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 CROSS_COMPILE ?= arm-linux-
   9
  10 ifndef CONFIG_STANDALONE_LOAD_ADDR
  11 ifneq ($(CONFIG_OMAP_COMMON),)
  12 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
  13 else
  14 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  15 endif
  16 endif
  17
  18 LDFLAGS_FINAL += --gc-sections
  19 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
  20                      -fno-common -ffixed-r9
  21 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float)
  22
  23 # Support generic board on ARM
  24 __HAVE_ARCH_GENERIC_BOARD := y
  25
  26 PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
  27
  28 # Choose between ARM/Thumb instruction sets
  29 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  30 PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
  31                         $(call cc-option,-marm,)\
  32                         $(call cc-option,-mno-thumb-interwork,)\
  33                 )
  34 else
  35 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  36                 $(call cc-option,-mno-thumb-interwork,)
  37 endif
  38
  39 # Only test once
  40 ifneq ($(CONFIG_SPL_BUILD),y)
  41 ALL-$(CONFIG_SYS_THUMB_BUILD)   += checkthumb
  42 endif
  43
  44 # Try if EABI is supported, else fall back to old API,
  45 # i. e. for example:
  46 # - with ELDK 4.2 (EABI supported), use:
  47 #       -mabi=aapcs-linux
  48 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  49 #       -mabi=apcs-gnu
  50 # - with ELDK 3.1 (gcc 3.x), use:
  51 #       -mapcs-32
  52 PF_CPPFLAGS_ABI := $(call cc-option,\
  53                         -mabi=aapcs-linux,\
  54                         $(call cc-option,\
  55                                 -mapcs-32,\
  56                                 $(call cc-option,\
  57                                         -mabi=apcs-gnu,\
  58                                 )\
  59                         )\
  60                 )
  61 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  62
  63 # For EABI, make sure to provide raise()
  64 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  65 # This file is parsed many times, so the string may get added multiple
  66 # times. Also, the prefix needs to be different based on whether
  67 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
  68 # before adding the correct one.
  69 ifdef CONFIG_SPL_BUILD
  70 PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \
  71         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  72 else
  73 PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \
  74         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  75 endif
  76 endif
  77
  78 # needed for relocation
  79 LDFLAGS_u-boot += -pie
  80
  81 #
  82 # FIXME: binutils versions < 2.22 have a bug in the assembler where
  83 # branches to weak symbols can be incorrectly optimized in thumb mode
  84 # to a short branch (b.n instruction) that won't reach when the symbol
  85 # gets preempted
  86 #
  87 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
  88 #
  89 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  90 ifeq ($(GAS_BUG_12532),)
  91 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
  92         then echo y; else echo n; fi)
  93 endif
  94 ifeq ($(GAS_BUG_12532),y)
  95 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
  96 endif
  97 endif
  98
  99 ifneq ($(CONFIG_SPL_BUILD),y)
 100 # Check that only R_ARM_RELATIVE relocations are generated.
 101 ALL-y += checkarmreloc
 102 # The movt / movw can hardcode 16 bit parts of the addresses in the
 103 # instruction. Relocation is not supported for that case, so disable
 104 # such usage by requiring word relocations.
 105 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 106 endif
 107
 108 # limit ourselves to the sections we want in the .bin.
 109 ifdef CONFIG_ARM64
 110 OBJCFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
 111 else
 112 OBJCFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rel.dyn
 113 endif