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 \
+obj-y += gdt.o fatal.o cpuhalt.o \
-	excstub.o swap.o msr.o dynamic.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 \
+	atomic.o cache_s.o cache.o
-	intstub.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/intstub.S

@@ -22,7 +22,7 @@ This module implements assembly routines to manage interrupts on
 the Intel IA-32 architecture.  More specifically, the interrupt (asynchronous
 exception) stubs are implemented in this module.  The stubs are invoked when
 entering and exiting a C interrupt handler.
- */
+*/
 
 #define _ASMLANGUAGE
 
@@ -41,7 +41,7 @@ entering and exiting a C interrupt handler.
 	GTEXT(_SpuriousIntHandler)
 	GTEXT(_DynIntStubsBegin)
 
- 	/* externs */
+	/* externs */
 
 	GTEXT(_Swap)
 
@@ -271,7 +271,7 @@ SECTION_FUNC(TEXT, _IntExit)
 	 * debug tools that a preemptive context switch has occurred.
 	 *
 	 * Setting the NO_METRICS bit tells _Swap() that the per-execution context
-         * [totalRunTime] calculation has already been performed and that
+	 * [totalRunTime] calculation has already been performed and that
 	 * there is no need to do it again.
 	 */
 
@@ -290,7 +290,7 @@ SECTION_FUNC(TEXT, _IntExit)
 	popl	%esp		/* switch back to kernel stack */
 
 	pushfl			/* push KERNEL_LOCK_KEY argument */
- 	call	_Swap
+	call	_Swap
 
 	/*
 	 * The interrupted thread has now been scheduled,

arch/x86/core/i386_sysV_abi/swap.S

@@ -146,7 +146,7 @@ SECTION_FUNC(TEXT, _Swap)
 	jmp 	restoreContext
 
 
- 	/*
+	/*
 	 * There are no fiber in the run queue, thus swap in the task
 	 * (_nanokernel.task).  The 'task' field will _never_ be NULL.
 	 */
@@ -376,4 +376,3 @@ BRANCH_LABEL(skipIntLatencyStop)
 #endif
 	popfl
 	ret
-