/* 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 * - 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 . */ #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); 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(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 = MAXINT(ssize_t); 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; }