118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/************************************************************
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* up_sigdeliver.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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 <sys/types.h>
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#include <sched.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include "os_internal.h"
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#include "up_internal.h"
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#include "c5471.h"
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/************************************************************
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* 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 Funtions
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************************************************************/
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/************************************************************
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* Name: up_sigdeliver
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*
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* Description:
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* This is the a signal handling trampoline. When a
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* signal action was posted. The task context was mucked
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* with and forced to branch to this location with interrupts
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* disabled.
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*
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************************************************************/
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void up_sigdeliver(void)
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{
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_TCB *rtcb = (_TCB*)g_readytorun.head;
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uint32 regs[XCPTCONTEST_REGS];
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sig_deliver_t sigdeliver;
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ASSERT(rtcb->xcp.sigdeliver);
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/* Save the real return state on the stack. */
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up_copystate(regs, rtcb->xcp.regs);
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regs[REG_PC] = rtcb->xcp.saved_pc;
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regs[REG_CPSR] = rtcb->xcp.saved_cpsr;
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/* Get a local copy of the sigdeliver function pointer.
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* we do this so that we can nullify the sigdeliver
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* function point in the TCB and accept more signal
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* deliveries while processing the current pending
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* signals.
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*/
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sigdeliver = rtcb->xcp.sigdeliver;
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rtcb->xcp.sigdeliver = NULL;
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/* Then enable interrupts. We should still be safe from
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* any further signal handling actions until we also
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* nullify tcb->xcp.sigdeliver.
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*/
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irqrestore(SVC_MODE | F_BIT);
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/* Deliver the signals */
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sigdeliver(rtcb);
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/* Then restore the correct state for this thread of
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* execution.
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*/
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up_fullcontextrestore(regs);
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}
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