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    Contents of /trunk/mkinitrd-magellan/busybox/util-linux/readprofile.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 6134 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 "busybox.h"
    36 #include <sys/utsname.h>
    37
    38 #define S_LEN 128
    39
    40 /* These are the defaults */
    41 static const char defaultmap[] = "/boot/System.map";
    42 static const char defaultpro[] = "/proc/profile";
    43
    44 int readprofile_main(int argc, char **argv)
    45 {
    46 FILE *map;
    47 const char *mapFile, *proFile, *mult = 0;
    48 unsigned long indx = 1;
    49 size_t len;
    50 uint64_t add0 = 0;
    51 unsigned int step;
    52 unsigned int *buf, total, fn_len;
    53 unsigned long long fn_add, next_add; /* current and next address */
    54 char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
    55 char mapline[S_LEN];
    56 char mode[8];
    57 int optAll = 0, optInfo = 0, optReset = 0;
    58 int optVerbose = 0, optNative = 0;
    59 int optBins = 0, optSub = 0;
    60 int maplineno = 1;
    61 int header_printed;
    62
    63 #define next (current^1)
    64
    65 proFile = defaultpro;
    66 mapFile = defaultmap;
    67
    68 opt_complementary = "nn:aa:bb:ss:ii:rr:vv";
    69 getopt32(argc, argv, "M:m:p:nabsirv",
    70 &mult, &mapFile, &proFile,
    71 &optNative, &optAll, &optBins, &optSub,
    72 &optInfo, &optReset, &optVerbose);
    73
    74 if (optReset || mult) {
    75 int multiplier, fd, to_write;
    76
    77 /*
    78 * When writing the multiplier, if the length of the write is
    79 * not sizeof(int), the multiplier is not changed
    80 */
    81 if (mult) {
    82 multiplier = xatoi_u(mult);
    83 to_write = sizeof(int);
    84 } else {
    85 multiplier = 0;
    86 to_write = 1; /* sth different from sizeof(int) */
    87 }
    88
    89 fd = xopen(defaultpro, O_WRONLY);
    90
    91 if (full_write(fd, &multiplier, to_write) != to_write)
    92 bb_perror_msg_and_die("error writing %s", defaultpro);
    93
    94 close(fd);
    95 return EXIT_SUCCESS;
    96 }
    97
    98 /*
    99 * Use an fd for the profiling buffer, to skip stdio overhead
    100 */
    101 len = INT_MAX;
    102 buf = xmalloc_open_read_close(proFile, &len);
    103 if (!optNative) {
    104 int entries = len/sizeof(*buf);
    105 int big = 0, small = 0, i;
    106 unsigned *p;
    107
    108 for (p = buf+1; p < buf+entries; p++) {
    109 if (*p & ~0U << (sizeof(*buf)*4))
    110 big++;
    111 if (*p & ((1 << (sizeof(*buf)*4))-1))
    112 small++;
    113 }
    114 if (big > small) {
    115 bb_error_msg("assuming reversed byte order, "
    116 "use -n to force native byte order");
    117 for (p = buf; p < buf+entries; p++)
    118 for (i = 0; i < sizeof(*buf)/2; i++) {
    119 unsigned char *b = (unsigned char *) p;
    120 unsigned char tmp;
    121
    122 tmp = b[i];
    123 b[i] = b[sizeof(*buf)-i-1];
    124 b[sizeof(*buf)-i-1] = tmp;
    125 }
    126 }
    127 }
    128
    129 step = buf[0];
    130 if (optInfo) {
    131 printf("Sampling_step: %i\n", step);
    132 return EXIT_SUCCESS;
    133 }
    134
    135 total = 0;
    136
    137 map = xfopen(mapFile, "r");
    138
    139 while (fgets(mapline, S_LEN, map)) {
    140 if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
    141 bb_error_msg_and_die("%s(%i): wrong map line",
    142 mapFile, maplineno);
    143
    144 if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
    145 add0 = fn_add;
    146 break;
    147 }
    148 maplineno++;
    149 }
    150
    151 if (!add0)
    152 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
    153
    154 /*
    155 * Main loop.
    156 */
    157 while (fgets(mapline, S_LEN, map)) {
    158 unsigned int this = 0;
    159
    160 if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
    161 bb_error_msg_and_die("%s(%i): wrong map line",
    162 mapFile, maplineno);
    163
    164 header_printed = 0;
    165
    166 /* ignore any LEADING (before a '[tT]' symbol is found)
    167 Absolute symbols */
    168 if ((*mode == 'A' || *mode == '?') && total == 0) continue;
    169 if (*mode != 'T' && *mode != 't' &&
    170 *mode != 'W' && *mode != 'w')
    171 break; /* only text is profiled */
    172
    173 if (indx >= len / sizeof(*buf))
    174 bb_error_msg_and_die("profile address out of range. "
    175 "Wrong map file?");
    176
    177 while (indx < (next_add-add0)/step) {
    178 if (optBins && (buf[indx] || optAll)) {
    179 if (!header_printed) {
    180 printf("%s:\n", fn_name);
    181 header_printed = 1;
    182 }
    183 printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
    184 }
    185 this += buf[indx++];
    186 }
    187 total += this;
    188
    189 if (optBins) {
    190 if (optVerbose || this > 0)
    191 printf(" total\t\t\t\t%u\n", this);
    192 } else if ((this || optAll) &&
    193 (fn_len = next_add-fn_add) != 0) {
    194 if (optVerbose)
    195 printf("%016llx %-40s %6i %8.4f\n", fn_add,
    196 fn_name, this, this/(double)fn_len);
    197 else
    198 printf("%6i %-40s %8.4f\n",
    199 this, fn_name, this/(double)fn_len);
    200 if (optSub) {
    201 unsigned long long scan;
    202
    203 for (scan = (fn_add-add0)/step + 1;
    204 scan < (next_add-add0)/step; scan++) {
    205 unsigned long long addr;
    206
    207 addr = (scan - 1)*step + add0;
    208 printf("\t%#llx\t%s+%#llx\t%u\n",
    209 addr, fn_name, addr - fn_add,
    210 buf[scan]);
    211 }
    212 }
    213 }
    214
    215 fn_add = next_add;
    216 strcpy(fn_name, next_name);
    217
    218 maplineno++;
    219 }
    220
    221 /* clock ticks, out of kernel text - probably modules */
    222 printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
    223
    224 /* trailer */
    225 if (optVerbose)
    226 printf("%016x %-40s %6i %8.4f\n",
    227 0, "total", total, total/(double)(fn_add-add0));
    228 else
    229 printf("%6i %-40s %8.4f\n",
    230 total, "total", total/(double)(fn_add-add0));
    231
    232 fclose(map);
    233 free(buf);
    234
    235 return EXIT_SUCCESS;
    236 }