[PATCH v6 0/5] Add kprobe and kretprobe support for LoongArch

From: Tiezhu Yang
Date: Wed Nov 30 2022 - 03:20:01 EST


v6:
-- Add a new patch to redefine larch_insn_patch_text() with
stop_machine_cpuslocked()
-- Modify kprobe_breakpoint_handler() to consider the original
insn is break and return the corret value
-- Modify do_bp() to refresh bcode when original insn is break

v5:
-- Rebase on the latest code
-- Use stop_machine_cpuslocked() to modify insn to avoid CPU race

v4:
-- Remove kprobe_exceptions_notify() in kprobes.c
-- Call kprobe_breakpoint_handler() and kprobe_singlestep_handler()
in do_bp()

v3:
-- Rebase on the latest code
-- Check the alignment of PC in simu_branch() and simu_pc()
-- Add ibar in flush_insn_slot()
-- Rename kprobe_{pre,post}_handler() to {post_}kprobe_handler
-- Add preempt_disable() and preempt_enable_no_resched()
-- Remove r0 save/restore and do some minor changes
in kprobes_trampoline.S
-- Do not enable CONFIG_KPROBES by default

v2:
-- Split simu_branch() and simu_pc() into a single patch
-- Call kprobe_page_fault() in do_page_fault()
-- Add kprobes_trampoline.S for kretprobe

Tiezhu Yang (5):
LoongArch: Simulate branch and PC instructions
LoongArch: Use stop_machine_cpuslocked() to modify instruction
LoongArch: Add kprobe support
LoongArch: Add kretprobe support
samples/kprobes: Add LoongArch support

arch/loongarch/Kconfig | 2 +
arch/loongarch/include/asm/inst.h | 27 +++
arch/loongarch/include/asm/kprobes.h | 59 ++++++
arch/loongarch/include/asm/ptrace.h | 1 +
arch/loongarch/kernel/Makefile | 2 +
arch/loongarch/kernel/inst.c | 156 +++++++++++++-
arch/loongarch/kernel/kprobes.c | 328 +++++++++++++++++++++++++++++
arch/loongarch/kernel/kprobes_trampoline.S | 96 +++++++++
arch/loongarch/kernel/traps.c | 13 +-
arch/loongarch/mm/fault.c | 4 +
samples/kprobes/kprobe_example.c | 8 +
11 files changed, 691 insertions(+), 5 deletions(-)
create mode 100644 arch/loongarch/include/asm/kprobes.h
create mode 100644 arch/loongarch/kernel/kprobes.c
create mode 100644 arch/loongarch/kernel/kprobes_trampoline.S

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2.1.0