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