MdePkg BaseMemoryLibRepStr: Convert Ia32/CopyMem.asm to NASM
The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
Ia32/CopyMem.asm to Ia32/CopyMem.nasm
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf b/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
index 64b0595..d7e60ff 100644
--- a/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
+++ b/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
@@ -66,6 +66,7 @@
Ia32/SetMem16.S
Ia32/SetMem.nasm
Ia32/SetMem.S
+ Ia32/CopyMem.nasm
Ia32/CopyMem.S
Ia32/ScanMem64.nasm
Ia32/ScanMem64.asm
@@ -87,6 +88,7 @@
Ia32/SetMem16.asm
Ia32/SetMem.nasm
Ia32/SetMem.asm
+ Ia32/CopyMem.nasm
Ia32/CopyMem.asm
[Sources.X64]
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.nasm
new file mode 100644
index 0000000..491bdf2
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.nasm
@@ -0,0 +1,64 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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.
+;
+; Module Name:
+;
+; CopyMem.Asm
+;
+; Abstract:
+;
+; CopyMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; InternalMemCopyMem (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+ push esi
+ push edi
+ mov esi, [esp + 16] ; esi <- Source
+ mov edi, [esp + 12] ; edi <- Destination
+ mov edx, [esp + 20] ; edx <- Count
+ lea eax, [esi + edx - 1] ; eax <- End of Source
+ cmp esi, edi
+ jae .0
+ cmp eax, edi
+ jae @CopyBackward ; Copy backward if overlapped
+.0:
+ mov ecx, edx
+ and edx, 3
+ shr ecx, 2
+ rep movsd ; Copy as many Dwords as possible
+ jmp @CopyBytes
+@CopyBackward:
+ mov esi, eax ; esi <- End of Source
+ lea edi, [edi + edx - 1] ; edi <- End of Destination
+ std
+@CopyBytes:
+ mov ecx, edx
+ rep movsb ; Copy bytes backward
+ cld
+ mov eax, [esp + 12] ; eax <- Destination as return value
+ pop edi
+ pop esi
+ ret
+
