Re: Stack segments for Aarch64

[Luis Machado via Gdb <gdb@sourceware.org>]

Hi,

On 6/6/24 10:33, Phil Phil wrote:
> GDB 12.1 coredump post mortem coredump debugging on an x64 Linux desktop.  I do not see a perms column in info proc mappings.
> 

Ah, so it is corefile debugging. Checking on my end, I don't see the permissions column either. Now it escapes me if we have any
special reason for that or if it is just an oversight somewhere. As for the stack marker, I suppose we lose that reference
when the corefile is generated. That reference comes from /proc/<pid>/maps when we do "info proc mapping".

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> *From:* Luis Machado <luis.machado@arm.com>
> *Sent:* Thursday, June 6, 2024 9:23 AM
> *To:* Phil Phil <heidegg@hotmail.com>; gdb@sourceware.org <gdb@sourceware.org>
> *Subject:* Re: Stack segments for Aarch64
>  
> Hi,
> 
> On 6/6/24 10:17, Phil Phil via Gdb wrote:
>> Greetings,
>> 
>> I'm trying get some memory info on an Aarch64 for a coredump. The aarch64 gdb produces this output for info proc mappings
>> 
>>           Start Addr           End Addr       Size     Offset objfile
>>         0x557ead9000       0x5582dee000  0x4315000        0x0 /usr/bin/myproc
>>         0x5582dfe000       0x5582f0a000   0x10c000  0x4315000 /usr/bin/myproc
>>         0x5582f0a000       0x5582f24000    0x1a000  0x4421000 /usr/bin/myproc
>> 
>> I'm missing at least two things here compared to the x64 output:
>> 
>> 
>>   *
>> No read/write permissions
>>   *
>> Stack segments are not shown.
>> 
>> Any ideas on how to make these two things visible on Aarch64?
>> 
>> Regards
> 
> What aarch64 debugging setup do you have? Versions etc? Remote?
> 
> For me, running native gdb on aarch64:
> 
> process 1681741
> Mapped address spaces:
> 
>           Start Addr           End Addr       Size     Offset  Perms  objfile
>       0xaaaaaaaa0000     0xaaaaac3c6000  0x1926000        0x0  r-xp   /home/ubuntu/work/build/binutils-gdb-master/gdb/gdb
>       0xaaaaac3d5000     0xaaaaacd2a000   0x955000  0x1925000  r--p   /home/ubuntu/work/build/binutils-gdb-master/gdb/gdb
>       0xaaaaacfc6000     0xaaaaad069000    0xa3000        0x0  rw-p   [heap]
> ...
>       0xfffffffdf000    0x1000000000000    0x21000        0x0  rw-p   [stack]