xref: /linux/arch/arm/boot/compressed/Makefile (revision 6f52b16c5b29b89d92c0e7236f4655dc8491ad70)
1# SPDX-License-Identifier: GPL-2.0
2#
3# linux/arch/arm/boot/compressed/Makefile
4#
5# create a compressed vmlinuz image from the original vmlinux
6#
7
8OBJS		=
9
10AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
11HEAD	= head.o
12OBJS	+= misc.o decompress.o
13ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
14OBJS	+= debug.o
15endif
16FONTC	= $(srctree)/lib/fonts/font_acorn_8x8.c
17
18# string library code (-Os is enforced to keep it much smaller)
19OBJS		+= string.o
20CFLAGS_string.o	:= -Os
21
22ifeq ($(CONFIG_ARM_VIRT_EXT),y)
23OBJS		+= hyp-stub.o
24endif
25
26GCOV_PROFILE		:= n
27
28#
29# Architecture dependencies
30#
31ifeq ($(CONFIG_ARCH_ACORN),y)
32OBJS		+= ll_char_wr.o font.o
33endif
34
35ifeq ($(CONFIG_ARCH_SA1100),y)
36OBJS		+= head-sa1100.o
37endif
38
39ifeq ($(CONFIG_CPU_XSCALE),y)
40OBJS		+= head-xscale.o
41endif
42
43ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
44OBJS		+= head-sharpsl.o
45endif
46
47ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
48ifeq ($(CONFIG_CPU_CP15),y)
49OBJS		+= big-endian.o
50else
51# The endian should be set by h/w design.
52endif
53endif
54
55#
56# We now have a PIC decompressor implementation.  Decompressors running
57# from RAM should not define ZTEXTADDR.  Decompressors running directly
58# from ROM or Flash must define ZTEXTADDR (preferably via the config)
59# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
60ifeq ($(CONFIG_ZBOOT_ROM),y)
61ZTEXTADDR	:= $(CONFIG_ZBOOT_ROM_TEXT)
62ZBSSADDR	:= $(CONFIG_ZBOOT_ROM_BSS)
63else
64ZTEXTADDR	:= 0
65ZBSSADDR	:= ALIGN(8)
66endif
67
68CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
69
70compress-$(CONFIG_KERNEL_GZIP) = gzip
71compress-$(CONFIG_KERNEL_LZO)  = lzo
72compress-$(CONFIG_KERNEL_LZMA) = lzma
73compress-$(CONFIG_KERNEL_XZ)   = xzkern
74compress-$(CONFIG_KERNEL_LZ4)  = lz4
75
76# Borrowed libfdt files for the ATAG compatibility mode
77
78libfdt		:= fdt_rw.c fdt_ro.c fdt_wip.c fdt.c
79libfdt_hdrs	:= fdt.h libfdt.h libfdt_internal.h
80
81libfdt_objs	:= $(addsuffix .o, $(basename $(libfdt)))
82
83$(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
84	$(call cmd,shipped)
85
86$(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \
87	$(addprefix $(obj)/,$(libfdt_hdrs))
88
89ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
90OBJS	+= $(libfdt_objs) atags_to_fdt.o
91endif
92
93targets       := vmlinux vmlinux.lds piggy_data piggy.o \
94		 lib1funcs.o ashldi3.o bswapsdi2.o \
95		 head.o $(OBJS)
96
97clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S \
98		$(libfdt) $(libfdt_hdrs) hyp-stub.S
99
100KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
101
102ifeq ($(CONFIG_FUNCTION_TRACER),y)
103ORIG_CFLAGS := $(KBUILD_CFLAGS)
104KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
105endif
106
107# -fstack-protector-strong triggers protection checks in this code,
108# but it is being used too early to link to meaningful stack_chk logic.
109nossp_flags := $(call cc-option, -fno-stack-protector)
110CFLAGS_atags_to_fdt.o := $(nossp_flags)
111CFLAGS_fdt.o := $(nossp_flags)
112CFLAGS_fdt_ro.o := $(nossp_flags)
113CFLAGS_fdt_rw.o := $(nossp_flags)
114CFLAGS_fdt_wip.o := $(nossp_flags)
115
116ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
117asflags-y := -DZIMAGE
118
119# Supply kernel BSS size to the decompressor via a linker symbol.
120KBSS_SZ = $(shell $(CROSS_COMPILE)size $(obj)/../../../../vmlinux | \
121		awk 'END{print $$3}')
122LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
123# Supply ZRELADDR to the decompressor via a linker symbol.
124ifneq ($(CONFIG_AUTO_ZRELADDR),y)
125LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
126endif
127ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
128LDFLAGS_vmlinux += --be8
129endif
130# ?
131LDFLAGS_vmlinux += -p
132# Report unresolved symbol references
133LDFLAGS_vmlinux += --no-undefined
134# Delete all temporary local symbols
135LDFLAGS_vmlinux += -X
136# Next argument is a linker script
137LDFLAGS_vmlinux += -T
138
139# For __aeabi_uidivmod
140lib1funcs = $(obj)/lib1funcs.o
141
142$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
143	$(call cmd,shipped)
144
145# For __aeabi_llsl
146ashldi3 = $(obj)/ashldi3.o
147
148$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
149	$(call cmd,shipped)
150
151# For __bswapsi2, __bswapdi2
152bswapsdi2 = $(obj)/bswapsdi2.o
153
154$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
155	$(call cmd,shipped)
156
157# We need to prevent any GOTOFF relocs being used with references
158# to symbols in the .bss section since we cannot relocate them
159# independently from the rest at run time.  This can be achieved by
160# ensuring that no private .bss symbols exist, as global symbols
161# always have a GOT entry which is what we need.
162# The .data section is already discarded by the linker script so no need
163# to bother about it here.
164check_for_bad_syms = \
165bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
166[ -z "$$bad_syms" ] || \
167  ( echo "following symbols must have non local/private scope:" >&2; \
168    echo "$$bad_syms" >&2; rm -f $@; false )
169
170check_for_multiple_zreladdr = \
171if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
172	echo 'multiple zreladdrs: $(ZRELADDR)'; \
173	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
174	false; \
175fi
176
177efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
178
179$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
180		$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
181		$(bswapsdi2) $(efi-obj-y) FORCE
182	@$(check_for_multiple_zreladdr)
183	$(call if_changed,ld)
184	@$(check_for_bad_syms)
185
186$(obj)/piggy_data: $(obj)/../Image FORCE
187	$(call if_changed,$(compress-y))
188
189$(obj)/piggy.o: $(obj)/piggy_data
190
191CFLAGS_font.o := -Dstatic=
192
193$(obj)/font.c: $(FONTC)
194	$(call cmd,shipped)
195
196AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
197
198$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
199	$(call cmd,shipped)
200