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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2008 Magnus Damm
*
* Based on x86 implementation,
* Copyright (C) 2003-2005 Eric Biederman (ebiederm@xmission.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <elf.h>
#include "../../kexec.h"
#include "../../kexec-syscall.h"
#include "../../kexec-elf.h"
#include "../../kexec-elf-boot.h"
#include <arch/options.h>
#include "crashdump-sh.h"
#include "kexec-sh.h"
int elf_sh_probe(const char *buf, off_t len)
{
struct mem_ehdr ehdr;
int result;
result = build_elf_exec_info(buf, len, &ehdr, 0);
if (result < 0)
goto out;
/* Verify the architecuture specific bits */
if (ehdr.e_machine != EM_SH) {
result = -1;
goto out;
}
result = 0;
out:
free_elf_info(&ehdr);
return result;
}
void elf_sh_usage(void)
{
printf(" --append=STRING Set the kernel command line to STRING\n"
);
}
int elf_sh_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
struct mem_ehdr ehdr;
char *command_line;
char *modified_cmdline;
struct mem_sym sym;
int opt, rc;
static const struct option options[] = {
KEXEC_ARCH_OPTIONS
{ 0, 0, 0, 0 },
};
static const char short_options[] = KEXEC_OPT_STR "";
/*
* Parse the command line arguments
*/
command_line = modified_cmdline = 0;
while((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
switch(opt) {
default:
/* Ignore core options */
if (opt < OPT_ARCH_MAX) {
break;
}
case '?':
usage();
return -1;
case OPT_APPEND:
command_line = optarg;
break;
}
}
/* Need to append some command line parameters internally in case of
* taking crash dumps.
*/
if (info->kexec_flags & (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)) {
modified_cmdline = xmalloc(COMMAND_LINE_SIZE);
memset((void *)modified_cmdline, 0, COMMAND_LINE_SIZE);
if (command_line) {
strncpy(modified_cmdline, command_line,
COMMAND_LINE_SIZE);
modified_cmdline[COMMAND_LINE_SIZE - 1] = '\0';
}
}
/* Load the ELF executable */
elf_exec_build_load(info, &ehdr, buf, len, 0);
info->entry = (void *)virt_to_phys(ehdr.e_entry);
/* If panic kernel is being loaded, additional segments need
* to be created. */
if (info->kexec_flags & (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)) {
rc = load_crashdump_segments(info, modified_cmdline);
if (rc < 0)
return -1;
/* Use new command line. */
command_line = modified_cmdline;
}
/* If we're booting a vmlinux then fill in empty_zero_page */
if (elf_rel_find_symbol(&ehdr, "empty_zero_page", &sym) == 0) {
char *zp = (void *)ehdr.e_shdr[sym.st_shndx].sh_data;
kexec_sh_setup_zero_page(zp, 4096, command_line);
}
return 0;
}
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