linux-kernel - Re: [PATCH 2/2] perf tools: Introduce regs_query_register

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Date:   Tue, 24 Jan 2017 16:09:08 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Will Deacon <will.deacon@....com>
Cc:     He Kuang <hekuang@...wei.com>, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, mhiramat@...nel.org, wangnan0@...wei.com,
        bintian.wang@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf tools: Introduce regs_query_register_offset()
 for arm64

Em Tue, Jan 24, 2017 at 06:25:18PM +0000, Will Deacon escreveu:
> On Tue, Jan 24, 2017 at 10:30:15AM +0000, He Kuang wrote:
> > Since HAVE_KPROBES can be enabled in arm64, this patch introduces
> > regs_query_register_offset() to convert register name to offset for
> > arm64, so the BPF prologue feature is ready to use.
> > 
> > This patch also changes the 'dwarfnum' to 'offset' in register table,
> > so the related functions are consistent with x86.
> > 
> > Signed-off-by: He Kuang <hekuang@...wei.com>
 
> It would've been nice to have been cc'd on this. In future, please at least
> cc linux-arm-kernel for patches directly changing arm/arm64 code.
 
> > +	GPR_OFFSET_NAME(30),
> > +	{.name = "lr", .offset = offsetof(struct user_pt_regs, regs[30])},
> > +	REG_OFFSET_NAME(sp),
 
> Don't sp and lr need the leading '%'?
 
> > +	REG_OFFSET_NAME(pc),
> > +	REG_OFFSET_NAME(pstate),
 
> The AArch64 DWARF spec says that DWARF register 32 is "RESERVED" and
> register 33 is the ELR, so these pc/pstate entries are wrong.
 
> However, with those changes, I think this patch can simply be ignored and
> mainline is doing the right thing.

Ok, thanks for checking, dropping this patch then.

- Arnaldo