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>

diff --git a/tools/perf/Documentation/perf-dlfilter.txt b/tools/perf/Documentation/perf-dlfilter.txt
index 6b1d9da..02842cb 100644 (file)
--- 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 e50d524..ca33fbc 100644 (file)
--- 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 f3fc92f..3eef03d 100644 (file)
--- 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 *);
 };
 
 /*