diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/SetJump.nasm')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/SetJump.nasm | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/SetJump.nasm b/MdePkg/Library/BaseLib/Ia32/SetJump.nasm index 58074b87ccb6..be66237ec8a2 100644 --- a/MdePkg/Library/BaseLib/Ia32/SetJump.nasm +++ b/MdePkg/Library/BaseLib/Ia32/SetJump.nasm @@ -1,13 +1,7 @@ ;------------------------------------------------------------------------------ ; -; 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. +; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR> +; SPDX-License-Identifier: BSD-2-Clause-Patent ; ; Module Name: ; @@ -19,9 +13,12 @@ ; ;------------------------------------------------------------------------------ +%include "Nasm.inc" + SECTION .text extern ASM_PFX(InternalAssertJumpBuffer) +extern ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask)) ;------------------------------------------------------------------------------ ; UINTN @@ -37,6 +34,24 @@ ASM_PFX(SetJump): pop ecx pop ecx ; ecx <- return address mov edx, [esp] + + xor eax, eax + mov [edx + 24], eax ; save 0 to SSP + + mov eax, [ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))] + test eax, eax + jz CetDone + mov eax, cr4 + bt eax, 23 ; check if CET is enabled + jnc CetDone + + mov eax, 1 + INCSSP_EAX ; to read original SSP + READSSP_EAX + mov [edx + 0x24], eax ; save SSP + +CetDone: + mov [edx], ebx mov [edx + 4], esi mov [edx + 8], edi |