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Commit adf8b37b authored by Catalin Marinas's avatar Catalin Marinas Committed by Russell King
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[ARM] 5386/2: unwind: Add Makefile and Kconfig entries for ARM stack unwinding 



This patch also makes the frame pointer default to y only if
!ARM_UNWIND. LOCKDEP no longer selects FRAME_POINTER if ARM_UNWIND is
enabled.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent c4c5716e

arch/arm/Kconfig.debug

+16 −5
Original line number Diff line number Diff line
@@ -2,18 +2,29 @@ menu "Kernel hacking" 


source "lib/Kconfig.debug"



# RMK wants arm kernels compiled with frame pointers so hardwire this to y.

# RMK wants arm kernels compiled with frame pointers or stack unwinding.

# If you know what you are doing and are willing to live without stack

# traces, you can get a slightly smaller kernel by setting this option to

# n, but then RMK will have to kill you ;).

config FRAME_POINTER

	bool

	default y

	default y if !ARM_UNWIND

	help

	  If you say N here, the resulting kernel will be slightly smaller and

	  faster. However, when a problem occurs with the kernel, the

	  information that is reported is severely limited. Most people

	  should say Y here.

	  faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,

	  when a problem occurs with the kernel, the information that is

	  reported is severely limited.



config ARM_UNWIND

	bool "Enable stack unwinding support"

	depends on AEABI && EXPERIMENTAL

	default y

	help

	  This option enables stack unwinding support in the kernel

	  using the information automatically generated by the

	  compiler. The resulting kernel image is slightly bigger but

	  the performance is not affected. Currently, this feature

	  only works with EABI compilers. If unsure say Y.



config DEBUG_USER

	bool "Verbose user fault messages"

arch/arm/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -85,6 +85,10 @@ else 
CFLAGS_ABI	:=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,)

endif



ifeq ($(CONFIG_ARM_UNWIND),y)

CFLAGS_ABI	+=-funwind-tables

endif



# Need -Uarm for gcc < 3.x

KBUILD_CFLAGS	+=$(CFLAGS_ABI) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm

KBUILD_AFLAGS	+=$(CFLAGS_ABI) $(arch-y) $(tune-y) -msoft-float

arch/arm/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ obj-$(CONFIG_ATAGS_PROC) += atags.o 
obj-$(CONFIG_OABI_COMPAT)	+= sys_oabi-compat.o

obj-$(CONFIG_ARM_THUMBEE)	+= thumbee.o

obj-$(CONFIG_KGDB)		+= kgdb.o

obj-$(CONFIG_ARM_UNWIND)	+= unwind.o



obj-$(CONFIG_CRUNCH)		+= crunch.o crunch-bits.o

AFLAGS_crunch-bits.o		:= -Wa,-mcpu=ep9312

lib/Kconfig.debug

+1 −1
Original line number Diff line number Diff line
@@ -402,7 +402,7 @@ config LOCKDEP 
	bool

	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT

	select STACKTRACE

	select FRAME_POINTER if !X86 && !MIPS && !PPC

	select FRAME_POINTER if !X86 && !MIPS && !PPC && !ARM_UNWIND

	select KALLSYMS

	select KALLSYMS_ALL