From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Peter Jones <pjones@redhat.com>

Date: Fri, 19 Feb 2021 14:22:13 +0100

Subject: [PATCH] util/mkimage: Unify more of the PE32 and PE32+ header set-up

There's quite a bit of code duplication in the code that sets the optional

header for PE32 and PE32+. The two are very similar with the exception of

a few fields that have type grub_uint64_t instead of grub_uint32_t.

Factor out the common code and add a PE_OHDR() macro that simplifies the

set-up and make the code more readable.

Signed-off-by: Peter Jones <pjones@redhat.com>

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

---

 util/mkimage.c | 111 ++++++++++++++++++++++++++-------------------------------

 1 file changed, 51 insertions(+), 60 deletions(-)

diff --git a/util/mkimage.c b/util/mkimage.c

index d2876cdb5..ff5462c98 100644

--- a/util/mkimage.c

+++ b/util/mkimage.c

@@ -771,6 +771,21 @@ grub_install_get_image_targets_string (void)

   return formats;

 }

+/*

+ * tmp_ is just here so the compiler knows we'll never derefernce a NULL.

+ * It should get fully optimized away.

+ */

+#define PE_OHDR(o32, o64, field) (*(		\

+{						\

+  __typeof__((o64)->field) tmp_;		\

+  __typeof__((o64)->field) *ret_ = &tmp_;	\

+  if (o32)					\

+    ret_ = (void *)(&((o32)->field));		\

+  else if (o64)				\

+    ret_ = (void *)(&((o64)->field));		\

+  ret_;					\

+}))

+

 void

 grub_install_generate_image (const char *dir, const char *prefix,

 			     FILE *out, const char *outname, char *mods[],

@@ -1240,6 +1255,8 @@ grub_install_generate_image (const char *dir, const char *prefix,

 	static const grub_uint8_t stub[] = GRUB_PE32_MSDOS_STUB;

 	int header_size;

 	int reloc_addr;

+	struct grub_pe32_optional_header *o32 = NULL;

+	struct grub_pe64_optional_header *o64 = NULL;

 	if (image_target->voidp_sizeof == 4)

 	  header_size = EFI32_HEADER_SIZE;

@@ -1281,76 +1298,50 @@ grub_install_generate_image (const char *dir, const char *prefix,

 	/* The PE Optional header.  */

 	if (image_target->voidp_sizeof == 4)

 	  {

-	    struct grub_pe32_optional_header *o;

-

 	    c->optional_header_size = grub_host_to_target16 (sizeof (struct grub_pe32_optional_header));

-	    o = (struct grub_pe32_optional_header *)

-	      (header + GRUB_PE32_MSDOS_STUB_SIZE + GRUB_PE32_SIGNATURE_SIZE

-	       + sizeof (struct grub_pe32_coff_header));

-	    o->magic = grub_host_to_target16 (GRUB_PE32_PE32_MAGIC);

-	    o->code_size = grub_host_to_target32 (layout.exec_size);

-	    o->data_size = grub_host_to_target32 (reloc_addr - layout.exec_size

-					     - header_size);

-	    o->entry_addr = grub_host_to_target32 (layout.start_address);

-	    o->code_base = grub_host_to_target32 (header_size);

+	    o32 = (struct grub_pe32_optional_header *)

+	      (header + GRUB_PE32_MSDOS_STUB_SIZE + GRUB_PE32_SIGNATURE_SIZE +

+	       sizeof (struct grub_pe32_coff_header));

+	    o32->magic = grub_host_to_target16 (GRUB_PE32_PE32_MAGIC);

+	    o32->data_base = grub_host_to_target32 (header_size + layout.exec_size);

-	    o->data_base = grub_host_to_target32 (header_size + layout.exec_size);

-

-	    o->image_base = 0;

-	    o->section_alignment = grub_host_to_target32 (image_target->section_align);

-	    o->file_alignment = grub_host_to_target32 (image_target->section_align);

-	    o->image_size = grub_host_to_target32 (pe_size);

-	    o->header_size = grub_host_to_target32 (header_size);

-	    o->subsystem = grub_host_to_target16 (GRUB_PE32_SUBSYSTEM_EFI_APPLICATION);

-

-	    /* Do these really matter? */

-	    o->stack_reserve_size = grub_host_to_target32 (0x10000);

-	    o->stack_commit_size = grub_host_to_target32 (0x10000);

-	    o->heap_reserve_size = grub_host_to_target32 (0x10000);

-	    o->heap_commit_size = grub_host_to_target32 (0x10000);

-    

-	    o->num_data_directories = grub_host_to_target32 (GRUB_PE32_NUM_DATA_DIRECTORIES);

-

-	    o->base_relocation_table.rva = grub_host_to_target32 (reloc_addr);

-	    o->base_relocation_table.size = grub_host_to_target32 (layout.reloc_size);

-	    sections = o + 1;

+	    sections = o32 + 1;

 	  }

 	else

 	  {

-	    struct grub_pe64_optional_header *o;

-

 	    c->optional_header_size = grub_host_to_target16 (sizeof (struct grub_pe64_optional_header));

-	    o = (struct grub_pe64_optional_header *) 

-	      (header + GRUB_PE32_MSDOS_STUB_SIZE + GRUB_PE32_SIGNATURE_SIZE

-	       + sizeof (struct grub_pe32_coff_header));

-	    o->magic = grub_host_to_target16 (GRUB_PE32_PE64_MAGIC);

-	    o->code_size = grub_host_to_target32 (layout.exec_size);

-	    o->data_size = grub_host_to_target32 (reloc_addr - layout.exec_size

-					     - header_size);

-	    o->entry_addr = grub_host_to_target32 (layout.start_address);

-	    o->code_base = grub_host_to_target32 (header_size);

-	    o->image_base = 0;

-	    o->section_alignment = grub_host_to_target32 (image_target->section_align);

-	    o->file_alignment = grub_host_to_target32 (image_target->section_align);

-	    o->image_size = grub_host_to_target32 (pe_size);

-	    o->header_size = grub_host_to_target32 (header_size);

-	    o->subsystem = grub_host_to_target16 (GRUB_PE32_SUBSYSTEM_EFI_APPLICATION);

+	    o64 = (struct grub_pe64_optional_header *)

+	      (header + GRUB_PE32_MSDOS_STUB_SIZE + GRUB_PE32_SIGNATURE_SIZE +

+	       sizeof (struct grub_pe32_coff_header));

+	    o64->magic = grub_host_to_target16 (GRUB_PE32_PE64_MAGIC);

-	    /* Do these really matter? */

-	    o->stack_reserve_size = grub_host_to_target32 (0x10000);

-	    o->stack_commit_size = grub_host_to_target32 (0x10000);

-	    o->heap_reserve_size = grub_host_to_target32 (0x10000);

-	    o->heap_commit_size = grub_host_to_target32 (0x10000);

-    

-	    o->num_data_directories

-	      = grub_host_to_target32 (GRUB_PE32_NUM_DATA_DIRECTORIES);

-

-	    o->base_relocation_table.rva = grub_host_to_target32 (reloc_addr);

-	    o->base_relocation_table.size = grub_host_to_target32 (layout.reloc_size);

-	    sections = o + 1;

+	    sections = o64 + 1;

 	  }

+

+	PE_OHDR (o32, o64, code_size) = grub_host_to_target32 (layout.exec_size);

+	PE_OHDR (o32, o64, data_size) = grub_host_to_target32 (reloc_addr - layout.exec_size - header_size);

+	PE_OHDR (o32, o64, entry_addr) = grub_host_to_target32 (layout.start_address);

+	PE_OHDR (o32, o64, code_base) = grub_host_to_target32 (header_size);

+

+	PE_OHDR (o32, o64, image_base) = 0;

+	PE_OHDR (o32, o64, section_alignment) = grub_host_to_target32 (image_target->section_align);

+	PE_OHDR (o32, o64, file_alignment) = grub_host_to_target32 (GRUB_PE32_FILE_ALIGNMENT);

+	PE_OHDR (o32, o64, image_size) = grub_host_to_target32 (pe_size);

+	PE_OHDR (o32, o64, header_size) = grub_host_to_target32 (header_size);

+	PE_OHDR (o32, o64, subsystem) = grub_host_to_target16 (GRUB_PE32_SUBSYSTEM_EFI_APPLICATION);

+

+	/* Do these really matter? */

+	PE_OHDR (o32, o64, stack_reserve_size) = grub_host_to_target32 (0x10000);

+	PE_OHDR (o32, o64, stack_commit_size) = grub_host_to_target32 (0x10000);

+	PE_OHDR (o32, o64, heap_reserve_size) = grub_host_to_target32 (0x10000);

+	PE_OHDR (o32, o64, heap_commit_size) = grub_host_to_target32 (0x10000);

+

+	PE_OHDR (o32, o64, num_data_directories) = grub_host_to_target32 (GRUB_PE32_NUM_DATA_DIRECTORIES);

+	PE_OHDR (o32, o64, base_relocation_table.rva) = grub_host_to_target32 (reloc_addr);

+	PE_OHDR (o32, o64, base_relocation_table.size) = grub_host_to_target32 (layout.reloc_size);

+

 	/* The sections.  */

 	text_section = sections;

 	strcpy (text_section->name, ".text");