From 804405e7d10525e41720216137b2551f62a0663f Mon Sep 17 00:00:00 2001
From: eric_tian <eric_tian@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Mon, 30 Jun 2008 05:08:49 +0000
Subject: Port EdkUnixPkg to UnixPkg. The changes are listed as follows: 1.
 change *.msa to *.inf, and create platform configuration files .dec&.dsc&.fdf
 to comply with Edk2 build process 2. using PCD mechanism to replace macro. 3.
 change Sec code to cowork with PI1.0 Pei Core and produce temparory memory
 ppi.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5380 6f19259b-4bc3-4df7-8a09-765794883524
---
 UnixPkg/Sec/Stack.S | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 UnixPkg/Sec/Stack.S

(limited to 'UnixPkg/Sec/Stack.S')

diff --git a/UnixPkg/Sec/Stack.S b/UnixPkg/Sec/Stack.S
new file mode 100644
index 0000000000..50f07b0894
--- /dev/null
+++ b/UnixPkg/Sec/Stack.S
@@ -0,0 +1,92 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2008, Intel Corporation
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+# Module Name:
+#
+#   Stack.asm
+#
+# Abstract:
+#
+#   Switch the stack from temporary memory to permenent memory.
+#
+#------------------------------------------------------------------------------
+
+#------------------------------------------------------------------------------
+# VOID
+# EFIAPI
+# SecSwitchStack (
+#   UINT32   TemporaryMemoryBase,
+#   UINT32   PermenentMemoryBase
+#   );
+#------------------------------------------------------------------------------    
+
+#include <ProcessorBind.h>
+
+.globl ASM_PFX(SecSwitchStack)
+ASM_PFX(SecSwitchStack):
+#
+# Save three register: eax, ebx, ecx
+#    
+    push  %eax
+    push  %ebx
+    push  %ecx
+    push  %edx
+    
+#
+# !!CAUTION!! this function address's is pushed into stack after
+# migration of whole temporary memory, so need save it to permenent
+# memory at first!
+#    
+    
+    movl  20(%esp), %ebx            # Save the first parameter
+    movl  24(%esp), %ecx            # Save the second parameter
+    
+#
+# Save this function's return address into permenent memory at first.
+# Then, Fixup the esp point to permenent memory
+#
+
+    movl  %esp, %eax
+    subl  %ebx, %eax
+    addl  %ecx, %eax
+    movl  (%esp), %edx                 # copy pushed register's value to permenent memory
+    movl  %edx, (%eax)
+    movl  4(%esp), %edx
+    movl  %edx, 4(%eax)
+    movl  8(%esp), %edx
+    movl  %edx, 8(%eax)
+    movl  12(%esp), %edx
+    movl  %edx, 12(%eax)
+    movl  16(%esp), %edx
+    movl  %edx, 16(%eax)
+    movl  %eax, %esp                   # From now, esp is pointed to permenent memory
+
+#
+# Fixup the ebp point to permenent memory
+#
+    movl   %ebp, %eax
+    subl   %ebx, %eax
+    addl   %ecx, %eax
+    movl   %eax, %ebp                  # From now, ebp is pointed to permenent memory
+    
+#
+# Fixup callee's ebp point for PeiDispatch
+#    
+    movl   (%ebp), %eax
+    subl   %ebx, %eax
+    addl   %ecx, %eax
+    movl   %eax, (%ebp)                # From now, Temporary's PPI caller's stack is in permenent memory
+    
+    pop   %edx
+    pop   %ecx
+    pop   %ebx
+    pop   %eax
+    ret
-- 
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