EdkCompatibilityPkg/Compatibility/SmmBaseHelper/X64/PageFaultHandler.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006 - 2012, 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
  32     addq     $-0x68, %rsp                 # reserve memory to store XMM registers and make address 16-byte alignment
  33     movdqa   %xmm0, 0(%rsp)
  34     movdqa   %xmm1, 0x10(%rsp)
  35     movdqa   %xmm2, 0x20(%rsp)
  36     movdqa   %xmm3, 0x30(%rsp)
  37     movdqa   %xmm4, 0x40(%rsp)
  38     movdqa   %xmm5, 0x50(%rsp)
  39
  40     addq     $-0x20, %rsp
  41     call     ASM_PFX(PageFaultHandler)
  42     addq     $0x20, %rsp
  43
  44     movdqa   0(%rsp), %xmm0
  45     movdqa   0x10(%rsp), %xmm1
  46     movdqa   0x20(%rsp), %xmm2
  47     movdqa   0x30(%rsp), %xmm3
  48     movdqa   0x40(%rsp), %xmm4
  49     movdqa   0x50(%rsp), %xmm5
  50     addq     $0x68, %rsp
  51
  52     testb    %al, %al                     # set ZF flag
  53     popq     %r11
  54     popq     %r10
  55     popq     %r9
  56     popq     %r8
  57     popq     %rdx
  58     popq     %rcx
  59     popq     %rax                         # restore all volatile registers
  60     jnz      L1                           # check ZF flag
  61 #ifdef __APPLE__
  62     int      $3
  63 #else
  64     jmpq     *ASM_PFX(mOriginalHandler)
  65 #endif
  66 L1:
  67     addq     $0x08, %rsp                  # skip error code for PF
  68     iretq