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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/linker.h>
#include <string.h>
#define _MACHINE_ELF_WANT_32BIT
#include <i386/include/bootinfo.h>
#include <i386/include/elf.h>
#include <stand.h>
#include "bootstrap.h"
#include "libuserboot.h"
static int elf32_exec(struct preloaded_file *amp);
static int elf32_obj_exec(struct preloaded_file *amp);
struct file_format i386_elf = { elf32_loadfile, elf32_exec };
struct file_format i386_elf_obj = { elf32_obj_loadfile, elf32_obj_exec };
#define GUEST_STACK 0x1000 /* Initial stack base */
#define GUEST_GDT 0x3000 /* Address of initial GDT */
/*
* There is an ELF kernel and one or more ELF modules loaded.
* We wish to start executing the kernel image, so make such
* preparations as are required, and do so.
*/
static int
elf32_exec(struct preloaded_file *fp)
{
struct file_metadata *md;
Elf_Ehdr *ehdr;
vm_offset_t entry, bootinfop, modulep, kernend;
int boothowto, err, bootdev;
uint32_t stack[1024], *sp;
if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
return(EFTYPE);
ehdr = (Elf_Ehdr *)&(md->md_data);
err = bi_load32(fp->f_args, &boothowto, &bootdev, &bootinfop, &modulep, &kernend);
if (err != 0)
return(err);
entry = ehdr->e_entry & 0xffffff;
#ifdef DEBUG
printf("Start @ 0x%lx ...\n", entry);
#endif
dev_cleanup();
/*
* Build a scratch stack at physical 0x1000
*/
memset(stack, 0, sizeof(stack));
sp = (uint32_t *)((char *)stack + sizeof(stack));
*--sp = kernend;
*--sp = modulep;
*--sp = bootinfop;
*--sp = 0;
*--sp = 0;
*--sp = 0;
*--sp = bootdev;
*--sp = boothowto;
/*
* Fake return address to mimic "new" boot blocks. For more
* details see recover_bootinfo in locore.S.
*/
*--sp = 0xbeefface;
CALLBACK(copyin, stack, GUEST_STACK, sizeof(stack));
CALLBACK(setreg, 4, (char *)sp - (char *)stack + GUEST_STACK);
CALLBACK(setgdt, GUEST_GDT, 8 * 4 - 1);
CALLBACK(exec, entry);
panic("exec returned");
}
static int
elf32_obj_exec(struct preloaded_file *fp)
{
return (EFTYPE);
}
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