Commit 478ba61a authored by Max Filippov's avatar Max Filippov Committed by Chris Zankel
Browse files

xtensa: add static function tracer support 



Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent 220f5354

arch/xtensa/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ config XTENSA 
	select CLONE_BACKWARDS

	select IRQ_DOMAIN

	select HAVE_OPROFILE

	select HAVE_FUNCTION_TRACER

	help

	  Xtensa processors are 32-bit RISC machines designed by Tensilica

	  primarily for embedded systems.  These processors are both

arch/xtensa/boot/lib/Makefile

+7 −0
Original line number Diff line number Diff line
@@ -7,6 +7,13 @@ zlib := inffast.c inflate.c inftrees.c 
lib-y	+= $(zlib:.c=.o) zmem.o



ccflags-y	:= -Ilib/zlib_inflate

ifdef CONFIG_FUNCTION_TRACER

CFLAGS_REMOVE_inflate.o = -pg

CFLAGS_REMOVE_zmem.o = -pg

CFLAGS_REMOVE_inftrees.o = -pg

CFLAGS_REMOVE_inffast.o = -pg

endif





quiet_cmd_copy_zlib = COPY    $@

      cmd_copy_zlib = cat $< > $@

arch/xtensa/include/asm/ftrace.h

+15 −2
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <asm/processor.h>



#define HAVE_ARCH_CALLER_ADDR

#ifndef __ASSEMBLY__

#define CALLER_ADDR0 ({ unsigned long a0, a1; \

		__asm__ __volatile__ ( \

			"mov %0, a0\n" \
@@ -24,10 +25,22 @@ extern unsigned long return_address(unsigned level); 
#define CALLER_ADDR1 return_address(1)

#define CALLER_ADDR2 return_address(2)

#define CALLER_ADDR3 return_address(3)

#else

#else /* CONFIG_FRAME_POINTER */

#define CALLER_ADDR1 (0)

#define CALLER_ADDR2 (0)

#define CALLER_ADDR3 (0)

#endif

#endif /* CONFIG_FRAME_POINTER */

#endif /* __ASSEMBLY__ */



#ifdef CONFIG_FUNCTION_TRACER



#define MCOUNT_ADDR ((unsigned long)(_mcount))

#define MCOUNT_INSN_SIZE 3



#ifndef __ASSEMBLY__

extern void _mcount(void);

#define mcount _mcount

#endif /* __ASSEMBLY__ */

#endif /* CONFIG_FUNCTION_TRACER */



#endif /* _XTENSA_FTRACE_H */

arch/xtensa/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ obj-y := align.o coprocessor.o entry.o irq.o pci-dma.o platform.o process.o \ 
obj-$(CONFIG_KGDB) += xtensa-stub.o

obj-$(CONFIG_PCI) += pci.o

obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o

obj-$(CONFIG_FUNCTION_TRACER) += mcount.o



AFLAGS_head.o += -mtext-section-literals

arch/xtensa/kernel/mcount.S

0 → 100644
+50 −0
Original line number Diff line number Diff line 
/*

 * arch/xtensa/kernel/mcount.S

 *

 * Xtensa specific mcount support

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2013 Tensilica Inc.

 */



#include <linux/linkage.h>

#include <asm/ftrace.h>



/*

 * Entry condition:

 *

 *   a2:	a0 of the caller

 */



ENTRY(_mcount)



	entry	a1, 16



	movi	a4, ftrace_trace_function

	l32i	a4, a4, 0

	movi	a3, ftrace_stub

	bne	a3, a4, 1f

	retw



1: 	xor	a7, a2, a1

	movi	a3, 0x3fffffff

	and	a7, a7, a3

	xor	a7, a7, a1



	xor	a6, a0, a1

	and	a6, a6, a3

	xor	a6, a6, a1

	addi	a6, a6, -MCOUNT_INSN_SIZE

	callx4	a4



	retw



ENDPROC(_mcount)



ENTRY(ftrace_stub)

	entry	a1, 16

	retw

ENDPROC(ftrace_stub)