diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2022-01-25 15:55:24 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2022-02-09 09:13:59 +0100 |
| commit | 41918ec82eb6f80c8b401422f27ca76c85aa0cb7 (patch) | |
| tree | 1bd1010a1e6e5a52d3c4ed22d768f863ce10dc6a /arch/arm/Kconfig.debug | |
| parent | 538b9265c063f081ca6b1228d242575a1db60711 (diff) | |
ARM: ftrace: enable the graph tracer with the EABI unwinder
Enable the function graph tracer in combination with the EABI unwinder,
so that Thumb2 builds or Clang ARM builds can make use of it.
This involves using the unwinder to locate the return address of an
instrumented function on the stack, so that it can be overridden and
made to refer to the ftrace handling routines that need to be called at
function return.
Given that for these builds, it is not guaranteed that the value of the
link register is stored on the stack, fall back to the stack slot that
will be used by the ftrace exit code to restore LR in the instrumented
function's execution context.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'arch/arm/Kconfig.debug')
| -rw-r--r-- | arch/arm/Kconfig.debug | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 98436702e0c7..b79dc7fa89bf 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -65,7 +65,7 @@ config UNWINDER_FRAME_POINTER config UNWINDER_ARM bool "ARM EABI stack unwinder" - depends on AEABI && !FUNCTION_GRAPH_TRACER + depends on AEABI # https://github.com/ClangBuiltLinux/linux/issues/732 depends on !LD_IS_LLD || LLD_VERSION >= 110000 select ARM_UNWIND |