builtin-kallsyms.c

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/*
 * 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>
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */
#include <inttypes.h>
#include "builtin.h"
#include <linux/compiler.h>
#include <subcmd/parse-options.h>
#include "debug.h"
#include "machine.h"
#include "symbol.h"

static int __cmd_kallsyms(int argc, const char **argv)
{
    int i;
    struct machine *machine = machine__new_kallsyms();

    if (machine == NULL) {
        pr_err("Couldn't read /proc/kallsyms\n");
        return -1;
    }

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

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

        printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
            symbol->name, map->dso->short_name, map->dso->long_name,
            map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end),
            symbol->start, symbol->end);
    }

    machine__delete(machine);
    return 0;
}

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

    return __cmd_kallsyms(argc, argv);
}