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 += $(libfdt_objs) fdt_check_mem_start.o 93endif 94 95# -fstack-protector-strong triggers protection checks in this code, 96# but it is being used too early to link to meaningful stack_chk logic. 97$(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)) 99 100OBJS += lib1funcs.o ashldi3.o bswapsdi2.o 101 102targets := vmlinux vmlinux.lds piggy_data piggy.o \ 103 head.o $(OBJS) 104 105KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 106 107ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \ 108 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN) 109ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg 110asflags-y := -DZIMAGE 111 112# Supply kernel BSS size to the decompressor via a linker symbol. 113KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \ 114 sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \ 115 -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) ) 116LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ) 117# Supply ZRELADDR to the decompressor via a linker symbol. 118ifneq ($(CONFIG_AUTO_ZRELADDR),y) 119LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) 120endif 121ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) 122LDFLAGS_vmlinux += --be8 123endif 124# Report unresolved symbol references 125LDFLAGS_vmlinux += --no-undefined 126# Delete all temporary local symbols 127LDFLAGS_vmlinux += -X 128# Report orphan sections 129ifdef CONFIG_LD_ORPHAN_WARN 130LDFLAGS_vmlinux += --orphan-handling=warn 131endif 132# Next argument is a linker script 133LDFLAGS_vmlinux += -T 134 135# We need to prevent any GOTOFF relocs being used with references 136# to symbols in the .bss section since we cannot relocate them 137# independently from the rest at run time. This can be achieved by 138# ensuring that no private .bss symbols exist, as global symbols 139# always have a GOT entry which is what we need. 140# The .data section is already discarded by the linker script so no need 141# to bother about it here. 142check_for_bad_syms = \ 143bad_syms=$$($(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 ) 147 148check_for_multiple_zreladdr = \ 149if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ 150 echo 'multiple zreladdrs: $(ZRELADDR)'; \ 151 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \ 152 false; \ 153fi 154 155efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a 156 157$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \ 158 $(addprefix $(obj)/, $(OBJS)) \ 159 $(efi-obj-y) FORCE 160 @$(check_for_multiple_zreladdr) 161 $(call if_changed,ld) 162 @$(check_for_bad_syms) 163 164$(obj)/piggy_data: $(obj)/../Image FORCE 165 $(call if_changed,$(compress-y)) 166 167$(obj)/piggy.o: $(obj)/piggy_data 168 169CFLAGS_font.o := -Dstatic= 170AFLAGS_hyp-stub.o := -Wa,-march=armv7-a 171