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
  11 enum {
  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 */