[PATCH -next 0/2] riscv: ptrace: implement PTRACE_{PEEK,POKE}USR

[Yipeng Zou]

在 2022/10/6 9:26, Palmer Dabbelt 写道:
> On Mon, 22 Aug 2022 01:19:03 PDT (-0700), schwab at suse.de wrote:
>> On Aug 22 2022, Yipeng Zou wrote:
>>
>>> The PTRACE_{PEEK,POKE}USR going to get/set tracee's user register.
>>> This patch sets add PTRACE_{PEEK,POKE}USR and compat implement to
>>> riscv.
>>>
>>> I notice this issuse when transplanting some app form x86 to riscv
>>> recently.
>>> I don't know why these two function are not implemented now, and I
>>> found few talk about that.
>>>
>>> The {PEEK,POKE}USR are both defined in include\uapi\linux\ptrace.h,
>>> So I was thinking maybe these two function shouled be implemented.
>>
>> There are PTRACE_[GS]ETREGSET.  I think PTRACE_{PEEK,POKE}USR are
>> legacy-only.
>
> That's my understanding as well.  Anything ported to RISC-V would need 
> to understand the new register formats, so there's not much benefit to 
> supporting these old flavors of register twiddling -- maybe some 
> refactoring needs to be done in userspace to take advantage of 
> accessing multiple registers at the same time, but that should 
> probably be done anyway as all ports support the new interfaces these 
> days.
>
ok, got it.
> There's been a few rounds of these having been posted, maybe that 
> means the documentation should be improved?  I sent 
> <https://lore.kernel.org/r/20221006012432.19008-1-palmer@rivosinc.com/>, 
> that'll also help sort out whether we're supposed to have these.

-- 
Regards,
Yipeng Zou