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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* SPDX-License-Identifier: GPL-2.0 */ /* Simple ftrace probe wrapper */ #ifndef _LINUX_FPROBE_H #define _LINUX_FPROBE_H #include <linux/compiler.h> #include <linux/ftrace.h> #include <linux/rethook.h> /** * struct fprobe - ftrace based probe. * @ops: The ftrace_ops. * @nmissed: The counter for missing events. * @flags: The status flag. * @rethook: The rethook data structure. (internal data) * @entry_handler: The callback function for function entry. * @exit_handler: The callback function for function exit. */ struct fprobe { #ifdef CONFIG_FUNCTION_TRACER /* * If CONFIG_FUNCTION_TRACER is not set, CONFIG_FPROBE is disabled too. * But user of fprobe may keep embedding the struct fprobe on their own * code. To avoid build error, this will keep the fprobe data structure * defined here, but remove ftrace_ops data structure. */ struct ftrace_ops ops; #endif unsigned long nmissed; unsigned int flags; struct rethook *rethook; void (*entry_handler)(struct fprobe *fp, unsigned long entry_ip, struct pt_regs *regs); void (*exit_handler)(struct fprobe *fp, unsigned long entry_ip, struct pt_regs *regs); }; /* This fprobe is soft-disabled. */ #define FPROBE_FL_DISABLED 1 /* * This fprobe handler will be shared with kprobes. * This flag must be set before registering. */ #define FPROBE_FL_KPROBE_SHARED 2 static inline bool fprobe_disabled(struct fprobe *fp) { return (fp) ? fp->flags & FPROBE_FL_DISABLED : false; } static inline bool fprobe_shared_with_kprobes(struct fprobe *fp) { return (fp) ? fp->flags & FPROBE_FL_KPROBE_SHARED : false; } #ifdef CONFIG_FPROBE int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter); int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num); int register_fprobe_syms(struct fprobe *fp, const char **syms, int num); int unregister_fprobe(struct fprobe *fp); #else static inline int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter) { return -EOPNOTSUPP; } static inline int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num) { return -EOPNOTSUPP; } static inline int register_fprobe_syms(struct fprobe *fp, const char **syms, int num) { return -EOPNOTSUPP; } static inline int unregister_fprobe(struct fprobe *fp) { return -EOPNOTSUPP; } #endif /** * disable_fprobe() - Disable fprobe * @fp: The fprobe to be disabled. * * This will soft-disable @fp. Note that this doesn't remove the ftrace * hooks from the function entry. */ static inline void disable_fprobe(struct fprobe *fp) { if (fp) fp->flags |= FPROBE_FL_DISABLED; } /** * enable_fprobe() - Enable fprobe * @fp: The fprobe to be enabled. * * This will soft-enable @fp. */ static inline void enable_fprobe(struct fprobe *fp) { if (fp) fp->flags &= ~FPROBE_FL_DISABLED; } #endif |