xref: /openbmc/linux/arch/arm/boot/compressed/Makefile (revision ba61bb17)
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# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
29KCOV_INSTRUMENT		:= n
30
31#
32# Architecture dependencies
33#
34ifeq ($(CONFIG_ARCH_ACORN),y)
35OBJS		+= ll_char_wr.o font.o
36endif
37
38ifeq ($(CONFIG_ARCH_SA1100),y)
39OBJS		+= head-sa1100.o
40endif
41
42ifeq ($(CONFIG_CPU_XSCALE),y)
43OBJS		+= head-xscale.o
44endif
45
46ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
47OBJS		+= head-sharpsl.o
48endif
49
50ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
51ifeq ($(CONFIG_CPU_CP15),y)
52OBJS		+= big-endian.o
53else
54# The endian should be set by h/w design.
55endif
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="$(ZBSSADDR)"
72
73compress-$(CONFIG_KERNEL_GZIP) = gzip
74compress-$(CONFIG_KERNEL_LZO)  = lzo
75compress-$(CONFIG_KERNEL_LZMA) = lzma
76compress-$(CONFIG_KERNEL_XZ)   = xzkern
77compress-$(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 piggy_data piggy.o \
97		 lib1funcs.o ashldi3.o bswapsdi2.o \
98		 head.o $(OBJS)
99
100clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S \
101		$(libfdt) $(libfdt_hdrs) hyp-stub.S
102
103KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
104
105ifeq ($(CONFIG_FUNCTION_TRACER),y)
106ORIG_CFLAGS := $(KBUILD_CFLAGS)
107KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
108endif
109
110# -fstack-protector-strong triggers protection checks in this code,
111# but it is being used too early to link to meaningful stack_chk logic.
112nossp_flags := $(call cc-option, -fno-stack-protector)
113CFLAGS_atags_to_fdt.o := $(nossp_flags)
114CFLAGS_fdt.o := $(nossp_flags)
115CFLAGS_fdt_ro.o := $(nossp_flags)
116CFLAGS_fdt_rw.o := $(nossp_flags)
117CFLAGS_fdt_wip.o := $(nossp_flags)
118
119ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin -I$(obj)
120asflags-y := -DZIMAGE
121
122# Supply kernel BSS size to the decompressor via a linker symbol.
123KBSS_SZ = $(shell echo $$(($$($(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \
124		sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
125		       -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
126LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
127# Supply ZRELADDR to the decompressor via a linker symbol.
128ifneq ($(CONFIG_AUTO_ZRELADDR),y)
129LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
130endif
131ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
132LDFLAGS_vmlinux += --be8
133endif
134# ?
135LDFLAGS_vmlinux += -p
136# Report unresolved symbol references
137LDFLAGS_vmlinux += --no-undefined
138# Delete all temporary local symbols
139LDFLAGS_vmlinux += -X
140# Next argument is a linker script
141LDFLAGS_vmlinux += -T
142
143# For __aeabi_uidivmod
144lib1funcs = $(obj)/lib1funcs.o
145
146$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
147	$(call cmd,shipped)
148
149# For __aeabi_llsl
150ashldi3 = $(obj)/ashldi3.o
151
152$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
153	$(call cmd,shipped)
154
155# For __bswapsi2, __bswapdi2
156bswapsdi2 = $(obj)/bswapsdi2.o
157
158$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
159	$(call cmd,shipped)
160
161# We need to prevent any GOTOFF relocs being used with references
162# to symbols in the .bss section since we cannot relocate them
163# independently from the rest at run time.  This can be achieved by
164# ensuring that no private .bss symbols exist, as global symbols
165# always have a GOT entry which is what we need.
166# The .data section is already discarded by the linker script so no need
167# to bother about it here.
168check_for_bad_syms = \
169bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
170[ -z "$$bad_syms" ] || \
171  ( echo "following symbols must have non local/private scope:" >&2; \
172    echo "$$bad_syms" >&2; rm -f $@; false )
173
174check_for_multiple_zreladdr = \
175if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
176	echo 'multiple zreladdrs: $(ZRELADDR)'; \
177	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
178	false; \
179fi
180
181efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
182
183$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
184		$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
185		$(bswapsdi2) $(efi-obj-y) FORCE
186	@$(check_for_multiple_zreladdr)
187	$(call if_changed,ld)
188	@$(check_for_bad_syms)
189
190$(obj)/piggy_data: $(obj)/../Image FORCE
191	$(call if_changed,$(compress-y))
192
193$(obj)/piggy.o: $(obj)/piggy_data
194
195CFLAGS_font.o := -Dstatic=
196
197$(obj)/font.c: $(FONTC)
198	$(call cmd,shipped)
199
200AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
201
202$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
203	$(call cmd,shipped)
204