[PATCH] FT32: support for FT32B processor - part 2/2

[James Bowman]

Nick Clifton writes:

> I am worried about this patch because currently it is not possible to test it.
> IE the framework to support the FT32B type has not yet gone in to the sources.
> Did I miss a patch that adds this ?  (Plus I assume that there is a patch to
> the top level config.sub file which needs to go into the gcc sources so that
> it can be imported into the binutils sources).

The FT32B code compression is enabled during relaxation time.  So there is
no top-level switch for the new CPU type - its code compression feature
is enabled by "ld --relax".

With these two patches, the tools can build FT32B binaries.

> One other thing - with a change like this, introducing major new functionality
> to a target, it would be a really good idea to include some testsuite tests.  
> You definitely want to make sure that the assembler can create these new format
> objects and the disassembler can reconstruct them correctly.

Good idea. I have added a new gas test, ft32/insnsc which exercises all the
compressed short codes.

I have corrected the code issues from your review.

OK to commit?

bfd/ChangeLog:

2017-10-31  James Bowman  <james.bowman@ftdichip.com>

	* archures.c: Add bfd_mach_ft32b.
	* cpu-ft32.c: Add arch_info_struct.
	* elf32-ft32.c: Add R_FT32_RELAX, SC0, SC1,
	DIFF32. (ft32_elf_relocate_section): Add clauses
	for R_FT32_SC0, SC1, DIFF32.  (ft32_reloc_shortable,
	elf32_ft32_is_diff_reloc, elf32_ft32_adjust_diff_reloc_value,
	elf32_ft32_adjust_reloc_if_spans_insn,
	elf32_ft32_relax_delete_bytes, elf32_ft32_relax_is_branch_target,
	ft32_elf_relax_section): New function.
	* reloc.c: Add BFD_RELOC_FT32_RELAX, SC0, SC1, DIFF32.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.

gas/ChangeLog:

2017-10-31  James Bowman  <james.bowman@ftdichip.com>

	* config/tc-ft32.c (md_assemble): add relaxation reloc
	BFD_RELOC_FT32_RELAX.  (md_longopts): Add "norelax" and
	"no-relax". (md_apply_fix): Add reloc BFD_RELOC_FT32_DIFF32.
	(relaxable_section, ft32_validate_fix_sub, ft32_force_relocation,
	ft32_allow_local_subtract): New function.
	* config/tc-ft32.h: remove unused MD_PCREL_FROM_SECTION.
	* testsuite/gas/ft32/insnsc.s: New test exercising all FT32B
	shortcodes.

include/ChangeLog:

2017-10-31  James Bowman  <james.bowman@ftdichip.com>

	* elf/ft32.h: Add R_FT32_RELAX, SC0, SC1, DIFF32.
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