blob: e635f6bf380df78bf2b8fad89cad97305b3eee4d [file] [log] [blame]
"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
Paul Mundt8b2d02e2005-05-20 17:22:18 +00002/*
3 * readprofile.c - used to read /proc/profile
4 *
5 * Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
6 *
Rob Landleyd921b2e2006-08-03 15:41:12 +00007 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Paul Mundt8b2d02e2005-05-20 17:22:18 +00008 */
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
Paul Mundt8b2d02e2005-05-20 17:22:18 +000035#include "busybox.h"
Rob Landleyd921b2e2006-08-03 15:41:12 +000036#include <sys/utsname.h>
Paul Mundt8b2d02e2005-05-20 17:22:18 +000037
38#define S_LEN 128
39
40/* These are the defaults */
Denis Vlasenko13858992006-10-08 12:49:22 +000041static const char defaultmap[] = "/boot/System.map";
42static const char defaultpro[] = "/proc/profile";
Paul Mundt8b2d02e2005-05-20 17:22:18 +000043
44int readprofile_main(int argc, char **argv)
45{
46 FILE *map;
"Vladimir N. Oleynik"1f0262b2005-10-20 11:17:48 +000047 const char *mapFile, *proFile, *mult=0;
Denis Vlasenkoea620772006-10-14 02:23:43 +000048 unsigned long indx=1;
49 size_t len;
Rob Landley72509152006-08-06 20:41:11 +000050 uint64_t add0=0;
Paul Mundt8b2d02e2005-05-20 17:22:18 +000051 unsigned int step;
52 unsigned int *buf, total, fn_len;
Denis Vlasenkocad36682006-09-22 08:39:49 +000053 unsigned long long fn_add, next_add; /* current and next address */
Paul Mundt8b2d02e2005-05-20 17:22:18 +000054 char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */
55 char mode[8];
Paul Mundt8b2d02e2005-05-20 17:22:18 +000056 int optAll=0, optInfo=0, optReset=0, optVerbose=0, optNative=0;
57 int optBins=0, optSub=0;
58 char mapline[S_LEN];
59 int maplineno=1;
60 int header_printed;
61
62#define next (current^1)
63
64 proFile = defaultpro;
65 mapFile = defaultmap;
66
Denis Vlasenko67b23e62006-10-03 21:00:06 +000067 opt_complementary = "nn:aa:bb:ss:ii:rr:vv";
68 getopt32(argc, argv, "M:m:p:nabsirv",
Denis Vlasenkocad36682006-09-22 08:39:49 +000069 &mult, &mapFile, &proFile,
70 &optNative, &optAll, &optBins, &optSub,
71 &optInfo, &optReset, &optVerbose);
Paul Mundt8b2d02e2005-05-20 17:22:18 +000072
73 if (optReset || mult) {
74 int multiplier, fd, to_write;
75
76 /*
77 * When writing the multiplier, if the length of the write is
78 * not sizeof(int), the multiplier is not changed
79 */
80 if (mult) {
Denis Vlasenko13858992006-10-08 12:49:22 +000081 multiplier = xatoi_u(mult);
Paul Mundt8b2d02e2005-05-20 17:22:18 +000082 to_write = sizeof(int);
83 } else {
84 multiplier = 0;
85 to_write = 1; /* sth different from sizeof(int) */
86 }
87
Rob Landleyd921b2e2006-08-03 15:41:12 +000088 fd = xopen(defaultpro,O_WRONLY);
Paul Mundt8b2d02e2005-05-20 17:22:18 +000089
90 if (write(fd, &multiplier, to_write) != to_write)
91 bb_perror_msg_and_die("error writing %s", defaultpro);
92
93 close(fd);
94 return EXIT_SUCCESS;
95 }
96
97 /*
98 * Use an fd for the profiling buffer, to skip stdio overhead
99 */
Denis Vlasenkoea620772006-10-14 02:23:43 +0000100 len = INT_MAX;
101 buf = xmalloc_open_read_close(proFile, &len);
Paul Mundt8b2d02e2005-05-20 17:22:18 +0000102 if (!optNative) {
103 int entries = len/sizeof(*buf);
104 int big = 0,small = 0,i;
105 unsigned *p;
106
107 for (p = buf+1; p < buf+entries; p++) {
108 if (*p & ~0U << (sizeof(*buf)*4))
109 big++;
110 if (*p & ((1 << (sizeof(*buf)*4))-1))
111 small++;
112 }
113 if (big > small) {
Denis Vlasenkoea620772006-10-14 02:23:43 +0000114 bb_error_msg("assuming reversed byte order, "
115 "use -n to force native byte order");
Paul Mundt8b2d02e2005-05-20 17:22:18 +0000116 for (p = buf; p < buf+entries; p++)
117 for (i = 0; i < sizeof(*buf)/2; i++) {
118 unsigned char *b = (unsigned char *) p;
119 unsigned char tmp;
120
121 tmp = b[i];
122 b[i] = b[sizeof(*buf)-i-1];
123 b[sizeof(*buf)-i-1] = tmp;
124 }
125 }
126 }
127
128 step = buf[0];
129 if (optInfo) {
130 printf("Sampling_step: %i\n", step);
131 return EXIT_SUCCESS;
132 }
133
134 total = 0;
135
Rob Landleyd921b2e2006-08-03 15:41:12 +0000136 map = xfopen(mapFile, "r");
Paul Mundt8b2d02e2005-05-20 17:22:18 +0000137
138 while (fgets(mapline,S_LEN,map)) {
139 if (sscanf(mapline,"%llx %s %s",&fn_add,mode,fn_name) != 3)
140 bb_error_msg_and_die("%s(%i): wrong map line",
141 mapFile, maplineno);
142
143 if (!strcmp(fn_name,"_stext")) /* only elf works like this */ {
144 add0 = fn_add;
145 break;
146 }
147 maplineno++;
148 }
149
150 if (!add0)
Rob Landleyb7285002005-09-14 15:28:15 +0000151 bb_error_msg_and_die("can't find \"_stext\" in %s", mapFile);
Paul Mundt8b2d02e2005-05-20 17:22:18 +0000152
153 /*
154 * Main loop.
155 */
156 while (fgets(mapline,S_LEN,map)) {
157 unsigned int this = 0;
158
159 if (sscanf(mapline,"%llx %s %s",&next_add,mode,next_name) != 3)
Rob Landleyb7285002005-09-14 15:28:15 +0000160 bb_error_msg_and_die("%s(%i): wrong map line",
Paul Mundt8b2d02e2005-05-20 17:22:18 +0000161 mapFile, maplineno);
162
163 header_printed = 0;
164
165 /* ignore any LEADING (before a '[tT]' symbol is found)
166 Absolute symbols */
167 if ((*mode == 'A' || *mode == '?') && total == 0) continue;
168 if (*mode != 'T' && *mode != 't' &&
169 *mode != 'W' && *mode != 'w')
170 break; /* only text is profiled */
171
172 if (indx >= len / sizeof(*buf))
173 bb_error_msg_and_die("profile address out of range. "
174 "Wrong map file?");
175
176 while (indx < (next_add-add0)/step) {
177 if (optBins && (buf[indx] || optAll)) {
178 if (!header_printed) {
179 printf ("%s:\n", fn_name);
180 header_printed = 1;
181 }
Rob Landley72509152006-08-06 20:41:11 +0000182 printf ("\t%"PRIx64"\t%u\n", (indx - 1)*step + add0, buf[indx]);
Paul Mundt8b2d02e2005-05-20 17:22:18 +0000183 }
184 this += buf[indx++];
185 }
186 total += this;
187
188 if (optBins) {
189 if (optVerbose || this > 0)
190 printf (" total\t\t\t\t%u\n", this);
191 } else if ((this || optAll) &&
192 (fn_len = next_add-fn_add) != 0) {
193 if (optVerbose)
194 printf("%016llx %-40s %6i %8.4f\n", fn_add,
195 fn_name,this,this/(double)fn_len);
196 else
197 printf("%6i %-40s %8.4f\n",
198 this,fn_name,this/(double)fn_len);
199 if (optSub) {
200 unsigned long long scan;
201
202 for (scan = (fn_add-add0)/step + 1;
203 scan < (next_add-add0)/step; scan++) {
204 unsigned long long addr;
205
206 addr = (scan - 1)*step + add0;
207 printf("\t%#llx\t%s+%#llx\t%u\n",
208 addr, fn_name, addr - fn_add,
209 buf[scan]);
210 }
211 }
212 }
213
214 fn_add = next_add;
215 strcpy(fn_name,next_name);
216
217 maplineno++;
218 }
219
220 /* clock ticks, out of kernel text - probably modules */
221 printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
222
223 /* trailer */
224 if (optVerbose)
225 printf("%016x %-40s %6i %8.4f\n",
226 0,"total",total,total/(double)(fn_add-add0));
227 else
228 printf("%6i %-40s %8.4f\n",
229 total,"total",total/(double)(fn_add-add0));
230
231 fclose(map);
232 free(buf);
233
234 return EXIT_SUCCESS;
235}