120 lines
5.0 KiB
C
120 lines
5.0 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-r/arm_signal_dispatch.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include "svcall.h"
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#include "pgalloc.h"
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#include "up_internal.h"
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#if ((defined(CONFIG_BUILD_PROTECTED) && defined(__KERNEL__)) || \
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defined(CONFIG_BUILD_PROTECTED)) && !defined(CONFIG_DISABLE_SIGNALS)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_signal_dispatch
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*
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* Description:
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* In the protected mode build, this function will be called to execute a
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* a signal handler in user-space. When the signal is delivered, a
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* kernel-mode stub will first run to perform some housekeeping functions.
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* This kernel-mode stub will then be called transfer control to the user
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* mode signal handler by calling this function.
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*
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* Normally the a user-mode signalling handling stub will also execute
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* before the ultimate signal handler is called. See
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* arch/arm/src/armv[6\7]/up_signal_handler. This function is the
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* user-space, signal handler trampoline function. It is called from
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* up_signal_dispatch() in user-mode.
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*
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* Inputs:
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* sighand - The address user-space signal handling function
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* signo, info, and ucontext - Standard arguments to be passed to the
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* signal handling function.
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*
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* Return:
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* None. This function does not return in the normal sense. It returns
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* via an architecture specific system call made by up_signal_handler().
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* However, this will look like a normal return by the caller of
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* up_signal_dispatch.
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*
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****************************************************************************/
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void up_signal_dispatch(_sa_sigaction_t sighand, int signo,
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FAR siginfo_t *info, FAR void *ucontext)
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{
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/* We are signalling a user group, but does the signal handler lie in the
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* user address space? Or the kernel address space? The OS does
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* intercept some signals for its own purpose (such as the death-of-child
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* signal.
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*/
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if (arm_uservaddr((uintptr_t)sighand))
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{
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/* Yes.. Let sys_call4() do all of the work to get us into user space */
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(void)sys_call4(SYS_signal_handler, (uintptr_t)sighand, (uintptr_t)signo,
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(uintptr_t)info, (uintptr_t)ucontext);
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}
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else
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{
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/* No.. we are already in kernel mode so just call the handler */
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sighand(signo, info, ucontext);
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}
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}
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#endif /* (CONFIG_BUILD_PROTECTED || CONFIG_BUILD_PROTECTED) && !CONFIG_DISABLE_SIGNALS */
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