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perf dlfilter: Add object_code() to perf_dlfilter_fns

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Add a function, for use by dlfilters, to read object code.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2021-06-27 16:18:18 +03:00 committed by Arnaldo Carvalho de Melo
parent 6495e76252
commit ec4c00fedb
3 changed files with 41 additions and 2 deletions
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5
tools/perf/Documentation/perf-dlfilter.txt
View file

@ -127,7 +127,8 @@ struct perf_dlfilter_fns {
const __u8 *(*insn)(void *ctx, __u32 *length);
const char *(*srcline)(void *ctx, __u32 *line_number);
struct perf_event_attr *(*attr)(void *ctx);
void *(*reserved[121])(void *);
__s32 (*object_code)(void *ctx, __u64 ip, void *buf, __u32 len);
void *(*reserved[120])(void *);
};
----
@ -146,6 +147,8 @@ before calling. Returns 0 on success, -1 otherwise.
'attr' returns perf_event_attr, refer <linux/perf_event.h>.
'object_code' reads object code and returns the number of bytes read.
The perf_dlfilter_al structure
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

34
tools/perf/util/dlfilter.c
View file

@ -245,6 +245,39 @@ static struct perf_event_attr *dlfilter__attr(void *ctx)
return &d->evsel->core.attr;
}
static __s32 dlfilter__object_code(void *ctx, __u64 ip, void *buf, __u32 len)
{
struct dlfilter *d = (struct dlfilter *)ctx;
struct addr_location *al;
struct addr_location a;
struct map *map;
u64 offset;
if (!d->ctx_valid)
return -1;
al = get_al(d);
if (!al)
return -1;
map = al->map;
if (map && ip >= map->start && ip < map->end &&
machine__kernel_ip(d->machine, ip) == machine__kernel_ip(d->machine, d->sample->ip))
goto have_map;
thread__find_map_fb(al->thread, d->sample->cpumode, ip, &a);
if (!a.map)
return -1;
map = a.map;
have_map:
offset = map->map_ip(map, ip);
if (ip + len >= map->end)
len = map->end - ip;
return dso__data_read_offset(map->dso, d->machine, offset, buf, len);
}
static const struct perf_dlfilter_fns perf_dlfilter_fns = {
.resolve_ip = dlfilter__resolve_ip,
.resolve_addr = dlfilter__resolve_addr,
@ -253,6 +286,7 @@ static const struct perf_dlfilter_fns perf_dlfilter_fns = {
.insn = dlfilter__insn,
.srcline = dlfilter__srcline,
.attr = dlfilter__attr,
.object_code = dlfilter__object_code,
};
static char *find_dlfilter(const char *file)

4
tools/perf/util/perf_dlfilter.h
View file

@ -103,8 +103,10 @@ struct perf_dlfilter_fns {
const char *(*srcline)(void *ctx, __u32 *line_number);
/* Return perf_event_attr, refer <linux/perf_event.h> */
struct perf_event_attr *(*attr)(void *ctx);
/* Read object code, return numbers of bytes read */
__s32 (*object_code)(void *ctx, __u64 ip, void *buf, __u32 len);
/* Reserved */
void *(*reserved[121])(void *);
void *(*reserved[120])(void *);
};
/*