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/*
* ARM64 kexec zImage (Image.gz) support.
*
* Several distros use 'make zinstall' rule inside
* 'arch/arm64/boot/Makefile' to install the arm64
* Image.gz compressed file inside the boot destination
* directory (for e.g. /boot).
*
* Currently we cannot use kexec_file_load() to load vmlinuz
* (or Image.gz).
*
* To support Image.gz, we should:
* a). Copy the contents of Image.gz to a temporary file.
* b). Decompress (gunzip-decompress) the contents inside the
* temporary file.
* c). Pass the 'fd' of the temporary file to the kernel space.
*
* So basically the kernel space still gets a decompressed
* kernel image to load via kexec-tools.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include "crashdump-arm64.h"
#include "image-header.h"
#include "kexec.h"
#include "kexec-arm64.h"
#include "kexec-syscall.h"
#include "kexec-zlib.h"
#include "arch/options.h"
#define FILENAME_IMAGE "/tmp/ImageXXXXXX"
/* Returns:
* -1 : in case of error/invalid format (not a valid Image.gz format.
* fd : File descriptor of the temp file containing the decompressed
* Image.
*/
int zImage_arm64_probe(const char *kernel_buf, off_t kernel_size)
{
int ret = -1;
int fd = 0;
int kernel_fd = 0;
char *fname = NULL;
char *kernel_uncompressed_buf = NULL;
const struct arm64_image_header *h;
if (!is_zlib_file(kernel_buf, &kernel_size)) {
dbgprintf("%s: Not an zImage file (Image.gz).\n", __func__);
return -1;
}
if (!(fname = strdup(FILENAME_IMAGE))) {
dbgprintf("%s: Can't duplicate strings %s\n", __func__,
fname);
return -1;
}
if ((fd = mkstemp(fname)) < 0) {
dbgprintf("%s: Can't open file %s\n", __func__,
fname);
ret = -1;
goto fail_mkstemp;
}
kernel_uncompressed_buf =
(char *) calloc(kernel_size, sizeof(off_t));
if (!kernel_uncompressed_buf) {
dbgprintf("%s: Can't calloc %ld bytes\n",
__func__, kernel_size);
ret= -ENOMEM;
goto fail_calloc;
}
/* slurp in the input kernel */
dbgprintf("%s: ", __func__);
kernel_uncompressed_buf = slurp_decompress_file(kernel_buf,
&kernel_size);
/* check for correct header magic */
if (kernel_size < sizeof(struct arm64_image_header)) {
dbgprintf("%s: No arm64 image header.\n", __func__);
ret = -1;
goto fail_bad_header;
}
h = (const struct arm64_image_header *)(kernel_uncompressed_buf);
if (!arm64_header_check_magic(h)) {
dbgprintf("%s: Bad arm64 image header.\n", __func__);
ret = -1;
goto fail_bad_header;
}
if (write(fd, kernel_uncompressed_buf,
kernel_size) != kernel_size) {
dbgprintf("%s: Can't write the uncompressed file %s\n",
__func__, fname);
ret = -1;
goto fail_bad_header;
}
close(fd);
/* Open the tmp file again, this time in O_RDONLY mode, as
* opening the file in O_RDWR and calling kexec_file_load()
* causes the kernel to return -ETXTBSY
*/
kernel_fd = open(fname, O_RDONLY);
if (kernel_fd == -1) {
dbgprintf("%s: Failed to open file %s\n",
__func__, fname);
ret = -1;
goto fail_bad_header;
}
unlink(fname);
free(kernel_uncompressed_buf);
free(fname);
return kernel_fd;
fail_bad_header:
free(kernel_uncompressed_buf);
fail_calloc:
if (fd >= 0)
close(fd);
unlink(fname);
fail_mkstemp:
free(fname);
return ret;
}
int zImage_arm64_load(int argc, char **argv, const char *kernel_buf,
off_t kernel_size, struct kexec_info *info)
{
const struct arm64_image_header *header;
unsigned long kernel_segment;
int result;
if (info->file_mode) {
if (arm64_opts.initrd) {
info->initrd_fd = open(arm64_opts.initrd, O_RDONLY);
if (info->initrd_fd == -1) {
fprintf(stderr,
"Could not open initrd file %s:%s\n",
arm64_opts.initrd, strerror(errno));
result = EFAILED;
goto exit;
}
}
if (arm64_opts.command_line) {
info->command_line = (char *)arm64_opts.command_line;
info->command_line_len =
strlen(arm64_opts.command_line) + 1;
}
return 0;
}
header = (const struct arm64_image_header *)(kernel_buf);
if (arm64_process_image_header(header))
return EFAILED;
kernel_segment = arm64_locate_kernel_segment(info);
if (kernel_segment == ULONG_MAX) {
dbgprintf("%s: Kernel segment is not allocated\n", __func__);
result = EFAILED;
goto exit;
}
dbgprintf("%s: kernel_segment: %016lx\n", __func__, kernel_segment);
dbgprintf("%s: text_offset: %016lx\n", __func__,
arm64_mem.text_offset);
dbgprintf("%s: image_size: %016lx\n", __func__,
arm64_mem.image_size);
dbgprintf("%s: phys_offset: %016lx\n", __func__,
arm64_mem.phys_offset);
dbgprintf("%s: vp_offset: %016lx\n", __func__,
arm64_mem.vp_offset);
dbgprintf("%s: PE format: %s\n", __func__,
(arm64_header_check_pe_sig(header) ? "yes" : "no"));
/* create and initialize elf core header segment */
if (info->kexec_flags & KEXEC_ON_CRASH) {
result = load_crashdump_segments(info);
if (result) {
dbgprintf("%s: Creating eflcorehdr failed.\n",
__func__);
goto exit;
}
}
/* load the kernel */
add_segment_phys_virt(info, kernel_buf, kernel_size,
kernel_segment + arm64_mem.text_offset,
arm64_mem.image_size, 0);
/* load additional data */
result = arm64_load_other_segments(info, kernel_segment
+ arm64_mem.text_offset);
exit:
if (result)
fprintf(stderr, "kexec: load failed.\n");
return result;
}
void zImage_arm64_usage(void)
{
printf(
" An ARM64 zImage, compressed, big or little endian.\n"
" Typically an Image.gz or Image.lzma file.\n\n");
}
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