The C and C++ Include Header Files

/usr/include/linux/kcov.h


$ cat -n /usr/include/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	/*
     8	 * Argument for KCOV_REMOTE_ENABLE ioctl, see Documentation/dev-tools/kcov.rst
     9	 * and the comment before kcov_remote_start() for usage details.
    10	 */
    11	struct kcov_remote_arg {
    12		__u32		trace_mode;	/* KCOV_TRACE_PC or KCOV_TRACE_CMP */
    13		__u32		area_size;	/* Length of coverage buffer in words */
    14		__u32		num_handles;	/* Size of handles array */
    15		__aligned_u64	common_handle;
    16		__aligned_u64	handles[];
    17	};
    18	
    19	#define KCOV_REMOTE_MAX_HANDLES		0x100
    20	
    21	#define KCOV_INIT_TRACE			_IOR('c', 1, unsigned long)
    22	#define KCOV_ENABLE			_IO('c', 100)
    23	#define KCOV_DISABLE			_IO('c', 101)
    24	#define KCOV_REMOTE_ENABLE		_IOW('c', 102, struct kcov_remote_arg)
    25	
    26	enum {
    27		/*
    28		 * Tracing coverage collection mode.
    29		 * Covered PCs are collected in a per-task buffer.
    30		 * In new KCOV version the mode is chosen by calling
    31		 * ioctl(fd, KCOV_ENABLE, mode). In older versions the mode argument
    32		 * was supposed to be 0 in such a call. So, for reasons of backward
    33		 * compatibility, we have chosen the value KCOV_TRACE_PC to be 0.
    34		 */
    35		KCOV_TRACE_PC = 0,
    36		/* Collecting comparison operands mode. */
    37		KCOV_TRACE_CMP = 1,
    38	};
    39	
    40	/*
    41	 * The format for the types of collected comparisons.
    42	 *
    43	 * Bit 0 shows whether one of the arguments is a compile-time constant.
    44	 * Bits 1 & 2 contain log2 of the argument size, up to 8 bytes.
    45	 */
    46	#define KCOV_CMP_CONST          (1 << 0)
    47	#define KCOV_CMP_SIZE(n)        ((n) << 1)
    48	#define KCOV_CMP_MASK           KCOV_CMP_SIZE(3)
    49	
    50	#define KCOV_SUBSYSTEM_COMMON	(0x00ull << 56)
    51	#define KCOV_SUBSYSTEM_USB	(0x01ull << 56)
    52	
    53	#define KCOV_SUBSYSTEM_MASK	(0xffull << 56)
    54	#define KCOV_INSTANCE_MASK	(0xffffffffull)
    55	
    56	static __inline__ __u64 kcov_remote_handle(__u64 subsys, __u64 inst)
    57	{
    58		if (subsys & ~KCOV_SUBSYSTEM_MASK || inst & ~KCOV_INSTANCE_MASK)
    59			return 0;
    60		return subsys | inst;
    61	}
    62	
    63	#endif /* _LINUX_KCOV_IOCTLS_H */