1 files changed, 236 insertions, 0 deletions

diff --git a/util-linux/readprofile.c b/util-linux/readprofile.c
new file mode 100644
index 000000000..dd810f021
--- /dev/null
+++ b/util-linux/readprofile.c
@@ -0,0 +1,236 @@
+/* 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 tarball for details.
+ */
+
+/*
+ * 1999-02-22 Arkadiusz Mi¶kiewicz <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>.
+ */
+
+#include "busybox.h"
+#include <sys/utsname.h>
+
+#define S_LEN 128
+
+/* These are the defaults */
+static const char defaultmap[] = "/boot/System.map";
+static const char defaultpro[] = "/proc/profile";
+
+int readprofile_main(int argc, char **argv)
+{
+        FILE *map;
+        const char *mapFile, *proFile, *mult = 0;
+        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 optAll = 0, optInfo = 0, optReset = 0;
+        int optVerbose = 0, optNative = 0;
+        int optBins = 0, optSub = 0;
+        int maplineno = 1;
+        int header_printed;
+
+#define next (current^1)
+
+        proFile = defaultpro;
+        mapFile = defaultmap;
+
+        opt_complementary = "nn:aa:bb:ss:ii:rr:vv";
+        getopt32(argc, argv, "M:m:p:nabsirv",
+                        &mult, &mapFile, &proFile,
+                        &optNative, &optAll, &optBins, &optSub,
+                        &optInfo, &optReset, &optVerbose);
+
+        if (optReset || mult) {
+                int multiplier, fd, to_write;
+
+                /*
+                 * When writing the multiplier, if the length of the write is
+                 * not sizeof(int), the multiplier is not changed
+                 */
+                if (mult) {
+                        multiplier = xatoi_u(mult);
+                        to_write = sizeof(int);
+                } else {
+                        multiplier = 0;
+                        to_write = 1;   /* sth different from sizeof(int) */
+                }
+
+                fd = xopen(defaultpro, O_WRONLY);
+
+                if (full_write(fd, &multiplier, to_write) != to_write)
+                        bb_perror_msg_and_die("error writing %s", defaultpro);
+
+                close(fd);
+                return EXIT_SUCCESS;
+        }
+
+        /*
+         * Use an fd for the profiling buffer, to skip stdio overhead
+         */
+        len = INT_MAX;
+        buf = xmalloc_open_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(mapFile, "r");
+
+        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;
+}