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/* 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>.
*/
#include "libbb.h"
#include <sys/utsname.h>
#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: %i\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 %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;
}
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