Commit f9dd531c authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf symbols: Add kallsyms__get_symbol_start() 



The kallsyms__get_symbol_start() to get any symbol address from
kallsyms.  The existing kallsyms__get_function_start() only allows text
symbols so create this to allow data symbols too.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarIan Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230725001929.368041-1-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 4c11adff

tools/perf/util/event.c

+27 −3
Original line number Diff line number Diff line
@@ -93,7 +93,7 @@ struct process_symbol_args { 
	u64	   start;

};



static int find_symbol_cb(void *arg, const char *name, char type,

static int find_func_symbol_cb(void *arg, const char *name, char type,

			       u64 start)

{

	struct process_symbol_args *args = arg;
@@ -110,12 +110,36 @@ static int find_symbol_cb(void *arg, const char *name, char type, 
	return 1;

}



static int find_any_symbol_cb(void *arg, const char *name,

			      char type __maybe_unused, u64 start)

{

	struct process_symbol_args *args = arg;



	if (strcmp(name, args->name))

		return 0;



	args->start = start;

	return 1;

}



int kallsyms__get_function_start(const char *kallsyms_filename,

				 const char *symbol_name, u64 *addr)

{

	struct process_symbol_args args = { .name = symbol_name, };



	if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)

	if (kallsyms__parse(kallsyms_filename, &args, find_func_symbol_cb) <= 0)

		return -1;



	*addr = args.start;

	return 0;

}



int kallsyms__get_symbol_start(const char *kallsyms_filename,

			       const char *symbol_name, u64 *addr)

{

	struct process_symbol_args args = { .name = symbol_name, };



	if (kallsyms__parse(kallsyms_filename, &args, find_any_symbol_cb) <= 0)

		return -1;



	*addr = args.start;

tools/perf/util/event.h

+2 −0
Original line number Diff line number Diff line
@@ -360,6 +360,8 @@ size_t perf_event__fprintf(union perf_event *event, struct machine *machine, FIL 


int kallsyms__get_function_start(const char *kallsyms_filename,

				 const char *symbol_name, u64 *addr);

int kallsyms__get_symbol_start(const char *kallsyms_filename,

			       const char *symbol_name, u64 *addr);



void event_attr_init(struct perf_event_attr *attr);