diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/X64/SwitchStack.nasm')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/X64/SwitchStack.nasm | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/SwitchStack.nasm b/Core/MdePkg/Library/BaseLib/X64/SwitchStack.nasm new file mode 100644 index 0000000000..b6fd7e0992 --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/X64/SwitchStack.nasm @@ -0,0 +1,51 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; 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.Asm
+;
+; Abstract:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; Routine Description:
+;
+; Routine for switching stacks with 2 parameters
+;
+; Arguments:
+;
+; (rcx) EntryPoint - Entry point with new stack.
+; (rdx) Context1 - Parameter1 for entry point.
+; (r8) Context2 - Parameter2 for entry point.
+; (r9) NewStack - The pointer to new stack.
+;
+; Returns:
+;
+; None
+;
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalSwitchStack)
+ASM_PFX(InternalSwitchStack):
+ mov rax, rcx
+ mov rcx, rdx
+ mov rdx, r8
+ ;
+ ; Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
+ ; in case the callee wishes to spill them.
+ ;
+ lea rsp, [r9 - 0x20]
+ call rax
+
|