Re: [PATCH v3 00/16] objtool: Enable and implement --mcount option on powerpc

On Mon, Sep 12, 2022 at 01:50:04PM +0530, Sathvika Vasireddy wrote:

Christophe Leroy (4):
  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 (12):
  objtool: Add --mnop as an option to --mcount
  objtool: Read special sections with alts only when specific options are selected
  objtool: Use macros to define arch specific reloc types
  objtool: Add arch specific function arch_ftrace_match()
  objtool/powerpc: Enable objtool to be built on ppc
  objtool/powerpc: Add --mcount specific implementation

 tools/objtool/arch/powerpc/Build              |   2 +
 tools/objtool/arch/powerpc/decode.c           | 101 ++++++++++++++++++
 .../arch/powerpc/include/arch/cfi_regs.h      |  11 ++
 tools/objtool/arch/powerpc/include/arch/elf.h |  10 ++
 .../arch/powerpc/include/arch/special.h       |  21 ++++
 tools/objtool/arch/powerpc/special.c          |  19 ++++
 tools/objtool/arch/x86/decode.c               |   5 +
 tools/objtool/arch/x86/include/arch/elf.h     |   2 +
 .../arch/x86/include/arch/endianness.h        |   9 --
 tools/objtool/builtin-check.c                 |  14 +++
 tools/objtool/check.c                         |  53 ++++-----
 tools/objtool/elf.c                           |   8 +-
 tools/objtool/include/objtool/arch.h          |   2 +
 tools/objtool/include/objtool/builtin.h       |   1 +
 tools/objtool/include/objtool/elf.h           |   8 ++
 tools/objtool/include/objtool/endianness.h    |  32 +++---
 tools/objtool/orc_dump.c                      |  11 +-
 tools/objtool/orc_gen.c                       |   4 +-
 tools/objtool/special.c                       |   3 +-

This seems to painlessly merge with the objtool changes I have in
queue.git/call-depth-tracking. After that all I need is the below little
patch to make it to build ppc44x_defconfig + CONFIG_DYNAMIC_FTRACE=y.

So I think these patches can go through the powerpc tree if Michael
wants. Josh you okay with that, or should we do something complicated?

diff --git a/tools/objtool/arch/powerpc/decode.c b/tools/objtool/arch/powerpc/decode.c
index ea2b1968f0ee..8343e2c4cea0 100644
--- a/tools/objtool/arch/powerpc/decode.c
+++ b/tools/objtool/arch/powerpc/decode.c

@@ -24,6 +24,11 @@ bool arch_callee_saved_reg(unsigned char reg)
 	return false;
 }
 
+bool arch_pc_relative_reloc(struct reloc *reloc)
+{
+	exit(-1);
+}
+
 int arch_decode_hint_reg(u8 sp_reg, int *base)
 {
 	exit(-1);