text: /****************************************************************************
   * arch/arm/src/armv7-m/up_signal_dispatch.c
   *
   *   Copyright (C) 2013-2014 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  #include <nuttx/arch.h>
  
  #include "svcall.h"
  #include "up_internal.h"
  
  #if (defined(CONFIG_BUILD_PROTECTED) && defined(__KERNEL__)) || \
       defined(CONFIG_BUILD_KERNEL)
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: up_signal_dispatch
   *
   * Description:
   *   In the kernel mode build, this function will be called to execute a
   *   a signal handler in user-space.  When the signal is delivered, a
   *   kernel-mode stub will first run to perform some housekeeping functions.
   *   This kernel-mode stub will then be called transfer control to the user
   *   mode signal handler by calling this function.
   *
   *   Normally the user-mode signaling handling stub will also execute
   *   before the ultimate signal handler is called.  See
   *   arch/arm/src/armv7-m/gnu/up_signal_handler.S.  This function is the
   *   user-space, signal handler trampoline function.  It is called from
   *   up_signal_dispatch() in user-mode.
   *
   * Input Parameters:
   *   sighand - The address user-space signal handling function
   *   signo, info, and ucontext - Standard arguments to be passed to the
   *     signal handling function.
   *
   * Returned Value:
   *   None.  This function does not return in the normal sense.  It returns
   *   via an architecture specific system call made by up_signal_handler().
   *   However, this will look like a normal return by the caller of
   *   up_signal_dispatch.
   *
   ****************************************************************************/
  
  void up_signal_dispatch(_sa_sigaction_t sighand, int signo,
                          FAR siginfo_t *info, FAR void *ucontext)
  {
    /* Let sys_call4() do all of the work */
  
    sys_call4(SYS_signal_handler, (uintptr_t)sighand, (uintptr_t)signo,
              (uintptr_t)info, (uintptr_t)ucontext);
  }
  
  #endif /* (CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL) && !CONFIG_DISABLE_PTHREAD */
  