[821] | 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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[902] | 70 | uint64_t add0=0;
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[821] | 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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[902] | 246 | printf ("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
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[821] | 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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