2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/linker.h>
34 #define _MACHINE_ELF_WANT_32BIT
35 #include <i386/include/bootinfo.h>
36 #include <i386/include/elf.h>
39 #include "bootstrap.h"
40 #include "libuserboot.h"
42 static int elf32_exec(struct preloaded_file *amp);
43 static int elf32_obj_exec(struct preloaded_file *amp);
45 struct file_format i386_elf = { elf32_loadfile, elf32_exec };
46 struct file_format i386_elf_obj = { elf32_obj_loadfile, elf32_obj_exec };
48 #define GUEST_STACK 0x1000 /* Initial stack base */
49 #define GUEST_GDT 0x3000 /* Address of initial GDT */
52 * There is an ELF kernel and one or more ELF modules loaded.
53 * We wish to start executing the kernel image, so make such
54 * preparations as are required, and do so.
57 elf32_exec(struct preloaded_file *fp)
59 struct file_metadata *md;
61 vm_offset_t entry, bootinfop, modulep, kernend;
62 int boothowto, err, bootdev;
63 uint32_t stack[1024], *sp;
66 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
68 ehdr = (Elf_Ehdr *)&(md->md_data);
70 err = bi_load32(fp->f_args, &boothowto, &bootdev, &bootinfop, &modulep, &kernend);
73 entry = ehdr->e_entry & 0xffffff;
76 printf("Start @ 0x%lx ...\n", entry);
82 * Build a scratch stack at physical 0x1000
84 memset(stack, 0, sizeof(stack));
85 sp = (uint32_t *)((char *)stack + sizeof(stack));
96 * Fake return address to mimic "new" boot blocks. For more
97 * details see recover_bootinfo in locore.S.
100 CALLBACK(copyin, stack, GUEST_STACK, sizeof(stack));
101 CALLBACK(setreg, 4, (char *)sp - (char *)stack + GUEST_STACK);
103 CALLBACK(setgdt, GUEST_GDT, 8 * 4 - 1);
105 CALLBACK(exec, entry);
107 panic("exec returned");
111 elf32_obj_exec(struct preloaded_file *fp)