rules.h: Add ENV_ macros to detect current architecture

This patch expands the existing ENV_<stage> macros in <rules.h> with a
set of ENV_<arch> macros which can be used to detect which architecture
the current compilation unit is built for. These are more consistent
than compiler-defined macros (like '#ifdef __arm__') and will make it
easier to write small, architecture-dependent differences in common code
(where we currently often use IS_ENABLED(CONFIG_ARCH_...), which is
technically incorrect in a world where every stage can run on a
different architecture, and merely kinda happened to work out for now).

Also remove a vestigal <arch/rules.h> from ARM64 which was no longer
used, and genericise ARM subarchitecture Makefiles a little to make
things like __COREBOOT_ARM_ARCH__ available from all file types
(including .ld).

BUG=None
TEST=Compiled Falco, Blaze, Jerry and Smaug.

Change-Id: Id51aeb290b5c215c653e42a51919d0838e28621f
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/12433
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>

2 files changed, 26 insertions, 34 deletions

diff --git a/src/arch/arm/armv4/Makefile.inc b/src/arch/arm/armv4/Makefile.inc
index ee1879cf8f..1b91961f7e 100644
--- a/src/arch/arm/armv4/Makefile.inc
+++ b/src/arch/arm/armv4/Makefile.inc
@@ -30,8 +30,7 @@ endif
 
 bootblock-y += cache.c
 
-bootblock-c-ccopts += $(armv4_flags)
-bootblock-S-ccopts += $(armv4_flags)
+bootblock-generic-ccopts += $(armv4_flags)
 
 endif # CONFIG_ARCH_BOOTBLOCK_ARMV4
 
@@ -40,10 +39,8 @@ endif # CONFIG_ARCH_BOOTBLOCK_ARMV4
 ################################################################################
 
 ifeq ($(CONFIG_ARCH_VERSTAGE_ARMV4),y)
-libverstage-c-ccopts += $(armv4_flags)
-libverstage-S-ccopts += $(armv4_flags)
-verstage-c-ccopts += $(armv4_flags)
-verstage-S-ccopts += $(armv4_flags)
+libverstage-generic-ccopts += $(armv4_flags)
+verstage-generic-ccopts += $(armv4_flags)
 
 verstage-y += cache.c
 endif # CONFIG_ARCH_VERSTAGE_ARMV4
@@ -55,12 +52,10 @@ endif # CONFIG_ARCH_VERSTAGE_ARMV4
 ifeq ($(CONFIG_ARCH_ROMSTAGE_ARMV4),y)
 
 
-romstage-c-ccopts += $(armv4_flags)
-romstage-S-ccopts += $(armv4_flags)
+romstage-generic-ccopts += $(armv4_flags)
 romstage-y += cache.c
 
-rmodules_arm-c-ccopts += $(armv4_flags)
-rmodules_arm-S-ccopts += $(armv4_flags)
+rmodules_arm-generic-ccopts += $(armv4_flags)
 
 endif # CONFIG_ARCH_ROMSTAGE_ARMV4
 
@@ -70,7 +65,6 @@ endif # CONFIG_ARCH_ROMSTAGE_ARMV4
 
 ifeq ($(CONFIG_ARCH_RAMSTAGE_ARMV4),y)
 
-ramstage-c-ccopts += $(armv4_flags)
-ramstage-S-ccopts += $(armv4_flags)
+ramstage-generic-ccopts += $(armv4_flags)
 
 endif # CONFIG_ARCH_RAMSTAGE_ARMV4
diff --git a/src/arch/arm/armv7/Makefile.inc b/src/arch/arm/armv7/Makefile.inc
index 3a489cb259..2e9c49cbe2 100644
--- a/src/arch/arm/armv7/Makefile.inc
+++ b/src/arch/arm/armv7/Makefile.inc
@@ -20,16 +20,14 @@ armv7-a_flags = -march=armv7-a $(armv7_flags)
 armv7-m_flags = -march=armv7-m $(armv7_flags)
 
 armv7_asm_flags = -Wa,-mthumb -Wa,-mimplicit-it=always -Wa,-mno-warn-deprecated
-armv7-a_asm_flags = $(armv7-a_flags) $(armv7_asm_flags)
-armv7-m_asm_flags = $(armv7-m_flags) $(armv7_asm_flags)
 
 ###############################################################################
 # bootblock
 ###############################################################################
 
 ifeq ($(CONFIG_ARCH_BOOTBLOCK_ARMV7),y)
-bootblock-c-ccopts += $(armv7-a_flags)
-bootblock-S-ccopts += $(armv7-a_asm_flags)
+bootblock-generic-ccopts += $(armv7-a_flags)
+bootblock-S-ccopts += $(armv7_asm_flags)
 
 ifneq ($(CONFIG_BOOTBLOCK_CUSTOM),y)
 bootblock-y += bootblock.S
@@ -42,8 +40,8 @@ bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += exception_asm.S
 bootblock-y += mmu.c
 
 else ifeq ($(CONFIG_ARCH_BOOTBLOCK_ARMV7_M),y)
-bootblock-c-ccopts += $(armv7-m_flags)
-bootblock-S-ccopts += $(armv7-m_asm_flags)
+bootblock-generic-ccopts += $(armv7-m_flags)
+bootblock-S-ccopts += $(armv7_asm_flags)
 
 ifneq ($(CONFIG_BOOTBLOCK_CUSTOM),y)
 bootblock-y += bootblock_m.S
@@ -58,10 +56,10 @@ endif # CONFIG_ARCH_BOOTBLOCK_ARMV7
 ################################################################################
 
 ifeq ($(CONFIG_ARCH_VERSTAGE_ARMV7),y)
-libverstage-c-ccopts += $(armv7-a_flags)
-libverstage-S-ccopts += $(armv7-a_asm_flags)
-verstage-c-ccopts += $(armv7-a_flags)
-verstage-S-ccopts += $(armv7-a_asm_flags)
+libverstage-generic-ccopts += $(armv7-a_flags)
+libverstage-S-ccopts += $(armv7_asm_flags)
+verstage-generic-ccopts += $(armv7-a_flags)
+verstage-S-ccopts += $(armv7_asm_flags)
 
 verstage-y += cache.c
 verstage-y += cpu.S
@@ -70,10 +68,10 @@ verstage-y += exception_asm.S
 verstage-y += mmu.c
 
 else ifeq ($(CONFIG_ARCH_VERSTAGE_ARMV7_M),y)
-libverstage-c-ccopts += $(armv7-m_flags)
-libverstage-S-ccopts += $(armv7-m_asm_flags)
-verstage-c-ccopts += $(armv7-m_flags)
-verstage-S-ccopts += $(armv7-m_asm_flags)
+libverstage-generic-ccopts += $(armv7-m_flags)
+libverstage-S-ccopts += $(armv7_asm_flags)
+verstage-generic-ccopts += $(armv7-m_flags)
+verstage-S-ccopts += $(armv7_asm_flags)
 
 endif # CONFIG_ARCH_VERSTAGE_ARMV7_M
 
@@ -87,11 +85,11 @@ romstage-y += exception.c
 romstage-y += exception_asm.S
 romstage-y += mmu.c
 
-romstage-c-ccopts += $(armv7-a_flags)
-romstage-S-ccopts += $(armv7-a_asm_flags)
+romstage-generic-ccopts += $(armv7-a_flags)
+romstage-S-ccopts += $(armv7_asm_flags)
 
-rmodules_arm-c-ccopts += $(armv7-a_flags)
-rmodules_arm-S-ccopts += $(armv7-a_asm_flags)
+rmodules_arm-generic-ccopts += $(armv7-a_flags)
+rmodules_arm-S-ccopts += $(armv7_asm_flags)
 
 endif # CONFIG_ARCH_ROMSTAGE_ARMV7
 
@@ -107,10 +105,10 @@ ramstage-y += exception.c
 ramstage-y += exception_asm.S
 ramstage-y += mmu.c
 
-ramstage-c-ccopts += $(armv7-a_flags)
-ramstage-S-ccopts += $(armv7-a_asm_flags)
+ramstage-generic-ccopts += $(armv7-a_flags)
+ramstage-S-ccopts += $(armv7_asm_flags)
 
 # All rmodule code is armv7 if ramstage is armv7.
-rmodules_arm-c-ccopts += $(armv7-a_flags)
-rmodules_arm-S-ccopts += $(armv7-a_asm_flags)
+rmodules_arm-generic-ccopts += $(armv7-a_flags)
+rmodules_arm-S-ccopts += $(armv7_asm_flags)
 endif # CONFIG_ARCH_RAMSTAGE_ARMV7