From 57cbb33b4853e6a5cc4b035eecc6c691c48eaa7e Mon Sep 17 00:00:00 2001 From: patacongo Date: Mon, 10 Dec 2012 18:40:01 +0000 Subject: Add source files for z180 git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5426 42af7a65-404d-4744-a932-0658087f49c3 --- nuttx/arch/z80/src/z180/z180_schedulesigaction.c | 192 +++++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 nuttx/arch/z80/src/z180/z180_schedulesigaction.c (limited to 'nuttx/arch/z80/src/z180/z180_schedulesigaction.c') diff --git a/nuttx/arch/z80/src/z180/z180_schedulesigaction.c b/nuttx/arch/z80/src/z180/z180_schedulesigaction.c new file mode 100644 index 000000000..3d9bbe55b --- /dev/null +++ b/nuttx/arch/z80/src/z180/z180_schedulesigaction.c @@ -0,0 +1,192 @@ +/**************************************************************************** + * arch/z80/src/z180/z180_schedulesigaction.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 + +#include +#include +#include + +#include +#include + +#include "chip/switch.h" +#include "os_internal.h" +#include "up_internal.h" + +#ifndef CONFIG_DISABLE_SIGNALS + +/**************************************************************************** + * Private Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: z180_sigsetup + ****************************************************************************/ + +static void z180_sigsetup(FAR _TCB *tcb, sig_deliver_t sigdeliver, FAR chipreg_t *regs) +{ + /* Save the return address and interrupt state. These will be restored by + * the signal trampoline after the signals have been delivered. + */ + + tcb->xcp.sigdeliver = sigdeliver; + tcb->xcp.saved_pc = regs[XCPT_PC]; + tcb->xcp.saved_i = regs[XCPT_I]; + + /* Then set up to vector to the trampoline with interrupts disabled */ + + regs[XCPT_PC] = (chipreg_t)up_sigdeliver; + regs[XCPT_I] = 0; +} + +/**************************************************************************** + * 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(FAR _TCB *tcb, sig_deliver_t sigdeliver) +{ + dbg("tcb=0x%p sigdeliver=0x%04x\n", tcb, (uint16_t)sigdeliver); + + /* Refuse to handle nested signal actions */ + + if (tcb->xcp.sigdeliver == NULL) + { + 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. + */ + + if (tcb == (FAR _TCB*)g_readytorun.head) + { + /* CASE 1: We are not in an interrupt handler and a task is + * signalling itself for some reason. + */ + + if (!IN_INTERRUPT()) + { + /* 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. + */ + + else + { + /* Set up to vector to the trampoline with interrupts disabled. */ + + z180_sigsetup(tcb, sigdeliver, IRQ_STATE()); + + /* And make sure that the saved context in the TCB + * is the same as the interrupt return context. + */ + + SAVE_IRQCONTEXT(tcb); + } + } + + /* 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 + { + /* Set up to vector to the trampoline with interrupts disabled. */ + + z180_sigsetup(tcb, sigdeliver, tcb->xcp.regs); + } + + irqrestore(flags); + } +} + +#endif /* CONFIG_DISABLE_SIGNALS */ + -- cgit v1.2.3