1# 2# (C) Copyright 2000-2002 3# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4# 5# SPDX-License-Identifier: GPL-2.0+ 6# 7 8CROSS_COMPILE ?= arm-linux- 9 10ifndef CONFIG_STANDALONE_LOAD_ADDR 11ifneq ($(CONFIG_OMAP_COMMON),) 12CONFIG_STANDALONE_LOAD_ADDR = 0x80300000 13else 14CONFIG_STANDALONE_LOAD_ADDR = 0xc100000 15endif 16endif 17 18LDFLAGS_FINAL += --gc-sections 19PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \ 20 -fno-common -ffixed-r9 21PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) 22 23# Support generic board on ARM 24__HAVE_ARCH_GENERIC_BOARD := y 25 26PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__ 27 28# Choose between ARM/Thumb instruction sets 29ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 30PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\ 31 $(call cc-option,-marm,)\ 32 $(call cc-option,-mno-thumb-interwork,)\ 33 ) 34else 35PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \ 36 $(call cc-option,-mno-thumb-interwork,) 37endif 38 39# Only test once 40ifneq ($(CONFIG_SPL_BUILD),y) 41ALL-$(CONFIG_SYS_THUMB_BUILD) += checkthumb 42endif 43 44# Try if EABI is supported, else fall back to old API, 45# i. e. for example: 46# - with ELDK 4.2 (EABI supported), use: 47# -mabi=aapcs-linux 48# - with ELDK 4.1 (gcc 4.x, no EABI), use: 49# -mabi=apcs-gnu 50# - with ELDK 3.1 (gcc 3.x), use: 51# -mapcs-32 52PF_CPPFLAGS_ABI := $(call cc-option,\ 53 -mabi=aapcs-linux,\ 54 $(call cc-option,\ 55 -mapcs-32,\ 56 $(call cc-option,\ 57 -mabi=apcs-gnu,\ 58 )\ 59 )\ 60 ) 61PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI) 62 63# For EABI, make sure to provide raise() 64ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) 65# This file is parsed many times, so the string may get added multiple 66# times. Also, the prefix needs to be different based on whether 67# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry 68# before adding the correct one. 69ifdef CONFIG_SPL_BUILD 70PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \ 71 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 72else 73PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \ 74 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 75endif 76endif 77 78# needed for relocation 79LDFLAGS_u-boot += -pie 80 81# 82# FIXME: binutils versions < 2.22 have a bug in the assembler where 83# branches to weak symbols can be incorrectly optimized in thumb mode 84# to a short branch (b.n instruction) that won't reach when the symbol 85# gets preempted 86# 87# http://sourceware.org/bugzilla/show_bug.cgi?id=12532 88# 89ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 90ifeq ($(GAS_BUG_12532),) 91export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \ 92 then echo y; else echo n; fi) 93endif 94ifeq ($(GAS_BUG_12532),y) 95PLATFORM_RELFLAGS += -fno-optimize-sibling-calls 96endif 97endif 98 99ifneq ($(CONFIG_SPL_BUILD),y) 100# Check that only R_ARM_RELATIVE relocations are generated. 101ALL-y += checkarmreloc 102# The movt / movw can hardcode 16 bit parts of the addresses in the 103# instruction. Relocation is not supported for that case, so disable 104# such usage by requiring word relocations. 105PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations) 106endif 107 108# limit ourselves to the sections we want in the .bin. 109ifdef CONFIG_ARM64 110OBJCFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn 111else 112OBJCFLAGS += -j .text -j .rodata -j .hash -j .data -j .got.plt -j .u_boot_list -j .rel.dyn 113endif 114