[PATCH v3 0/3] Add support for divde[.] and divdeu[.] instruction emulation

[Balamuruhan S <bala24@linux.ibm.com>]

Hi All,

This patchset adds support to emulate divde, divde., divdeu and divdeu.
instructions and testcases for it.

Changes in v3:
-------------
* Fix suggestion from Sandipan to remove `PPC_INST_DIVDE_DOT` and
  `PPC_INST_DIVDEU_DOT` opcode macros defined in ppc-opcode.h, reuse
  `PPC_INST_DIVDE` and `PPC_INST_DIVDEU` in test_emulate_step.c to derive
  them respectively.

Changes in v2:
-------------
* Fix review comments from Paul to make divde_dot and divdeu_dot simple
  by using divde and divdeu, then goto `arith_done` instead of
  `compute_done`.
* Include `Reviewed-by` tag from Sandipan Das.
* Rebase with recent mpe's merge tree.

I would request for your review and suggestions for making it better.

Boot Log:
--------

:: ::
:: ::
[    2.777518] emulate_step_test: divde          : RA = LONG_MIN, RB = LONG_MIN                         PASS
[    2.777882] emulate_step_test: divde          : RA = 1L, RB = 0					PASS
[    2.778432] emulate_step_test: divde          : RA = LONG_MIN, RB = LONG_MAX                         PASS
[    2.778880] emulate_step_test: divde.         : RA = LONG_MIN, RB = LONG_MIN                         PASS
[    2.780172] emulate_step_test: divde.         : RA = 1L, RB = 0					PASS
[    2.780582] emulate_step_test: divde.         : RA = LONG_MIN, RB = LONG_MAX                         PASS
[    2.780983] emulate_step_test: divdeu         : RA = LONG_MIN, RB = LONG_MIN                         PASS
[    2.781276] emulate_step_test: divdeu         : RA = 1L, RB = 0					PASS
[    2.781579] emulate_step_test: divdeu         : RA = LONG_MIN, RB = LONG_MAX                         PASS
[    2.781820] emulate_step_test: divdeu         : RA = LONG_MAX - 1, RB = LONG_MAX                     PASS
[    2.782056] emulate_step_test: divdeu         : RA = LONG_MIN + 1, RB = LONG_MIN                     PASS
[    2.782296] emulate_step_test: divdeu.        : RA = LONG_MIN, RB = LONG_MIN                         PASS
[    2.782556] emulate_step_test: divdeu.        : RA = 1L, RB = 0					PASS
[    2.783502] emulate_step_test: divdeu.        : RA = LONG_MIN, RB = LONG_MAX                         PASS
[    2.783748] emulate_step_test: divdeu.        : RA = LONG_MAX - 1, RB = LONG_MAX                     PASS
[    2.783973] emulate_step_test: divdeu.        : RA = LONG_MIN + 1, RB = LONG_MIN			PASS
[    2.789617] registered taskstats version 1
[    2.794779] printk: console [netcon0] enabled
[    2.794931] netconsole: network logging started
[    2.795327] hctosys: unable to open rtc device (rtc0)
[    2.953449] Freeing unused kernel memory: 5120K
[    2.953639] This architecture does not have kernel memory protection.
[    2.953918] Run /init as init process
[    3.173573] mount (54) used greatest stack depth: 12576 bytes left
[    3.252465] mount (55) used greatest stack depth: 12544 bytes left

Welcome to Buildroot
buildroot login:

Balamuruhan S (3):
  powerpc ppc-opcode: add divde and divdeu opcodes
  powerpc sstep: add support for divde[.] and divdeu[.] instructions
  powerpc test_emulate_step: add testcases for divde[.] and divdeu[.]
    instructions

 arch/powerpc/include/asm/ppc-opcode.h |   8 ++
 arch/powerpc/lib/sstep.c              |  13 ++-
 arch/powerpc/lib/test_emulate_step.c  | 164 ++++++++++++++++++++++++++++++++++
 3 files changed, 184 insertions(+), 1 deletion(-)


base-commit: 20862247a368dbb75d6e97d82345999adaacf3cc
-- 
2.14.5