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