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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_OBJTOOL_TYPES_H | |
3 | #define _LINUX_OBJTOOL_TYPES_H | |
4 | ||
5 | #ifndef __ASSEMBLY__ | |
6 | ||
7 | #include <linux/types.h> | |
8 | ||
9 | /* | |
10 | * This struct is used by asm and inline asm code to manually annotate the | |
11 | * location of registers on the stack. | |
12 | */ | |
13 | struct unwind_hint { | |
14 | u32 ip; | |
15 | s16 sp_offset; | |
16 | u8 sp_reg; | |
17 | u8 type; | |
18 | u8 signal; | |
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19 | }; |
20 | ||
21 | #endif /* __ASSEMBLY__ */ | |
22 | ||
23 | /* | |
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24 | * UNWIND_HINT_TYPE_UNDEFINED: A blind spot in ORC coverage which can result in |
25 | * a truncated and unreliable stack unwind. | |
26 | * | |
27 | * UNWIND_HINT_TYPE_END_OF_STACK: The end of the kernel stack unwind before | |
28 | * hitting user entry, boot code, or fork entry (when there are no pt_regs | |
29 | * available). | |
30 | * | |
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31 | * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP |
32 | * (the caller's SP right before it made the call). Used for all callable | |
33 | * functions, i.e. all C code and all callable asm functions. | |
34 | * | |
35 | * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset | |
36 | * points to a fully populated pt_regs from a syscall, interrupt, or exception. | |
37 | * | |
38 | * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that | |
39 | * sp_reg+sp_offset points to the iret return frame. | |
40 | * | |
fb799447 | 41 | * UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function. |
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42 | * Useful for code which doesn't have an ELF function annotation. |
43 | * | |
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44 | * UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain |
45 | * location so that it can be restored later. | |
f7515d9f | 46 | */ |
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47 | #define UNWIND_HINT_TYPE_UNDEFINED 0 |
48 | #define UNWIND_HINT_TYPE_END_OF_STACK 1 | |
49 | #define UNWIND_HINT_TYPE_CALL 2 | |
50 | #define UNWIND_HINT_TYPE_REGS 3 | |
51 | #define UNWIND_HINT_TYPE_REGS_PARTIAL 4 | |
f902cfdd | 52 | /* The below hint types don't have corresponding ORC types */ |
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53 | #define UNWIND_HINT_TYPE_FUNC 5 |
54 | #define UNWIND_HINT_TYPE_SAVE 6 | |
55 | #define UNWIND_HINT_TYPE_RESTORE 7 | |
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56 | |
57 | #endif /* _LINUX_OBJTOOL_TYPES_H */ |