[PATCH v2 0/3] Support --enable-newlib-reent-thread-local Newlib configuration option

[Sebastian Huber]

On 21.07.22 10:27, Chris Johns wrote:
> On 21/7/2022 6:21 pm, Sebastian Huber wrote:
>> On 21.07.22 10:16, Chris Johns wrote:
>>> On 21/7/2022 6:11 pm, Sebastian Huber wrote:
>>>> On 21.07.22 10:03, Chris Johns wrote:
>>>>> As an aside, does gdb know about TLS variables and so will `errno` be visible?
>>>> Good question, there seems to be some support missing. For example for
>>>> arm/xilinx_zynq_a9_qemu:
>>>>
>>>> Breakpoint 7, Init (ignored=2118804) at
>>>> /home/EB/sebastian_h/src/rtems/testsuites/samples/fileio/init.c:1169
>>>> 1169      TEST_BEGIN();
>>>> (gdb) watch _tls_errno
>>>> Cannot find thread-local variables on this target
>>>> (gdb) p _tls_errno
>>>> Cannot find thread-local variables on this target
>>> I wonder if we need to configure gdb so it understands how we handle TLS
>>> variables?
>> It could be a Qemu issue. In GDB there is a
>>
>>        /* Check for the TLS register feature.  */
>>        feature = tdesc_find_feature (tdesc, "org.gnu.gdb.arm.tls");
>>
>> However, this is not provided by Qemu.
> Is this something in the remote protocol? I would have thought the ABI would
> define the register?

Yes, I guess this is a part of the machine description provided by the 
server (Qemu). This stuff seems to be quite new (from 2022) added by 
John Baldwin for FreeBSD.

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