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Its similar to doing grep on a /proc/kallsyms, but it also shows extra information like the path to the kernel module and the unrelocated addresses in it, to help in diagnosing problems. It is also helps demonstrate the use of the symbols routines so that tool writers can use them more effectively. Using it: $ perf kallsyms e1000_xmit_frame netif_rx usb_stor_set_xfer_buf e1000_xmit_frame: [e1000e] /lib/modules/4.9.0+/kernel/drivers/net/ethernet/intel/e1000e/e1000e.ko 0xffffffffc046fc10-0xffffffffc0470bb0 (0x19c80-0x1ac20) netif_rx: [kernel] [kernel.kallsyms] 0xffffffff916f03a0-0xffffffff916f0410 (0xffffffff916f03a0-0xffffffff916f0410) usb_stor_set_xfer_buf: [usb_storage] /lib/modules/4.9.0+/kernel/drivers/usb/storage/usb-storage.ko 0xffffffffc057aea0-0xffffffffc057af19 (0xf10-0xf89) $ Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-79bk9pakujn4l4vq0f90klv3@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
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* builtin-kallsyms.c
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*
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* Builtin command: Look for a symbol in the running kernel and its modules
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*
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* Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include "builtin.h"
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#include <linux/compiler.h>
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#include <subcmd/parse-options.h>
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#include "debug.h"
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#include "machine.h"
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#include "symbol.h"
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static int __cmd_kallsyms(int argc, const char **argv)
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{
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int i;
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struct machine *machine = machine__new_kallsyms();
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if (machine == NULL) {
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pr_err("Couldn't read /proc/kallsyms\n");
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return -1;
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}
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for (i = 0; i < argc; ++i) {
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struct map *map;
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struct symbol *symbol = machine__find_kernel_function_by_name(machine, argv[i], &map);
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if (symbol == NULL) {
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printf("%s: not found\n", argv[i]);
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continue;
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}
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printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
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symbol->name, map->dso->short_name, map->dso->long_name,
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map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end),
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symbol->start, symbol->end);
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}
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machine__delete(machine);
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return 0;
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}
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int cmd_kallsyms(int argc, const char **argv, const char *prefix __maybe_unused)
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{
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const struct option options[] = {
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OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
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OPT_END()
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};
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const char * const kallsyms_usage[] = {
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"perf kallsyms [<options>] symbol_name",
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NULL
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};
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argc = parse_options(argc, argv, options, kallsyms_usage, 0);
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if (argc < 1)
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usage_with_options(kallsyms_usage, options);
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symbol_conf.sort_by_name = true;
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symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
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if (symbol__init(NULL) < 0)
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return -1;
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return __cmd_kallsyms(argc, argv);
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}
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