[PATCH v3 00/14] Initial Prefixed Instruction support

[Jordan Niethe]

A future revision of the ISA will introduce prefixed instructions. A
prefixed instruction is composed of a 4-byte prefix followed by a
4-byte suffix.

All prefixes have the major opcode 1. A prefix will never be a valid
word instruction. A suffix may be an existing word instruction or a
new instruction.

This series enables prefixed instructions and extends the instruction
emulation to support them. Then the places where prefixed instructions
might need to be emulated are updated.

v3 is based on feedback from Christophe Leroy. The major changes:
    - Completely replacing store_inst() with patch_instruction() in
      xmon
    - Improve implementation of mread_instr() to not use mread().
    - Base the series on top of
      https://patchwork.ozlabs.org/patch/1232619/ as this will effect
      kprobes.
    - Some renaming and simplification of conditionals.

v2 incorporates feedback from Daniel Axtens and and Balamuruhan
S. The major changes are:
    - Squashing together all commits about SRR1 bits
    - Squashing all commits for supporting prefixed load stores
    - Changing abbreviated references to sufx/prfx -> suffix/prefix
    - Introducing macros for returning the length of an instruction
    - Removing sign extension flag from pstd/pld in sstep.c
    - Dropping patch  "powerpc/fault: Use analyse_instr() to check for
      store with updates to sp" from the series, it did not really fit
      with prefixed enablement in the first place and as reported by Greg
      Kurz did not work correctly.

Alistair Popple (1):
  powerpc: Enable Prefixed Instructions

Jordan Niethe (13):
  powerpc: Define new SRR1 bits for a future ISA version
  powerpc sstep: Prepare to support prefixed instructions
  powerpc sstep: Add support for prefixed load/stores
  powerpc sstep: Add support for prefixed fixed-point arithmetic
  powerpc: Support prefixed instructions in alignment handler
  powerpc/traps: Check for prefixed instructions in
    facility_unavailable_exception()
  powerpc/xmon: Remove store_inst() for patch_instruction()
  powerpc/xmon: Add initial support for prefixed instructions
  powerpc/xmon: Dump prefixed instructions
  powerpc/kprobes: Support kprobes on prefixed instructions
  powerpc/uprobes: Add support for prefixed instructions
  powerpc/hw_breakpoints: Initial support for prefixed instructions
  powerpc: Add prefix support to mce_find_instr_ea_and_pfn()

 arch/powerpc/include/asm/kprobes.h    |   5 +-
 arch/powerpc/include/asm/ppc-opcode.h |  13 ++
 arch/powerpc/include/asm/reg.h        |   7 +-
 arch/powerpc/include/asm/sstep.h      |   9 +-
 arch/powerpc/include/asm/uaccess.h    |  25 ++++
 arch/powerpc/include/asm/uprobes.h    |  16 ++-
 arch/powerpc/kernel/align.c           |   8 +-
 arch/powerpc/kernel/dt_cpu_ftrs.c     |  23 ++++
 arch/powerpc/kernel/hw_breakpoint.c   |   9 +-
 arch/powerpc/kernel/kprobes.c         |  43 ++++--
 arch/powerpc/kernel/mce_power.c       |   6 +-
 arch/powerpc/kernel/optprobes.c       |  31 +++--
 arch/powerpc/kernel/optprobes_head.S  |   6 +
 arch/powerpc/kernel/traps.c           |  22 ++-
 arch/powerpc/kernel/uprobes.c         |   4 +-
 arch/powerpc/kvm/book3s_hv_nested.c   |   2 +-
 arch/powerpc/kvm/book3s_hv_rm_mmu.c   |   2 +-
 arch/powerpc/kvm/emulate_loadstore.c  |   2 +-
 arch/powerpc/lib/sstep.c              | 191 +++++++++++++++++++++++++-
 arch/powerpc/lib/test_emulate_step.c  |  30 ++--
 arch/powerpc/xmon/xmon.c              | 140 +++++++++++++++----
 21 files changed, 497 insertions(+), 97 deletions(-)

-- 
2.17.1