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|
/* 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;
}
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