cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pac_corruptor.S (399B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* Copyright (C) 2020 ARM Limited */
      3
      4.global pac_corruptor
      5
      6.text
      7/*
      8 * Corrupting a single bit of the PAC ensures the authentication will fail.  It
      9 * also guarantees no possible collision. TCR_EL1.TBI0 is set by default so no
     10 * top byte PAC is tested
     11 */
     12 pac_corruptor:
     13	paciasp
     14
     15	/* corrupt the top bit of the PAC */
     16	eor lr, lr, #1 << 53
     17
     18	autiasp
     19	ret