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  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8  */
   9
  10 /*
  11  * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
  12  * - added Native Language Support
  13  * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
  14  * - 64bit clean patch
  15  * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
  16  * - -M option to write profile multiplier.
  17  * 2001-11-07 Werner Almesberger <wa@almesberger.net>
  18  * - byte order auto-detection and -n option
  19  * 2001-11-09 Werner Almesberger <wa@almesberger.net>
  20  * - skip step size (index 0)
  21  * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
  22  * - make maplineno do something
  23  * 2002-11-28 Mads Martin Joergensen +
  24  * - also try /boot/System.map-`uname -r`
  25  * 2003-04-09 Werner Almesberger <wa@almesberger.net>
  26  * - fixed off-by eight error and improved heuristics in byte order detection
  27  * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
  28  * - added -s option; example of use:
  29  * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
  30  *
  31  * Taken from util-linux and adapted for busybox by
  32  * Paul Mundt <lethal@linux-sh.org>.
  33  */
  34
  35 #include "libbb.h"
  36 #include <sys/utsname.h>
  37
  38 #define S_LEN 128
  39
  40 /* These are the defaults */
  41 static const char defaultmap[] ALIGN1 = "/boot/System.map";
  42 static const char defaultpro[] ALIGN1 = "/proc/profile";
  43
  44 int readprofile_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  45 int readprofile_main(int argc ATTRIBUTE_UNUSED, char **argv)
  46 {
  47         FILE *map;
  48         const char *mapFile, *proFile, *mult = 0;
  49         unsigned long indx = 1;
  50         size_t len;
  51         uint64_t add0 = 0;
  52         unsigned int step;
  53         unsigned int *buf, total, fn_len;
  54         unsigned long long fn_add, next_add;     /* current and next address */
  55         char fn_name[S_LEN], next_name[S_LEN];   /* current and next name */
  56         char mapline[S_LEN];
  57         char mode[8];
  58         int optAll = 0, optInfo = 0, optReset = 0;
  59         int optVerbose = 0, optNative = 0;
  60         int optBins = 0, optSub = 0;
  61         int maplineno = 1;
  62         int header_printed;
  63
  64 #define next (current^1)
  65
  66         proFile = defaultpro;
  67         mapFile = defaultmap;
  68
  69         opt_complementary = "nn:aa:bb:ss:ii:rr:vv";
  70         getopt32(argv, "M:m:p:nabsirv",
  71                         &mult, &mapFile, &proFile,
  72                         &optNative, &optAll, &optBins, &optSub,
  73                         &optInfo, &optReset, &optVerbose);
  74
  75         if (optReset || mult) {
  76                 int multiplier, fd, to_write;
  77
  78                 /*
  79                  * When writing the multiplier, if the length of the write is
  80                  * not sizeof(int), the multiplier is not changed
  81                  */
  82                 if (mult) {
  83                         multiplier = xatoi_u(mult);
  84                         to_write = sizeof(int);
  85                 } else {
  86                         multiplier = 0;
  87                         to_write = 1;   /* sth different from sizeof(int) */
  88                 }
  89
  90                 fd = xopen(defaultpro, O_WRONLY);
  91                 xwrite(fd, &multiplier, to_write);
  92                 close(fd);
  93                 return EXIT_SUCCESS;
  94         }
  95
  96         /*
  97          * Use an fd for the profiling buffer, to skip stdio overhead
  98          */
  99         len = MAXINT(ssize_t);
 100         buf = xmalloc_open_read_close(proFile, &len);
 101         if (!optNative) {
 102                 int entries = len/sizeof(*buf);
 103                 int big = 0, small = 0, i;
 104                 unsigned *p;
 105
 106                 for (p = buf+1; p < buf+entries; p++) {
 107                         if (*p & ~0U << (sizeof(*buf)*4))
 108                                 big++;
 109                         if (*p & ((1 << (sizeof(*buf)*4))-1))
 110                                 small++;
 111                 }
 112                 if (big > small) {
 113                         bb_error_msg("assuming reversed byte order, "
 114                                 "use -n to force native byte order");
 115                         for (p = buf; p < buf+entries; p++)
 116                                 for (i = 0; i < sizeof(*buf)/2; i++) {
 117                                         unsigned char *b = (unsigned char *) p;
 118                                         unsigned char tmp;
 119
 120                                         tmp = b[i];
 121                                         b[i] = b[sizeof(*buf)-i-1];
 122                                         b[sizeof(*buf)-i-1] = tmp;
 123                                 }
 124                 }
 125         }
 126
 127         step = buf[0];
 128         if (optInfo) {
 129                 printf("Sampling_step: %i\n", step);
 130                 return EXIT_SUCCESS;
 131         }
 132
 133         total = 0;
 134
 135         map = xfopen(mapFile, "r");
 136
 137         while (fgets(mapline, S_LEN, map)) {
 138                 if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
 139                         bb_error_msg_and_die("%s(%i): wrong map line",
 140                                              mapFile, maplineno);
 141
 142                 if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
 143                         add0 = fn_add;
 144                         break;
 145                 }
 146                 maplineno++;
 147         }
 148
 149         if (!add0)
 150                 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
 151
 152         /*
 153          * Main loop.
 154          */
 155         while (fgets(mapline, S_LEN, map)) {
 156                 unsigned int this = 0;
 157
 158                 if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
 159                         bb_error_msg_and_die("%s(%i): wrong map line",
 160                                         mapFile, maplineno);
 161
 162                 header_printed = 0;
 163
 164                 /* ignore any LEADING (before a '[tT]' symbol is found)
 165                    Absolute symbols */
 166                 if ((*mode == 'A' || *mode == '?') && total == 0) continue;
 167                 if (*mode != 'T' && *mode != 't' &&
 168                     *mode != 'W' && *mode != 'w')
 169                         break;  /* only text is profiled */
 170
 171                 if (indx >= len / sizeof(*buf))
 172                         bb_error_msg_and_die("profile address out of range. "
 173                                              "Wrong map file?");
 174
 175                 while (indx < (next_add-add0)/step) {
 176                         if (optBins && (buf[indx] || optAll)) {
 177                                 if (!header_printed) {
 178                                         printf("%s:\n", fn_name);
 179                                         header_printed = 1;
 180                                 }
 181                                 printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
 182                         }
 183                         this += buf[indx++];
 184                 }
 185                 total += this;
 186
 187                 if (optBins) {
 188                         if (optVerbose || this > 0)
 189                                 printf("  total\t\t\t\t%u\n", this);
 190                 } else if ((this || optAll) &&
 191                            (fn_len = next_add-fn_add) != 0) {
 192                         if (optVerbose)
 193                                 printf("%016llx %-40s %6i %8.4f\n", fn_add,
 194                                        fn_name, this, this/(double)fn_len);
 195                         else
 196                                 printf("%6i %-40s %8.4f\n",
 197                                        this, fn_name, this/(double)fn_len);
 198                         if (optSub) {
 199                                 unsigned long long scan;
 200
 201                                 for (scan = (fn_add-add0)/step + 1;
 202                                      scan < (next_add-add0)/step; scan++) {
 203                                         unsigned long long addr;
 204
 205                                         addr = (scan - 1)*step + add0;
 206                                         printf("\t%#llx\t%s+%#llx\t%u\n",
 207                                                addr, fn_name, addr - fn_add,
 208                                                buf[scan]);
 209                                 }
 210                         }
 211                 }
 212
 213                 fn_add = next_add;
 214                 strcpy(fn_name, next_name);
 215
 216                 maplineno++;
 217         }
 218
 219         /* clock ticks, out of kernel text - probably modules */
 220         printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
 221
 222         /* trailer */
 223         if (optVerbose)
 224                 printf("%016x %-40s %6i %8.4f\n",
 225                        0, "total", total, total/(double)(fn_add-add0));
 226         else
 227                 printf("%6i %-40s %8.4f\n",
 228                        total, "total", total/(double)(fn_add-add0));
 229
 230         fclose(map);
 231         free(buf);
 232
 233         return EXIT_SUCCESS;
 234 }