include/linux/kcov.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_KCOV_H
   3 #define _LINUX_KCOV_H
   4
   5 #include <uapi/linux/kcov.h>
   6
   7 struct task_struct;
   8
   9 #ifdef CONFIG_KCOV
  10
  11 enum kcov_mode {
  12         /* Coverage collection is not enabled yet. */
  13         KCOV_MODE_DISABLED = 0,
  14         /* KCOV was initialized, but tracing mode hasn't been chosen yet. */
  15         KCOV_MODE_INIT = 1,
  16         /*
  17          * Tracing coverage collection mode.
  18          * Covered PCs are collected in a per-task buffer.
  19          */
  20         KCOV_MODE_TRACE_PC = 2,
  21         /* Collecting comparison operands mode. */
  22         KCOV_MODE_TRACE_CMP = 3,
  23 };
  24
  25 #define KCOV_IN_CTXSW   (1 << 30)
  26
  27 void kcov_task_init(struct task_struct *t);
  28 void kcov_task_exit(struct task_struct *t);
  29
  30 #define kcov_prepare_switch(t)                  \
  31 do {                                            \
  32         (t)->kcov_mode |= KCOV_IN_CTXSW;        \
  33 } while (0)
  34
  35 #define kcov_finish_switch(t)                   \
  36 do {                                            \
  37         (t)->kcov_mode &= ~KCOV_IN_CTXSW;       \
  38 } while (0)
  39
  40 #else
  41
  42 static inline void kcov_task_init(struct task_struct *t) {}
  43 static inline void kcov_task_exit(struct task_struct *t) {}
  44 static inline void kcov_prepare_switch(struct task_struct *t) {}
  45 static inline void kcov_finish_switch(struct task_struct *t) {}
  46
  47 #endif /* CONFIG_KCOV */
  48 #endif /* _LINUX_KCOV_H */