/*
   * 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
  ");
  		return -1;
  	}
  
  	for (i = 0; i < argc; ++i) {
  		struct map *map;
  		struct symbol *symbol = machine__find_kernel_function_by_name(machine, argv[i], &map);
  
  		if (symbol == NULL) {
  			printf("%s: not found
  ", argv[i]);
  			continue;
  		}
  
  		printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")
  ",
  			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);
  }