[PATCH v2 0/6] perf parse-regs: Refactor architecture functions

[Leo Yan]

This patch series is to refactor arch related functions for register
parsing, which follows up the discussion for v1:
https://lore.kernel.org/lkml/20230520025537.1811986-1-leo.yan@xxxxxxxxxx/

Compared to patch series v1, this patch series introduces new functions
perf_arch_reg_{ip|sp}(), so this can allow the tool to support cross
analysis.

To verify the cross analysis, I used below steps:

- Firstly, I captured perf data on Arm64 machine:

  $ perf record --call-graph fp -- ./test_program

  Or ...

  $ perf record --call-graph dwarf -- ./test_program

  Then, I also archived associated debug data:

  $ perf archive

- Secondly, I copied the perf data file and debug tar file on my x86
  machine:

  $ scp perf.data perf.data.tar.bz2 leoy@IP_ADDRESS:/target/path/

- On x86 machine, I need to build perf for support multi-arch unwinding:

  $ git clone http://git.savannah.gnu.org/r/libunwind.git
  $ cd libunwind
  $ autoreconf -i

  # Build and install libunwind aarch64:
  $ ./configure prefix=/home/leoy/Work/tools/libunwind/install/ \
	--target=aarch64-linux-gnu CC=x86_64-linux-gnu-gcc
  $ make && make install

  # Build and install libunwind x86:
  $ ./configure prefix=/home/leoy/Work/tools/libunwind/install/ \
	--target=x86_64-linux-gnu CC=x86_64-linux-gnu-gcc
  $ make && make install

- Build perf tool for support multi-archs:

  $ cd $LINUX/tools/perf
  $ make VF=1 DEBUG=1 LIBUNWIND_DIR=/home/leoy/Work/tools/libunwind/install

At the end, I verified the x86 perf tool can do cross analysis for aarch64's
perf data file.

Note, I still see x86 perf tool cannot display the complete callgraph
for aarch64, but it should not the issue caused by this series, which
will be addressed by separate patches.

I also built this patch series on my Arm64 and x86 machines, both can
compile perf tool successfully; but I have no chance to build other
archs natively.

Changes from v1:
- For support cross analysis for IP/SP registers, introduced patch 0002
  (James Clark, Ian Rogers).


Leo Yan (6):
  perf parse-regs: Refactor arch register parsing functions
  perf parse-regs: Introduce functions perf_arch_reg_{ip|sp}()
  perf unwind: Use perf_arch_reg_{ip|sp}() to substitute macros
  perf parse-regs: Remove unused macros PERF_REG_{IP|SP}
  perf parse-regs: Remove PERF_REGS_{MAX|MASK} from common code
  perf parse-regs: Move out arch specific header from util/perf_regs.h

 tools/perf/arch/arm/include/perf_regs.h       |   3 -
 tools/perf/arch/arm/util/perf_regs.c          |  11 +
 tools/perf/arch/arm/util/unwind-libdw.c       |   1 +
 tools/perf/arch/arm64/include/perf_regs.h     |   3 -
 tools/perf/arch/arm64/util/machine.c          |   1 +
 tools/perf/arch/arm64/util/perf_regs.c        |   6 +
 tools/perf/arch/arm64/util/unwind-libdw.c     |   1 +
 tools/perf/arch/csky/include/perf_regs.h      |   3 -
 tools/perf/arch/csky/util/perf_regs.c         |  11 +
 tools/perf/arch/csky/util/unwind-libdw.c      |   1 +
 tools/perf/arch/loongarch/include/perf_regs.h |   2 -
 tools/perf/arch/loongarch/util/perf_regs.c    |  11 +
 tools/perf/arch/loongarch/util/unwind-libdw.c |   1 +
 tools/perf/arch/mips/include/perf_regs.h      |   2 -
 tools/perf/arch/mips/util/perf_regs.c         |  11 +
 tools/perf/arch/powerpc/include/perf_regs.h   |   3 -
 tools/perf/arch/powerpc/util/perf_regs.c      |   6 +
 tools/perf/arch/powerpc/util/unwind-libdw.c   |   1 +
 tools/perf/arch/riscv/include/perf_regs.h     |   3 -
 tools/perf/arch/riscv/util/perf_regs.c        |  11 +
 tools/perf/arch/riscv/util/unwind-libdw.c     |   1 +
 tools/perf/arch/s390/include/perf_regs.h      |   3 -
 tools/perf/arch/s390/util/perf_regs.c         |  11 +
 tools/perf/arch/s390/util/unwind-libdw.c      |   1 +
 tools/perf/arch/x86/include/perf_regs.h       |   2 -
 tools/perf/arch/x86/util/perf_regs.c          |   6 +
 tools/perf/arch/x86/util/unwind-libdw.c       |   1 +
 tools/perf/util/Build                         |   1 +
 tools/perf/util/evsel.c                       |   6 +-
 tools/perf/util/libunwind/arm64.c             |   2 -
 tools/perf/util/libunwind/x86_32.c            |   2 -
 tools/perf/util/perf-regs-arch/Build          |   9 +
 .../util/perf-regs-arch/perf_regs_aarch64.c   |  96 +++
 .../perf/util/perf-regs-arch/perf_regs_arm.c  |  60 ++
 .../perf/util/perf-regs-arch/perf_regs_csky.c | 100 +++
 .../util/perf-regs-arch/perf_regs_loongarch.c |  91 +++
 .../perf/util/perf-regs-arch/perf_regs_mips.c |  87 ++
 .../util/perf-regs-arch/perf_regs_powerpc.c   | 145 ++++
 .../util/perf-regs-arch/perf_regs_riscv.c     |  92 +++
 .../perf/util/perf-regs-arch/perf_regs_s390.c |  96 +++
 .../perf/util/perf-regs-arch/perf_regs_x86.c  |  98 +++
 tools/perf/util/perf_regs.c                   | 772 ++----------------
 tools/perf/util/perf_regs.h                   |  49 +-
 tools/perf/util/unwind-libdw.c                |   7 +-
 tools/perf/util/unwind-libunwind-local.c      |   6 +-
 tools/perf/util/unwind.h                      |   8 -
 46 files changed, 1078 insertions(+), 766 deletions(-)
 create mode 100644 tools/perf/util/perf-regs-arch/Build
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_aarch64.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_arm.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_csky.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_loongarch.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_mips.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_powerpc.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_riscv.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_s390.c
 create mode 100644 tools/perf/util/perf-regs-arch/perf_regs_x86.c

-- 
2.34.1