diff options
Diffstat (limited to 'grub-core/loader/macho.c')
| -rw-r--r-- | grub-core/loader/macho.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/grub-core/loader/macho.c b/grub-core/loader/macho.c new file mode 100644 index 0000000..05710c4 --- /dev/null +++ b/grub-core/loader/macho.c @@ -0,0 +1,205 @@ +/* macho.c - load Mach-O files. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2009 Free Software Foundation, Inc. + * + * GRUB 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, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +/* This Mach-O loader is incomplete and can load only non-relocatable segments. + This is however enough to boot xnu (otool -l and Mach-O specs for more info). +*/ + +#include <grub/err.h> +#include <grub/macho.h> +#include <grub/machoload.h> +#include <grub/file.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/i18n.h> +#include <grub/dl.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +grub_err_t +grub_macho_close (grub_macho_t macho) +{ + grub_file_t file = macho->file; + + if (!macho->uncompressed32) + grub_free (macho->cmds32); + grub_free (macho->uncompressed32); + if (!macho->uncompressed64) + grub_free (macho->cmds64); + grub_free (macho->uncompressed64); + + grub_free (macho); + + if (file) + grub_file_close (file); + + return grub_errno; +} + +grub_macho_t +grub_macho_file (grub_file_t file, const char *filename, int is_64bit) +{ + grub_macho_t macho; + union grub_macho_filestart filestart; + + macho = grub_malloc (sizeof (*macho)); + if (! macho) + return 0; + + macho->file = file; + macho->offset32 = -1; + macho->offset64 = -1; + macho->end32 = -1; + macho->end64 = -1; + macho->cmds32 = 0; + macho->cmds64 = 0; + macho->uncompressed32 = 0; + macho->uncompressed64 = 0; + macho->compressed32 = 0; + macho->compressed64 = 0; + + if (grub_file_seek (macho->file, 0) == (grub_off_t) -1) + goto fail; + + if (grub_file_read (macho->file, &filestart, sizeof (filestart)) + != sizeof (filestart)) + { + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + filename); + goto fail; + } + + /* Is it a fat file? */ + if (filestart.fat.magic == grub_cpu_to_be32_compile_time (GRUB_MACHO_FAT_MAGIC)) + { + struct grub_macho_fat_arch *archs; + int i, narchs; + + /* Load architecture description. */ + narchs = grub_be_to_cpu32 (filestart.fat.nfat_arch); + if (grub_file_seek (macho->file, sizeof (struct grub_macho_fat_header)) + == (grub_off_t) -1) + goto fail; + archs = grub_calloc (narchs, sizeof (struct grub_macho_fat_arch)); + if (!archs) + goto fail; + if (grub_file_read (macho->file, archs, + sizeof (struct grub_macho_fat_arch) * narchs) + != (grub_ssize_t) sizeof(struct grub_macho_fat_arch) * narchs) + { + grub_free (archs); + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + filename); + goto fail; + } + + for (i = 0; i < narchs; i++) + { + if ((archs[i].cputype + == grub_cpu_to_be32_compile_time (GRUB_MACHO_CPUTYPE_IA32)) + && !is_64bit) + { + macho->offset32 = grub_be_to_cpu32 (archs[i].offset); + macho->end32 = grub_be_to_cpu32 (archs[i].offset) + + grub_be_to_cpu32 (archs[i].size); + } + if ((archs[i].cputype + == grub_cpu_to_be32_compile_time (GRUB_MACHO_CPUTYPE_AMD64)) + && is_64bit) + { + macho->offset64 = grub_be_to_cpu32 (archs[i].offset); + macho->end64 = grub_be_to_cpu32 (archs[i].offset) + + grub_be_to_cpu32 (archs[i].size); + } + } + grub_free (archs); + } + + /* Is it a thin 32-bit file? */ + if (filestart.thin32.magic == GRUB_MACHO_MAGIC32 && !is_64bit) + { + macho->offset32 = 0; + macho->end32 = grub_file_size (file); + } + + /* Is it a thin 64-bit file? */ + if (filestart.thin64.magic == GRUB_MACHO_MAGIC64 && is_64bit) + { + macho->offset64 = 0; + macho->end64 = grub_file_size (file); + } + + if (grub_memcmp (filestart.lzss.magic, GRUB_MACHO_LZSS_MAGIC, + sizeof (filestart.lzss.magic)) == 0 && !is_64bit) + { + macho->offset32 = 0; + macho->end32 = grub_file_size (file); + } + + /* Is it a thin 64-bit file? */ + if (grub_memcmp (filestart.lzss.magic, GRUB_MACHO_LZSS_MAGIC, + sizeof (filestart.lzss.magic)) == 0 && is_64bit) + { + macho->offset64 = 0; + macho->end64 = grub_file_size (file); + } + + grub_macho_parse32 (macho, filename); + grub_macho_parse64 (macho, filename); + + if (macho->offset32 == -1 && !is_64bit) + { + grub_error (GRUB_ERR_BAD_OS, + "Mach-O doesn't contain suitable 32-bit architecture"); + goto fail; + } + + if (macho->offset64 == -1 && is_64bit) + { + grub_error (GRUB_ERR_BAD_OS, + "Mach-O doesn't contain suitable 64-bit architecture"); + goto fail; + } + + return macho; + +fail: + macho->file = 0; + grub_macho_close (macho); + return 0; +} + +grub_macho_t +grub_macho_open (const char *name, enum grub_file_type type, int is_64bit) +{ + grub_file_t file; + grub_macho_t macho; + + file = grub_file_open (name, type); + if (! file) + return 0; + + macho = grub_macho_file (file, name, is_64bit); + if (! macho) + grub_file_close (file); + + return macho; +} |