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/****************************************************************************
* arch/z80/src/ez80/ez80_sigdeliver.c
*
* Copyright (C) 2008-2010 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 <sched.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <arch/board/board.h>
#include "chip/switch.h"
#include "sched/sched.h"
#include "up_internal.h"
#ifndef CONFIG_DISABLE_SIGNALS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_sigdeliver
*
* Description:
* This is the a signal handling trampoline. When a signal action was
* posted. The task context was mucked with and forced to branch to this
* location with interrupts disabled.
*
****************************************************************************/
void up_sigdeliver(void)
{
#ifndef CONFIG_DISABLE_SIGNALS
FAR struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
chipreg_t regs[XCPTCONTEXT_REGS];
sig_deliver_t sigdeliver;
/* Save the errno. This must be preserved throughout the signal handling
* so that the user code final gets the correct errno value (probably
* EINTR).
*/
int saved_errno = rtcb->pterrno;
board_led_on(LED_SIGNAL);
sdbg("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
rtcb, rtcb->xcp.sigdeliver, rtcb->sigpendactionq.head);
ASSERT(rtcb->xcp.sigdeliver != NULL);
/* Save the real return state on the stack. */
ez80_copystate(regs, rtcb->xcp.regs);
regs[XCPT_PC] = rtcb->xcp.saved_pc;
regs[XCPT_I] = rtcb->xcp.saved_i;
/* Get a local copy of the sigdeliver function pointer. We do this so
* that we can nullify the sigdeliver function pointer in the TCB and
* accept more signal deliveries while processing the current pending
* signals.
*/
sigdeliver = rtcb->xcp.sigdeliver;
rtcb->xcp.sigdeliver = NULL;
/* Then restore the task interrupt state. */
irqrestore(regs[XCPT_I]);
/* Deliver the signals */
sigdeliver(rtcb);
/* Output any debug messages BEFORE restoring errno (because they may
* alter errno), then disable interrupts again and restore the original
* errno that is needed by the user logic (it is probably EINTR).
*/
sdbg("Resuming\n");
(void)irqsave();
rtcb->pterrno = saved_errno;
/* Then restore the correct state for this thread of
* execution.
*/
board_led_off(LED_SIGNAL);
ez80_restorecontext(regs);
#endif
}
#endif /* CONFIG_DISABLE_SIGNALS */
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