Rework of kernel build signal dispatch to user-space handlers

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5778 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 115 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/armv6-m/up_signal_handler.S b/nuttx/arch/arm/src/armv6-m/up_signal_handler.S
new file mode 100644
index 000000000..559b8c6d7
--- /dev/null
+++ b/nuttx/arch/arm/src/armv6-m/up_signal_handler.S
@@ -0,0 +1,115 @@
+/****************************************************************************
+ * arch/arm/srcm/armv6-m/up_signal_handler.S
+ *
+ *   Copyright (C) 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 <arch/syscall.h>
+
+#if defined(CONFIG_NUTTX_KERNEL) && !defined(__KERNEL__)
+
+/****************************************************************************
+ * File info
+ ****************************************************************************/
+
+	.cpu	cortex-m0
+	.file	"up_signal_handler.S"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_signal_handler
+ *
+ * Description:
+ *   This function is the user-space, signal handler trampoline function.  It
+ *   is called from up_signal_dispatch() in user-mode.
+ *
+ * Inputs:
+ *   R0 = sighand
+ *     The address user-space signal handling function
+ *   R1-R3 = signo, info, and ucontext
+ *     Standard arguments to be passed to the signal handling function.
+ *
+ * Return:
+ *   None.  This function does not return in the normal sense.  It returns
+ *   via the SYS_signal_handler_return (see svcall.h)
+ *
+ ****************************************************************************/
+
+	.text
+	.align	2
+	.code	16
+	.thumb_func
+	.globl	up_signal_handler
+	.type	up_signal_handler, function
+up_signal_handler:
+
+	/* Save some register */
+
+	push	{r4, r5			/* Save R4 and R5 on the stack */
+	mov		r5, lr			/* Save LR in R5 */
+
+	/* Call the signal handler */
+
+	mov		r4, r0			/* R4=sighand */
+	mov		r0, r1			/* R0=signo */
+	mov		r1, r2			/* R1=info */
+	mov		r2, r3			/* R2=ucontext */
+	blx		r4				/* Call the signal handler */
+
+	/* Restore the registers */
+
+	mov		lr, r5			/* Restore LR */
+	pop		{r4, r5}		/* Restore R4 and R5 */
+
+	/* Execute the SYS_signal_handler_return SVCall (will not return) */
+
+	mov		r0, #SYS_signal_handler_return
+	svc		0
+	nop
+
+	.size	up_signal_handler, .-up_signal_handler
+	.end
+
+#endif /* CONFIG_NUTTX_KERNEL && !__KERNEL__ */