1 files changed, 153 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/armv6-m/up_initialstate.c b/nuttx/arch/arm/src/armv6-m/up_initialstate.c
new file mode 100644
index 000000000..6b2c98e67
--- /dev/null
+++ b/nuttx/arch/arm/src/armv6-m/up_initialstate.c
@@ -0,0 +1,153 @@
+/****************************************************************************
+ * arch/arm/src/armv6-m/up_initialstate.c
+ *
+ *   Copyright (C) 2009, 2011-2013 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 <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <nuttx/arch.h>
+
+#include "up_internal.h"
+#include "up_arch.h"
+
+#include "psr.h"
+#include "exc_return.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_initial_state
+ *
+ * Description:
+ *   A new thread is being started and a new TCB
+ *   has been created. This function is called to initialize
+ *   the processor specific portions of the new TCB.
+ *
+ *   This function must setup the intial architecture registers
+ *   and/or  stack so that execution will begin at tcb->start
+ *   on the next context switch.
+ *
+ ****************************************************************************/
+
+void up_initial_state(struct tcb_s *tcb)
+{
+  struct xcptcontext *xcp = &tcb->xcp;
+
+  /* Initialize the initial exception register context structure */
+
+  memset(xcp, 0, sizeof(struct xcptcontext));
+
+  /* Save the initial stack pointer */
+
+  xcp->regs[REG_SP]      = (uint32_t)tcb->adj_stack_ptr;
+
+  /* Save the task entry point (stripping off the thumb bit) */
+
+  xcp->regs[REG_PC]      = (uint32_t)tcb->start & ~1;
+  
+  /* Specify thumb mode */
+
+  xcp->regs[REG_XPSR]    = ARMV6M_XPSR_T;
+
+  /* If this task is running PIC, then set the PIC base register to the
+   * address of the allocated D-Space region.
+   */
+
+#ifdef CONFIG_PIC
+  if (tcb->dspace != NULL)
+    {
+      /* Set the PIC base register (probably R10) to the address of the
+       * alloacated D-Space region.
+       */
+
+      xcp->regs[REG_PIC] = (uint32_t)tcb->dspace->region;
+    }
+
+  /* Make certain that bit 0 is set in the main entry address.  This
+   * is only an issue when NXFLAT is enabled.  NXFLAT doesn't know
+   * anything about thumb; the addresses that NXFLAT sets are based
+   * on file header info and won't have bit 0 set.
+   */
+
+#ifdef CONFIG_NXFLAT
+  tcb->entry.main = (main_t)((uint32_t)tcb->entry.main | 1);
+#endif
+#endif /* CONFIG_PIC */
+
+  /* Set privileged- or unprivileged-mode, depending on how NuttX is
+   * configured and what kind of thread is being started.
+   *
+   * If the kernel build is not selected, then all threads run in
+   * privileged thread mode.
+   */
+
+  xcp->regs[REG_EXC_RETURN] = EXC_RETURN_BASE | EXC_RETURN_THREAD_MODE;
+  xcp->regs[REG_EXC_RETURN] |= EXC_RETURN_STD_CONTEXT;
+
+#ifdef CONFIG_NUTTX_KERNEL
+  if ((tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
+    {
+      /* It is a normal task or a pthread.  Set user mode */
+
+      xcp->regs[REG_EXC_RETURN] = EXC_RETURN_PROCESS_STACK;
+    }
+#endif /* CONFIG_NUTTX_KERNEL */
+
+  /* Enable or disable interrupts, based on user configuration */
+
+#ifdef CONFIG_SUPPRESS_INTERRUPTS
+  xcp->regs[REG_BASEPRI] = NVIC_SYSH_DISABLE_PRIORITY;
+#endif /* CONFIG_SUPPRESS_INTERRUPTS */
+}