gas patch for non-octet processors

[jnielsen]

The attached patches correct an issue that exists in gas. The problem is 
general but only manifests itself when OCTETS_PER_BYTE > 1. I have found 
the problem in binutils 2.22 in connection with TI C4x (i.e. ./configure 
--target=c4x-coff).

Function frag_offset_fixed_p in frags.[ch] returns an offset through its 
last parameter. The parameter type is bfd_vma which is unsigned. The only 
calls to the function are in expr.c; the offset is returned to local 
variables frag_off which are also of type bfd_vma. The variables frag_off 
are divided by OCTETS_PER_BYTE; the problem is that these divisions are 
unsigned as a result of the use of bfd_vma. Dividing these offsets must be 
done signed. No actual division takes place when OCTETS_PER_BYTE = 1 so 
this problem only manifests itself when OCTETS_PER_BYTE > 1.

These uses of bfd_vma are the only ones in the three sources expr.c, 
frags.c, frags.h. I believe all these uses of bfd_vma should be changed to 
offsetT. This will be more consistent with the definitions of the struct 
members used in frag_offset_fixed_p and the fact that the returned value 
is supposed to be an offset; it also makes the divisions produce the 
correct values when OCTETS_PER_BYTE > 1.

Please consider these patches for future binutils releases. The revisions 
of the original expr.c, frags.c, and frags.h are respectively 1.90, 
1.30.2.1, and 1.24.4.1.

Thanks,
Johan Olmutz Nielsen

--- expr.1.90.c 2011-03-17 11:59:29.000000000 +0100
+++ expr.c      2012-06-22 12:33:40.531010600 +0200
@@ -1746,7 +1746,7 @@
   while (op_left != O_illegal && op_rank[(int) op_left] > rank)
     {
       segT rightseg;
-      bfd_vma frag_off;
+      offsetT frag_off;
 
       input_line_pointer += op_chars;  /* -> after operator.  */
 
@@ -2030,7 +2030,7 @@
   valueT left, right;
   segT seg_left, seg_right;
   fragS *frag_left, *frag_right;
-  bfd_vma frag_off;
+  offsetT frag_off;
 
   switch (op)
     {

--- frags.1.30.2.1.c    2011-11-21 10:29:28.000000000 +0100
+++ frags.c     2012-06-22 12:23:46.886766700 +0200
@@ -394,10 +394,10 @@
    not already accounted for in the frag FR_ADDRESS.  */
 
 bfd_boolean
-frag_offset_fixed_p (const fragS *frag1, const fragS *frag2, bfd_vma 
*offset)
+frag_offset_fixed_p (const fragS *frag1, const fragS *frag2, offsetT 
*offset)
 {
   const fragS *frag;
-  bfd_vma off;
+  offsetT off;
 
   /* Start with offset initialised to difference between the two frags.
      Prior to assigning frag addresses this will be zero.  */

--- frags.1.24.4.1.h    2011-11-21 10:29:28.000000000 +0100
+++ frags.h     2012-06-22 12:23:02.655089200 +0200
@@ -151,6 +151,6 @@
                offsetT offset,
                char *opcode);
 
-bfd_boolean frag_offset_fixed_p (const fragS *, const fragS *, bfd_vma 
*);
+bfd_boolean frag_offset_fixed_p (const fragS *, const fragS *, offsetT 
*);
 
 #endif /* FRAGS_H */