1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
4; SPDX-License-Identifier: BSD-2-Clause-Patent
5;
6; Module Name:
7;
8;   SwitchStack.Asm
9;
10; Abstract:
11;
12;------------------------------------------------------------------------------
13
14    DEFAULT REL
15    SECTION .text
16
17;------------------------------------------------------------------------------
18; Routine Description:
19;
20;   Routine for switching stacks with 2 parameters
21;
22; Arguments:
23;
24;   (rcx) EntryPoint    - Entry point with new stack.
25;   (rdx) Context1      - Parameter1 for entry point.
26;   (r8)  Context2      - Parameter2 for entry point.
27;   (r9)  NewStack      - The pointer to new stack.
28;
29; Returns:
30;
31;   None
32;
33;------------------------------------------------------------------------------
34global ASM_PFX(InternalSwitchStack)
35ASM_PFX(InternalSwitchStack):
36    mov     rax, rcx
37    mov     rcx, rdx
38    mov     rdx, r8
39    ;
40    ; Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
41    ; in case the callee wishes to spill them.
42    ;
43    lea     rsp, [r9 - 0x20]
44    call    rax
45
46