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