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| ;------------------------------------------------------------------------------
| ;
| ; 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
|
|
