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trap.c

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#if 0
#include "kern_util.h"
#include "skas.h"
#include "ptrace_user.h"
#include "sysdep/ptrace_user.h"
#endif

#include <errno.h>
#include <signal.h>
#include "sysdep/ptrace.h"
#include "kern_constants.h"
#include "as-layout.h"
#include "os.h"
#include "sigcontext.h"
#include "task.h"

static struct uml_pt_regs ksig_regs[UM_NR_CPUS];

void sig_handler_common_skas(int sig, void *sc_ptr)
{
      struct sigcontext *sc = sc_ptr;
      struct uml_pt_regs *r;
      void (*handler)(int, struct uml_pt_regs *);
      int save_user, save_errno = errno;

      /*
       * This is done because to allow SIGSEGV to be delivered inside a SEGV
       * handler.  This can happen in copy_user, and if SEGV is disabled,
       * the process will die.
       * XXX Figure out why this is better than SA_NODEFER
       */
      if (sig == SIGSEGV) {
            change_sig(SIGSEGV, 1);
            /*
             * For segfaults, we want the data from the
             * sigcontext.  In this case, we don't want to mangle
             * the process registers, so use a static set of
             * registers.  For other signals, the process
             * registers are OK.
             */
            r = &ksig_regs[cpu()];
            copy_sc(r, sc_ptr);
      }
      else r = TASK_REGS(get_current());

      save_user = r->is_user;
      r->is_user = 0;
      if ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
          (sig == SIGILL) || (sig == SIGTRAP))
            GET_FAULTINFO_FROM_SC(r->faultinfo, sc);

      change_sig(SIGUSR1, 1);

      handler = sig_info[sig];

      /* unblock SIGVTALRM, SIGIO if sig isn't IRQ signal */
      if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
            unblock_signals();

      handler(sig, r);

      errno = save_errno;
      r->is_user = save_user;
}

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