4188b87703
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@738 42af7a65-404d-4744-a932-0658087f49c3
142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
/****************************************************************************
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* arch/z80/src/ez80/ez80_sigdeliver.c
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*
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* Copyright (C) 2008 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 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 <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 "chip/switch.h"
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#include "os_internal.h"
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#include "up_internal.h"
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#ifndef CONFIG_DISABLE_SIGNALS
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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 Functions
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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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#ifndef CONFIG_DISABLE_SIGNALS
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FAR _TCB *rtcb = (_TCB*)g_readytorun.head;
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chipret_t regs[XCPTCONTEXT_REGS];
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sig_deliver_t sigdeliver;
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/* Save the errno. This must be preserved throughout the signal handling
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* so that the the user code final gets the correct errno value (probably
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* EINTR).
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*/
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int saved_errno = rtcb->pterrno;
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up_ledon(LED_SIGNAL);
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dbg("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
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rtcb, rtcb->xcp.sigdeliver, rtcb->sigpendactionq.head);
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ASSERT(rtcb->xcp.sigdeliver != NULL);
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/* Save the real return state on the stack. */
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z80_copystate(regs, rtcb->xcp.regs);
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regs[XCPT_PC] = rtcb->xcp.saved_pc;
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regs[XCPT_I] = rtcb->xcp.saved_i;
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/* Get a local copy of the sigdeliver function pointer. We do this so
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* that we can nullify the sigdeliver function point in the TCB and accept
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* more signal deliveries while processing the current pending 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 restore the task interrupt state. */
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irqrestore(regs[XCPT_I]);
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/* Deliver the signals */
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sigdeliver(rtcb);
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/* Output any debug messaged BEFORE restoring errno (because they may alter
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* errno), then restore the original errno that is needed by the user logic
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* (it is probably EINTR).
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*/
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dbg("Resuming\n");
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rtcb->pterrno = saved_errno;
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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_ledoff(LED_SIGNAL);
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z80_restoreusercontext(regs);
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#endif
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}
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#endif /* CONFIG_DISABLE_SIGNALS */
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