arch/um/kernel/tt/trap_user.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdlib.h>
   7 #include <errno.h>
   8 #include <signal.h>
   9 #include "sysdep/ptrace.h"
  10 #include "signal_user.h"
  11 #include "user_util.h"
  12 #include "kern_util.h"
  13 #include "task.h"
  14 #include "tt.h"
  15
  16 void sig_handler_common_tt(int sig, void *sc_ptr)
  17 {
  18         struct sigcontext *sc = sc_ptr;
  19         struct tt_regs save_regs, *r;
  20         struct signal_info *info;
  21         int save_errno = errno, is_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          */
  27         if(sig == SIGSEGV)
  28                 change_sig(SIGSEGV, 1);
  29
  30         r = &TASK_REGS(get_current())->tt;
  31         save_regs = *r;
  32         is_user = user_context(SC_SP(sc));
  33         r->sc = sc;
  34         if(sig != SIGUSR2)
  35                 r->syscall = -1;
  36
  37         info = &sig_info[sig];
  38         if(!info->is_irq) unblock_signals();
  39
  40         (*info->handler)(sig, (union uml_pt_regs *) r);
  41
  42         if(is_user){
  43                 interrupt_end();
  44                 block_signals();
  45                 set_user_mode(NULL);
  46         }
  47         *r = save_regs;
  48         errno = save_errno;
  49 }
  50
  51 /*
  52  * Overrides for Emacs so that we follow Linus's tabbing style.
  53  * Emacs will notice this stuff at the end of the file and automatically
  54  * adjust the settings for this buffer only.  This must remain at the end
  55  * of the file.
  56  * ---------------------------------------------------------------------------
  57  * Local variables:
  58  * c-file-style: "linux"
  59  * End:
  60  */