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/*
* kexec-elf-hppa.c - kexec Elf loader for hppa
*
* Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <elf.h>
#include <boot/elf_boot.h>
#include <ip_checksum.h>
#include "../../kexec.h"
#include "../../kexec-elf.h"
#include "../../kexec-syscall.h"
#include "kexec-hppa.h"
#include <arch/options.h>
#define PAGE_SIZE 4096
extern unsigned long phys_offset;
int elf_hppa_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;
phys_offset = ehdr.e_entry & 0xf0000000;
/* Verify the architecuture specific bits */
if (ehdr.e_machine != EM_PARISC) {
/* for a different architecture */
fprintf(stderr, "Not for this architecture.\n");
result = -1;
goto out;
}
result = 0;
out:
free_elf_info(&ehdr);
return result;
}
void elf_hppa_usage(void)
{
printf(" --command-line=STRING Set the kernel command line to STRING\n"
" --append=STRING Set the kernel command line to STRING\n"
" --reuse-cmdline Use kernel command line from running system.\n"
" --ramdisk=FILE Use FILE as the kernel's initial ramdisk.\n"
" --initrd=FILE Use FILE as the kernel's initial ramdisk.\n"
);
}
int elf_hppa_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
struct mem_ehdr ehdr;
char *cmdline = NULL, *ramdisk = NULL;
int opt, result, i;
unsigned long ramdisk_addr = 0;
off_t ramdisk_size = 0;
static const struct option options[] = {
KEXEC_ALL_OPTIONS
{ 0, 0, NULL, 0 },
};
static const char short_options[] = KEXEC_ALL_OPT_STR;
while ((opt = getopt_long(argc, argv, short_options, options, 0)) !=
-1) {
switch (opt) {
default:
/* Ignore core options */
if (opt < OPT_ARCH_MAX)
break;
case OPT_APPEND:
cmdline = strdup(optarg);
break;
case OPT_REUSE_CMDLINE:
cmdline = get_command_line();
break;
case OPT_RAMDISK:
ramdisk = optarg;
break;
}
}
if (info->file_mode) {
if (cmdline) {
info->command_line = cmdline;
info->command_line_len = strlen(cmdline) + 1;
}
if (ramdisk) {
info->initrd_fd = open(ramdisk, O_RDONLY);
if (info->initrd_fd == -1) {
fprintf(stderr, "Could not open initrd file "
"%s:%s\n", ramdisk, strerror(errno));
return -1;
}
}
return 0;
}
result = build_elf_exec_info(buf, len, &ehdr, 0);
if (result < 0)
die("ELF exec parse failed\n");
/* Fixup PT_LOAD segments that include the ELF header (offset zero) */
for (i = 0; i < ehdr.e_phnum; i++) {
struct mem_phdr *phdr;
phdr = &ehdr.e_phdr[i];
if (phdr->p_type != PT_LOAD || phdr->p_offset)
continue;
dbgprintf("Removing ELF header from segment %d\n", i);
phdr->p_paddr += PAGE_SIZE;
phdr->p_vaddr += PAGE_SIZE;
phdr->p_filesz -= PAGE_SIZE;
phdr->p_memsz -= PAGE_SIZE;
phdr->p_offset += PAGE_SIZE;
phdr->p_data += PAGE_SIZE;
}
/* Load the ELF data */
result = elf_exec_load(&ehdr, info);
if (result < 0)
die("ELF exec load failed\n");
info->entry = (void *)virt_to_phys(ehdr.e_entry);
/* Load ramdisk */
if (ramdisk) {
void *initrd = slurp_decompress_file(ramdisk, &ramdisk_size);
/* Store ramdisk at top of first memory chunk */
ramdisk_addr = _ALIGN_DOWN(info->memory_range[0].end -
ramdisk_size + 1, PAGE_SIZE);
if (!buf)
die("Ramdisk load failed\n");
add_buffer(info, initrd, ramdisk_size, ramdisk_size,
PAGE_SIZE, ramdisk_addr, info->memory_range[0].end,
1);
}
return 0;
}
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