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Commit d75f054a authored by Helge Deller's avatar Helge Deller Committed by Kyle McMartin
Browse files

parisc: add ftrace (function and graph tracer) functionality 



This patch adds the ftrace debugging functionality to the parisc kernel.
It will currently only work with 64bit kernels, because the gcc options -pg
and -ffunction-sections can't be enabled at the same time and -ffunction-sections
is still needed to be able to link 32bit kernels.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarKyle McMartin <kyle@mcmartin.ca>
parent 803094f4

arch/parisc/Kconfig

+3 −0
Original line number Original line Diff line number Diff line
@@ -9,6 +9,9 @@ config PARISC 
	def_bool y

	def_bool y

	select HAVE_IDE

	select HAVE_IDE

	select HAVE_OPROFILE

	select HAVE_OPROFILE

	select HAVE_FUNCTION_TRACER if 64BIT

	select HAVE_FUNCTION_GRAPH_TRACER if 64BIT

	select HAVE_FUNCTION_TRACE_MCOUNT_TEST if 64BIT

	select RTC_CLASS

	select RTC_CLASS

	select RTC_DRV_PARISC

	select RTC_DRV_PARISC

	select INIT_ALL_POSSIBLE

	select INIT_ALL_POSSIBLE

arch/parisc/Makefile

+3 −1
Original line number Original line Diff line number Diff line
@@ -56,7 +56,9 @@ cflags-y += -mdisable-fpregs 




# Without this, "ld -r" results in .text sections that are too big

# Without this, "ld -r" results in .text sections that are too big

# (> 0x40000) for branches to reach stubs.

# (> 0x40000) for branches to reach stubs.

ifndef CONFIG_FUNCTION_TRACER

  cflags-y	+= -ffunction-sections

  cflags-y	+= -ffunction-sections

endif





# select which processor to optimise for

# select which processor to optimise for

cflags-$(CONFIG_PA7100)		+= -march=1.1 -mschedule=7100

cflags-$(CONFIG_PA7100)		+= -march=1.1 -mschedule=7100

arch/parisc/include/asm/ftrace.h

0 → 100644
+25 −0
Original line number Original line Diff line number Diff line 
#ifndef _ASM_PARISC_FTRACE_H

#define _ASM_PARISC_FTRACE_H



#ifndef __ASSEMBLY__

extern void mcount(void);



/*

 * Stack of return addresses for functions of a thread.

 * Used in struct thread_info

 */

struct ftrace_ret_stack {

	unsigned long ret;

	unsigned long func;

	unsigned long long calltime;

};



/*

 * Primary handler of a function return.

 * It relays on ftrace_return_to_handler.

 * Defined in entry.S

 */

extern void return_to_handler(void);

#endif /* __ASSEMBLY__ */



#endif /* _ASM_PARISC_FTRACE_H */

arch/parisc/kernel/Makefile

+14 −0
Original line number Original line Diff line number Diff line
@@ -11,6 +11,18 @@ obj-y := cache.o pacache.o setup.o traps.o time.o irq.o \ 
		   process.o processor.o pdc_cons.o pdc_chassis.o unwind.o \

		   process.o processor.o pdc_cons.o pdc_chassis.o unwind.o \

		   topology.o

		   topology.o





ifdef CONFIG_FUNCTION_TRACER

# Do not profile debug and lowlevel utilities

CFLAGS_REMOVE_ftrace.o = -pg

CFLAGS_REMOVE_cache.o = -pg

CFLAGS_REMOVE_irq.o = -pg

CFLAGS_REMOVE_pacache.o = -pg

CFLAGS_REMOVE_perf.o = -pg

CFLAGS_REMOVE_traps.o = -pg

CFLAGS_REMOVE_unaligned.o = -pg

CFLAGS_REMOVE_unwind.o = -pg

endif



obj-$(CONFIG_SMP)	+= smp.o

obj-$(CONFIG_SMP)	+= smp.o

obj-$(CONFIG_PA11)	+= pci-dma.o

obj-$(CONFIG_PA11)	+= pci-dma.o

obj-$(CONFIG_PCI)	+= pci.o

obj-$(CONFIG_PCI)	+= pci.o
@@ -19,3 +31,5 @@ obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o 
obj-$(CONFIG_STACKTRACE)+= stacktrace.o

obj-$(CONFIG_STACKTRACE)+= stacktrace.o

# only supported for PCX-W/U in 64-bit mode at the moment

# only supported for PCX-W/U in 64-bit mode at the moment

obj-$(CONFIG_64BIT)	+= perf.o perf_asm.o

obj-$(CONFIG_64BIT)	+= perf.o perf_asm.o

obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o

obj-$(CONFIG_FUNCTION_GRAPH_TRACER)	+= ftrace.o

arch/parisc/kernel/entry.S

+27 −0
Original line number Original line Diff line number Diff line
@@ -2185,6 +2185,33 @@ syscall_do_resched: 
ENDPROC(syscall_exit)

ENDPROC(syscall_exit)









#ifdef CONFIG_FUNCTION_TRACER

	.import ftrace_function_trampoline,code

ENTRY(_mcount)

	copy	%r3, %arg2

	b	ftrace_function_trampoline

	nop

ENDPROC(_mcount)



ENTRY(return_to_handler)

	load32	return_trampoline, %rp

	copy	%ret0, %arg0

	copy	%ret1, %arg1

	b	ftrace_return_to_handler

	nop

return_trampoline:

	copy	%ret0, %rp

	copy	%r23, %ret0

	copy	%r24, %ret1



.globl ftrace_stub

ftrace_stub:

	bv	%r0(%rp)

	nop

ENDPROC(return_to_handler)

#endif	/* CONFIG_FUNCTION_TRACER */





get_register:

get_register:

	/*

	/*

	 * get_register is used by the non access tlb miss handlers to

	 * get_register is used by the non access tlb miss handlers to