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70ed91c6ec
Support multi-buffer on uprobe-based dynamic events by
using ftrace_event_file.
This patch is based kprobe-based dynamic events multibuffer
support work initially, commited by Masami(commit 41a7dd420c
),
but revised as below:
Oleg changed the kprobe-based multibuffer design from
array-pointers of ftrace_event_file into simple list,
so this patch also change to the list design.
rcu_read_lock/unlock added into uprobe_trace_func/uretprobe_trace_func,
to synchronize with ftrace_event_file list add and delete.
Even though we allow multi-uprobes instances now,
but TP_FLAG_PROFILE/TP_FLAG_TRACE are still mutually exclusive
in probe_event_enable currently, this means we cannot allow
one user is using uprobe-tracer, and another user is using
perf-probe on same uprobe concurrently.
(Perhaps this will be fix in future, kprobe don't have this
limitation now)
Link: http://lkml.kernel.org/r/1389946120-19610-4-git-send-email-namhyung@kernel.org
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
402 lines
11 KiB
C
402 lines
11 KiB
C
/*
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* Common header file for probe-based Dynamic events.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This code was copied from kernel/trace/trace_kprobe.h written by
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* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
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*
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* Updates to make this generic:
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* Copyright (C) IBM Corporation, 2010-2011
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* Author: Srikar Dronamraju
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*/
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/debugfs.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/ptrace.h>
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#include <linux/perf_event.h>
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#include <linux/kprobes.h>
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#include <linux/stringify.h>
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#include <linux/limits.h>
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#include <linux/uaccess.h>
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#include <asm/bitsperlong.h>
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#include "trace.h"
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#include "trace_output.h"
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#define MAX_TRACE_ARGS 128
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#define MAX_ARGSTR_LEN 63
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#define MAX_EVENT_NAME_LEN 64
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#define MAX_STRING_SIZE PATH_MAX
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/* Reserved field names */
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#define FIELD_STRING_IP "__probe_ip"
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#define FIELD_STRING_RETIP "__probe_ret_ip"
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#define FIELD_STRING_FUNC "__probe_func"
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#undef DEFINE_FIELD
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#define DEFINE_FIELD(type, item, name, is_signed) \
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do { \
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ret = trace_define_field(event_call, #type, name, \
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offsetof(typeof(field), item), \
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sizeof(field.item), is_signed, \
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FILTER_OTHER); \
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if (ret) \
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return ret; \
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} while (0)
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/* Flags for trace_probe */
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#define TP_FLAG_TRACE 1
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#define TP_FLAG_PROFILE 2
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#define TP_FLAG_REGISTERED 4
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/* data_rloc: data relative location, compatible with u32 */
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#define make_data_rloc(len, roffs) \
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(((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
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#define get_rloc_len(dl) ((u32)(dl) >> 16)
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#define get_rloc_offs(dl) ((u32)(dl) & 0xffff)
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/*
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* Convert data_rloc to data_loc:
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* data_rloc stores the offset from data_rloc itself, but data_loc
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* stores the offset from event entry.
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*/
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#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
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static inline void *get_rloc_data(u32 *dl)
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{
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return (u8 *)dl + get_rloc_offs(*dl);
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}
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/* For data_loc conversion */
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static inline void *get_loc_data(u32 *dl, void *ent)
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{
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return (u8 *)ent + get_rloc_offs(*dl);
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}
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/* Data fetch function type */
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typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
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/* Printing function type */
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typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *, void *);
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/* Fetch types */
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enum {
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FETCH_MTD_reg = 0,
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FETCH_MTD_stack,
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FETCH_MTD_retval,
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FETCH_MTD_memory,
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FETCH_MTD_symbol,
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FETCH_MTD_deref,
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FETCH_MTD_bitfield,
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FETCH_MTD_file_offset,
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FETCH_MTD_END,
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};
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/* Fetch type information table */
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struct fetch_type {
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const char *name; /* Name of type */
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size_t size; /* Byte size of type */
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int is_signed; /* Signed flag */
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print_type_func_t print; /* Print functions */
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const char *fmt; /* Fromat string */
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const char *fmttype; /* Name in format file */
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/* Fetch functions */
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fetch_func_t fetch[FETCH_MTD_END];
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};
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struct fetch_param {
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fetch_func_t fn;
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void *data;
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};
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/* For defining macros, define string/string_size types */
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typedef u32 string;
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typedef u32 string_size;
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#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
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#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
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/* Printing in basic type function template */
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#define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
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__kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
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const char *name, \
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void *data, void *ent); \
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extern const char PRINT_TYPE_FMT_NAME(type)[]
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DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
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DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
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DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
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DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
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DECLARE_BASIC_PRINT_TYPE_FUNC(string);
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#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
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/* Declare macro for basic types */
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#define DECLARE_FETCH_FUNC(method, type) \
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extern void FETCH_FUNC_NAME(method, type)(struct pt_regs *regs, \
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void *data, void *dest)
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#define DECLARE_BASIC_FETCH_FUNCS(method) \
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DECLARE_FETCH_FUNC(method, u8); \
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DECLARE_FETCH_FUNC(method, u16); \
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DECLARE_FETCH_FUNC(method, u32); \
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DECLARE_FETCH_FUNC(method, u64)
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DECLARE_BASIC_FETCH_FUNCS(reg);
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#define fetch_reg_string NULL
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#define fetch_reg_string_size NULL
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DECLARE_BASIC_FETCH_FUNCS(retval);
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#define fetch_retval_string NULL
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#define fetch_retval_string_size NULL
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DECLARE_BASIC_FETCH_FUNCS(symbol);
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DECLARE_FETCH_FUNC(symbol, string);
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DECLARE_FETCH_FUNC(symbol, string_size);
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DECLARE_BASIC_FETCH_FUNCS(deref);
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DECLARE_FETCH_FUNC(deref, string);
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DECLARE_FETCH_FUNC(deref, string_size);
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DECLARE_BASIC_FETCH_FUNCS(bitfield);
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#define fetch_bitfield_string NULL
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#define fetch_bitfield_string_size NULL
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/*
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* Define macro for basic types - we don't need to define s* types, because
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* we have to care only about bitwidth at recording time.
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*/
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#define DEFINE_BASIC_FETCH_FUNCS(method) \
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DEFINE_FETCH_##method(u8) \
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DEFINE_FETCH_##method(u16) \
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DEFINE_FETCH_##method(u32) \
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DEFINE_FETCH_##method(u64)
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/* Default (unsigned long) fetch type */
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#define __DEFAULT_FETCH_TYPE(t) u##t
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#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
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#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
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#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
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#define ASSIGN_FETCH_FUNC(method, type) \
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[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
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#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
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{.name = _name, \
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.size = _size, \
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.is_signed = sign, \
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.print = PRINT_TYPE_FUNC_NAME(ptype), \
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.fmt = PRINT_TYPE_FMT_NAME(ptype), \
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.fmttype = _fmttype, \
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.fetch = { \
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ASSIGN_FETCH_FUNC(reg, ftype), \
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ASSIGN_FETCH_FUNC(stack, ftype), \
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ASSIGN_FETCH_FUNC(retval, ftype), \
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ASSIGN_FETCH_FUNC(memory, ftype), \
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ASSIGN_FETCH_FUNC(symbol, ftype), \
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ASSIGN_FETCH_FUNC(deref, ftype), \
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ASSIGN_FETCH_FUNC(bitfield, ftype), \
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ASSIGN_FETCH_FUNC(file_offset, ftype), \
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} \
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}
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#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
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__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
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#define ASSIGN_FETCH_TYPE_END {}
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#define FETCH_TYPE_STRING 0
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#define FETCH_TYPE_STRSIZE 1
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/*
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* Fetch type information table.
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* It's declared as a weak symbol due to conditional compilation.
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*/
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extern __weak const struct fetch_type kprobes_fetch_type_table[];
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extern __weak const struct fetch_type uprobes_fetch_type_table[];
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#ifdef CONFIG_KPROBE_EVENT
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struct symbol_cache;
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unsigned long update_symbol_cache(struct symbol_cache *sc);
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void free_symbol_cache(struct symbol_cache *sc);
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struct symbol_cache *alloc_symbol_cache(const char *sym, long offset);
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#else
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/* uprobes do not support symbol fetch methods */
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#define fetch_symbol_u8 NULL
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#define fetch_symbol_u16 NULL
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#define fetch_symbol_u32 NULL
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#define fetch_symbol_u64 NULL
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#define fetch_symbol_string NULL
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#define fetch_symbol_string_size NULL
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struct symbol_cache {
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};
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static inline unsigned long __used update_symbol_cache(struct symbol_cache *sc)
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{
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return 0;
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}
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static inline void __used free_symbol_cache(struct symbol_cache *sc)
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{
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}
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static inline struct symbol_cache * __used
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alloc_symbol_cache(const char *sym, long offset)
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{
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return NULL;
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}
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#endif /* CONFIG_KPROBE_EVENT */
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struct probe_arg {
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struct fetch_param fetch;
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struct fetch_param fetch_size;
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unsigned int offset; /* Offset from argument entry */
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const char *name; /* Name of this argument */
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const char *comm; /* Command of this argument */
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const struct fetch_type *type; /* Type of this argument */
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};
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struct trace_probe {
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unsigned int flags; /* For TP_FLAG_* */
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struct ftrace_event_class class;
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struct ftrace_event_call call;
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struct list_head files;
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ssize_t size; /* trace entry size */
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unsigned int nr_args;
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struct probe_arg args[];
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};
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struct event_file_link {
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struct ftrace_event_file *file;
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struct list_head list;
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};
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static inline bool trace_probe_is_enabled(struct trace_probe *tp)
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{
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return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
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}
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static inline bool trace_probe_is_registered(struct trace_probe *tp)
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{
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return !!(tp->flags & TP_FLAG_REGISTERED);
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}
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static inline __kprobes void call_fetch(struct fetch_param *fprm,
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struct pt_regs *regs, void *dest)
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{
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return fprm->fn(regs, fprm->data, dest);
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}
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/* Check the name is good for event/group/fields */
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static inline int is_good_name(const char *name)
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{
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if (!isalpha(*name) && *name != '_')
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return 0;
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while (*++name != '\0') {
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if (!isalpha(*name) && !isdigit(*name) && *name != '_')
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return 0;
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}
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return 1;
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}
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static inline struct event_file_link *
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find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
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{
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struct event_file_link *link;
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list_for_each_entry(link, &tp->files, list)
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if (link->file == file)
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return link;
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return NULL;
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}
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extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
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struct probe_arg *parg, bool is_return, bool is_kprobe);
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extern int traceprobe_conflict_field_name(const char *name,
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struct probe_arg *args, int narg);
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extern void traceprobe_update_arg(struct probe_arg *arg);
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extern void traceprobe_free_probe_arg(struct probe_arg *arg);
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extern int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset);
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extern ssize_t traceprobe_probes_write(struct file *file,
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const char __user *buffer, size_t count, loff_t *ppos,
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int (*createfn)(int, char**));
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extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));
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/* Sum up total data length for dynamic arraies (strings) */
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static inline __kprobes int
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__get_data_size(struct trace_probe *tp, struct pt_regs *regs)
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{
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int i, ret = 0;
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u32 len;
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for (i = 0; i < tp->nr_args; i++)
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if (unlikely(tp->args[i].fetch_size.fn)) {
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call_fetch(&tp->args[i].fetch_size, regs, &len);
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ret += len;
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}
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return ret;
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}
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/* Store the value of each argument */
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static inline __kprobes void
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store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
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u8 *data, int maxlen)
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{
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int i;
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u32 end = tp->size;
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u32 *dl; /* Data (relative) location */
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for (i = 0; i < tp->nr_args; i++) {
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if (unlikely(tp->args[i].fetch_size.fn)) {
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/*
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* First, we set the relative location and
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* maximum data length to *dl
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*/
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dl = (u32 *)(data + tp->args[i].offset);
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*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
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/* Then try to fetch string or dynamic array data */
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call_fetch(&tp->args[i].fetch, regs, dl);
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/* Reduce maximum length */
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end += get_rloc_len(*dl);
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maxlen -= get_rloc_len(*dl);
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/* Trick here, convert data_rloc to data_loc */
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*dl = convert_rloc_to_loc(*dl,
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ent_size + tp->args[i].offset);
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} else
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/* Just fetching data normally */
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call_fetch(&tp->args[i].fetch, regs,
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data + tp->args[i].offset);
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}
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}
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extern int set_print_fmt(struct trace_probe *tp, bool is_return);
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