freebsd-skq/usr.bin/symorder/symorder.c

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/*
* Copyright (c) 1980 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
char const copyright[] =
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"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
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static char sccsid[] = "@(#)symorder.c 5.8 (Berkeley) 4/1/91";
#endif
static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
/*
* symorder - reorder symbol table
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <a.out.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#define SPACE 500
#define OKEXIT 0
#define NOTFOUNDEXIT 1
#define ERREXIT 2
char *exclude[SPACE];
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struct nlist order[SPACE];
struct exec exec;
struct stat stb;
struct nlist *newtab, *symtab;
off_t sa;
int nexclude, nsym, strtabsize, symfound, symkept, small, missing, clean;
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char *kfile, *newstrings, *strings, asym[BUFSIZ];
void badfmt __P((char *));
int excluded __P((struct nlist *));
int inlist __P((struct nlist *));
void reorder __P((struct nlist *, struct nlist *, int));
int savesymb __P((struct nlist *));
static void usage __P((void));
int
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main(argc, argv)
int argc;
char **argv;
{
register struct nlist *p, *symp;
register FILE *f, *xfile;
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register int i;
register char *start, *t, *xfilename;
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int ch, n, o;
xfilename = NULL;
while ((ch = getopt(argc, argv, "cmtx:")) != -1)
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switch(ch) {
case 'c':
clean = 1;
break;
case 'm':
missing = 1;
break;
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case 't':
small = 1;
break;
case 'x':
if (xfilename != NULL)
usage();
xfilename = optarg;
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break;
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case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
if ((f = fopen(argv[0], "r")) == NULL)
err(ERREXIT, "%s", argv[0]);
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for (p = order; fgets(asym, sizeof(asym), f) != NULL;) {
for (t = asym; isspace(*t); ++t);
if (!*(start = t))
continue;
while (*++t);
if (*--t == '\n')
*t = '\0';
p->n_un.n_name = strdup(start);
++p;
if (++nsym >= sizeof order / sizeof order[0])
break;
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}
(void)fclose(f);
if (xfilename != NULL) {
if ((xfile = fopen(xfilename, "r")) == NULL)
err(ERREXIT, "%s", xfilename);
for (; fgets(asym, sizeof(asym), xfile) != NULL;) {
for (t = asym; isspace(*t); ++t);
if (!*(start = t))
continue;
while (*++t);
if (*--t == '\n')
*t = '\0';
exclude[nexclude] = strdup(start);
if (++nexclude >= sizeof exclude / sizeof exclude[0])
break;
}
(void)fclose(xfile);
}
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kfile = argv[1];
if ((f = fopen(kfile, "r")) == NULL)
err(ERREXIT, "%s", kfile);
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if ((o = open(kfile, O_WRONLY)) < 0)
err(ERREXIT, "%s", kfile);
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/* read exec header */
if ((fread(&exec, sizeof(exec), 1, f)) != 1)
badfmt("no exec header");
if (N_BADMAG(exec))
badfmt("bad magic number");
if (exec.a_syms == 0)
badfmt("stripped");
(void)fstat(fileno(f), &stb);
if (stb.st_size < N_STROFF(exec) + sizeof(off_t))
badfmt("no string table");
/* seek to and read the symbol table */
sa = N_SYMOFF(exec);
(void)fseek(f, sa, SEEK_SET);
n = exec.a_syms;
if (!(symtab = (struct nlist *)malloc(n)))
err(ERREXIT, NULL);
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if (fread((void *)symtab, 1, n, f) != n)
badfmt("corrupted symbol table");
/* read string table size and string table */
if (fread((void *)&strtabsize, sizeof(int), 1, f) != 1 ||
strtabsize <= 0)
badfmt("corrupted string table");
strings = malloc(strtabsize);
if (strings == NULL)
err(ERREXIT, NULL);
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/*
* Subtract four from strtabsize since strtabsize includes itself,
* and we've already read it.
*/
if (fread(strings, 1, strtabsize - sizeof(int), f) !=
strtabsize - sizeof(int))
badfmt("corrupted string table");
i = n / sizeof(struct nlist);
if (!clean) {
newtab = (struct nlist *)malloc(n);
if (newtab == (struct nlist *)NULL)
err(ERREXIT, NULL);
memset(newtab, 0, n);
reorder(symtab, newtab, i);
free((void *)symtab);
symtab = newtab;
} else {
symkept = i;
}
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newstrings = malloc(strtabsize);
if (newstrings == NULL)
err(ERREXIT, NULL);
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t = newstrings;
for (symp = symtab; --i >= 0; symp++) {
if (symp->n_un.n_strx == 0)
continue;
if (inlist(symp) < 0) {
if (small)
continue;
if (clean && !savesymb(symp))
symp->n_type &= ~N_EXT;
} else if (clean)
symfound++;
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symp->n_un.n_strx -= sizeof(int);
(void)strcpy(t, &strings[symp->n_un.n_strx]);
symp->n_un.n_strx = (t - newstrings) + sizeof(int);
t += strlen(t) + 1;
}
/* update shrunk sizes */
strtabsize = t - newstrings + sizeof(int);
n = symkept * sizeof(struct nlist);
/* fix exec sym size */
(void)lseek(o, (off_t)0, SEEK_SET);
exec.a_syms = n;
if (write(o, (void *)&exec, sizeof(exec)) != sizeof(exec))
err(ERREXIT, "%s", kfile);
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(void)lseek(o, sa, SEEK_SET);
if (write(o, (void *)symtab, n) != n)
err(ERREXIT, "%s", kfile);
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if (write(o, (void *)&strtabsize, sizeof(int)) != sizeof(int))
err(ERREXIT, "%s", kfile);
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if (write(o, newstrings, strtabsize - sizeof(int)) !=
strtabsize - sizeof(int))
err(ERREXIT, "%s", kfile);
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ftruncate(o, lseek(o, (off_t)0, SEEK_CUR));
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if ((i = nsym - symfound) > 0) {
(void)printf("symorder: %d symbol%s not found:\n",
i, i == 1 ? "" : "s");
for (i = 0; i < nsym; i++)
if (order[i].n_value == 0)
printf("%s\n", order[i].n_un.n_name);
if (!missing)
exit(NOTFOUNDEXIT);
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}
exit(OKEXIT);
}
int
savesymb(s)
register struct nlist *s;
{
if ((s->n_type & N_EXT) != N_EXT)
return 0;
switch (s->n_type & N_TYPE) {
case N_TEXT:
case N_DATA:
return 0;
default:
return 1;
}
}
void
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reorder(st1, st2, entries)
register struct nlist *st1, *st2;
int entries;
{
register struct nlist *p;
register int i, n;
for (p = st1, n = entries; --n >= 0; ++p)
if (inlist(p) != -1)
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++symfound;
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for (p = st2 + symfound, n = entries; --n >= 0; ++st1) {
if (excluded(st1))
continue;
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i = inlist(st1);
if (i == -1)
*p++ = *st1;
else
st2[i] = *st1;
++symkept;
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}
}
int
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inlist(p)
register struct nlist *p;
{
register char *nam;
register struct nlist *op;
if (p->n_type & N_STAB || p->n_un.n_strx == 0)
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return (-1);
if (p->n_un.n_strx < sizeof(int) || p->n_un.n_strx >= strtabsize)
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badfmt("corrupted symbol table");
nam = &strings[p->n_un.n_strx - sizeof(int)];
for (op = &order[nsym]; --op >= order; ) {
if (strcmp(op->n_un.n_name, nam) != 0)
continue;
op->n_value = 1;
return (op - order);
}
return (-1);
}
int
excluded(p)
register struct nlist *p;
{
register char *nam;
register int x;
if (p->n_type & N_STAB || p->n_un.n_strx == 0)
return (0);
if (p->n_un.n_strx < sizeof(int) || p->n_un.n_strx >= strtabsize)
badfmt("corrupted symbol table");
nam = &strings[p->n_un.n_strx - sizeof(int)];
for (x = nexclude; --x >= 0; )
if (strcmp(nam, exclude[x]) == 0)
return (1);
return (0);
}
void
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badfmt(why)
char *why;
{
errx(ERREXIT, "%s: %s: %s", kfile, why, strerror(EFTYPE));
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}
static void
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usage()
{
(void)fprintf(stderr,
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"usage: symorder [-c] [-m] [-t] [-x excludelist] symlist file\n");
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exit(ERREXIT);
}