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; |
19 | }; |
20 | |
21 | #endif /* __ASSEMBLY__ */ |
22 | |
23 | /* |
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 | * |
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 | * |
41 | * UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function. |
42 | * Useful for code which doesn't have an ELF function annotation. |
43 | * |
44 | * UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain |
45 | * location so that it can be restored later. |
46 | */ |
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 |
52 | /* The below hint types don't have corresponding ORC types */ |
53 | #define UNWIND_HINT_TYPE_FUNC 5 |
54 | #define UNWIND_HINT_TYPE_SAVE 6 |
55 | #define UNWIND_HINT_TYPE_RESTORE 7 |
56 | |
57 | #endif /* _LINUX_OBJTOOL_TYPES_H */ |
58 | |