/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2017 Josh Poimboeuf <[email protected]> */ #ifndef _ORC_LOOKUP_H #define _ORC_LOOKUP_H /* * This is a lookup table for speeding up access to the .orc_unwind table. * Given an input address offset, the corresponding lookup table entry * specifies a subset of the .orc_unwind table to search. * * Each block represents the end of the previous range and the start of the * next range. An extra block is added to give the last range an end. * * The block size should be a power of 2 to avoid a costly 'div' instruction. * * A block size of 256 was chosen because it roughly doubles unwinder * performance while only adding ~5% to the ORC data footprint. */ #define LOOKUP_BLOCK_ORDER … #define LOOKUP_BLOCK_SIZE … #ifndef LINKER_SCRIPT extern unsigned int orc_lookup[]; extern unsigned int orc_lookup_end[]; #define LOOKUP_START_IP … #define LOOKUP_STOP_IP … #endif /* LINKER_SCRIPT */ #endif /* _ORC_LOOKUP_H */
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