/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#ifndef _ORC_TYPES_H
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#define _ORC_TYPES_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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/*
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* The ORC_REG_* registers are base registers which are used to find other
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* registers on the stack.
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*
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* ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
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* address of the previous frame: the caller's SP before it called the current
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* function.
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*
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* ORC_REG_UNDEFINED means the corresponding register's value didn't change in
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* the current frame.
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*
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* The most commonly used base registers are SP and BP -- which the previous SP
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* is usually based on -- and PREV_SP and UNDEFINED -- which the previous BP is
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* usually based on.
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*
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* The rest of the base registers are needed for special cases like entry code
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* and GCC realigned stacks.
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*/
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#define ORC_REG_UNDEFINED 0
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#define ORC_REG_PREV_SP 1
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#define ORC_REG_DX 2
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#define ORC_REG_DI 3
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#define ORC_REG_BP 4
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#define ORC_REG_SP 5
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#define ORC_REG_R10 6
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#define ORC_REG_R13 7
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#define ORC_REG_BP_INDIRECT 8
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#define ORC_REG_SP_INDIRECT 9
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#define ORC_REG_MAX 15
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#ifndef __ASSEMBLY__
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/*
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* This struct is more or less a vastly simplified version of the DWARF Call
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* Frame Information standard. It contains only the necessary parts of DWARF
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* CFI, simplified for ease of access by the in-kernel unwinder. It tells the
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* unwinder how to find the previous SP and BP (and sometimes entry regs) on
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* the stack for a given code address. Each instance of the struct corresponds
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* to one or more code locations.
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*/
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struct orc_entry {
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s16 sp_offset;
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s16 bp_offset;
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unsigned sp_reg:4;
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unsigned bp_reg:4;
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unsigned type:2;
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unsigned end:1;
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} __packed;
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#endif /* __ASSEMBLY__ */
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#endif /* _ORC_TYPES_H */
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