util-linux/readprofile.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  *  readprofile.c - used to read /proc/profile
   4  *
   5  *  Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 /*
  23  * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
  24  * - added Native Language Support
  25  * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
  26  * - 64bit clean patch
  27  * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
  28  * - -M option to write profile multiplier.
  29  * 2001-11-07 Werner Almesberger <wa@almesberger.net>
  30  * - byte order auto-detection and -n option
  31  * 2001-11-09 Werner Almesberger <wa@almesberger.net>
  32  * - skip step size (index 0)
  33  * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
  34  * - make maplineno do something
  35  * 2002-11-28 Mads Martin Joergensen +
  36  * - also try /boot/System.map-`uname -r`
  37  * 2003-04-09 Werner Almesberger <wa@almesberger.net>
  38  * - fixed off-by eight error and improved heuristics in byte order detection
  39  * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
  40  * - added -s option; example of use:
  41  * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
  42  *
  43  * Taken from util-linux and adapted for busybox by
  44  * Paul Mundt <lethal@linux-sh.org>.
  45  */
  46
  47 #include <errno.h>
  48 #include <stdio.h>
  49 #include <fcntl.h>
  50 #include <stdlib.h>
  51 #include <unistd.h>
  52 #include <string.h>
  53 #include <sys/types.h>
  54 #include <sys/stat.h>
  55 #include <sys/utsname.h>
  56
  57 #include "busybox.h"
  58
  59 #define S_LEN 128
  60
  61 /* These are the defaults */
  62 static const char defaultmap[]="/boot/System.map";
  63 static const char defaultpro[]="/proc/profile";
  64
  65 int readprofile_main(int argc, char **argv)
  66 {
  67         FILE *map;
  68         int proFd;
  69         const char *mapFile, *proFile, *mult=0;
  70         unsigned long len=0, indx=1;
  71         unsigned long long add0=0;
  72         unsigned int step;
  73         unsigned int *buf, total, fn_len;
  74         unsigned long long fn_add, next_add;          /* current and next address */
  75         char fn_name[S_LEN], next_name[S_LEN];   /* current and next name */
  76         char mode[8];
  77         int c;
  78         int optAll=0, optInfo=0, optReset=0, optVerbose=0, optNative=0;
  79         int optBins=0, optSub=0;
  80         char mapline[S_LEN];
  81         int maplineno=1;
  82         int header_printed;
  83
  84 #define next (current^1)
  85
  86         proFile = defaultpro;
  87         mapFile = defaultmap;
  88
  89         while ((c = getopt(argc, argv, "M:m:np:itvarVbs")) != -1) {
  90                 switch(c) {
  91                 case 'm':
  92                         mapFile = optarg;
  93                         break;
  94                 case 'n':
  95                         optNative++;
  96                         break;
  97                 case 'p':
  98                         proFile = optarg;
  99                         break;
 100                 case 'a':
 101                         optAll++;
 102                         break;
 103                 case 'b':
 104                         optBins++;
 105                         break;
 106                 case 's':
 107                         optSub++;
 108                         break;
 109                 case 'i':
 110                         optInfo++;
 111                         break;
 112                 case 'M':
 113                         mult = optarg;
 114                         break;
 115                 case 'r':
 116                         optReset++;
 117                         break;
 118                 case 'v':
 119                         optVerbose++;
 120                         break;
 121                 default:
 122                         bb_show_usage();
 123                 }
 124         }
 125
 126         if (optReset || mult) {
 127                 int multiplier, fd, to_write;
 128
 129                 /*
 130                  * When writing the multiplier, if the length of the write is
 131                  * not sizeof(int), the multiplier is not changed
 132                  */
 133                 if (mult) {
 134                         multiplier = strtoul(mult, 0, 10);
 135                         to_write = sizeof(int);
 136                 } else {
 137                         multiplier = 0;
 138                         to_write = 1;   /* sth different from sizeof(int) */
 139                 }
 140
 141                 fd = bb_xopen(defaultpro,O_WRONLY);
 142
 143                 if (write(fd, &multiplier, to_write) != to_write)
 144                         bb_perror_msg_and_die("error writing %s", defaultpro);
 145
 146                 close(fd);
 147                 return EXIT_SUCCESS;
 148         }
 149
 150         /*
 151          * Use an fd for the profiling buffer, to skip stdio overhead
 152          */
 153
 154         proFd = bb_xopen(proFile,O_RDONLY);
 155
 156         if (((int)(len=lseek(proFd,0,SEEK_END)) < 0)
 157             || (lseek(proFd,0,SEEK_SET) < 0))
 158                 bb_perror_msg_and_die(proFile);
 159
 160         buf = xmalloc(len);
 161
 162         if (read(proFd,buf,len) != len)
 163                 bb_perror_msg_and_die(proFile);
 164
 165         close(proFd);
 166
 167         if (!optNative) {
 168                 int entries = len/sizeof(*buf);
 169                 int big = 0,small = 0,i;
 170                 unsigned *p;
 171
 172                 for (p = buf+1; p < buf+entries; p++) {
 173                         if (*p & ~0U << (sizeof(*buf)*4))
 174                                 big++;
 175                         if (*p & ((1 << (sizeof(*buf)*4))-1))
 176                                 small++;
 177                 }
 178                 if (big > small) {
 179                         bb_error_msg("Assuming reversed byte order. "
 180                                 "Use -n to force native byte order.");
 181                         for (p = buf; p < buf+entries; p++)
 182                                 for (i = 0; i < sizeof(*buf)/2; i++) {
 183                                         unsigned char *b = (unsigned char *) p;
 184                                         unsigned char tmp;
 185
 186                                         tmp = b[i];
 187                                         b[i] = b[sizeof(*buf)-i-1];
 188                                         b[sizeof(*buf)-i-1] = tmp;
 189                                 }
 190                 }
 191         }
 192
 193         step = buf[0];
 194         if (optInfo) {
 195                 printf("Sampling_step: %i\n", step);
 196                 return EXIT_SUCCESS;
 197         }
 198
 199         total = 0;
 200
 201         map = bb_xfopen(mapFile, "r");
 202
 203         while (fgets(mapline,S_LEN,map)) {
 204                 if (sscanf(mapline,"%llx %s %s",&fn_add,mode,fn_name) != 3)
 205                         bb_error_msg_and_die("%s(%i): wrong map line",
 206                                              mapFile, maplineno);
 207
 208                 if (!strcmp(fn_name,"_stext")) /* only elf works like this */ {
 209                         add0 = fn_add;
 210                         break;
 211                 }
 212                 maplineno++;
 213         }
 214
 215         if (!add0)
 216                 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
 217
 218         /*
 219          * Main loop.
 220          */
 221         while (fgets(mapline,S_LEN,map)) {
 222                 unsigned int this = 0;
 223
 224                 if (sscanf(mapline,"%llx %s %s",&next_add,mode,next_name) != 3)
 225                         bb_error_msg_and_die("%s(%i): wrong map line",
 226                                              mapFile, maplineno);
 227
 228                 header_printed = 0;
 229
 230                 /* ignore any LEADING (before a '[tT]' symbol is found)
 231                    Absolute symbols */
 232                 if ((*mode == 'A' || *mode == '?') && total == 0) continue;
 233                 if (*mode != 'T' && *mode != 't' &&
 234                     *mode != 'W' && *mode != 'w')
 235                         break;  /* only text is profiled */
 236
 237                 if (indx >= len / sizeof(*buf))
 238                         bb_error_msg_and_die("profile address out of range. "
 239                                              "Wrong map file?");
 240
 241                 while (indx < (next_add-add0)/step) {
 242                         if (optBins && (buf[indx] || optAll)) {
 243                                 if (!header_printed) {
 244                                         printf ("%s:\n", fn_name);
 245                                         header_printed = 1;
 246                                 }
 247                                 printf ("\t%llx\t%u\n", (indx - 1)*step + add0, buf[indx]);
 248                         }
 249                         this += buf[indx++];
 250                 }
 251                 total += this;
 252
 253                 if (optBins) {
 254                         if (optVerbose || this > 0)
 255                                 printf ("  total\t\t\t\t%u\n", this);
 256                 } else if ((this || optAll) &&
 257                            (fn_len = next_add-fn_add) != 0) {
 258                         if (optVerbose)
 259                                 printf("%016llx %-40s %6i %8.4f\n", fn_add,
 260                                        fn_name,this,this/(double)fn_len);
 261                         else
 262                                 printf("%6i %-40s %8.4f\n",
 263                                        this,fn_name,this/(double)fn_len);
 264                         if (optSub) {
 265                                 unsigned long long scan;
 266
 267                                 for (scan = (fn_add-add0)/step + 1;
 268                                      scan < (next_add-add0)/step; scan++) {
 269                                         unsigned long long addr;
 270
 271                                         addr = (scan - 1)*step + add0;
 272                                         printf("\t%#llx\t%s+%#llx\t%u\n",
 273                                                addr, fn_name, addr - fn_add,
 274                                                buf[scan]);
 275                                 }
 276                         }
 277                 }
 278
 279                 fn_add = next_add;
 280                 strcpy(fn_name,next_name);
 281
 282                 maplineno++;
 283         }
 284
 285         /* clock ticks, out of kernel text - probably modules */
 286         printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
 287
 288         /* trailer */
 289         if (optVerbose)
 290                 printf("%016x %-40s %6i %8.4f\n",
 291                        0,"total",total,total/(double)(fn_add-add0));
 292         else
 293                 printf("%6i %-40s %8.4f\n",
 294                        total,"total",total/(double)(fn_add-add0));
 295
 296         fclose(map);
 297         free(buf);
 298
 299         return EXIT_SUCCESS;
 300 }