objtool: Fix STACK_FRAME_NON_STANDARD macro checking for function symbols
authorJosh Poimboeuf <jpoimboe@redhat.com>
Wed, 15 Jun 2016 20:45:58 +0000 (15:45 -0500)
committerIngo Molnar <mingo@kernel.org>
Sun, 10 Jul 2016 15:15:58 +0000 (17:15 +0200)
commit0ea5ad869c85ac604f3e022bf2c5bef54838433b
tree6e1f6f929a032dfec45fab1f6c320a236899bf50
parentee40fb2948fc99096836995d4f3ddcc0efbac790
objtool: Fix STACK_FRAME_NON_STANDARD macro checking for function symbols

Mathieu Desnoyers reported that the STACK_FRAME_NON_STANDARD macro
wasn't working with the lttng_filter_interpret_bytecode() function in
the lttng-modules code.

Usually the relocation created by STACK_FRAME_NON_STANDARD creates a
reference to a section symbol like this:

  Offset              Type            Value               Addend Name
  000000000000000000  X86_64_64       000000000000000000   +3136 .text

But in this case it created a reference to a function symbol:

  Offset              Type            Value               Addend Name
  000000000000000000  X86_64_64       0x00000000000003a0      +0 lttng_filter_interpret_bytecode

To be honest I have no idea what causes gcc to decide to do one over the
other.  But both are valid ELF, so add support for the function symbol.

Reported-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: lttng-dev@lists.lttng.org
Link: http://lkml.kernel.org/r/9cee42843bc6d94e990a152e4e0319cfdf6756ef.1466023450.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
tools/objtool/builtin-check.c