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Unwind hints are useful to provide objtool with information about stack states in non-standard functions/code. While the type of information being provided might be very arch specific, the mechanism to provide the information can be useful for other architectures. Move the relevant unwint hint definitions for all architectures to see. [ jpoimboe: REGS_IRET -> REGS_PARTIAL ] Signed-off-by: Julien Thierry <jthierry@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* 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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