diff options
Diffstat (limited to 'nuttx/arch/arm/src/armv7-m/up_schedulesigaction.c')
| -rw-r--r-- | nuttx/arch/arm/src/armv7-m/up_schedulesigaction.c | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/nuttx/arch/arm/src/armv7-m/up_schedulesigaction.c b/nuttx/arch/arm/src/armv7-m/up_schedulesigaction.c deleted file mode 100644 index 9221a69a2..000000000 --- a/nuttx/arch/arm/src/armv7-m/up_schedulesigaction.c +++ /dev/null @@ -1,224 +0,0 @@ -/**************************************************************************** - * arch/arm/src/armv7-m/up_schedulesigaction.c - * - * Copyright (C) 2009-2013 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 <stdint.h> -#include <sched.h> -#include <debug.h> - -#include <nuttx/arch.h> - -#include "psr.h" -#include "os_internal.h" -#include "up_internal.h" -#include "up_arch.h" - -#ifndef CONFIG_DISABLE_SIGNALS - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: up_schedule_sigaction - * - * Description: - * This function is called by the OS when one or more - * signal handling actions have been queued for execution. - * The architecture specific code must configure things so - * that the 'igdeliver' callback is executed on the thread - * specified by 'tcb' as soon as possible. - * - * This function may be called from interrupt handling logic. - * - * This operation should not cause the task to be unblocked - * nor should it cause any immediate execution of sigdeliver. - * Typically, a few cases need to be considered: - * - * (1) This function may be called from an interrupt handler - * During interrupt processing, all xcptcontext structures - * should be valid for all tasks. That structure should - * be modified to invoke sigdeliver() either on return - * from (this) interrupt or on some subsequent context - * switch to the recipient task. - * (2) If not in an interrupt handler and the tcb is NOT - * the currently executing task, then again just modify - * the saved xcptcontext structure for the recipient - * task so it will invoke sigdeliver when that task is - * later resumed. - * (3) If not in an interrupt handler and the tcb IS the - * currently executing task -- just call the signal - * handler now. - * - ****************************************************************************/ - -void up_schedule_sigaction(_TCB *tcb, sig_deliver_t sigdeliver) -{ - /* Refuse to handle nested signal actions */ - - sdbg("tcb=0x%p sigdeliver=0x%p\n", tcb, sigdeliver); - - if (!tcb->xcp.sigdeliver) - { - irqstate_t flags; - - /* Make sure that interrupts are disabled */ - - flags = irqsave(); - - /* First, handle some special cases when the signal is - * being delivered to the currently executing task. - */ - - sdbg("rtcb=0x%p current_regs=0x%p\n", g_readytorun.head, current_regs); - - if (tcb == (_TCB*)g_readytorun.head) - { - /* CASE 1: We are not in an interrupt handler and - * a task is signalling itself for some reason. - */ - - if (!current_regs) - { - /* In this case just deliver the signal now. */ - - sigdeliver(tcb); - } - - /* CASE 2: We are in an interrupt handler AND the - * interrupted task is the same as the one that - * must receive the signal, then we will have to modify - * the return state as well as the state in the TCB. - * - * Hmmm... there looks like a latent bug here: The following - * logic would fail in the strange case where we are in an - * interrupt handler, the thread is signalling itself, but - * a context switch to another task has occurred so that - * current_regs does not refer to the thread at g_readytorun.head! - */ - - else - { - /* Save the return lr and cpsr and one scratch register - * These will be restored by the signal trampoline after - * the signals have been delivered. - */ - - tcb->xcp.sigdeliver = sigdeliver; - tcb->xcp.saved_pc = current_regs[REG_PC]; -#ifdef CONFIG_ARMV7M_USEBASEPRI - tcb->xcp.saved_basepri = current_regs[REG_BASEPRI]; -#else - tcb->xcp.saved_primask = current_regs[REG_PRIMASK]; -#endif - tcb->xcp.saved_xpsr = current_regs[REG_XPSR]; - - /* Then set up to vector to the trampoline with interrupts - * disabled - */ - - current_regs[REG_PC] = (uint32_t)up_sigdeliver; -#ifdef CONFIG_ARMV7M_USEBASEPRI - current_regs[REG_BASEPRI] = NVIC_SYSH_DISABLE_PRIORITY; -#else - current_regs[REG_PRIMASK] = 1; -#endif - current_regs[REG_XPSR] = ARMV7M_XPSR_T; - - /* And make sure that the saved context in the TCB - * is the same as the interrupt return context. - */ - - up_savestate(tcb->xcp.regs); - } - } - - /* Otherwise, we are (1) signaling a task is not running - * from an interrupt handler or (2) we are not in an - * interrupt handler and the running task is signalling - * some non-running task. - */ - - else - { - /* Save the return lr and cpsr and one scratch register - * These will be restored by the signal trampoline after - * the signals have been delivered. - */ - - tcb->xcp.sigdeliver = sigdeliver; - tcb->xcp.saved_pc = tcb->xcp.regs[REG_PC]; -#ifdef CONFIG_ARMV7M_USEBASEPRI - tcb->xcp.saved_basepri = tcb->xcp.regs[REG_BASEPRI]; -#else - tcb->xcp.saved_primask = tcb->xcp.regs[REG_PRIMASK]; -#endif - tcb->xcp.saved_xpsr = tcb->xcp.regs[REG_XPSR]; - - /* Then set up to vector to the trampoline with interrupts - * disabled - */ - - tcb->xcp.regs[REG_PC] = (uint32_t)up_sigdeliver; -#ifdef CONFIG_ARMV7M_USEBASEPRI - tcb->xcp.regs[REG_BASEPRI] = NVIC_SYSH_DISABLE_PRIORITY; -#else - tcb->xcp.regs[REG_PRIMASK] = 1; -#endif - tcb->xcp.regs[REG_XPSR] = ARMV7M_XPSR_T; - } - - irqrestore(flags); - } -} - -#endif /* !CONFIG_DISABLE_SIGNALS */ |