// SPDX-License-Identifier: GPL-2.0-only
/*
 * builtin-kallsyms.c
 *
 * Builtin command: Look for a symbol in the running kernel and its modules
 *
 * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 */
#include <inttypes.h>
#include "builtin.h"
#include <linux/compiler.h>
#include <subcmd/parse-options.h>
#include "debug.h"
#include "dso.h"
#include "env.h"
#include "machine.h"
#include "map.h"
#include "symbol.h"

static int __cmd_kallsyms(int argc, const char **argv)
{
        int i, err;
        struct perf_env host_env;
        struct machine *machine = NULL;


        perf_env__init(&host_env);
        err = perf_env__set_cmdline(&host_env, argc, argv);
        if (err)
                goto out;

        machine = machine__new_kallsyms(&host_env);
        if (machine == NULL) {
                pr_err("Couldn't read /proc/kallsyms\n");
                err = -1;
                goto out;
        }

        for (i = 0; i < argc; ++i) {
                struct map *map;
                const struct dso *dso;
                struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map);

                if (symbol == NULL) {
                        printf("%s: not found\n", argv[i]);
                        continue;
                }

                dso = map__dso(map);
                printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
                        symbol->name, dso__short_name(dso), dso__long_name(dso),
                        map__unmap_ip(map, symbol->start), map__unmap_ip(map, symbol->end),
                        symbol->start, symbol->end);
        }
out:
        machine__delete(machine);
        perf_env__exit(&host_env);
        return err;
}

int cmd_kallsyms(int argc, const char **argv)
{
        const struct option options[] = {
        OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
        OPT_END()
        };
        const char * const kallsyms_usage[] = {
                "perf kallsyms [<options>] symbol_name",
                NULL
        };

        argc = parse_options(argc, argv, options, kallsyms_usage, 0);
        if (argc < 1)
                usage_with_options(kallsyms_usage, options);

        symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
        if (symbol__init(NULL) < 0)
                return -1;

        return __cmd_kallsyms(argc, argv);
}