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 ($(CONFIG_DEBUG_UNCOMPRESS),y)
14 AFLAGS_head.o += -DDEBUG
17 # string library code (-Os is enforced to keep it much smaller)
19 CFLAGS_string.o := -Os
21 ifeq ($(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 := $(CONFIG_ZBOOT_ROM_BSS)
73 AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
74 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
75 CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
76 CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
78 compress-$(CONFIG_KERNEL_GZIP) = gzip
79 compress-$(CONFIG_KERNEL_LZO) = lzo
80 compress-$(CONFIG_KERNEL_LZMA) = lzma
81 compress-$(CONFIG_KERNEL_XZ) = xzkern
82 compress-$(CONFIG_KERNEL_LZ4) = lz4
84 libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
86 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
87 CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN}
88 CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280
89 OBJS += $(libfdt_objs) atags_to_fdt.o
91 ifeq ($(CONFIG_USE_OF),y)
92 OBJS += $(libfdt_objs) fdt_check_mem_start.o
95 # -fstack-protector-strong triggers protection checks in this code,
96 # but it is being used too early to link to meaningful stack_chk logic.
97 $(foreach o, $(libfdt_objs) atags_to_fdt.o fdt_check_mem_start.o, \
98 $(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
100 targets := vmlinux vmlinux.lds piggy_data piggy.o \
103 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
105 ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
106 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
107 ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
108 asflags-y := -DZIMAGE
110 # Supply kernel BSS size to the decompressor via a linker symbol.
111 KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
112 sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \
113 -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) )
114 LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
115 # Supply ZRELADDR to the decompressor via a linker symbol.
116 ifneq ($(CONFIG_AUTO_ZRELADDR),y)
117 LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
119 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
120 LDFLAGS_vmlinux += --be8
122 # Report unresolved symbol references
123 LDFLAGS_vmlinux += --no-undefined
124 # Delete all temporary local symbols
125 LDFLAGS_vmlinux += -X
126 # Report orphan sections
127 ifdef CONFIG_LD_ORPHAN_WARN
128 LDFLAGS_vmlinux += --orphan-handling=warn
130 # Next argument is a linker script
131 LDFLAGS_vmlinux += -T
133 OBJS += lib1funcs.o ashldi3.o bswapsdi2.o
135 # We need to prevent any GOTOFF relocs being used with references
136 # to symbols in the .bss section since we cannot relocate them
137 # independently from the rest at run time. This can be achieved by
138 # ensuring that no private .bss symbols exist, as global symbols
139 # always have a GOT entry which is what we need.
140 # The .data section is already discarded by the linker script so no need
141 # to bother about it here.
142 check_for_bad_syms = \
143 bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
144 [ -z "$$bad_syms" ] || \
145 ( echo "following symbols must have non local/private scope:" >&2; \
146 echo "$$bad_syms" >&2; false )
148 check_for_multiple_zreladdr = \
149 if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
150 echo 'multiple zreladdrs: $(ZRELADDR)'; \
151 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
155 efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
157 $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
158 $(addprefix $(obj)/, $(OBJS)) \
160 @$(check_for_multiple_zreladdr)
161 $(call if_changed,ld)
162 @$(check_for_bad_syms)
164 $(obj)/piggy_data: $(obj)/../Image FORCE
165 $(call if_changed,$(compress-y))
167 $(obj)/piggy.o: $(obj)/piggy_data
169 CFLAGS_font.o := -Dstatic=
170 AFLAGS_hyp-stub.o := -Wa,-march=armv7-a