linux-kernel - Re: [PATCH v15 01/10] arm64: Add HAVE_REGS_AND_STACK_ACCESS

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Message-ID: <20160715150532.GA22563@localhost>
Date:	Fri, 15 Jul 2016 16:13:15 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	David Long <dave.long@...aro.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	Petr Mladek <pmladek@...e.com>,
	Zi Shen Lim <zlim.lnx@...il.com>,
	Will Deacon <will.deacon@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	yalin wang <yalin.wang2010@...il.com>,
	Li Bin <huawei.libin@...wei.com>,
	John Blackwood <john.blackwood@...r.com>,
	Pratyush Anand <panand@...hat.com>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Huang Shijie <shijie.huang@....com>,
	Dave P Martin <Dave.Martin@....com>,
	Jisheng Zhang <jszhang@...vell.com>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Steve Capper <steve.capper@...aro.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Yang Shi <yang.shi@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
	William Cohen <wcohen@...hat.com>,
	Alex Bennée <alex.bennee@...aro.org>,
	Adam Buchbinder <adam.buchbinder@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robin Murphy <robin.murphy@....com>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v15 01/10] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API
 feature

On Fri, Jul 15, 2016 at 10:51:23AM -0400, David Long wrote:
> On 07/15/2016 06:57 AM, Catalin Marinas wrote:
> > On Fri, Jul 08, 2016 at 12:35:45PM -0400, David Long wrote:
> > > --- a/arch/arm64/include/asm/ptrace.h
> > > +++ b/arch/arm64/include/asm/ptrace.h
> > > @@ -74,6 +74,7 @@
> > >   #define COMPAT_PT_DATA_ADDR		0x10004
> > >   #define COMPAT_PT_TEXT_END_ADDR		0x10008
> > >   #ifndef __ASSEMBLY__
> > > +#include <linux/bug.h>
> > > 
> > >   /* sizeof(struct user) for AArch32 */
> > >   #define COMPAT_USER_SZ	296
> > > @@ -119,6 +120,8 @@ struct pt_regs {
> > >   	u64 syscallno;
> > >   };
> > > 
> > > +#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
> > > +
> > >   #define arch_has_single_step()	(1)
> > > 
> > >   #ifdef CONFIG_COMPAT
> > > @@ -147,6 +150,55 @@ struct pt_regs {
> > >   #define user_stack_pointer(regs) \
> > >   	(!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
> > > 
> > > +extern int regs_query_register_offset(const char *name);
> > > +extern const char *regs_query_register_name(unsigned int offset);
> > 
> > Is regs_query_register_offset() used anywhere? I grep'ed the kernel with
> > these patches applied but couldn't find any use.
> 
> It's referenced in kernel/trace/trace_probe.c.

I meant regs_query_register_name() (vim completion wrote the first one).

> > > +extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
> > 
> > This one only seems to be used in arch/arm64/kernel/ptrace.c. Can we
> > make it static and remove the declaration?
> 
> OK.

I can change it locally.

Are these going to be used in the future by uprobes?

-- 
Catalin