Add pe/x86_64 bigobj file format.

bfd/
	* peicode.h (pe_ILF_object_p): Adjust, as the version number
	has been read.
	(pe_bfd_object_p): Also read version number to detect ILF.
	* pe-x86_64.c (COFF_WITH_PE_BIGOBJ): Define.
	(x86_64pe_bigobj_vec): Define
	* coffcode.h (bfd_coff_backend_data): Add _bfd_coff_max_nscns field.
	(bfd_coff_max_nscns): New macro.
	(coff_compute_section_file_positions): Use unsigned int for
	target_index.  Compare with bfd_coff_max_nscns.
	(bfd_coff_std_swap_table, ticoff0_swap_table, ticoff1_swap_table):
	Set a value for _bfd_coff_max_nscns.
	(header_bigobj_classid): New constant.
	(coff_bigobj_swap_filehdr_in, coff_bigobj_swap_filehdr_out)
	(coff_bigobj_swap_sym_in, coff_bigobj_swap_sym_out)
	(coff_bigobj_swap_aux_in, coff_bigobj_swap_aux_out): New
	functions.
	(bigobj_swap_table): New table.
	* libcoff.h: Regenerate.
	* coff-sh.c (bfd_coff_small_swap_table): Likewise.
	* coff-alpha.c (alpha_ecoff_backend_data): Add value for
	_bfd_coff_max_nscns.
	* coff-mips.c (mips_ecoff_backend_data): Likewise.
	* coff-rs6000.c (bfd_xcoff_backend_data)
	(bfd_pmac_xcoff_backend_data): Likewise.
	* coff64-rs6000.c (bfd_xcoff_backend_data)
	(bfd_xcoff_aix5_backend_data): Likewise.
	* targets.c (x86_64pe_bigobj_vec): Declare.
	* configure.in (x86_64pe_bigobj_vec): New vector.
	* configure: Regenerate.
	* config.bfd: Add bigobj object format for Windows targets.

gas/
	* config/tc-i386.c (use_big_obj): Declare.
	(OPTION_MBIG_OBJ): Define.
	(md_longopts): Add -mbig-obj option.
	(md_parse_option): Handle it.
	(md_show_usage): Display help for this option.
	(i386_target_format): Use bigobj for x86-64 if -mbig-obj.
	* doc/c-i386.texi: Document the option.

gas/testsuite/
	* gas/pe/big-obj.d, gas/pe/big-obj.s: Add test.
	* gas/pe/pe.exp: Add test.

include/coff/
	* pe.h (struct external_ANON_OBJECT_HEADER_BIGOBJ): Declare.
	(FILHSZ_BIGOBJ): Define.
	(struct external_SYMBOL_EX): Declare.
	(SYMENT_BIGOBJ, SYMESZ_BIGOBJ): Define.
	(union external_AUX_SYMBOL_EX): Declare.
	(AUXENT_BIGOBJ, AUXESZ_BIGOBJ): Define.
	* internal.h (struct internal_filehdr): Change type
	of f_nscns.

1 files changed, 9 insertions, 10 deletions

diff --git a/bfd/peicode.h b/bfd/peicode.h
index 8fd689c..157879b 100644
--- a/bfd/peicode.h
+++ b/bfd/peicode.h
@@ -1077,7 +1077,7 @@ pe_ILF_build_a_bfd (bfd *           abfd,
 static const bfd_target *
 pe_ILF_object_p (bfd * abfd)
 {
-  bfd_byte        buffer[16];
+  bfd_byte        buffer[14];
   bfd_byte *      ptr;
   char *          symbol_name;
   char *          source_dll;
@@ -1087,17 +1087,13 @@ pe_ILF_object_p (bfd * abfd)
   unsigned int    types;
   unsigned int    magic;
 
-  /* Upon entry the first four buyes of the ILF header have
+  /* Upon entry the first six bytes of the ILF header have
       already been read.  Now read the rest of the header.  */
-  if (bfd_bread (buffer, (bfd_size_type) 16, abfd) != 16)
+  if (bfd_bread (buffer, (bfd_size_type) 14, abfd) != 14)
     return NULL;
 
   ptr = buffer;
 
-  /*  We do not bother to check the version number.
-      version = H_GET_16 (abfd, ptr);  */
-  ptr += 2;
-
   machine = H_GET_16 (abfd, ptr);
   ptr += 2;
 
@@ -1251,7 +1247,7 @@ pe_ILF_object_p (bfd * abfd)
 static const bfd_target *
 pe_bfd_object_p (bfd * abfd)
 {
-  bfd_byte buffer[4];
+  bfd_byte buffer[6];
   struct external_PEI_DOS_hdr dos_hdr;
   struct external_PEI_IMAGE_hdr image_hdr;
   struct internal_filehdr internal_f;
@@ -1260,15 +1256,18 @@ pe_bfd_object_p (bfd * abfd)
   file_ptr offset;
 
   /* Detect if this a Microsoft Import Library Format element.  */
+  /* First read the beginning of the header.  */
   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
-      || bfd_bread (buffer, (bfd_size_type) 4, abfd) != 4)
+      || bfd_bread (buffer, (bfd_size_type) 6, abfd) != 6)
     {
       if (bfd_get_error () != bfd_error_system_call)
 	bfd_set_error (bfd_error_wrong_format);
       return NULL;
     }
 
-  if (H_GET_32 (abfd, buffer) == 0xffff0000)
+  /* Then check the magic and the version (only 0 is supported).  */
+  if (H_GET_32 (abfd, buffer) == 0xffff0000
+      && H_GET_16 (abfd, buffer + 4) == 0)
     return pe_ILF_object_p (abfd);
 
   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0