diff options
Diffstat (limited to 'kexec/arch/mips/kexec-elf-mips.c')
| -rw-r--r-- | kexec/arch/mips/kexec-elf-mips.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/kexec/arch/mips/kexec-elf-mips.c b/kexec/arch/mips/kexec-elf-mips.c new file mode 100644 index 0000000..8220829 --- /dev/null +++ b/kexec/arch/mips/kexec-elf-mips.c @@ -0,0 +1,183 @@ +/* + * kexec-elf-mips.c - kexec Elf loader for mips + * Copyright (C) 2007 Francesco Chiechi, Alessandro Rubini + * Copyright (C) 2007 Tvblob s.r.l. + * + * derived from ../ppc/kexec-elf-ppc.c + * Copyright (C) 2004 Albert Herranz + * + * 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 <sys/mman.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-mips.h" +#include <arch/options.h> + +static const int probe_debug = 0; + +#define BOOTLOADER "kexec" +#define MAX_COMMAND_LINE 256 + +#define UPSZ(X) ((sizeof(X) + 3) & ~3) +static struct boot_notes { + Elf_Bhdr hdr; + Elf_Nhdr bl_hdr; + unsigned char bl_desc[UPSZ(BOOTLOADER)]; + Elf_Nhdr blv_hdr; + unsigned char blv_desc[UPSZ(BOOTLOADER_VERSION)]; + Elf_Nhdr cmd_hdr; + unsigned char command_line[0]; +} elf_boot_notes = { + .hdr = { + .b_signature = 0x0E1FB007, + .b_size = sizeof(elf_boot_notes), + .b_checksum = 0, + .b_records = 3, + }, + .bl_hdr = { + .n_namesz = 0, + .n_descsz = sizeof(BOOTLOADER), + .n_type = EBN_BOOTLOADER_NAME, + }, + .bl_desc = BOOTLOADER, + .blv_hdr = { + .n_namesz = 0, + .n_descsz = sizeof(BOOTLOADER_VERSION), + .n_type = EBN_BOOTLOADER_VERSION, + }, + .blv_desc = BOOTLOADER_VERSION, + .cmd_hdr = { + .n_namesz = 0, + .n_descsz = 0, + .n_type = EBN_COMMAND_LINE, + }, +}; + + +#define OPT_APPEND (OPT_ARCH_MAX+0) + +int elf_mips_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_MIPS) { + /* for a different architecture */ + if (probe_debug) { + fprintf(stderr, "Not for this architecture.\n"); + } + result = -1; + goto out; + } + result = 0; + out: + free_elf_info(&ehdr); + return result; +} + +void elf_mips_usage(void) +{ + printf(" --command-line=STRING Set the kernel command line to " + "STRING.\n" + " --append=STRING Set the kernel command line to " + "STRING.\n"); +} + +int elf_mips_load(int argc, char **argv, const char *buf, off_t len, + struct kexec_info *info) +{ + struct mem_ehdr ehdr; + char *arg_buf; + size_t arg_bytes; + unsigned long arg_base; + struct boot_notes *notes; + size_t note_bytes; + const char *command_line; + int command_line_len; + unsigned char *setup_start; + uint32_t setup_size; + int opt; + static const struct option options[] = { + KEXEC_ARCH_OPTIONS + {"command-line", 1, 0, OPT_APPEND}, + {"append", 1, 0, OPT_APPEND}, + {0, 0, 0, 0}, + }; + + static const char short_options[] = KEXEC_ARCH_OPT_STR "d"; + + command_line = 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; + } + } + command_line_len = 0; + setup_simple_regs.spr9 = 0; + if (command_line) { + command_line_len = strlen(command_line) + 1; + setup_simple_regs.spr9 = 2; + } + + /* Load the ELF executable */ + elf_exec_build_load(info, &ehdr, buf, len, 0); + + setup_start = setup_simple_start; + setup_size = setup_simple_size; + setup_simple_regs.spr8 = ehdr.e_entry; + + note_bytes = sizeof(elf_boot_notes) + ((command_line_len + 3) & ~3); + arg_bytes = note_bytes + ((setup_size + 3) & ~3); + + arg_buf = xmalloc(arg_bytes); + arg_base = add_buffer_virt(info, + arg_buf, arg_bytes, arg_bytes, 4, 0, elf_max_addr(&ehdr), 1); + + notes = (struct boot_notes *)(arg_buf + ((setup_size + 3) & ~3)); + + memcpy(arg_buf, setup_start, setup_size); + memcpy(notes, &elf_boot_notes, sizeof(elf_boot_notes)); + memcpy(notes->command_line, command_line, command_line_len); + + notes->hdr.b_size = note_bytes; + notes->cmd_hdr.n_descsz = command_line_len; + notes->hdr.b_checksum = compute_ip_checksum(notes, note_bytes); + + info->entry = (void *)arg_base; + + return 0; +} + |