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 10AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) 11HEAD = head.o 12OBJS += misc.o decompress.o 13ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y) 14OBJS += debug.o 15AFLAGS_head.o += -DDEBUG 16endif 17FONTC = $(srctree)/lib/fonts/font_acorn_8x8.c 18 19# string library code (-Os is enforced to keep it much smaller) 20OBJS += string.o 21CFLAGS_string.o := -Os 22 23ifeq ($(CONFIG_ARM_VIRT_EXT),y) 24OBJS += hyp-stub.o 25endif 26 27GCOV_PROFILE := 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 := $(CONFIG_ZBOOT_ROM_BSS) 67else 68ZTEXTADDR := 0 69ZBSSADDR := ALIGN(8) 70endif 71 72CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)" 73 74compress-$(CONFIG_KERNEL_GZIP) = gzip 75compress-$(CONFIG_KERNEL_LZO) = lzo 76compress-$(CONFIG_KERNEL_LZMA) = lzma 77compress-$(CONFIG_KERNEL_XZ) = xzkern 78compress-$(CONFIG_KERNEL_LZ4) = lz4 79 80libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o 81 82ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) 83OBJS += $(libfdt_objs) atags_to_fdt.o 84endif 85 86# -fstack-protector-strong triggers protection checks in this code, 87# but it is being used too early to link to meaningful stack_chk logic. 88$(foreach o, $(libfdt_objs) atags_to_fdt.o, \ 89 $(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector)) 90 91# These were previously generated C files. When you are building the kernel 92# with O=, make sure to remove the stale files in the output tree. Otherwise, 93# the build system wrongly compiles the stale ones. 94ifdef building_out_of_srctree 95$(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c)) 96endif 97 98targets := vmlinux vmlinux.lds piggy_data piggy.o \ 99 lib1funcs.o ashldi3.o bswapsdi2.o \ 100 head.o $(OBJS) 101 102clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S 103 104KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 105 106ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \ 107 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN) 108ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg 109asflags-y := -DZIMAGE 110 111# Supply kernel BSS size to the decompressor via a linker symbol. 112KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \ 113 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \ 114 -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) ) 115LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ) 116# Supply ZRELADDR to the decompressor via a linker symbol. 117ifneq ($(CONFIG_AUTO_ZRELADDR),y) 118LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) 119endif 120ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) 121LDFLAGS_vmlinux += --be8 122endif 123# Report unresolved symbol references 124LDFLAGS_vmlinux += --no-undefined 125# Delete all temporary local symbols 126LDFLAGS_vmlinux += -X 127# Next argument is a linker script 128LDFLAGS_vmlinux += -T 129 130# For __aeabi_uidivmod 131lib1funcs = $(obj)/lib1funcs.o 132 133$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S 134 $(call cmd,shipped) 135 136# For __aeabi_llsl 137ashldi3 = $(obj)/ashldi3.o 138 139$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S 140 $(call cmd,shipped) 141 142# For __bswapsi2, __bswapdi2 143bswapsdi2 = $(obj)/bswapsdi2.o 144 145$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S 146 $(call cmd,shipped) 147 148# We need to prevent any GOTOFF relocs being used with references 149# to symbols in the .bss section since we cannot relocate them 150# independently from the rest at run time. This can be achieved by 151# ensuring that no private .bss symbols exist, as global symbols 152# always have a GOT entry which is what we need. 153# The .data section is already discarded by the linker script so no need 154# to bother about it here. 155check_for_bad_syms = \ 156bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \ 157[ -z "$$bad_syms" ] || \ 158 ( echo "following symbols must have non local/private scope:" >&2; \ 159 echo "$$bad_syms" >&2; false ) 160 161check_for_multiple_zreladdr = \ 162if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ 163 echo 'multiple zreladdrs: $(ZRELADDR)'; \ 164 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \ 165 false; \ 166fi 167 168efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a 169 170$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \ 171 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \ 172 $(bswapsdi2) $(efi-obj-y) FORCE 173 @$(check_for_multiple_zreladdr) 174 $(call if_changed,ld) 175 @$(check_for_bad_syms) 176 177$(obj)/piggy_data: $(obj)/../Image FORCE 178 $(call if_changed,$(compress-y)) 179 180$(obj)/piggy.o: $(obj)/piggy_data 181 182CFLAGS_font.o := -Dstatic= 183 184$(obj)/font.c: $(FONTC) 185 $(call cmd,shipped) 186 187AFLAGS_hyp-stub.o := -Wa,-march=armv7-a 188 189$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S 190 $(call cmd,shipped) 191