linux-kernel - [PATCH V2 10/10] perf dlfilter: Add object_code() to perf_dlfilter

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Date:   Sun, 27 Jun 2021 16:18:18 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 10/10] 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@...el.com>
---
 tools/perf/Documentation/perf-dlfilter.txt |  5 +++-
 tools/perf/util/dlfilter.c                 | 34 ++++++++++++++++++++++
 tools/perf/util/perf_dlfilter.h            |  4 ++-
 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 *);
 };
 
 /*
-- 
2.17.1