1# SPDX-License-Identifier: GPL-2.0+ 2# 3# (C) Copyright 2000-2002 4# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 6ifeq ($(CONFIG_ARM64),y) 7FIXED_REG := -ffixed-x18 8else 9FIXED_REG := -ffixed-r9 10endif 11 12CFLAGS_NON_EFI := -fno-pic $(FIXED_REG) -ffunction-sections -fdata-sections \ 13 -fstack-protector-strong 14CFLAGS_EFI := -fpic -fshort-wchar 15 16ifneq ($(LTO_ENABLE)$(CONFIG_USE_PRIVATE_LIBGCC),yy) 17LDFLAGS_FINAL += --gc-sections 18endif 19 20ifneq ($(LTO_ENABLE),y) 21PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections 22endif 23 24PLATFORM_RELFLAGS += -fno-common $(FIXED_REG) 25PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \ 26 $(call cc-option,-mgeneral-regs-only) \ 27 $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) 28 29# LLVM support 30LLVM_RELFLAGS := $(call cc-option,-mllvm,) \ 31 $(call cc-option,-mno-movt,) 32PLATFORM_RELFLAGS += $(LLVM_RELFLAGS) 33 34PLATFORM_CPPFLAGS += -D__ARM__ 35 36ifdef CONFIG_ARM64 37PLATFORM_ELFFLAGS += -B aarch64 -O elf64-littleaarch64 38else 39PLATFORM_ELFFLAGS += -B arm -O elf32-littlearm 40endif 41 42# Choose between ARM/Thumb instruction sets 43ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y) 44AFLAGS_IMPLICIT_IT := $(call as-option,-Wa$(comma)-mimplicit-it=always) 45PF_CPPFLAGS_ARM := $(AFLAGS_IMPLICIT_IT) \ 46 $(call cc-option, -mthumb -mthumb-interwork,\ 47 $(call cc-option,-marm,)\ 48 $(call cc-option,-mno-thumb-interwork,)\ 49 ) 50else 51PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \ 52 $(call cc-option,-mno-thumb-interwork,) 53endif 54 55# Only test once 56ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y) 57archprepare: checkthumb checkgcc6 58 59checkthumb: 60 @if test "$(call cc-name)" = "gcc" -a \ 61 "$(call cc-version)" -lt "0404"; then \ 62 echo -n '*** Your GCC does not produce working '; \ 63 echo 'binaries in THUMB mode.'; \ 64 echo '*** Your board is configured for THUMB mode.'; \ 65 false; \ 66 fi 67else 68archprepare: checkgcc6 69endif 70 71checkgcc6: 72 @if test "$(call cc-name)" = "gcc" -a \ 73 "$(call cc-version)" -lt "0600"; then \ 74 echo '*** Your GCC is older than 6.0 and is not supported'; \ 75 false; \ 76 fi 77 78 79# Try if EABI is supported, else fall back to old API, 80# i. e. for example: 81# - with ELDK 4.2 (EABI supported), use: 82# -mabi=aapcs-linux 83# - with ELDK 4.1 (gcc 4.x, no EABI), use: 84# -mabi=apcs-gnu 85# - with ELDK 3.1 (gcc 3.x), use: 86# -mapcs-32 87PF_CPPFLAGS_ABI := $(call cc-option,\ 88 -mabi=aapcs-linux,\ 89 $(call cc-option,\ 90 -mapcs-32,\ 91 $(call cc-option,\ 92 -mabi=apcs-gnu,\ 93 )\ 94 )\ 95 ) 96PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI) 97 98# For EABI, make sure to provide raise() 99ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) 100# This file is parsed many times, so the string may get added multiple 101# times. Also, the prefix needs to be different based on whether 102# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry 103# before adding the correct one. 104PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \ 105 $(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 106endif 107 108# needed for relocation 109LDFLAGS_u-boot += -pie 110 111# 112# FIXME: binutils versions < 2.22 have a bug in the assembler where 113# branches to weak symbols can be incorrectly optimized in thumb mode 114# to a short branch (b.n instruction) that won't reach when the symbol 115# gets preempted 116# 117# http://sourceware.org/bugzilla/show_bug.cgi?id=12532 118# 119ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y) 120ifeq ($(GAS_BUG_12532),) 121export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \ 122 then echo y; else echo n; fi) 123endif 124ifeq ($(GAS_BUG_12532),y) 125PLATFORM_RELFLAGS += -fno-optimize-sibling-calls 126endif 127endif 128 129ifneq ($(CONFIG_SPL_BUILD),y) 130# Check that only R_ARM_RELATIVE relocations are generated. 131INPUTS-y += checkarmreloc 132# The movt / movw can hardcode 16 bit parts of the addresses in the 133# instruction. Relocation is not supported for that case, so disable 134# such usage by requiring word relocations. 135PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations) 136PLATFORM_CPPFLAGS += $(call cc-option, -fno-pic) 137endif 138 139# limit ourselves to the sections we want in the .bin. 140ifdef CONFIG_ARM64 141OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .data \ 142 -j __u_boot_list -j .rela.dyn -j .got -j .got.plt \ 143 -j .binman_sym_table -j .text_rest 144else 145OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \ 146 -j .data -j .got -j .got.plt -j __u_boot_list -j .rel.dyn \ 147 -j .binman_sym_table -j .text_rest 148endif 149 150# if a dtb section exists we always have to include it 151# there are only two cases where it is generated 152# 1) OF_EMBEDED is turned on 153# 2) unit tests include device tree blobs 154OBJCOPYFLAGS += -j .dtb.init.rodata 155 156ifdef CONFIG_EFI_LOADER 157OBJCOPYFLAGS += -j .efi_runtime -j .efi_runtime_rel 158endif 159 160ifdef CONFIG_MACH_IMX 161ifneq ($(CONFIG_IMX_CONFIG),"") 162ifdef CONFIG_SPL 163ifndef CONFIG_SPL_BUILD 164INPUTS-y += SPL 165endif 166else 167ifeq ($(CONFIG_OF_SEPARATE),y) 168INPUTS-y += u-boot-dtb.imx 169else 170INPUTS-y += u-boot.imx 171endif 172endif 173ifneq ($(CONFIG_VF610),) 174INPUTS-y += u-boot.vyb 175endif 176endif 177endif 178 179EFI_LDS := elf_arm_efi.lds 180EFI_CRT0 := crt0_arm_efi.o 181EFI_RELOC := reloc_arm_efi.o 182