diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2009-03-10 10:23:19 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-03-10 10:23:19 +0000 |
| commit | 99995b76f178db075212df2e8e231e6faccb7fff (patch) | |
| tree | 16ffdccd79956111c399362d2165ace8bbdeb627 | |
| parent | 4bf565da50598de52319016453c8a6706198b7ef (diff) | |
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: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | arch/arm/Kconfig.debug | 21 | ||||
| -rw-r--r-- | arch/arm/Makefile | 4 | ||||
| -rw-r--r-- | arch/arm/kernel/Makefile | 1 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 2 |
4 files changed, 22 insertions, 6 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index a7a01289a480..0a2d2be0152e 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -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" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index b9a1b34d8aa8..e3e5376166aa 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -87,6 +87,10 @@ 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) $(tune-y) -msoft-float diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index f1495d8ab15c..ad0d9f268032 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -29,6 +29,7 @@ obj-$(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 diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index b0f239e443bc..918648e16d99 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -394,7 +394,7 @@ 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 |