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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orc_lookup.h (1065B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
      4 */
      5#ifndef _ORC_LOOKUP_H
      6#define _ORC_LOOKUP_H
      7
      8/*
      9 * This is a lookup table for speeding up access to the .orc_unwind table.
     10 * Given an input address offset, the corresponding lookup table entry
     11 * specifies a subset of the .orc_unwind table to search.
     12 *
     13 * Each block represents the end of the previous range and the start of the
     14 * next range.  An extra block is added to give the last range an end.
     15 *
     16 * The block size should be a power of 2 to avoid a costly 'div' instruction.
     17 *
     18 * A block size of 256 was chosen because it roughly doubles unwinder
     19 * performance while only adding ~5% to the ORC data footprint.
     20 */
     21#define LOOKUP_BLOCK_ORDER	8
     22#define LOOKUP_BLOCK_SIZE	(1 << LOOKUP_BLOCK_ORDER)
     23
     24#ifndef LINKER_SCRIPT
     25
     26extern unsigned int orc_lookup[];
     27extern unsigned int orc_lookup_end[];
     28
     29#define LOOKUP_START_IP		(unsigned long)_stext
     30#define LOOKUP_STOP_IP		(unsigned long)_etext
     31
     32#endif /* LINKER_SCRIPT */
     33
     34#endif /* _ORC_LOOKUP_H */