/* $NetBSD: exec_multiboot1.c,v 1.3 2019/10/18 01:09:46 manu Exp $ */
/*
* Copyright (c) 2019 The NetBSD Foundation, Inc.
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/param.h>
#include <sys/reboot.h>
#include <i386/multiboot.h>
#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#include "loadfile.h"
#include "libi386.h"
#include "bootinfo.h"
#include "bootmod.h"
#include "vbe.h"
extern struct btinfo_modulelist *btinfo_modulelist;
void
ksyms_addr_set(void *ehdr, void *shdr, void *symbase)
{
int class;
Elf32_Ehdr *ehdr32 = NULL;
Elf64_Ehdr *ehdr64 = NULL;
uint64_t shnum;
int i;
class = ((Elf_Ehdr *)ehdr)->e_ident[EI_CLASS];
switch (class) {
case ELFCLASS32:
ehdr32 = (Elf32_Ehdr *)ehdr;
shnum = ehdr32->e_shnum;
break;
case ELFCLASS64:
ehdr64 = (Elf64_Ehdr *)ehdr;
shnum = ehdr64->e_shnum;
break;
default:
panic("Unexpected ELF class");
break;
}
for (i = 0; i < shnum; i++) {
Elf64_Shdr *shdrp64 = NULL;
Elf32_Shdr *shdrp32 = NULL;
uint64_t shtype, shaddr, shsize, shoffset;
switch(class) {
case ELFCLASS64:
shdrp64 = &((Elf64_Shdr *)shdr)[i];
shtype = shdrp64->sh_type;
shaddr = shdrp64->sh_addr;
shsize = shdrp64->sh_size;
shoffset = shdrp64->sh_offset;
break;
case ELFCLASS32:
shdrp32 = &((Elf32_Shdr *)shdr)[i];
shtype = shdrp32->sh_type;
shaddr = shdrp32->sh_addr;
shsize = shdrp32->sh_size;
shoffset = shdrp32->sh_offset;
break;
default:
panic("Unexpected ELF class");
break;
}
if (shtype != SHT_SYMTAB && shtype != SHT_STRTAB)
continue;
if (shaddr != 0 || shsize == 0)
continue;
shaddr = (uint64_t)(uintptr_t)(symbase + shoffset);
switch(class) {
case ELFCLASS64:
shdrp64->sh_addr = shaddr;
break;
case ELFCLASS32:
shdrp32->sh_addr = shaddr;
break;
default:
panic("Unexpected ELF class");
break;
}
}
return;
}
static int
exec_multiboot1(struct multiboot_package *mbp)
{
struct multiboot_info *mbi;
struct multiboot_module *mbm;
int i, len;
char *cmdline;
struct bi_modulelist_entry *bim;
mbi = alloc(sizeof(struct multiboot_info));
mbi->mi_flags = MULTIBOOT_INFO_HAS_MEMORY;
mbi->mi_mem_upper = mbp->mbp_extmem;
mbi->mi_mem_lower = mbp->mbp_basemem;
if (mbp->mbp_args) {
mbi->mi_flags |= MULTIBOOT_INFO_HAS_CMDLINE;
len = strlen(mbp->mbp_file) + 1 + strlen(mbp->mbp_args) + 1;
cmdline = alloc(len);
snprintf(cmdline, len, "%s %s", mbp->mbp_file, mbp->mbp_args);
mbi->mi_cmdline = (char *) vtophys(cmdline);
}
/* pull in any modules if necessary */
if (btinfo_modulelist) {
mbm = alloc(sizeof(struct multiboot_module) *
btinfo_modulelist->num);
bim = (struct bi_modulelist_entry *)
(((char *) btinfo_modulelist) +
sizeof(struct btinfo_modulelist));
for (i = 0; i < btinfo_modulelist->num; i++) {
mbm[i].mmo_start = bim->base;
mbm[i].mmo_end = bim->base + bim->len;
mbm[i].mmo_string = (char *)vtophys(bim->path);
mbm[i].mmo_reserved = 0;
bim++;
}
mbi->mi_flags |= MULTIBOOT_INFO_HAS_MODS;
mbi->mi_mods_count = btinfo_modulelist->num;
mbi->mi_mods_addr = vtophys(mbm);
}
if (mbp->mbp_marks[MARK_SYM] != 0) {
Elf32_Ehdr ehdr;
void *shbuf;
size_t shlen;
u_long shaddr;
pvbcopy((void *)mbp->mbp_marks[MARK_SYM], &ehdr, sizeof(ehdr));
if (memcmp(&ehdr.e_ident, ELFMAG, SELFMAG) != 0)
goto skip_ksyms;
shaddr = mbp->mbp_marks[MARK_SYM] + ehdr.e_shoff;
shlen = ehdr.e_shnum * ehdr.e_shentsize;
shbuf = alloc(shlen);
pvbcopy((void *)shaddr, shbuf, shlen);
ksyms_addr_set(&ehdr, shbuf,
(void *)(KERNBASE + mbp->mbp_marks[MARK_SYM]));
vpbcopy(shbuf, (void *)shaddr, shlen);
dealloc(shbuf, shlen);
mbi->mi_elfshdr_num = ehdr.e_shnum;
mbi->mi_elfshdr_size = ehdr.e_shentsize;
mbi->mi_elfshdr_addr = shaddr;
mbi->mi_elfshdr_shndx = ehdr.e_shstrndx;
mbi->mi_flags |= MULTIBOOT_INFO_HAS_ELF_SYMS;
}
skip_ksyms:
#ifdef DEBUG
printf("Start @ 0x%lx [%ld=0x%lx-0x%lx]...\n",
mbp->mbp_marks[MARK_ENTRY],
mbp->mbp_marks[MARK_NSYM],
mbp->mbp_marks[MARK_SYM],
mbp->mbp_marks[MARK_END]);
#endif
/* Does not return */
multiboot(mbp->mbp_marks[MARK_ENTRY], vtophys(mbi),
x86_trunc_page(mbi->mi_mem_lower * 1024), MULTIBOOT_INFO_MAGIC);
return 0;
}
static void
cleanup_multiboot1(struct multiboot_package *mbp)
{
dealloc(mbp->mbp_header, sizeof(*mbp->mbp_header));
dealloc(mbp, sizeof(*mbp));
return;
}
struct multiboot_package *
probe_multiboot1(const char *path)
{
int fd = -1;
size_t i;
char buf[8192 + sizeof(struct multiboot_header)];
ssize_t readen;
struct multiboot_package *mbp = NULL;
if ((fd = open(path, 0)) == -1)
goto out;
readen = read(fd, buf, sizeof(buf));
if (readen < sizeof(struct multiboot_header))
goto out;
for (i = 0; i < readen; i += 4) {
struct multiboot_header *mbh;
mbh = (struct multiboot_header *)(buf + i);
if (mbh->mh_magic != MULTIBOOT_HEADER_MAGIC)
continue;
if (mbh->mh_magic + mbh->mh_flags + mbh->mh_checksum)
continue;
mbp = alloc(sizeof(*mbp));
mbp->mbp_version = 1;
mbp->mbp_file = path;
mbp->mbp_header = alloc(sizeof(*mbp->mbp_header));
mbp->mbp_probe = *probe_multiboot1;
mbp->mbp_exec = *exec_multiboot1;
mbp->mbp_cleanup = *cleanup_multiboot1;
memcpy(mbp->mbp_header, mbh, sizeof(*mbp->mbp_header));
goto out;
}
out:
if (fd != -1)
close(fd);
return mbp;
}