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300 lines
7.2 KiB
C
300 lines
7.2 KiB
C
/*
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* readprofile.c - used to read /proc/profile
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*
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* Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
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* - added Native Language Support
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* 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
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* - 64bit clean patch
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* 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
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* - -M option to write profile multiplier.
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* 2001-11-07 Werner Almesberger <wa@almesberger.net>
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* - byte order auto-detection and -n option
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* 2001-11-09 Werner Almesberger <wa@almesberger.net>
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* - skip step size (index 0)
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* 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
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* - make maplineno do something
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* 2002-11-28 Mads Martin Joergensen +
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* - also try /boot/System.map-`uname -r`
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* 2003-04-09 Werner Almesberger <wa@almesberger.net>
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* - fixed off-by eight error and improved heuristics in byte order detection
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* 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
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* - added -s option; example of use:
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* "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
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*
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* Taken from util-linux and adapted for busybox by
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* Paul Mundt <lethal@linux-sh.org>.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/utsname.h>
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#include "busybox.h"
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#define S_LEN 128
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/* These are the defaults */
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static const char defaultmap[]="/boot/System.map";
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static const char defaultpro[]="/proc/profile";
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int readprofile_main(int argc, char **argv)
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{
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FILE *map;
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int proFd;
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const char *mapFile, *proFile, *mult=0;
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unsigned long len=0, indx=1;
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unsigned long long add0=0;
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unsigned int step;
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unsigned int *buf, total, fn_len;
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unsigned long long fn_add, next_add; /* current and next address */
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char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
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char mode[8];
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int c;
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int optAll=0, optInfo=0, optReset=0, optVerbose=0, optNative=0;
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int optBins=0, optSub=0;
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char mapline[S_LEN];
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int maplineno=1;
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int header_printed;
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#define next (current^1)
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proFile = defaultpro;
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mapFile = defaultmap;
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while ((c = getopt(argc, argv, "M:m:np:itvarVbs")) != -1) {
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switch(c) {
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case 'm':
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mapFile = optarg;
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break;
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case 'n':
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optNative++;
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break;
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case 'p':
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proFile = optarg;
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break;
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case 'a':
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optAll++;
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break;
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case 'b':
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optBins++;
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break;
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case 's':
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optSub++;
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break;
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case 'i':
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optInfo++;
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break;
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case 'M':
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mult = optarg;
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break;
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case 'r':
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optReset++;
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break;
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case 'v':
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optVerbose++;
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break;
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default:
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bb_show_usage();
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}
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}
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if (optReset || mult) {
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int multiplier, fd, to_write;
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/*
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* When writing the multiplier, if the length of the write is
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* not sizeof(int), the multiplier is not changed
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*/
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if (mult) {
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multiplier = strtoul(mult, 0, 10);
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to_write = sizeof(int);
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} else {
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multiplier = 0;
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to_write = 1; /* sth different from sizeof(int) */
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}
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fd = bb_xopen(defaultpro,O_WRONLY);
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if (write(fd, &multiplier, to_write) != to_write)
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bb_perror_msg_and_die("error writing %s", defaultpro);
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close(fd);
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return EXIT_SUCCESS;
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}
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/*
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* Use an fd for the profiling buffer, to skip stdio overhead
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*/
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proFd = bb_xopen(proFile,O_RDONLY);
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if (((int)(len=lseek(proFd,0,SEEK_END)) < 0)
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|| (lseek(proFd,0,SEEK_SET) < 0))
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bb_perror_msg_and_die(proFile);
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buf = xmalloc(len);
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if (read(proFd,buf,len) != len)
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bb_perror_msg_and_die(proFile);
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close(proFd);
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if (!optNative) {
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int entries = len/sizeof(*buf);
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int big = 0,small = 0,i;
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unsigned *p;
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for (p = buf+1; p < buf+entries; p++) {
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if (*p & ~0U << (sizeof(*buf)*4))
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big++;
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if (*p & ((1 << (sizeof(*buf)*4))-1))
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small++;
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}
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if (big > small) {
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bb_error_msg("Assuming reversed byte order. "
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"Use -n to force native byte order.");
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for (p = buf; p < buf+entries; p++)
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for (i = 0; i < sizeof(*buf)/2; i++) {
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unsigned char *b = (unsigned char *) p;
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unsigned char tmp;
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tmp = b[i];
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b[i] = b[sizeof(*buf)-i-1];
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b[sizeof(*buf)-i-1] = tmp;
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}
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}
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}
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step = buf[0];
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if (optInfo) {
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printf("Sampling_step: %i\n", step);
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return EXIT_SUCCESS;
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}
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total = 0;
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map = bb_xfopen(mapFile, "r");
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while (fgets(mapline,S_LEN,map)) {
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if (sscanf(mapline,"%llx %s %s",&fn_add,mode,fn_name) != 3)
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bb_error_msg_and_die("%s(%i): wrong map line",
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mapFile, maplineno);
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if (!strcmp(fn_name,"_stext")) /* only elf works like this */ {
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add0 = fn_add;
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break;
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}
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maplineno++;
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}
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if (!add0)
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bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
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/*
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* Main loop.
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*/
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while (fgets(mapline,S_LEN,map)) {
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unsigned int this = 0;
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if (sscanf(mapline,"%llx %s %s",&next_add,mode,next_name) != 3)
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bb_error_msg_and_die("%s(%i): wrong map line",
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mapFile, maplineno);
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header_printed = 0;
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/* ignore any LEADING (before a '[tT]' symbol is found)
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Absolute symbols */
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if ((*mode == 'A' || *mode == '?') && total == 0) continue;
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if (*mode != 'T' && *mode != 't' &&
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*mode != 'W' && *mode != 'w')
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break; /* only text is profiled */
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if (indx >= len / sizeof(*buf))
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bb_error_msg_and_die("profile address out of range. "
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"Wrong map file?");
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while (indx < (next_add-add0)/step) {
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if (optBins && (buf[indx] || optAll)) {
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if (!header_printed) {
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printf ("%s:\n", fn_name);
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header_printed = 1;
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}
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printf ("\t%llx\t%u\n", (indx - 1)*step + add0, buf[indx]);
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}
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this += buf[indx++];
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}
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total += this;
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if (optBins) {
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if (optVerbose || this > 0)
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printf (" total\t\t\t\t%u\n", this);
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} else if ((this || optAll) &&
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(fn_len = next_add-fn_add) != 0) {
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if (optVerbose)
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printf("%016llx %-40s %6i %8.4f\n", fn_add,
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fn_name,this,this/(double)fn_len);
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else
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printf("%6i %-40s %8.4f\n",
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this,fn_name,this/(double)fn_len);
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if (optSub) {
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unsigned long long scan;
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for (scan = (fn_add-add0)/step + 1;
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scan < (next_add-add0)/step; scan++) {
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unsigned long long addr;
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addr = (scan - 1)*step + add0;
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printf("\t%#llx\t%s+%#llx\t%u\n",
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addr, fn_name, addr - fn_add,
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buf[scan]);
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}
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}
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}
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fn_add = next_add;
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strcpy(fn_name,next_name);
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maplineno++;
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}
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/* clock ticks, out of kernel text - probably modules */
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printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
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/* trailer */
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if (optVerbose)
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printf("%016x %-40s %6i %8.4f\n",
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0,"total",total,total/(double)(fn_add-add0));
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else
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printf("%6i %-40s %8.4f\n",
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total,"total",total/(double)(fn_add-add0));
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fclose(map);
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free(buf);
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return EXIT_SUCCESS;
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}
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