minix/lib/libc/gen/nlist_ecoff.c

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/* $NetBSD: nlist_ecoff.c,v 1.23 2012/03/20 00:31:24 matt Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou
* 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 for the
* NetBSD Project. See http://www.NetBSD.org/ for
* information about NetBSD.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: nlist_ecoff.c,v 1.23 2012/03/20 00:31:24 matt Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include "nlist_private.h"
#ifdef NLIST_ECOFF
#include <sys/exec_ecoff.h>
#endif
#ifdef NLIST_ECOFF
#define check(off, size) \
((size_t)off >= mappedsize || (size_t)(off + size) > mappedsize)
int
__fdnlist_ecoff(int fd, struct nlist *list)
{
struct nlist *p;
const struct ecoff_exechdr *exechdrp;
const struct ecoff_symhdr *symhdrp;
const struct ecoff_extsym *esyms;
struct stat st;
const char *mappedfile;
size_t mappedsize;
u_long symhdroff, extstroff;
u_int symhdrsize;
int rv, nent;
long i, nesyms;
_DIAGASSERT(fd != -1);
_DIAGASSERT(list != NULL);
rv = -1;
/*
* If we can't fstat() the file, something bad is going on.
*/
if (fstat(fd, &st) < 0)
goto out;
/*
* Map the file in its entirety.
*/
if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) {
errno = EFBIG;
goto out;
}
mappedsize = (size_t)st.st_size;
mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
fd, 0);
if (mappedfile == MAP_FAILED)
goto out;
/*
* Make sure we can access the executable's header
* directly, and make sure the recognize the executable
* as an ECOFF binary.
*/
if (check(0, sizeof *exechdrp))
goto unmap;
exechdrp = (const void *)mappedfile;
if (ECOFF_BADMAG(exechdrp))
goto unmap;
/*
* Find the symbol list.
*/
symhdroff = exechdrp->f.f_symptr;
symhdrsize = exechdrp->f.f_nsyms;
if ((symhdroff + sizeof *symhdrp) > mappedsize ||
sizeof *symhdrp != symhdrsize)
goto unmap;
symhdrp = (const void *)&mappedfile[symhdroff];
nesyms = symhdrp->esymMax;
if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms))
goto unmap;
esyms = (const void *)&mappedfile[symhdrp->cbExtOffset];
extstroff = symhdrp->cbSsExtOffset;
/*
* Clean out any left-over information for all valid entries.
* Type and value are 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++) {
const char *nlistname;
const char *symtabname;
/* This may be incorrect */
nlistname = N_NAME(p);
if (*nlistname == '_')
nlistname++;
symtabname =
&mappedfile[extstroff + esyms[i].es_strindex];
if (!strcmp(symtabname, nlistname)) {
/*
* Translate (roughly) from ECOFF to nlist
*/
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)
goto done;
break; /* into next run of outer loop */
}
}
}
done:
rv = nent;
unmap:
munmap(__UNCONST(mappedfile), mappedsize);
out:
return rv;
}
#endif /* NLIST_ECOFF */