1 # SPDX-License-Identifier: GPL-2.0
3 # linux/arch/arm/boot/compressed/Makefile
5 # create a compressed vmlinuz image from the original vmlinux
10 AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
12 OBJS += misc.o decompress.o
13 ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
16 FONTC = $(srctree)/lib/fonts/font_acorn_8x8.c
18 # string library code (-Os is enforced to keep it much smaller)
20 CFLAGS_string.o := -Os
22 ifeq ($(CONFIG_ARM_VIRT_EXT),y)
28 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
32 # Architecture dependencies
34 ifeq ($(CONFIG_ARCH_ACORN),y)
35 OBJS += ll_char_wr.o font.o
38 ifeq ($(CONFIG_ARCH_SA1100),y)
42 ifeq ($(CONFIG_CPU_XSCALE),y)
46 ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
47 OBJS += head-sharpsl.o
50 ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
51 ifeq ($(CONFIG_CPU_CP15),y)
54 # The endian should be set by h/w design.
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
63 ifeq ($(CONFIG_ZBOOT_ROM),y)
64 ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT)
65 ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS)
71 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
73 compress-$(CONFIG_KERNEL_GZIP) = gzip
74 compress-$(CONFIG_KERNEL_LZO) = lzo
75 compress-$(CONFIG_KERNEL_LZMA) = lzma
76 compress-$(CONFIG_KERNEL_XZ) = xzkern
77 compress-$(CONFIG_KERNEL_LZ4) = lz4
79 # Borrowed libfdt files for the ATAG compatibility mode
81 libfdt := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c
82 libfdt_hdrs := fdt.h libfdt.h libfdt_internal.h
84 libfdt_objs := $(addsuffix .o, $(basename $(libfdt)))
86 $(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
89 $(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \
90 $(addprefix $(obj)/,$(libfdt_hdrs))
92 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
93 CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN}
94 CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280
95 OBJS += $(libfdt_objs) atags_to_fdt.o
98 targets := vmlinux vmlinux.lds piggy_data piggy.o \
99 lib1funcs.o ashldi3.o bswapsdi2.o \
102 clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S \
103 $(libfdt) $(libfdt_hdrs) hyp-stub.S
105 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
107 ifeq ($(CONFIG_FUNCTION_TRACER),y)
108 ORIG_CFLAGS := $(KBUILD_CFLAGS)
109 KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
112 # -fstack-protector-strong triggers protection checks in this code,
113 # but it is being used too early to link to meaningful stack_chk logic.
114 nossp_flags := $(call cc-option, -fno-stack-protector)
115 CFLAGS_atags_to_fdt.o := $(nossp_flags)
116 CFLAGS_fdt.o := $(nossp_flags)
117 CFLAGS_fdt_ro.o := $(nossp_flags)
118 CFLAGS_fdt_rw.o := $(nossp_flags)
119 CFLAGS_fdt_wip.o := $(nossp_flags)
121 ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
122 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
123 asflags-y := -DZIMAGE
125 # Supply kernel BSS size to the decompressor via a linker symbol.
126 KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
127 sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \
128 -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) )
129 LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
130 # Supply ZRELADDR to the decompressor via a linker symbol.
131 ifneq ($(CONFIG_AUTO_ZRELADDR),y)
132 LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
134 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
135 LDFLAGS_vmlinux += --be8
137 # Report unresolved symbol references
138 LDFLAGS_vmlinux += --no-undefined
139 # Delete all temporary local symbols
140 LDFLAGS_vmlinux += -X
141 # Next argument is a linker script
142 LDFLAGS_vmlinux += -T
144 # For __aeabi_uidivmod
145 lib1funcs = $(obj)/lib1funcs.o
147 $(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
151 ashldi3 = $(obj)/ashldi3.o
153 $(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
156 # For __bswapsi2, __bswapdi2
157 bswapsdi2 = $(obj)/bswapsdi2.o
159 $(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
162 # We need to prevent any GOTOFF relocs being used with references
163 # to symbols in the .bss section since we cannot relocate them
164 # independently from the rest at run time. This can be achieved by
165 # ensuring that no private .bss symbols exist, as global symbols
166 # always have a GOT entry which is what we need.
167 # The .data section is already discarded by the linker script so no need
168 # to bother about it here.
169 check_for_bad_syms = \
170 bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
171 [ -z "$$bad_syms" ] || \
172 ( echo "following symbols must have non local/private scope:" >&2; \
173 echo "$$bad_syms" >&2; false )
175 check_for_multiple_zreladdr = \
176 if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
177 echo 'multiple zreladdrs: $(ZRELADDR)'; \
178 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
182 efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
184 $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
185 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
186 $(bswapsdi2) $(efi-obj-y) FORCE
187 @$(check_for_multiple_zreladdr)
188 $(call if_changed,ld)
189 @$(check_for_bad_syms)
191 $(obj)/piggy_data: $(obj)/../Image FORCE
192 $(call if_changed,$(compress-y))
194 $(obj)/piggy.o: $(obj)/piggy_data
196 CFLAGS_font.o := -Dstatic=
198 $(obj)/font.c: $(FONTC)
201 AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
203 $(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S