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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: stable/9/sys/boot/userboot/userboot/elf32_freebsd.c 223695 2011-06-30 16:08:56Z dfr $");
29
30 #include <sys/param.h>
31 #include <sys/exec.h>
32 #include <sys/linker.h>
33 #include <string.h>
34 #include <i386/include/bootinfo.h>
35 #include <i386/include/elf.h>
36 #include <stand.h>
37
38 #include "bootstrap.h"
39 #include "libuserboot.h"
40
41 static int elf32_exec(struct preloaded_file *amp);
42 static int elf32_obj_exec(struct preloaded_file *amp);
43
44 struct file_format i386_elf = { elf32_loadfile, elf32_exec };
45 struct file_format i386_elf_obj = { elf32_obj_loadfile, elf32_obj_exec };
46
47 /*
48 * There is an ELF kernel and one or more ELF modules loaded.
49 * We wish to start executing the kernel image, so make such
50 * preparations as are required, and do so.
51 */
52 static int
elf32_exec(struct preloaded_file * fp)53 elf32_exec(struct preloaded_file *fp)
54 {
55 struct file_metadata *md;
56 Elf_Ehdr *ehdr;
57 vm_offset_t entry, bootinfop, modulep, kernend;
58 int boothowto, err, bootdev;
59 uint32_t stack[1024];
60
61
62 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
63 return(EFTYPE);
64 ehdr = (Elf_Ehdr *)&(md->md_data);
65
66 err = bi_load32(fp->f_args, &boothowto, &bootdev, &bootinfop, &modulep, &kernend);
67 if (err != 0)
68 return(err);
69 entry = ehdr->e_entry & 0xffffff;
70
71 #ifdef DEBUG
72 printf("Start @ 0x%lx ...\n", entry);
73 #endif
74
75 dev_cleanup();
76
77 /*
78 * Build a scratch stack at physical 0x1000
79 */
80 stack[0] = boothowto;
81 stack[1] = bootdev;
82 stack[2] = 0;
83 stack[3] = 0;
84 stack[4] = 0;
85 stack[5] = bootinfop;
86 stack[6] = modulep;
87 stack[7] = kernend;
88 CALLBACK(copyin, stack, 0x1000, sizeof(stack));
89 CALLBACK(setreg, 4, 0x1000);
90 CALLBACK(exec, entry);
91
92 panic("exec returned");
93 }
94
95 static int
elf32_obj_exec(struct preloaded_file * fp)96 elf32_obj_exec(struct preloaded_file *fp)
97 {
98 return (EFTYPE);
99 }
100