mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-27 12:15:19 +01:00
51 lines
1.2 KiB
PHP
51 lines
1.2 KiB
PHP
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
; Abstract:
|
|
;
|
|
; This file provides macro definitions for stuffing the Return Stack Buffer (RSB)
|
|
; for NASM files.
|
|
;
|
|
;------------------------------------------------------------------------------
|
|
|
|
%define RSB_STUFF_ENTRIES 0x20
|
|
|
|
;
|
|
; parameters:
|
|
; @param 1: register to use as counter (e.g. IA32:eax, X64:rax)
|
|
; @param 2: stack pointer to restore (IA32:esp, X64:rsp)
|
|
; @param 3: the size of a stack frame (IA32:4, X64:8)
|
|
;
|
|
%macro StuffRsb 3
|
|
mov %1, RSB_STUFF_ENTRIES / 2
|
|
%%Unroll1:
|
|
call %%Unroll2
|
|
%%SpecTrap1:
|
|
pause
|
|
lfence
|
|
jmp %%SpecTrap1
|
|
%%Unroll2:
|
|
call %%StuffLoop
|
|
%%SpecTrap2:
|
|
pause
|
|
lfence
|
|
jmp %%SpecTrap2
|
|
%%StuffLoop:
|
|
dec %1
|
|
jnz %%Unroll1
|
|
add %2, RSB_STUFF_ENTRIES * %3 ; Restore the stack pointer
|
|
%endmacro
|
|
|
|
;
|
|
; RSB stuffing macros for IA32 and X64
|
|
;
|
|
%macro StuffRsb32 0
|
|
StuffRsb eax, esp, 4
|
|
%endmacro
|
|
|
|
%macro StuffRsb64 0
|
|
StuffRsb rax, rsp, 8
|
|
%endmacro
|