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| author | Qing Zhang <zhangqing@loongson.cn> | 2022-12-10 22:40:15 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-14 08:41:53 +0800 |
| commit | dbe3ba3018ec1fc53ea0d0adf0f687f5d438039d (patch) | |
| tree | 1a17fa2645973a8e0c0efe7ee66f58a23c1939ec /arch/loongarch/Kconfig | |
| parent | 9151dde40356880bb445f719f5ebbb1319054d5f (diff) | |
| download | linux-dbe3ba3018ec1fc53ea0d0adf0f687f5d438039d.tar.bz2 | |
LoongArch/ftrace: Add basic support
This patch contains basic ftrace support for LoongArch. Specifically,
function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_
FUNCTION_GRAPH_TRACER) are implemented following the instructions in
Documentation/trace/ftrace-design.txt.
Use `-pg` makes stub like a child function `void _mcount(void *ra)`.
Thus, it can be seen store RA and alloc stack before `call _mcount`.
Find `alloc stack` at first, and then find `store RA`.
Note that the functions in both inst.c and time.c should not be hooked
with the compiler's -pg option: to prevent infinite self-referencing for
the former, and to ignore early setup stuff for the latter.
Co-developed-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/Kconfig')
| -rw-r--r-- | arch/loongarch/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 28d827c6abb3..72a41e08f9f4 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -90,6 +90,8 @@ config LOONGARCH select HAVE_EBPF_JIT select HAVE_EXIT_THREAD select HAVE_FAST_GUP + select HAVE_FUNCTION_GRAPH_TRACER + select HAVE_FUNCTION_TRACER select HAVE_GENERIC_VDSO select HAVE_IOREMAP_PROT select HAVE_IRQ_EXIT_ON_IRQ_STACK |