arch/arm/config.mk

   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
   8 ifndef CONFIG_STANDALONE_LOAD_ADDR
   9 ifneq ($(CONFIG_ARCH_OMAP2PLUS),)
  10 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
  11 else
  12 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  13 endif
  14 endif
  15
  16 CFLAGS_NON_EFI := -fno-pic -ffixed-r9 -ffunction-sections -fdata-sections
  17 CFLAGS_EFI := -fpic -fshort-wchar
  18
  19 LDFLAGS_FINAL += --gc-sections
  20 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
  21                      -fno-common -ffixed-r9
  22 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
  23       $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
  24
  25 # LLVM support
  26 LLVMS_RELFLAGS          := $(call cc-option,-mllvm,) \
  27                         $(call cc-option,-target arm-none-eabi,) \
  28                         $(call cc-option,-arm-use-movt=0,)
  29 PLATFORM_RELFLAGS       += $(LLVM_RELFLAGS)
  30
  31 PLATFORM_CPPFLAGS += -D__ARM__
  32
  33 ifdef CONFIG_ARM64
  34 PLATFORM_ELFFLAGS += -B aarch64 -O elf64-littleaarch64
  35 else
  36 PLATFORM_ELFFLAGS += -B arm -O elf32-littlearm
  37 endif
  38
  39 # Choose between ARM/Thumb instruction sets
  40 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
  41 AFLAGS_IMPLICIT_IT      := $(call as-option,-Wa$(comma)-mimplicit-it=always)
  42 PF_CPPFLAGS_ARM         := $(AFLAGS_IMPLICIT_IT) \
  43                         $(call cc-option, -mthumb -mthumb-interwork,\
  44                         $(call cc-option,-marm,)\
  45                         $(call cc-option,-mno-thumb-interwork,)\
  46                 )
  47 else
  48 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  49                 $(call cc-option,-mno-thumb-interwork,)
  50 endif
  51
  52 # Only test once
  53 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
  54 archprepare: checkthumb checkgcc6
  55
  56 checkthumb:
  57         @if test "$(call cc-name)" = "gcc" -a \
  58                         "$(call cc-version)" -lt "0404"; then \
  59                 echo -n '*** Your GCC does not produce working '; \
  60                 echo 'binaries in THUMB mode.'; \
  61                 echo '*** Your board is configured for THUMB mode.'; \
  62                 false; \
  63         fi
  64 else
  65 archprepare: checkgcc6
  66 endif
  67
  68 checkgcc6:
  69         @if test "$(call cc-name)" = "gcc" -a \
  70                         "$(call cc-version)" -lt "0600"; then \
  71                 echo -n '*** Your GCC is older than 6.0 and will not be '; \
  72                 echo 'supported starting in v2018.01.'; \
  73         fi
  74
  75
  76 # Try if EABI is supported, else fall back to old API,
  77 # i. e. for example:
  78 # - with ELDK 4.2 (EABI supported), use:
  79 #       -mabi=aapcs-linux
  80 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  81 #       -mabi=apcs-gnu
  82 # - with ELDK 3.1 (gcc 3.x), use:
  83 #       -mapcs-32
  84 PF_CPPFLAGS_ABI := $(call cc-option,\
  85                         -mabi=aapcs-linux,\
  86                         $(call cc-option,\
  87                                 -mapcs-32,\
  88                                 $(call cc-option,\
  89                                         -mabi=apcs-gnu,\
  90                                 )\
  91                         )\
  92                 )
  93 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  94
  95 # For EABI, make sure to provide raise()
  96 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  97 # This file is parsed many times, so the string may get added multiple
  98 # times. Also, the prefix needs to be different based on whether
  99 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
 100 # before adding the correct one.
 101 PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
 102         $(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
 103 endif
 104
 105 # needed for relocation
 106 LDFLAGS_u-boot += -pie
 107
 108 #
 109 # FIXME: binutils versions < 2.22 have a bug in the assembler where
 110 # branches to weak symbols can be incorrectly optimized in thumb mode
 111 # to a short branch (b.n instruction) that won't reach when the symbol
 112 # gets preempted
 113 #
 114 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
 115 #
 116 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
 117 ifeq ($(GAS_BUG_12532),)
 118 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
 119         then echo y; else echo n; fi)
 120 endif
 121 ifeq ($(GAS_BUG_12532),y)
 122 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
 123 endif
 124 endif
 125
 126 ifneq ($(CONFIG_SPL_BUILD),y)
 127 # Check that only R_ARM_RELATIVE relocations are generated.
 128 ALL-y += checkarmreloc
 129 # The movt / movw can hardcode 16 bit parts of the addresses in the
 130 # instruction. Relocation is not supported for that case, so disable
 131 # such usage by requiring word relocations.
 132 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 133 PLATFORM_CPPFLAGS += $(call cc-option, -fno-pic)
 134 endif
 135
 136 # limit ourselves to the sections we want in the .bin.
 137 ifdef CONFIG_ARM64
 138 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .data \
 139                 -j .u_boot_list -j .rela.dyn -j .got -j .got.plt
 140 else
 141 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \
 142                 -j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn
 143 endif
 144
 145 ifdef CONFIG_OF_EMBED
 146 OBJCOPYFLAGS += -j .dtb.init.rodata
 147 endif
 148
 149 ifdef CONFIG_EFI_LOADER
 150 OBJCOPYFLAGS += -j .efi_runtime -j .efi_runtime_rel
 151 endif
 152
 153 ifneq ($(CONFIG_IMX_CONFIG),)
 154 ifdef CONFIG_SPL
 155 ifndef CONFIG_SPL_BUILD
 156 ALL-y += SPL
 157 endif
 158 else
 159 ifeq ($(CONFIG_OF_SEPARATE),y)
 160 ALL-y += u-boot-dtb.imx
 161 else
 162 ALL-y += u-boot.imx
 163 endif
 164 endif
 165 ifneq ($(CONFIG_VF610),)
 166 ALL-y += u-boot.vyb
 167 endif
 168 endif
 169
 170 EFI_LDS := elf_arm_efi.lds
 171 EFI_CRT0 := crt0_arm_efi.o
 172 EFI_RELOC := reloc_arm_efi.o