xtensa: add static function tracer support (478ba61a) · Commits · e / devices / android_kernel_fairphone_FP4

arch/xtensa/Kconfig

+1 −0

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	@@ -19,6 +19,7 @@ config XTENSA
	select CLONE_BACKWARDS		select CLONE_BACKWARDS
	select IRQ_DOMAIN		select IRQ_DOMAIN
	select HAVE_OPROFILE		select HAVE_OPROFILE
			select HAVE_FUNCTION_TRACER
	help		help
	Xtensa processors are 32-bit RISC machines designed by Tensilica		Xtensa processors are 32-bit RISC machines designed by Tensilica
	primarily for embedded systems. These processors are both		primarily for embedded systems. These processors are both

+7 −0

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	@@ -7,6 +7,13 @@ zlib := inffast.c inflate.c inftrees.c
	lib-y += $(zlib:.c=.o) zmem.o		lib-y += $(zlib:.c=.o) zmem.o

	ccflags-y := -Ilib/zlib_inflate		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 $@		quiet_cmd_copy_zlib = COPY $@
	cmd_copy_zlib = cat $< > $@		cmd_copy_zlib = cat $< > $@

+15 −2

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	@@ -13,6 +13,7 @@
	#include <asm/processor.h>		#include <asm/processor.h>

	#define HAVE_ARCH_CALLER_ADDR		#define HAVE_ARCH_CALLER_ADDR
			#ifndef __ASSEMBLY__
	#define CALLER_ADDR0 ({ unsigned long a0, a1; \		#define CALLER_ADDR0 ({ unsigned long a0, a1; \
	__asm__ __volatile__ ( \		__asm__ __volatile__ ( \
	"mov %0, a0\n" \		"mov %0, a0\n" \
	@@ -24,10 +25,22 @@ extern unsigned long return_address(unsigned level);
	#define CALLER_ADDR1 return_address(1)		#define CALLER_ADDR1 return_address(1)
	#define CALLER_ADDR2 return_address(2)		#define CALLER_ADDR2 return_address(2)
	#define CALLER_ADDR3 return_address(3)		#define CALLER_ADDR3 return_address(3)
	#else		#else /* CONFIG_FRAME_POINTER */
	#define CALLER_ADDR1 (0)		#define CALLER_ADDR1 (0)
	#define CALLER_ADDR2 (0)		#define CALLER_ADDR2 (0)
	#define CALLER_ADDR3 (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 */		#endif /* _XTENSA_FTRACE_H */

+1 −0

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	@@ -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_KGDB) += xtensa-stub.o
	obj-$(CONFIG_PCI) += pci.o		obj-$(CONFIG_PCI) += pci.o
	obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o		obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
			obj-$(CONFIG_FUNCTION_TRACER) += mcount.o

	AFLAGS_head.o += -mtext-section-literals		AFLAGS_head.o += -mtext-section-literals

0 → 100644

+50 −0

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			/*
			* 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)