[PATCH 5/5] tools/perf: Add __rel_loc support

From: Masami Hiramatsu
Date: Mon Nov 15 2021 - 05:21:06 EST


Add new __rel_loc dynamic data location attribute support.
This type attribute is similar to the __data_loc but records
the offset from the field itself.
The libtraceevent adds TEP_FIELD_IS_REL_DYNAMIC to the
field->flags with TEP_FIELD_IS_DYNAMIC for __rel_loc.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
tools/perf/builtin-trace.c | 2 ++
tools/perf/util/data-convert-bt.c | 2 ++
tools/perf/util/evsel.c | 2 ++
tools/perf/util/python.c | 2 ++
.../perf/util/scripting-engines/trace-event-perl.c | 2 ++
.../util/scripting-engines/trace-event-python.c | 2 ++
tools/perf/util/sort.c | 2 ++
7 files changed, 14 insertions(+)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 2bf21194c7b3..79f76eea0fcc 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2722,6 +2722,8 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel,
offset = format_field__intval(field, sample, evsel->needs_swap);
syscall_arg.len = offset >> 16;
offset &= 0xffff;
+ if (field->flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += field->offset + field->size;
}

val = (uintptr_t)(sample->raw_data + offset);
diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
index aa862a26d95c..4406f82abb64 100644
--- a/tools/perf/util/data-convert-bt.c
+++ b/tools/perf/util/data-convert-bt.c
@@ -318,6 +318,8 @@ static int add_tracepoint_field_value(struct ctf_writer *cw,
offset = tmp_val;
len = offset >> 16;
offset &= 0xffff;
+ if (flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += fmtf->offset + fmtf->size;
}

if (flags & TEP_FIELD_IS_ARRAY) {
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index dbfeceb2546c..0dca46cf41a8 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2597,6 +2597,8 @@ void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char
if (field->flags & TEP_FIELD_IS_DYNAMIC) {
offset = *(int *)(sample->raw_data + field->offset);
offset &= 0xffff;
+ if (field->flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += field->offset + field->size;
}

return sample->raw_data + offset;
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 8feef3a05af7..f0dea973b395 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -416,6 +416,8 @@ tracepoint_field(struct pyrf_event *pe, struct tep_format_field *field)
offset = val;
len = offset >> 16;
offset &= 0xffff;
+ if (field->flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += field->offset + field->size;
}
if (field->flags & TEP_FIELD_IS_STRING &&
is_printable_array(data + offset, len)) {
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index 32a721b3e9a5..c535ed3b224e 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -392,6 +392,8 @@ static void perl_process_tracepoint(struct perf_sample *sample,
if (field->flags & TEP_FIELD_IS_DYNAMIC) {
offset = *(int *)(data + field->offset);
offset &= 0xffff;
+ if (field->flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += field->offset + field->size;
} else
offset = field->offset;
XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index c0c010350bc2..46344446f61c 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -942,6 +942,8 @@ static void python_process_tracepoint(struct perf_sample *sample,
offset = val;
len = offset >> 16;
offset &= 0xffff;
+ if (field->flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += field->offset + field->size;
}
if (field->flags & TEP_FIELD_IS_STRING &&
is_printable_array(data + offset, len)) {
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 568a88c001c6..cffe2c484923 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2385,6 +2385,8 @@ static int64_t __sort__hde_cmp(struct perf_hpp_fmt *fmt,
tep_read_number_field(field, a->raw_data, &dyn);
offset = dyn & 0xffff;
size = (dyn >> 16) & 0xffff;
+ if (field->flags & TEP_FIELD_IS_REL_DYNAMIC)
+ offset += field->offset + field->size;

/* record max width for output */
if (size > hde->dynamic_len)