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 /* Unlocked - don't care if this is a bit off */
  44 int nsegfaults = 0;
  45
  46 struct {
  47         unsigned long address;
  48         int is_write;
  49         int pid;
  50         unsigned long sp;
  51         int is_user;
  52 } segfault_record[1024];
  53
  54 void segv_handler(int sig, union uml_pt_regs *regs)
  55 {
  56         int index, max;
  57
  58         if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
  59                 bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs),
  60                          UPT_FAULT_WRITE(regs));
  61                 return;
  62         }
  63         max = sizeof(segfault_record)/sizeof(segfault_record[0]);
  64         index = next_trap_index(max);
  65
  66         nsegfaults++;
  67         segfault_record[index].address = UPT_FAULT_ADDR(regs);
  68         segfault_record[index].pid = os_getpid();
  69         segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
  70         segfault_record[index].sp = UPT_SP(regs);
  71         segfault_record[index].is_user = UPT_IS_USER(regs);
  72         segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
  73              UPT_IS_USER(regs), regs);
  74 }
  75
  76 void usr2_handler(int sig, union uml_pt_regs *regs)
  77 {
  78         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
  79 }
  80
  81 struct signal_info sig_info[] = {
  82         [ SIGTRAP ] { .handler          = relay_signal,
  83                       .is_irq           = 0 },
  84         [ SIGFPE ] { .handler           = relay_signal,
  85                      .is_irq            = 0 },
  86         [ SIGILL ] { .handler           = relay_signal,
  87                      .is_irq            = 0 },
  88         [ SIGWINCH ] { .handler         = winch,
  89                        .is_irq          = 1 },
  90         [ SIGBUS ] { .handler           = bus_handler,
  91                      .is_irq            = 0 },
  92         [ SIGSEGV] { .handler           = segv_handler,
  93                      .is_irq            = 0 },
  94         [ SIGIO ] { .handler            = sigio_handler,
  95                     .is_irq             = 1 },
  96         [ SIGVTALRM ] { .handler        = timer_handler,
  97                         .is_irq         = 1 },
  98         [ SIGALRM ] { .handler          = timer_handler,
  99                       .is_irq           = 1 },
 100         [ SIGUSR2 ] { .handler          = usr2_handler,
 101                       .is_irq           = 0 },
 102 };
 103
 104 void do_longjmp(void *b, int val)
 105 {
 106         sigjmp_buf *buf = b;
 107
 108         siglongjmp(*buf, val);
 109 }
 110
 111 /*
 112  * Overrides for Emacs so that we follow Linus's tabbing style.
 113  * Emacs will notice this stuff at the end of the file and automatically
 114  * adjust the settings for this buffer only.  This must remain at the end
 115  * of the file.
 116  * ---------------------------------------------------------------------------
 117  * Local variables:
 118  * c-file-style: "linux"
 119  * End:
 120  */