diff --git a/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm b/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm
index 544e3c3892..ef11458077 100644
--- a/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/EnablePaging64.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -44,16 +44,12 @@ ASM_PFX(InternalX86EnablePaging64):
mov cr0, eax ; enable paging
retf ; topmost 2 dwords hold the address
.0:
- DB 0x67, 0x48 ; 32-bit address size, 64-bit operand size
- mov ebx, [esp] ; mov rbx, [esp]
- DB 0x67, 0x48
- mov ecx, [esp + 8] ; mov rcx, [esp + 8]
- DB 0x67, 0x48
- mov edx, [esp + 0x10] ; mov rdx, [esp + 10h]
- DB 0x67, 0x48
- mov esp, [esp + 0x18] ; mov rsp, [esp + 18h]
- DB 0x48
- add esp, -0x20 ; add rsp, -20h
- call ebx ; call rbx
+BITS 64
+ mov rbx, [esp]
+ mov rcx, [esp + 8]
+ mov rdx, [esp + 0x10]
+ mov rsp, [esp + 0x18]
+ add rsp, -0x20
+ call rbx
hlt ; no one should get here
diff --git a/MdePkg/Library/BaseLib/Ia32/LongJump.nasm b/MdePkg/Library/BaseLib/Ia32/LongJump.nasm
index f94d10f806..6c13dfe307 100644
--- a/MdePkg/Library/BaseLib/Ia32/LongJump.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/LongJump.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -39,12 +39,12 @@ ASM_PFX(InternalLongJump):
mov edx, [esp + 4] ; edx = JumpBuffer
mov edx, [edx + 24] ; edx = target SSP
- READSSP_EAX
+ rdsspd eax
sub edx, eax ; edx = delta
mov eax, edx ; eax = delta
shr eax, 2 ; eax = delta/sizeof(UINT32)
- INCSSP_EAX
+ incsspd eax
CetDone:
diff --git a/MdePkg/Library/BaseLib/Ia32/Monitor.nasm b/MdePkg/Library/BaseLib/Ia32/Monitor.nasm
index 28dc0ba70a..70dbe66e27 100644
--- a/MdePkg/Library/BaseLib/Ia32/Monitor.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/Monitor.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,6 +31,6 @@ ASM_PFX(AsmMonitor):
mov eax, [esp + 4]
mov ecx, [esp + 8]
mov edx, [esp + 12]
- DB 0xf, 1, 0xc8 ; monitor
+ monitor
ret
diff --git a/MdePkg/Library/BaseLib/Ia32/Mwait.nasm b/MdePkg/Library/BaseLib/Ia32/Mwait.nasm
index 3956940cab..2d36a97df6 100644
--- a/MdePkg/Library/BaseLib/Ia32/Mwait.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/Mwait.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -29,6 +29,6 @@ global ASM_PFX(AsmMwait)
ASM_PFX(AsmMwait):
mov eax, [esp + 4]
mov ecx, [esp + 8]
- DB 0xf, 1, 0xc9 ; mwait
+ mwait
ret
diff --git a/MdePkg/Library/BaseLib/Ia32/RdRand.nasm b/MdePkg/Library/BaseLib/Ia32/RdRand.nasm
index e12b8e9611..d818b6ef55 100644
--- a/MdePkg/Library/BaseLib/Ia32/RdRand.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/RdRand.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.
+; Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -25,9 +25,8 @@ SECTION .text
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86RdRand16)
ASM_PFX(InternalX86RdRand16):
- ; rdrand ax ; generate a 16 bit RN into ax
+ rdrand eax ; generate a 16 bit RN into ax
; CF=1 if RN generated ok, otherwise CF=0
- db 0xf, 0xc7, 0xf0 ; rdrand r16: "0f c7 /6 ModRM:r/m(w)"
jc rn16_ok ; jmp if CF=1
xor eax, eax ; reg=0 if CF=0
ret ; return with failure status
@@ -45,9 +44,8 @@ rn16_ok:
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86RdRand32)
ASM_PFX(InternalX86RdRand32):
- ; rdrand eax ; generate a 32 bit RN into eax
+ rdrand eax ; generate a 32 bit RN into eax
; CF=1 if RN generated ok, otherwise CF=0
- db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"
jc rn32_ok ; jmp if CF=1
xor eax, eax ; reg=0 if CF=0
ret ; return with failure status
@@ -65,14 +63,13 @@ rn32_ok:
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86RdRand64)
ASM_PFX(InternalX86RdRand64):
- ; rdrand eax ; generate a 32 bit RN into eax
+ rdrand eax ; generate a 32 bit RN into eax
; CF=1 if RN generated ok, otherwise CF=0
- db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"
jnc rn64_ret ; jmp if CF=0
mov edx, dword [esp + 4]
mov [edx], eax
- db 0xf, 0xc7, 0xf0 ; generate another 32 bit RN
+ rdrand eax ; generate another 32 bit RN
jnc rn64_ret ; jmp if CF=0
mov [edx + 4], eax
diff --git a/MdePkg/Library/BaseLib/Ia32/ReadDr4.nasm b/MdePkg/Library/BaseLib/Ia32/ReadDr4.nasm
index 81c681de34..1c312b670d 100644
--- a/MdePkg/Library/BaseLib/Ia32/ReadDr4.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/ReadDr4.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,8 +31,8 @@ ASM_PFX(AsmReadDr4):
; this register will cause a #UD exception.
;
; MS assembler doesn't support this instruction since no one would use it
- ; under normal circustances. Here opcode is used.
+ ; under normal circustances.
;
- DB 0xf, 0x21, 0xe0
+ mov eax, dr4
ret
diff --git a/MdePkg/Library/BaseLib/Ia32/ReadDr5.nasm b/MdePkg/Library/BaseLib/Ia32/ReadDr5.nasm
index e2deacb832..07a1b44a00 100644
--- a/MdePkg/Library/BaseLib/Ia32/ReadDr5.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/ReadDr5.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,8 +31,8 @@ ASM_PFX(AsmReadDr5):
; this register will cause a #UD exception.
;
; MS assembler doesn't support this instruction since no one would use it
- ; under normal circustances. Here opcode is used.
+ ; under normal circustances.
;
- DB 0xf, 0x21, 0xe8
+ mov eax, dr5
ret
diff --git a/MdePkg/Library/BaseLib/Ia32/SetJump.nasm b/MdePkg/Library/BaseLib/Ia32/SetJump.nasm
index 364613b5f9..2577373241 100644
--- a/MdePkg/Library/BaseLib/Ia32/SetJump.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/SetJump.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -46,8 +46,8 @@ ASM_PFX(SetJump):
jnc CetDone
mov eax, 1
- INCSSP_EAX ; to read original SSP
- READSSP_EAX
+ incsspd eax ; to read original SSP
+ rdsspd eax
mov [edx + 0x24], eax ; save SSP
CetDone:
diff --git a/MdePkg/Library/BaseLib/Ia32/WriteDr4.nasm b/MdePkg/Library/BaseLib/Ia32/WriteDr4.nasm
index 0d23fca111..b8479b39f7 100644
--- a/MdePkg/Library/BaseLib/Ia32/WriteDr4.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/WriteDr4.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -32,8 +32,8 @@ ASM_PFX(AsmWriteDr4):
; this register will cause a #UD exception.
;
; MS assembler doesn't support this instruction since no one would use it
- ; under normal circustances. Here opcode is used.
+ ; under normal circustances.
;
- DB 0xf, 0x23, 0xe0
+ mov dr4, eax
ret
diff --git a/MdePkg/Library/BaseLib/Ia32/WriteDr5.nasm b/MdePkg/Library/BaseLib/Ia32/WriteDr5.nasm
index bc5f424b8d..3545561025 100644
--- a/MdePkg/Library/BaseLib/Ia32/WriteDr5.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/WriteDr5.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -32,8 +32,8 @@ ASM_PFX(AsmWriteDr5):
; this register will cause a #UD exception.
;
; MS assembler doesn't support this instruction since no one would use it
- ; under normal circustances. Here opcode is used.
+ ; under normal circustances.
;
- DB 0xf, 0x23, 0xe8
+ mov dr5, eax
ret
diff --git a/MdePkg/Library/BaseLib/X64/DisablePaging64.nasm b/MdePkg/Library/BaseLib/X64/DisablePaging64.nasm
index c76ed1a76c..200c408d9a 100644
--- a/MdePkg/Library/BaseLib/X64/DisablePaging64.nasm
+++ b/MdePkg/Library/BaseLib/X64/DisablePaging64.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -51,8 +51,7 @@ ASM_PFX(InternalX86DisablePaging64):
sub eax, 4 ; eax <- One slot below transition code on the stack
push rcx ; push Cs to stack
push r10 ; push address of tansition code on stack
- DB 0x48 ; prefix to composite "retq" with next "retf"
- retf ; Use far return to load CS register from stack
+ retfq
; Start of transition code
.0:
diff --git a/MdePkg/Library/BaseLib/X64/LongJump.nasm b/MdePkg/Library/BaseLib/X64/LongJump.nasm
index 59f7092169..2002f65cba 100644
--- a/MdePkg/Library/BaseLib/X64/LongJump.nasm
+++ b/MdePkg/Library/BaseLib/X64/LongJump.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -41,12 +41,12 @@ ASM_PFX(InternalLongJump):
push rdx ; save rdx
mov rdx, [rcx + 0xF8] ; rdx = target SSP
- READSSP_RAX
+ rdsspq rax
sub rdx, rax ; rdx = delta
mov rax, rdx ; rax = delta
shr rax, 3 ; rax = delta/sizeof(UINT64)
- INCSSP_RAX
+ incsspq rax
pop rdx ; restore rdx
CetDone:
diff --git a/MdePkg/Library/BaseLib/X64/Monitor.nasm b/MdePkg/Library/BaseLib/X64/Monitor.nasm
index e1ccb83a85..210037d402 100644
--- a/MdePkg/Library/BaseLib/X64/Monitor.nasm
+++ b/MdePkg/Library/BaseLib/X64/Monitor.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -32,6 +32,6 @@ ASM_PFX(AsmMonitor):
mov eax, ecx
mov ecx, edx
mov edx, r8d
- DB 0xf, 1, 0xc8 ; monitor
+ monitor
ret
diff --git a/MdePkg/Library/BaseLib/X64/Mwait.nasm b/MdePkg/Library/BaseLib/X64/Mwait.nasm
index 83fc895491..c8ad59588b 100644
--- a/MdePkg/Library/BaseLib/X64/Mwait.nasm
+++ b/MdePkg/Library/BaseLib/X64/Mwait.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -30,6 +30,6 @@ global ASM_PFX(AsmMwait)
ASM_PFX(AsmMwait):
mov eax, ecx
mov ecx, edx
- DB 0xf, 1, 0xc9 ; mwait
+ mwait
ret
diff --git a/MdePkg/Library/BaseLib/X64/RdRand.nasm b/MdePkg/Library/BaseLib/X64/RdRand.nasm
index 7e7fe99670..73479be8d3 100644
--- a/MdePkg/Library/BaseLib/X64/RdRand.nasm
+++ b/MdePkg/Library/BaseLib/X64/RdRand.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.
+; Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -26,9 +26,8 @@
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86RdRand16)
ASM_PFX(InternalX86RdRand16):
- ; rdrand ax ; generate a 16 bit RN into eax,
+ rdrand eax ; generate a 16 bit RN into eax,
; CF=1 if RN generated ok, otherwise CF=0
- db 0xf, 0xc7, 0xf0 ; rdrand r16: "0f c7 /6 ModRM:r/m(w)"
jc rn16_ok ; jmp if CF=1
xor rax, rax ; reg=0 if CF=0
ret ; return with failure status
@@ -45,9 +44,8 @@ rn16_ok:
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86RdRand32)
ASM_PFX(InternalX86RdRand32):
- ; rdrand eax ; generate a 32 bit RN into eax,
+ rdrand eax ; generate a 32 bit RN into eax,
; CF=1 if RN generated ok, otherwise CF=0
- db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"
jc rn32_ok ; jmp if CF=1
xor rax, rax ; reg=0 if CF=0
ret ; return with failure status
@@ -64,9 +62,8 @@ rn32_ok:
;------------------------------------------------------------------------------
global ASM_PFX(InternalX86RdRand64)
ASM_PFX(InternalX86RdRand64):
- ; rdrand rax ; generate a 64 bit RN into rax,
+ rdrand rax ; generate a 64 bit RN into rax,
; CF=1 if RN generated ok, otherwise CF=0
- db 0x48, 0xf, 0xc7, 0xf0 ; rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"
jc rn64_ok ; jmp if CF=1
xor rax, rax ; reg=0 if CF=0
ret ; return with failure status
diff --git a/MdePkg/Library/BaseLib/X64/ReadDr4.nasm b/MdePkg/Library/BaseLib/X64/ReadDr4.nasm
index 82c0a9a588..90b2172cee 100644
--- a/MdePkg/Library/BaseLib/X64/ReadDr4.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadDr4.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,6 +31,6 @@ ASM_PFX(AsmReadDr4):
; There's no obvious reason to access this register, since it's aliased to
; DR7 when DE=0 or an exception generated when DE=1
;
- DB 0xf, 0x21, 0xe0
+ mov rax, dr4
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadDr5.nasm b/MdePkg/Library/BaseLib/X64/ReadDr5.nasm
index c309c66dfe..c1143f4498 100644
--- a/MdePkg/Library/BaseLib/X64/ReadDr5.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadDr5.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,6 +31,6 @@ ASM_PFX(AsmReadDr5):
; There's no obvious reason to access this register, since it's aliased to
; DR7 when DE=0 or an exception generated when DE=1
;
- DB 0xf, 0x21, 0xe8
+ mov rax, dr5
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm0.nasm b/MdePkg/Library/BaseLib/X64/ReadMm0.nasm
index 615721b6aa..e64b2c7882 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm0.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm0.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm0)
ASM_PFX(AsmReadMm0):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xc0
+ movq rax, mm0
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm1.nasm b/MdePkg/Library/BaseLib/X64/ReadMm1.nasm
index 7b27393490..bec3c71207 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm1.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm1.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm1)
ASM_PFX(AsmReadMm1):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xc8
+ movq rax, mm1
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm2.nasm b/MdePkg/Library/BaseLib/X64/ReadMm2.nasm
index c654b91a7a..4c880697cb 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm2.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm2.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm2)
ASM_PFX(AsmReadMm2):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xd0
+ movq rax, mm2
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm3.nasm b/MdePkg/Library/BaseLib/X64/ReadMm3.nasm
index 88d51c0781..cf81e5a7ab 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm3.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm3.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm3)
ASM_PFX(AsmReadMm3):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xd8
+ movq rax, mm3
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm4.nasm b/MdePkg/Library/BaseLib/X64/ReadMm4.nasm
index 4252d20bb1..17ba364e32 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm4.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm4.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm4)
ASM_PFX(AsmReadMm4):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xe0
+ movq rax, mm4
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm5.nasm b/MdePkg/Library/BaseLib/X64/ReadMm5.nasm
index d8f530dec8..f1354dd68c 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm5.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm5.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm5)
ASM_PFX(AsmReadMm5):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xe8
+ movq rax, mm5
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm6.nasm b/MdePkg/Library/BaseLib/X64/ReadMm6.nasm
index 6f6883c2b6..9d5a287218 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm6.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm6.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm6)
ASM_PFX(AsmReadMm6):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xf0
+ movq rax, mm6
ret
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm7.nasm b/MdePkg/Library/BaseLib/X64/ReadMm7.nasm
index 573f15dfc8..ae15f24d8b 100644
--- a/MdePkg/Library/BaseLib/X64/ReadMm7.nasm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm7.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmReadMm7)
ASM_PFX(AsmReadMm7):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x7e, 0xf8
+ movq rax, mm7
ret
diff --git a/MdePkg/Library/BaseLib/X64/SetJump.nasm b/MdePkg/Library/BaseLib/X64/SetJump.nasm
index 5a68396eec..5943a5ebe5 100644
--- a/MdePkg/Library/BaseLib/X64/SetJump.nasm
+++ b/MdePkg/Library/BaseLib/X64/SetJump.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -48,8 +48,8 @@ ASM_PFX(SetJump):
jnc CetDone
mov rax, 1
- INCSSP_RAX ; to read original SSP
- READSSP_RAX
+ incsspq rax ; to read original SSP
+ rdsspq rax
mov [rcx + 0xF8], rax ; save SSP
CetDone:
diff --git a/MdePkg/Library/BaseLib/X64/WriteDr4.nasm b/MdePkg/Library/BaseLib/X64/WriteDr4.nasm
index c4b12c9e92..5e4d96015e 100644
--- a/MdePkg/Library/BaseLib/X64/WriteDr4.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteDr4.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,7 +31,7 @@ ASM_PFX(AsmWriteDr4):
; There's no obvious reason to access this register, since it's aliased to
; DR6 when DE=0 or an exception generated when DE=1
;
- DB 0xf, 0x23, 0xe1
+ mov dr4, rcx
mov rax, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteDr5.nasm b/MdePkg/Library/BaseLib/X64/WriteDr5.nasm
index 986a4a95d9..d5d4e2f324 100644
--- a/MdePkg/Library/BaseLib/X64/WriteDr5.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteDr5.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,7 +31,7 @@ ASM_PFX(AsmWriteDr5):
; There's no obvious reason to access this register, since it's aliased to
; DR7 when DE=0 or an exception generated when DE=1
;
- DB 0xf, 0x23, 0xe9
+ mov dr5, rcx
mov rax, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm0.nasm b/MdePkg/Library/BaseLib/X64/WriteMm0.nasm
index 3f03529edf..e6b5a0fc33 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm0.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm0.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm0)
ASM_PFX(AsmWriteMm0):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xc1
+ movq mm0, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm1.nasm b/MdePkg/Library/BaseLib/X64/WriteMm1.nasm
index f552d40716..414c6af6da 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm1.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm1.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm1)
ASM_PFX(AsmWriteMm1):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xc9
+ movq mm1, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm2.nasm b/MdePkg/Library/BaseLib/X64/WriteMm2.nasm
index 1bd176ced9..525740342a 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm2.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm2.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm2)
ASM_PFX(AsmWriteMm2):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xd1
+ movq mm2, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm3.nasm b/MdePkg/Library/BaseLib/X64/WriteMm3.nasm
index 403f140736..abf11bfb17 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm3.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm3.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm3)
ASM_PFX(AsmWriteMm3):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xd9
+ movq mm3, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm4.nasm b/MdePkg/Library/BaseLib/X64/WriteMm4.nasm
index d99709d495..7cbd25e70a 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm4.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm4.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm4)
ASM_PFX(AsmWriteMm4):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xe1
+ movq mm4, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm5.nasm b/MdePkg/Library/BaseLib/X64/WriteMm5.nasm
index 0467ac4220..9edfd0db83 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm5.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm5.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm5)
ASM_PFX(AsmWriteMm5):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xe9
+ movq mm5, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm6.nasm b/MdePkg/Library/BaseLib/X64/WriteMm6.nasm
index 6d2e5eb8fb..4555563a55 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm6.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm6.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm6)
ASM_PFX(AsmWriteMm6):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xf1
+ movq mm6, rcx
ret
diff --git a/MdePkg/Library/BaseLib/X64/WriteMm7.nasm b/MdePkg/Library/BaseLib/X64/WriteMm7.nasm
index de72adf685..4ef0eb5271 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm7.nasm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm7.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -27,9 +27,6 @@
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteMm7)
ASM_PFX(AsmWriteMm7):
- ;
- ; 64-bit MASM doesn't support MMX instructions, so use opcode here
- ;
- DB 0x48, 0xf, 0x6e, 0xf9
+ movq mm7, rcx
ret
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm
index 5769c00bf9..3b336c6bdf 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -44,15 +44,15 @@ ASM_PFX(InternalMemCopyMem):
and r8, 7
shr rcx, 3 ; rcx <- # of Qwords to copy
jz @CopyBytes
- DB 0x49, 0xf, 0x7e, 0xc2 ; movd r10, mm0 (Save mm0 in r10)
+ movq r10, mm0
.1:
- DB 0xf, 0x6f, 0x6 ; movd mm0, [rsi]
- DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
+ movq mm0, [rsi]
+ movntq [rdi], mm0
add rsi, 8
add rdi, 8
loop .1
mfence
- DB 0x49, 0xf, 0x6e, 0xc2 ; movd mm0, r10 (Restore mm0)
+ movq mm0, r10
jmp @CopyBytes
@CopyBackward:
mov rsi, r9 ; rsi <- End of Source
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm
index 450113ba84..af584e3d34 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -32,16 +32,16 @@ ASM_PFX(InternalMemSetMem):
push rdi
mov rax, r8
mov ah, al
- DB 0x48, 0xf, 0x6e, 0xc0 ; movd mm0, rax
+ movq mm0, rax
mov r8, rcx
mov rdi, r8 ; rdi <- Buffer
mov rcx, rdx
and edx, 7
shr rcx, 3
jz @SetBytes
- DB 0xf, 0x70, 0xC0, 0x0 ; pshufw mm0, mm0, 0h
+ pshufw mm0, mm0, 0
.0:
- DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
+ movntq [rdi], mm0
add rdi, 8
loop .0
mfence
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.nasm
index 4e1f4be2b4..7a63a1c50b 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.nasm
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -31,16 +31,16 @@ global ASM_PFX(InternalMemSetMem16)
ASM_PFX(InternalMemSetMem16):
push rdi
mov rax, r8
- DB 0x48, 0xf, 0x6e, 0xc0 ; movd mm0, rax
+ movq mm0, rax
mov r8, rcx
mov rdi, r8
mov rcx, rdx
and edx, 3
shr rcx, 2
jz @SetWords
- DB 0xf, 0x70, 0xC0, 0x0 ; pshufw mm0, mm0, 0h
+ pshufw mm0, mm0, 0
.0:
- DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
+ movntq [rdi], mm0
add rdi, 8
loop .0
mfence
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm
index b3a7385897..ab5f954826 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -28,20 +28,20 @@
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemSetMem32)
ASM_PFX(InternalMemSetMem32):
- DB 0x49, 0xf, 0x6e, 0xc0 ; movd mm0, r8 (Value)
+ movq mm0, r8
mov rax, rcx ; rax <- Buffer
xchg rcx, rdx ; rcx <- Count rdx <- Buffer
shr rcx, 1 ; rcx <- # of qwords to set
jz @SetDwords
- DB 0xf, 0x70, 0xC0, 0x44 ; pshufw mm0, mm0, 44h
+ pshufw mm0, mm0, 44h
.0:
- DB 0xf, 0xe7, 0x2 ; movntq [rdx], mm0
+ movntq [rdx], mm0
lea rdx, [rdx + 8] ; use "lea" to avoid flag changes
loop .0
mfence
@SetDwords:
jnc .1
- DB 0xf, 0x7e, 0x2 ; movd [rdx], mm0
+ movd [rdx], mm0
.1:
ret
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem64.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem64.nasm
index f517e1d23a..fcc44294a8 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem64.nasm
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem64.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -28,11 +28,11 @@
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemSetMem64)
ASM_PFX(InternalMemSetMem64):
- DB 0x49, 0xf, 0x6e, 0xc0 ; movd mm0, r8 (Value)
+ movq mm0, r8
mov rax, rcx ; rax <- Buffer
xchg rcx, rdx ; rcx <- Count
.0:
- DB 0xf, 0xe7, 0x2 ; movntq [rdx], mm0
+ movntq [rdx], mm0
add rdx, 8
loop .0
mfence
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm
index 2a85f15b55..8b02eeb732 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm
@@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
-; Copyright (c) 2006, Intel Corporation. All rights reserved.
+; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
@@ -34,12 +34,12 @@ ASM_PFX(InternalMemZeroMem):
and edx, 7
shr rcx, 3
jz @ZeroBytes
- DB 0xf, 0xef, 0xc0 ; pxor mm0, mm0
+ pxor mm0, mm0
.0:
- DB 0xf, 0xe7, 7 ; movntq [rdi], mm0
+ movntq [rdi], mm0
add rdi, 8
loop .0
- DB 0xf, 0xae, 0xf0 ; mfence
+ mfence
@ZeroBytes:
xor eax, eax
mov ecx, edx