcontext.h"
  18 #include "sysdep/sigcontext.h"
  19 #include "irq_user.h"
  20 #include "signal_user.h"
  21 #include "time_user.h"
  22 #include "task.h"
  23 #include "mode.h"
  24 #include "choose-mode.h"
  25 #include "kern_util.h"
  26 #include "user_util.h"
  27 #include "os.h"
  28
  29 void kill_child_dead(int pid)
  30 {
  31         kill(pid, SIGKILL);
  32         kill(pid, SIGCONT);
  33         do {
  34                 int n;
  35                 CATCH_EINTR(n = waitpid(pid, NULL, 0));
  36                 if (n > 0)
  37                         kill(pid, SIGCONT);
  38                 else
  39                         break;
  40         } while(1);
  41 }
  42
  43 void segv_handler(int sig, union uml_pt_regs *regs)
  44 {
  45         struct faultinfo * fi = UPT_FAULTINFO(regs);
  46
  47         if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
  48                 bad_segv(*fi, UPT_IP(regs));
  49                 return;
  50         }
  51         segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
  52 }
  53
  54 void usr2_handler(int sig, union uml_pt_regs *regs)
  55 {
  56         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
  57 }
  58
  59 struct signal_info sig_info[] = {
  60         [ SIGTRAP ] { .handler          = relay_signal,
  61                       .is_irq           = 0 },
  62         [ SIGFPE ] { .handler           = relay_signal,
  63                      .is_irq            = 0 },
  64         [ SIGILL ] { .handler           = relay_signal,
  65                      .is_irq            = 0 },
  66         [ SIGWINCH ] { .handler         = winch,
  67                        .is_irq          = 1 },
  68         [ SIGBUS ] { .handler           = bus_handler,
  69                      .is_irq            = 0 },
  70         [ SIGSEGV] { .handler           = segv_handler,
  71                      .is_irq            = 0 },
  72         [ SIGIO ] { .handler            = sigio_handler,
  73                     .is_irq             = 1 },
  74         [ SIGVTALRM ] { .handler        = timer_handler,
  75                         .is_irq         = 1 },
  76         [ SIGALRM ] { .handler          = timer_handler,
  77                       .is_irq           = 1 },
  78         [ SIGUSR2 ] { .handler          = usr2_handler,
  79                       .is_irq           = 0 },
  80 };
  81
  82 void do_longjmp(void *b, int val)
  83 {
  84         sigjmp_buf *buf = b;
  85
  86         siglongjmp(*buf, val);
  87 }
  88
  89 /*
  90  * Overrides for Emacs so that we follow Linus's tabbing style.
  91  * Emacs will notice this stuff at the end of the file and automatically
  92  * adjust the settings for this buffer only.  This must remain at the end
  93  * of the file.
  94  * ---------------------------------------------------------------------------
  95  * Local variables:
  96  * c-file-style: "linux"
  97  * End:
  98  */