/* 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 * - added Native Language Support * 1999-09-01 Stephane Eranian * - 64bit clean patch * 3Feb2001 Andrew Morton * - -M option to write profile multiplier. * 2001-11-07 Werner Almesberger * - byte order auto-detection and -n option * 2001-11-09 Werner Almesberger * - skip step size (index 0) * 2002-03-09 John Levon * - make maplineno do something * 2002-11-28 Mads Martin Joergensen + * - also try /boot/System.map-`uname -r` * 2003-04-09 Werner Almesberger * - fixed off-by eight error and improved heuristics in byte order detection * 2003-08-12 Nikita Danilov * - 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 . */ //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 #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: %u\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 %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 %s\n", buf[len/sizeof(*buf)-1], "*unknown*"); /* 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)); fclose(map); free(buf); return EXIT_SUCCESS; }