xref: /src/lib/libc/gen/nlist_ecoff.c

/*	$NetBSD: nlist_ecoff.c,v 1.1 1996/09/27 22:23:05 cgd Exp $	*/

/*
 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
 * Copyright (c) 1989, 1993
 *	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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)nlist.c	8.1 (Berkeley) 6/4/93";
#else
static char rcsid[] = "$NetBSD: nlist_ecoff.c,v 1.1 1996/09/27 22:23:05 cgd Exp $";
#endif
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/file.h>

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <a.out.h>			/* for 'struct nlist' declaration */

#include "nlist_private.h"
#ifdef NLIST_ECOFF
#include <sys/exec_ecoff.h>
#endif

#ifdef NLIST_ECOFF
#define	check(off, size)	((off < 0) || (off + size > mappedsize))
#define	BAD			do { rv = -1; goto out; } while (0)
#define	BADUNMAP		do { rv = -1; goto unmap; } while (0)

int
__fdnlist_is_ecoff(fd)
	int fd;
{
	struct stat st;
	struct ecoff_exechdr *exechdrp;
	char *mappedfile;
	size_t mappedsize;
	int rv = -1;

	if (fstat(fd, &st) < 0)
		BAD;
	if (st.st_size > SIZE_T_MAX) {
		errno = EFBIG;
		BAD;
	}
	mappedsize = st.st_size;
	mappedfile = mmap(NULL, mappedsize, PROT_READ, 0, fd, 0);
	if (mappedfile == (char *)-1)
		BAD;

	if (check(0, sizeof *exechdrp))
		BADUNMAP;
	exechdrp = (struct ecoff_exechdr *)&mappedfile[0];

	if (ECOFF_BADMAG(exechdrp))
		BADUNMAP;

	rv = 0;

unmap:
	munmap(mappedfile, mappedsize);
out:
	return (rv);
}

int
__fdnlist_ecoff(fd, list)
	register int fd;
	register struct nlist *list;
{
	struct nlist *p;
	struct ecoff_exechdr *exechdrp;
	struct ecoff_symhdr *symhdrp;
	struct ecoff_extsym *esyms;
	struct stat st;
	char *mappedfile;
	size_t mappedsize;
	u_long symhdroff, extstroff;
	u_int symhdrsize;
	int rv, nent;
	long i, nesyms;

	rv = -3;

	if (fstat(fd, &st) < 0)
		BAD;
	if (st.st_size > SIZE_T_MAX) {
		errno = EFBIG;
		BAD;
	}
	mappedsize = st.st_size;
	mappedfile = mmap(NULL, mappedsize, PROT_READ, 0, fd, 0);
	if (mappedfile == (char *)-1)
		BAD;

	if (check(0, sizeof *exechdrp))
		BADUNMAP;
	exechdrp = (struct ecoff_exechdr *)&mappedfile[0];

	if (ECOFF_BADMAG(exechdrp))
		BADUNMAP;

	symhdroff = exechdrp->f.f_symptr;
	symhdrsize = exechdrp->f.f_nsyms;

	if (check(symhdroff, sizeof *symhdrp) ||
	    sizeof *symhdrp != symhdrsize)
		BADUNMAP;
	symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff];

	nesyms = symhdrp->esymMax;
	if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms))
		BADUNMAP;
	esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset];
	extstroff = symhdrp->cbSsExtOffset;

	/*
	 * clean out any left-over information for all valid entries.
	 * Type and value defined to be 0 if not found; historical
	 * versions cleared other and desc as well.
	 *
	 * XXX clearing anything other than n_type and n_value violates
	 * the semantics given in the man page.
	 */
	nent = 0;
	for (p = list; !ISLAST(p); ++p) {
		p->n_type = 0;
		p->n_other = 0;
		p->n_desc = 0;
		p->n_value = 0;
		++nent;
	}

	for (i = 0; i < nesyms; i++) {
		for (p = list; !ISLAST(p); p++) {
			char *nlistname;
			char *symtabname;

			/* This may be incorrect */
			nlistname = p->n_un.n_name;
			if (*nlistname == '_')
				nlistname++;

			symtabname =
			    &mappedfile[extstroff + esyms[i].es_strindex];

			if (!strcmp(symtabname, nlistname)) {
				p->n_value = esyms[i].es_value;
				p->n_type = N_EXT;		/* XXX */
				p->n_desc = 0;			/* XXX */
				p->n_other = 0;			/* XXX */
				if (--nent <= 0)
					break;
			}
		}
	}
	rv = nent;

unmap:
	munmap(mappedfile, mappedsize);
out:
	return (rv);
}

#endif /* NLIST_ECOFF */