2 files changed, 24 insertions, 2 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c4d585e2de7a..ead6172692db 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -401,6 +401,21 @@ config NO_IDLE_HZ
           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
           to have accurate timekeeping with dynamic tick.
 
+config AEABI
+        bool "Use the ARM EABI to compile the kernel"
+        help
+          This option allows for the kernel to be compiled using the latest
+          ARM ABI (aka EABI).  This is only useful if you are using a user
+          space environment that is also compiled with EABI.
+
+          Since there are major incompatibilities between the legacy ABI and
+          EABI, especially with regard to structure member alignment, this
+          option also changes the kernel syscall calling convention to
+          disambiguate both ABIs and allow for backward compatibility support
+          (selected with CONFIG_OABI_COMPAT).
+
+          To use this you need GCC version 4.0.0 or later.
+
 config ARCH_DISCONTIGMEM_ENABLE
         bool
         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
@@ -587,6 +602,7 @@ comment "At least one emulation must be selected"
 
 config FPE_NWFPE
         bool "NWFPE math emulation"
+        depends on !AEABI
         ---help---
           Say Y to include the NWFPE floating point emulator in the kernel.
           This is necessary to run most binaries. Linux does not currently
@@ -610,7 +626,7 @@ config FPE_NWFPE_XP
 
 config FPE_FASTFPE
         bool "FastFPE math emulation (EXPERIMENTAL)"
-        depends on !CPU_32v3 && EXPERIMENTAL
+        depends on !AEABI && !CPU_32v3 && EXPERIMENTAL
         ---help---
           Say Y here to include the FAST floating point emulator in the kernel.
           This is an experimental much faster emulator which now also has full
@@ -642,6 +658,7 @@ source "fs/Kconfig.binfmt"
 
 config ARTHUR
         tristate "RISC OS personality"
+        depends on !AEABI
         help
           Say Y here to include the kernel code necessary if you want to run
           Acorn RISC OS/Arthur binaries under Linux. This code is still very
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 1fa2a1011584..fbfc14a56b96 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -56,8 +56,13 @@ tune-$(CONFIG_CPU_SA1100)	:=-mtune=strongarm1100
 tune-$(CONFIG_CPU_XSCALE)       :=$(call cc-option,-mtune=xscale,-mtune=strongarm110) -Wa,-mcpu=xscale
 tune-$(CONFIG_CPU_V6)           :=$(call cc-option,-mtune=arm1136j-s,-mtune=strongarm)
 
-# Need -Uarm for gcc < 3.x
+ifeq ($(CONFIG_AEABI),y)
+CFLAGS_ABI      :=-mabi=aapcs -mno-thumb-interwork
+else
 CFLAGS_ABI      :=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,)
+endif
+
+# Need -Uarm for gcc < 3.x
 CFLAGS          +=$(CFLAGS_ABI) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
 AFLAGS          +=$(CFLAGS_ABI) $(arch-y) $(tune-y) -msoft-float