Rename assembly file.

[bertos.git] / bertos / emul / switch_i386.S

diff --git a/bertos/emul/switch_i386.S b/bertos/emul/switch_i386.S
new file mode 100644 (file)
index 0000000..6931d45
--- /dev/null
+++ b/bertos/emul/switch_i386.S
@@ -0,0 +1,44 @@
+/*!
+ * \file
+ * <!--
+ * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 1999,2000,2001 Bernardo Innocenti <bernie@develer.com>
+ * This file is part of DevLib - See devlib/README for information.
+ * -->
+ *
+ * \brief i386 context switch
+ *
+ * \version $Id$
+ *
+ * \author Bernardo Innocenti <bernie@develer.com>
+ */
+
+/* void asm_switch_context(void ** new_sp, void ** save_sp) */
+.globl asm_switch_context
+asm_switch_context:
+       pushl   %eax
+       pushl   %ebx
+       pushl   %ecx
+       pushl   %edx
+       pushl   %esi
+       pushl   %edi
+       pushl   %ebp
+       movl    0x24(%esp),%ebp         /* ebp = save_sp */
+       movl    %esp,(%ebp)             /* *save_sp = esp */
+       movl    0x20(%esp),%ebp         /* ebp = new_sp */
+       movl    (%ebp),%esp             /* esp = *new_sp */
+       popl    %ebp
+       popl    %edi
+       popl    %esi
+       popl    %edx
+       popl    %ecx
+       popl    %ebx
+       popl    %eax
+       ret
+
+/* int asm_switch_version(void) */
+.globl asm_switch_version
+asm_switch_version:
+       mov     $1,%eax
+       ret
+