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Date: Wed, 1 Feb 2023 17:40:36 +0800
From: Jeff Xie <xiehuan09@...il.com>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>,
WANG Xuerui <kernel@...0n.name>,
Masami Hiramatsu <mhiramat@...nel.org>,
loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 0/5] Add kprobe and kretprobe support for LoongArch
On Wed, Feb 1, 2023 at 12:56 PM Huacai Chen <chenhuacai@...nel.org> wrote:
>
> Hi, Jeff,
>
> Could you please pay some time to test this series? Thank you.
Thanks for notifying me about the test.
I have tested the patchset(based on the
https://github.com/loongson/linux/tree/loongarch-next),
I found that some functions can't be probed e.g. scheduler_tick() or
uart_write_wakeup()
the two functions have the same point, they are all run in the hardirq context.
I don't know if it's related to the hardirq context, I haven't had
time to study this patchset carefully.
and they can be probed in the x86_64 arch.
root@...ngarch modules]# insmod ./kprobe_example.ko symbol=scheduler_tick
insmod: can't insert './kprobe_example.ko': invalid parameter
dmesg:
[ 39.806435] kprobe_init: register_kprobe failed, returned -22
>
> Huacai
>
> On Wed, Jan 18, 2023 at 11:30 AM Huacai Chen <chenhuacai@...nel.org> wrote:
> >
> > Hi, Masami,
> >
> > Could you please pay some time to review this series? Thank you.
> >
> > Huacai
> >
> > On Wed, Jan 18, 2023 at 10:01 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> > >
> > > v12:
> > > -- Rebase on the latest code
> > > -- Fix -Wmissing-prototypes warning when make W=1
> > > -- Drop patch #6 "Use common function sign_extend64()"
> > > since it has been applied yet
> > >
> > > 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 (5):
> > > 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
> > >
> > > arch/loongarch/Kconfig | 2 +
> > > arch/loongarch/include/asm/asm.h | 10 +
> > > arch/loongarch/include/asm/inst.h | 20 ++
> > > arch/loongarch/include/asm/kprobes.h | 61 +++++
> > > arch/loongarch/include/asm/ptrace.h | 1 +
> > > arch/loongarch/kernel/Makefile | 2 +
> > > 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 +
> > > 14 files changed, 741 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
> > >
> > > --
> > > 2.1.0
> > >
> > >
--
Thanks,
JeffXie
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