x86: split ABI related files

Move the files that *know* about the calling convention in use by the
compiler. The routines exposed by the files moved to the i386_sysV_abi
directory follow the C calling convention specified by the
i386_sysV_abi which is the default for GCC. The upstream GCC has been
enhanced to support the iamcu_ABI that is optimized for processors
that implement the IA MCU instruction set. This new ABI provides code,
data and stack size improvements on IA MCU based systems.

This change is the first step in adding support for the IA MCU
optimized toolchains to Zephyr OS

Change-Id: I13bffee8007fb3f82aa31389b2c241065e8e315d
Original-work-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>

arch/x86/core/Makefile

@@ -10,13 +10,13 @@ else
 KBUILD_AFLAGS += -Wa,--divide
 endif
 
+obj-y = i386_sysV_abi/
 
-obj-y = gdt.o thread.o fatal.o cpuhalt.o \
-	excstub.o swap.o msr.o dynamic.o \
+obj-y += gdt.o fatal.o cpuhalt.o \
+	msr.o dynamic.o \
 	excconnect.o sys_fatal_error_handler.o \
 	crt0.o driver_static_irq_stubs.o \
-	atomic.o cache_s.o cache.o intconnect.o \
-	intstub.o
+	atomic.o cache_s.o cache.o
 
 obj-$(CONFIG_FP_SHARING) += float.o
 obj-$(CONFIG_MICROKERNEL) += strtask.o

arch/x86/core/i386_sysV_abi/Makefile

@@ -0,0 +1,11 @@
+ccflags-y += -I$(srctree)/kernel/nanokernel/include
+ccflags-y += -I$(srctree)/kernel/microkernel/include
+
+# see explanation for flags in arch/x86/core/Makefile
+ifeq ($(COMPILER),clang)
+KBUILD_AFLAGS += -no-integrated-as -Wa,--divide
+else
+KBUILD_AFLAGS += -Wa,--divide
+endif
+
+obj-y = excstub.o intconnect.o intstub.o swap.o thread.o

arch/x86/core/i386_sysV_abi/excstub.S

@@ -441,4 +441,3 @@ SECTION_FUNC(TEXT, _DynExcStubsNoErrBegin)
 
 #endif /* CONFIG_NUM_DYNAMIC_EXC_NOERR_STUBS */
 #endif /* ALL_DYN_EXC_STUBS */
-

arch/x86/core/i386_sysV_abi/swap.S

@@ -376,4 +376,3 @@ BRANCH_LABEL(skipIntLatencyStop)
 #endif
 	popfl
 	ret
-