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| author | Guo Ren <ren_guo@c-sky.com> | 2018-12-09 14:29:59 +0800 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2018-12-31 23:16:46 +0800 |
| commit | 230c77a5e92a29bf21e98ee35e22b0537f61c55b (patch) | |
| tree | 78aa6ee2843c765edd87b1a9a824f50558c0888a /arch/csky/abiv2 | |
| parent | 17a68777bc883c8044c8b2d40aa112ff4e8a4fb1 (diff) | |
| download | linux-230c77a5e92a29bf21e98ee35e22b0537f61c55b.tar.bz2 | |
csky: basic ftrace supported
When gcc with -pg, it'll add _mcount stub in every function. We need
implement the _mcount in kernel and ftrace depends on stackstrace.
To do: call-graph, dynamic ftrace
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Diffstat (limited to 'arch/csky/abiv2')
| -rw-r--r-- | arch/csky/abiv2/Makefile | 1 | ||||
| -rw-r--r-- | arch/csky/abiv2/mcount.S | 24 |
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/csky/abiv2/Makefile b/arch/csky/abiv2/Makefile index 069ca7276b99..b1d44f6fbcbd 100644 --- a/arch/csky/abiv2/Makefile +++ b/arch/csky/abiv2/Makefile @@ -8,3 +8,4 @@ obj-y += strcmp.o obj-y += strcpy.o obj-y += strlen.o obj-y += strksyms.o +obj-$(CONFIG_FUNCTION_TRACER) += mcount.o diff --git a/arch/csky/abiv2/mcount.S b/arch/csky/abiv2/mcount.S new file mode 100644 index 000000000000..73377d5ddd18 --- /dev/null +++ b/arch/csky/abiv2/mcount.S @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/linkage.h> + +ENTRY (_mcount) + subi sp, 20 + stw a0, (sp, 0) + stw a1, (sp, 4) + stw a2, (sp, 8) + stw a3, (sp, 12) + stw lr, (sp, 16) + mov a1, lr + ldw a0, (sp, 20) + jsri csky_mcount + ldw a0, (sp, 0) + ldw a1, (sp, 4) + ldw a2, (sp, 8) + ldw a3, (sp, 12) + ldw t1, (sp, 16) + ldw lr, (sp, 20) + addi sp, 24 + jmp t1 +END (_mcount) |