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[PATCH v3 00/18] Fast tracepoint support for ARMv7


Hi,

In this v3:

I realized then testing something else that a fast tracepoint in an
infinite loop would crash the inferiror.

So I added patch: "Export tracing control breakpoints functions via global
function pointers"

That fixes this issue.

The intro is also updated, removing the possible single step issue.

--

Here's a link to the original V1
https://sourceware.org/ml/gdb-patches/2015-10/msg00195.html

This series needs to be applied on top of tracepoints support for ARM see:
https://sourceware.org/ml/gdb-patches/2016-01/msg00111.html

This patch enables fast tracepoints for ARM on Linux.

It has been reworked by Simon Marchi and Antoine Tremblay and the
following features have been added:

  * Relocation of many PC relative instructions.

  * JIT compilation of the condition expression.

There are some limitations:

     * The tracepoint insertion will fail if the distance from the
       instruction to the jump pad is big.

     * It is only possible to place fast tracepoints on 4-byte
       instructions, which also limits the valid locations in Thumb mode.

Patches:

Patches 1-9: Share instruction decoding code between GDB and GDBServer so
that it can be used for instruction relocation in GDBServer.

Patch 10: Refactors install_fast_tracepoint_jump_pad to pass a pointer to
the tracepoint, instead of separate arguments.

Patch 11: Enables software single stepping out of the jump pad.

Patch 12: Adds all the functions needed to assemble ARM instructions
needed in the jump pad and in the JIT condition evaluation.

Patch 13: Exports the tracing breakpoint control functions.

Patch 14: Adds fast tracepoint support, without JIT condition evaluation
and PC-relative instructions support.

Patch 15: Adds JIT condition evaluation support.

Patch 16-18: Adds PC-relative instruction relocation support.

Tested on ARMv7 linux {unix, native-gdbserver, native-extended-gdbserver}
no regression observed.


Antoine Tremblay (5):
  Use software single step to step out of a fast tracepoint jump pad
  Add ARM/Thumb instruction assembler for fast tracepoints
  Export tracing control breakpoints functions via global function
    pointers
  Fast tracepoint support for ARM on Linux
  JIT conditions support for ARM tracepoints.

Simon Marchi (13):
  arm-tdep.c: Replace arguments to decode function by a structure
  arm-tdep.c: Refactor displaced stepping relocation functions
  arm-tdep.c: Move debug printout from decode to copy function
  arm-tdep.c: Use relocation visitor in ARM instruction decoding
  arm-tdep.c: Use relocation visitor in Thumb 32-bits instruction
    decoding
  arm-tdep.c: Use relocation visitor in Thumb 16-bits instruction
    decoding
  Move ARM instruction decode functions to arch/arm-insn-reloc.c
  Move Thumb 32 bits instruction decode functions to
    arch/arm-insn-reloc.c
  Move Thumb 16 bits instruction decode functions to
    arch/arm-insn-reloc.c
  gdbserver: pass pointer to struct tracepoint to
    install_fast_tracepoint_jump_pad
  arm: Move insn_references_pc to common code
  arm fast tracepoints: Relocation of ARM instructions
  arm fast tracepoints: Relocation of Thumb 32-bits instructions

 gdb/Makefile.in                                 |   29 +-
 gdb/NEWS                                        |    4 +
 gdb/aarch64-tdep.c                              |    3 +-
 gdb/arch/aarch64-insn.c                         |    3 +-
 gdb/arch/aarch64-insn.h                         |   32 +-
 gdb/arch/arm-insn-emit.c                        | 1550 ++++++++++++++++++
 gdb/arch/arm-insn-emit.h                        | 1087 +++++++++++++
 gdb/arch/arm-insn-reloc.c                       |  881 ++++++++++
 gdb/arch/arm-insn-reloc.h                       |  109 ++
 gdb/arch/arm-insn-utils.c                       |   44 +
 gdb/arch/arm-insn-utils.h                       |   80 +
 gdb/arch/arm.h                                  |    2 +
 gdb/arm-tdep.c                                  | 1464 ++++-------------
 gdb/configure.tgt                               |    7 +-
 gdb/gdbserver/Makefile.in                       |   29 +-
 gdb/gdbserver/configure.srv                     |    8 +
 gdb/gdbserver/linux-aarch32-low.c               |    8 -
 gdb/gdbserver/linux-aarch32-low.h               |    8 +
 gdb/gdbserver/linux-aarch64-low.c               |   80 +-
 gdb/gdbserver/linux-arm-ipa.c                   |  228 +++
 gdb/gdbserver/linux-arm-low.c                   | 1957 ++++++++++++++++++++++-
 gdb/gdbserver/linux-low.c                       |   21 +-
 gdb/gdbserver/linux-low.h                       |    5 +-
 gdb/gdbserver/linux-ppc-low.c                   |   21 +-
 gdb/gdbserver/linux-s390-low.c                  |   13 +-
 gdb/gdbserver/linux-x86-low.c                   |   63 +-
 gdb/gdbserver/target.h                          |   26 +-
 gdb/gdbserver/tracepoint.c                      |  232 +--
 gdb/gdbserver/tracepoint.h                      |  126 ++
 gdb/testsuite/gdb.trace/ftrace-arm-insn.S       |  378 +++++
 gdb/testsuite/gdb.trace/ftrace-arm-insn.c       |   94 ++
 gdb/testsuite/gdb.trace/ftrace-arm-insn.exp     |  111 ++
 gdb/testsuite/gdb.trace/ftrace-flush-buffer.c   |   42 +
 gdb/testsuite/gdb.trace/ftrace-flush-buffer.exp |   98 ++
 gdb/testsuite/lib/trace-support.exp             |    3 +-
 35 files changed, 7357 insertions(+), 1489 deletions(-)
 create mode 100644 gdb/arch/arm-insn-emit.c
 create mode 100644 gdb/arch/arm-insn-emit.h
 create mode 100644 gdb/arch/arm-insn-reloc.c
 create mode 100644 gdb/arch/arm-insn-reloc.h
 create mode 100644 gdb/arch/arm-insn-utils.c
 create mode 100644 gdb/arch/arm-insn-utils.h
 create mode 100644 gdb/gdbserver/linux-arm-ipa.c
 create mode 100644 gdb/testsuite/gdb.trace/ftrace-arm-insn.S
 create mode 100644 gdb/testsuite/gdb.trace/ftrace-arm-insn.c
 create mode 100644 gdb/testsuite/gdb.trace/ftrace-arm-insn.exp
 create mode 100644 gdb/testsuite/gdb.trace/ftrace-flush-buffer.c
 create mode 100644 gdb/testsuite/gdb.trace/ftrace-flush-buffer.exp

-- 
2.8.1


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