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
