xref: /linux/arch/arm/boot/compressed/Makefile (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732) 
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
54#
55# We now have a PIC decompressor implementation.  Decompressors running
56# from RAM should not define ZTEXTADDR.  Decompressors running directly
57# from ROM or Flash must define ZTEXTADDR (preferably via the config)
58# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
59ifeq ($(CONFIG_ZBOOT_ROM),y)
60ZTEXTADDR	:= $(CONFIG_ZBOOT_ROM_TEXT)
61ZBSSADDR	:= $(CONFIG_ZBOOT_ROM_BSS)
62else
63ZTEXTADDR	:= 0
64ZBSSADDR	:= ALIGN(8)
65endif
66
67CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
68
69suffix_$(CONFIG_KERNEL_GZIP) = gzip
70suffix_$(CONFIG_KERNEL_LZO)  = lzo
71suffix_$(CONFIG_KERNEL_LZMA) = lzma
72suffix_$(CONFIG_KERNEL_XZ)   = xzkern
73suffix_$(CONFIG_KERNEL_LZ4)  = lz4
74
75# Borrowed libfdt files for the ATAG compatibility mode
76
77libfdt		:= fdt_rw.c fdt_ro.c fdt_wip.c fdt.c
78libfdt_hdrs	:= fdt.h libfdt.h libfdt_internal.h
79
80libfdt_objs	:= $(addsuffix .o, $(basename $(libfdt)))
81
82$(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
83	$(call cmd,shipped)
84
85$(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \
86	$(addprefix $(obj)/,$(libfdt_hdrs))
87
88ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
89OBJS	+= $(libfdt_objs) atags_to_fdt.o
90endif
91
92targets       := vmlinux vmlinux.lds \
93		 piggy.$(suffix_y) piggy.$(suffix_y).o \
94		 lib1funcs.o lib1funcs.S ashldi3.o ashldi3.S bswapsdi2.o \
95		 bswapsdi2.S font.o font.c head.o misc.o $(OBJS)
96
97# Make sure files are removed during clean
98extra-y       += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern piggy.lz4 \
99		 lib1funcs.S ashldi3.S bswapsdi2.S $(libfdt) $(libfdt_hdrs) \
100		 hyp-stub.S
101
102KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
103
104ifeq ($(CONFIG_FUNCTION_TRACER),y)
105ORIG_CFLAGS := $(KBUILD_CFLAGS)
106KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
107endif
108
109ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
110asflags-y := -DZIMAGE
111
112# Supply kernel BSS size to the decompressor via a linker symbol.
113KBSS_SZ = $(shell $(CROSS_COMPILE)size $(obj)/../../../../vmlinux | \
114		awk 'END{print $$3}')
115LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
116# Supply ZRELADDR to the decompressor via a linker symbol.
117ifneq ($(CONFIG_AUTO_ZRELADDR),y)
118LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
119endif
120ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
121LDFLAGS_vmlinux += --be8
122endif
123# ?
124LDFLAGS_vmlinux += -p
125# Report unresolved symbol references
126LDFLAGS_vmlinux += --no-undefined
127# Delete all temporary local symbols
128LDFLAGS_vmlinux += -X
129# Next argument is a linker script
130LDFLAGS_vmlinux += -T
131
132# For __aeabi_uidivmod
133lib1funcs = $(obj)/lib1funcs.o
134
135$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
136	$(call cmd,shipped)
137
138# For __aeabi_llsl
139ashldi3 = $(obj)/ashldi3.o
140
141$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
142	$(call cmd,shipped)
143
144# For __bswapsi2, __bswapdi2
145bswapsdi2 = $(obj)/bswapsdi2.o
146
147$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
148	$(call cmd,shipped)
149
150# We need to prevent any GOTOFF relocs being used with references
151# to symbols in the .bss section since we cannot relocate them
152# independently from the rest at run time.  This can be achieved by
153# ensuring that no private .bss symbols exist, as global symbols
154# always have a GOT entry which is what we need.
155# The .data section is already discarded by the linker script so no need
156# to bother about it here.
157check_for_bad_syms = \
158bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
159[ -z "$$bad_syms" ] || \
160  ( echo "following symbols must have non local/private scope:" >&2; \
161    echo "$$bad_syms" >&2; rm -f $@; false )
162
163check_for_multiple_zreladdr = \
164if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
165	echo 'multiple zreladdrs: $(ZRELADDR)'; \
166	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
167	false; \
168fi
169
170$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
171		$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
172		$(bswapsdi2) FORCE
173	@$(check_for_multiple_zreladdr)
174	$(call if_changed,ld)
175	@$(check_for_bad_syms)
176
177$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
178	$(call if_changed,$(suffix_y))
179
180$(obj)/piggy.$(suffix_y).o:  $(obj)/piggy.$(suffix_y) FORCE
181
182CFLAGS_font.o := -Dstatic=
183
184$(obj)/font.c: $(FONTC)
185	$(call cmd,shipped)
186
187$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
188	$(call cmd,shipped)
189