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. The series is based on top of: https://patchwork.ozlabs.org/patch/1232619/ as this will effect kprobes. v4 is based on feedback from Nick Piggins, Christophe Leroy and Daniel Axtens. The major changes: - Move xmon breakpoints from data section to text section - Introduce a data type for instructions on powerpc 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 (15): powerpc/xmon: Remove store_inst() for patch_instruction() xmon: Move out-of-line instructions to text section powerpc: Use a datatype for instructions powerpc: Use a macro for creating instructions from u32s powerpc: Use a function for masking instructions powerpc: Use a function for getting the instruction op code powerpc: Introduce functions for instruction nullity and equality powerpc: Use an accessor for word instructions powerpc: Use a function for reading instructions powerpc: Make test_translate_branch() independent of instruction length powerpc: Define new SRR1 bits for a future ISA version powerpc: Support prefixed instructions in alignment handler powerpc64: Add prefixed instructions to instruction data type powerpc sstep: Add support for prefixed load/stores powerpc sstep: Add support for prefixed fixed-point arithmetic arch/powerpc/include/asm/code-patching.h | 33 +- arch/powerpc/include/asm/inst.h | 143 +++++++ arch/powerpc/include/asm/kprobes.h | 2 +- arch/powerpc/include/asm/reg.h | 7 +- arch/powerpc/include/asm/sstep.h | 15 +- arch/powerpc/include/asm/uaccess.h | 22 ++ arch/powerpc/include/asm/uprobes.h | 6 +- arch/powerpc/kernel/align.c | 13 +- arch/powerpc/kernel/hw_breakpoint.c | 5 +- arch/powerpc/kernel/jump_label.c | 2 +- arch/powerpc/kernel/kprobes.c | 19 +- arch/powerpc/kernel/mce_power.c | 5 +- arch/powerpc/kernel/module_64.c | 2 +- arch/powerpc/kernel/optprobes.c | 68 ++-- arch/powerpc/kernel/optprobes_head.S | 3 + arch/powerpc/kernel/security.c | 8 +- arch/powerpc/kernel/trace/ftrace.c | 179 +++++---- arch/powerpc/kernel/traps.c | 22 +- arch/powerpc/kernel/uprobes.c | 4 +- arch/powerpc/kernel/vmlinux.lds.S | 2 +- arch/powerpc/kvm/book3s_hv_nested.c | 2 +- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 2 +- arch/powerpc/kvm/emulate_loadstore.c | 3 +- arch/powerpc/lib/code-patching.c | 184 ++++----- arch/powerpc/lib/feature-fixups.c | 47 +-- arch/powerpc/lib/sstep.c | 455 ++++++++++++++++------- arch/powerpc/lib/test_emulate_step.c | 56 +-- arch/powerpc/xmon/xmon.c | 93 +++-- 28 files changed, 925 insertions(+), 477 deletions(-) create mode 100644 arch/powerpc/include/asm/inst.h -- 2.17.1
