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      1 ## @file
      2 #   This is the assembly code for page fault handler hook.
      3 #
      4 # Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
      5 #
      6 # This program and the accompanying materials are
      7 # licensed and made available under the terms and conditions of the BSD License
      8 # which accompanies this distribution.  The full text of the license may be found at
      9 # http://opensource.org/licenses/bsd-license.php
     10 #
     11 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
     12 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     13 #
     14 ##
     15 
     16 ASM_GLOBAL ASM_PFX(PageFaultHandlerHook)
     17 ASM_PFX(PageFaultHandlerHook):
     18     addq     $-0x10, %rsp
     19     # save rax
     20     movq     %rax, 0x08(%rsp)
     21 
     22     # pushq    %rax                         # save all volatile registers
     23     pushq    %rcx
     24     pushq    %rdx
     25     pushq    %r8
     26     pushq    %r9
     27     pushq    %r10
     28     pushq    %r11
     29     # save volatile fp registers
     30     # 68h + 08h(for alignment)
     31     addq     $-0x70, %rsp
     32     stmxcsr  0x60(%rsp)
     33     movdqa   %xmm0, 0x0(%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     # load volatile fp registers
     45     ldmxcsr  0x60(%rsp)
     46     movdqa   0x0(%rsp), %xmm0
     47     movdqa   0x10(%rsp), %xmm1
     48     movdqa   0x20(%rsp), %xmm2
     49     movdqa   0x30(%rsp), %xmm3
     50     movdqa   0x40(%rsp), %xmm4
     51     movdqa   0x50(%rsp), %xmm5
     52     addq     $0x70, %rsp
     53 
     54     popq     %r11
     55     popq     %r10
     56     popq     %r9
     57     popq     %r8
     58     popq     %rdx
     59     popq     %rcx
     60     # popq     %rax                         # restore all volatile registers
     61 
     62     addq     $0x10, %rsp
     63 
     64     # rax returned from PageFaultHandler is NULL or OriginalHandler address
     65     # NULL if the page fault is handled by PageFaultHandler
     66     # OriginalHandler address if the page fault is not handled by PageFaultHandler
     67     testq    %rax, %rax
     68 
     69     # save OriginalHandler address
     70     movq     %rax, -0x10(%rsp)
     71     # restore rax
     72     movq     -0x08(%rsp), %rax
     73 
     74     jz       L1
     75 
     76     # jump to OriginalHandler
     77     jmpq     *-0x10(%rsp)
     78 
     79 L1:
     80     addq     $0x08, %rsp                  # skip error code for PF
     81     iretq
     82