[PATCH]: HC11 linker relax fixes (potential pb on other relax targets)

[Stephane Carrez]

Hi!

I committed this patch to fix problems in HC11 linker relaxations.
The first 3 points are HC11 specific but the last point is present in
other relaxing targets (I think):

   - we must use a PCREL reloc when long branch is converted to a short branch
     and we must not compute the branch offset now (the reloc will ensure correct offset)

   - a jsr can be changed to bsr if the address is in page0 (0..0x0ff)

   - a far symbol must not be relaxed because we will need to use its trampoline
     address (and we don't know where it is at this stage).

   - when we adjust the symbols after removing bytes, we must take into
     account the symbol that marks the end of the section.  The test that exists
     in the bfd relax targets (and that I copied!) is:

        if (isym->st_shndx == sec_shndx
  	  && isym->st_value > addr
	  && isym->st_value < toaddr)

     and it is not correct if there is a section that defines a label at its very end.
     It will not be adjusted. In general such symbol is defined to compute the
     size of some code and it will thus report the size before relax instead of the
     final size.

   Stephane

2003-04-04  Stephane Carrez  <stcarrez@nerim.fr>

	* elf32-m68hc11.c (m68hc11_elf_relax_delete_bytes): Also adjust
	symbols that mark the end of the section.
	(m68hc11_elf_relax_section): Use R_M68HC11_PCREL_8 relocs when
	converting to a relative branch so that the offset is computed after
	the relaxation; also relocate a jsr into a bsr if possible but don't
	relax them if they are to a far symbol as we need to call the
	trampoline code.
	(elf_m68hc11_howto_table): Set pcrel_offset to true.

2003-04-04  Stephane Carrez  <stcarrez@nerim.fr>

	* ld-m68hc11/bug-1417.d: Update to take into account jsr->bsr relax.
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