include/asm-generic/error-injection.h

   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 generating 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
  38 static inline void override_function_with_return(struct pt_regs *regs) { }
  39 #endif
  40 #endif
  41
  42 #endif /* _ASM_GENERIC_ERROR_INJECTION_H */