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| author | Qing Zhang <zhangqing@loongson.cn> | 2022-08-06 10:10:02 +0200 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-08-12 07:10:11 +0200 |
| commit | 49232773d8233ed70c4998851bc84e465fc1c788 (patch) | |
| tree | eb361dbb849c68b079022e025e755cdb17a1f10c /arch/loongarch/Kconfig.debug | |
| parent | LoongArch: Add vDSO syscall __vdso_getcpu() (diff) | |
| download | linux-49232773d8233ed70c4998851bc84e465fc1c788.tar.xz linux-49232773d8233ed70c4998851bc84e465fc1c788.zip | |
LoongArch: Add guess unwinder support
Name "guess unwinder" comes from x86, it scans the stack and reports
every kernel text address it finds.
Unwinders can be used by dump_stack() and other stacktrace functions.
Three stages when we do unwind,
1) unwind_start(), the prapare of unwinding, fill unwind_state.
2) unwind_done(), judge whether the unwind process is finished or not.
3) unwind_next_frame(), unwind the next frame.
Add get_stack_info() to get stack info. At present we have irq stack and
task stack. The next_sp is the key info between two types of stacks.
Dividing unwinder helps to add new unwinders in the future.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/Kconfig.debug')
| -rw-r--r-- | arch/loongarch/Kconfig.debug | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/loongarch/Kconfig.debug b/arch/loongarch/Kconfig.debug index e69de29bb2d1..68634d4fa27b 100644 --- a/arch/loongarch/Kconfig.debug +++ b/arch/loongarch/Kconfig.debug @@ -0,0 +1,9 @@ +config UNWINDER_GUESS + bool "Guess unwinder" + help + This option enables the "guess" unwinder for unwinding kernel stack + traces. It scans the stack and reports every kernel text address it + finds. Some of the addresses it reports may be incorrect. + + While this option often produces false positives, it can still be + useful in many cases. |