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         while(waitpid(pid, NULL, 0) > 0) kill(pid, SIGCONT);
  36 }
  37
  38 /* Unlocked - don't care if this is a bit off */
  39 int nsegfaults = 0;
  40
  41 struct {
  42         unsigned long address;
  43         int is_write;
  44         int pid;
  45         unsigned long sp;
  46         int is_user;
  47 } segfault_record[1024];
  48
  49 void segv_handler(int sig, union uml_pt_regs *regs)
  50 {
  51         int index, max;
  52
  53         if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
  54                 bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs),
  55                          UPT_FAULT_WRITE(regs));
  56                 return;
  57         }
  58         max = sizeof(segfault_record)/sizeof(segfault_record[0]);
  59         index = next_trap_index(max);
  60
  61         nsegfaults++;
  62         segfault_record[index].address = UPT_FAULT_ADDR(regs);
  63         segfault_record[index].pid = os_getpid();
  64         segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
  65         segfault_record[index].sp = UPT_SP(regs);
  66         segfault_record[index].is_user = UPT_IS_USER(regs);
  67         segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
  68              UPT_IS_USER(regs), regs);
  69 }
  70
  71 void usr2_handler(int sig, union uml_pt_regs *regs)
  72 {
  73         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
  74 }
  75
  76 struct signal_info sig_info[] = {
  77         [ SIGTRAP ] { .handler          = relay_signal,
  78                       .is_irq           = 0 },
  79         [ SIGFPE ] { .handler           = relay_signal,
  80                      .is_irq            = 0 },
  81         [ SIGILL ] { .handler           = relay_signal,
  82                      .is_irq            = 0 },
  83         [ SIGWINCH ] { .handler         = winch,
  84                        .is_irq          = 1 },
  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;
 106
 107 void alarm_handler(int sig, struct sigcontext sc)
 108 {
 109         if(!timer_irq_inited) return;
 110
 111         if(sig == SIGALRM)
 112                 switch_timers(0);
 113
 114         CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
 115                          sig, &sc);
 116
 117         if(sig == SIGALRM)
 118                 switch_timers(1);
 119 }
 120
 121 void do_longjmp(void *b, int val)
 122 {
 123         jmp_buf *buf = b;
 124
 125         siglongjmp(*buf, val);
 126 }
 127
 128 /*
 129  * Overrides for Emacs so that we follow Linus's tabbing style.
 130  * Emacs will notice this stuff at the end of the file and automatically
 131  * adjust the settings for this buffer only.  This must remain at the end
 132  * of the file.
 133  * ---------------------------------------------------------------------------
 134  * Local variables:
 135  * c-file-style: "linux"
 136  * End:
 137  */