161 lines
4 KiB
C
161 lines
4 KiB
C
/* macho.c - load Mach-O files. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* This Mach-O loader is incomplete and can load only non-relocatable segments.
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This is however enough to boot xnu (otool -l and Mach-O specs for more info).
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*/
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#include <grub/err.h>
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#include <grub/macho.h>
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#include <grub/cpu/macho.h>
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#include <grub/machoload.h>
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#include <grub/file.h>
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#include <grub/gzio.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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grub_err_t
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grub_macho_close (grub_macho_t macho)
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{
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grub_file_t file = macho->file;
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grub_free (macho->cmds32);
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grub_free (macho->cmds64);
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grub_free (macho);
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if (file)
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grub_file_close (file);
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return grub_errno;
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}
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grub_macho_t
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grub_macho_file (grub_file_t file)
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{
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grub_macho_t macho;
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union grub_macho_filestart filestart;
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macho = grub_malloc (sizeof (*macho));
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if (! macho)
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return 0;
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macho->file = file;
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macho->offset32 = -1;
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macho->offset64 = -1;
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macho->end32 = -1;
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macho->end64 = -1;
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macho->cmds32 = 0;
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macho->cmds64 = 0;
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if (grub_file_seek (macho->file, 0) == (grub_off_t) -1)
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goto fail;
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if (grub_file_read (macho->file, &filestart, sizeof (filestart))
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!= sizeof (filestart))
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{
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grub_error_push ();
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grub_error (GRUB_ERR_READ_ERROR, "cannot read Mach-O header");
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goto fail;
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}
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/* Is it a fat file? */
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if (filestart.fat.magic == grub_be_to_cpu32 (GRUB_MACHO_FAT_MAGIC))
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{
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struct grub_macho_fat_arch *archs;
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int i, narchs;
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/* Load architecture description. */
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narchs = grub_be_to_cpu32 (filestart.fat.nfat_arch);
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if (grub_file_seek (macho->file, sizeof (struct grub_macho_fat_header))
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== (grub_off_t) -1)
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goto fail;
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archs = grub_malloc (sizeof (struct grub_macho_fat_arch) * narchs);
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if (!archs)
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goto fail;
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if (grub_file_read (macho->file, archs,
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sizeof (struct grub_macho_fat_arch) * narchs)
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!= (grub_ssize_t)sizeof(struct grub_macho_fat_arch) * narchs)
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{
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grub_free (archs);
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grub_error_push ();
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grub_error (GRUB_ERR_READ_ERROR, "cannot read Mach-O header");
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goto fail;
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}
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for (i = 0; i < narchs; i++)
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{
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if (GRUB_MACHO_CPUTYPE_IS_HOST32
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(grub_be_to_cpu32 (archs[i].cputype)))
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{
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macho->offset32 = grub_be_to_cpu32 (archs[i].offset);
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macho->end32 = grub_be_to_cpu32 (archs[i].offset)
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+ grub_be_to_cpu32 (archs[i].size);
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}
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if (GRUB_MACHO_CPUTYPE_IS_HOST64
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(grub_be_to_cpu32 (archs[i].cputype)))
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{
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macho->offset64 = grub_be_to_cpu32 (archs[i].offset);
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macho->end64 = grub_be_to_cpu32 (archs[i].offset)
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+ grub_be_to_cpu32 (archs[i].size);
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}
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}
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grub_free (archs);
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}
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/* Is it a thin 32-bit file? */
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if (filestart.thin32.magic == GRUB_MACHO_MAGIC32)
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{
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macho->offset32 = 0;
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macho->end32 = grub_file_size (file);
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}
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/* Is it a thin 64-bit file? */
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if (filestart.thin64.magic == GRUB_MACHO_MAGIC64)
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{
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macho->offset64 = 0;
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macho->end64 = grub_file_size (file);
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}
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grub_macho_parse32 (macho);
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grub_macho_parse64 (macho);
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return macho;
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fail:
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grub_macho_close (macho);
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return 0;
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}
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grub_macho_t
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grub_macho_open (const char *name)
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{
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grub_file_t file;
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grub_macho_t macho;
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file = grub_gzfile_open (name, 1);
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if (! file)
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return 0;
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macho = grub_macho_file (file);
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if (! macho)
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grub_file_close (file);
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return macho;
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}
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