automake commit without merge history

grub-core/loader/macho.c

@@ -0,0 +1,161 @@
+/* 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/cpu/macho.h>
+#include <grub/machoload.h>
+#include <grub/file.h>
+#include <grub/gzio.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+
+grub_err_t
+grub_macho_close (grub_macho_t macho)
+{
+  grub_file_t file = macho->file;
+
+  grub_free (macho->cmds32);
+  grub_free (macho->cmds64);
+
+  grub_free (macho);
+
+  if (file)
+    grub_file_close (file);
+
+  return grub_errno;
+}
+
+grub_macho_t
+grub_macho_file (grub_file_t file)
+{
+  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;
+
+  if (grub_file_seek (macho->file, 0) == (grub_off_t) -1)
+    goto fail;
+
+  if (grub_file_read (macho->file, &filestart, sizeof (filestart))
+      != sizeof (filestart))
+    {
+      grub_error_push ();
+      grub_error (GRUB_ERR_READ_ERROR, "cannot read Mach-O header");
+      goto fail;
+    }
+
+  /* Is it a fat file? */
+  if (filestart.fat.magic == grub_be_to_cpu32 (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_malloc (sizeof (struct grub_macho_fat_arch) * narchs);
+      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);
+	  grub_error_push ();
+	  grub_error (GRUB_ERR_READ_ERROR, "cannot read Mach-O header");
+	  goto fail;
+	}
+
+      for (i = 0; i < narchs; i++)
+	{
+	  if (GRUB_MACHO_CPUTYPE_IS_HOST32
+	      (grub_be_to_cpu32 (archs[i].cputype)))
+	    {
+	      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 (GRUB_MACHO_CPUTYPE_IS_HOST64
+	      (grub_be_to_cpu32 (archs[i].cputype)))
+	    {
+	      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)
+    {
+      macho->offset32 = 0;
+      macho->end32 = grub_file_size (file);
+    }
+
+  /* Is it a thin 64-bit file? */
+  if (filestart.thin64.magic == GRUB_MACHO_MAGIC64)
+    {
+      macho->offset64 = 0;
+      macho->end64 = grub_file_size (file);
+    }
+
+  grub_macho_parse32 (macho);
+  grub_macho_parse64 (macho);
+
+  return macho;
+
+fail:
+  grub_macho_close (macho);
+  return 0;
+}
+
+grub_macho_t
+grub_macho_open (const char *name)
+{
+  grub_file_t file;
+  grub_macho_t macho;
+
+  file = grub_gzfile_open (name, 1);
+  if (! file)
+    return 0;
+
+  macho = grub_macho_file (file);
+  if (! macho)
+    grub_file_close (file);
+
+  return macho;
+}