mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-23 16:17:40 +01:00
64 lines
1.7 KiB
NASM
64 lines
1.7 KiB
NASM
|
;------------------------------------------------------------------------------
|
||
|
|
;
|
||
|
|
; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
|
||
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
;
|
||
|
|
; Module Name:
|
||
|
|
;
|
||
|
|
; SetJump.Asm
|
||
|
|
;
|
||
|
|
; Abstract:
|
||
|
|
;
|
||
|
|
; Implementation of SetJump() on IA-32.
|
||
|
|
;
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
%include "Nasm.inc"
|
||
|
|
|
||
|
|
SECTION .text
|
||
|
|
|
||
|
|
extern ASM_PFX(InternalAssertJumpBuffer)
|
||
|
|
extern ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))
|
||
|
|
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
; UINTN
|
||
|
|
; EFIAPI
|
||
|
|
; SetJump (
|
||
|
|
; OUT BASE_LIBRARY_JUMP_BUFFER *JumpBuffer
|
||
|
|
; );
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
global ASM_PFX(SetJump)
|
||
|
|
ASM_PFX(SetJump):
|
||
|
|
push DWORD [esp + 4]
|
||
|
|
call ASM_PFX(InternalAssertJumpBuffer) ; To validate JumpBuffer
|
||
|
|
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
|
||
|
|
mov [edx + 12], ebp
|
||
|
|
mov [edx + 16], esp
|
||
|
|
mov [edx + 20], ecx ; eip value to restore in LongJump
|
||
|
|
xor eax, eax
|
||
|
|
jmp ecx
|
||
|
|
|