1 | /*
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2 | * readprofile.c - used to read /proc/profile
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3 | *
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4 | * Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | */
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20 |
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21 | /*
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22 | * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
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23 | * - added Native Language Support
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24 | * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
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25 | * - 64bit clean patch
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26 | * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
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27 | * - -M option to write profile multiplier.
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28 | * 2001-11-07 Werner Almesberger <wa@almesberger.net>
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29 | * - byte order auto-detection and -n option
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30 | * 2001-11-09 Werner Almesberger <wa@almesberger.net>
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31 | * - skip step size (index 0)
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32 | * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
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33 | * - make maplineno do something
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34 | * 2002-11-28 Mads Martin Joergensen +
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35 | * - also try /boot/System.map-`uname -r`
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36 | * 2003-04-09 Werner Almesberger <wa@almesberger.net>
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37 | * - fixed off-by eight error and improved heuristics in byte order detection
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38 | * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
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39 | * - added -s option; example of use:
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40 | * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
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41 | *
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42 | * Taken from util-linux and adapted for busybox by
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43 | * Paul Mundt <lethal@linux-sh.org>.
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44 | */
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45 |
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46 | #include <errno.h>
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47 | #include <stdio.h>
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48 | #include <fcntl.h>
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49 | #include <stdlib.h>
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50 | #include <unistd.h>
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51 | #include <string.h>
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52 | #include <sys/types.h>
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53 | #include <sys/stat.h>
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54 | #include <sys/utsname.h>
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55 |
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56 | #include "busybox.h"
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57 |
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58 | #define S_LEN 128
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59 |
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60 | /* These are the defaults */
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61 | static const char defaultmap[]="/boot/System.map";
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62 | static const char defaultpro[]="/proc/profile";
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63 |
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64 | int readprofile_main(int argc, char **argv)
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65 | {
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66 | FILE *map;
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67 | int proFd;
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68 | const char *mapFile, *proFile, *mult=0;
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69 | unsigned long len=0, indx=1;
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70 | uint64_t add0=0;
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71 | unsigned int step;
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72 | unsigned int *buf, total, fn_len;
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73 | unsigned long long fn_add, next_add; /* current and next address */
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74 | char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
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75 | char mode[8];
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76 | int c;
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77 | int optAll=0, optInfo=0, optReset=0, optVerbose=0, optNative=0;
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78 | int optBins=0, optSub=0;
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79 | char mapline[S_LEN];
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80 | int maplineno=1;
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81 | int header_printed;
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82 |
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83 | #define next (current^1)
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84 |
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85 | proFile = defaultpro;
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86 | mapFile = defaultmap;
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87 |
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88 | while ((c = getopt(argc, argv, "M:m:np:itvarVbs")) != -1) {
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89 | switch(c) {
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90 | case 'm':
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91 | mapFile = optarg;
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92 | break;
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93 | case 'n':
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94 | optNative++;
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95 | break;
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96 | case 'p':
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97 | proFile = optarg;
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98 | break;
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99 | case 'a':
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100 | optAll++;
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101 | break;
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102 | case 'b':
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103 | optBins++;
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104 | break;
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105 | case 's':
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106 | optSub++;
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107 | break;
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108 | case 'i':
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109 | optInfo++;
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110 | break;
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111 | case 'M':
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112 | mult = optarg;
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113 | break;
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114 | case 'r':
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115 | optReset++;
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116 | break;
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117 | case 'v':
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118 | optVerbose++;
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119 | break;
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120 | default:
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121 | bb_show_usage();
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122 | }
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123 | }
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124 |
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125 | if (optReset || mult) {
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126 | int multiplier, fd, to_write;
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127 |
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128 | /*
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129 | * When writing the multiplier, if the length of the write is
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130 | * not sizeof(int), the multiplier is not changed
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131 | */
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132 | if (mult) {
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133 | multiplier = strtoul(mult, 0, 10);
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134 | to_write = sizeof(int);
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135 | } else {
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136 | multiplier = 0;
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137 | to_write = 1; /* sth different from sizeof(int) */
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138 | }
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139 |
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140 | fd = bb_xopen(defaultpro,O_WRONLY);
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141 |
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142 | if (write(fd, &multiplier, to_write) != to_write)
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143 | bb_perror_msg_and_die("error writing %s", defaultpro);
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144 |
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145 | close(fd);
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146 | return EXIT_SUCCESS;
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147 | }
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148 |
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149 | /*
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150 | * Use an fd for the profiling buffer, to skip stdio overhead
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151 | */
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152 |
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153 | proFd = bb_xopen(proFile,O_RDONLY);
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154 |
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155 | if (((int)(len=lseek(proFd,0,SEEK_END)) < 0)
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156 | || (lseek(proFd,0,SEEK_SET) < 0))
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157 | bb_perror_msg_and_die(proFile);
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158 |
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159 | buf = xmalloc(len);
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160 |
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161 | if (read(proFd,buf,len) != len)
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162 | bb_perror_msg_and_die(proFile);
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163 |
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164 | close(proFd);
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165 |
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166 | if (!optNative) {
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167 | int entries = len/sizeof(*buf);
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168 | int big = 0,small = 0,i;
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169 | unsigned *p;
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170 |
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171 | for (p = buf+1; p < buf+entries; p++) {
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172 | if (*p & ~0U << (sizeof(*buf)*4))
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173 | big++;
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174 | if (*p & ((1 << (sizeof(*buf)*4))-1))
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175 | small++;
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176 | }
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177 | if (big > small) {
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178 | bb_error_msg("Assuming reversed byte order. "
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179 | "Use -n to force native byte order.");
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180 | for (p = buf; p < buf+entries; p++)
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181 | for (i = 0; i < sizeof(*buf)/2; i++) {
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182 | unsigned char *b = (unsigned char *) p;
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183 | unsigned char tmp;
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184 |
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185 | tmp = b[i];
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186 | b[i] = b[sizeof(*buf)-i-1];
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187 | b[sizeof(*buf)-i-1] = tmp;
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188 | }
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189 | }
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190 | }
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191 |
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192 | step = buf[0];
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193 | if (optInfo) {
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194 | printf("Sampling_step: %i\n", step);
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195 | return EXIT_SUCCESS;
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196 | }
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197 |
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198 | total = 0;
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199 |
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200 | map = bb_xfopen(mapFile, "r");
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201 |
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202 | while (fgets(mapline,S_LEN,map)) {
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203 | if (sscanf(mapline,"%llx %s %s",&fn_add,mode,fn_name) != 3)
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204 | bb_error_msg_and_die("%s(%i): wrong map line",
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205 | mapFile, maplineno);
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206 |
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207 | if (!strcmp(fn_name,"_stext")) /* only elf works like this */ {
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208 | add0 = fn_add;
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209 | break;
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210 | }
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211 | maplineno++;
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212 | }
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213 |
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214 | if (!add0)
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215 | bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
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216 |
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217 | /*
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218 | * Main loop.
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219 | */
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220 | while (fgets(mapline,S_LEN,map)) {
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221 | unsigned int this = 0;
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222 |
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223 | if (sscanf(mapline,"%llx %s %s",&next_add,mode,next_name) != 3)
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224 | bb_error_msg_and_die("%s(%i): wrong map line",
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225 | mapFile, maplineno);
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226 |
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227 | header_printed = 0;
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228 |
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229 | /* ignore any LEADING (before a '[tT]' symbol is found)
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230 | Absolute symbols */
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231 | if ((*mode == 'A' || *mode == '?') && total == 0) continue;
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232 | if (*mode != 'T' && *mode != 't' &&
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233 | *mode != 'W' && *mode != 'w')
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234 | break; /* only text is profiled */
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235 |
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236 | if (indx >= len / sizeof(*buf))
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237 | bb_error_msg_and_die("profile address out of range. "
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238 | "Wrong map file?");
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239 |
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240 | while (indx < (next_add-add0)/step) {
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241 | if (optBins && (buf[indx] || optAll)) {
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242 | if (!header_printed) {
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243 | printf ("%s:\n", fn_name);
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244 | header_printed = 1;
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245 | }
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246 | printf ("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
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247 | }
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248 | this += buf[indx++];
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249 | }
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250 | total += this;
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251 |
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252 | if (optBins) {
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253 | if (optVerbose || this > 0)
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254 | printf (" total\t\t\t\t%u\n", this);
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255 | } else if ((this || optAll) &&
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256 | (fn_len = next_add-fn_add) != 0) {
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257 | if (optVerbose)
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258 | printf("%016llx %-40s %6i %8.4f\n", fn_add,
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259 | fn_name,this,this/(double)fn_len);
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260 | else
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261 | printf("%6i %-40s %8.4f\n",
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262 | this,fn_name,this/(double)fn_len);
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263 | if (optSub) {
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264 | unsigned long long scan;
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265 |
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266 | for (scan = (fn_add-add0)/step + 1;
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267 | scan < (next_add-add0)/step; scan++) {
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268 | unsigned long long addr;
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269 |
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270 | addr = (scan - 1)*step + add0;
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271 | printf("\t%#llx\t%s+%#llx\t%u\n",
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272 | addr, fn_name, addr - fn_add,
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273 | buf[scan]);
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274 | }
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275 | }
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276 | }
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277 |
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278 | fn_add = next_add;
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279 | strcpy(fn_name,next_name);
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280 |
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281 | maplineno++;
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282 | }
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283 |
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284 | /* clock ticks, out of kernel text - probably modules */
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285 | printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
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286 |
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287 | /* trailer */
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288 | if (optVerbose)
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289 | printf("%016x %-40s %6i %8.4f\n",
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290 | 0,"total",total,total/(double)(fn_add-add0));
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291 | else
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292 | printf("%6i %-40s %8.4f\n",
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293 | total,"total",total/(double)(fn_add-add0));
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294 |
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295 | fclose(map);
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296 | free(buf);
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297 |
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298 | return EXIT_SUCCESS;
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299 | }
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