1;------------------------------------------------------------------------------ 2; 3; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR> 4; SPDX-License-Identifier: BSD-2-Clause-Patent 5; 6; Module Name: 7; 8; SetJump.Asm 9; 10; Abstract: 11; 12; Implementation of SetJump() on x64. 13; 14;------------------------------------------------------------------------------ 15 16%include "Nasm.inc" 17 18 DEFAULT REL 19 SECTION .text 20 21extern ASM_PFX(InternalAssertJumpBuffer) 22extern ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask)) 23 24;------------------------------------------------------------------------------ 25; UINTN 26; EFIAPI 27; SetJump ( 28; OUT BASE_LIBRARY_JUMP_BUFFER *JumpBuffer 29; ); 30;------------------------------------------------------------------------------ 31global ASM_PFX(SetJump) 32ASM_PFX(SetJump): 33 push rcx 34 add rsp, -0x20 35 call ASM_PFX(InternalAssertJumpBuffer) 36 add rsp, 0x20 37 pop rcx 38 pop rdx 39 40 xor rax, rax 41 mov [rcx + 0xF8], rax ; save 0 to SSP 42 43 mov eax, [ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))] 44 test eax, eax 45 jz CetDone 46 mov rax, cr4 47 bt eax, 23 ; check if CET is enabled 48 jnc CetDone 49 50 mov rax, 1 51 INCSSP_RAX ; to read original SSP 52 READSSP_RAX 53 mov [rcx + 0xF8], rax ; save SSP 54 55CetDone: 56 57 mov [rcx], rbx 58 mov [rcx + 8], rsp 59 mov [rcx + 0x10], rbp 60 mov [rcx + 0x18], rdi 61 mov [rcx + 0x20], rsi 62 mov [rcx + 0x28], r12 63 mov [rcx + 0x30], r13 64 mov [rcx + 0x38], r14 65 mov [rcx + 0x40], r15 66 mov [rcx + 0x48], rdx 67 ; save non-volatile fp registers 68 stmxcsr [rcx + 0x50] 69 movdqu [rcx + 0x58], xmm6 70 movdqu [rcx + 0x68], xmm7 71 movdqu [rcx + 0x78], xmm8 72 movdqu [rcx + 0x88], xmm9 73 movdqu [rcx + 0x98], xmm10 74 movdqu [rcx + 0xA8], xmm11 75 movdqu [rcx + 0xB8], xmm12 76 movdqu [rcx + 0xC8], xmm13 77 movdqu [rcx + 0xD8], xmm14 78 movdqu [rcx + 0xE8], xmm15 79 xor rax, rax 80 jmp rdx 81 82