arch/um/kernel/skas/trap_user.c

   1 /*
   2  * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <signal.h>
   7 #include <errno.h>
   8 #include "signal_user.h"
   9 #include "user_util.h"
  10 #include "kern_util.h"
  11 #include "task.h"
  12 #include "sigcontext.h"
  13 #include "skas.h"
  14 #include "ptrace_user.h"
  15 #include "sysdep/ptrace.h"
  16 #include "sysdep/ptrace_user.h"
  17
  18 void sig_handler_common_skas(int sig, void *sc_ptr)
  19 {
  20         struct sigcontext *sc = sc_ptr;
  21         struct skas_regs *r;
  22         struct signal_info *info;
  23         int save_errno = errno;
  24         int save_user;
  25
  26         /* This is done because to allow SIGSEGV to be delivered inside a SEGV
  27          * handler.  This can happen in copy_user, and if SEGV is disabled,
  28          * the process will die.
  29          * XXX Figure out why this is better than SA_NODEFER
  30          */
  31         if(sig == SIGSEGV)
  32                 change_sig(SIGSEGV, 1);
  33
  34         r = &TASK_REGS(get_current())->skas;
  35         save_user = r->is_user;
  36         r->is_user = 0;
  37         if ( sig == SIGFPE || sig == SIGSEGV ||
  38              sig == SIGBUS || sig == SIGILL ||
  39              sig == SIGTRAP ) {
  40                 GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
  41         }
  42
  43         change_sig(SIGUSR1, 1);
  44         info = &sig_info[sig];
  45         if(!info->is_irq) unblock_signals();
  46
  47         (*info->handler)(sig, (union uml_pt_regs *) r);
  48
  49         errno = save_errno;
  50         r->is_user = save_user;
  51 }
  52
  53 extern int ptrace_faultinfo;
  54
  55 void user_signal(int sig, union uml_pt_regs *regs, int pid)
  56 {
  57         struct signal_info *info;
  58         int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
  59                     (sig == SIGILL) || (sig == SIGTRAP));
  60
  61         regs->skas.is_user = 1;
  62         if (segv)
  63                 get_skas_faultinfo(pid, &regs->skas.faultinfo);
  64         info = &sig_info[sig];
  65         (*info->handler)(sig, regs);
  66
  67         unblock_signals();
  68 }
  69
  70 /*
  71  * Overrides for Emacs so that we follow Linus's tabbing style.
  72  * Emacs will notice this stuff at the end of the file and automatically
  73  * adjust the settings for this buffer only.  This must remain at the end
  74  * of the file.
  75  * ---------------------------------------------------------------------------
  76  * Local variables:
  77  * c-file-style: "linux"
  78  * End:
  79  */