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__)
6enum {
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
13struct error_injection_entry {
14 unsigned long addr;
15 int etype;
16};
17
18struct 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) \
28static 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
35void override_function_with_return(struct pt_regs *regs);
36#else
37#define ALLOW_ERROR_INJECTION(fname, _etype)
38
39static inline void override_function_with_return(struct pt_regs *regs) { }
40#endif
41#endif
42
43#endif /* _ASM_GENERIC_ERROR_INJECTION_H */
44