arch/arm: add support for armclang compiler(AC6)

Reference:
https://developer.arm.com/Tools%20and%20Software/Arm%20Compiler%20for%20Embedded

Signed-off-by: chao an <anchao@xiaomi.com>
Signed-off-by: sheyunhu <sheyunhu@xiaomi.com>

arch/arm/Kconfig

@@ -42,6 +42,10 @@ config ARM_TOOLCHAIN_CLANG
 	bool "Generic Clang toolchain"
 	select ARCH_TOOLCHAIN_CLANG
 
+config ARM_TOOLCHAIN_ARMCLANG
+	bool "ARM Compiler Clang toolchain"
+	select ARCH_TOOLCHAIN_CLANG
+
 endchoice
 
 choice

arch/arm/src/Makefile

@@ -85,37 +85,45 @@ UOBJS = $(UAOBJS) $(UCOBJS)
 KBIN = libkarch$(LIBEXT)
 BIN  = libarch$(LIBEXT)
 
-LDFLAGS += $(addprefix -T,$(call CONVERT_PATH,$(ARCHSCRIPT))) $(EXTRALINKCMDS)
-
 # Override in Make.defs if linker is not 'ld'
 
-ifeq ($(LD),$(CC))
+ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),)
-  LDSTARTGROUP ?= -Wl,--start-group
+  ifeq ($(LD),$(CC))
-  LDENDGROUP   ?= -Wl,--end-group
+    LDSTARTGROUP ?= -Wl,--start-group
-  LDFLAGS      := $(addprefix -Xlinker ,$(LDFLAGS))
+    LDENDGROUP   ?= -Wl,--end-group
-  LDFLAGS      += $(CFLAGS)
+    LDFLAGS      := $(addprefix -Xlinker ,$(LDFLAGS))
+    LDFLAGS      += $(CFLAGS)
+  else
+    LDSTARTGROUP ?= --start-group
+    LDENDGROUP   ?= --end-group
+  endif
+
+  LIBPATH_OPT = -L
+  SCRIPT_OPT  = -T
 else
-  LDSTARTGROUP ?= --start-group
+  LIBPATH_OPT = --userlibpath
-  LDENDGROUP   ?= --end-group
+  EXTRA_LIBS += arm_vectors.o
+  SCRIPT_OPT  = --scatter=
 endif
 
+LDFLAGS += $(addprefix $(SCRIPT_OPT),$(call CONVERT_PATH,$(ARCHSCRIPT))) $(EXTRALINKCMDS)
+LIBPATHS += $(LIBPATH_OPT) $(call CONVERT_PATH,$(TOPDIR)$(DELIM)staging)
+
 BOARDMAKE = $(if $(wildcard board$(DELIM)Makefile),y,)
-
-LIBPATHS += -L $(call CONVERT_PATH,$(TOPDIR)$(DELIM)staging)
 ifeq ($(BOARDMAKE),y)
-  LIBPATHS += -L $(call CONVERT_PATH,$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board)
+  LIBPATHS += $(LIBPATH_OPT) $(call CONVERT_PATH,$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board)
 endif
 
-LDLIBS = $(patsubst %.a,%,$(patsubst lib%,-l%,$(LINKLIBS)))
+LDLIBS = $(patsubst %.a,%,$(patsubst lib%,--library=%,$(LINKLIBS)))
 ifeq ($(BOARDMAKE),y)
-  LDLIBS += -lboard
+  LDLIBS += --library=board
 endif
 
 VPATH += chip
 VPATH += common
 VPATH += $(ARCH_SUBDIR)
 
-ifeq ($(CONFIG_ARCH_TOOLCHAIN_IAR),y)
+ifeq ($(CONFIG_ARM_TOOLCHAIN_IAR),y)
   VPATH += common$(DELIM)iar
 else # ifeq ($(CONFIG_ARCH_TOOLCHAIN_GNU),y)
   VPATH += common$(DELIM)gnu

arch/arm/src/armv6-m/Toolchain.defs

@@ -27,6 +27,8 @@ TOOLCHAIN_MFLOAT := -mfloat-abi=soft
 
 ifeq ($(CONFIG_ARM_TOOLCHAIN_CLANG),y)
   TOOLCHAIN_MARCH := --config armv6m_soft_nofp_nosys
+else ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+  LDFLAGS += --cpu=Cortex-M0
 endif
 
 include $(TOPDIR)/arch/arm/src/common/Toolchain.defs

arch/arm/src/armv7-a/Toolchain.defs

@@ -61,4 +61,26 @@ else
   ARCHCPUFLAGS += -mfloat-abi=soft
 endif
 
+ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+
+  ifeq ($(CONFIG_ARCH_CORTEXA5),y)
+    LDCPUFLAGS = Cortex-A5
+  else ifeq ($(CONFIG_ARCH_CORTEXA7),y)
+    LDCPUFLAGS = Cortex-A7
+  else ifeq ($(CONFIG_ARCH_CORTEXA8),y)
+    LDCPUFLAGS = Cortex-A8
+  else ifeq ($(CONFIG_ARCH_CORTEXA9),y)
+    LDCPUFLAGS = Cortex-A9
+  endif
+
+  ifeq ($(CONFIG_ARCH_FPU),)
+    LDFLAGS += --cpu=$(LDCPUFLAGS).no_neon.no_vfp
+  else ifeq ($(CONFIG_ARM_NEON),)
+    LDFLAGS += --cpu=$(LDCPUFLAGS).no_neon
+  else
+    LDFLAGS += --cpu=$(LDCPUFLAGS)
+  endif
+
+endif
+
 include $(TOPDIR)/arch/arm/src/common/Toolchain.defs

arch/arm/src/armv7-m/Toolchain.defs

@@ -75,6 +75,28 @@ ifeq ($(CONFIG_ARM_TOOLCHAIN_CLANG),y)
       TOOLCHAIN_MARCH += --config armv7m_soft_nofp_nosys
   endif
 
+else ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+
+  ifeq ($(CONFIG_ARCH_CORTEXM4),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      LDFLAGS += --cpu=Cortex-M4
+    else
+      LDFLAGS += --cpu=Cortex-M4.no_fp
+    endif
+  else ifeq ($(CONFIG_ARCH_CORTEXM7),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      ifeq ($(CONFIG_ARCH_DPFPU),y)
+        LDFLAGS += --cpu=Cortex-M7
+      else
+        LDFLAGS += --cpu=Cortex-M7.fp.sp
+      endif
+    else
+      LDFLAGS += --cpu=Cortex-M7.no_fp
+    endif
+  else # ifeq ($(CONFIG_ARCH_CORTEXM3),y)
+    LDFLAGS += --cpu=Cortex-M3
+  endif
+
 endif
 
 ifeq ($(CONFIG_ARMV7M_STACKCHECK),y)

arch/arm/src/armv7-r/Toolchain.defs

@@ -37,4 +37,24 @@ else
   ARCHCPUFLAGS += -mfloat-abi=soft
 endif
 
+ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+
+  ifeq ($(CONFIG_ARCH_CORTEXR4),y)
+    LDFLAGS += --cpu=Cortex-R4
+  else ifeq ($(CONFIG_ARCH_CORTEXR5),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      LDFLAGS += --cpu=Cortex-R5
+    else
+      LDFLAGS += --cpu=Cortex-R5.no_vfp
+    endif
+  else ifeq ($(CONFIG_ARCH_CORTEXR7),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      LDFLAGS += --cpu=Cortex-R7
+    else
+      LDFLAGS += --cpu=Cortex-R7.no_vfp
+    endif
+  endif
+
+endif
+
 include $(TOPDIR)/arch/arm/src/common/Toolchain.defs

arch/arm/src/armv8-m/Toolchain.defs

@@ -84,6 +84,38 @@ ifeq ($(CONFIG_ARM_TOOLCHAIN_CLANG),y)
     endif
   endif
 
+else ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+
+  ifeq ($(CONFIG_ARCH_CORTEXM23),y)
+    LDFLAGS += --cpu=Cortex-M23
+  else ifeq ($(CONFIG_ARCH_CORTEXM33),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      LDFLAGS += --cpu=Cortex-M33
+    else
+      LDFLAGS += --cpu=Cortex-M33.no_fp
+    endif
+  else ifeq ($(CONFIG_ARCH_CORTEXM35P),y)
+    ifeq ($(CONFIG_ARCH_FPU),y)
+      LDFLAGS += --cpu=Cortex-M35P
+    else
+      LDFLAGS += --cpu=Cortex-M35P.no_fp
+    endif
+  else ifeq ($(CONFIG_ARCH_CORTEXM55),y)
+    ifeq ($(CONFIG_ARM_HAVE_MVE),y)
+      ifeq ($(CONFIG_ARCH_FPU),y)
+        LDFLAGS += --cpu=Cortex-M55
+      else
+        LDFLAGS += --cpu=Cortex-M55.no_fp
+      endif
+    else
+      ifeq ($(CONFIG_ARCH_FPU),y)
+        LDFLAGS += --cpu=Cortex-M55.no_mve
+      else
+        LDFLAGS += --cpu=Cortex-M55.no_mve.no_fp
+      endif
+    endif
+  endif
+
 endif
 
 ifeq ($(CONFIG_ARMV8M_STACKCHECK),y)

arch/arm/src/common/Toolchain.defs

@@ -131,6 +131,32 @@ ifeq ($(CONFIG_ARM_TOOLCHAIN_CLANG),y)
 
   ARCHOPTIMIZATION += -fno-builtin
 
+# ARM Compiler Clang toolchain
+
+else ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+
+  CC      = armclang
+  CXX     = armclang
+  CPP     = armclang -E -P -x c
+  LD      = armlink
+  STRIP   = llvm-strip --strip-unneeded
+  AR      = armar -rcs
+  NM      = llvm-nm
+  OBJCOPY = llvm-objcopy
+  OBJDUMP = llvm-objdump
+
+  # Since the no_builtin attribute is not fully supported on Clang
+  # disable the built-in functions, refer:
+  # https://github.com/apache/incubator-nuttx/pull/5971
+
+  ARCHOPTIMIZATION += -fno-builtin
+  ARCHOPTIMIZATION += --target=arm-arm-none-eabi
+
+  # Suppress license warning
+
+  ARCHCPUFLAGS += -Wno-license-management
+  LDFLAGS      += --diag_suppress=9931
+
 # Default toolchain
 
 else
@@ -174,23 +200,35 @@ endif
 ARCHOPTIMIZATION += -fno-common -Wall -Wshadow -Wundef
 ARCHOPTIMIZATION += -nostdlib
 
-LDFLAGS += -nostdlib
+ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),)
+  LDFLAGS += -nostdlib
+endif
 
 # Optimization of unused sections
 
-ifeq ($(CONFIG_DEBUG_OPT_UNUSED_SECTIONS),y)
+ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),)
-  LDFLAGS          += --gc-sections
+  ifeq ($(CONFIG_DEBUG_OPT_UNUSED_SECTIONS),y)
-  ARCHOPTIMIZATION += -ffunction-sections -fdata-sections
+    LDFLAGS          += --gc-sections
+    ARCHOPTIMIZATION += -ffunction-sections -fdata-sections
+  endif
 endif
 
 # Debug link map
 
 ifeq ($(CONFIG_DEBUG_LINK_MAP),y)
-  LDFLAGS += --cref -Map=$(call CONVERT_PATH,$(TOPDIR)$(DELIM)nuttx.map)
+  ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),)
+    LDFLAGS += --cref -Map=$(call CONVERT_PATH,$(TOPDIR)$(DELIM)nuttx.map)
+  else
+    LDFLAGS += --strict --map --xref --symbols --info=unused --info=veneers
+    LDFLAGS += --info=summarysizes --info=summarystack
+  endif
 endif
 
 ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
   ARCHOPTIMIZATION += -g
+  ifeq ($(CONFIG_ARM_TOOLCHAIN_ARMCLANG),y)
+    LDFLAGS += --debug
+  endif
 endif
 
 # Add the builtin library