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 */
36