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