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/ptrace.h>
  12 #include <sys/wait.h>
  13 #include <asm/page.h>
  14 #include <asm/unistd.h>
  15 #include <asm/ptrace.h>
  16 #include "init.h"
  17 #include "sysdep/ptrace.h"
  18 #include "sigcontext.h"
  19 #include "sysdep/sigcontext.h"
  20 #include "irq_user.h"
  21 #include "signal_user.h"
  22 #include "time_user.h"
  23 #include "task.h"
  24 #include "mode.h"
  25 #include "choose-mode.h"
  26 #include "kern_util.h"
  27 #include "user_util.h"
  28 #include "os.h"
  29
  30 void kill_child_dead(int pid)
  31 {
  32         kill(pid, SIGKILL);
  33         kill(pid, SIGCONT);
  34         do {
  35                 int n;
  36                 CATCH_EINTR(n = waitpid(pid, NULL, 0));
  37                 if (n > 0)
  38                         kill(pid, SIGCONT);
  39                 else
  40                         break;
  41         } while(1);
  42 }
  43
  44 /* Unlocked - don't care if this is a bit off */
  45 int nsegfaults = 0;
  46
  47 struct {
  48         unsigned long address;
  49         int is_write;
  50         int pid;
  51         unsigned long sp;
  52         int is_user;
  53 } segfault_record[1024];
  54
  55 void segv_handler(int sig, union uml_pt_regs *regs)
  56 {
  57         int index, max;
  58
  59         if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
  60                 bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs),
  61                          UPT_FAULT_WRITE(regs));
  62                 return;
  63         }
  64         max = sizeof(segfault_record)/sizeof(segfault_record[0]);
  65         index = next_trap_index(max);
  66
  67         nsegfaults++;
  68         segfault_record[index].address = UPT_FAULT_ADDR(regs);
  69         segfault_record[index].pid = os_getpid();
  70         segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
  71         segfault_record[index].sp = UPT_SP(regs);
  72         segfault_record[index].is_user = UPT_IS_USER(regs);
  73         segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
  74              UPT_IS_USER(regs), regs);
  75 }
  76
  77 void usr2_handler(int sig, union uml_pt_regs *regs)
  78 {
  79         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
  80 }
  81
  82 struct signal_info sig_info[] = {
  83         [ SIGTRAP ] { .handler          = relay_signal,
  84                       .is_irq           = 0 },
  85         [ SIGFPE ] { .handler           = relay_signal,
  86                      .is_irq            = 0 },
  87         [ SIGILL ] { .handler           = relay_signal,
  88                      .is_irq            = 0 },
  89         [ SIGWINCH ] { .handler         = winch,
  90                        .is_irq          = 1 },
  91         [ SIGBUS ] { .handler           = bus_handler,
  92                      .is_irq            = 0 },
  93         [ SIGSEGV] { .handler           = segv_handler,
  94                      .is_irq            = 0 },
  95         [ SIGIO ] { .handler            = sigio_handler,
  96                     .is_irq             = 1 },
  97         [ SIGVTALRM ] { .handler        = timer_handler,
  98                         .is_irq         = 1 },
  99         [ SIGALRM ] { .handler          = timer_handler,
 100                       .is_irq           = 1 },
 101         [ SIGUSR2 ] { .handler          = usr2_handler,
 102                       .is_irq           = 0 },
 103 };
 104
 105 void do_longjmp(void *b, int val)
 106 {
 107         sigjmp_buf *buf = b;
 108
 109         siglongjmp(*buf, val);
 110 }
 111
 112 /*
 113  * Overrides for Emacs so that we follow Linus's tabbing style.
 114  * Emacs will notice this stuff at the end of the file and automatically
 115  * adjust the settings for this buffer only.  This must remain at the end
 116  * of the file.
 117  * ---------------------------------------------------------------------------
 118  * Local variables:
 119  * c-file-style: "linux"
 120  * End:
 121  */