MdeModulePkg CapsulePei: Convert X64/PageFaultHandler.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/PageFaultHandler.asm to X64/PageFaultHandler.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

MdeModulePkg/Universal/CapsulePei/CapsuleX64.inf

@@ -38,6 +38,7 @@
 
 [Sources]
   X64/X64Entry.c
+  X64/PageFaultHandler.nasm
   X64/PageFaultHandler.asm
   X64/PageFaultHandler.S
   Common/CapsuleCoalesce.c

MdeModulePkg/Universal/CapsulePei/X64/PageFaultHandler.nasm

@@ -0,0 +1,87 @@
+;; @file
+;   This is the assembly code for page fault handler hook.
+;
+; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+;
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;;
+
+extern ASM_PFX(PageFaultHandler)
+
+    DEFAULT REL
+    SECTION .text
+
+global ASM_PFX(PageFaultHandlerHook)
+ASM_PFX(PageFaultHandlerHook):
+    add     rsp, -0x10
+    ; save rax
+    mov     [rsp + 0x8], rax
+
+    ;push    rax                         ; save all volatile registers
+    push    rcx
+    push    rdx
+    push    r8
+    push    r9
+    push    r10
+    push    r11
+    ; save volatile fp registers
+    ; 68h + 08h(for alignment)
+    add     rsp, -0x70
+    stmxcsr [rsp + 0x60]
+    movdqa  [rsp + 0x0], xmm0
+    movdqa  [rsp + 0x10], xmm1
+    movdqa  [rsp + 0x20], xmm2
+    movdqa  [rsp + 0x30], xmm3
+    movdqa  [rsp + 0x40], xmm4
+    movdqa  [rsp + 0x50], xmm5
+
+    add     rsp, -0x20
+    call    ASM_PFX(PageFaultHandler)
+    add     rsp, 0x20
+
+    ; load volatile fp registers
+    ldmxcsr [rsp + 0x60]
+    movdqa  xmm0,  [rsp + 0x0]
+    movdqa  xmm1,  [rsp + 0x10]
+    movdqa  xmm2,  [rsp + 0x20]
+    movdqa  xmm3,  [rsp + 0x30]
+    movdqa  xmm4,  [rsp + 0x40]
+    movdqa  xmm5,  [rsp + 0x50]
+    add     rsp, 0x70
+
+    pop     r11
+    pop     r10
+    pop     r9
+    pop     r8
+    pop     rdx
+    pop     rcx
+    ;pop     rax                         ; restore all volatile registers
+
+    add     rsp, 0x10
+
+    ; rax returned from PageFaultHandler is NULL or OriginalHandler address
+    ; NULL if the page fault is handled by PageFaultHandler
+    ; OriginalHandler address if the page fault is not handled by PageFaultHandler
+    test    rax, rax
+
+    ; save OriginalHandler address
+    mov     [rsp - 0x10], rax
+    ; restore rax
+    mov     rax, [rsp - 0x8]
+
+    jz      .0
+
+    ; jump to OriginalHandler
+    jmp     qword [rsp - 0x10]
+
+.0:
+    add     rsp, 0x8                    ; skip error code for PF
+    iretq
+