[Bug 2012509] Re: unable to fetch pauth registers: Invalid argument.

[Heinrich Schuchardt]

https://lore.kernel.org/all/20181207183931.4285-8-kristina.martsenko@arm.com/
introduced hwcaps PACA (for address authentication) and PACG (for generic
authentication). These are present in /proc/cpuinfo:

Features:
fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp uscat ilrcpc flagm paca pacg

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Title:
  unable to fetch pauth registers: Invalid argument.

Status in gdb package in Ubuntu:
  New

Bug description:
  I am running Ubuntu Lunar on an arm64 Lenovo X13s using the kernel
  6.2.0-1003-laptop from ppa:ubuntu-concept/x13s. The kernel is
  configured with CONFIG_ARM64_PTR_AUTH=y.

  Debugging a trivial hello world program fails:

  GNU gdb (Ubuntu 13.1-2ubuntu2) 13.1
  Reading symbols from ./test...
  (gdb) r
  Starting program: /home/user/temp/test 
  unable to fetch pauth registers: Invalid argument.

  The message relates to this statement:

  gdb/aarch64-linux-nat.c:371:
  ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_PAC_MASK, &iovec);

  When using

  set tdesc filename target.xml

  with a target.xml file without the org.gnu.gdb.aarch64.pauth feature
  debugging works fine.

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