MdePkg: Clean up source files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / SwitchStack.S

diff --git a/MdePkg/Library/BaseLib/X64/SwitchStack.S b/MdePkg/Library/BaseLib/X64/SwitchStack.S
index 85cdb4306dd5c2f1fbd854f1a0d1fe5c090b8a65..5ce2612a7b4d98b55cfa90f214c2efeabdc83fd2 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/SwitchStack.S
+++ b/MdePkg/Library/BaseLib/X64/SwitchStack.S
@@ -1,44 +1,52 @@
-#------------------------------------------------------------------------------
-#
-# Copyright (c) 2006, 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:
-#
-#   SwitchStack.S
-#
-# Abstract:
-#
-#------------------------------------------------------------------------------
-
-
-#------------------------------------------------------------------------------
-# Routine Description:
-#
-#   Routine for switching stacks with 1 parameter
-#
-# Arguments:
-#
-#   (rdi) EntryPoint    - Entry point with new stack.
-#   (rsi) Context1      - Parameter1 for entry point.
-#   (rdx)  Context2     - Parameter2 for entry point.
-#   (rcx)  NewStack     - Pointer to new stack.
-#
-# Returns:
-#
-#   None
-#
-#------------------------------------------------------------------------------
-.global _InternalSwitchStack;
-_InternalSwitchStack:
-    mov     %rcx, %rax
-    mov     %rdx, %rcx
-    mov     %r8, %rdx
-    lea     -0x20(%r9), %rsp
-    call    *%rax
+#------------------------------------------------------------------------------\r
+#\r
+# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+# This program and the accompanying materials\r
+# are licensed and made available under the terms and conditions of the BSD License\r
+# which accompanies this distribution.  The full text of the license may be found at\r
+# http://opensource.org/licenses/bsd-license.php.\r
+#\r
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+#\r
+# Module Name:\r
+#\r
+#   SwitchStack.S\r
+#\r
+# Abstract:\r
+#\r
+#------------------------------------------------------------------------------\r
+\r
+\r
+#------------------------------------------------------------------------------\r
+# Routine Description:\r
+#\r
+#   Routine for switching stacks with 2 parameters\r
+#\r
+# Arguments:\r
+#\r
+#   (rcx) EntryPoint    - Entry point with new stack.\r
+#   (rdx) Context1      - Parameter1 for entry point.\r
+#   (r8)  Context2      - Parameter2 for entry point.\r
+#   (r9)  NewStack      - The pointer to new stack.\r
+#\r
+# Returns:\r
+#\r
+#   None\r
+#\r
+#------------------------------------------------------------------------------\r
+ASM_GLOBAL ASM_PFX(InternalSwitchStack)\r
+ASM_PFX(InternalSwitchStack):\r
+    pushq   %rbp\r
+    movq    %rsp, %rbp\r
+\r
+    mov     %rcx, %rax  // Shift registers for new call\r
+    mov     %rdx, %rcx\r
+    mov     %r8, %rdx\r
+    #\r
+    # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,\r
+    # in case the callee wishes to spill them.\r
+    #\r
+    lea     -0x20(%r9), %rsp\r
+    pushq   $0        // stop gdb stack unwind\r
+    jmp     *%rax     // call EntryPoint ()\r