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, 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
  92                 if (full_write(fd, &multiplier, to_write) != to_write)
  93                         bb_perror_msg_and_die("error writing %s", defaultpro);
  94
  95                 close(fd);
  96                 return EXIT_SUCCESS;
  97         }
  98
  99         /*
 100          * Use an fd for the profiling buffer, to skip stdio overhead
 101          */
 102         len = MAXINT(ssize_t);
 103         buf = xmalloc_open_read_close(proFile, &len);
 104         if (!optNative) {
 105                 int entries = len/sizeof(*buf);
 106                 int big = 0, small = 0, i;
 107                 unsigned *p;
 108
 109                 for (p = buf+1; p < buf+entries; p++) {
 110                         if (*p & ~0U << (sizeof(*buf)*4))
 111                                 big++;
 112                         if (*p & ((1 << (sizeof(*buf)*4))-1))
 113                                 small++;
 114                 }
 115                 if (big > small) {
 116                         bb_error_msg("assuming reversed byte order, "
 117                                 "use -n to force native byte order");
 118                         for (p = buf; p < buf+entries; p++)
 119                                 for (i = 0; i < sizeof(*buf)/2; i++) {
 120                                         unsigned char *b = (unsigned char *) p;
 121                                         unsigned char tmp;
 122
 123                                         tmp = b[i];
 124                                         b[i] = b[sizeof(*buf)-i-1];
 125                                         b[sizeof(*buf)-i-1] = tmp;
 126                                 }
 127                 }
 128         }
 129
 130         step = buf[0];
 131         if (optInfo) {
 132                 printf("Sampling_step: %i\n", step);
 133                 return EXIT_SUCCESS;
 134         }
 135
 136         total = 0;
 137
 138         map = xfopen(mapFile, "r");
 139
 140         while (fgets(mapline, S_LEN, map)) {
 141                 if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
 142                         bb_error_msg_and_die("%s(%i): wrong map line",
 143                                              mapFile, maplineno);
 144
 145                 if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
 146                         add0 = fn_add;
 147                         break;
 148                 }
 149                 maplineno++;
 150         }
 151
 152         if (!add0)
 153                 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
 154
 155         /*
 156          * Main loop.
 157          */
 158         while (fgets(mapline, S_LEN, map)) {
 159                 unsigned int this = 0;
 160
 161                 if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
 162                         bb_error_msg_and_die("%s(%i): wrong map line",
 163                                         mapFile, maplineno);
 164
 165                 header_printed = 0;
 166
 167                 /* ignore any LEADING (before a '[tT]' symbol is found)
 168                    Absolute symbols */
 169                 if ((*mode == 'A' || *mode == '?') && total == 0) continue;
 170                 if (*mode != 'T' && *mode != 't' &&
 171                     *mode != 'W' && *mode != 'w')
 172                         break;  /* only text is profiled */
 173
 174                 if (indx >= len / sizeof(*buf))
 175                         bb_error_msg_and_die("profile address out of range. "
 176                                              "Wrong map file?");
 177
 178                 while (indx < (next_add-add0)/step) {
 179                         if (optBins && (buf[indx] || optAll)) {
 180                                 if (!header_printed) {
 181                                         printf("%s:\n", fn_name);
 182                                         header_printed = 1;
 183                                 }
 184                                 printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
 185                         }
 186                         this += buf[indx++];
 187                 }
 188                 total += this;
 189
 190                 if (optBins) {
 191                         if (optVerbose || this > 0)
 192                                 printf("  total\t\t\t\t%u\n", this);
 193                 } else if ((this || optAll) &&
 194                            (fn_len = next_add-fn_add) != 0) {
 195                         if (optVerbose)
 196                                 printf("%016llx %-40s %6i %8.4f\n", fn_add,
 197                                        fn_name, this, this/(double)fn_len);
 198                         else
 199                                 printf("%6i %-40s %8.4f\n",
 200                                        this, fn_name, this/(double)fn_len);
 201                         if (optSub) {
 202                                 unsigned long long scan;
 203
 204                                 for (scan = (fn_add-add0)/step + 1;
 205                                      scan < (next_add-add0)/step; scan++) {
 206                                         unsigned long long addr;
 207
 208                                         addr = (scan - 1)*step + add0;
 209                                         printf("\t%#llx\t%s+%#llx\t%u\n",
 210                                                addr, fn_name, addr - fn_add,
 211                                                buf[scan]);
 212                                 }
 213                         }
 214                 }
 215
 216                 fn_add = next_add;
 217                 strcpy(fn_name, next_name);
 218
 219                 maplineno++;
 220         }
 221
 222         /* clock ticks, out of kernel text - probably modules */
 223         printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
 224
 225         /* trailer */
 226         if (optVerbose)
 227                 printf("%016x %-40s %6i %8.4f\n",
 228                        0, "total", total, total/(double)(fn_add-add0));
 229         else
 230                 printf("%6i %-40s %8.4f\n",
 231                        total, "total", total/(double)(fn_add-add0));
 232
 233         fclose(map);
 234         free(buf);
 235
 236         return EXIT_SUCCESS;
 237 }