1 files changed, 130 insertions, 0 deletions
diff --git a/nuttx/arch/x86/src/qemu/qemu_saveusercontext.S b/nuttx/arch/x86/src/qemu/qemu_saveusercontext.S
new file mode 100644
index 000000000..1d72bd643
--- /dev/null
+++ b/nuttx/arch/x86/src/qemu/qemu_saveusercontext.S
@@ -0,0 +1,130 @@
+/**************************************************************************
+ * arch/x86/src/qemu/up_saveusercontext.S
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+/**************************************************************************
+ * Conditional Compilation Options
+ **************************************************************************/
+
+/**************************************************************************
+ * Included Files
+ **************************************************************************/
+
+#include <nuttx/config.h>
+#include <arch/irq.h>
+#include "up_internal.h"
+
+/**************************************************************************
+ * Private Definitions
+ **************************************************************************/
+ 
+#ifdef __CYGWIN__
+# define SYMBOL(s) _##s
+#else
+# define SYMBOL(s) s
+#endif
+
+/**************************************************************************
+ * Private Types
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Function Prototypes
+ **************************************************************************/
+
+/**************************************************************************
+ * Global Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Functions
+ **************************************************************************/
+
+/**************************************************************************
+ * Public Functions
+ **************************************************************************/
+
+/**************************************************************************
+ * Name: up_saveusercontext
+ *
+ * Full C prototype:
+ *  int up_saveusercontext(uint32_t *regs);
+ *
+ **************************************************************************/
+
+#ifdef CONFIG_X86_NASM
+#  warning "No Nasm support"
+#else
+	.text
+	.globl	SYMBOL(up_saveusercontext)
+#ifndef __CYGWIN__
+	.type	SYMBOL(up_saveusercontext), @function
+#endif
+SYMBOL(up_saveusercontext):
+
+	/* %ebx, %esi, %edi, and %ebp must be preserved.
+	 * save %ebx, $esi, and %edi now... */
+
+	movl	4(%esp), %eax
+	movl	%ebx, (REG_EBX)(%eax)
+	movl	%esi, (REG_ESI)(%eax)
+	movl	%edi, (REG_EDI)(%eax)
+
+	/* Save the value of SP as will be after we return */
+
+	leal	4(%esp), %ecx
+	movl	%ecx, (REG_SP)(%eax)
+
+	/* Save the return PC */
+
+	movl	0(%esp), %ecx
+	movl	%ecx, (REG_PC)(%eax)
+
+	/* Save the framepointer */
+
+	movl %ebp, (REG_EBP)(%eax)
+
+	/* And return 0 */
+
+	xorl    %eax, %eax
+	ret
+#ifndef __CYGWIN__
+	.size	SYMBOL(up_saveusercontext), . - SYMBOL(up_saveusercontext)
+#endif
+    .end
+#endif