;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
; Module Name: | |
; | |
; LongJump.Asm | |
; | |
; Abstract: | |
; | |
; Implementation of _LongJump() on x64. | |
; | |
;------------------------------------------------------------------------------ | |
%include "Nasm.inc" | |
DEFAULT REL | |
SECTION .text | |
extern ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask)) | |
;------------------------------------------------------------------------------ | |
; VOID | |
; EFIAPI | |
; InternalLongJump ( | |
; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer, | |
; IN UINTN Value | |
; ); | |
;------------------------------------------------------------------------------ | |
global ASM_PFX(InternalLongJump) | |
ASM_PFX(InternalLongJump): | |
mov eax, [ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))] | |
test eax, eax | |
jz CetDone | |
mov rax, cr4 | |
bt eax, 23 ; check if CET is enabled | |
jnc CetDone | |
push rdx ; save rdx | |
mov rdx, [rcx + 0xF8] ; rdx = target SSP | |
rdsspq rax | |
sub rdx, rax ; rdx = delta | |
mov rax, rdx ; rax = delta | |
shr rax, 3 ; rax = delta/sizeof(UINT64) | |
incsspq rax | |
pop rdx ; restore rdx | |
CetDone: | |
mov rbx, [rcx] | |
mov rsp, [rcx + 8] | |
mov rbp, [rcx + 0x10] | |
mov rdi, [rcx + 0x18] | |
mov rsi, [rcx + 0x20] | |
mov r12, [rcx + 0x28] | |
mov r13, [rcx + 0x30] | |
mov r14, [rcx + 0x38] | |
mov r15, [rcx + 0x40] | |
; load non-volatile fp registers | |
ldmxcsr [rcx + 0x50] | |
movdqu xmm6, [rcx + 0x58] | |
movdqu xmm7, [rcx + 0x68] | |
movdqu xmm8, [rcx + 0x78] | |
movdqu xmm9, [rcx + 0x88] | |
movdqu xmm10, [rcx + 0x98] | |
movdqu xmm11, [rcx + 0xA8] | |
movdqu xmm12, [rcx + 0xB8] | |
movdqu xmm13, [rcx + 0xC8] | |
movdqu xmm14, [rcx + 0xD8] | |
movdqu xmm15, [rcx + 0xE8] | |
mov rax, rdx ; set return value | |
jmp qword [rcx + 0x48] | |