elf64_freebsd.c revision 39943 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$Id: elf_freebsd.c,v 1.3 1998/10/02 20:53:17 msmith Exp $
27 */
28
29#include <sys/param.h>
30#include <sys/exec.h>
31#include <sys/reboot.h>
32#include <sys/linker.h>
33#include <string.h>
34#include <machine/bootinfo.h>
35#include <machine/elf.h>
36#include <stand.h>
37
38#include "bootstrap.h"
39#include "libi386.h"
40#include "btxv86.h"
41
42static int	elf_exec(struct loaded_module *amp);
43
44struct module_format i386_elf = { elf_loadmodule, elf_exec };
45
46static struct bootinfo	bi;
47
48/*
49 * There is an a.out kernel and one or more a.out modules loaded.
50 * We wish to start executing the kernel image, so make such
51 * preparations as are required, and do so.
52 */
53static int
54elf_exec(struct loaded_module *mp)
55{
56    struct module_metadata	*md;
57    Elf_Ehdr 			*ehdr;
58    vm_offset_t			entry, bootinfop;
59    int				boothowto, err, bootdev;
60    struct bootinfo		*bi;
61    vm_offset_t			ssym, esym;
62
63    if ((md = mod_findmetadata(mp, MODINFOMD_ELFHDR)) == NULL)
64	return(EFTYPE);			/* XXX actually EFUCKUP */
65    ehdr = (Elf_Ehdr *)&(md->md_data);
66
67    /* XXX allow override? */
68    setenv("kernelname", mp->m_name, 1);
69
70    if ((err = bi_load(mp->m_args, &boothowto, &bootdev, &bootinfop)) != 0)
71	return(err);
72    entry = ehdr->e_entry & 0xffffff;
73
74    ssym = esym = 0;
75    if ((md = mod_findmetadata(mp, MODINFOMD_ELFSSYM)) != NULL)
76	ssym = *((vm_offset_t *)&(md->md_data));
77    if ((md = mod_findmetadata(mp, MODINFOMD_ELFESYM)) != NULL)
78	esym = *((vm_offset_t *)&(md->md_data));
79    if (ssym == 0 || esym == 0)
80	ssym = esym = 0;		/* sanity */
81
82    bi = (struct bootinfo *)PTOV(bootinfop);
83    bi->bi_symtab = ssym;
84    bi->bi_esymtab = esym;
85
86
87#ifdef DEBUG
88    printf("Start @ 0x%lx ...\n", entry);
89#endif
90
91    __exec((void *)entry, boothowto, bootdev, 0, 0, 0, bootinfop);
92
93    panic("exec returned");
94}
95