[Bug gdb/30340] gdb.base/watchpoint-unaligned.exp produces TCL error

["luis.machado at arm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30340

--- Comment #8 from Luis Machado <luis.machado at arm dot com> ---
Thanks!

The ptrace requests for the debug registers seem to be going through just fine:

ptrace(PTRACE_GETREGSET, 1832792, NT_ARM_HW_WATCH, {iov_base=0xffffc0ea3b88,
iov_len=264}) = 0

ptrace(PTRACE_GETREGSET, 1832792, NT_ARM_HW_BREAK, {iov_base=0xffffc0ea3b88,
iov_len=264}) = 0

I think this rules out permissions issues with ptrace, and we're back at
suspecting the architecture level comparisons.

Since you have ready access to the hardware, would you mind running a quick
check on your side?

In gdb/nat/aarch64-linux-hw-point.c:compatible_debug_arch, could you please add
a warning statement printing the debug_arch? Like we do for example in
aarch64_linux_get_debug_reg_capacity when printing the number of
watchpoints/breakpoints.

Then rebuild gdb, run the test (to create the test executable) and attempt to
run that same command line we used for strace.

Could you then paste the architecture level that is printed?

Also, could you please paste the output of "cat /proc/cpuinfo"?

Thanks!

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