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