diff options
Diffstat (limited to 'kexec/arch/arm64/kexec-zImage-arm64.c')
| -rw-r--r-- | kexec/arch/arm64/kexec-zImage-arm64.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/kexec/arch/arm64/kexec-zImage-arm64.c b/kexec/arch/arm64/kexec-zImage-arm64.c new file mode 100644 index 00000000..6ee82ff6 --- /dev/null +++ b/kexec/arch/arm64/kexec-zImage-arm64.c @@ -0,0 +1,226 @@ +/* + * 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"); +} |