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
10HEAD	= head.o
11OBJS	+= misc.o decompress.o
12ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
13OBJS	+= debug.o
14AFLAGS_head.o += -DDEBUG
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
27KASAN_SANITIZE		:= n
28
29# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
30KCOV_INSTRUMENT		:= n
31
32#
33# Architecture dependencies
34#
35ifeq ($(CONFIG_ARCH_ACORN),y)
36OBJS		+= ll_char_wr.o font.o
37endif
38
39ifeq ($(CONFIG_ARCH_SA1100),y)
40OBJS		+= head-sa1100.o
41endif
42
43ifeq ($(CONFIG_CPU_XSCALE),y)
44OBJS		+= head-xscale.o
45endif
46
47ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
48OBJS		+= head-sharpsl.o
49endif
50
51ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
52ifeq ($(CONFIG_CPU_CP15),y)
53OBJS		+= big-endian.o
54else
55# The endian should be set by h/w design.
56endif
57endif
58
59#
60# We now have a PIC decompressor implementation.  Decompressors running
61# from RAM should not define ZTEXTADDR.  Decompressors running directly
62# from ROM or Flash must define ZTEXTADDR (preferably via the config)
63# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
64ifeq ($(CONFIG_ZBOOT_ROM),y)
65ZTEXTADDR	:= $(CONFIG_ZBOOT_ROM_TEXT)
66ZBSSADDR	:= $(CONFIG_ZBOOT_ROM_BSS)
67else
68ZTEXTADDR	:= 0
69ZBSSADDR	:= ALIGN(8)
70endif
71
72MALLOC_SIZE	:= 65536
73
74AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
75CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
76CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
77CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
78
79compress-$(CONFIG_KERNEL_GZIP) = gzip
80compress-$(CONFIG_KERNEL_LZO)  = lzo
81compress-$(CONFIG_KERNEL_LZMA) = lzma
82compress-$(CONFIG_KERNEL_XZ)   = xzkern
83compress-$(CONFIG_KERNEL_LZ4)  = lz4
84
85libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
86
87ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
88CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN}
89CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280
90OBJS	+= $(libfdt_objs) atags_to_fdt.o
91endif
92ifeq ($(CONFIG_USE_OF),y)
93OBJS	+= $(libfdt_objs) fdt_check_mem_start.o
94endif
95
96# -fstack-protector-strong triggers protection checks in this code,
97# but it is being used too early to link to meaningful stack_chk logic.
98$(foreach o, $(libfdt_objs) atags_to_fdt.o fdt_check_mem_start.o, \
99	$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
100
101targets       := vmlinux vmlinux.lds piggy_data piggy.o \
102		 lib1funcs.o ashldi3.o bswapsdi2.o \
103		 head.o $(OBJS)
104
105clean-files += lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S
106
107KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
108
109ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
110	     -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
111ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
112asflags-y := -DZIMAGE
113
114# Supply kernel BSS size to the decompressor via a linker symbol.
115KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
116		sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \
117		       -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) )
118LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
119# Supply ZRELADDR to the decompressor via a linker symbol.
120ifneq ($(CONFIG_AUTO_ZRELADDR),y)
121LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
122endif
123ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
124LDFLAGS_vmlinux += --be8
125endif
126# Report unresolved symbol references
127LDFLAGS_vmlinux += --no-undefined
128# Delete all temporary local symbols
129LDFLAGS_vmlinux += -X
130# Report orphan sections
131ifdef CONFIG_LD_ORPHAN_WARN
132LDFLAGS_vmlinux += --orphan-handling=warn
133endif
134# Next argument is a linker script
135LDFLAGS_vmlinux += -T
136
137# For __aeabi_uidivmod
138lib1funcs = $(obj)/lib1funcs.o
139
140$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
141	$(call cmd,shipped)
142
143# For __aeabi_llsl
144ashldi3 = $(obj)/ashldi3.o
145
146$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
147	$(call cmd,shipped)
148
149# For __bswapsi2, __bswapdi2
150bswapsdi2 = $(obj)/bswapsdi2.o
151
152$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
153	$(call cmd,shipped)
154
155# We need to prevent any GOTOFF relocs being used with references
156# to symbols in the .bss section since we cannot relocate them
157# independently from the rest at run time.  This can be achieved by
158# ensuring that no private .bss symbols exist, as global symbols
159# always have a GOT entry which is what we need.
160# The .data section is already discarded by the linker script so no need
161# to bother about it here.
162check_for_bad_syms = \
163bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
164[ -z "$$bad_syms" ] || \
165  ( echo "following symbols must have non local/private scope:" >&2; \
166    echo "$$bad_syms" >&2; false )
167
168check_for_multiple_zreladdr = \
169if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
170	echo 'multiple zreladdrs: $(ZRELADDR)'; \
171	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
172	false; \
173fi
174
175efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
176
177$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
178		$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
179		$(bswapsdi2) $(efi-obj-y) FORCE
180	@$(check_for_multiple_zreladdr)
181	$(call if_changed,ld)
182	@$(check_for_bad_syms)
183
184$(obj)/piggy_data: $(obj)/../Image FORCE
185	$(call if_changed,$(compress-y))
186
187$(obj)/piggy.o: $(obj)/piggy_data
188
189CFLAGS_font.o := -Dstatic=
190
191$(obj)/font.c: $(FONTC)
192	$(call cmd,shipped)
193
194AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
195
196$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
197	$(call cmd,shipped)
198