162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
/*
|
|
* 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
|
|
#define TP_FLAG_UPROBE 8
|
|
|
|
|
|
/* 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**));
|