[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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[1765] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 8 | */
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| 9 |
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| 10 | /*
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| 11 | * 1999-02-22 Arkadiusz Mi¶kiewicz <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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[1765] | 35 | #include "libbb.h"
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[821] | 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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[1765] | 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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[821] | 43 |
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[1765] | 44 | int readprofile_main(int argc, char **argv);
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[821] | 45 | int readprofile_main(int argc, char **argv)
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| 46 | {
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| 47 | FILE *map;
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[1765] | 48 | const char *mapFile, *proFile, *mult = 0;
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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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[821] | 52 | unsigned int step;
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| 53 | unsigned int *buf, total, fn_len;
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[1765] | 54 | unsigned long long fn_add, next_add; /* current and next address */
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[821] | 55 | char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
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[1765] | 56 | char mapline[S_LEN];
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[821] | 57 | char mode[8];
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[1765] | 58 | int optAll = 0, optInfo = 0, optReset = 0;
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| 59 | int optVerbose = 0, optNative = 0;
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| 60 | int optBins = 0, optSub = 0;
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| 61 | int maplineno = 1;
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[821] | 62 | int header_printed;
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| 63 |
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| 64 | #define next (current^1)
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| 65 |
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| 66 | proFile = defaultpro;
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| 67 | mapFile = defaultmap;
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| 68 |
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[1765] | 69 | opt_complementary = "nn:aa:bb:ss:ii:rr:vv";
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| 70 | getopt32(argv, "M:m:p:nabsirv",
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| 71 | &mult, &mapFile, &proFile,
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| 72 | &optNative, &optAll, &optBins, &optSub,
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| 73 | &optInfo, &optReset, &optVerbose);
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[821] | 74 |
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| 75 | if (optReset || mult) {
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| 76 | int multiplier, fd, to_write;
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| 77 |
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| 78 | /*
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| 79 | * When writing the multiplier, if the length of the write is
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| 80 | * not sizeof(int), the multiplier is not changed
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| 81 | */
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| 82 | if (mult) {
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[1765] | 83 | multiplier = xatoi_u(mult);
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[821] | 84 | to_write = sizeof(int);
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| 85 | } else {
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| 86 | multiplier = 0;
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| 87 | to_write = 1; /* sth different from sizeof(int) */
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| 88 | }
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| 89 |
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[1765] | 90 | fd = xopen(defaultpro, O_WRONLY);
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[821] | 91 |
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[1765] | 92 | if (full_write(fd, &multiplier, to_write) != to_write)
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[821] | 93 | bb_perror_msg_and_die("error writing %s", defaultpro);
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| 94 |
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| 95 | close(fd);
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| 96 | return EXIT_SUCCESS;
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| 97 | }
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| 98 |
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| 99 | /*
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| 100 | * Use an fd for the profiling buffer, to skip stdio overhead
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| 101 | */
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[1765] | 102 | len = MAXINT(ssize_t);
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| 103 | buf = xmalloc_open_read_close(proFile, &len);
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[821] | 104 | if (!optNative) {
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| 105 | int entries = len/sizeof(*buf);
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[1765] | 106 | int big = 0, small = 0, i;
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[821] | 107 | unsigned *p;
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| 108 |
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| 109 | for (p = buf+1; p < buf+entries; p++) {
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| 110 | if (*p & ~0U << (sizeof(*buf)*4))
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| 111 | big++;
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| 112 | if (*p & ((1 << (sizeof(*buf)*4))-1))
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| 113 | small++;
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| 114 | }
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| 115 | if (big > small) {
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[1765] | 116 | bb_error_msg("assuming reversed byte order, "
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| 117 | "use -n to force native byte order");
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[821] | 118 | for (p = buf; p < buf+entries; p++)
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| 119 | for (i = 0; i < sizeof(*buf)/2; i++) {
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| 120 | unsigned char *b = (unsigned char *) p;
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| 121 | unsigned char tmp;
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| 122 |
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| 123 | tmp = b[i];
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| 124 | b[i] = b[sizeof(*buf)-i-1];
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| 125 | b[sizeof(*buf)-i-1] = tmp;
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| 126 | }
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | step = buf[0];
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| 131 | if (optInfo) {
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| 132 | printf("Sampling_step: %i\n", step);
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| 133 | return EXIT_SUCCESS;
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| 134 | }
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| 135 |
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| 136 | total = 0;
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| 137 |
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[1765] | 138 | map = xfopen(mapFile, "r");
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[821] | 139 |
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[1765] | 140 | while (fgets(mapline, S_LEN, map)) {
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| 141 | if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
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[821] | 142 | bb_error_msg_and_die("%s(%i): wrong map line",
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| 143 | mapFile, maplineno);
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| 144 |
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[1765] | 145 | if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
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[821] | 146 | add0 = fn_add;
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| 147 | break;
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| 148 | }
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| 149 | maplineno++;
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| 150 | }
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| 151 |
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| 152 | if (!add0)
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| 153 | bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
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| 154 |
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| 155 | /*
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| 156 | * Main loop.
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| 157 | */
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[1765] | 158 | while (fgets(mapline, S_LEN, map)) {
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[821] | 159 | unsigned int this = 0;
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| 160 |
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[1765] | 161 | if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
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[821] | 162 | bb_error_msg_and_die("%s(%i): wrong map line",
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[1765] | 163 | mapFile, maplineno);
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[821] | 164 |
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| 165 | header_printed = 0;
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| 166 |
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| 167 | /* ignore any LEADING (before a '[tT]' symbol is found)
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| 168 | Absolute symbols */
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| 169 | if ((*mode == 'A' || *mode == '?') && total == 0) continue;
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| 170 | if (*mode != 'T' && *mode != 't' &&
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| 171 | *mode != 'W' && *mode != 'w')
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| 172 | break; /* only text is profiled */
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| 173 |
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| 174 | if (indx >= len / sizeof(*buf))
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| 175 | bb_error_msg_and_die("profile address out of range. "
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| 176 | "Wrong map file?");
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| 177 |
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| 178 | while (indx < (next_add-add0)/step) {
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| 179 | if (optBins && (buf[indx] || optAll)) {
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| 180 | if (!header_printed) {
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[1765] | 181 | printf("%s:\n", fn_name);
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[821] | 182 | header_printed = 1;
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| 183 | }
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[1765] | 184 | printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
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[821] | 185 | }
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| 186 | this += buf[indx++];
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| 187 | }
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| 188 | total += this;
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| 189 |
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| 190 | if (optBins) {
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| 191 | if (optVerbose || this > 0)
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[1765] | 192 | printf(" total\t\t\t\t%u\n", this);
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[821] | 193 | } else if ((this || optAll) &&
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| 194 | (fn_len = next_add-fn_add) != 0) {
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| 195 | if (optVerbose)
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| 196 | printf("%016llx %-40s %6i %8.4f\n", fn_add,
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[1765] | 197 | fn_name, this, this/(double)fn_len);
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[821] | 198 | else
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| 199 | printf("%6i %-40s %8.4f\n",
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[1765] | 200 | this, fn_name, this/(double)fn_len);
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[821] | 201 | if (optSub) {
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| 202 | unsigned long long scan;
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| 203 |
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| 204 | for (scan = (fn_add-add0)/step + 1;
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| 205 | scan < (next_add-add0)/step; scan++) {
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| 206 | unsigned long long addr;
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| 207 |
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| 208 | addr = (scan - 1)*step + add0;
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| 209 | printf("\t%#llx\t%s+%#llx\t%u\n",
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| 210 | addr, fn_name, addr - fn_add,
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| 211 | buf[scan]);
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| 212 | }
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| 213 | }
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| 214 | }
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| 215 |
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| 216 | fn_add = next_add;
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[1765] | 217 | strcpy(fn_name, next_name);
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[821] | 218 |
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| 219 | maplineno++;
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| 220 | }
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| 221 |
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| 222 | /* clock ticks, out of kernel text - probably modules */
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| 223 | printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
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| 224 |
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| 225 | /* trailer */
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| 226 | if (optVerbose)
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| 227 | printf("%016x %-40s %6i %8.4f\n",
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[1765] | 228 | 0, "total", total, total/(double)(fn_add-add0));
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[821] | 229 | else
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| 230 | printf("%6i %-40s %8.4f\n",
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[1765] | 231 | total, "total", total/(double)(fn_add-add0));
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[821] | 232 |
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| 233 | fclose(map);
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| 234 | free(buf);
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| 235 |
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| 236 | return EXIT_SUCCESS;
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| 237 | }
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