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csky: basic ftrace supported

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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>
This commit is contained in:
Guo Ren 2018-12-09 14:29:59 +08:00
parent 17a68777bc
commit 230c77a5e9
6 changed files with 64 additions and 0 deletions
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1
arch/csky/Kconfig
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@ -29,6 +29,7 @@ config CSKY
select GENERIC_SCHED_CLOCK select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD select GENERIC_SMP_IDLE_THREAD
select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRACEHOOK
select HAVE_FUNCTION_TRACER
select HAVE_GENERIC_DMA_COHERENT select HAVE_GENERIC_DMA_COHERENT
select HAVE_KERNEL_GZIP select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZO select HAVE_KERNEL_LZO

1
arch/csky/abiv2/Makefile
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@ -8,3 +8,4 @@ obj-y += strcmp.o
obj-y += strcpy.o obj-y += strcpy.o
obj-y += strlen.o obj-y += strlen.o
obj-y += strksyms.o obj-y += strksyms.o
obj-$(CONFIG_FUNCTION_TRACER) += mcount.o

24
arch/csky/abiv2/mcount.S Normal file
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@ -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)

9
arch/csky/include/asm/ftrace.h Normal file
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@ -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 */

5
arch/csky/kernel/Makefile
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@ -6,4 +6,9 @@ obj-y += process.o cpu-probe.o ptrace.o dumpstack.o
obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_STACKTRACE) += stacktrace.o
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
endif

24
arch/csky/kernel/ftrace.c Normal file
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@ -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);