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 ($(CONFIG_DEBUG_UNCOMPRESS),y)
13OBJS	+= debug.o
14AFLAGS_head.o += -DDEBUG
15endif
16
17# string library code (-Os is enforced to keep it much smaller)
18OBJS		+= string.o
19CFLAGS_string.o	:= -Os
20
21ifeq ($(CONFIG_ARM_VIRT_EXT),y)
22OBJS		+= hyp-stub.o
23endif
24
25GCOV_PROFILE		:= n
26KASAN_SANITIZE		:= 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	:= $(CONFIG_ZBOOT_ROM_BSS)
66else
67ZTEXTADDR	:= 0
68ZBSSADDR	:= ALIGN(8)
69endif
70
71MALLOC_SIZE	:= 65536
72
73AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
74CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
75CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
76CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
77
78compress-$(CONFIG_KERNEL_GZIP) = gzip
79compress-$(CONFIG_KERNEL_LZO)  = lzo_with_size
80compress-$(CONFIG_KERNEL_LZMA) = lzma_with_size
81compress-$(CONFIG_KERNEL_XZ)   = xzkern_with_size
82compress-$(CONFIG_KERNEL_LZ4)  = lz4_with_size
83
84libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
85
86ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
87CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN}
88CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280
89OBJS	+= $(libfdt_objs) atags_to_fdt.o
90endif
91ifeq ($(CONFIG_USE_OF),y)
92OBJS	+= $(libfdt_objs) fdt_check_mem_start.o
93endif
94
95OBJS	+= lib1funcs.o ashldi3.o bswapsdi2.o
96
97targets       := vmlinux vmlinux.lds piggy_data piggy.o \
98		 head.o $(OBJS)
99
100KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
101
102ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
103	     -I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \
104	     -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
105ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
106asflags-y := -DZIMAGE
107
108# Supply kernel BSS size to the decompressor via a linker symbol.
109KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
110		sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \
111		       -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) )
112LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
113# Supply ZRELADDR to the decompressor via a linker symbol.
114ifneq ($(CONFIG_AUTO_ZRELADDR),y)
115LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
116endif
117ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
118LDFLAGS_vmlinux += --be8
119endif
120# Report unresolved symbol references
121LDFLAGS_vmlinux += --no-undefined
122# Delete all temporary local symbols
123LDFLAGS_vmlinux += -X
124# Report orphan sections
125ifdef CONFIG_LD_ORPHAN_WARN
126LDFLAGS_vmlinux += --orphan-handling=warn
127endif
128# Next argument is a linker script
129LDFLAGS_vmlinux += -T
130
131# We need to prevent any GOTOFF relocs being used with references
132# to symbols in the .bss section since we cannot relocate them
133# independently from the rest at run time.  This can be achieved by
134# ensuring that no private .bss symbols exist, as global symbols
135# always have a GOT entry which is what we need.
136# The .data section is already discarded by the linker script so no need
137# to bother about it here.
138check_for_bad_syms = \
139bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
140[ -z "$$bad_syms" ] || \
141  ( echo "following symbols must have non local/private scope:" >&2; \
142    echo "$$bad_syms" >&2; false )
143
144check_for_multiple_zreladdr = \
145if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
146	echo 'multiple zreladdrs: $(ZRELADDR)'; \
147	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
148	false; \
149fi
150
151efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
152
153$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
154		$(addprefix $(obj)/, $(OBJS)) \
155		$(efi-obj-y) FORCE
156	@$(check_for_multiple_zreladdr)
157	$(call if_changed,ld)
158	@$(check_for_bad_syms)
159
160$(obj)/piggy_data: $(obj)/../Image FORCE
161	$(call if_changed,$(compress-y))
162
163$(obj)/piggy.o: $(obj)/piggy_data
164
165CFLAGS_font.o := -Dstatic=
166AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
167