grub2/0093-Support-Apple-FAT-binaries-on-non-Apple-platforms.patch

From 9b1eeacef1a590c4bb1cd99f24b7038e77c3de33 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Thu, 10 Jan 2013 12:50:01 +0100
Subject: [PATCH 093/482] 	Support Apple FAT binaries on non-Apple
 platforms.

	* include/grub/macho.h (GRUB_MACHO_FAT_EFI_MAGIC): New define.
	* include/grub/i386/macho.h (GRUB_MACHO_CPUTYPE_IS_HOST_CURRENT):
	Likewise.
	* grub-core/loader/efi/chainloader.c (grub_cmd_chainloader): Parse
	Apple FAT binaries.
---
 ChangeLog                          | 10 ++++++++
 grub-core/loader/efi/chainloader.c | 48 +++++++++++++++++++++++++++++++++++---
 include/grub/i386/macho.h          |  5 ++++
 include/grub/macho.h               |  1 +
 4 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 48d297d..4567cae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2013-01-10  Vladimir Serbinenko  <phcoder@gmail.com>
 
+	Support Apple FAT binaries on non-Apple platforms.
+
+	* include/grub/macho.h (GRUB_MACHO_FAT_EFI_MAGIC): New define.
+	* include/grub/i386/macho.h (GRUB_MACHO_CPUTYPE_IS_HOST_CURRENT):
+	Likewise.
+	* grub-core/loader/efi/chainloader.c (grub_cmd_chainloader): Parse
+	Apple FAT binaries.
+
+2013-01-10  Vladimir Serbinenko  <phcoder@gmail.com>
+
 	* grub-core/kern/disk.c (grub_disk_write): Fix sector number on 4K
 	sector devices.
 
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index 3f3e6e3..c0fed80 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -35,6 +35,10 @@
 #include <grub/command.h>
 #include <grub/i18n.h>
 #include <grub/net.h>
+#if defined (__i386__) || defined (__x86_64__)
+#include <grub/macho.h>
+#include <grub/i386/macho.h>
+#endif
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -198,6 +202,7 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
   grub_efi_device_path_t *dp = 0;
   grub_efi_loaded_image_t *loaded_image;
   char *filename;
+  void *boot_image = 0;
   grub_efi_handle_t dev_handle = 0;
 
   if (argc == 0)
@@ -278,7 +283,8 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
-  if (grub_file_read (file, (void *) ((grub_addr_t) address), size) != size)
+  boot_image = (void *) ((grub_addr_t) address);
+  if (grub_file_read (file, boot_image, size) != size)
     {
       if (grub_errno == GRUB_ERR_NONE)
 	grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
@@ -287,9 +293,45 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
+#if defined (__i386__) || defined (__x86_64__)
+  if (size >= (grub_ssize_t) sizeof (struct grub_macho_fat_header))
+    {
+      struct grub_macho_fat_header *head = boot_image;
+      if (head->magic
+	  == grub_cpu_to_le32_compile_time (GRUB_MACHO_FAT_EFI_MAGIC))
+	{
+	  grub_uint32_t i;
+	  struct grub_macho_fat_arch *archs
+	    = (struct grub_macho_fat_arch *) (head + 1);
+	  for (i = 0; i < grub_cpu_to_le32 (head->nfat_arch); i++)
+	    {
+	      if (GRUB_MACHO_CPUTYPE_IS_HOST_CURRENT (archs[i].cputype))
+		break;
+	    }
+	  if (i == grub_cpu_to_le32 (head->nfat_arch))
+	    {
+	      grub_error (GRUB_ERR_BAD_OS, "no compatible arch found");
+	      goto fail;
+	    }
+	  if (grub_cpu_to_le32 (archs[i].offset)
+	      > ~grub_cpu_to_le32 (archs[i].size)
+	      || grub_cpu_to_le32 (archs[i].offset)
+	      + grub_cpu_to_le32 (archs[i].size)
+	      > (grub_size_t) size)
+	    {
+	      grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
+			  filename);
+	      goto fail;
+	    }
+	  boot_image = (char *) boot_image + grub_cpu_to_le32 (archs[i].offset);
+	  size = grub_cpu_to_le32 (archs[i].size);
+	}
+    }
+#endif
+
   status = efi_call_6 (b->load_image, 0, grub_efi_image_handle, file_path,
-			  (void *) ((grub_addr_t) address), size,
-			  &image_handle);
+		       boot_image, size,
+		       &image_handle);
   if (status != GRUB_EFI_SUCCESS)
     {
       if (status == GRUB_EFI_OUT_OF_RESOURCES)
diff --git a/include/grub/i386/macho.h b/include/grub/i386/macho.h
index f22c211..5ee9f9e 100644
--- a/include/grub/i386/macho.h
+++ b/include/grub/i386/macho.h
@@ -23,6 +23,11 @@
 
 #define GRUB_MACHO_CPUTYPE_IS_HOST32(x) ((x)==0x00000007)
 #define GRUB_MACHO_CPUTYPE_IS_HOST64(x) ((x)==0x01000007)
+#ifdef __x86_64__
+#define GRUB_MACHO_CPUTYPE_IS_HOST_CURRENT(x) ((x)==0x01000007)
+#else
+#define GRUB_MACHO_CPUTYPE_IS_HOST_CURRENT(x) ((x)==0x00000007)
+#endif
 
 struct grub_macho_thread32
 {
diff --git a/include/grub/macho.h b/include/grub/macho.h
index 6a98b6e..21f0714 100644
--- a/include/grub/macho.h
+++ b/include/grub/macho.h
@@ -27,6 +27,7 @@ struct grub_macho_fat_header
   grub_uint32_t nfat_arch;
 } __attribute__ ((packed));
 #define GRUB_MACHO_FAT_MAGIC 0xcafebabe
+#define GRUB_MACHO_FAT_EFI_MAGIC 0x0ef1fab9
 
 typedef grub_uint32_t grub_macho_cpu_type_t;
 typedef grub_uint32_t grub_macho_cpu_subtype_t;
-- 
1.8.2.1