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