1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * readprofile.c - used to read /proc/profile
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4 | *
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5 | * Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /*
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11 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL>
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12 | * - added Native Language Support
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13 | * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
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14 | * - 64bit clean patch
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15 | * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
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16 | * - -M option to write profile multiplier.
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17 | * 2001-11-07 Werner Almesberger <wa@almesberger.net>
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18 | * - byte order auto-detection and -n option
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19 | * 2001-11-09 Werner Almesberger <wa@almesberger.net>
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20 | * - skip step size (index 0)
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21 | * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
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22 | * - make maplineno do something
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23 | * 2002-11-28 Mads Martin Joergensen +
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24 | * - also try /boot/System.map-`uname -r`
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25 | * 2003-04-09 Werner Almesberger <wa@almesberger.net>
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26 | * - fixed off-by eight error and improved heuristics in byte order detection
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27 | * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
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28 | * - added -s option; example of use:
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29 | * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
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30 | *
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31 | * Taken from util-linux and adapted for busybox by
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32 | * Paul Mundt <lethal@linux-sh.org>.
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33 | */
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34 |
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35 | #include "libbb.h"
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36 | #include <sys/utsname.h>
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37 |
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38 | #define S_LEN 128
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39 |
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40 | /* These are the defaults */
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41 | static const char defaultmap[] ALIGN1 = "/boot/System.map";
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42 | static const char defaultpro[] ALIGN1 = "/proc/profile";
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43 |
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44 | int readprofile_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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45 | int readprofile_main(int argc UNUSED_PARAM, char **argv)
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46 | {
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47 | FILE *map;
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48 | const char *mapFile, *proFile;
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49 | unsigned long indx = 1;
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50 | size_t len;
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51 | uint64_t add0 = 0;
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52 | unsigned int step;
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53 | unsigned int *buf, total, fn_len;
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54 | unsigned long long fn_add, next_add; /* current and next address */
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55 | char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
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56 | char mapline[S_LEN];
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57 | char mode[8];
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58 | int maplineno = 1;
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59 | int header_printed;
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60 | int multiplier = 0;
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61 | unsigned opt;
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62 | enum {
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63 | OPT_M = (1 << 0),
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64 | OPT_m = (1 << 1),
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65 | OPT_p = (1 << 2),
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66 | OPT_n = (1 << 3),
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67 | OPT_a = (1 << 4),
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68 | OPT_b = (1 << 5),
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69 | OPT_s = (1 << 6),
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70 | OPT_i = (1 << 7),
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71 | OPT_r = (1 << 8),
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72 | OPT_v = (1 << 9),
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73 | };
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74 | #define optMult (opt & OPT_M)
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75 | #define optNative (opt & OPT_n)
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76 | #define optAll (opt & OPT_a)
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77 | #define optBins (opt & OPT_b)
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78 | #define optSub (opt & OPT_s)
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79 | #define optInfo (opt & OPT_i)
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80 | #define optReset (opt & OPT_r)
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81 | #define optVerbose (opt & OPT_v)
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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 | opt_complementary = "M+"; /* -M N */
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89 | opt = getopt32(argv, "M:m:p:nabsirv", &multiplier, &mapFile, &proFile);
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90 |
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91 | if (opt & (OPT_M|OPT_r)) { /* mult or reset, or both */
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92 | int fd, to_write;
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93 |
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94 | /*
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95 | * When writing the multiplier, if the length of the write is
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96 | * not sizeof(int), the multiplier is not changed
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97 | */
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98 | to_write = sizeof(int);
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99 | if (!optMult)
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100 | to_write = 1; /* sth different from sizeof(int) */
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101 |
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102 | fd = xopen(defaultpro, O_WRONLY);
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103 | xwrite(fd, &multiplier, to_write);
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104 | close(fd);
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105 | return EXIT_SUCCESS;
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106 | }
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107 |
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108 | /*
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109 | * Use an fd for the profiling buffer, to skip stdio overhead
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110 | */
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111 | len = MAXINT(ssize_t);
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112 | buf = xmalloc_xopen_read_close(proFile, &len);
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113 | if (!optNative) {
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114 | int entries = len / sizeof(*buf);
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115 | int big = 0, small = 0, i;
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116 | unsigned *p;
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117 |
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118 | for (p = buf+1; p < buf+entries; p++) {
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119 | if (*p & ~0U << (sizeof(*buf)*4))
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120 | big++;
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121 | if (*p & ((1 << (sizeof(*buf)*4))-1))
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122 | small++;
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123 | }
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124 | if (big > small) {
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125 | bb_error_msg("assuming reversed byte order, "
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126 | "use -n to force native byte order");
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127 | for (p = buf; p < buf+entries; p++)
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128 | for (i = 0; i < sizeof(*buf)/2; i++) {
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129 | unsigned char *b = (unsigned char *) p;
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130 | unsigned char tmp;
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131 |
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132 | tmp = b[i];
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133 | b[i] = b[sizeof(*buf)-i-1];
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134 | b[sizeof(*buf)-i-1] = tmp;
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135 | }
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136 | }
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137 | }
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138 |
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139 | step = buf[0];
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140 | if (optInfo) {
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141 | printf("Sampling_step: %i\n", step);
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142 | return EXIT_SUCCESS;
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143 | }
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144 |
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145 | total = 0;
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146 |
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147 | map = xfopen_for_read(mapFile);
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148 |
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149 | while (fgets(mapline, S_LEN, map)) {
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150 | if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
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151 | bb_error_msg_and_die("%s(%i): wrong map line",
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152 | mapFile, maplineno);
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153 |
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154 | if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
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155 | add0 = fn_add;
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156 | break;
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157 | }
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158 | maplineno++;
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159 | }
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160 |
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161 | if (!add0)
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162 | bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
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163 |
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164 | /*
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165 | * Main loop.
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166 | */
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167 | while (fgets(mapline, S_LEN, map)) {
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168 | unsigned int this = 0;
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169 |
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170 | if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
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171 | bb_error_msg_and_die("%s(%i): wrong map line",
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172 | mapFile, maplineno);
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173 |
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174 | header_printed = 0;
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175 |
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176 | /* ignore any LEADING (before a '[tT]' symbol is found)
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177 | Absolute symbols */
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178 | if ((*mode == 'A' || *mode == '?') && total == 0) continue;
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179 | if (*mode != 'T' && *mode != 't'
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180 | && *mode != 'W' && *mode != 'w'
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181 | ) {
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182 | break; /* only text is profiled */
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183 | }
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184 |
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185 | if (indx >= len / sizeof(*buf))
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186 | bb_error_msg_and_die("profile address out of range. "
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187 | "Wrong map file?");
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188 |
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189 | while (indx < (next_add-add0)/step) {
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190 | if (optBins && (buf[indx] || optAll)) {
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191 | if (!header_printed) {
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192 | printf("%s:\n", fn_name);
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193 | header_printed = 1;
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194 | }
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195 | printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
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196 | }
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197 | this += buf[indx++];
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198 | }
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199 | total += this;
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200 |
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201 | if (optBins) {
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202 | if (optVerbose || this > 0)
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203 | printf(" total\t\t\t\t%u\n", this);
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204 | } else if ((this || optAll)
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205 | && (fn_len = next_add-fn_add) != 0
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206 | ) {
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207 | if (optVerbose)
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208 | printf("%016llx %-40s %6i %8.4f\n", fn_add,
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209 | fn_name, this, this/(double)fn_len);
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210 | else
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211 | printf("%6i %-40s %8.4f\n",
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212 | this, fn_name, this/(double)fn_len);
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213 | if (optSub) {
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214 | unsigned long long scan;
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215 |
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216 | for (scan = (fn_add-add0)/step + 1;
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217 | scan < (next_add-add0)/step; scan++) {
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218 | unsigned long long addr;
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219 |
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220 | addr = (scan - 1)*step + add0;
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221 | printf("\t%#llx\t%s+%#llx\t%u\n",
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222 | addr, fn_name, addr - fn_add,
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223 | buf[scan]);
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224 | }
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225 | }
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226 | }
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227 |
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228 | fn_add = next_add;
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229 | strcpy(fn_name, next_name);
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230 |
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231 | maplineno++;
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232 | }
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233 |
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234 | /* clock ticks, out of kernel text - probably modules */
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235 | printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
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236 |
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237 | /* trailer */
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238 | if (optVerbose)
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239 | printf("%016x %-40s %6i %8.4f\n",
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240 | 0, "total", total, total/(double)(fn_add-add0));
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241 | else
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242 | printf("%6i %-40s %8.4f\n",
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243 | total, "total", total/(double)(fn_add-add0));
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244 |
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245 | fclose(map);
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246 | free(buf);
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247 |
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248 | return EXIT_SUCCESS;
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249 | }
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