EdkCompatibilityPkg/Compatibility/SmmBaseHelper/X64/PageFaultHandler.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006 - 2010, 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 #   PageFaultHandler.S
  15 #
  16 # Abstract:
  17 #
  18 #   Defines page fault handler used to hook SMM IDT
  19 #
  20 #------------------------------------------------------------------------------
  21
  22 ASM_GLOBAL ASM_PFX(PageFaultHandlerHook)
  23 ASM_PFX(PageFaultHandlerHook):
  24     pushq    %rax                         # save all volatile registers
  25     pushq    %rcx
  26     pushq    %rdx
  27     pushq    %r8
  28     pushq    %r9
  29     pushq    %r10
  30     pushq    %r11
  31     addq     $-0x20, %rsp
  32     call     ASM_PFX(PageFaultHandler)
  33     addq     $0x20, %rsp
  34     test     %rax, %rax
  35     popq     %r11
  36     popq     %r10
  37     popq     %r9
  38     popq     %r8
  39     popq     %rdx
  40     popq     %rcx
  41     popq     %rax                         # restore all volatile registers
  42     jnz      L1
  43     jmpq     *ASM_PFX(mOriginalHandler)
  44 L1:
  45     addq     $0x08, %rsp                  # skip error code for PF
  46     iretq