* readelf.c (get_machine_flags): Add detection of EF_MIPS_32BITMODE.

[binutils-gdb.git] / bfd / coff-ia64.c

diff --git a/bfd/coff-ia64.c b/bfd/coff-ia64.c
index 5b10e3b88df1c13b8d5b40c4eb0b0a15c597e192..8452d961870211e21b0f61d19ec390f1cc883c75 100644 (file)
--- a/bfd/coff-ia64.c
+++ b/bfd/coff-ia64.c
@@ -52,6 +52,8 @@ static reloc_howto_type howto_table[] =
 /* Return true if this relocation should
    appear in the output .reloc section.  */
 
+static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
+
 static boolean
 in_reloc_p(abfd, howto)
      bfd * abfd ATTRIBUTE_UNUSED;
@@ -63,56 +65,65 @@ in_reloc_p(abfd, howto)
 
 #include "coffcode.h"
 
+static const bfd_target *ia64coff_object_p PARAMS ((bfd *));
+
 static const bfd_target *
 ia64coff_object_p (abfd)
      bfd *abfd;
 {
 #ifdef COFF_IMAGE_WITH_PE
-  /* We need to hack badly 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 ext_offset[4];
+    struct external_PEI_DOS_hdr dos_hdr;
+    struct external_PEI_IMAGE_hdr image_hdr;
     file_ptr offset;
-    bfd_byte ext_signature[4];
-    unsigned long signature;
 
-    if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0
-       || bfd_read (ext_offset, 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, ext_offset);
-    if (bfd_seek (abfd, offset, SEEK_SET) != 0
-       || bfd_read (ext_signature, 1, 4, abfd) != 4)
+
+    /* 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;
+      }
+
+    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, ext_signature);
 
-    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 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)
       {