kcov.h (1961B) - Raw
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 */