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Build support for 32-bit armv8-a

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Overwrite TARGET_(2ND_)ARCH_VARIANT as armv8-a if
TARGET_(2ND_)CPU_VARIANT is set to some known armv8-a core like
cortex-a53, cortex-a73, kryo, denver64 etc.

For clang, -march is ignored if -mcpu is set to specific core so this
change doen't impact the objects built for armv7-a-neon/some_armv8_core
since it's treated as armv8-a/some_armv8_core.

Bug: 62895439
Test: Built modified aosp_arm64 with armv8-a as its TARGET_2ND_CPU_ARCH
      and generic as its TARGET_2ND_CPU_VARIANT successfully.
      "lunch hikey-userdebug; make" and verify TARGET_2ND_ARCH_VARIANT
      is overwritten.

Change-Id: If4260cf397783b5f56c4fd432615f4676429a1d3
This commit is contained in:
Isaac Chen 2017-06-27 12:14:42 +08:00
parent 577ff4730f
commit 0daa78eef4
3 changed files with 35 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
core/combo/TARGET_linux-arm.mk
View file

@ -29,6 +29,26 @@
# include defines, and compiler settings for the given architecture
# version.
#
ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),)
TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT := generic
endif
KNOWN_ARMv8_CORES := cortex-a53 cortex-a53.a57 cortex-a73
KNOWN_ARMv8_CORES += kryo denver64 exynos-m1 exynos-m2
# Many devices (incorrectly) use armv7-a-neon as the 2nd architecture variant
# for cores that implement armv8-a ISAs. The following sets it to armv8-a.
ifneq (,$(filter $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT), $(KNOWN_ARMv8_CORES)))
ifneq ($(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT),armv8-a)
$(warning $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT) is armv8-a.)
ifneq (,$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT))
$(warning TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT, $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT), ignored! Use armv8-a instead.)
endif
# Overwrite TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT
TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv8-a
endif
endif
ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te
endif

9
core/combo/arch/arm/armv8-a.mk Normal file
View file

@ -0,0 +1,9 @@
# Configuration for Linux on ARM.
# Generating binaries for the ARMv8-a architecture
#
# Many libraries are not aware of armv8-a, and AArch32 is (almost) a superset
# of armv7-a-neon. So just let them think we are just like v7.
ARCH_ARM_HAVE_ARMV7A := true
ARCH_ARM_HAVE_VFP := true
ARCH_ARM_HAVE_VFP_D32 := true
ARCH_ARM_HAVE_NEON := true

12
target/board/generic_arm64/BoardConfig.mk
View file

@ -35,11 +35,11 @@ ifneq ($(TARGET_BUILD_APPS)$(filter cts,$(MAKECMDGOALS)),)
# platforms.
#
# If you're building a 64 bit platform (and not an application) the
# ARM-v8 specification allows you to assume NEON and all the features
# available in a cortex-A15 CPU. You should be able to set :
# ARM-v8 specification allows you to assume all the features available in an
# armv7-a-neon CPU. You should set the following as 2nd arch/cpu variant:
#
# TARGET_2ND_ARCH_VARIANT := armv7-a-neon
# TARGET_2ND_CPU_VARIANT := cortex-a15
# TARGET_2ND_ARCH_VARIANT := armv8-a
# TARGET_2ND_CPU_VARIANT := generic
#
# DO NOT USE
# DO NOT USE
@ -50,8 +50,8 @@ TARGET_2ND_CPU_VARIANT := generic
# DO NOT USE
# DO NOT USE
else
TARGET_2ND_ARCH_VARIANT := armv7-a-neon
TARGET_2ND_CPU_VARIANT := cortex-a15
TARGET_2ND_ARCH_VARIANT := armv8-a
TARGET_2ND_CPU_VARIANT := generic
endif