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_OMAP_COMMON),)
  10 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
  11 else
  12 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  13 endif
  14 endif
  15
  16 LDFLAGS_FINAL += --gc-sections
  17 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
  18                      -fno-common -ffixed-r9
  19 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
  20       $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
  21
  22 # Support generic board on ARM
  23 __HAVE_ARCH_GENERIC_BOARD := y
  24
  25 PLATFORM_CPPFLAGS += -D__ARM__
  26
  27 # Choose between ARM/Thumb instruction sets
  28 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  29 AFLAGS_IMPLICIT_IT      := $(call as-option,-Wa$(comma)-mimplicit-it=always)
  30 PF_CPPFLAGS_ARM         := $(AFLAGS_IMPLICIT_IT) \
  31                         $(call cc-option, -mthumb -mthumb-interwork,\
  32                         $(call cc-option,-marm,)\
  33                         $(call cc-option,-mno-thumb-interwork,)\
  34                 )
  35 else
  36 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  37                 $(call cc-option,-mno-thumb-interwork,)
  38 endif
  39
  40 # Only test once
  41 ifneq ($(CONFIG_SPL_BUILD),y)
  42 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  43 archprepare: checkthumb
  44
  45 checkthumb:
  46         @if test "$(call cc-version)" -lt "0404"; then \
  47                 echo -n '*** Your GCC does not produce working '; \
  48                 echo 'binaries in THUMB mode.'; \
  49                 echo '*** Your board is configured for THUMB mode.'; \
  50                 false; \
  51         fi
  52 endif
  53 endif
  54
  55 # Try if EABI is supported, else fall back to old API,
  56 # i. e. for example:
  57 # - with ELDK 4.2 (EABI supported), use:
  58 #       -mabi=aapcs-linux
  59 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  60 #       -mabi=apcs-gnu
  61 # - with ELDK 3.1 (gcc 3.x), use:
  62 #       -mapcs-32
  63 PF_CPPFLAGS_ABI := $(call cc-option,\
  64                         -mabi=aapcs-linux,\
  65                         $(call cc-option,\
  66                                 -mapcs-32,\
  67                                 $(call cc-option,\
  68                                         -mabi=apcs-gnu,\
  69                                 )\
  70                         )\
  71                 )
  72 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  73
  74 # For EABI, make sure to provide raise()
  75 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  76 # This file is parsed many times, so the string may get added multiple
  77 # times. Also, the prefix needs to be different based on whether
  78 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
  79 # before adding the correct one.
  80 PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
  81         $(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  82 endif
  83
  84 # needed for relocation
  85 LDFLAGS_u-boot += -pie
  86
  87 #
  88 # FIXME: binutils versions < 2.22 have a bug in the assembler where
  89 # branches to weak symbols can be incorrectly optimized in thumb mode
  90 # to a short branch (b.n instruction) that won't reach when the symbol
  91 # gets preempted
  92 #
  93 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
  94 #
  95 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  96 ifeq ($(GAS_BUG_12532),)
  97 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
  98         then echo y; else echo n; fi)
  99 endif
 100 ifeq ($(GAS_BUG_12532),y)
 101 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
 102 endif
 103 endif
 104
 105 ifneq ($(CONFIG_SPL_BUILD),y)
 106 # Check that only R_ARM_RELATIVE relocations are generated.
 107 ALL-y += checkarmreloc
 108 # The movt / movw can hardcode 16 bit parts of the addresses in the
 109 # instruction. Relocation is not supported for that case, so disable
 110 # such usage by requiring word relocations.
 111 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 112 endif
 113
 114 # limit ourselves to the sections we want in the .bin.
 115 ifdef CONFIG_ARM64
 116 OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
 117 else
 118 OBJCOPYFLAGS += -j .text -j .secure_text -j .rodata -j .hash -j .data -j .got.plt -j .u_boot_list -j .rel.dyn
 119 endif
 120
 121 ifdef CONFIG_OF_EMBED
 122 OBJCOPYFLAGS += -j .dtb.init.rodata
 123 endif
 124
 125 ifneq ($(CONFIG_IMX_CONFIG),)
 126 ifdef CONFIG_SPL
 127 ifndef CONFIG_SPL_BUILD
 128 ALL-y += SPL
 129 endif
 130 else
 131 ifeq ($(CONFIG_OF_SEPARATE),y)
 132 ALL-y += u-boot-dtb.imx
 133 else
 134 ALL-y += u-boot.imx
 135 endif
 136 endif
 137 endif