MdePkg/Library/BaseLib/X64/SwitchStack.nasm

   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 ;------------------------------------------------------------------------------
  34 global ASM_PFX(InternalSwitchStack)
  35 ASM_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