Fix issue with fixing tabs.

[mirror_edk2.git] / UnixPkg / Sec / X64 / SwitchStack.S

#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2008, 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 3 parameters EFI ABI\r
#   Convert UNIX to EFI ABI\r
#\r
# Arguments:\r
#\r
#   (rdi) EntryPoint    - Entry point with new stack.\r
#   (rsi) Context1      - Parameter1 for entry point. (rcx)\r
#   (rdx) Context2      - Parameter2 for entry point. (rdx) \r
#   (rcx) Context3      - Parameter3 for entry point. (r8)\r
#   (r8)  NewStack      - The pointer to new stack.\r
#\r
# Returns:\r
#\r
#   None\r
#\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(PeiSwitchStacks)\r
ASM_PFX(PeiSwitchStacks):\r
    pushq   %rbp            // stack frame is for the debugger\r
    movq    %rsp, %rbp\r
\r
    movq    %r8,  %rsp\r
    \r
    movq    %rdi, %rax\r
    movq    %rsi, %rcx\r
    movq    %rcx, %r8    \r
    \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
    subq    $32, %rsp  // 32-byte shadow space plus alignment pad\r
    call    *%rax\r
\r
\r
#------------------------------------------------------------------------------\r
# Routine Description:\r
#\r
#   Routine for switching stacks with 3 parameters UNIX ABI\r
#\r
# Arguments:\r
#\r
#   (rdi) EntryPoint    - Entry point with new stack.\r
#   (rsi) Context1      - Parameter1 for entry point.\r
#   (rdx) Context2      - Parameter2 for entry point.\r
#   (rcx) Context3      - Parameter3 for entry point.\r
#   (r8)  NewStack      - The pointer to new stack.\r
#\r
# Returns:\r
#\r
#   None\r
#\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(UnixPeiSwitchStacks)\r
ASM_PFX(UnixPeiSwitchStacks):\r
    pushq   %rbp            // stack frame is for the debugger\r
    movq    %rsp, %rbp\r
\r
    mov     %rdi, %rax\r
    mov     %rsi, %rdi\r
    mov     %rdx, %rsi\r
    mov     %rcx, %rdx\r
    mov     %r8,  %rsp\r
    \r
    \r
    #\r
    # Reserve space for redzone on the stack,\r
    # in case the callee wishes to spill them.\r
    #\r
    lea     -0x80(%rsp), %rsp\r
    call    *%rax\r
\r
\r
\r
#------------------------------------------------------------------------------\r
# VOID\r
# EFIAPI\r
# SecSwitchStack (\r
#   UINT32   TemporaryMemoryBase, // Rcx, Rdi\r
#   UINT32   PermenentMemoryBase  // Rdx, Rsi\r
#   );\r
#------------------------------------------------------------------------------    \r
ASM_GLOBAL ASM_PFX(SecSwitchStack)\r
ASM_PFX(SecSwitchStack):\r
  pushq   %rbp            // stack frame is for the debugger\r
  movq    %rsp, %rbp\r
\r
  mov     %rsp, %rax\r
  sub     %rdi, %rax\r
  add     %rsi, %rax\r
  mov    (%rip), %r10\r
  mov    %r10, (%rax) \r
  \r
  popq   %rbp\r
  ret\r
  \r