[mirror_ubuntu-artful-kernel.git] / kernel / trace / trace_probe.h

/*
 * 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))

static inline void *get_rloc_data(u32 *dl)
{
	return (u8 *)dl + get_rloc_offs(*dl);
}

/* For data_loc conversion */
static inline void *get_loc_data(u32 *dl, void *ent)
{
	return (u8 *)ent + get_rloc_offs(*dl);
}

/* 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;
};

/* For defining macros, define string/string_size types */
typedef u32 string;
typedef u32 string_size;

#define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
#define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type

/* Printing  in basic type function template */
#define DECLARE_BASIC_PRINT_TYPE_FUNC(type)				\
__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,		\
					 const char *name,		\
					 void *data, void *ent);	\
extern const char PRINT_TYPE_FMT_NAME(type)[]

DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
DECLARE_BASIC_PRINT_TYPE_FUNC(string);

#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type

/* Declare macro for basic types */
#define DECLARE_FETCH_FUNC(method, type)				\
extern void FETCH_FUNC_NAME(method, type)(struct pt_regs *regs, 	\
					  void *data, void *dest)

#define DECLARE_BASIC_FETCH_FUNCS(method) 	\
DECLARE_FETCH_FUNC(method, u8);			\
DECLARE_FETCH_FUNC(method, u16);		\
DECLARE_FETCH_FUNC(method, u32);		\
DECLARE_FETCH_FUNC(method, u64)

DECLARE_BASIC_FETCH_FUNCS(reg);
#define fetch_reg_string			NULL
#define fetch_reg_string_size			NULL

DECLARE_BASIC_FETCH_FUNCS(stack);
#define fetch_stack_string			NULL
#define fetch_stack_string_size			NULL

DECLARE_BASIC_FETCH_FUNCS(retval);
#define fetch_retval_string			NULL
#define fetch_retval_string_size		NULL

DECLARE_BASIC_FETCH_FUNCS(memory);
DECLARE_FETCH_FUNC(memory, string);
DECLARE_FETCH_FUNC(memory, string_size);

DECLARE_BASIC_FETCH_FUNCS(symbol);
DECLARE_FETCH_FUNC(symbol, string);
DECLARE_FETCH_FUNC(symbol, string_size);

DECLARE_BASIC_FETCH_FUNCS(deref);
DECLARE_FETCH_FUNC(deref, string);
DECLARE_FETCH_FUNC(deref, string_size);

DECLARE_BASIC_FETCH_FUNCS(bitfield);
#define fetch_bitfield_string			NULL
#define fetch_bitfield_string_size		NULL

/* Default (unsigned long) fetch type */
#define __DEFAULT_FETCH_TYPE(t) u##t
#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)

#define ASSIGN_FETCH_FUNC(method, type)	\
	[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)

#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)	\
	{.name = _name,				\
	 .size = _size,					\
	 .is_signed = sign,				\
	 .print = PRINT_TYPE_FUNC_NAME(ptype),		\
	 .fmt = PRINT_TYPE_FMT_NAME(ptype),		\
	 .fmttype = _fmttype,				\
	 .fetch = {					\
ASSIGN_FETCH_FUNC(reg, ftype),				\
ASSIGN_FETCH_FUNC(stack, ftype),			\
ASSIGN_FETCH_FUNC(retval, ftype),			\
ASSIGN_FETCH_FUNC(memory, ftype),			\
ASSIGN_FETCH_FUNC(symbol, ftype),			\
ASSIGN_FETCH_FUNC(deref, ftype),			\
ASSIGN_FETCH_FUNC(bitfield, ftype),			\
	  }						\
	}

#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)

#define ASSIGN_FETCH_TYPE_END {}

#define FETCH_TYPE_STRING	0
#define FETCH_TYPE_STRSIZE	1

/*
 * Fetch type information table.
 * It's declared as a weak symbol due to conditional compilation.
 */
extern __weak const struct fetch_type kprobes_fetch_type_table[];
extern __weak const struct fetch_type uprobes_fetch_type_table[];

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 */
};

struct trace_probe {
	unsigned int			flags;	/* For TP_FLAG_* */
	struct ftrace_event_class	class;
	struct ftrace_event_call	call;
	struct list_head 		files;
	ssize_t				size;	/* trace entry size */
	unsigned int			nr_args;
	struct probe_arg		args[];
};

static inline bool trace_probe_is_enabled(struct trace_probe *tp)
{
	return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
}

static inline bool trace_probe_is_registered(struct trace_probe *tp)
{
	return !!(tp->flags & TP_FLAG_REGISTERED);
}

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**));

/* Sum up total data length for dynamic arraies (strings) */
static inline __kprobes int
__get_data_size(struct trace_probe *tp, struct pt_regs *regs)
{
	int i, ret = 0;
	u32 len;

	for (i = 0; i < tp->nr_args; i++)
		if (unlikely(tp->args[i].fetch_size.fn)) {
			call_fetch(&tp->args[i].fetch_size, regs, &len);
			ret += len;
		}

	return ret;
}

/* Store the value of each argument */
static inline __kprobes void
store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
		 u8 *data, int maxlen)
{
	int i;
	u32 end = tp->size;
	u32 *dl;	/* Data (relative) location */

	for (i = 0; i < tp->nr_args; i++) {
		if (unlikely(tp->args[i].fetch_size.fn)) {
			/*
			 * First, we set the relative location and
			 * maximum data length to *dl
			 */
			dl = (u32 *)(data + tp->args[i].offset);
			*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
			/* Then try to fetch string or dynamic array data */
			call_fetch(&tp->args[i].fetch, regs, dl);
			/* Reduce maximum length */
			end += get_rloc_len(*dl);
			maxlen -= get_rloc_len(*dl);
			/* Trick here, convert data_rloc to data_loc */
			*dl = convert_rloc_to_loc(*dl,
				 ent_size + tp->args[i].offset);
		} else
			/* Just fetching data normally */
			call_fetch(&tp->args[i].fetch, regs,
				   data + tp->args[i].offset);
	}
}

extern int set_print_fmt(struct trace_probe *tp, bool is_return);
Commit	Line	Data
8ab83f56 SD	1	/*
	2	* Common header file for probe-based Dynamic events.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	16	*
	17	* This code was copied from kernel/trace/trace_kprobe.h written by
	18	* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
	19	*
	20	* Updates to make this generic:
	21	* Copyright (C) IBM Corporation, 2010-2011
	22	* Author: Srikar Dronamraju
	23	*/
	24
	25	#include <linux/seq_file.h>
	26	#include <linux/slab.h>
	27	#include <linux/smp.h>
	28	#include <linux/debugfs.h>
	29	#include <linux/types.h>
	30	#include <linux/string.h>
	31	#include <linux/ctype.h>
	32	#include <linux/ptrace.h>
	33	#include <linux/perf_event.h>
	34	#include <linux/kprobes.h>
	35	#include <linux/stringify.h>
	36	#include <linux/limits.h>
	37	#include <linux/uaccess.h>
	38	#include <asm/bitsperlong.h>
	39
	40	#include "trace.h"
	41	#include "trace_output.h"
	42
	43	#define MAX_TRACE_ARGS 128
	44	#define MAX_ARGSTR_LEN 63
	45	#define MAX_EVENT_NAME_LEN 64
	46	#define MAX_STRING_SIZE PATH_MAX
	47
	48	/* Reserved field names */
	49	#define FIELD_STRING_IP "__probe_ip"
	50	#define FIELD_STRING_RETIP "__probe_ret_ip"
	51	#define FIELD_STRING_FUNC "__probe_func"
	52
	53	#undef DEFINE_FIELD
	54	#define DEFINE_FIELD(type, item, name, is_signed) \
	55	do { \
	56	ret = trace_define_field(event_call, #type, name, \
	57	offsetof(typeof(field), item), \
	58	sizeof(field.item), is_signed, \
	59	FILTER_OTHER); \
	60	if (ret) \
	61	return ret; \
	62	} while (0)
	63
	64
65	/* Flags for trace_probe */
66	#define TP_FLAG_TRACE 1
67	#define TP_FLAG_PROFILE 2
68	#define TP_FLAG_REGISTERED 4
69
70
71	/* data_rloc: data relative location, compatible with u32 */
72	#define make_data_rloc(len, roffs) \
73	(((u32)(len) << 16) \| ((u32)(roffs) & 0xffff))
74	#define get_rloc_len(dl) ((u32)(dl) >> 16)
75	#define get_rloc_offs(dl) ((u32)(dl) & 0xffff)
76
77	/*
78	* Convert data_rloc to data_loc:
79	* data_rloc stores the offset from data_rloc itself, but data_loc
80	* stores the offset from event entry.
81	*/
82	#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
83
b26c74e1 NK	84	static inline void get_rloc_data(u32 dl)
	85	{
	86	return (u8 )dl + get_rloc_offs(dl);
	87	}
	88
	89	/* For data_loc conversion */
	90	static inline void get_loc_data(u32 dl, void *ent)
	91	{
	92	return (u8 )ent + get_rloc_offs(dl);
	93	}
	94
8ab83f56 SD	95	/* Data fetch function type */
	96	typedef void (fetch_func_t)(struct pt_regs , void , void );
	97	/* Printing function type */
	98	typedef int (print_type_func_t)(struct trace_seq , const char , void , void *);
	99
	100	/* Fetch types */
	101	enum {
	102	FETCH_MTD_reg = 0,
	103	FETCH_MTD_stack,
	104	FETCH_MTD_retval,
	105	FETCH_MTD_memory,
	106	FETCH_MTD_symbol,
	107	FETCH_MTD_deref,
	108	FETCH_MTD_bitfield,
	109	FETCH_MTD_END,
	110	};
	111
	112	/* Fetch type information table */
	113	struct fetch_type {
	114	const char name; / Name of type */
	115	size_t size; /* Byte size of type */
	116	int is_signed; /* Signed flag */
	117	print_type_func_t print; /* Print functions */
	118	const char fmt; / Fromat string */
	119	const char fmttype; / Name in format file */
	120	/* Fetch functions */
	121	fetch_func_t fetch[FETCH_MTD_END];
	122	};
	123
	124	struct fetch_param {
	125	fetch_func_t fn;
	126	void *data;
	127	};
	128
34fee3a1 NK	129	/* For defining macros, define string/string_size types */
	130	typedef u32 string;
	131	typedef u32 string_size;
	132
b26c74e1 NK	133	#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
	134	#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
	135
	136	/* Printing in basic type function template */
	137	#define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
	138	__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
	139	const char *name, \
	140	void data, void ent); \
	141	extern const char PRINT_TYPE_FMT_NAME(type)[]
	142
	143	DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
	144	DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
	145	DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
	146	DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
	147	DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
	148	DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
	149	DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
	150	DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
	151	DECLARE_BASIC_PRINT_TYPE_FUNC(string);
	152
34fee3a1 NK	153	#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
	154
	155	/* Declare macro for basic types */
	156	#define DECLARE_FETCH_FUNC(method, type) \
	157	extern void FETCH_FUNC_NAME(method, type)(struct pt_regs *regs, \
	158	void data, void dest)
	159
	160	#define DECLARE_BASIC_FETCH_FUNCS(method) \
	161	DECLARE_FETCH_FUNC(method, u8); \
	162	DECLARE_FETCH_FUNC(method, u16); \
	163	DECLARE_FETCH_FUNC(method, u32); \
	164	DECLARE_FETCH_FUNC(method, u64)
	165
	166	DECLARE_BASIC_FETCH_FUNCS(reg);
	167	#define fetch_reg_string NULL
	168	#define fetch_reg_string_size NULL
	169
	170	DECLARE_BASIC_FETCH_FUNCS(stack);
	171	#define fetch_stack_string NULL
	172	#define fetch_stack_string_size NULL
	173
	174	DECLARE_BASIC_FETCH_FUNCS(retval);
	175	#define fetch_retval_string NULL
	176	#define fetch_retval_string_size NULL
	177
	178	DECLARE_BASIC_FETCH_FUNCS(memory);
	179	DECLARE_FETCH_FUNC(memory, string);
	180	DECLARE_FETCH_FUNC(memory, string_size);
	181
	182	DECLARE_BASIC_FETCH_FUNCS(symbol);
	183	DECLARE_FETCH_FUNC(symbol, string);
	184	DECLARE_FETCH_FUNC(symbol, string_size);
	185
	186	DECLARE_BASIC_FETCH_FUNCS(deref);
	187	DECLARE_FETCH_FUNC(deref, string);
	188	DECLARE_FETCH_FUNC(deref, string_size);
	189
	190	DECLARE_BASIC_FETCH_FUNCS(bitfield);
	191	#define fetch_bitfield_string NULL
	192	#define fetch_bitfield_string_size NULL
	193
b26c74e1 NK	194	/* Default (unsigned long) fetch type */
	195	#define __DEFAULT_FETCH_TYPE(t) u##t
	196	#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
	197	#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
	198	#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
	199
	200	#define ASSIGN_FETCH_FUNC(method, type) \
	201	[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
	202
	203	#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
	204	{.name = _name, \
	205	.size = _size, \
	206	.is_signed = sign, \
	207	.print = PRINT_TYPE_FUNC_NAME(ptype), \
	208	.fmt = PRINT_TYPE_FMT_NAME(ptype), \
	209	.fmttype = _fmttype, \
	210	.fetch = { \
	211	ASSIGN_FETCH_FUNC(reg, ftype), \
	212	ASSIGN_FETCH_FUNC(stack, ftype), \
	213	ASSIGN_FETCH_FUNC(retval, ftype), \
	214	ASSIGN_FETCH_FUNC(memory, ftype), \
	215	ASSIGN_FETCH_FUNC(symbol, ftype), \
	216	ASSIGN_FETCH_FUNC(deref, ftype), \
	217	ASSIGN_FETCH_FUNC(bitfield, ftype), \
	218	} \
	219	}
	220
	221	#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
	222	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
	223
34fee3a1 NK	224	#define ASSIGN_FETCH_TYPE_END {}
34fee3a1 NK	225
b26c74e1 NK	226	#define FETCH_TYPE_STRING 0
	227	#define FETCH_TYPE_STRSIZE 1
	228
34fee3a1 NK	229	/*
	230	* Fetch type information table.
	231	* It's declared as a weak symbol due to conditional compilation.
	232	*/
	233	extern __weak const struct fetch_type kprobes_fetch_type_table[];
	234	extern __weak const struct fetch_type uprobes_fetch_type_table[];
b26c74e1	235
8ab83f56 SD	236	struct probe_arg {
	237	struct fetch_param fetch;
	238	struct fetch_param fetch_size;
	239	unsigned int offset; /* Offset from argument entry */
	240	const char name; / Name of this argument */
	241	const char comm; / Command of this argument */
	242	const struct fetch_type type; / Type of this argument */
	243	};
	244
c31ffb3f NK	245	struct trace_probe {
	246	unsigned int flags; /* For TP_FLAG_* */
	247	struct ftrace_event_class class;
	248	struct ftrace_event_call call;
	249	struct list_head files;
	250	ssize_t size; /* trace entry size */
	251	unsigned int nr_args;
	252	struct probe_arg args[];
	253	};
	254
	255	static inline bool trace_probe_is_enabled(struct trace_probe *tp)
	256	{
	257	return !!(tp->flags & (TP_FLAG_TRACE \| TP_FLAG_PROFILE));
	258	}
	259
	260	static inline bool trace_probe_is_registered(struct trace_probe *tp)
	261	{
	262	return !!(tp->flags & TP_FLAG_REGISTERED);
	263	}
	264
8ab83f56 SD	265	static inline __kprobes void call_fetch(struct fetch_param *fprm,
	266	struct pt_regs regs, void dest)
	267	{
	268	return fprm->fn(regs, fprm->data, dest);
	269	}
	270
	271	/* Check the name is good for event/group/fields */
	272	static inline int is_good_name(const char *name)
	273	{
	274	if (!isalpha(name) && name != '_')
	275	return 0;
	276	while (*++name != '\0') {
	277	if (!isalpha(name) && !isdigit(name) && *name != '_')
	278	return 0;
	279	}
	280	return 1;
	281	}
	282
	283	extern int traceprobe_parse_probe_arg(char arg, ssize_t size,
f3f096cf	284	struct probe_arg *parg, bool is_return, bool is_kprobe);
8ab83f56 SD	285
	286	extern int traceprobe_conflict_field_name(const char *name,
	287	struct probe_arg *args, int narg);
	288
	289	extern void traceprobe_update_arg(struct probe_arg *arg);
	290	extern void traceprobe_free_probe_arg(struct probe_arg *arg);
	291
	292	extern int traceprobe_split_symbol_offset(char symbol, unsigned long offset);
	293
	294	extern ssize_t traceprobe_probes_write(struct file *file,
	295	const char __user buffer, size_t count, loff_t ppos,
	296	int (createfn)(int, char*));
	297
	298	extern int traceprobe_command(const char buf, int (createfn)(int, char**));
2dc10183 NK	299
	300	/* Sum up total data length for dynamic arraies (strings) */
	301	static inline __kprobes int
	302	__get_data_size(struct trace_probe tp, struct pt_regs regs)
	303	{
	304	int i, ret = 0;
	305	u32 len;
	306
	307	for (i = 0; i < tp->nr_args; i++)
	308	if (unlikely(tp->args[i].fetch_size.fn)) {
	309	call_fetch(&tp->args[i].fetch_size, regs, &len);
	310	ret += len;
	311	}
	312
	313	return ret;
	314	}
	315
	316	/* Store the value of each argument */
	317	static inline __kprobes void
	318	store_trace_args(int ent_size, struct trace_probe tp, struct pt_regs regs,
	319	u8 *data, int maxlen)
	320	{
	321	int i;
	322	u32 end = tp->size;
	323	u32 dl; / Data (relative) location */
	324
	325	for (i = 0; i < tp->nr_args; i++) {
	326	if (unlikely(tp->args[i].fetch_size.fn)) {
	327	/*
	328	* First, we set the relative location and
	329	* maximum data length to *dl
	330	*/
	331	dl = (u32 *)(data + tp->args[i].offset);
	332	*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
	333	/* Then try to fetch string or dynamic array data */
	334	call_fetch(&tp->args[i].fetch, regs, dl);
	335	/* Reduce maximum length */
	336	end += get_rloc_len(*dl);
	337	maxlen -= get_rloc_len(*dl);
	338	/* Trick here, convert data_rloc to data_loc */
	339	dl = convert_rloc_to_loc(dl,
	340	ent_size + tp->args[i].offset);
	341	} else
	342	/* Just fetching data normally */
	343	call_fetch(&tp->args[i].fetch, regs,
	344	data + tp->args[i].offset);
	345	}
	346	}
5bf652aa NK	347
5bf652aa NK	348	extern int set_print_fmt(struct trace_probe *tp, bool is_return);