[PATCH] ARM: use choice for kernel unwinders

From: Stefan Agner
Date: Tue Aug 21 2018 - 18:24:27 EST


While in theory multiple unwinders could be compiled in, it does
not make sense in practise. Use a choice to make the unwinder
selection mutually exclusive and mandatory.

Already before this commit it has not been possible to deselect
FRAME_POINTER. Remove the obsolete comment.

Furthermore, to produce a meaningful backtrace with FRAME_POINTER
enabled the kernel needs a specific function prologue:
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4

To get to the required prologue gcc uses apcs and no-sched-prolog.
This compiler options are not available on clang, and clang is not
able to generate the required prologue. Make the FRAME_POINTER
config symbol depending on !clang.

Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
---
arch/arm/Kconfig.debug | 43 ++++++++++++++++++++++++++----------------
1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 693f84392f1b..ba09e744384a 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -48,30 +48,41 @@ config DEBUG_WX

If in doubt, say "Y".

-# RMK wants arm kernels compiled with frame pointers or stack unwinding.
-# If you know what you are doing and are willing to live without stack
-# traces, you can get a slightly smaller kernel by setting this option to
-# n, but then RMK will have to kill you ;).
-config FRAME_POINTER
- bool
- depends on !THUMB2_KERNEL
- default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
+choice
+ prompt "Choose kernel unwinder"
+ default UNWINDER_ARM if AEABI && !FUNCTION_GRAPH_TRACER
+ default UNWINDER_FRAME_POINTER if !AEABI || FUNCTION_GRAPH_TRACER
+ help
+ This determines which method will be used for unwinding kernel stack
+ traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,
+ livepatch, lockdep, and more.
+
+config UNWINDER_FRAME_POINTER
+ bool "Frame pointer unwinder"
+ depends on !THUMB2_KERNEL && !CC_IS_CLANG
+ select FRAME_POINTER
help
- If you say N here, the resulting kernel will be slightly smaller and
- faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
- when a problem occurs with the kernel, the information that is
- reported is severely limited.
+ This option enables the frame pointer unwinder for unwinding
+ kernel stack traces.

-config ARM_UNWIND
- bool "Enable stack unwinding support (EXPERIMENTAL)"
+config UNWINDER_ARM
+ bool "ARM EABI stack unwinder"
depends on AEABI
- default y
+ select ARM_UNWIND
help
This option enables stack unwinding support in the kernel
using the information automatically generated by the
compiler. The resulting kernel image is slightly bigger but
the performance is not affected. Currently, this feature
- only works with EABI compilers. If unsure say Y.
+ only works with EABI compilers.
+
+endchoice
+
+config ARM_UNWIND
+ bool
+
+config FRAME_POINTER
+ bool

config OLD_MCOUNT
bool
--
2.18.0