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* [PATCH v11 0/6] Add kprobe and kretprobe support for LoongArch
@ 2023-01-14  9:27 Tiezhu Yang
  2023-01-14  9:27 ` [PATCH v11 1/6] LoongArch: Simulate branch and PC* instructions Tiezhu Yang
                   ` (5 more replies)
  0 siblings, 6 replies; 10+ messages in thread
From: Tiezhu Yang @ 2023-01-14  9:27 UTC (permalink / raw)
  To: Huacai Chen, WANG Xuerui, Masami Hiramatsu; +Cc: loongarch, linux-kernel

v11:
  -- Rebase on the latest code
  -- Address all the review comments, thank you all
  -- Modify arch_prepare_kprobe() and setup_singlestep()
     to make the probe logic more clear
  -- Mark some assembler symbols as non-kprobe-able
  -- Use common function sign_extend64()
  -- Test 20 times about 36 hours for all the 71 assembler
     functions annotated with SYM_CODE_START and SYM_FUNC_START
     under arch/loongarch, especially test memset alone for 10
     hours, no hang problems

v10:
  -- Remove sign_extend() based on the latest code
  -- Rename insns_are_not_supported() to insns_not_supported()
  -- Rename insns_are_not_simulated() to insns_not_simulated()
  -- Set KPROBE_HIT_SSDONE if cur->post_handler is not NULL
  -- Enable preemption for KPROBE_REENTER in kprobe_fault_handler()

v9:
  -- Rename sign_extended() to sign_extend()
  -- Modify kprobe_fault_handler() to handle all of kprobe_status

v8:
  -- Put "regs->csr_prmd &= ~CSR_PRMD_PIE;" ahead to save one line
  -- Add code comment of preempt_disable()
  -- Put kprobe_page_fault() in __do_page_fault()
  -- Modify the check condition of break insn in kprobe_breakpoint_handler()

v7:
  -- Remove stop_machine_cpuslocked() related code

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 correct 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 (6):
  LoongArch: Simulate branch and PC* instructions
  LoongArch: Add kprobe support
  LoongArch: Add kretprobe support
  LoongArch: Mark some assembler symbols as non-kprobe-able
  samples/kprobes: Add LoongArch support
  LoongArch: Use common function sign_extend64()

 arch/loongarch/Kconfig                     |   2 +
 arch/loongarch/include/asm/asm.h           |  10 +
 arch/loongarch/include/asm/inst.h          |  28 +-
 arch/loongarch/include/asm/kprobes.h       |  58 +++++
 arch/loongarch/include/asm/ptrace.h        |   1 +
 arch/loongarch/kernel/Makefile             |   2 +
 arch/loongarch/kernel/alternative.c        |   6 +-
 arch/loongarch/kernel/entry.S              |   1 +
 arch/loongarch/kernel/inst.c               | 123 +++++++++
 arch/loongarch/kernel/kprobes.c            | 405 +++++++++++++++++++++++++++++
 arch/loongarch/kernel/kprobes_trampoline.S |  96 +++++++
 arch/loongarch/kernel/traps.c              |  11 +-
 arch/loongarch/lib/memcpy.S                |   3 +
 arch/loongarch/mm/fault.c                  |   3 +
 samples/kprobes/kprobe_example.c           |   8 +
 15 files changed, 741 insertions(+), 16 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

-- 
2.1.0


^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2023-01-16  3:19 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-01-14  9:27 [PATCH v11 0/6] Add kprobe and kretprobe support for LoongArch Tiezhu Yang
2023-01-14  9:27 ` [PATCH v11 1/6] LoongArch: Simulate branch and PC* instructions Tiezhu Yang
2023-01-14  9:27 ` [PATCH v11 2/6] LoongArch: Add kprobe support Tiezhu Yang
2023-01-14  9:27 ` [PATCH v11 3/6] LoongArch: Add kretprobe support Tiezhu Yang
2023-01-15 11:17   ` kernel test robot
2023-01-16  3:19     ` Tiezhu Yang
2023-01-14  9:27 ` [PATCH v11 4/6] LoongArch: Mark some assembler symbols as non-kprobe-able Tiezhu Yang
2023-01-14  9:27 ` [PATCH v11 5/6] samples/kprobes: Add LoongArch support Tiezhu Yang
2023-01-14  9:27 ` [PATCH v11 6/6] LoongArch: Use common function sign_extend64() Tiezhu Yang
2023-01-16  3:18   ` Huacai Chen

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