#	$NetBSD: Makefile.arm,v 1.51 2019/11/11 22:45:27 joerg Exp $

# Makefile for NetBSD
#
# This makefile is constructed from a machine description:
#	config machineid
# Most changes should be made in the machine description
#	/sys/arch/<arch>/conf/``machineid''
# after which you should do
#	config machineid
# Machine generic makefile changes should be made in
#	/sys/arch/arm/conf/Makefile.arm
# after which config should be rerun for all machines of that type.
#
# To specify debugging, add the config line: makeoptions DEBUG="-g"
# A better way is to specify -g only for a few files.
#
#	makeoptions DEBUGLIST="uvm* trap if_*"

USETOOLS?=	no
NEED_OWN_INSTALL_TARGET?=no
.include <bsd.own.mk>

##
## (1) port identification
##
THISARM=	$S/arch/${MACHINE}
ARM=		$S/arch/arm
GENASSYM_CONF=	${ARM}/arm32/genassym.cf
.-include "$S/arch/${MACHINE}/conf/Makefile.${MACHINE}.inc"

##
## (2) compile settings
##
# CPPFLAGS set by platform-specific Makefile fragment.
AFLAGS+=	-x assembler-with-cpp
COPTS.arm32_kvminit.c+=		-fno-stack-protector
COPTS.vfp_init.c=		-mfpu=vfp
CLANG_OBSOLETE_MULTI_ST=	${${ACTIVE_CC} == "clang":? -Wa,-W :}
AFLAGS.bcopyinout.S+=	-marm
AFLAGS.blockio.S+=	-marm ${CLANG_OBSOLETE_MULTI_ST}
AFLAGS.copystr.S+=	-marm
AFLAGS.cpufunc_asm.S+=	${CLANG_OBSOLETE_MULTI_ST}
AFLAGS.cpuswitch.S+=	-marm -mfpu=vfp
AFLAGS.exception.S+=	-marm ${CLANG_OBSOLETE_MULTI_ST}
AFLAGS.fiq_subr.S+=	${CLANG_OBSOLETE_MULTI_ST}
AFLAGS.fusu.S+=		-marm
AFLAGS.irq_dispatch.S+=	-marm ${CLANG_OBSOLETE_MULTI_ST}
AFLAGS.locore.S+=	-marm ${CLANG_OBSOLETE_MULTI_ST}
CFLAGS+=	 	-mfloat-abi=soft

# This files use instructions deprecated for ARMv7+, but still
# included in kernel that build with higher -mcpu=... settings.
CPPFLAGS.cpufunc_asm_armv4.S+=	-mcpu=arm8
CPPFLAGS.cpufunc_asm_armv6.S+=	-mcpu=arm1136j-s
CPPFLAGS.cpufunc_asm_arm11.S+=	-mcpu=arm1136j-s
CPPFLAGS.cpufunc_asm_xscale.S+=	-mcpu=xscale

.if !empty(MACHINE_ARCH:Mearmv6*) || !empty(MACHINE_ARCH:Mearmv7*)
# XXX
#
# Workaround for alignment faults on ARMv6+, at least occur with
# axe(4) and athn(4) drivers.
#
# For ARMv6+, unaligned access is enabled by default. However, it
# cannot be used for non-cacheable memory, which is used as DMA
# buffers. This results in alignment faults above. A real fix is
# to use cacheable memory as DMA buffers. However, it breaks some
# drivers, awge(4) and vchiq(4) at least.
#
# Until we figure out problems and fix them, we choose a fail-safe
# workaround here; forbid unaligned memory access for whole kernel.
# Affects on performance is negligibly small as far as we can see.
#
# See PR kern/54486 for more details.
CFLAGS+=	-mno-unaligned-access
.endif

##
## (3) libkern and compat
##
OPT_MODULAR=	%MODULAR%

##
## (4) local objects, compile rules, and dependencies
##
MD_OBJS+=	${SYSTEM_FIRST_OBJ} locore.o
MD_CFILES+=
MD_SFILES+=	${SYSTEM_FIRST_SFILE} ${ARM}/arm32/locore.S

.if defined(SYSTEM_FIRST_OBJ)
${SYSTEM_FIRST_OBJ}: ${SYSTEM_FIRST_SFILE} assym.h
	${NORMAL_S}
.endif

locore.o: ${ARM}/arm32/locore.S assym.h
	${NORMAL_S}

##
## (5) link settings
##
LOADADDRESS?=	0xF0000000
LINKFLAGS_NORMAL=	-X
# Strip ARM mapping symbols from the kernel image, as they interfere
# with ddb. Do it differently if 'makeoptions DEBUG="-g"' was specified.
.if !defined(DEBUG) || empty(DEBUG:M-g*)
SYSTEM_LD_TAIL?=	${OBJCOPY} --wildcard --strip-symbol='[$$][atd]' \
				    --strip-symbol='[$$][atd]\.*' $@;   \
			${SIZE} $@; chmod 755 $@
.else
STRIPFLAGS=-g --wildcard --strip-symbol='[$$][atd]' \
	   --strip-symbol='[$$][atd]\.*'
.endif

##
## (6) port specific target dependencies
##

# depend on CPU configuration
cpufunc.o cpufunc_asm.o: Makefile

# depend on DIAGNOSTIC etc.
cpuswitch.o fault.o machdep.o: Makefile

# various assembly files that depend on assym.h
atomic.o bcopy_page.o bcopyinout.o copystr.o cpuswitch.o cpu_in_cksum.o: assym.h
exception.o fiq_subr.o fusu.o irq_dispatch.o isa_irq.o sigcode.o: assym.h
spl.o vectors.o: assym.h

##
## (7) misc settings
##

##
## (8) config(8) generated machinery
##
%INCLUDES

%OBJS

%CFILES

%SFILES

%LOAD

%RULES

##
## (9) after the config file is inserted
##

.for f in ${SFILES:T:Mcpufunc_asm*}
AFLAGS.${f}+=-marm
.endfor

##
## (10) port independent kernel machinery
##

.include "$S/conf/Makefile.kern.inc"

##
## (11) Appending make options.
##
%MAKEOPTIONSAPPEND