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64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: GPL-3.0-or-later
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/**
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* @file
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*
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* ORC unwinder definitions.
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*
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* As of Linux v5.12, ORC is only defined for x86-64. This file assumes that the
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* overall format would be the same for other architectures other than
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* architecture-specific register numbers, but this may require reorganization
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* if that isn't the case.
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*/
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#ifndef DRGN_ORC_H
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#define DRGN_ORC_H
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#include <stdbool.h>
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#include <stdint.h>
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struct drgn_orc_entry {
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int16_t sp_offset;
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int16_t bp_offset;
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/*
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* This is represented by 4 bit fields in the Linux kernel, but this is
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* easier to deal with.
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*/
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uint16_t flags;
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};
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/* These correspond to UNWIND_HINT_* in the Linux kernel. */
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enum {
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DRGN_ORC_TYPE_CALL = 0,
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DRGN_ORC_TYPE_REGS = 1,
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DRGN_ORC_TYPE_REGS_PARTIAL = 2,
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};
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static inline int drgn_orc_sp_reg(const struct drgn_orc_entry *orc)
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{
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return orc->flags & 0xf;
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}
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static inline int drgn_orc_bp_reg(const struct drgn_orc_entry *orc)
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{
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return (orc->flags >> 4) & 0xf;
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}
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static inline int drgn_orc_type(const struct drgn_orc_entry *orc)
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{
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return (orc->flags >> 8) & 0x3;
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}
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static inline bool drgn_orc_is_end(const struct drgn_orc_entry *orc)
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{
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return orc->flags & 0x400;
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}
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static inline bool drgn_orc_flags_is_terminator(uint16_t flags)
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{
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return (flags & 0x40f) == 0;
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}
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#endif /* DRGN_ORC_H */
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