compiler-rt: support a new embedded linux target

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>

Author: kraj

compiler-rt/make/platform/clang_linux_embedded.mk

@@ -0,0 +1,286 @@
+# These are the functions which clang needs when it is targeting a previous
+# version of the OS. The issue is that the backend may use functions which were
+# not present in the libgcc that shipped on the platform. In such cases, we link
+# with a version of the library which contains private_extern definitions of all
+# the extra functions which might be referenced.
+
+Description := Static runtime libraries for embedded clang/Linux
+
+# A function that ensures we don't try to build for architectures that we
+# don't have working toolchains for.
+CheckArches = \
+  $(shell \
+    result=""; \
+    for arch in $(1); do \
+      if $(CC) -arch $$arch -c \
+	  -integrated-as \
+	  $(ProjSrcRoot)/make/platform/clang_linux_embedded_test_input.c \
+	  -o /dev/null > /dev/null 2> /dev/null; then \
+        result="$$result$$arch "; \
+      else \
+	printf 1>&2 \
+	  "warning: clang_linux_embedded.mk: dropping arch '$$arch' from lib '$(2)'\n"; \
+      fi; \
+    done; \
+    echo $$result)
+
+XCRun = \
+  $(shell \
+    result=`xcrun -find $(1) 2> /dev/null`; \
+    if [ "$$?" != "0" ]; then result=$(1); fi; \
+    echo $$result)
+
+###
+
+CC       := $(call XCRun,clang)
+AR       := $(call XCRun,ar)
+RANLIB   := $(call XCRun,ranlib)
+STRIP    := $(call XCRun,strip)
+LIPO     := $(call XCRun,lipo)
+DSYMUTIL := $(call XCRun,dsymutil)
+Configs :=
+UniversalArchs :=
+
+# Soft-float version of the runtime. No floating-point instructions will be used
+# and the ABI (out of necessity) passes floating values in normal registers:
+# non-VFP variant of the AAPCS.
+UniversalArchs.soft_static := $(call CheckArches,arm armv7m armv7em armv7,soft_static)
+Configs += $(if $(UniversalArchs.soft_static),soft_static)
+
+# Hard-float version of the runtime. On ARM VFP instructions and registers are
+# allowed, and floating point values get passed in them. VFP variant of the
+# AAPCS.
+UniversalArchs.hard_static := $(call CheckArches,armv7em armv7 i386 x86_64,hard_static)
+Configs += $(if $(UniversalArchs.hard_static),hard_static)
+
+UniversalArchs.soft_pic := $(call CheckArches,armv6m armv7m armv7em armv7,soft_pic)
+Configs += $(if $(UniversalArchs.soft_pic),soft_pic)
+
+UniversalArchs.hard_pic := $(call CheckArches,armv7em armv7 i386 x86_64,hard_pic)
+Configs += $(if $(UniversalArchs.hard_pic),hard_pic)
+
+CFLAGS := -Wall -Werror -Oz -fomit-frame-pointer -ffreestanding
+
+PIC_CFLAGS := -fPIC
+STATIC_CFLAGS := -static
+
+CFLAGS_SOFT := -mfloat-abi=soft
+CFLAGS_HARD := -mfloat-abi=hard
+
+CFLAGS_I386  := -march=pentium
+
+CFLAGS.soft_static := $(CFLAGS) $(STATIC_CFLAGS) $(CFLAGS_SOFT)
+CFLAGS.hard_static := $(CFLAGS) $(STATIC_CFLAGS) $(CFLAGS_HARD)
+CFLAGS.soft_pic    := $(CFLAGS) $(PIC_CFLAGS) $(CFLAGS_SOFT)
+CFLAGS.hard_pic    := $(CFLAGS) $(PIC_CFLAGS) $(CFLAGS_HARD)
+
+CFLAGS.soft_static.armv7 := $(CFLAGS.soft_static) $(CFLAGS_ARMV7)
+CFLAGS.hard_static.armv7 := $(CFLAGS.hard_static) $(CFLAGS_ARMV7)
+CFLAGS.soft_pic.armv7    := $(CFLAGS.soft_pic) $(CFLAGS_ARMV7)
+CFLAGS.hard_pic.armv7    := $(CFLAGS.hard_pic) $(CFLAGS_ARMV7)
+
+# x86 platforms ignore -mfloat-abi options and complain about doing so. Despite
+# this they're hard-float.
+CFLAGS.hard_static.i386   := $(CFLAGS) $(STATIC_CFLAGS) $(CFLAGS_I386)
+CFLAGS.hard_pic.i386      := $(CFLAGS) $(PIC_CFLAGS) $(CFLAGS_I386)
+CFLAGS.hard_static.x86_64 := $(CFLAGS) $(STATIC_CFLAGS)
+CFLAGS.hard_pic.x86_64    := $(CFLAGS) $(PIC_CFLAGS)
+
+# Functions not wanted:
+#   + eprintf is obsolete anyway
+#   + *vfp: designed for Thumb1 CPUs with VFPv2
+
+COMMON_FUNCTIONS := \
+	absvdi2 \
+	absvsi2 \
+	addvdi3 \
+	addvsi3 \
+	ashldi3 \
+	ashrdi3 \
+	bswapdi2 \
+	bswapsi2 \
+	clzdi2 \
+	clzsi2 \
+	cmpdi2 \
+	ctzdi2 \
+	ctzsi2 \
+	divdc3 \
+	divdi3 \
+	divsc3 \
+	divmodsi4 \
+	udivmodsi4 \
+	do_global_dtors \
+	ffsdi2 \
+	fixdfdi \
+	fixsfdi \
+	fixunsdfdi \
+	fixunsdfsi \
+	fixunssfdi \
+	fixunssfsi \
+	floatdidf \
+	floatdisf \
+	floatundidf \
+	floatundisf \
+	gcc_bcmp \
+	lshrdi3 \
+	moddi3 \
+	muldc3 \
+	muldi3 \
+	mulsc3 \
+	mulvdi3 \
+	mulvsi3 \
+	negdi2 \
+	negvdi2 \
+	negvsi2 \
+	paritydi2 \
+	paritysi2 \
+	popcountdi2 \
+	popcountsi2 \
+	powidf2 \
+	powisf2 \
+	subvdi3 \
+	subvsi3 \
+	ucmpdi2 \
+	udiv_w_sdiv \
+	udivdi3 \
+	udivmoddi4 \
+	umoddi3 \
+	adddf3 \
+	addsf3 \
+	cmpdf2 \
+	cmpsf2 \
+	div0 \
+	divdf3 \
+	divsf3 \
+	divsi3 \
+	extendsfdf2 \
+	ffssi2 \
+	fixdfsi \
+	fixsfsi \
+	floatsidf \
+	floatsisf \
+	floatunsidf \
+	floatunsisf \
+	comparedf2 \
+	comparesf2 \
+	modsi3 \
+	muldf3 \
+	mulsf3 \
+	negdf2 \
+	negsf2 \
+	subdf3 \
+	subsf3 \
+	truncdfsf2 \
+	udivsi3 \
+	umodsi3 \
+	unorddf2 \
+	unordsf2
+
+ARM_FUNCTIONS := \
+	aeabi_cdcmpeq \
+	aeabi_cdrcmple \
+	aeabi_cfcmpeq \
+	aeabi_cfrcmple \
+	aeabi_dcmpeq \
+	aeabi_dcmpge \
+	aeabi_dcmpgt \
+	aeabi_dcmple \
+	aeabi_dcmplt \
+	aeabi_drsub \
+	aeabi_fcmpeq \
+	aeabi_fcmpge \
+	aeabi_fcmpgt \
+	aeabi_fcmple \
+	aeabi_fcmplt \
+	aeabi_frsub \
+	aeabi_idivmod \
+	aeabi_uidivmod \
+
+# ARM Assembly implementation which requires Thumb2 (i.e. won't work on v6M).
+THUMB2_FUNCTIONS := \
+	switch16 \
+	switch32 \
+	switch8 \
+	switchu8 \
+	sync_fetch_and_add_4 \
+	sync_fetch_and_sub_4 \
+	sync_fetch_and_and_4 \
+	sync_fetch_and_or_4 \
+	sync_fetch_and_xor_4 \
+	sync_fetch_and_nand_4 \
+	sync_fetch_and_max_4 \
+	sync_fetch_and_umax_4 \
+	sync_fetch_and_min_4 \
+	sync_fetch_and_umin_4 \
+	sync_fetch_and_add_8 \
+	sync_fetch_and_sub_8 \
+	sync_fetch_and_and_8 \
+	sync_fetch_and_or_8 \
+	sync_fetch_and_xor_8 \
+	sync_fetch_and_nand_8 \
+	sync_fetch_and_max_8 \
+	sync_fetch_and_umax_8 \
+	sync_fetch_and_min_8 \
+	sync_fetch_and_umin_8
+
+I386_FUNCTIONS :=  \
+	i686.get_pc_thunk.eax \
+	i686.get_pc_thunk.ebp \
+	i686.get_pc_thunk.ebx \
+	i686.get_pc_thunk.ecx \
+	i686.get_pc_thunk.edi \
+	i686.get_pc_thunk.edx \
+	i686.get_pc_thunk.esi
+
+# FIXME: Currently, compiler-rt is missing implementations for a number of the
+# functions. Filter them out for now.
+MISSING_FUNCTIONS := \
+	cmpdf2 cmpsf2 div0 \
+	ffssi2 \
+	udiv_w_sdiv unorddf2 unordsf2 bswapdi2 \
+	bswapsi2 \
+	gcc_bcmp \
+	do_global_dtors \
+	i686.get_pc_thunk.eax i686.get_pc_thunk.ebp i686.get_pc_thunk.ebx \
+	i686.get_pc_thunk.ecx i686.get_pc_thunk.edi i686.get_pc_thunk.edx \
+	i686.get_pc_thunk.esi \
+	aeabi_cdcmpeq aeabi_cdrcmple aeabi_cfcmpeq aeabi_cfrcmple aeabi_dcmpeq \
+	aeabi_dcmpge aeabi_dcmpgt aeabi_dcmple aeabi_dcmplt aeabi_drsub \
+	aeabi_fcmpeq \ aeabi_fcmpge aeabi_fcmpgt aeabi_fcmple aeabi_fcmplt \
+	aeabi_frsub aeabi_idivmod aeabi_uidivmod
+
+FUNCTIONS_ARMV6M  := $(COMMON_FUNCTIONS) $(ARM_FUNCTIONS)
+FUNCTIONS_ARM_ALL := $(COMMON_FUNCTIONS) $(ARM_FUNCTIONS) $(THUMB2_FUNCTIONS)
+FUNCTIONS_I386    := $(COMMON_FUNCTIONS) $(I386_FUNCTIONS)
+FUNCTIONS_X86_64  := $(COMMON_FUNCTIONS)
+
+FUNCTIONS_ARMV6M := \
+	$(filter-out $(MISSING_FUNCTIONS),$(FUNCTIONS_ARMV6M))
+FUNCTIONS_ARM_ALL := \
+	$(filter-out $(MISSING_FUNCTIONS),$(FUNCTIONS_ARM_ALL))
+FUNCTIONS_I386 := \
+	$(filter-out $(MISSING_FUNCTIONS),$(FUNCTIONS_I386))
+FUNCTIONS_X86_64 := \
+	$(filter-out $(MISSING_FUNCTIONS),$(FUNCTIONS_X86_64))
+
+FUNCTIONS.soft_static.armv6m := $(FUNCTIONS_ARMV6M)
+FUNCTIONS.soft_pic.armv6m    := $(FUNCTIONS_ARMV6M)
+
+FUNCTIONS.soft_static.armv7m := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.soft_pic.armv7m    := $(FUNCTIONS_ARM_ALL)
+
+FUNCTIONS.soft_static.armv7em := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.hard_static.armv7em := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.soft_pic.armv7em    := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.hard_pic.armv7em    := $(FUNCTIONS_ARM_ALL)
+
+FUNCTIONS.soft_static.armv7 := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.hard_static.armv7 := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.soft_pic.armv7    := $(FUNCTIONS_ARM_ALL)
+FUNCTIONS.hard_pic.armv7    := $(FUNCTIONS_ARM_ALL)
+
+FUNCTIONS.hard_static.i386 := $(FUNCTIONS_I386)
+FUNCTIONS.hard_pic.i386    := $(FUNCTIONS_I386)
+
+FUNCTIONS.hard_static.x86_64 := $(FUNCTIONS_X86_64)
+FUNCTIONS.hard_pic.x86_64    := $(FUNCTIONS_X86_64)