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 "sysdep/ptrace.h"
   9 #include "signal_user.h"
  10 #include "user_util.h"
  11 #include "kern_util.h"
  12 #include "task.h"
  13 #include "sigcontext.h"
  14
  15 void sig_handler_common_skas(int sig, void *sc_ptr)
  16 {
  17         struct sigcontext *sc = sc_ptr;
  18         struct skas_regs *r;
  19         struct signal_info *info;
  20         int save_errno = errno;
  21         int save_user;
  22
  23         /* This is done because to allow SIGSEGV to be delivered inside a SEGV
  24          * handler.  This can happen in copy_user, and if SEGV is disabled,
  25          * the process will die.
  26          * XXX Figure out why this is better than SA_NODEFER
  27          */
  28         if(sig == SIGSEGV)
  29                 change_sig(SIGSEGV, 1);
  30
  31         r = &TASK_REGS(get_current())->skas;
  32         save_user = r->is_user;
  33         r->is_user = 0;
  34         r->fault_addr = SC_FAULT_ADDR(sc);
  35         r->fault_type = SC_FAULT_TYPE(sc);
  36         r->trap_type = SC_TRAP_TYPE(sc);
  37
  38         change_sig(SIGUSR1, 1);
  39         info = &sig_info[sig];
  40         if(!info->is_irq) unblock_signals();
  41
  42         (*info->handler)(sig, (union uml_pt_regs *) r);
  43
  44         errno = save_errno;
  45         r->is_user = save_user;
  46 }
  47
  48 void user_signal(int sig, union uml_pt_regs *regs)
  49 {
  50         struct signal_info *info;
  51
  52         regs->skas.is_user = 1;
  53         regs->skas.fault_addr = 0;
  54         regs->skas.fault_type = 0;
  55         regs->skas.trap_type = 0;
  56         info = &sig_info[sig];
  57         (*info->handler)(sig, regs);
  58
  59         unblock_signals();
  60 }
  61
  62 /*
  63  * Overrides for Emacs so that we follow Linus's tabbing style.
  64  * Emacs will notice this stuff at the end of the file and automatically
  65  * adjust the settings for this buffer only.  This must remain at the end
  66  * of the file.
  67  * ---------------------------------------------------------------------------
  68  * Local variables:
  69  * c-file-style: "linux"
  70  * End:
  71  */