arch/arm/config.mk

   1 # SPDX-License-Identifier: GPL-2.0+
   2 #
   3 # (C) Copyright 2000-2002
   4 # Wolfgang Denk, DENX Software Engineering, [email protected].
   5
   6 ifndef CONFIG_STANDALONE_LOAD_ADDR
   7 ifneq ($(CONFIG_ARCH_OMAP2PLUS),)
   8 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
   9 else
  10 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  11 endif
  12 endif
  13
  14 CFLAGS_NON_EFI := -fno-pic -ffixed-r9 -ffunction-sections -fdata-sections \
  15                   -fstack-protector-strong
  16 CFLAGS_EFI := -fpic -fshort-wchar
  17
  18 ifneq ($(CONFIG_LTO)$(CONFIG_USE_PRIVATE_LIBGCC),yy)
  19 LDFLAGS_FINAL += --gc-sections
  20 endif
  21
  22 ifndef CONFIG_LTO
  23 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
  24 endif
  25
  26 PLATFORM_RELFLAGS += -fno-common -ffixed-r9
  27 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
  28                      $(call cc-option,-mgeneral-regs-only) \
  29       $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
  30
  31 # LLVM support
  32 LLVM_RELFLAGS           := $(call cc-option,-mllvm,) \
  33                         $(call cc-option,-mno-movt,)
  34 PLATFORM_RELFLAGS       += $(LLVM_RELFLAGS)
  35
  36 PLATFORM_CPPFLAGS += -D__ARM__
  37
  38 ifdef CONFIG_ARM64
  39 PLATFORM_ELFFLAGS += -B aarch64 -O elf64-littleaarch64
  40 else
  41 PLATFORM_ELFFLAGS += -B arm -O elf32-littlearm
  42 endif
  43
  44 # Choose between ARM/Thumb instruction sets
  45 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
  46 AFLAGS_IMPLICIT_IT      := $(call as-option,-Wa$(comma)-mimplicit-it=always)
  47 PF_CPPFLAGS_ARM         := $(AFLAGS_IMPLICIT_IT) \
  48                         $(call cc-option, -mthumb -mthumb-interwork,\
  49                         $(call cc-option,-marm,)\
  50                         $(call cc-option,-mno-thumb-interwork,)\
  51                 )
  52 else
  53 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  54                 $(call cc-option,-mno-thumb-interwork,)
  55 endif
  56
  57 # Only test once
  58 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
  59 archprepare: checkthumb checkgcc6
  60
  61 checkthumb:
  62         @if test "$(call cc-name)" = "gcc" -a \
  63                         "$(call cc-version)" -lt "0404"; then \
  64                 echo -n '*** Your GCC does not produce working '; \
  65                 echo 'binaries in THUMB mode.'; \
  66                 echo '*** Your board is configured for THUMB mode.'; \
  67                 false; \
  68         fi
  69 else
  70 archprepare: checkgcc6
  71 endif
  72
  73 checkgcc6:
  74         @if test "$(call cc-name)" = "gcc" -a \
  75                         "$(call cc-version)" -lt "0600"; then \
  76                 echo '*** Your GCC is older than 6.0 and is not supported'; \
  77                 false; \
  78         fi
  79
  80
  81 # Try if EABI is supported, else fall back to old API,
  82 # i. e. for example:
  83 # - with ELDK 4.2 (EABI supported), use:
  84 #       -mabi=aapcs-linux
  85 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  86 #       -mabi=apcs-gnu
  87 # - with ELDK 3.1 (gcc 3.x), use:
  88 #       -mapcs-32
  89 PF_CPPFLAGS_ABI := $(call cc-option,\
  90                         -mabi=aapcs-linux,\
  91                         $(call cc-option,\
  92                                 -mapcs-32,\
  93                                 $(call cc-option,\
  94                                         -mabi=apcs-gnu,\
  95                                 )\
  96                         )\
  97                 )
  98 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  99
 100 # For EABI, make sure to provide raise()
 101 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
 102 # This file is parsed many times, so the string may get added multiple
 103 # times. Also, the prefix needs to be different based on whether
 104 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
 105 # before adding the correct one.
 106 PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
 107         $(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
 108 endif
 109
 110 # needed for relocation
 111 LDFLAGS_u-boot += -pie
 112
 113 #
 114 # FIXME: binutils versions < 2.22 have a bug in the assembler where
 115 # branches to weak symbols can be incorrectly optimized in thumb mode
 116 # to a short branch (b.n instruction) that won't reach when the symbol
 117 # gets preempted
 118 #
 119 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
 120 #
 121 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
 122 ifeq ($(GAS_BUG_12532),)
 123 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
 124         then echo y; else echo n; fi)
 125 endif
 126 ifeq ($(GAS_BUG_12532),y)
 127 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
 128 endif
 129 endif
 130
 131 ifneq ($(CONFIG_SPL_BUILD),y)
 132 # Check that only R_ARM_RELATIVE relocations are generated.
 133 INPUTS-y += checkarmreloc
 134 # The movt / movw can hardcode 16 bit parts of the addresses in the
 135 # instruction. Relocation is not supported for that case, so disable
 136 # such usage by requiring word relocations.
 137 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 138 PLATFORM_CPPFLAGS += $(call cc-option, -fno-pic)
 139 endif
 140
 141 # limit ourselves to the sections we want in the .bin.
 142 ifdef CONFIG_ARM64
 143 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .data \
 144                 -j __u_boot_list -j .rela.dyn -j .got -j .got.plt \
 145                 -j .binman_sym_table -j .text_rest
 146 else
 147 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \
 148                 -j .data -j .got -j .got.plt -j __u_boot_list -j .rel.dyn \
 149                 -j .binman_sym_table -j .text_rest
 150 endif
 151
 152 # if a dtb section exists we always have to include it
 153 # there are only two cases where it is generated
 154 # 1) OF_EMBEDED is turned on
 155 # 2) unit tests include device tree blobs
 156 OBJCOPYFLAGS += -j .dtb.init.rodata
 157
 158 ifdef CONFIG_EFI_LOADER
 159 OBJCOPYFLAGS += -j .efi_runtime -j .efi_runtime_rel
 160 endif
 161
 162 ifdef CONFIG_MACH_IMX
 163 ifneq ($(CONFIG_IMX_CONFIG),"")
 164 ifdef CONFIG_SPL
 165 ifndef CONFIG_SPL_BUILD
 166 INPUTS-y += SPL
 167 endif
 168 else
 169 ifeq ($(CONFIG_OF_SEPARATE),y)
 170 INPUTS-y += u-boot-dtb.imx
 171 else
 172 INPUTS-y += u-boot.imx
 173 endif
 174 endif
 175 ifneq ($(CONFIG_VF610),)
 176 INPUTS-y += u-boot.vyb
 177 endif
 178 endif
 179 endif
 180
 181 EFI_LDS := elf_arm_efi.lds
 182 EFI_CRT0 := crt0_arm_efi.o
 183 EFI_RELOC := reloc_arm_efi.o