LXR linux/include/uapi/linux/kcov.h

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _LINUX_KCOV_IOCTLS_H
   3#define _LINUX_KCOV_IOCTLS_H
   4
   5#include <linux/types.h>
   6
   7#define KCOV_INIT_TRACE                 _IOR('c', 1, unsigned long)
   8#define KCOV_ENABLE                     _IO('c', 100)
   9#define KCOV_DISABLE                    _IO('c', 101)
  10
  11enum {
  12        /*
  13         * Tracing coverage collection mode.
  14         * Covered PCs are collected in a per-task buffer.
  15         * In new KCOV version the mode is chosen by calling
  16         * ioctl(fd, KCOV_ENABLE, mode). In older versions the mode argument
  17         * was supposed to be 0 in such a call. So, for reasons of backward
  18         * compatibility, we have chosen the value KCOV_TRACE_PC to be 0.
  19         */
  20        KCOV_TRACE_PC = 0,
  21        /* Collecting comparison operands mode. */
  22        KCOV_TRACE_CMP = 1,
  23};
  24
  25/*
  26 * The format for the types of collected comparisons.
  27 *
  28 * Bit 0 shows whether one of the arguments is a compile-time constant.
  29 * Bits 1 & 2 contain log2 of the argument size, up to 8 bytes.
  30 */
  31#define KCOV_CMP_CONST          (1 << 0)
  32#define KCOV_CMP_SIZE(n)        ((n) << 1)
  33#define KCOV_CMP_MASK           KCOV_CMP_SIZE(3)
  34
  35#endif /* _LINUX_KCOV_IOCTLS_H */
  36