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authorGuo Ren <ren_guo@c-sky.com>2018-12-09 14:29:59 +0800
committerGuo Ren <ren_guo@c-sky.com>2018-12-31 23:16:46 +0800
commit230c77a5e92a29bf21e98ee35e22b0537f61c55b (patch)
tree78aa6ee2843c765edd87b1a9a824f50558c0888a /arch
parent17a68777bc883c8044c8b2d40aa112ff4e8a4fb1 (diff)
downloadlinux-230c77a5e92a29bf21e98ee35e22b0537f61c55b.tar.gz
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')
-rw-r--r--arch/csky/Kconfig1
-rw-r--r--arch/csky/abiv2/Makefile1
-rw-r--r--arch/csky/abiv2/mcount.S24
-rw-r--r--arch/csky/include/asm/ftrace.h9
-rw-r--r--arch/csky/kernel/Makefile5
-rw-r--r--arch/csky/kernel/ftrace.c24
6 files changed, 64 insertions, 0 deletions
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 65804d1628a8..0b9a290c0157 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -29,6 +29,7 @@ config CSKY
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select HAVE_ARCH_TRACEHOOK
+ select HAVE_FUNCTION_TRACER
select HAVE_GENERIC_DMA_COHERENT
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZO
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-$(CONFIG_FUNCTION_TRACER) += mcount.o
diff --git a/arch/csky/abiv2/mcount.S b/arch/csky/abiv2/mcount.S
new file mode 100644
index 000000000000..73377d5ddd18
--- /dev/null
+++ b/arch/csky/abiv2/mcount.S
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/linkage.h>
+
+ENTRY (_mcount)
+ subi sp, 20
+ stw a0, (sp, 0)
+ stw a1, (sp, 4)
+ stw a2, (sp, 8)
+ stw a3, (sp, 12)
+ stw lr, (sp, 16)
+ mov a1, lr
+ ldw a0, (sp, 20)
+ jsri csky_mcount
+ ldw a0, (sp, 0)
+ ldw a1, (sp, 4)
+ ldw a2, (sp, 8)
+ ldw a3, (sp, 12)
+ ldw t1, (sp, 16)
+ ldw lr, (sp, 20)
+ addi sp, 24
+ jmp t1
+END (_mcount)
diff --git a/arch/csky/include/asm/ftrace.h b/arch/csky/include/asm/ftrace.h
new file mode 100644
index 000000000000..1d22a1787b8b
--- /dev/null
+++ b/arch/csky/include/asm/ftrace.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_FTRACE_H
+#define __ASM_CSKY_FTRACE_H
+
+extern void _mcount(unsigned long from_pc);
+
+#endif /* __ASM_CSKY_FTRACE_H */
diff --git a/arch/csky/kernel/Makefile b/arch/csky/kernel/Makefile
index ba5ca486f0f6..3c0e2d15d4e0 100644
--- a/arch/csky/kernel/Makefile
+++ b/arch/csky/kernel/Makefile
@@ -6,4 +6,9 @@ obj-y += process.o cpu-probe.o ptrace.o dumpstack.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
+
+ifdef CONFIG_FUNCTION_TRACER
+CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
+endif
diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c
new file mode 100644
index 000000000000..ad054f7190f9
--- /dev/null
+++ b/arch/csky/kernel/ftrace.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/ftrace.h>
+#include <linux/uaccess.h>
+
+extern void (*ftrace_trace_function)(unsigned long, unsigned long,
+ struct ftrace_ops*, struct pt_regs*);
+
+
+noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct pt_regs *regs)
+{
+ asm volatile ("\n");
+}
+
+noinline void csky_mcount(unsigned long from_pc, unsigned long self_pc)
+{
+ if (ftrace_trace_function != ftrace_stub)
+ ftrace_trace_function(self_pc, from_pc, NULL, NULL);
+}
+
+/* _mcount is defined in abi's mcount.S */
+EXPORT_SYMBOL(_mcount);