1/* vi: set sw=4 ts=4: */ 2/* 3 * readprofile.c - used to read /proc/profile 4 * 5 * Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it) 6 * 7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 8 */ 9 10/* 11 * 1999-02-22 Arkadiusz Mi�kiewicz <misiek@pld.ORG.PL> 12 * - added Native Language Support 13 * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com> 14 * - 64bit clean patch 15 * 3Feb2001 Andrew Morton <andrewm@uow.edu.au> 16 * - -M option to write profile multiplier. 17 * 2001-11-07 Werner Almesberger <wa@almesberger.net> 18 * - byte order auto-detection and -n option 19 * 2001-11-09 Werner Almesberger <wa@almesberger.net> 20 * - skip step size (index 0) 21 * 2002-03-09 John Levon <moz@compsoc.man.ac.uk> 22 * - make maplineno do something 23 * 2002-11-28 Mads Martin Joergensen + 24 * - also try /boot/System.map-`uname -r` 25 * 2003-04-09 Werner Almesberger <wa@almesberger.net> 26 * - fixed off-by eight error and improved heuristics in byte order detection 27 * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM> 28 * - added -s option; example of use: 29 * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3" 30 * 31 * Taken from util-linux and adapted for busybox by 32 * Paul Mundt <lethal@linux-sh.org>. 33 */ 34 35#include "libbb.h" 36#include <sys/utsname.h> 37 38#define S_LEN 128 39 40/* These are the defaults */ 41static const char defaultmap[] ALIGN1 = "/boot/System.map"; 42static const char defaultpro[] ALIGN1 = "/proc/profile"; 43 44int readprofile_main(int argc, char **argv); 45int readprofile_main(int argc, char **argv) 46{ 47 FILE *map; 48 const char *mapFile, *proFile, *mult = 0; 49 unsigned long indx = 1; 50 size_t len; 51 uint64_t add0 = 0; 52 unsigned int step; 53 unsigned int *buf, total, fn_len; 54 unsigned long long fn_add, next_add; /* current and next address */ 55 char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */ 56 char mapline[S_LEN]; 57 char mode[8]; 58 int optAll = 0, optInfo = 0, optReset = 0; 59 int optVerbose = 0, optNative = 0; 60 int optBins = 0, optSub = 0; 61 int maplineno = 1; 62 int header_printed; 63 64#define next (current^1) 65 66 proFile = defaultpro; 67 mapFile = defaultmap; 68 69 opt_complementary = "nn:aa:bb:ss:ii:rr:vv"; 70 getopt32(argv, "M:m:p:nabsirv", 71 &mult, &mapFile, &proFile, 72 &optNative, &optAll, &optBins, &optSub, 73 &optInfo, &optReset, &optVerbose); 74 75 if (optReset || mult) { 76 int multiplier, fd, to_write; 77 78 /* 79 * When writing the multiplier, if the length of the write is 80 * not sizeof(int), the multiplier is not changed 81 */ 82 if (mult) { 83 multiplier = xatoi_u(mult); 84 to_write = sizeof(int); 85 } else { 86 multiplier = 0; 87 to_write = 1; /* sth different from sizeof(int) */ 88 } 89 90 fd = xopen(defaultpro, O_WRONLY); 91 92 if (full_write(fd, &multiplier, to_write) != to_write) 93 bb_perror_msg_and_die("error writing %s", defaultpro); 94 95 close(fd); 96 return EXIT_SUCCESS; 97 } 98 99 /* 100 * Use an fd for the profiling buffer, to skip stdio overhead 101 */ 102 len = MAXINT(ssize_t); 103 buf = xmalloc_open_read_close(proFile, &len); 104 if (!optNative) { 105 int entries = len/sizeof(*buf); 106 int big = 0, small = 0, i; 107 unsigned *p; 108 109 for (p = buf+1; p < buf+entries; p++) { 110 if (*p & ~0U << (sizeof(*buf)*4)) 111 big++; 112 if (*p & ((1 << (sizeof(*buf)*4))-1)) 113 small++; 114 } 115 if (big > small) { 116 bb_error_msg("assuming reversed byte order, " 117 "use -n to force native byte order"); 118 for (p = buf; p < buf+entries; p++) 119 for (i = 0; i < sizeof(*buf)/2; i++) { 120 unsigned char *b = (unsigned char *) p; 121 unsigned char tmp; 122 123 tmp = b[i]; 124 b[i] = b[sizeof(*buf)-i-1]; 125 b[sizeof(*buf)-i-1] = tmp; 126 } 127 } 128 } 129 130 step = buf[0]; 131 if (optInfo) { 132 printf("Sampling_step: %i\n", step); 133 return EXIT_SUCCESS; 134 } 135 136 total = 0; 137 138 map = xfopen(mapFile, "r"); 139 140 while (fgets(mapline, S_LEN, map)) { 141 if (sscanf(mapline, "%llx %s %s", &fn_add, mode, fn_name) != 3) 142 bb_error_msg_and_die("%s(%i): wrong map line", 143 mapFile, maplineno); 144 145 if (!strcmp(fn_name, "_stext")) /* only elf works like this */ { 146 add0 = fn_add; 147 break; 148 } 149 maplineno++; 150 } 151 152 if (!add0) 153 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile); 154 155 /* 156 * Main loop. 157 */ 158 while (fgets(mapline, S_LEN, map)) { 159 unsigned int this = 0; 160 161 if (sscanf(mapline, "%llx %s %s", &next_add, mode, next_name) != 3) 162 bb_error_msg_and_die("%s(%i): wrong map line", 163 mapFile, maplineno); 164 165 header_printed = 0; 166 167 /* ignore any LEADING (before a '[tT]' symbol is found) 168 Absolute symbols */ 169 if ((*mode == 'A' || *mode == '?') && total == 0) continue; 170 if (*mode != 'T' && *mode != 't' && 171 *mode != 'W' && *mode != 'w') 172 break; /* only text is profiled */ 173 174 if (indx >= len / sizeof(*buf)) 175 bb_error_msg_and_die("profile address out of range. " 176 "Wrong map file?"); 177 178 while (indx < (next_add-add0)/step) { 179 if (optBins && (buf[indx] || optAll)) { 180 if (!header_printed) { 181 printf("%s:\n", fn_name); 182 header_printed = 1; 183 } 184 printf("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]); 185 } 186 this += buf[indx++]; 187 } 188 total += this; 189 190 if (optBins) { 191 if (optVerbose || this > 0) 192 printf(" total\t\t\t\t%u\n", this); 193 } else if ((this || optAll) && 194 (fn_len = next_add-fn_add) != 0) { 195 if (optVerbose) 196 printf("%016llx %-40s %6i %8.4f\n", fn_add, 197 fn_name, this, this/(double)fn_len); 198 else 199 printf("%6i %-40s %8.4f\n", 200 this, fn_name, this/(double)fn_len); 201 if (optSub) { 202 unsigned long long scan; 203 204 for (scan = (fn_add-add0)/step + 1; 205 scan < (next_add-add0)/step; scan++) { 206 unsigned long long addr; 207 208 addr = (scan - 1)*step + add0; 209 printf("\t%#llx\t%s+%#llx\t%u\n", 210 addr, fn_name, addr - fn_add, 211 buf[scan]); 212 } 213 } 214 } 215 216 fn_add = next_add; 217 strcpy(fn_name, next_name); 218 219 maplineno++; 220 } 221 222 /* clock ticks, out of kernel text - probably modules */ 223 printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*"); 224 225 /* trailer */ 226 if (optVerbose) 227 printf("%016x %-40s %6i %8.4f\n", 228 0, "total", total, total/(double)(fn_add-add0)); 229 else 230 printf("%6i %-40s %8.4f\n", 231 total, "total", total/(double)(fn_add-add0)); 232 233 fclose(map); 234 free(buf); 235 236 return EXIT_SUCCESS; 237} 238