1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _ASM_GENERIC_ERROR_INJECTION_H |
3 | #define _ASM_GENERIC_ERROR_INJECTION_H |
4 | |
5 | #if defined(__KERNEL__) && !defined(__ASSEMBLY__) |
6 | enum { |
7 | EI_ETYPE_NULL, /* Return NULL if failure */ |
8 | EI_ETYPE_ERRNO, /* Return -ERRNO if failure */ |
9 | EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */ |
10 | EI_ETYPE_TRUE, /* Return true if failure */ |
11 | }; |
12 | |
13 | struct error_injection_entry { |
14 | unsigned long addr; |
15 | int etype; |
16 | }; |
17 | |
18 | struct pt_regs; |
19 | |
20 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION |
21 | /* |
22 | * Whitelist generating macro. Specify functions which can be error-injectable |
23 | * using this macro. If you unsure what is required for the error-injectable |
24 | * functions, please read Documentation/fault-injection/fault-injection.rst |
25 | * 'Error Injectable Functions' section. |
26 | */ |
27 | #define ALLOW_ERROR_INJECTION(fname, _etype) \ |
28 | static struct error_injection_entry __used \ |
29 | __section("_error_injection_whitelist") \ |
30 | _eil_addr_##fname = { \ |
31 | .addr = (unsigned long)fname, \ |
32 | .etype = EI_ETYPE_##_etype, \ |
33 | } |
34 | |
35 | void override_function_with_return(struct pt_regs *regs); |
36 | #else |
37 | #define ALLOW_ERROR_INJECTION(fname, _etype) |
38 | |
39 | static inline void override_function_with_return(struct pt_regs *regs) { } |
40 | #endif |
41 | #endif |
42 | |
43 | #endif /* _ASM_GENERIC_ERROR_INJECTION_H */ |
44 | |