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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