58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_OBJTOOL_TYPES_H
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#define _LINUX_OBJTOOL_TYPES_H
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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/*
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* This struct is used by asm and inline asm code to manually annotate the
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* location of registers on the stack.
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*/
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struct unwind_hint {
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u32 ip;
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s16 sp_offset;
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u8 sp_reg;
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u8 type;
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u8 signal;
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};
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#endif /* __ASSEMBLY__ */
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/*
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* UNWIND_HINT_TYPE_UNDEFINED: A blind spot in ORC coverage which can result in
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* a truncated and unreliable stack unwind.
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*
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* UNWIND_HINT_TYPE_END_OF_STACK: The end of the kernel stack unwind before
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* hitting user entry, boot code, or fork entry (when there are no pt_regs
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* available).
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*
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* UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP
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* (the caller's SP right before it made the call). Used for all callable
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* functions, i.e. all C code and all callable asm functions.
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*
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* UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset
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* points to a fully populated pt_regs from a syscall, interrupt, or exception.
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*
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* UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that
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* sp_reg+sp_offset points to the iret return frame.
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*
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* UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function.
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* Useful for code which doesn't have an ELF function annotation.
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*
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* UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain
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* location so that it can be restored later.
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*/
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#define UNWIND_HINT_TYPE_UNDEFINED 0
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#define UNWIND_HINT_TYPE_END_OF_STACK 1
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#define UNWIND_HINT_TYPE_CALL 2
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#define UNWIND_HINT_TYPE_REGS 3
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#define UNWIND_HINT_TYPE_REGS_PARTIAL 4
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/* The below hint types don't have corresponding ORC types */
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#define UNWIND_HINT_TYPE_FUNC 5
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#define UNWIND_HINT_TYPE_SAVE 6
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#define UNWIND_HINT_TYPE_RESTORE 7
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#endif /* _LINUX_OBJTOOL_TYPES_H */
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