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 25# 26# Architecture dependencies 27# 28ifeq ($(CONFIG_ARCH_ACORN),y) 29OBJS += ll_char_wr.o font.o 30endif 31 32ifeq ($(CONFIG_ARCH_SA1100),y) 33OBJS += head-sa1100.o 34endif 35 36ifeq ($(CONFIG_CPU_XSCALE),y) 37OBJS += head-xscale.o 38endif 39 40ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y) 41OBJS += head-sharpsl.o 42endif 43 44# 45# We now have a PIC decompressor implementation. Decompressors running 46# from RAM should not define ZTEXTADDR. Decompressors running directly 47# from ROM or Flash must define ZTEXTADDR (preferably via the config) 48# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK 49ifeq ($(CONFIG_ZBOOT_ROM),y) 50ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT) 51ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS) 52else 53ZTEXTADDR := 0 54ZBSSADDR := ALIGN(8) 55endif 56 57MALLOC_SIZE := 65536 58 59AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE) 60CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)" 61CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)" 62CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)" 63 64compress-$(CONFIG_KERNEL_GZIP) = gzip 65compress-$(CONFIG_KERNEL_LZO) = lzo_with_size 66compress-$(CONFIG_KERNEL_LZMA) = lzma_with_size 67compress-$(CONFIG_KERNEL_XZ) = xzkern_with_size 68compress-$(CONFIG_KERNEL_LZ4) = lz4_with_size 69 70libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o 71 72ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) 73CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN} 74CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280 75OBJS += $(libfdt_objs) atags_to_fdt.o 76endif 77ifeq ($(CONFIG_USE_OF),y) 78OBJS += $(libfdt_objs) fdt_check_mem_start.o 79endif 80 81OBJS += lib1funcs.o ashldi3.o bswapsdi2.o 82 83targets := vmlinux vmlinux.lds piggy_data piggy.o \ 84 head.o $(OBJS) 85 86KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 87 88ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \ 89 -I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \ 90 $(DISABLE_KSTACK_ERASE) \ 91 -I$(obj) 92ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg 93asflags-y := -DZIMAGE 94 95# Supply kernel BSS size to the decompressor via a linker symbol. 96KBSS_SZ = $(shell echo $$(($$($(NM) vmlinux | \ 97 sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \ 98 -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) ) 99LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ) 100# Supply ZRELADDR to the decompressor via a linker symbol. 101ifneq ($(CONFIG_AUTO_ZRELADDR),y) 102LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) 103endif 104ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) 105LDFLAGS_vmlinux += --be8 106endif 107# Report unresolved symbol references 108LDFLAGS_vmlinux += --no-undefined 109# Delete all temporary local symbols 110LDFLAGS_vmlinux += -X 111# Report orphan sections 112ifdef CONFIG_LD_ORPHAN_WARN 113LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 114endif 115# Next argument is a linker script 116LDFLAGS_vmlinux += -T 117 118# We need to prevent any GOTOFF relocs being used with references 119# to symbols in the .bss section since we cannot relocate them 120# independently from the rest at run time. This can be achieved by 121# ensuring that no private .bss symbols exist, as global symbols 122# always have a GOT entry which is what we need. 123# The .data section is already discarded by the linker script so no need 124# to bother about it here. 125check_for_bad_syms = \ 126bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \ 127[ -z "$$bad_syms" ] || \ 128 ( echo "following symbols must have non local/private scope:" >&2; \ 129 echo "$$bad_syms" >&2; false ) 130 131check_for_multiple_zreladdr = \ 132if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ 133 echo 'multiple zreladdrs: $(ZRELADDR)'; \ 134 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \ 135 false; \ 136fi 137 138efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a 139 140$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \ 141 $(addprefix $(obj)/, $(OBJS)) \ 142 $(efi-obj-y) FORCE 143 @$(check_for_multiple_zreladdr) 144 $(call if_changed,ld) 145 @$(check_for_bad_syms) 146 147$(obj)/piggy_data: $(obj)/../Image FORCE 148 +$(call if_changed,$(compress-y)) 149 150$(obj)/piggy.o: $(obj)/piggy_data 151 152CFLAGS_font.o := -DBOOTLOADER 153