MdePkg: Clean up source files

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / InternalSwitchStack.S

#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
# Portions copyright (c) 2011, Apple Inc. 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
#   InternalSwitchStack.S\r
#\r
# Abstract:\r
#\r
#   Implementation of a stack switch on IA-32.\r
#\r
#------------------------------------------------------------------------------\r
\r
ASM_GLOBAL ASM_PFX(InternalSwitchStack)\r
\r
#------------------------------------------------------------------------------\r
# VOID\r
# EFIAPI\r
# InternalSwitchStack (\r
#   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
#   IN      VOID                      *Context1,   OPTIONAL\r
#   IN      VOID                      *Context2,   OPTIONAL\r
#   IN      VOID                      *NewStack\r
#   );\r
#------------------------------------------------------------------------------\r
ASM_PFX(InternalSwitchStack):\r
  pushl %ebp\r
  movl  %esp, %ebp\r
\r
  movl  20(%ebp), %esp      # switch stack\r
  subl  $8, %esp\r
\r
  movl  16(%ebp), %eax\r
  movl  %eax, 4(%esp)\r
  movl  12(%ebp), %eax\r
  movl  %eax, (%esp)\r
  pushl $0                  # keeps gdb from unwinding stack\r
  jmp   *8(%ebp)            # call and never return\r
\r