powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR

Message-ID: <20210412112218.128183-2-ravi.bangoria@linux.ibm.com> (raw)

Add selftests to test multiple active DAWRs with ptrace interface.

Sample o/p:
  $ ./ptrace-hwbreak
  ...
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO, len: 6: Ok

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
[mpe: Fix build on older distros]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>