/* * Common header file for probe-based Dynamic events. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * * This code was copied from kernel/trace/trace_kprobe.h written by * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> * * Updates to make this generic: * Copyright (C) IBM Corporation, 2010-2011 * Author:     Srikar Dronamraju */ #include <linux/seq_file.h>#include <linux/slab.h>#include <linux/smp.h>#include <linux/debugfs.h>#include <linux/types.h>#include <linux/string.h>#include <linux/ctype.h>#include <linux/ptrace.h>#include <linux/perf_event.h>#include <linux/kprobes.h>#include <linux/stringify.h>#include <linux/limits.h>#include <linux/uaccess.h>#include <asm/bitsperlong.h> #include "trace.h"#include "trace_output.h" #define MAX_TRACE_ARGS		128#define MAX_ARGSTR_LEN		63#define MAX_EVENT_NAME_LEN	64#define MAX_STRING_SIZE		PATH_MAX /* Reserved field names */#define FIELD_STRING_IP		"__probe_ip"#define FIELD_STRING_RETIP	"__probe_ret_ip"#define FIELD_STRING_FUNC	"__probe_func" #undef DEFINE_FIELD#define DEFINE_FIELD(type, item, name, is_signed)			\	do {								\		ret = trace_define_field(event_call, #type, name,	\					 offsetof(typeof(field), item),	\					 sizeof(field.item), is_signed, \					 FILTER_OTHER);			\		if (ret)						\			return ret;					\	} while (0)  /* Flags for trace_probe */#define TP_FLAG_TRACE		1#define TP_FLAG_PROFILE		2#define TP_FLAG_REGISTERED	4  /* data_rloc: data relative location, compatible with u32 */#define make_data_rloc(len, roffs)	\	(((u32)(len) << 16) | ((u32)(roffs) & 0xffff))#define get_rloc_len(dl)		((u32)(dl) >> 16)#define get_rloc_offs(dl)		((u32)(dl) & 0xffff) /* * Convert data_rloc to data_loc: *  data_rloc stores the offset from data_rloc itself, but data_loc *  stores the offset from event entry. */#define convert_rloc_to_loc(dl, offs)	((u32)(dl) + (offs)) /* Data fetch function type */typedef	void (*fetch_func_t)(struct pt_regs *, void *, void *);/* Printing function type */typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *, void *); /* Fetch types */enum {	FETCH_MTD_reg = 0,	FETCH_MTD_stack,	FETCH_MTD_retval,	FETCH_MTD_memory,	FETCH_MTD_symbol,	FETCH_MTD_deref,	FETCH_MTD_bitfield,	FETCH_MTD_END,}; /* Fetch type information table */struct fetch_type {	const char		*name;		/* Name of type */	size_t			size;		/* Byte size of type */	int			is_signed;	/* Signed flag */	print_type_func_t	print;		/* Print functions */	const char		*fmt;		/* Fromat string */	const char		*fmttype;	/* Name in format file */	/* Fetch functions */	fetch_func_t		fetch[FETCH_MTD_END];}; struct fetch_param {	fetch_func_t		fn;	void 			*data;}; struct probe_arg {	struct fetch_param	fetch;	struct fetch_param	fetch_size;	unsigned int		offset;	/* Offset from argument entry */	const char		*name;	/* Name of this argument */	const char		*comm;	/* Command of this argument */	const struct fetch_type	*type;	/* Type of this argument */}; static inline __kprobes void call_fetch(struct fetch_param *fprm,				 struct pt_regs *regs, void *dest){	return fprm->fn(regs, fprm->data, dest);} /* Check the name is good for event/group/fields */static inline int is_good_name(const char *name){	if (!isalpha(*name) && *name != '_')		return 0;	while (*++name != '\0') {		if (!isalpha(*name) && !isdigit(*name) && *name != '_')			return 0;	}	return 1;} extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,		   struct probe_arg *parg, bool is_return, bool is_kprobe); extern int traceprobe_conflict_field_name(const char *name,			       struct probe_arg *args, int narg); extern void traceprobe_update_arg(struct probe_arg *arg);extern void traceprobe_free_probe_arg(struct probe_arg *arg); extern int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset); extern ssize_t traceprobe_probes_write(struct file *file,		const char __user *buffer, size_t count, loff_t *ppos,		int (*createfn)(int, char**)); extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));