[PATCH v2 0/6] ptrace: consolidate PTRACE_SYSEMU handling and add support for arm64

Sudeep Holla sudeep.holla at arm.com
Mon Mar 18 21:49:19 AEDT 2019


This patchset evolved from the discussion in the thread[0][1]. When we
wanted to add PTRACE_SYSEMU support to ARM64, we thought instead of
duplicating what other architectures like x86 and powerpc have done,
let consolidate the existing support and move it to the core as there's
nothing arch specific in it.

	- added comment for empty statement after tracehook_report_syscall_entry
	- dropped x86 change in syscall_slow_exit_work as I had ended
	  up changing logic unintentionally
	- removed spurious change in powerpc moving user_exit()


[0] https://patchwork.kernel.org/patch/10585505/
[1] https://patchwork.kernel.org/patch/10675237/

Sudeep Holla (6):
  ptrace: move clearing of TIF_SYSCALL_EMU flag to core
  ptrace: introduce ptrace_syscall_enter to consolidate PTRACE_SYSEMU handling
  x86: clean up _TIF_SYSCALL_EMU handling using ptrace_syscall_enter hook
  powerpc: use common ptrace_syscall_enter hook to handle _TIF_SYSCALL_EMU
  arm64: add PTRACE_SYSEMU{,SINGLESTEP} definations to uapi headers
  arm64: ptrace: add support for syscall emulation

 arch/arm64/include/asm/thread_info.h |  5 ++-
 arch/arm64/include/uapi/asm/ptrace.h |  3 ++
 arch/arm64/kernel/ptrace.c           |  3 ++
 arch/powerpc/kernel/ptrace.c         | 49 ++++++++++++----------------
 arch/x86/entry/common.c              | 12 ++-----
 arch/x86/kernel/ptrace.c             |  3 --
 include/linux/ptrace.h               |  1 +
 kernel/ptrace.c                      | 26 +++++++++++++++
 8 files changed, 61 insertions(+), 41 deletions(-)


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