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Last change
on this file since 100307 was 80721, checked in by vboxsync, 5 years ago |
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Devices/EFI/FirmwareNew: Start upgrade process to edk2-stable201908 (compiles on Windows and works to some extent), bugref:4643
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Property svn:eol-style
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File size:
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| 1 | ;------------------------------------------------------------------------------
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| 2 | ;
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| 3 | ; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
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| 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent
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| 5 | ;
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| 6 | ; Abstract:
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| 7 | ;
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| 8 | ; This file provides macro definitions for stuffing the Return Stack Buffer (RSB)
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| 9 | ; for NASM files.
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| 10 | ;
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| 11 | ;------------------------------------------------------------------------------
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| 12 |
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| 13 | %define RSB_STUFF_ENTRIES 0x20
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| 14 |
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| 15 | ;
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| 16 | ; parameters:
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| 17 | ; @param 1: register to use as counter (e.g. IA32:eax, X64:rax)
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| 18 | ; @param 2: stack pointer to restore (IA32:esp, X64:rsp)
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| 19 | ; @param 3: the size of a stack frame (IA32:4, X64:8)
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| 20 | ;
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| 21 | %macro StuffRsb 3
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| 22 | mov %1, RSB_STUFF_ENTRIES / 2
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| 23 | %%Unroll1:
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| 24 | call %%Unroll2
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| 25 | %%SpecTrap1:
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| 26 | pause
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| 27 | lfence
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| 28 | jmp %%SpecTrap1
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| 29 | %%Unroll2:
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| 30 | call %%StuffLoop
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| 31 | %%SpecTrap2:
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| 32 | pause
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| 33 | lfence
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| 34 | jmp %%SpecTrap2
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| 35 | %%StuffLoop:
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| 36 | dec %1
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| 37 | jnz %%Unroll1
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| 38 | add %2, RSB_STUFF_ENTRIES * %3 ; Restore the stack pointer
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| 39 | %endmacro
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| 40 |
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| 41 | ;
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| 42 | ; RSB stuffing macros for IA32 and X64
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| 43 | ;
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| 44 | %macro StuffRsb32 0
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| 45 | StuffRsb eax, esp, 4
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| 46 | %endmacro
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| 47 |
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| 48 | %macro StuffRsb64 0
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| 49 | StuffRsb rax, rsp, 8
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| 50 | %endmacro
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