mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-13 05:54:23 +08:00
2b394bc446
Do not access kallsyms to show available variables and show source lines
in user binaries.
This behavior always requires the root privilege when sysctl sets
kernel.kptr_restrict=1, but we don't need it just for analyzing user
binaries.
Without this patch (by normal user, kptr_restrict=1):
----
$ perf probe -x ./perf -V add_cmdname
Failed to init vmlinux path.
Error: Failed to show vars.
$ perf probe -x ./perf -L add_cmdname
Failed to init vmlinux path.
Error: Failed to show lines.
----
With this patch:
----
$ perf probe -x ./perf -V add_cmdname
Available variables at add_cmdname
@<perf_unknown_cmd_config+144>
(No matched variables)
@<list_commands_in_dir+160>
(No matched variables)
@<add_cmdname+0>
char* name
size_t len
struct cmdnames* cmds
$ perf probe -x ./perf -L add_cmdname
<add_cmdname@/home/fedora/ksrc/linux-3/tools/perf/util/help.c:0>
0 void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
1 {
2 struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
4 ent->len = len;
5 memcpy(ent->name, name, len);
6 ent->name[len] = 0;
...
----
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: david lerner <dlernerdroid@gmail.com>
Cc: linux-perf-user@vger.kernel.org
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20140917084054.3722.73975.stgit@kbuild-f20.novalocal
[ Added missing 'bool user' argument to the !DWARF show_line_range() stub ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
#ifndef _PROBE_EVENT_H
|
|
#define _PROBE_EVENT_H
|
|
|
|
#include <stdbool.h>
|
|
#include "intlist.h"
|
|
#include "strlist.h"
|
|
#include "strfilter.h"
|
|
|
|
extern bool probe_event_dry_run;
|
|
|
|
/* kprobe-tracer and uprobe-tracer tracing point */
|
|
struct probe_trace_point {
|
|
char *symbol; /* Base symbol */
|
|
char *module; /* Module name */
|
|
unsigned long offset; /* Offset from symbol */
|
|
unsigned long address; /* Actual address of the trace point */
|
|
bool retprobe; /* Return probe flag */
|
|
};
|
|
|
|
/* probe-tracer tracing argument referencing offset */
|
|
struct probe_trace_arg_ref {
|
|
struct probe_trace_arg_ref *next; /* Next reference */
|
|
long offset; /* Offset value */
|
|
};
|
|
|
|
/* kprobe-tracer and uprobe-tracer tracing argument */
|
|
struct probe_trace_arg {
|
|
char *name; /* Argument name */
|
|
char *value; /* Base value */
|
|
char *type; /* Type name */
|
|
struct probe_trace_arg_ref *ref; /* Referencing offset */
|
|
};
|
|
|
|
/* kprobe-tracer and uprobe-tracer tracing event (point + arg) */
|
|
struct probe_trace_event {
|
|
char *event; /* Event name */
|
|
char *group; /* Group name */
|
|
struct probe_trace_point point; /* Trace point */
|
|
int nargs; /* Number of args */
|
|
bool uprobes; /* uprobes only */
|
|
struct probe_trace_arg *args; /* Arguments */
|
|
};
|
|
|
|
/* Perf probe probing point */
|
|
struct perf_probe_point {
|
|
char *file; /* File path */
|
|
char *function; /* Function name */
|
|
int line; /* Line number */
|
|
bool retprobe; /* Return probe flag */
|
|
char *lazy_line; /* Lazy matching pattern */
|
|
unsigned long offset; /* Offset from function entry */
|
|
};
|
|
|
|
/* Perf probe probing argument field chain */
|
|
struct perf_probe_arg_field {
|
|
struct perf_probe_arg_field *next; /* Next field */
|
|
char *name; /* Name of the field */
|
|
long index; /* Array index number */
|
|
bool ref; /* Referencing flag */
|
|
};
|
|
|
|
/* Perf probe probing argument */
|
|
struct perf_probe_arg {
|
|
char *name; /* Argument name */
|
|
char *var; /* Variable name */
|
|
char *type; /* Type name */
|
|
struct perf_probe_arg_field *field; /* Structure fields */
|
|
};
|
|
|
|
/* Perf probe probing event (point + arg) */
|
|
struct perf_probe_event {
|
|
char *event; /* Event name */
|
|
char *group; /* Group name */
|
|
struct perf_probe_point point; /* Probe point */
|
|
int nargs; /* Number of arguments */
|
|
bool uprobes;
|
|
struct perf_probe_arg *args; /* Arguments */
|
|
};
|
|
|
|
/* Line range */
|
|
struct line_range {
|
|
char *file; /* File name */
|
|
char *function; /* Function name */
|
|
int start; /* Start line number */
|
|
int end; /* End line number */
|
|
int offset; /* Start line offset */
|
|
char *path; /* Real path name */
|
|
char *comp_dir; /* Compile directory */
|
|
struct intlist *line_list; /* Visible lines */
|
|
};
|
|
|
|
/* List of variables */
|
|
struct variable_list {
|
|
struct probe_trace_point point; /* Actual probepoint */
|
|
struct strlist *vars; /* Available variables */
|
|
};
|
|
|
|
/* Command string to events */
|
|
extern int parse_perf_probe_command(const char *cmd,
|
|
struct perf_probe_event *pev);
|
|
|
|
/* Events to command string */
|
|
extern char *synthesize_perf_probe_command(struct perf_probe_event *pev);
|
|
extern char *synthesize_probe_trace_command(struct probe_trace_event *tev);
|
|
extern int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf,
|
|
size_t len);
|
|
|
|
/* Check the perf_probe_event needs debuginfo */
|
|
extern bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
|
|
|
|
/* Release event contents */
|
|
extern void clear_perf_probe_event(struct perf_probe_event *pev);
|
|
|
|
/* Command string to line-range */
|
|
extern int parse_line_range_desc(const char *cmd, struct line_range *lr);
|
|
|
|
/* Release line range members */
|
|
extern void line_range__clear(struct line_range *lr);
|
|
|
|
/* Initialize line range */
|
|
extern int line_range__init(struct line_range *lr);
|
|
|
|
/* Internal use: Return kernel/module path */
|
|
extern const char *kernel_get_module_path(const char *module);
|
|
|
|
extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
|
|
int max_probe_points, const char *module,
|
|
bool force_add);
|
|
extern int del_perf_probe_events(struct strlist *dellist);
|
|
extern int show_perf_probe_events(void);
|
|
extern int show_line_range(struct line_range *lr, const char *module,
|
|
bool user);
|
|
extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
|
|
int max_probe_points, const char *module,
|
|
struct strfilter *filter, bool externs);
|
|
extern int show_available_funcs(const char *module, struct strfilter *filter,
|
|
bool user);
|
|
|
|
/* Maximum index number of event-name postfix */
|
|
#define MAX_EVENT_INDEX 1024
|
|
|
|
#endif /*_PROBE_EVENT_H */
|