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>
diff --git a/MdeModulePkg/Universal/CapsulePei/CapsuleX64.inf b/MdeModulePkg/Universal/CapsulePei/CapsuleX64.inf
index 1630dfc..8318eaa 100644
--- a/MdeModulePkg/Universal/CapsulePei/CapsuleX64.inf
+++ b/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
diff --git a/MdeModulePkg/Universal/CapsulePei/X64/PageFaultHandler.nasm b/MdeModulePkg/Universal/CapsulePei/X64/PageFaultHandler.nasm
new file mode 100644
index 0000000..91ace09
--- /dev/null
+++ b/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
+
