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Ip=[4.158.2.129]; Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A799.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6727 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org --_000_AS8PR08MB1009915869FFF60CBB8DA52679BC02AS8PR08MB10099eu_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable > >>>> + /* For POE SEGSEGV, show additional information. */ >>> >>> Is this really supposed to be POE SEGSEGV or is it a typo? >>> >> >> For now, in my knowledge, AARCH64_SEGV_PKUERR is only used for POE. >> However, it will also be used soon for another upcoming feature. >> I would recommend to either simply eliminate the comment, or make it mor= e clear like >> >> /* For memory permission faults, e.g. due to a permission overlay >> restriction when feature POE is enabled. */ >> >> Matthieu > >Sorry, I may not have been clear, but I was referring specifically to >the SEGSEGV. Should it be SIGSEGV instead? Yes Luis, that's a typo. It should be SIGSEGV instead of SEGSEGV, thanks fo= r spotting it, I will update in the re-spin. Regarding the comment itself, while SIGSEGV already implies a memory fault, AARCH64_SEGV_PKUERR is currently only generated for Permission Overlay violations. I think something like following would be more accurate descrip= tion. /* Additional information for SIGSEGV caused by a permission overlay violat= ion. */ Regards, Sri. ________________________________ From: Luis Sent: 23 July 2026 00:11 To: Matthieu Longo ; Srinath Parvathaneni ; gdb-patches@sourceware.org Cc: guinevere@redhat.com ; thiago.bauermann@linaro.or= g ; Ezra Sitorus ; simar= k@simark.ca Subject: Re: [PATCH v3 2/5] [PATCH 2/5] gdb: Improve SIGSEGV diagnostics fo= r POE faults On 22/07/2026 10:41, Matthieu Longo wrote: > On 21/07/2026 21:30, Luis wrote: >> On 14/07/2026 21:15, srinath.parvathaneni@arm.com wrote: >>> From: Srinath Parvathaneni >>> >>> diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c >>> index f11eccc1bc1..b8a02ab9972 100644 >>> --- a/gdb/aarch64-linux-tdep.c >>> +++ b/gdb/aarch64-linux-tdep.c >>> @@ -2734,6 +2741,14 @@ aarch64_linux_report_signal_info (struct gdba= rch *gdbarch, >>> uiout->field_string ("logical-tag", hex_string (ltag)); >>> } >>> } >>> + /* For POE SEGSEGV, show additional information. */ >> >> Is this really supposed to be POE SEGSEGV or is it a typo? >> > > For now, in my knowledge, AARCH64_SEGV_PKUERR is only used for POE. > However, it will also be used soon for another upcoming feature. > I would recommend to either simply eliminate the comment, or make it more= clear like > > /* For memory permission faults, e.g. due to a permission overlay > restriction when feature POE is enabled. */ > > Matthieu Sorry, I may not have been clear, but I was referring specifically to the SEGSEGV. Should it be SIGSEGV instead? --_000_AS8PR08MB1009915869FFF60CBB8DA52679BC02AS8PR08MB10099eu_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
>
>>>> +  /* For POE SEGSEGV, show additional information. &= nbsp;*/
>>>
>>> Is this really supposed to be POE SEGSEGV or is it a typo?
>>>
>> 
>> For now, in my knowledge, AARCH64_SEGV_PKUERR is only used for POE= .
>> However, it will also be used soon for another upcoming feature.
>> I would recommend to either simply eliminate the comment, or make = it more clear like
>> 
>> /* For memory permission faults, e.g. due to a permission overlay<= /div>
>>     restriction when feature POE is enabled.  */
>> 
>> Matthieu
>
>Sorry, I may not have been clear, but I was referring specifically to&n= bsp;
>the SEGSEGV. Should it be SIGSEGV instead?

Yes Luis, that's a typo. It should be SIGSEGV instead of SEGSEGV, thanks fo= r
spotting it, I will update in the re-spin.

Regarding the comment itself, while SIGSEGV already implies a memory fault,=
AARCH64_SEGV_PKUERR is currently only generated for Permission Overlay
violations. I think something like following would be more accurate descrip= tion.

/* Additional information for SIGSEGV caused by a permission overlay violat= ion.  */

Regards,
Sri.
From: Luis <luis.machado= .foss@gmail.com>
Sent: 23 July 2026 00:11
To: Matthieu Longo <Matthieu.Longo@arm.com>; Srinath Parvathan= eni <Srinath.Parvathaneni@arm.com>; gdb-patches@sourceware.org <gd= b-patches@sourceware.org>
Cc: guinevere@redhat.com <guinevere@redhat.com>; thiago.bauerm= ann@linaro.org <thiago.bauermann@linaro.org>; Ezra Sitorus <Ezra.S= itorus@arm.com>; simark@simark.ca <simark@simark.ca>
Subject: Re: [PATCH v3 2/5] [PATCH 2/5] gdb: Improve SIGSEGV diagnos= tics for POE faults
 
On 22/07/2026 10:41, Matthieu Longo wrote:
> On 21/07/2026 21:30, Luis wrote:
>> On 14/07/2026 21:15, srinath.parvathaneni@arm.com wrote:
>>> From: Srinath Parvathaneni <srinath.parvathaneni@arm.com>= ;
>>>
>>> diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep= .c
>>> index f11eccc1bc1..b8a02ab9972 100644
>>> --- a/gdb/aarch64-linux-tdep.c
>>> +++ b/gdb/aarch64-linux-tdep.c
>>>    @@ -2734,6 +2741,14 @@ aarch64_linux_report_signa= l_info (struct gdbarch *gdbarch,
>>>          uiout->fie= ld_string ("logical-tag", hex_string (ltag));
>>>        }
>>>        }
>>> +  /* For POE SEGSEGV, show additional information. = */
>>
>> Is this really supposed to be POE SEGSEGV or is it a typo?
>>
>
> For now, in my knowledge, AARCH64_SEGV_PKUERR is only used for POE. > However, it will also be used soon for another upcoming feature.
> I would recommend to either simply eliminate the comment, or make it m= ore clear like
>
> /* For memory permission faults, e.g. due to a permission overlay
>     restriction when feature POE is enabled. = */
>
> Matthieu

Sorry, I may not have been clear, but I was referring specifically to
the SEGSEGV. Should it be SIGSEGV instead?
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