| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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| 2 | #ifndef _LINUX_KCOV_IOCTLS_H |
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| 3 | #define _LINUX_KCOV_IOCTLS_H |
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| 4 | |
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| 5 | #include <linux/types.h> |
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| 6 | |
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| 7 | /* |
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| 8 | * Argument for KCOV_REMOTE_ENABLE ioctl, see Documentation/dev-tools/kcov.rst |
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| 9 | * and the comment before kcov_remote_start() for usage details. |
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| 10 | */ |
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| 11 | struct kcov_remote_arg { |
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| 12 | __u32 trace_mode; /* KCOV_TRACE_PC or KCOV_TRACE_CMP */ |
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| 13 | __u32 area_size; /* Length of coverage buffer in words */ |
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| 14 | __u32 num_handles; /* Size of handles array */ |
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| 15 | __aligned_u64 common_handle; |
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| 16 | __aligned_u64 handles[]; |
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| 17 | }; |
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| 18 | |
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| 19 | #define KCOV_REMOTE_MAX_HANDLES 0x100 |
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| 20 | |
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| 21 | #define KCOV_INIT_TRACE _IOR('c', 1, unsigned long) |
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| 22 | #define KCOV_ENABLE _IO('c', 100) |
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| 23 | #define KCOV_DISABLE _IO('c', 101) |
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| 24 | #define KCOV_REMOTE_ENABLE _IOW('c', 102, struct kcov_remote_arg) |
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| 25 | |
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| 26 | enum { |
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| 27 | /* |
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| 28 | * Tracing coverage collection mode. |
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| 29 | * Covered PCs are collected in a per-task buffer. |
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| 30 | * In new KCOV version the mode is chosen by calling |
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| 31 | * ioctl(fd, KCOV_ENABLE, mode). In older versions the mode argument |
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| 32 | * was supposed to be 0 in such a call. So, for reasons of backward |
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| 33 | * compatibility, we have chosen the value KCOV_TRACE_PC to be 0. |
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| 34 | */ |
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| 35 | KCOV_TRACE_PC = 0, |
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| 36 | /* Collecting comparison operands mode. */ |
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| 37 | KCOV_TRACE_CMP = 1, |
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| 38 | }; |
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| 39 | |
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| 40 | /* |
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| 41 | * The format for the types of collected comparisons. |
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| 42 | * |
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| 43 | * Bit 0 shows whether one of the arguments is a compile-time constant. |
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| 44 | * Bits 1 & 2 contain log2 of the argument size, up to 8 bytes. |
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| 45 | */ |
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| 46 | #define KCOV_CMP_CONST (1 << 0) |
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| 47 | #define KCOV_CMP_SIZE(n) ((n) << 1) |
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| 48 | #define KCOV_CMP_MASK KCOV_CMP_SIZE(3) |
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| 49 | |
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| 50 | #define KCOV_SUBSYSTEM_COMMON (0x00ull << 56) |
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| 51 | #define KCOV_SUBSYSTEM_USB (0x01ull << 56) |
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| 52 | |
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| 53 | #define KCOV_SUBSYSTEM_MASK (0xffull << 56) |
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| 54 | #define KCOV_INSTANCE_MASK (0xffffffffull) |
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| 55 | |
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| 56 | static inline __u64 kcov_remote_handle(__u64 subsys, __u64 inst) |
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| 57 | { |
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| 58 | if (subsys & ~KCOV_SUBSYSTEM_MASK || inst & ~KCOV_INSTANCE_MASK) |
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| 59 | return 0; |
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| 60 | return subsys | inst; |
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| 61 | } |
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| 62 | |
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| 63 | #endif /* _LINUX_KCOV_IOCTLS_H */ |
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| 64 | |
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