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| author | Qing Zhang <zhangqing@loongson.cn> | 2022-12-10 17:40:15 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-14 03:41:53 +0300 |
| commit | dbe3ba3018ec1fc53ea0d0adf0f687f5d438039d (patch) | |
| tree | 1a17fa2645973a8e0c0efe7ee66f58a23c1939ec /arch/loongarch/kernel/Makefile | |
| parent | 9151dde40356880bb445f719f5ebbb1319054d5f (diff) | |
| download | linux-dbe3ba3018ec1fc53ea0d0adf0f687f5d438039d.tar.xz | |
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/kernel/Makefile')
| -rw-r--r-- | arch/loongarch/kernel/Makefile | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile index 86744531b100..3f71bce1c7ce 100644 --- a/arch/loongarch/kernel/Makefile +++ b/arch/loongarch/kernel/Makefile @@ -15,6 +15,14 @@ obj-$(CONFIG_EFI) += efi.o obj-$(CONFIG_CPU_HAS_FPU) += fpu.o +ifdef CONFIG_FUNCTION_TRACER +obj-y += mcount.o ftrace.o +CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_inst.o = $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_time.o = $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_perf_event.o = $(CC_FLAGS_FTRACE) +endif + obj-$(CONFIG_MODULES) += module.o module-sections.o obj-$(CONFIG_STACKTRACE) += stacktrace.o |