[ARM] 3107/3: ARM EABI: last bits to configure it

Patch from Nicolas Pitre

This adds the configuration option, and disables any FPA floating point
emulators which are not EABI compatible.

It also disables Acorn RISC OS/Arthur binary support when CONFIG_EABI=y
since it is incompatible with an EABI kernel.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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