Commit: MSP430: Add support for silicon errata

[Nick Clifton]

Hi Guys,

  I am checking in the patch below to add support for fixing various
  MSP430 CPU silicon errata in the assembler.  Two new options are
  implemented:

      -msilicon-errata=<name>[,<name>...]
    
    Implements a fixup for named silicon errata.  Multiple silicon
    errata can be specified by multiple uses of the -msilicon-errata
    option and/or by including the errata names, separated by commas,
    on an individual -msilicon-errata option.  The option acts silently
    except when handling errata cpu42.  Errata names currently
    recognised by the assembler are:

    cpu4
      PUSH #4 and PUSH #8 need longer encodings on the MSP430.
      This option is enabled by default, and cannot be disabled.
    cpu8
      Do not set the stack pointer to an odd value.
    cpu11
      Do not update the status register and the PC in the same
      instruction.
    cpu12
      Do not use the PC in a CMP or BIT instruction.
    cpu13
      Do not use an arithmetic instruction to modify the status
      register.
    cpu19
      Insert NOP after CPUOFF.
    cpu42
      Warn where a NOP ought to be present after enabling interrupts.
    cpu42+
      Add NOP after enabling interrupts.


      -msilicon-errata-warn=<name>[,<name>...]
    
    Like the -msilicon-errata option except that instead of fixing the
    specified errata, a warning message is issued instead.  This option
    can be used alongside -msilicon-errata to generate messages whenever
    a problem is fixed, or on its own in order to inspect code for
    potential problems.

Cheers
  Nick

gas/ChangeLog
2015-10-22  Nick Clifton  <nickc@redhat.com>

	* config/tc-msp430.c (PUSH_1X_WORKAROUND): Delete.
	(OPTION_SILICON_ERRATA): Define.
	(OPTION_SILICON_WARN): Define.
	(md_parse_opton): Handle silicon errata options.
	(md_longopts): Add silicon errata options.
	(ms_show_usage): Report silicon errata options.
	(msp430_srcoperand): Handle silicon errata.
	(msp430_operands): Likewise. Improve nop insertion.
	(msp430_fix_adjustable): Update warning generation.
	* doc/c-msp430.texi: Document silicon errata options.

gas/testsuite/ChangeLog
2015-10-22  Nick Clifton  <nickc@redhat.com>

	* gas/msp430/errata_fixes.s: New test source file.
	* gas/msp430/errata_fixes.d: New test control file.
	* gas/msp430/errata_warns.s: New test source file.
	* gas/msp430/errata_warns.d: New test control file.
	* gas/msp430/errata_warns.l: New test message file.
	* gas/msp430/msp430.exp: Run the new tests.
	* gas/msp430/bad.l: Update expected warning messages
	* gas/msp430/msp430.exp: Run the new tests.

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