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 */