xref: /linux/arch/arm/boot/compressed/Makefile (revision b3e5ced63e051e8f911b795ac5b06229a5328f7b) 
1#
2# linux/arch/arm/boot/compressed/Makefile
3#
4# create a compressed vmlinuz image from the original vmlinux
5#
6
7OBJS		=
8
9AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
10HEAD	= head.o
11OBJS	+= misc.o decompress.o
12ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
13OBJS	+= debug.o
14endif
15FONTC	= $(srctree)/lib/fonts/font_acorn_8x8.c
16
17# string library code (-Os is enforced to keep it much smaller)
18OBJS		+= string.o
19CFLAGS_string.o	:= -Os
20
21ifeq ($(CONFIG_ARM_VIRT_EXT),y)
22OBJS		+= hyp-stub.o
23endif
24
25GCOV_PROFILE		:= n
26
27#
28# Architecture dependencies
29#
30ifeq ($(CONFIG_ARCH_ACORN),y)
31OBJS		+= ll_char_wr.o font.o
32endif
33
34ifeq ($(CONFIG_ARCH_SA1100),y)
35OBJS		+= head-sa1100.o
36endif
37
38ifeq ($(CONFIG_CPU_XSCALE),y)
39OBJS		+= head-xscale.o
40endif
41
42ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
43OBJS		+= head-sharpsl.o
44endif
45
46ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
47ifeq ($(CONFIG_CPU_CP15),y)
48OBJS		+= big-endian.o
49else
50# The endian should be set by h/w design.
51endif
52endif
53
54ifeq ($(CONFIG_ARCH_SHMOBILE_LEGACY),y)
55OBJS		+= head-shmobile.o
56endif
57
58#
59# We now have a PIC decompressor implementation.  Decompressors running
60# from RAM should not define ZTEXTADDR.  Decompressors running directly
61# from ROM or Flash must define ZTEXTADDR (preferably via the config)
62# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
63ifeq ($(CONFIG_ZBOOT_ROM),y)
64ZTEXTADDR	:= $(CONFIG_ZBOOT_ROM_TEXT)
65ZBSSADDR	:= $(CONFIG_ZBOOT_ROM_BSS)
66else
67ZTEXTADDR	:= 0
68ZBSSADDR	:= ALIGN(8)
69endif
70
71CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
72
73suffix_$(CONFIG_KERNEL_GZIP) = gzip
74suffix_$(CONFIG_KERNEL_LZO)  = lzo
75suffix_$(CONFIG_KERNEL_LZMA) = lzma
76suffix_$(CONFIG_KERNEL_XZ)   = xzkern
77suffix_$(CONFIG_KERNEL_LZ4)  = lz4
78
79# Borrowed libfdt files for the ATAG compatibility mode
80
81libfdt		:= fdt_rw.c fdt_ro.c fdt_wip.c fdt.c
82libfdt_hdrs	:= fdt.h libfdt.h libfdt_internal.h
83
84libfdt_objs	:= $(addsuffix .o, $(basename $(libfdt)))
85
86$(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
87	$(call cmd,shipped)
88
89$(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \
90	$(addprefix $(obj)/,$(libfdt_hdrs))
91
92ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
93OBJS	+= $(libfdt_objs) atags_to_fdt.o
94endif
95
96targets       := vmlinux vmlinux.lds \
97		 piggy.$(suffix_y) piggy.$(suffix_y).o \
98		 lib1funcs.o lib1funcs.S ashldi3.o ashldi3.S bswapsdi2.o \
99		 bswapsdi2.S font.o font.c head.o misc.o $(OBJS)
100
101# Make sure files are removed during clean
102extra-y       += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern piggy.lz4 \
103		 lib1funcs.S ashldi3.S bswapsdi2.S $(libfdt) $(libfdt_hdrs) \
104		 hyp-stub.S
105
106ifeq ($(CONFIG_FUNCTION_TRACER),y)
107ORIG_CFLAGS := $(KBUILD_CFLAGS)
108KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
109endif
110
111ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
112asflags-y := -DZIMAGE
113
114# Supply kernel BSS size to the decompressor via a linker symbol.
115KBSS_SZ = $(shell $(CROSS_COMPILE)size $(obj)/../../../../vmlinux | \
116		awk 'END{print $$3}')
117LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
118# Supply ZRELADDR to the decompressor via a linker symbol.
119ifneq ($(CONFIG_AUTO_ZRELADDR),y)
120LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
121endif
122ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
123LDFLAGS_vmlinux += --be8
124endif
125# ?
126LDFLAGS_vmlinux += -p
127# Report unresolved symbol references
128LDFLAGS_vmlinux += --no-undefined
129# Delete all temporary local symbols
130LDFLAGS_vmlinux += -X
131# Next argument is a linker script
132LDFLAGS_vmlinux += -T
133
134# For __aeabi_uidivmod
135lib1funcs = $(obj)/lib1funcs.o
136
137$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
138	$(call cmd,shipped)
139
140# For __aeabi_llsl
141ashldi3 = $(obj)/ashldi3.o
142
143$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
144	$(call cmd,shipped)
145
146# For __bswapsi2, __bswapdi2
147bswapsdi2 = $(obj)/bswapsdi2.o
148
149$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
150	$(call cmd,shipped)
151
152# We need to prevent any GOTOFF relocs being used with references
153# to symbols in the .bss section since we cannot relocate them
154# independently from the rest at run time.  This can be achieved by
155# ensuring that no private .bss symbols exist, as global symbols
156# always have a GOT entry which is what we need.
157# The .data section is already discarded by the linker script so no need
158# to bother about it here.
159check_for_bad_syms = \
160bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
161[ -z "$$bad_syms" ] || \
162  ( echo "following symbols must have non local/private scope:" >&2; \
163    echo "$$bad_syms" >&2; rm -f $@; false )
164
165check_for_multiple_zreladdr = \
166if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
167	echo 'multiple zreladdrs: $(ZRELADDR)'; \
168	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
169	false; \
170fi
171
172$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
173		$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
174		$(bswapsdi2) FORCE
175	@$(check_for_multiple_zreladdr)
176	$(call if_changed,ld)
177	@$(check_for_bad_syms)
178
179$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
180	$(call if_changed,$(suffix_y))
181
182$(obj)/piggy.$(suffix_y).o:  $(obj)/piggy.$(suffix_y) FORCE
183
184CFLAGS_font.o := -Dstatic=
185
186$(obj)/font.c: $(FONTC)
187	$(call cmd,shipped)
188
189$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
190	$(call cmd,shipped)
191