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