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 "frame_user.h"
  22 #include "signal_user.h"
  23 #include "time_user.h"
  24 #include "task.h"
  25 #include "mode.h"
  26 #include "choose-mode.h"
  27 #include "kern_util.h"
  28 #include "user_util.h"
  29 #include "os.h"
  30
  31 void kill_child_dead(int pid)
  32 {
  33         kill(pid, SIGKILL);
  34         kill(pid, SIGCONT);
  35         do {
  36                 int n;
  37                 CATCH_EINTR(n = waitpid(pid, NULL, 0));
  38                 if (n > 0)
  39                         kill(pid, SIGCONT);
  40                 else
  41                         break;
  42         } while(1);
  43 }
  44
  45 /* Unlocked - don't care if this is a bit off */
  46 int nsegfaults = 0;
  47
  48 struct {
  49         unsigned long address;
  50         int is_write;
  51         int pid;
  52         unsigned long sp;
  53         int is_user;
  54 } segfault_record[1024];
  55
  56 void segv_handler(int sig, union uml_pt_regs *regs)
  57 {
  58         int index, max;
  59
  60         if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
  61                 bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs),
  62                          UPT_FAULT_WRITE(regs));
  63                 return;
  64         }
  65         max = sizeof(segfault_record)/sizeof(segfault_record[0]);
  66         index = next_trap_index(max);
  67
  68         nsegfaults++;
  69         segfault_record[index].address = UPT_FAULT_ADDR(regs);
  70         segfault_record[index].pid = os_getpid();
  71         segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
  72         segfault_record[index].sp = UPT_SP(regs);
  73         segfault_record[index].is_user = UPT_IS_USER(regs);
  74         segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
  75              UPT_IS_USER(regs), regs);
  76 }
  77
  78 void usr2_handler(int sig, union uml_pt_regs *regs)
  79 {
  80         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
  81 }
  82
  83 struct signal_info sig_info[] = {
  84         [ SIGTRAP ] { .handler          = relay_signal,
  85                       .is_irq           = 0 },
  86         [ SIGFPE ] { .handler           = relay_signal,
  87                      .is_irq            = 0 },
  88         [ SIGILL ] { .handler           = relay_signal,
  89                      .is_irq            = 0 },
  90         [ SIGWINCH ] { .handler         = winch,
  91                        .is_irq          = 1 },
  92         [ SIGBUS ] { .handler           = bus_handler,
  93                      .is_irq            = 0 },
  94         [ SIGSEGV] { .handler           = segv_handler,
  95                      .is_irq            = 0 },
  96         [ SIGIO ] { .handler            = sigio_handler,
  97                     .is_irq             = 1 },
  98         [ SIGVTALRM ] { .handler        = timer_handler,
  99                         .is_irq         = 1 },
 100         [ SIGALRM ] { .handler          = timer_handler,
 101                       .is_irq           = 1 },
 102         [ SIGUSR2 ] { .handler          = usr2_handler,
 103                       .is_irq           = 0 },
 104 };
 105
 106 void sig_handler(int sig, struct sigcontext sc)
 107 {
 108         CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
 109                          sig, &sc);
 110 }
 111
 112 extern int timer_irq_inited;
 113
 114 void alarm_handler(int sig, struct sigcontext sc)
 115 {
 116         if(!timer_irq_inited) return;
 117
 118         if(sig == SIGALRM)
 119                 switch_timers(0);
 120
 121         CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
 122                          sig, &sc);
 123
 124         if(sig == SIGALRM)
 125                 switch_timers(1);
 126 }
 127
 128 void do_longjmp(void *b, int val)
 129 {
 130         sigjmp_buf *buf = b;
 131
 132         siglongjmp(*buf, val);
 133 }
 134
 135 /*
 136  * Overrides for Emacs so that we follow Linus's tabbing style.
 137  * Emacs will notice this stuff at the end of the file and automatically
 138  * adjust the settings for this buffer only.  This must remain at the end
 139  * of the file.
 140  * ---------------------------------------------------------------------------
 141  * Local variables:
 142  * c-file-style: "linux"
 143  * End:
 144  */