S12Z: New 32 bit Reloc.

Third party tools produce 32 bit relocs  at index 6 with strange properties.
This change moves the existing 32 bit reloc (R_S12Z_EXT32) to index 7
and introduces a new one (R_S12Z_CW32) at index 6 to try to support code
generated by these tools.

  * bfd/elf32-s12z.c (elf_s12z_howto_table) [R_S12Z_CW32]: New member.
  * binutils/readelf.c (is_32bit_abs_reloc): Reloc type 7 is also 32 bit.
  * include/elf/s12z.h (elf_s12z_reloc_tpe) [RELOC_NUMBER (R_S12Z_CW32)]: New enum.

bfd/elf32-s12z.c

@@ -183,6 +183,29 @@ static reloc_howto_type elf_s12z_howto_table[] =
 	 0x0005ffff,		/* dst_mask */
 	 FALSE),		/* pcrel_offset */
 
+  /* A 32 bit absolute relocation.   This kind of relocation is
+     schizophrenic - Although they appear in sections named .rela.debug.*
+     in some sections they behave as RELA relocs, but in others they have
+     an added of zero and behave as REL.
+
+     It is not recommended that new code  emits this reloc.   It is here
+     only to support existing elf files generated by third party
+     applications.  */
+
+  HOWTO (R_S12Z_CW32,        /* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,	/* special_function */
+	 "R_S12Z_CW32",	/* name */
+	 FALSE,			/* partial_inplace */
+	 0xffffffff,            /* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
+
   /* A 32 bit absolute relocation  */
   HOWTO (R_S12Z_EXT32,        /* type */
 	 0,			/* rightshift */

binutils/readelf.c

@@ -12386,7 +12386,8 @@ is_32bit_abs_reloc (Filedata * filedata, unsigned int reloc_type)
     case EM_68HC12:
       return reloc_type == 6; /* R_M68HC11_32.  */
     case EM_S12Z:
-      return reloc_type == 6; /* R_S12Z_EXT32.  */
+      return reloc_type == 7 || /* R_S12Z_EXT32 */
+	reloc_type == 6;        /* R_S12Z_CW32.  */
     case EM_MCORE:
       return reloc_type == 1; /* R_MCORE_ADDR32.  */
     case EM_CYGNUS_MEP:

include/elf/s12z.h

@@ -30,7 +30,8 @@ START_RELOC_NUMBERS (elf_s12z_reloc_type)
   RELOC_NUMBER (R_S12Z_PCREL_7_15, 3)
   RELOC_NUMBER (R_S12Z_EXT24, 4)
   RELOC_NUMBER (R_S12Z_EXT18, 5)
-  RELOC_NUMBER (R_S12Z_EXT32, 6)
+  RELOC_NUMBER (R_S12Z_CW32, 6)
+  RELOC_NUMBER (R_S12Z_EXT32, 7)
 END_RELOC_NUMBERS (R_S12Z_max)
 
 #endif