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 16FONTC = $(srctree)/lib/fonts/font_acorn_8x8.c 17 18# string library code (-Os is enforced to keep it much smaller) 19OBJS += string.o 20CFLAGS_string.o := -Os 21 22ifeq ($(CONFIG_ARM_VIRT_EXT),y) 23OBJS += hyp-stub.o 24endif 25 26GCOV_PROFILE := 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-$(CONFIG_KERNEL_LZO) = lzo 80compress-$(CONFIG_KERNEL_LZMA) = lzma 81compress-$(CONFIG_KERNEL_XZ) = xzkern 82compress-$(CONFIG_KERNEL_LZ4) = lz4 83 84libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o 85 86ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) 87OBJS += $(libfdt_objs) atags_to_fdt.o 88endif 89 90# -fstack-protector-strong triggers protection checks in this code, 91# but it is being used too early to link to meaningful stack_chk logic. 92$(foreach o, $(libfdt_objs) atags_to_fdt.o, \ 93 $(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector)) 94 95# These were previously generated C files. When you are building the kernel 96# with O=, make sure to remove the stale files in the output tree. Otherwise, 97# the build system wrongly compiles the stale ones. 98ifdef building_out_of_srctree 99$(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c)) 100endif 101 102targets := vmlinux vmlinux.lds piggy_data piggy.o \ 103 lib1funcs.o ashldi3.o bswapsdi2.o \ 104 head.o $(OBJS) 105 106clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S 107 108KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 109 110ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \ 111 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN) 112ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg 113asflags-y := -DZIMAGE 114 115# Supply kernel BSS size to the decompressor via a linker symbol. 116KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \ 117 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \ 118 -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) ) 119LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ) 120# Supply ZRELADDR to the decompressor via a linker symbol. 121ifneq ($(CONFIG_AUTO_ZRELADDR),y) 122LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) 123endif 124ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) 125LDFLAGS_vmlinux += --be8 126endif 127# Report unresolved symbol references 128LDFLAGS_vmlinux += --no-undefined 129# Delete all temporary local symbols 130LDFLAGS_vmlinux += -X 131# Report orphan sections 132LDFLAGS_vmlinux += $(call ld-option, --orphan-handling=warn) 133# Next argument is a linker script 134LDFLAGS_vmlinux += -T 135 136# For __aeabi_uidivmod 137lib1funcs = $(obj)/lib1funcs.o 138 139$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S 140 $(call cmd,shipped) 141 142# For __aeabi_llsl 143ashldi3 = $(obj)/ashldi3.o 144 145$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S 146 $(call cmd,shipped) 147 148# For __bswapsi2, __bswapdi2 149bswapsdi2 = $(obj)/bswapsdi2.o 150 151$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S 152 $(call cmd,shipped) 153 154# We need to prevent any GOTOFF relocs being used with references 155# to symbols in the .bss section since we cannot relocate them 156# independently from the rest at run time. This can be achieved by 157# ensuring that no private .bss symbols exist, as global symbols 158# always have a GOT entry which is what we need. 159# The .data section is already discarded by the linker script so no need 160# to bother about it here. 161check_for_bad_syms = \ 162bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \ 163[ -z "$$bad_syms" ] || \ 164 ( echo "following symbols must have non local/private scope:" >&2; \ 165 echo "$$bad_syms" >&2; false ) 166 167check_for_multiple_zreladdr = \ 168if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ 169 echo 'multiple zreladdrs: $(ZRELADDR)'; \ 170 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \ 171 false; \ 172fi 173 174efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a 175 176$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \ 177 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \ 178 $(bswapsdi2) $(efi-obj-y) FORCE 179 @$(check_for_multiple_zreladdr) 180 $(call if_changed,ld) 181 @$(check_for_bad_syms) 182 183$(obj)/piggy_data: $(obj)/../Image FORCE 184 $(call if_changed,$(compress-y)) 185 186$(obj)/piggy.o: $(obj)/piggy_data 187 188CFLAGS_font.o := -Dstatic= 189 190$(obj)/font.c: $(FONTC) 191 $(call cmd,shipped) 192 193AFLAGS_hyp-stub.o := -Wa,-march=armv7-a 194 195$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S 196 $(call cmd,shipped) 197