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authorAdrian Hunter <adrian.hunter@intel.com>2021-06-27 16:18:18 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-07-01 16:14:38 -0300
commitec4c00fedbf3e713776d2776e88a7e4bc61b7efc (patch)
treec6559fd01ae8a1951f55b199398a2ea010d177f1 /tools
parent6495e762522d4cf73d0b339830091799881eb025 (diff)
perf dlfilter: Add object_code() to perf_dlfilter_fns
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/Documentation/perf-dlfilter.txt5
-rw-r--r--tools/perf/util/dlfilter.c34
-rw-r--r--tools/perf/util/perf_dlfilter.h4
3 files changed, 41 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-dlfilter.txt b/tools/perf/Documentation/perf-dlfilter.txt
index 6b1d9da16feb..02842cb4cf90 100644
--- a/tools/perf/Documentation/perf-dlfilter.txt
+++ b/tools/perf/Documentation/perf-dlfilter.txt
@@ -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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tools/perf/util/dlfilter.c b/tools/perf/util/dlfilter.c
index e50d524906d6..ca33fbc5efde 100644
--- a/tools/perf/util/dlfilter.c
+++ b/tools/perf/util/dlfilter.c
@@ -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)
diff --git a/tools/perf/util/perf_dlfilter.h b/tools/perf/util/perf_dlfilter.h
index f3fc92fcb3c0..3eef03d661b4 100644
--- a/tools/perf/util/perf_dlfilter.h
+++ b/tools/perf/util/perf_dlfilter.h
@@ -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 *);
};
/*