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 $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) 23 24# Support generic board on ARM 25__HAVE_ARCH_GENERIC_BOARD := y 26 27PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__ 28 29# Choose between ARM/Thumb instruction sets 30ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 31PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\ 32 $(call cc-option,-marm,)\ 33 $(call cc-option,-mno-thumb-interwork,)\ 34 ) 35else 36PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \ 37 $(call cc-option,-mno-thumb-interwork,) 38endif 39 40# Only test once 41ifneq ($(CONFIG_SPL_BUILD),y) 42ALL-$(CONFIG_SYS_THUMB_BUILD) += checkthumb 43endif 44 45# Try if EABI is supported, else fall back to old API, 46# i. e. for example: 47# - with ELDK 4.2 (EABI supported), use: 48# -mabi=aapcs-linux 49# - with ELDK 4.1 (gcc 4.x, no EABI), use: 50# -mabi=apcs-gnu 51# - with ELDK 3.1 (gcc 3.x), use: 52# -mapcs-32 53PF_CPPFLAGS_ABI := $(call cc-option,\ 54 -mabi=aapcs-linux,\ 55 $(call cc-option,\ 56 -mapcs-32,\ 57 $(call cc-option,\ 58 -mabi=apcs-gnu,\ 59 )\ 60 )\ 61 ) 62PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI) 63 64# For EABI, make sure to provide raise() 65ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) 66# This file is parsed many times, so the string may get added multiple 67# times. Also, the prefix needs to be different based on whether 68# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry 69# before adding the correct one. 70ifdef CONFIG_SPL_BUILD 71PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \ 72 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 73else 74PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \ 75 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 76endif 77endif 78 79# needed for relocation 80LDFLAGS_u-boot += -pie 81 82# 83# FIXME: binutils versions < 2.22 have a bug in the assembler where 84# branches to weak symbols can be incorrectly optimized in thumb mode 85# to a short branch (b.n instruction) that won't reach when the symbol 86# gets preempted 87# 88# http://sourceware.org/bugzilla/show_bug.cgi?id=12532 89# 90ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 91ifeq ($(GAS_BUG_12532),) 92export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \ 93 then echo y; else echo n; fi) 94endif 95ifeq ($(GAS_BUG_12532),y) 96PLATFORM_RELFLAGS += -fno-optimize-sibling-calls 97endif 98endif 99 100ifneq ($(CONFIG_SPL_BUILD),y) 101# Check that only R_ARM_RELATIVE relocations are generated. 102ALL-y += checkarmreloc 103# The movt / movw can hardcode 16 bit parts of the addresses in the 104# instruction. Relocation is not supported for that case, so disable 105# such usage by requiring word relocations. 106PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations) 107endif 108 109# limit ourselves to the sections we want in the .bin. 110ifdef CONFIG_ARM64 111OBJCFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn 112else 113OBJCFLAGS += -j .text -j .rodata -j .hash -j .data -j .got.plt -j .u_boot_list -j .rel.dyn 114endif 115