Commit 230c77a5 authored by Guo Ren's avatar Guo Ren
Browse files

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: default avatarGuo Ren <ren_guo@c-sky.com>
parent 17a68777

arch/csky/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/csky/abiv2/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/csky/abiv2/mcount.S

0 → 100644
+24 −0
Original line number Diff line number Diff line 
/* 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)

arch/csky/include/asm/ftrace.h

0 → 100644
+9 −0
Original line number Diff line number Diff line 
/* 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 */

arch/csky/kernel/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -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