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 */ |
64 | |