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