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/****************************************************************************
* arch/arm/src/common/up_signal_dispatch.c
*
* Copyright (C) 2013 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_NUTTX_KERNEL) && defined(__KERNEL__) && !defined(CONFIG_DISABLE_SIGNALS)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_signal_dispatch
*
* Description:
* In this 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 a user-mode signalling handling stub will also execute
* before the ultimate signal handler is called. See
* arch/arm/src/armv[6\7]/up_signal_handler. This function is the
* user-space, signal handler trampoline function. It is called from
* up_signal_dispatch() in user-mode.
*
* Inputs:
* sighand - The address user-space signal handling function
* signo, info, and ucontext - Standard arguments to be passed to the
* signal handling function.
*
* Return:
* 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 */
(void)sys_call4(SYS_signal_handler, (uintptr_t)sighand, (uintptr_t)signo,
(uintptr_t)info, (uintptr_t)ucontext);
}
#endif /* CONFIG_NUTTX_KERNEL && __KERNEL__ && !CONFIG_DISABLE_SIGNALS */
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