release/src/router/busybox/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 Mickiewicz <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 UNUSED_PARAM, char **argv)
  46 {
  47         FILE *map;
  48         const char *mapFile, *proFile;
  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 maplineno = 1;
  59         int header_printed;
  60         int multiplier = 0;
  61         unsigned opt;
  62         enum {
  63                 OPT_M = (1 << 0),
  64                 OPT_m = (1 << 1),
  65                 OPT_p = (1 << 2),
  66                 OPT_n = (1 << 3),
  67                 OPT_a = (1 << 4),
  68                 OPT_b = (1 << 5),
  69                 OPT_s = (1 << 6),
  70                 OPT_i = (1 << 7),
  71                 OPT_r = (1 << 8),
  72                 OPT_v = (1 << 9),
  73         };
  74 #define optMult    (opt & OPT_M)
  75 #define optNative  (opt & OPT_n)
  76 #define optAll     (opt & OPT_a)
  77 #define optBins    (opt & OPT_b)
  78 #define optSub     (opt & OPT_s)
  79 #define optInfo    (opt & OPT_i)
  80 #define optReset   (opt & OPT_r)
  81 #define optVerbose (opt & OPT_v)
  82
  83 #define next (current^1)
  84
  85         proFile = defaultpro;
  86         mapFile = defaultmap;
  87
  88         opt_complementary = "M+"; /* -M N */
  89         opt = getopt32(argv, "M:m:p:nabsirv", &multiplier, &mapFile, &proFile);
  90
  91         if (opt & (OPT_M|OPT_r)) { /* mult or reset, or both */
  92                 int fd, to_write;
  93
  94                 /*
  95                  * When writing the multiplier, if the length of the write is
  96                  * not sizeof(int), the multiplier is not changed
  97                  */
  98                 to_write = sizeof(int);
  99                 if (!optMult)
 100                         to_write = 1;   /* sth different from sizeof(int) */
 101
 102                 fd = xopen(defaultpro, O_WRONLY);
 103                 xwrite(fd, &multiplier, to_write);
 104                 close(fd);
 105                 return EXIT_SUCCESS;
 106         }
 107
 108         /*
 109          * Use an fd for the profiling buffer, to skip stdio overhead
 110          */
 111         len = MAXINT(ssize_t);
 112         buf = xmalloc_xopen_read_close(proFile, &len);
 113         if (!optNative) {
 114                 int entries = len / sizeof(*buf);
 115                 int big = 0, small = 0, i;
 116                 unsigned *p;
 117
 118                 for (p = buf+1; p < buf+entries; p++) {
 119                         if (*p & ~0U << (sizeof(*buf)*4))
 120                                 big++;
 121                         if (*p & ((1 << (sizeof(*buf)*4))-1))
 122                                 small++;
 123                 }
 124                 if (big > small) {
 125                         bb_error_msg("assuming reversed byte order, "
 126                                 "use -n to force native byte order");
 127                         for (p = buf; p < buf+entries; p++)
 128                                 for (i = 0; i < sizeof(*buf)/2; i++) {
 129                                         unsigned char *b = (unsigned char *) p;
 130                                         unsigned char tmp;
 131
 132                                         tmp = b[i];
 133                                         b[i] = b[sizeof(*buf)-i-1];
 134                                         b[sizeof(*buf)-i-1] = tmp;
 135                                 }
 136                 }
 137         }
 138
 139         step = buf[0];
 140         if (optInfo) {
 141                 printf("Sampling_step: %i\n", step);
 142                 return EXIT_SUCCESS;
 143         }
 144
 145         total = 0;
 146
 147         map = xfopen_for_read(mapFile);
 148
 149         while (fgets(mapline, S_LEN, map)) {
 150                 if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
 151                         bb_error_msg_and_die("%s(%i): wrong map line",
 152                                              mapFile, maplineno);
 153
 154                 if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
 155                         add0 = fn_add;
 156                         break;
 157                 }
 158                 maplineno++;
 159         }
 160
 161         if (!add0)
 162                 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
 163
 164         /*
 165          * Main loop.
 166          */
 167         while (fgets(mapline, S_LEN, map)) {
 168                 unsigned int this = 0;
 169
 170                 if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
 171                         bb_error_msg_and_die("%s(%i): wrong map line",
 172                                         mapFile, maplineno);
 173
 174                 header_printed = 0;
 175
 176                 /* ignore any LEADING (before a '[tT]' symbol is found)
 177                    Absolute symbols */
 178                 if ((*mode == 'A' || *mode == '?') && total == 0) continue;
 179                 if (*mode != 'T' && *mode != 't' &&
 180                     *mode != 'W' && *mode != 'w')
 181                         break;  /* only text is profiled */
 182
 183                 if (indx >= len / sizeof(*buf))
 184                         bb_error_msg_and_die("profile address out of range. "
 185                                              "Wrong map file?");
 186
 187                 while (indx < (next_add-add0)/step) {
 188                         if (optBins && (buf[indx] || optAll)) {
 189                                 if (!header_printed) {
 190                                         printf("%s:\n", fn_name);
 191                                         header_printed = 1;
 192                                 }
 193                                 printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
 194                         }
 195                         this += buf[indx++];
 196                 }
 197                 total += this;
 198
 199                 if (optBins) {
 200                         if (optVerbose || this > 0)
 201                                 printf("  total\t\t\t\t%u\n", this);
 202                 } else if ((this || optAll)
 203                         && (fn_len = next_add-fn_add) != 0
 204                 ) {
 205                         if (optVerbose)
 206                                 printf("%016llx %-40s %6i %8.4f\n", fn_add,
 207                                        fn_name, this, this/(double)fn_len);
 208                         else
 209                                 printf("%6i %-40s %8.4f\n",
 210                                        this, fn_name, this/(double)fn_len);
 211                         if (optSub) {
 212                                 unsigned long long scan;
 213
 214                                 for (scan = (fn_add-add0)/step + 1;
 215                                      scan < (next_add-add0)/step; scan++) {
 216                                         unsigned long long addr;
 217
 218                                         addr = (scan - 1)*step + add0;
 219                                         printf("\t%#llx\t%s+%#llx\t%u\n",
 220                                                addr, fn_name, addr - fn_add,
 221                                                buf[scan]);
 222                                 }
 223                         }
 224                 }
 225
 226                 fn_add = next_add;
 227                 strcpy(fn_name, next_name);
 228
 229                 maplineno++;
 230         }
 231
 232         /* clock ticks, out of kernel text - probably modules */
 233         printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
 234
 235         /* trailer */
 236         if (optVerbose)
 237                 printf("%016x %-40s %6i %8.4f\n",
 238                        0, "total", total, total/(double)(fn_add-add0));
 239         else
 240                 printf("%6i %-40s %8.4f\n",
 241                        total, "total", total/(double)(fn_add-add0));
 242
 243         fclose(map);
 244         free(buf);
 245
 246         return EXIT_SUCCESS;
 247 }