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 __attribute__((__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 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