| /* 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>. |
| */ |
| //config:config READPROFILE |
| //config: bool "readprofile (7.1 kb)" |
| //config: default y |
| //config: help |
| //config: This allows you to parse /proc/profile for basic profiling. |
| |
| //applet:IF_READPROFILE(APPLET(readprofile, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_READPROFILE) += readprofile.o |
| |
| //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 |
| |
| 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; |
| size_t len; |
| uint64_t add0; |
| 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; |
| int multiplier; |
| 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 = "/proc/profile"; |
| mapFile = "/boot/System.map"; |
| multiplier = 0; |
| |
| 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("/proc/profile", 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); |
| len /= sizeof(*buf); |
| |
| if (!optNative) { |
| int big = 0, small = 0; |
| unsigned *p; |
| |
| for (p = buf+1; p < buf+len; p++) { |
| if (*p & ~0U << (sizeof(*buf)*4)) |
| big++; |
| if (*p & ((1 << (sizeof(*buf)*4))-1)) |
| small++; |
| } |
| if (big > small) { |
| bb_simple_error_msg("assuming reversed byte order, " |
| "use -n to force native byte order"); |
| BUILD_BUG_ON(sizeof(*p) > 8); |
| for (p = buf; p < buf+len; p++) { |
| if (sizeof(*p) == 2) |
| *p = bswap_16(*p); |
| if (sizeof(*p) == 4) |
| *p = bswap_32(*p); |
| if (sizeof(*p) == 8) |
| *p = bb_bswap_64(*p); |
| } |
| } |
| } |
| |
| step = buf[0]; |
| if (optInfo) { |
| printf("Sampling_step: %u\n", step); |
| return EXIT_SUCCESS; |
| } |
| |
| map = xfopen_for_read(mapFile); |
| add0 = 0; |
| maplineno = 1; |
| 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") == 0) /* 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. |
| */ |
| total = 0; |
| indx = 1; |
| while (fgets(mapline, S_LEN, map)) { |
| bool header_printed; |
| unsigned int this; |
| |
| 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[0] == 'A' || mode[0] == '?') && total == 0) |
| continue; |
| if ((mode[0]|0x20) != 't' && (mode[0]|0x20) != 'w') { |
| break; /* only text is profiled */ |
| } |
| |
| if (indx >= len) |
| bb_simple_error_msg_and_die("profile address out of range. " |
| "Wrong map file?"); |
| |
| this = 0; |
| 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 %6u %8.4f\n", fn_add, |
| fn_name, this, this/(double)fn_len); |
| else |
| printf("%6u %-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("%6u *unknown*\n", buf[len-1]); |
| |
| /* trailer */ |
| if (optVerbose) |
| printf("%016x %-40s %6u %8.4f\n", |
| 0, "total", total, total/(double)(fn_add-add0)); |
| else |
| printf("%6u %-40s %8.4f\n", |
| total, "total", total/(double)(fn_add-add0)); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| fclose(map); |
| free(buf); |
| } |
| |
| return EXIT_SUCCESS; |
| } |