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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 LLVM_RELFLAGS           := $(call cc-option,-mllvm,) \
27                         $(call cc-option,-mno-movt,)
28 PLATFORM_RELFLAGS       += $(LLVM_RELFLAGS)
29
30 PLATFORM_CPPFLAGS += -D__ARM__
31
32 ifdef CONFIG_ARM64
33 PLATFORM_ELFFLAGS += -B aarch64 -O elf64-littleaarch64
34 else
35 PLATFORM_ELFFLAGS += -B arm -O elf32-littlearm
36 endif
37
38 # Choose between ARM/Thumb instruction sets
39 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
40 AFLAGS_IMPLICIT_IT      := $(call as-option,-Wa$(comma)-mimplicit-it=always)
41 PF_CPPFLAGS_ARM         := $(AFLAGS_IMPLICIT_IT) \
42                         $(call cc-option, -mthumb -mthumb-interwork,\
43                         $(call cc-option,-marm,)\
44                         $(call cc-option,-mno-thumb-interwork,)\
45                 )
46 else
47 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
48                 $(call cc-option,-mno-thumb-interwork,)
49 endif
50
51 # Only test once
52 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
53 archprepare: checkthumb checkgcc6
54
55 checkthumb:
56         @if test "$(call cc-name)" = "gcc" -a \
57                         "$(call cc-version)" -lt "0404"; then \
58                 echo -n '*** Your GCC does not produce working '; \
59                 echo 'binaries in THUMB mode.'; \
60                 echo '*** Your board is configured for THUMB mode.'; \
61                 false; \
62         fi
63 else
64 archprepare: checkgcc6
65 endif
66
67 checkgcc6:
68         @if test "$(call cc-name)" = "gcc" -a \
69                         "$(call cc-version)" -lt "0600"; then \
70                 echo '*** Your GCC is older than 6.0 and is not supported'; \
71                 false; \
72         fi
73
74
75 # Try if EABI is supported, else fall back to old API,
76 # i. e. for example:
77 # - with ELDK 4.2 (EABI supported), use:
78 #       -mabi=aapcs-linux
79 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
80 #       -mabi=apcs-gnu
81 # - with ELDK 3.1 (gcc 3.x), use:
82 #       -mapcs-32
83 PF_CPPFLAGS_ABI := $(call cc-option,\
84                         -mabi=aapcs-linux,\
85                         $(call cc-option,\
86                                 -mapcs-32,\
87                                 $(call cc-option,\
88                                         -mabi=apcs-gnu,\
89                                 )\
90                         )\
91                 )
92 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
93
94 # For EABI, make sure to provide raise()
95 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
96 # This file is parsed many times, so the string may get added multiple
97 # times. Also, the prefix needs to be different based on whether
98 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
99 # before adding the correct one.
100 PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
101         $(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
102 endif
103
104 # needed for relocation
105 LDFLAGS_u-boot += -pie
106
107 #
108 # FIXME: binutils versions < 2.22 have a bug in the assembler where
109 # branches to weak symbols can be incorrectly optimized in thumb mode
110 # to a short branch (b.n instruction) that won't reach when the symbol
111 # gets preempted
112 #
113 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
114 #
115 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
116 ifeq ($(GAS_BUG_12532),)
117 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
118         then echo y; else echo n; fi)
119 endif
120 ifeq ($(GAS_BUG_12532),y)
121 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
122 endif
123 endif
124
125 ifneq ($(CONFIG_SPL_BUILD),y)
126 # Check that only R_ARM_RELATIVE relocations are generated.
127 ALL-y += checkarmreloc
128 # The movt / movw can hardcode 16 bit parts of the addresses in the
129 # instruction. Relocation is not supported for that case, so disable
130 # such usage by requiring word relocations.
131 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
132 PLATFORM_CPPFLAGS += $(call cc-option, -fno-pic)
133 endif
134
135 # limit ourselves to the sections we want in the .bin.
136 ifdef CONFIG_ARM64
137 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .data \
138                 -j .u_boot_list -j .rela.dyn -j .got -j .got.plt \
139                 -j .binman_sym_table
140 else
141 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \
142                 -j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn \
143                 -j .binman_sym_table
144 endif
145
146 # if a dtb section exists we always have to include it
147 # there are only two cases where it is generated
148 # 1) OF_EMBEDED is turned on
149 # 2) unit tests include device tree blobs
150 OBJCOPYFLAGS += -j .dtb.init.rodata
151
152 ifdef CONFIG_EFI_LOADER
153 OBJCOPYFLAGS += -j .efi_runtime -j .efi_runtime_rel
154 endif
155
156 ifneq ($(CONFIG_IMX_CONFIG),)
157 ifdef CONFIG_SPL
158 ifndef CONFIG_SPL_BUILD
159 ALL-y += SPL
160 endif
161 else
162 ifeq ($(CONFIG_OF_SEPARATE),y)
163 ALL-y += u-boot-dtb.imx
164 else
165 ALL-y += u-boot.imx
166 endif
167 endif
168 ifneq ($(CONFIG_VF610),)
169 ALL-y += u-boot.vyb
170 endif
171 endif
172
173 EFI_LDS := elf_arm_efi.lds
174 EFI_CRT0 := crt0_arm_efi.o
175 EFI_RELOC := reloc_arm_efi.o