Commit c2837acf authored by Ravi Bangoria's avatar Ravi Bangoria Committed by Michael Ellerman

selftests/powerpc: Rewrite ptrace-hwbreak.c selftest

ptrace-hwbreak.c selftest is logically broken. On powerpc, when
watchpoint is created with ptrace, signals are generated before
executing the instruction and user has to manually singlestep the
instruction with watchpoint disabled, which selftest never does and
thus it keeps on getting the signal at the same instruction. If we fix
it, selftest fails because the logical connection between
tracer(parent) and tracee(child) is also broken. Rewrite the selftest
and add new tests for unaligned access.

With patch:
  $ ./tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak
  test: ptrace-hwbreak
  tags: git_version:powerpc-5.3-4-224-g218b868240c7-dirty
  PTRACE_SET_DEBUGREG, WO, len: 1: Ok
  PTRACE_SET_DEBUGREG, WO, len: 2: Ok
  PTRACE_SET_DEBUGREG, WO, len: 4: Ok
  PTRACE_SET_DEBUGREG, WO, len: 8: Ok
  PTRACE_SET_DEBUGREG, RO, len: 1: Ok
  PTRACE_SET_DEBUGREG, RO, len: 2: Ok
  PTRACE_SET_DEBUGREG, RO, len: 4: Ok
  PTRACE_SET_DEBUGREG, RO, len: 8: Ok
  PTRACE_SET_DEBUGREG, RW, len: 1: Ok
  PTRACE_SET_DEBUGREG, RW, len: 2: Ok
  PTRACE_SET_DEBUGREG, RW, len: 4: Ok
  PTRACE_SET_DEBUGREG, RW, len: 8: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_EXACT, WO, len: 1: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_EXACT, RO, len: 1: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_EXACT, RW, len: 1: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, RW, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, RW, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, DAR OUTSIDE, RW, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, DAWR_MAX_LEN, RW, len: 512: Ok
  success: ptrace-hwbreak
Signed-off-by: default avatarRavi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191017093204.7511-6-ravi.bangoria@linux.ibm.com
parent 27985b2a
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