Re: [PATCH 6/9] gdb: Implement 'bt shadow' to print the shadow stack backtrace.

[Thiago Jung Bauermann <thiago.bauermann@linaro.org>]

"Schimpe, Christina" <christina.schimpe@intel.com> writes:

>> -----Original Message-----
>> From: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
>> Sent: Mittwoch, 26. November 2025 17:30
>> To: Schimpe, Christina <christina.schimpe@intel.com>
>> Cc: gdb-patches@sourceware.org
>> Subject: Re: [PATCH 6/9] gdb: Implement 'bt shadow' to print the shadow
>> stack backtrace.
>> 
>> Thiago Jung Bauermann <thiago.bauermann@linaro.org> writes:
>> 
>> > "Schimpe, Christina" <christina.schimpe@intel.com> writes:
>> >
>> >> And if not, do you have an idea how we can fix this?
>> >
>> > I suggest adding a gdbarch method which given RANGE, returns how many
>> > entries there are in the shadow stack.
>> 
>> Actually I miswrote. The method shouldn't get the RANGE as argument
>> because then it wouldn't know where the stack ends. It should get the
>> addresses of the first and last elements in the shadow stack.
>> 
>> --
>> Thiago
>
> Hi Thiago, 
>
> Hm, how would we know if we should pass the first or second value of range,
> if we don't know which arch we're on?
> We could examine in which direction the stack grows, but wouldn't it be safer
> if we'd pass SSP and RANGE ? Maybe some arch needs all this information.
>

You're right. I see that's what you did in v2 with the
gdbarch_get_shadow_stack_size hook. Looks great to me. Thanks!

-- 
Thiago