2001-02-06 H.J. Lu <hjl@gnu.org>

	* bfd/peicode.h (coff_swap_filehdr_in): Remove the e_magic
	checking.
	(pe_bfd_object_p): Rewrite with external_PEI_DOS_hdr and
	external_PEI_IMAGE_hdr.

1 files changed, 30 insertions, 44 deletions

diff --git a/bfd/peicode.h b/bfd/peicode.h
index 4a022f2ea5a..666e68c115d 100644
--- a/bfd/peicode.h
+++ b/bfd/peicode.h
@@ -208,26 +208,6 @@ coff_swap_filehdr_in (abfd, src, dst)
   filehdr_dst->f_flags = bfd_h_get_16(abfd, (bfd_byte *)filehdr_src-> f_flags);
   filehdr_dst->f_symptr = bfd_h_get_32 (abfd, (bfd_byte *) filehdr_src->f_symptr);
 
-#ifdef COFF_IMAGE_WITH_PE
-  /* There are really two magic numbers involved; the magic number
-     that says this is a NT executable (PEI) and the magic number that
-     determines the architecture.  The former is DOSMAGIC, stored in
-     the e_magic field.  The latter is stored in the f_magic field.
-     If the NT magic number isn't valid, the architecture magic number
-     could be mimicked by some other field (specifically, the number
-     of relocs in section 3).  Since this routine can only be called
-     correctly for a PEI file, check the e_magic number here, and, if
-     it doesn't match, clobber the f_magic number so that we don't get
-     a false match.  */
-#if 0
-  /* We can't assume that the PE header is at offset 0x80.  When it
-     isn't, the DOS header isn't read correctly, so we can't assume
-     e_magic is set even for valid PE files.  */
-  if (bfd_h_get_16 (abfd, (bfd_byte *) filehdr_src->e_magic) != DOSMAGIC)
-    filehdr_dst->f_magic = -1;
-#endif
-#endif
-
   /* Other people's tools sometimes generate headers with an nsyms but
      a zero symptr.  */
   if (filehdr_dst->f_nsyms != 0 && filehdr_dst->f_symptr == 0)
@@ -1255,16 +1235,10 @@ _("%s: Recognised but unhandled machine type (0x%x) in Import Library Format arc
 static const bfd_target *
 pe_bfd_object_p (bfd * abfd)
 {
-  /* We need to handle a PE image correctly.  In PE images created by
-     the GNU linker, the offset to the COFF header is always the size.
-     However, this is not the case in images generated by other PE
-     linkers.  The PE format stores a four byte offset to the PE
-     signature just before the COFF header at location 0x3c of the file.
-     We pick up that offset, verify that the PE signature is there, and
-     then set ourselves up to read in the COFF header.  */
   bfd_byte buffer[4];
+  struct external_PEI_DOS_hdr dos_hdr;
+  struct external_PEI_IMAGE_hdr image_hdr;
   file_ptr offset;
-  unsigned long signature;
 
   /* Detect if this a Microsoft Import Library Format element.  */
   if (bfd_seek (abfd, 0x00, SEEK_SET) != 0
@@ -1275,44 +1249,56 @@ pe_bfd_object_p (bfd * abfd)
       return NULL;
     }
 
-  signature = bfd_h_get_32 (abfd, buffer);
-
-  if (signature == 0xffff0000)
+  if (bfd_h_get_32 (abfd, buffer) == 0xffff0000)
     return pe_ILF_object_p (abfd);
 
-  if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0
-      || bfd_read (buffer, 1, 4, abfd) != 4)
+  if (bfd_seek (abfd, 0x00, SEEK_SET) != 0
+      || bfd_read (&dos_hdr, 1, sizeof (dos_hdr), abfd)
+	 != sizeof (dos_hdr))
     {
       if (bfd_get_error () != bfd_error_system_call)
 	bfd_set_error (bfd_error_wrong_format);
       return NULL;
     }
 
-  offset = bfd_h_get_32 (abfd, buffer);
+  /* There are really two magic numbers involved; the magic number
+     that says this is a NT executable (PEI) and the magic number that
+     determines the architecture.  The former is DOSMAGIC, stored in
+     the e_magic field.  The latter is stored in the f_magic field.
+     If the NT magic number isn't valid, the architecture magic number
+     could be mimicked by some other field (specifically, the number
+     of relocs in section 3).  Since this routine can only be called
+     correctly for a PEI file, check the e_magic number here, and, if
+     it doesn't match, clobber the f_magic number so that we don't get
+     a false match.  */
+  if (bfd_h_get_16 (abfd, (bfd_byte *) dos_hdr.e_magic) != DOSMAGIC)
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
 
-  if (bfd_seek (abfd, offset, SEEK_SET) != 0
-      || bfd_read (buffer, 1, 4, abfd) != 4)
+  offset = bfd_h_get_32 (abfd, (bfd_byte *) dos_hdr.e_lfanew);
+  if (bfd_seek (abfd, (file_ptr) offset, SEEK_SET) != 0
+      || bfd_read (&image_hdr, 1, sizeof (image_hdr), abfd)
+	 != sizeof (image_hdr))
     {
       if (bfd_get_error () != bfd_error_system_call)
 	bfd_set_error (bfd_error_wrong_format);
       return NULL;
     }
 
-  signature = bfd_h_get_32 (abfd, buffer);
-
-  if (signature != 0x4550)
+  if (bfd_h_get_32 (abfd, (bfd_byte *) image_hdr.nt_signature)
+      != 0x4550)
     {
       bfd_set_error (bfd_error_wrong_format);
       return NULL;
     }
 
   /* Here is the hack.  coff_object_p wants to read filhsz bytes to
-     pick up the COFF header.  We adjust so that that will work.  20
-     is the size of the i386 COFF filehdr.  */
+     pick up the COFF header for PE, see "struct external_PEI_filehdr"
+     in include/coff/pe.h.  We adjust so that that will work. */
   if (bfd_seek (abfd,
-		(bfd_tell (abfd)
-		 - bfd_coff_filhsz (abfd)
-		 + 20),
+		(file_ptr) (offset - sizeof (dos_hdr)),
 		SEEK_SET)
       != 0)
     {