diff options
| 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/include | |
| parent | 9151dde40356880bb445f719f5ebbb1319054d5f (diff) | |
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/include')
| -rw-r--r-- | arch/loongarch/include/asm/ftrace.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h new file mode 100644 index 000000000000..c3f5cde40464 --- /dev/null +++ b/arch/loongarch/include/asm/ftrace.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2022 Loongson Technology Corporation Limited + */ + +#ifndef _ASM_LOONGARCH_FTRACE_H +#define _ASM_LOONGARCH_FTRACE_H + +#ifdef CONFIG_FUNCTION_TRACER + +#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ + +#ifndef __ASSEMBLY__ +#define mcount _mcount +extern void _mcount(void); +extern void prepare_ftrace_return(unsigned long self_addr, unsigned long callsite_sp, unsigned long old); +#endif /* __ASSEMBLY__ */ + +#endif /* CONFIG_FUNCTION_TRACER */ + +#endif /* _ASM_LOONGARCH_FTRACE_H */ |