NetBSD/lib/libc/gen/nlist_coff.c

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/* $NetBSD: nlist_coff.c,v 1.4 2000/06/14 17:25:01 cgd Exp $ */
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/*
* Copyright (c) 1996 Christopher G. Demetriou
* All rights reserved.
*
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* 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.
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* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
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* 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>>
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*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: nlist_coff.c,v 1.4 2000/06/14 17:25:01 cgd Exp $");
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#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 <a.out.h> /* for 'struct nlist' declaration */
#include "nlist_private.h"
#ifdef NLIST_COFF
#include <sys/exec_coff.h>
#endif
#ifdef NLIST_COFF
#define check(off, size) ((off < 0) || (off + size > mappedsize))
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#define BAD do { rv = -1; goto out; } while (/*CONSTCOND*/0)
#define BADUNMAP do { rv = -1; goto unmap; } while (/*CONSTCOND*/0)
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#define ES_LEN 18
struct coff_extsym {
union {
char u_name[8];
struct {
int u_zero;
int u_offset;
} s;
} u;
int32_t es_value;
int16_t es_scnum;
int16_t es_type;
int8_t es_class;
int8_t es_numaux;
};
#define es_name u.u_name
#define es_zero u.s.u_zero
#define es_offset u.s.u_offset
int
__fdnlist_coff(fd, list)
int fd;
struct nlist *list;
{
struct nlist *p;
struct coff_filehdr *filehdrp;
struct stat st;
char *mappedfile;
size_t mappedsize;
u_long symoff, extstroff;
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)
BAD;
/*
* Map the file in its entirety.
*/
if (st.st_size > SIZE_T_MAX) {
errno = EFBIG;
BAD;
}
mappedsize = st.st_size;
mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
fd, 0);
if (mappedfile == (char *)-1)
BAD;
/*
* Make sure we can access the executable's header
* directly, and make sure the recognize the executable
* as an COFF binary.
*/
if (check(0, sizeof *filehdrp))
BADUNMAP;
filehdrp = (struct coff_filehdr *)&mappedfile[0];
if (COFF_BADMAG(filehdrp))
BADUNMAP;
/*
* Find the symbol list.
*/
symoff = filehdrp->f_symptr;
nesyms = filehdrp->f_nsyms;
if (check(symoff, ES_LEN * nesyms))
BADUNMAP;
extstroff = symoff + ES_LEN * nesyms;
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++) {
char *symtabname;
char *nlistname;
struct coff_extsym esym;
char name[10];
memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN);
if (esym.es_numaux != 0) {
i += esym.es_numaux; /* XXX Skip aux entry */
continue;
}
if (esym.es_zero != 0) {
memcpy(name, esym.es_name, 8);
name[8] = 0;
symtabname = name;
} else if (esym.es_offset != 0)
symtabname = &mappedfile[extstroff + esym.es_offset];
else
continue;
for (p = list; !ISLAST(p); p++) {
nlistname = p->n_un.n_name;
if (!strcmp(symtabname, nlistname)) {
/*
* Translate (roughly) from COFF to nlist
*/
p->n_value = esym.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(mappedfile, mappedsize);
out:
return (rv);
}
#endif /* NLIST_COFF */