1 # SPDX-License-Identifier: GPL-2.0
3 # linux/arch/arm/boot/compressed/Makefile
5 # create a compressed vmlinuz image from the original vmlinux
11 OBJS += misc.o decompress.o
12 ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
14 AFLAGS_head.o += -DDEBUG
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)
29 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
33 # Architecture dependencies
35 ifeq ($(CONFIG_ARCH_ACORN),y)
36 OBJS += ll_char_wr.o font.o
39 ifeq ($(CONFIG_ARCH_SA1100),y)
43 ifeq ($(CONFIG_CPU_XSCALE),y)
47 ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
48 OBJS += head-sharpsl.o
51 ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
52 ifeq ($(CONFIG_CPU_CP15),y)
55 # The endian should be set by h/w design.
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
64 ifeq ($(CONFIG_ZBOOT_ROM),y)
65 ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT)
66 ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS)
74 AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
75 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
76 CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
77 CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
79 compress-$(CONFIG_KERNEL_GZIP) = gzip
80 compress-$(CONFIG_KERNEL_LZO) = lzo
81 compress-$(CONFIG_KERNEL_LZMA) = lzma
82 compress-$(CONFIG_KERNEL_XZ) = xzkern
83 compress-$(CONFIG_KERNEL_LZ4) = lz4
85 libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
87 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
88 CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN}
89 CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280
90 OBJS += $(libfdt_objs) atags_to_fdt.o
92 ifeq ($(CONFIG_USE_OF),y)
93 OBJS += $(libfdt_objs) fdt_check_mem_start.o
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))
101 targets := vmlinux vmlinux.lds piggy_data piggy.o \
102 lib1funcs.o ashldi3.o bswapsdi2.o \
105 clean-files += lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S
107 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
109 ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
110 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
111 ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
112 asflags-y := -DZIMAGE
114 # Supply kernel BSS size to the decompressor via a linker symbol.
115 KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
116 sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \
117 -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) )
118 LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
119 # Supply ZRELADDR to the decompressor via a linker symbol.
120 ifneq ($(CONFIG_AUTO_ZRELADDR),y)
121 LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
123 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
124 LDFLAGS_vmlinux += --be8
126 # Report unresolved symbol references
127 LDFLAGS_vmlinux += --no-undefined
128 # Delete all temporary local symbols
129 LDFLAGS_vmlinux += -X
130 # Report orphan sections
131 ifdef CONFIG_LD_ORPHAN_WARN
132 LDFLAGS_vmlinux += --orphan-handling=warn
134 # Next argument is a linker script
135 LDFLAGS_vmlinux += -T
137 # For __aeabi_uidivmod
138 lib1funcs = $(obj)/lib1funcs.o
140 $(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
144 ashldi3 = $(obj)/ashldi3.o
146 $(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
149 # For __bswapsi2, __bswapdi2
150 bswapsdi2 = $(obj)/bswapsdi2.o
152 $(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
155 # We need to prevent any GOTOFF relocs being used with references
156 # to symbols in the .bss section since we cannot relocate them
157 # independently from the rest at run time. This can be achieved by
158 # ensuring that no private .bss symbols exist, as global symbols
159 # always have a GOT entry which is what we need.
160 # The .data section is already discarded by the linker script so no need
161 # to bother about it here.
162 check_for_bad_syms = \
163 bad_syms=$$($(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 )
168 check_for_multiple_zreladdr = \
169 if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
170 echo 'multiple zreladdrs: $(ZRELADDR)'; \
171 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
175 efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
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)
184 $(obj)/piggy_data: $(obj)/../Image FORCE
185 $(call if_changed,$(compress-y))
187 $(obj)/piggy.o: $(obj)/piggy_data
189 CFLAGS_font.o := -Dstatic=
191 $(obj)/font.c: $(FONTC)
194 AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
196 $(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S