linux-kernel - [RFC PATCH v2 0/7] objtool: Enable and implement --mcount option on powerpc

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Date:   Tue, 24 May 2022 15:17:40 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, peterz@...radead.org,
        aik@...abs.ru, sv@...ux.ibm.com, rostedt@...dmis.org,
        jpoimboe@...hat.com, naveen.n.rao@...ux.vnet.ibm.com,
        mbenes@...e.cz
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v2 0/7] objtool: Enable and implement --mcount option on powerpc

This draft series adds PPC32 support to Sathvika's series.
Verified on pmac32 on QEMU.

It should in principle also work for PPC64 BE but for the time being
something goes wrong. In the beginning I had a segfaut hence the first
patch. But I still get no mcount section in the files.

Christophe Leroy (3):
  objtool: Fix SEGFAULT
  objtool: Use target file endianness instead of a compiled constant
  objtool: Use target file class size instead of a compiled constant

Sathvika Vasireddy (4):
  objtool: Add --mnop as an option to --mcount
  objtool: Enable objtool to run only on files with ftrace enabled
  objtool/powerpc: Enable objtool to be built on ppc
  objtool/powerpc: Add --mcount specific implementation

 Makefile                                      |  4 +-
 arch/powerpc/Kconfig                          |  2 +
 arch/x86/Kconfig                              |  1 +
 scripts/Makefile.build                        |  5 +-
 tools/objtool/arch/powerpc/Build              |  2 +
 tools/objtool/arch/powerpc/decode.c           | 88 +++++++++++++++++++
 .../arch/powerpc/include/arch/cfi_regs.h      | 11 +++
 tools/objtool/arch/powerpc/include/arch/elf.h |  8 ++
 .../arch/powerpc/include/arch/special.h       | 21 +++++
 tools/objtool/arch/powerpc/special.c          | 19 ++++
 .../arch/x86/include/arch/endianness.h        |  9 --
 tools/objtool/builtin-check.c                 | 14 +++
 tools/objtool/check.c                         | 51 ++++++-----
 tools/objtool/elf.c                           | 23 ++++-
 tools/objtool/include/objtool/builtin.h       |  1 +
 tools/objtool/include/objtool/elf.h           |  9 ++
 tools/objtool/include/objtool/endianness.h    | 29 +++---
 tools/objtool/orc_dump.c                      | 11 ++-
 tools/objtool/orc_gen.c                       |  4 +-
 tools/objtool/special.c                       |  3 +-
 20 files changed, 257 insertions(+), 58 deletions(-)
 create mode 100644 tools/objtool/arch/powerpc/Build
 create mode 100644 tools/objtool/arch/powerpc/decode.c
 create mode 100644 tools/objtool/arch/powerpc/include/arch/cfi_regs.h
 create mode 100644 tools/objtool/arch/powerpc/include/arch/elf.h
 create mode 100644 tools/objtool/arch/powerpc/include/arch/special.h
 create mode 100644 tools/objtool/arch/powerpc/special.c
 delete mode 100644 tools/objtool/arch/x86/include/arch/endianness.h

-- 
2.35.3