[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 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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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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| 10 | /*
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[2725] | 11 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL>
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[821] | 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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[3232] | 35 | //usage:#define readprofile_trivial_usage
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| 36 | //usage: "[OPTIONS]"
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| 37 | //usage:#define readprofile_full_usage "\n\n"
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| 38 | //usage: " -m mapfile (Default: /boot/System.map)"
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| 39 | //usage: "\n -p profile (Default: /proc/profile)"
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| 40 | //usage: "\n -M NUM Set the profiling multiplier to NUM"
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| 41 | //usage: "\n -i Print only info about the sampling step"
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| 42 | //usage: "\n -v Verbose"
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| 43 | //usage: "\n -a Print all symbols, even if count is 0"
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| 44 | //usage: "\n -b Print individual histogram-bin counts"
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| 45 | //usage: "\n -s Print individual counters within functions"
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| 46 | //usage: "\n -r Reset all the counters (root only)"
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| 47 | //usage: "\n -n Disable byte order auto-detection"
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| 48 |
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[1765] | 49 | #include "libbb.h"
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[821] | 50 | #include <sys/utsname.h>
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| 51 |
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| 52 | #define S_LEN 128
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| 53 |
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| 54 | /* These are the defaults */
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[1765] | 55 | static const char defaultmap[] ALIGN1 = "/boot/System.map";
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| 56 | static const char defaultpro[] ALIGN1 = "/proc/profile";
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[821] | 57 |
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[2725] | 58 | int readprofile_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 59 | int readprofile_main(int argc UNUSED_PARAM, char **argv)
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[821] | 60 | {
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| 61 | FILE *map;
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[2725] | 62 | const char *mapFile, *proFile;
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[1765] | 63 | unsigned long indx = 1;
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| 64 | size_t len;
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| 65 | uint64_t add0 = 0;
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[821] | 66 | unsigned int step;
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| 67 | unsigned int *buf, total, fn_len;
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[1765] | 68 | unsigned long long fn_add, next_add; /* current and next address */
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[821] | 69 | char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
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[1765] | 70 | char mapline[S_LEN];
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[821] | 71 | char mode[8];
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[1765] | 72 | int maplineno = 1;
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[821] | 73 | int header_printed;
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[2725] | 74 | int multiplier = 0;
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| 75 | unsigned opt;
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| 76 | enum {
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| 77 | OPT_M = (1 << 0),
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| 78 | OPT_m = (1 << 1),
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| 79 | OPT_p = (1 << 2),
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| 80 | OPT_n = (1 << 3),
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| 81 | OPT_a = (1 << 4),
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| 82 | OPT_b = (1 << 5),
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| 83 | OPT_s = (1 << 6),
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| 84 | OPT_i = (1 << 7),
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| 85 | OPT_r = (1 << 8),
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| 86 | OPT_v = (1 << 9),
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| 87 | };
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| 88 | #define optMult (opt & OPT_M)
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| 89 | #define optNative (opt & OPT_n)
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| 90 | #define optAll (opt & OPT_a)
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| 91 | #define optBins (opt & OPT_b)
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| 92 | #define optSub (opt & OPT_s)
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| 93 | #define optInfo (opt & OPT_i)
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| 94 | #define optReset (opt & OPT_r)
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| 95 | #define optVerbose (opt & OPT_v)
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[821] | 96 |
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| 97 | #define next (current^1)
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| 98 |
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| 99 | proFile = defaultpro;
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| 100 | mapFile = defaultmap;
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| 101 |
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[2725] | 102 | opt_complementary = "M+"; /* -M N */
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| 103 | opt = getopt32(argv, "M:m:p:nabsirv", &multiplier, &mapFile, &proFile);
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[821] | 104 |
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[2725] | 105 | if (opt & (OPT_M|OPT_r)) { /* mult or reset, or both */
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| 106 | int fd, to_write;
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[821] | 107 |
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| 108 | /*
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| 109 | * When writing the multiplier, if the length of the write is
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| 110 | * not sizeof(int), the multiplier is not changed
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| 111 | */
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[2725] | 112 | to_write = sizeof(int);
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| 113 | if (!optMult)
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| 114 | to_write = 1; /* sth different from sizeof(int) */
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[821] | 115 |
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[1765] | 116 | fd = xopen(defaultpro, O_WRONLY);
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[2725] | 117 | xwrite(fd, &multiplier, to_write);
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[821] | 118 | close(fd);
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| 119 | return EXIT_SUCCESS;
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| 120 | }
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| 121 |
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| 122 | /*
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| 123 | * Use an fd for the profiling buffer, to skip stdio overhead
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| 124 | */
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[1765] | 125 | len = MAXINT(ssize_t);
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[2725] | 126 | buf = xmalloc_xopen_read_close(proFile, &len);
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[821] | 127 | if (!optNative) {
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[2725] | 128 | int entries = len / sizeof(*buf);
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[1765] | 129 | int big = 0, small = 0, i;
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[821] | 130 | unsigned *p;
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| 131 |
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| 132 | for (p = buf+1; p < buf+entries; p++) {
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| 133 | if (*p & ~0U << (sizeof(*buf)*4))
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| 134 | big++;
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| 135 | if (*p & ((1 << (sizeof(*buf)*4))-1))
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| 136 | small++;
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| 137 | }
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| 138 | if (big > small) {
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[1765] | 139 | bb_error_msg("assuming reversed byte order, "
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| 140 | "use -n to force native byte order");
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[821] | 141 | for (p = buf; p < buf+entries; p++)
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| 142 | for (i = 0; i < sizeof(*buf)/2; i++) {
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| 143 | unsigned char *b = (unsigned char *) p;
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| 144 | unsigned char tmp;
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| 145 |
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| 146 | tmp = b[i];
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| 147 | b[i] = b[sizeof(*buf)-i-1];
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| 148 | b[sizeof(*buf)-i-1] = tmp;
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| 149 | }
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| 150 | }
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| 151 | }
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| 152 |
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| 153 | step = buf[0];
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| 154 | if (optInfo) {
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| 155 | printf("Sampling_step: %i\n", step);
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| 156 | return EXIT_SUCCESS;
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| 157 | }
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| 158 |
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| 159 | total = 0;
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| 160 |
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[2725] | 161 | map = xfopen_for_read(mapFile);
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[821] | 162 |
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[1765] | 163 | while (fgets(mapline, S_LEN, map)) {
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| 164 | if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
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[821] | 165 | bb_error_msg_and_die("%s(%i): wrong map line",
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[3232] | 166 | mapFile, maplineno);
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[821] | 167 |
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[1765] | 168 | if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
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[821] | 169 | add0 = fn_add;
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| 170 | break;
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| 171 | }
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| 172 | maplineno++;
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| 173 | }
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| 174 |
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| 175 | if (!add0)
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| 176 | bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
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| 177 |
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| 178 | /*
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| 179 | * Main loop.
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| 180 | */
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[1765] | 181 | while (fgets(mapline, S_LEN, map)) {
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[821] | 182 | unsigned int this = 0;
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| 183 |
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[1765] | 184 | if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
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[821] | 185 | bb_error_msg_and_die("%s(%i): wrong map line",
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[1765] | 186 | mapFile, maplineno);
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[821] | 187 |
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| 188 | header_printed = 0;
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| 189 |
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| 190 | /* ignore any LEADING (before a '[tT]' symbol is found)
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| 191 | Absolute symbols */
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| 192 | if ((*mode == 'A' || *mode == '?') && total == 0) continue;
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[2725] | 193 | if (*mode != 'T' && *mode != 't'
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| 194 | && *mode != 'W' && *mode != 'w'
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| 195 | ) {
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| 196 | break; /* only text is profiled */
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| 197 | }
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[821] | 198 |
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| 199 | if (indx >= len / sizeof(*buf))
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| 200 | bb_error_msg_and_die("profile address out of range. "
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[3232] | 201 | "Wrong map file?");
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[821] | 202 |
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| 203 | while (indx < (next_add-add0)/step) {
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| 204 | if (optBins && (buf[indx] || optAll)) {
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| 205 | if (!header_printed) {
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[1765] | 206 | printf("%s:\n", fn_name);
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[821] | 207 | header_printed = 1;
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| 208 | }
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[1765] | 209 | printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
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[821] | 210 | }
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| 211 | this += buf[indx++];
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| 212 | }
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| 213 | total += this;
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| 214 |
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| 215 | if (optBins) {
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| 216 | if (optVerbose || this > 0)
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[1765] | 217 | printf(" total\t\t\t\t%u\n", this);
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[2725] | 218 | } else if ((this || optAll)
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| 219 | && (fn_len = next_add-fn_add) != 0
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| 220 | ) {
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[821] | 221 | if (optVerbose)
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| 222 | printf("%016llx %-40s %6i %8.4f\n", fn_add,
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[3232] | 223 | fn_name, this, this/(double)fn_len);
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[821] | 224 | else
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| 225 | printf("%6i %-40s %8.4f\n",
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[3232] | 226 | this, fn_name, this/(double)fn_len);
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[821] | 227 | if (optSub) {
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| 228 | unsigned long long scan;
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| 229 |
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| 230 | for (scan = (fn_add-add0)/step + 1;
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| 231 | scan < (next_add-add0)/step; scan++) {
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| 232 | unsigned long long addr;
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| 233 |
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| 234 | addr = (scan - 1)*step + add0;
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| 235 | printf("\t%#llx\t%s+%#llx\t%u\n",
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[3232] | 236 | addr, fn_name, addr - fn_add,
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| 237 | buf[scan]);
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[821] | 238 | }
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| 239 | }
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| 240 | }
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| 241 |
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| 242 | fn_add = next_add;
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[1765] | 243 | strcpy(fn_name, next_name);
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[821] | 244 |
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| 245 | maplineno++;
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| 246 | }
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| 247 |
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| 248 | /* clock ticks, out of kernel text - probably modules */
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| 249 | printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
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| 250 |
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| 251 | /* trailer */
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| 252 | if (optVerbose)
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| 253 | printf("%016x %-40s %6i %8.4f\n",
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[3232] | 254 | 0, "total", total, total/(double)(fn_add-add0));
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[821] | 255 | else
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| 256 | printf("%6i %-40s %8.4f\n",
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[3232] | 257 | total, "total", total/(double)(fn_add-add0));
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[821] | 258 |
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| 259 | fclose(map);
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| 260 | free(buf);
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| 261 |
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| 262 | return EXIT_SUCCESS;
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| 263 | }
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