2013-07-19 19:43:04 +02:00
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/****************************************************************************
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* arch/arm/src/armv7-a/arm_schedulesigaction.c
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*
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2016-02-14 02:11:09 +01:00
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* Copyright (C) 2013, 2015-2016 Gregory Nutt. All rights reserved.
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2013-07-19 19:43:04 +02:00
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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 <stdint.h>
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#include <sched.h>
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#include <debug.h>
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2016-02-14 02:11:09 +01:00
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#include <nuttx/irq.h>
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2013-07-19 19:43:04 +02:00
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#include <nuttx/arch.h>
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#include "arm.h"
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2014-08-09 01:53:55 +02:00
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#include "sched/sched.h"
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2013-07-19 19:43:04 +02:00
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#include "up_internal.h"
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#include "up_arch.h"
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#ifndef 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_schedule_sigaction
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*
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* Description:
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* This function is called by the OS when one or more
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* signal handling actions have been queued for execution.
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* The architecture specific code must configure things so
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2014-09-04 18:28:38 +02:00
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* that the 'sigdeliver' callback is executed on the thread
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2013-07-19 19:43:04 +02:00
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* specified by 'tcb' as soon as possible.
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*
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* This function may be called from interrupt handling logic.
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*
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* This operation should not cause the task to be unblocked
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* nor should it cause any immediate execution of sigdeliver.
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* Typically, a few cases need to be considered:
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*
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* (1) This function may be called from an interrupt handler
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* During interrupt processing, all xcptcontext structures
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* should be valid for all tasks. That structure should
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* be modified to invoke sigdeliver() either on return
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* from (this) interrupt or on some subsequent context
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* switch to the recipient task.
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* (2) If not in an interrupt handler and the tcb is NOT
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* the currently executing task, then again just modify
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* the saved xcptcontext structure for the recipient
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* task so it will invoke sigdeliver when that task is
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* later resumed.
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* (3) If not in an interrupt handler and the tcb IS the
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* currently executing task -- just call the signal
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* handler now.
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*
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****************************************************************************/
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void up_schedule_sigaction(struct tcb_s *tcb, sig_deliver_t sigdeliver)
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{
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2015-09-30 19:21:04 +02:00
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irqstate_t flags;
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2013-07-19 19:43:04 +02:00
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sdbg("tcb=0x%p sigdeliver=0x%p\n", tcb, sigdeliver);
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2015-09-30 19:21:04 +02:00
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/* Make sure that interrupts are disabled */
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2013-07-19 19:43:04 +02:00
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2016-02-14 02:11:09 +01:00
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flags = enter_critical_section();
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2013-07-19 19:43:04 +02:00
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2015-09-30 19:21:04 +02:00
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/* Refuse to handle nested signal actions */
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2013-07-19 19:43:04 +02:00
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2015-09-30 19:21:04 +02:00
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if (!tcb->xcp.sigdeliver)
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{
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2014-06-21 17:55:09 +02:00
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/* First, handle some special cases when the signal is being delivered
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* to the currently executing task.
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2013-07-19 19:43:04 +02:00
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*/
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2016-02-06 20:41:28 +01:00
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sdbg("rtcb=0x%p current_regs=0x%p\n", this_task(), current_regs);
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2013-07-19 19:43:04 +02:00
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2016-02-06 20:41:28 +01:00
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if (tcb == this_task())
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2013-07-19 19:43:04 +02:00
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{
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2014-06-21 17:55:09 +02:00
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/* CASE 1: We are not in an interrupt handler and a task is
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* signalling itself for some reason.
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2013-07-19 19:43:04 +02:00
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*/
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if (!current_regs)
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{
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/* In this case just deliver the signal now. */
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sigdeliver(tcb);
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}
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2014-06-21 17:55:09 +02:00
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/* CASE 2: We are in an interrupt handler AND the interrupted
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* task is the same as the one that must receive the signal, then
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* we will have to modify the return state as well as the state
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* in the TCB.
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2013-07-19 19:43:04 +02:00
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*
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2014-06-21 17:55:09 +02:00
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* Hmmm... there looks like a latent bug here: The following logic
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* would fail in the strange case where we are in an interrupt
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* handler, the thread is signalling itself, but a context switch
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* to another task has occurred so that current_regs does not
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2016-02-06 20:41:28 +01:00
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* refer to the thread of this_task()!
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2013-07-19 19:43:04 +02:00
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*/
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else
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{
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/* Save the return lr and cpsr and one scratch register
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* These will be restored by the signal trampoline after
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* the signals have been delivered.
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*/
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tcb->xcp.sigdeliver = sigdeliver;
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tcb->xcp.saved_pc = current_regs[REG_PC];
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tcb->xcp.saved_cpsr = current_regs[REG_CPSR];
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/* Then set up to vector to the trampoline with interrupts
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* disabled
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*/
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current_regs[REG_PC] = (uint32_t)up_sigdeliver;
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2014-06-21 17:55:09 +02:00
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current_regs[REG_CPSR] = (PSR_MODE_SVC | PSR_I_BIT | PSR_F_BIT);
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2013-07-19 19:43:04 +02:00
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2014-06-21 17:55:09 +02:00
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/* And make sure that the saved context in the TCB is the same
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* as the interrupt return context.
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2013-07-19 19:43:04 +02:00
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*/
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up_savestate(tcb->xcp.regs);
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}
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}
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2014-06-21 17:55:09 +02:00
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/* Otherwise, we are (1) signaling a task is not running from an
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* interrupt handler or (2) we are not in an interrupt handler and the
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* running task is signalling some non-running task.
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2013-07-19 19:43:04 +02:00
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*/
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else
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{
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2014-06-21 17:55:09 +02:00
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/* Save the return lr and cpsr and one scratch register. These
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* will be restored by the signal trampoline after the signals
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* have been delivered.
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2013-07-19 19:43:04 +02:00
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*/
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tcb->xcp.sigdeliver = sigdeliver;
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tcb->xcp.saved_pc = tcb->xcp.regs[REG_PC];
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tcb->xcp.saved_cpsr = tcb->xcp.regs[REG_CPSR];
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/* Then set up to vector to the trampoline with interrupts
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* disabled
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*/
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tcb->xcp.regs[REG_PC] = (uint32_t)up_sigdeliver;
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2014-06-21 17:55:09 +02:00
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tcb->xcp.regs[REG_CPSR] = (PSR_MODE_SVC | PSR_I_BIT | PSR_F_BIT);
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2013-07-19 19:43:04 +02:00
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}
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}
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2015-09-30 19:21:04 +02:00
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2016-02-14 02:11:09 +01:00
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leave_critical_section(flags);
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2013-07-19 19:43:04 +02:00
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}
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#endif /* !CONFIG_DISABLE_SIGNALS */
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