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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2004 Adam Litke (agl@us.ibm.com)
* Copyright (C) 2004 IBM Corp.
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <linux/elf.h>
#include "../../kexec.h"
#define MAX_HEADERS 32
int zImage_ppc64_probe(FILE *file)
{
Elf32_Ehdr elf;
int valid;
if (fseek(file, 0, SEEK_SET) < 0) {
fprintf(stderr, "seek error: %s\n",
strerror(errno));
return -1;
}
if (fread(&elf, sizeof(Elf32_Ehdr), 1, file) != 1) {
fprintf(stderr, "read error: %s\n",
strerror(errno));
return -1;
}
if (elf.e_machine == EM_PPC64) {
fprintf(stderr, "Elf64 not supported\n");
return -1;
}
valid = (elf.e_ident[EI_MAG0] == ELFMAG0 &&
elf.e_ident[EI_MAG1] == ELFMAG1 &&
elf.e_ident[EI_MAG2] == ELFMAG2 &&
elf.e_ident[EI_MAG3] == ELFMAG3 &&
elf.e_ident[EI_CLASS] == ELFCLASS32 &&
elf.e_ident[EI_DATA] == ELFDATA2MSB &&
elf.e_type == ET_EXEC &&
elf.e_machine == EM_PPC);
return valid ? 0 : -1;
}
int zImage_ppc64_load(FILE *file, int UNUSED(argc), char **UNUSED(argv),
void **ret_entry, struct kexec_segment **ret_segments,
int *ret_nr_segments)
{
Elf32_Ehdr elf;
Elf32_Phdr *p, *ph;
struct kexec_segment *segment;
int i;
unsigned long memsize, filesize, offset, load_loc = 0;
/* Parse command line arguments */
/* Read in the Elf32 header */
if (fseek(file, 0, SEEK_SET) < 0) {
perror("seek error:");
return -1;
}
if (fread(&elf, sizeof(Elf32_Ehdr), 1, file) != 1) {
perror("read error: ");
return -1;
}
if (elf.e_phnum > MAX_HEADERS) {
fprintf(stderr,
"Only kernels with %i program headers are supported\n",
MAX_HEADERS);
return -1;
}
/* Read the section header */
ph = (Elf32_Phdr *)malloc(sizeof(Elf32_Phdr) * elf.e_phnum);
if (ph == 0) {
perror("malloc failed: ");
return -1;
}
if (fseek(file, elf.e_phoff, SEEK_SET) < 0) {
perror("seek failed: ");
free(ph);
return -1;
}
if (fread(ph, sizeof(Elf32_Phdr) * elf.e_phnum, 1, file) != 1) {
perror("read error: ");
free(ph);
return -1;
}
*ret_segments = malloc(elf.e_phnum * sizeof(struct kexec_segment));
if (*ret_segments == 0) {
fprintf(stderr, "malloc failed: %s\n",
strerror(errno));
free(ph);
return -1;
}
segment = ret_segments[0];
/* Scan through the program header */
memsize = filesize = offset = 0;
p = ph;
for (i = 0; i < elf.e_phnum; ++i, ++p) {
if (p->p_type != PT_LOAD || p->p_offset == 0)
continue;
if (memsize == 0) {
offset = p->p_offset;
memsize = p->p_memsz;
filesize = p->p_filesz;
load_loc = p->p_vaddr;
} else {
memsize = p->p_offset + p->p_memsz - offset;
filesize = p->p_offset + p->p_filesz - offset;
}
}
if (memsize == 0) {
fprintf(stderr, "Can't find a loadable segment.\n");
free(ph);
return -1;
}
/* Load program segments */
p = ph;
segment->buf = malloc(filesize);
if (segment->buf == 0) {
perror("malloc failed: ");
free(ph);
return -1;
}
for (i = 0; i < elf.e_phnum; ++i, ++p) {
unsigned long mem_offset;
if (p->p_type != PT_LOAD || p->p_offset == 0)
continue;
/* skip to the actual image */
if (fseek(file, p->p_offset, SEEK_SET) < 0) {
perror("seek error: ");
free(ph);
return -1;
}
mem_offset = p->p_vaddr - load_loc;
if (fread((void *)segment->buf+mem_offset, p->p_filesz, 1,
file) != 1) {
perror("read error: ");
free(ph);
return -1;
}
}
segment->mem = (void *) load_loc;
segment->memsz = memsize;
segment->bufsz = filesize;
*ret_entry = (void *)(uintptr_t)elf.e_entry;
*ret_nr_segments = i - 1;
free(ph);
return 0;
}
void zImage_ppc64_usage(void)
{
fprintf(stderr, "zImage support is still broken\n");
}
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