On Thu, 2009-05-28 at 21:13 -0400, Steven Rostedt wrote: > > On Fri, 29 May 2009, wuzhangjin@xxxxxxxxx wrote: > > > From: Wu Zhangjin <wuzj@xxxxxxxxxx> > > > > if -pg of gcc is enabled. a calling to _mcount will be inserted to each > > kernel function. so, there is a possibility to trace the functions in > > _mcount. > > > > here is the implementation of mips specific _mcount for static function > > tracer. > > > > -ffunction-sections option not works with -pg, so disable it if enables > > FUNCTION_TRACER. > > > > Signed-off-by: Wu Zhangjin <wuzj@xxxxxxxxxx> > > --- > > arch/mips/Kconfig | 2 + > > arch/mips/Makefile | 2 + > > arch/mips/include/asm/ftrace.h | 25 ++++++++++- > > arch/mips/kernel/Makefile | 8 +++ > > arch/mips/kernel/mcount.S | 98 ++++++++++++++++++++++++++++++++++++++++ > > arch/mips/kernel/mips_ksyms.c | 5 ++ > > 6 files changed, 139 insertions(+), 1 deletions(-) > > create mode 100644 arch/mips/kernel/mcount.S > > > > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > > index 09b1287..d5c01ca 100644 > > --- a/arch/mips/Kconfig > > +++ b/arch/mips/Kconfig > > @@ -4,6 +4,8 @@ config MIPS > > select HAVE_IDE > > select HAVE_OPROFILE > > select HAVE_ARCH_KGDB > > + select HAVE_FUNCTION_TRACER > > + select HAVE_FUNCTION_TRACE_MCOUNT_TEST > > # Horrible source of confusion. Die, die, die ... > > select EMBEDDED > > select RTC_LIB > > diff --git a/arch/mips/Makefile b/arch/mips/Makefile > > index c4cae9e..f86fb15 100644 > > --- a/arch/mips/Makefile > > +++ b/arch/mips/Makefile > > @@ -48,7 +48,9 @@ ifneq ($(SUBARCH),$(ARCH)) > > endif > > endif > > > > +ifndef CONFIG_FUNCTION_TRACER > > cflags-y := -ffunction-sections > > +endif > > cflags-y += $(call cc-option, -mno-check-zero-division) > > > > ifdef CONFIG_32BIT > > diff --git a/arch/mips/include/asm/ftrace.h b/arch/mips/include/asm/ftrace.h > > index 40a8c17..5f8ebcf 100644 > > --- a/arch/mips/include/asm/ftrace.h > > +++ b/arch/mips/include/asm/ftrace.h > > @@ -1 +1,24 @@ > > -/* empty */ > > +/* > > + * This file is subject to the terms and conditions of the GNU General Public > > + * License. See the file "COPYING" in the main directory of this archive for > > + * more details. > > + * > > + * Copyright (C) 2009 DSLab, Lanzhou University, China > > + * Author: Wu Zhangjin <wuzj@xxxxxxxxxx> > > + */ > > + > > +#ifndef _ASM_MIPS_FTRACE_H > > +#define _ASM_MIPS_FTRACE_H > > + > > +#ifdef CONFIG_FUNCTION_TRACER > > + > > +#define MCOUNT_ADDR ((unsigned long)(_mcount)) > > +#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ > > + > > +#ifndef __ASSEMBLY__ > > +extern void _mcount(void); > > +#define mcount _mcount > > + > > +#endif /* __ASSEMBLY__ */ > > +#endif /* CONFIG_FUNCTION_TRACER */ > > +#endif /* _ASM_MIPS_FTRACE_H */ > > diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile > > index e961221..d167dde 100644 > > --- a/arch/mips/kernel/Makefile > > +++ b/arch/mips/kernel/Makefile > > @@ -8,6 +8,12 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \ > > ptrace.o reset.o setup.o signal.o syscall.o \ > > time.o topology.o traps.o unaligned.o watch.o > > > > +ifdef CONFIG_FUNCTION_TRACER > > +# Do not profile debug and lowlevel utilities > > +CFLAGS_REMOVE_mcount.o = -pg > > mcount.S is an assembly file, the above is for C files. So it is not > needed. Removed, thanks! > > -- Steve > > > +CFLAGS_REMOVE_early_printk.o = -pg > > +endif > > + > > obj-$(CONFIG_CEVT_BCM1480) += cevt-bcm1480.o > > obj-$(CONFIG_CEVT_R4K_LIB) += cevt-r4k.o > > obj-$(CONFIG_MIPS_MT_SMTC) += cevt-smtc.o > > @@ -24,6 +30,8 @@ obj-$(CONFIG_SYNC_R4K) += sync-r4k.o > > obj-$(CONFIG_STACKTRACE) += stacktrace.o > > obj-$(CONFIG_MODULES) += mips_ksyms.o module.o > > > > +obj-$(CONFIG_FUNCTION_TRACER) += mcount.o > > + > > obj-$(CONFIG_CPU_LOONGSON2) += r4k_fpu.o r4k_switch.o > > obj-$(CONFIG_CPU_MIPS32) += r4k_fpu.o r4k_switch.o > > obj-$(CONFIG_CPU_MIPS64) += r4k_fpu.o r4k_switch.o > > diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S > > new file mode 100644 > > index 0000000..268724e > > --- /dev/null
