readelf display of 0x800...000 addend

[Alan Modra]

Nick, in commit 834f871cdc, you changed readelf to display
sym + 8000...0000 for rela relocs with a MIN_INT addend.
Previously we showed sym - 8000...0000, which I think is a little more
correct if readelf is showing signed addends.  Was the change just to
avoid a ubsan warning about negation of MIN_INT?  If so, we can avoid
the warning by simply doing unsigned arithmetic.

	* readelf.c (dump_relocations): Show MIN_INT addends as negative.

OK?

diff --git a/binutils/readelf.c b/binutils/readelf.c
index c313db4..a9b9f2d 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -1608,12 +1608,9 @@ dump_relocations (FILE * file,
 
 	      if (is_rela)
 		{
-		  bfd_signed_vma off = rels[i].r_addend;
+		  bfd_vma off = rels[i].r_addend;
 
-		  /* PR 17531: file: 2e63226f.  */
-		  if (off == ((bfd_signed_vma) 1) << ((sizeof (bfd_signed_vma) * 8) - 1))
-		    printf (" + %" BFD_VMA_FMT "x", off);
-		  else if (off < 0)
+		  if ((bfd_signed_vma) off < 0)
 		    printf (" - %" BFD_VMA_FMT "x", - off);
 		  else
 		    printf (" + %" BFD_VMA_FMT "x", off);
@@ -1622,13 +1619,10 @@ dump_relocations (FILE * file,
 	}
       else if (is_rela)
 	{
-	  bfd_signed_vma off = rels[i].r_addend;
+	  bfd_vma off = rels[i].r_addend;
 
 	  printf ("%*c", is_32bit_elf ? 12 : 20, ' ');
-	  /* PR 17531: file: 2e63226f.  */
-	  if (off == ((bfd_signed_vma) 1) << ((sizeof (bfd_signed_vma) * 8) - 1))
-	    printf ("%" BFD_VMA_FMT "x", off);
-	  else if (off < 0)
+	  if ((bfd_signed_vma) off < 0)
 	    printf ("-%" BFD_VMA_FMT "x", - off);
 	  else
 	    printf ("%" BFD_VMA_FMT "x", off);

-- 
Alan Modra
Australia Development Lab, IBM