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Ravi Bangoria c2837acfbf 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: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191017093204.7511-6-ravi.bangoria@linux.ibm.com

2019-11-13 16:58:03 +11:00

alignment

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30 11:26:32 -07:00

benchmarks

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30 11:29:21 -07:00

cache_shape

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30 11:26:32 -07:00

copyloops

seltests/powerpc: Add a selftest for memcpy_mcsafe