1/*	$NetBSD: bin_nlist.c,v 1.1 2016/09/21 16:25:41 christos Exp $	*/
2
3/*
4 * Copyright (c) 1996, 2002 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
30 */
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: bin_nlist.c,v 1.1 2016/09/21 16:25:41 christos Exp $");
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <nlist.h>
38#include <err.h>
39
40#include "bin.h"
41#include "extern.h"
42
43struct bininfo {
44	const char *fname;
45	int kfd;
46};
47
48#define X_MD_ROOT_IMAGE 0
49#define X_MD_ROOT_SIZE 1
50
51struct {
52	const char *name;
53	int	(*check)(const char *, size_t);
54	int	(*findoff)(const char *, size_t, u_long, size_t *, u_long);
55} exec_formats[] = {
56#ifdef NLIST_AOUT
57	{	"a.out",	check_aout,	findoff_aout,	},
58#endif
59#ifdef NLIST_ECOFF
60	{	"ECOFF",	check_ecoff,	findoff_ecoff,	},
61#endif
62#ifdef NLIST_ELF32
63	{	"ELF32",	check_elf32,	findoff_elf32,	},
64#endif
65#ifdef NLIST_ELF64
66	{	"ELF64",	check_elf64,	findoff_elf64,	},
67#endif
68#ifdef NLIST_COFF
69	{	"COFF",		check_coff,	findoff_coff,	},
70#endif
71};
72
73void *
74bin_open(int kfd, const char *kfile, const char *bfdname)
75{
76	struct bininfo *bin;
77
78	if ((bin = malloc(sizeof(*bin))) == NULL) {
79		warn("%s", kfile);
80		return NULL;
81	}
82	bin->kfd = kfd;
83	bin->fname = kfile;
84
85	return bin;
86}
87
88
89int
90bin_find_md_root(void *binp, const char *mappedfile, off_t mappedsize,
91    unsigned long text_start, const char *root_name, const char *size_name,
92    size_t *md_root_image_offset, size_t *md_root_size_offset,
93    uint32_t *md_root_size, int verbose)
94{
95	struct bininfo *bin = binp;
96	struct nlist nl[3];
97	size_t i, n = sizeof exec_formats / sizeof exec_formats[0];
98
99	for (i = 0; i < n; i++) {
100		if ((*exec_formats[i].check)(mappedfile, mappedsize) == 0)
101			break;
102	}
103	if (i == n) {
104		warnx("%s: unknown executable format", bin->fname);
105		return 1;
106	}
107
108	if (verbose) {
109		fprintf(stderr, "%s is an %s binary\n", bin->fname,
110		    exec_formats[i].name);
111#ifdef NLIST_AOUT
112		if (text_start != (unsigned long)~0)
113			fprintf(stderr, "kernel text loads at 0x%lx\n",
114			    text_start);
115#endif
116	}
117
118	(void)memset(nl, 0, sizeof(nl));
119	N_NAME(&nl[X_MD_ROOT_IMAGE]) = root_name;
120	N_NAME(&nl[X_MD_ROOT_SIZE]) = size_name;
121
122	if (__fdnlist(bin->kfd, nl) != 0)
123		return 1;
124
125	if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
126	    nl[1].n_value, md_root_size_offset, text_start) != 0) {
127		warnx("couldn't find offset for %s in %s",
128		    nl[X_MD_ROOT_SIZE].n_name, bin->fname);
129		return 1;
130	}
131	if (verbose)
132		fprintf(stderr, "%s is at offset %#zx in %s\n",
133		    nl[X_MD_ROOT_SIZE].n_name, *md_root_size_offset,
134		    bin->fname);
135	memcpy(md_root_size, &mappedfile[*md_root_size_offset],
136	    sizeof(*md_root_size));
137	if (verbose)
138		fprintf(stderr, "%s has value %#x\n",
139		    nl[X_MD_ROOT_SIZE].n_name, *md_root_size);
140
141	if ((*exec_formats[i].findoff)(mappedfile, mappedsize,
142	    nl[0].n_value, md_root_image_offset, text_start) != 0) {
143		warnx("couldn't find offset for %s in %s",
144		    nl[X_MD_ROOT_IMAGE].n_name, bin->fname);
145		return 1;
146	}
147	if (verbose)
148		fprintf(stderr, "%s is at offset %#zx in %s\n",
149			nl[X_MD_ROOT_IMAGE].n_name,
150			*md_root_image_offset, bin->fname);
151
152	return 0;
153}
154
155void
156bin_put_32(void *bin, off_t size, char *buf)
157{
158	uint32_t s = (uint32_t)size;
159	memcpy(buf, &s, sizeof(s));
160}
161
162void
163bin_close(void *bin)
164{
165}
166
167const char **
168bin_supported_targets(void)
169{
170	static const char *fmts[] = {
171#ifdef NLIST_AOUT
172		"aout",
173#endif
174#ifdef NLIST_ECOFF
175		"ecoff",
176#endif
177#ifdef NLIST_ELF32
178		"elf32",
179#endif
180#ifdef NLIST_ELF64
181		"elf64",
182#endif
183#ifdef NLIST_COFF
184		"coff",
185#endif
186		NULL,
187	};
188
189	return fmts;
190}
191