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
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