source: MondoRescue/branches/3.2/mindi-busybox/util-linux/readprofile.c@ 3322

/* vi: set sw=4 ts=4: */
/*
 *  readprofile.c - used to read /proc/profile
 *
 *  Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/*
 * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL>
 * - added Native Language Support
 * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
 * - 64bit clean patch
 * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
 * - -M option to write profile multiplier.
 * 2001-11-07 Werner Almesberger <wa@almesberger.net>
 * - byte order auto-detection and -n option
 * 2001-11-09 Werner Almesberger <wa@almesberger.net>
 * - skip step size (index 0)
 * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
 * - make maplineno do something
 * 2002-11-28 Mads Martin Joergensen +
 * - also try /boot/System.map-`uname -r`
 * 2003-04-09 Werner Almesberger <wa@almesberger.net>
 * - fixed off-by eight error and improved heuristics in byte order detection
 * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
 * - added -s option; example of use:
 * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
 *
 * Taken from util-linux and adapted for busybox by
 * Paul Mundt <lethal@linux-sh.org>.
 */

//usage:#define readprofile_trivial_usage
//usage:       "[OPTIONS]"
//usage:#define readprofile_full_usage "\n\n"
//usage:       "    -m mapfile  (Default: /boot/System.map)"
//usage:     "\n    -p profile  (Default: /proc/profile)"
//usage:     "\n    -M NUM      Set the profiling multiplier to NUM"
//usage:     "\n    -i      Print only info about the sampling step"
//usage:     "\n    -v      Verbose"
//usage:     "\n    -a      Print all symbols, even if count is 0"
//usage:     "\n    -b      Print individual histogram-bin counts"
//usage:     "\n    -s      Print individual counters within functions"
//usage:     "\n    -r      Reset all the counters (root only)"
//usage:     "\n    -n      Disable byte order auto-detection"

#include "libbb.h"
#include <sys/utsname.h>

#define S_LEN 128

/* These are the defaults */
static const char defaultmap[] ALIGN1 = "/boot/System.map";
static const char defaultpro[] ALIGN1 = "/proc/profile";

int readprofile_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int readprofile_main(int argc UNUSED_PARAM, char **argv)
{
    FILE *map;
    const char *mapFile, *proFile;
    unsigned long indx = 1;
    size_t len;
    uint64_t add0 = 0;
    unsigned int step;
    unsigned int *buf, total, fn_len;
    unsigned long long fn_add, next_add;     /* current and next address */
    char fn_name[S_LEN], next_name[S_LEN];   /* current and next name */
    char mapline[S_LEN];
    char mode[8];
    int maplineno = 1;
    int header_printed;
    int multiplier = 0;
    unsigned opt;
    enum {
        OPT_M = (1 << 0),
        OPT_m = (1 << 1),
        OPT_p = (1 << 2),
        OPT_n = (1 << 3),
        OPT_a = (1 << 4),
        OPT_b = (1 << 5),
        OPT_s = (1 << 6),
        OPT_i = (1 << 7),
        OPT_r = (1 << 8),
        OPT_v = (1 << 9),
    };
#define optMult    (opt & OPT_M)
#define optNative  (opt & OPT_n)
#define optAll     (opt & OPT_a)
#define optBins    (opt & OPT_b)
#define optSub     (opt & OPT_s)
#define optInfo    (opt & OPT_i)
#define optReset   (opt & OPT_r)
#define optVerbose (opt & OPT_v)

#define next (current^1)

    proFile = defaultpro;
    mapFile = defaultmap;

    opt_complementary = "M+"; /* -M N */
    opt = getopt32(argv, "M:m:p:nabsirv", &multiplier, &mapFile, &proFile);

    if (opt & (OPT_M|OPT_r)) { /* mult or reset, or both */
        int fd, to_write;

        /*
         * When writing the multiplier, if the length of the write is
         * not sizeof(int), the multiplier is not changed
         */
        to_write = sizeof(int);
        if (!optMult)
            to_write = 1;  /* sth different from sizeof(int) */

        fd = xopen(defaultpro, O_WRONLY);
        xwrite(fd, &multiplier, to_write);
        close(fd);
        return EXIT_SUCCESS;
    }

    /*
     * Use an fd for the profiling buffer, to skip stdio overhead
     */
    len = MAXINT(ssize_t);
    buf = xmalloc_xopen_read_close(proFile, &len);
    if (!optNative) {
        int entries = len / sizeof(*buf);
        int big = 0, small = 0, i;
        unsigned *p;

        for (p = buf+1; p < buf+entries; p++) {
            if (*p & ~0U << (sizeof(*buf)*4))
                big++;
            if (*p & ((1 << (sizeof(*buf)*4))-1))
                small++;
        }
        if (big > small) {
            bb_error_msg("assuming reversed byte order, "
                "use -n to force native byte order");
            for (p = buf; p < buf+entries; p++)
                for (i = 0; i < sizeof(*buf)/2; i++) {
                    unsigned char *b = (unsigned char *) p;
                    unsigned char tmp;

                    tmp = b[i];
                    b[i] = b[sizeof(*buf)-i-1];
                    b[sizeof(*buf)-i-1] = tmp;
                }
        }
    }

    step = buf[0];
    if (optInfo) {
        printf("Sampling_step: %i\n", step);
        return EXIT_SUCCESS;
    }

    total = 0;

    map = xfopen_for_read(mapFile);

    while (fgets(mapline, S_LEN, map)) {
        if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3)
            bb_error_msg_and_die("%s(%i): wrong map line",
                    mapFile, maplineno);

        if (!strcmp(fn_name, "_stext")) /* only elf works like this */ {
            add0 = fn_add;
            break;
        }
        maplineno++;
    }

    if (!add0)
        bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);

    /*
     * Main loop.
     */
    while (fgets(mapline, S_LEN, map)) {
        unsigned int this = 0;

        if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3)
            bb_error_msg_and_die("%s(%i): wrong map line",
                    mapFile, maplineno);

        header_printed = 0;

        /* ignore any LEADING (before a '[tT]' symbol is found)
           Absolute symbols */
        if ((*mode == 'A' || *mode == '?') && total == 0) continue;
        if (*mode != 'T' && *mode != 't'
         && *mode != 'W' && *mode != 'w'
        ) {
            break;  /* only text is profiled */
        }

        if (indx >= len / sizeof(*buf))
            bb_error_msg_and_die("profile address out of range. "
                    "Wrong map file?");

        while (indx < (next_add-add0)/step) {
            if (optBins && (buf[indx] || optAll)) {
                if (!header_printed) {
                    printf("%s:\n", fn_name);
                    header_printed = 1;
                }
                printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
            }
            this += buf[indx++];
        }
        total += this;

        if (optBins) {
            if (optVerbose || this > 0)
                printf("  total\t\t\t\t%u\n", this);
        } else if ((this || optAll)
                && (fn_len = next_add-fn_add) != 0
        ) {
            if (optVerbose)
                printf("%016llx %-40s %6i %8.4f\n", fn_add,
                    fn_name, this, this/(double)fn_len);
            else
                printf("%6i %-40s %8.4f\n",
                    this, fn_name, this/(double)fn_len);
            if (optSub) {
                unsigned long long scan;

                for (scan = (fn_add-add0)/step + 1;
                     scan < (next_add-add0)/step; scan++) {
                    unsigned long long addr;

                    addr = (scan - 1)*step + add0;
                    printf("\t%#llx\t%s+%#llx\t%u\n",
                        addr, fn_name, addr - fn_add,
                        buf[scan]);
                }
            }
        }

        fn_add = next_add;
        strcpy(fn_name, next_name);

        maplineno++;
    }

    /* clock ticks, out of kernel text - probably modules */
    printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");

    /* trailer */
    if (optVerbose)
        printf("%016x %-40s %6i %8.4f\n",
            0, "total", total, total/(double)(fn_add-add0));
    else
        printf("%6i %-40s %8.4f\n",
            total, "total", total/(double)(fn_add-add0));

    fclose(map);
    free(buf);

    return EXIT_SUCCESS;
}