117 lines
3.3 KiB
Makefile
117 lines
3.3 KiB
Makefile
#
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# (C) Copyright 2000-2002
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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CROSS_COMPILE ?= arm-linux-
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ifndef CONFIG_STANDALONE_LOAD_ADDR
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ifneq ($(CONFIG_OMAP_COMMON),)
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CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
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else
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CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
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endif
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endif
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LDFLAGS_FINAL += --gc-sections
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PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
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-fno-common -ffixed-r9 -msoft-float
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#
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# When we use a hardfp toolchain if there are both 'libgcc.a' (hardfp) and
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# 'arm-linux-gnueabi/libgcc.a' (softfp) we need to use the latter. We
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# cannot always build with a hardfp-only toolchain.
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#
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ARCH_PLATFORM_LIBGCC := $(shell \
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X=`$(CC) -print-file-name=arm-linux-gnueabi/libgcc.a`; \
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if [ -f $$X ]; then echo $$X ; \
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else $(CC) -print-file-name=libgcc.a ; \
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fi)
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# Support generic board on ARM
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__HAVE_ARCH_GENERIC_BOARD := y
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PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
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# Choose between ARM/Thumb instruction sets
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ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
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PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
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$(call cc-option,-marm,)\
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$(call cc-option,-mno-thumb-interwork,)\
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)
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else
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PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
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$(call cc-option,-mno-thumb-interwork,)
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endif
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# Only test once
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ifneq ($(CONFIG_SPL_BUILD),y)
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ALL-$(CONFIG_SYS_THUMB_BUILD) += checkthumb
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endif
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# Try if EABI is supported, else fall back to old API,
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# i. e. for example:
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# - with ELDK 4.2 (EABI supported), use:
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# -mabi=aapcs-linux
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# - with ELDK 4.1 (gcc 4.x, no EABI), use:
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# -mabi=apcs-gnu
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# - with ELDK 3.1 (gcc 3.x), use:
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# -mapcs-32
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PF_CPPFLAGS_ABI := $(call cc-option,\
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-mabi=aapcs-linux,\
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$(call cc-option,\
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-mapcs-32,\
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$(call cc-option,\
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-mabi=apcs-gnu,\
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)\
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)\
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)
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PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
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# For EABI, make sure to provide raise()
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ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
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# This file is parsed many times, so the string may get added multiple
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# times. Also, the prefix needs to be different based on whether
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# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
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# before adding the correct one.
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ifdef CONFIG_SPL_BUILD
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PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \
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$(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
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else
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PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \
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$(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
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endif
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endif
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# needed for relocation
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LDFLAGS_u-boot += -pie
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#
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# FIXME: binutils versions < 2.22 have a bug in the assembler where
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# branches to weak symbols can be incorrectly optimized in thumb mode
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# to a short branch (b.n instruction) that won't reach when the symbol
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# gets preempted
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#
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# http://sourceware.org/bugzilla/show_bug.cgi?id=12532
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#
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ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
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ifeq ($(GAS_BUG_12532),)
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export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
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then echo y; else echo n; fi)
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endif
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ifeq ($(GAS_BUG_12532),y)
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PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
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endif
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endif
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ifneq ($(CONFIG_SPL_BUILD),y)
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# Check that only R_ARM_RELATIVE relocations are generated.
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ALL-y += checkarmreloc
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# The movt / movw can hardcode 16 bit parts of the addresses in the
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# instruction. Relocation is not supported for that case, so disable
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# such usage by requiring word relocations.
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PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
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endif
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