1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
4; This program and the accompanying materials
5; are licensed and made available under the terms and conditions of the BSD License
6; which accompanies this distribution.  The full text of the license may be found at
7; http://opensource.org/licenses/bsd-license.php.
8;
9; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11;
12; Module Name:
13;
14;   SwitchStack.Asm
15;
16; Abstract:
17;
18;------------------------------------------------------------------------------
19
20    DEFAULT REL
21    SECTION .text
22
23;------------------------------------------------------------------------------
24; Routine Description:
25;
26;   Routine for switching stacks with 2 parameters
27;
28; Arguments:
29;
30;   (rcx) EntryPoint    - Entry point with new stack.
31;   (rdx) Context1      - Parameter1 for entry point.
32;   (r8)  Context2      - Parameter2 for entry point.
33;   (r9)  NewStack      - The pointer to new stack.
34;
35; Returns:
36;
37;   None
38;
39;------------------------------------------------------------------------------
40global ASM_PFX(InternalSwitchStack)
41ASM_PFX(InternalSwitchStack):
42    mov     rax, rcx
43    mov     rcx, rdx
44    mov     rdx, r8
45    ;
46    ; Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
47    ; in case the callee wishes to spill them.
48    ;
49    lea     rsp, [r9 - 0x20]
50    call    rax
51
52