Add source files for z180

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5426 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 192 insertions, 0 deletions

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 <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 <arch/irq.h>
+
+#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 */
+