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_NONE,		/* Dummy value for undefined case */
8 	EI_ETYPE_NULL,		/* Return NULL if failure */
9 	EI_ETYPE_ERRNO,		/* Return -ERRNO if failure */
10 	EI_ETYPE_ERRNO_NULL,	/* Return -ERRNO or NULL if failure */
11 	EI_ETYPE_TRUE,		/* Return true if failure */
12 };
13 
14 struct error_injection_entry {
15 	unsigned long	addr;
16 	int		etype;
17 };
18 
19 struct pt_regs;
20 
21 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
22 /*
23  * Whitelist ganerating macro. Specify functions which can be
24  * error-injectable using this macro.
25  */
26 #define ALLOW_ERROR_INJECTION(fname, _etype)				\
27 static struct error_injection_entry __used				\
28 	__section("_error_injection_whitelist")				\
29 	_eil_addr_##fname = {						\
30 		.addr = (unsigned long)fname,				\
31 		.etype = EI_ETYPE_##_etype,				\
32 	};
33 
34 void override_function_with_return(struct pt_regs *regs);
35 #else
36 #define ALLOW_ERROR_INJECTION(fname, _etype)
37 
override_function_with_return(struct pt_regs * regs)38 static inline void override_function_with_return(struct pt_regs *regs) { }
39 #endif
40 #endif
41 
42 #endif /* _ASM_GENERIC_ERROR_INJECTION_H */
43