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 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# 29# Architecture dependencies 30# 31ifeq ($(CONFIG_ARCH_ACORN),y) 32OBJS += ll_char_wr.o font.o 33endif 34 35ifeq ($(CONFIG_ARCH_SA1100),y) 36OBJS += head-sa1100.o 37endif 38 39ifeq ($(CONFIG_CPU_XSCALE),y) 40OBJS += head-xscale.o 41endif 42 43ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y) 44OBJS += head-sharpsl.o 45endif 46 47ifeq ($(CONFIG_CPU_ENDIAN_BE32),y) 48ifeq ($(CONFIG_CPU_CP15),y) 49OBJS += big-endian.o 50else 51# The endian should be set by h/w design. 52endif 53endif 54 55# 56# We now have a PIC decompressor implementation. Decompressors running 57# from RAM should not define ZTEXTADDR. Decompressors running directly 58# from ROM or Flash must define ZTEXTADDR (preferably via the config) 59# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK 60ifeq ($(CONFIG_ZBOOT_ROM),y) 61ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT) 62ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS) 63else 64ZTEXTADDR := 0 65ZBSSADDR := ALIGN(8) 66endif 67 68CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)" 69 70compress-$(CONFIG_KERNEL_GZIP) = gzip 71compress-$(CONFIG_KERNEL_LZO) = lzo 72compress-$(CONFIG_KERNEL_LZMA) = lzma 73compress-$(CONFIG_KERNEL_XZ) = xzkern 74compress-$(CONFIG_KERNEL_LZ4) = lz4 75 76# Borrowed libfdt files for the ATAG compatibility mode 77 78libfdt := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c 79libfdt_hdrs := fdt.h libfdt.h libfdt_internal.h 80 81libfdt_objs := $(addsuffix .o, $(basename $(libfdt))) 82 83$(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/% 84 $(call cmd,shipped) 85 86$(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \ 87 $(addprefix $(obj)/,$(libfdt_hdrs)) 88 89ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) 90OBJS += $(libfdt_objs) atags_to_fdt.o 91endif 92 93targets := vmlinux vmlinux.lds piggy_data piggy.o \ 94 lib1funcs.o ashldi3.o bswapsdi2.o \ 95 head.o $(OBJS) 96 97clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S \ 98 $(libfdt) $(libfdt_hdrs) hyp-stub.S 99 100KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 101 102ifeq ($(CONFIG_FUNCTION_TRACER),y) 103ORIG_CFLAGS := $(KBUILD_CFLAGS) 104KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS)) 105endif 106 107# -fstack-protector-strong triggers protection checks in this code, 108# but it is being used too early to link to meaningful stack_chk logic. 109nossp_flags := $(call cc-option, -fno-stack-protector) 110CFLAGS_atags_to_fdt.o := $(nossp_flags) 111CFLAGS_fdt.o := $(nossp_flags) 112CFLAGS_fdt_ro.o := $(nossp_flags) 113CFLAGS_fdt_rw.o := $(nossp_flags) 114CFLAGS_fdt_wip.o := $(nossp_flags) 115 116ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj) 117asflags-y := -DZIMAGE 118 119# Supply kernel BSS size to the decompressor via a linker symbol. 120KBSS_SZ = $(shell echo $$(($$($(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \ 121 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \ 122 -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) ) 123LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ) 124# Supply ZRELADDR to the decompressor via a linker symbol. 125ifneq ($(CONFIG_AUTO_ZRELADDR),y) 126LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) 127endif 128ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) 129LDFLAGS_vmlinux += --be8 130endif 131# ? 132LDFLAGS_vmlinux += -p 133# Report unresolved symbol references 134LDFLAGS_vmlinux += --no-undefined 135# Delete all temporary local symbols 136LDFLAGS_vmlinux += -X 137# Next argument is a linker script 138LDFLAGS_vmlinux += -T 139 140# For __aeabi_uidivmod 141lib1funcs = $(obj)/lib1funcs.o 142 143$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S 144 $(call cmd,shipped) 145 146# For __aeabi_llsl 147ashldi3 = $(obj)/ashldi3.o 148 149$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S 150 $(call cmd,shipped) 151 152# For __bswapsi2, __bswapdi2 153bswapsdi2 = $(obj)/bswapsdi2.o 154 155$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S 156 $(call cmd,shipped) 157 158# We need to prevent any GOTOFF relocs being used with references 159# to symbols in the .bss section since we cannot relocate them 160# independently from the rest at run time. This can be achieved by 161# ensuring that no private .bss symbols exist, as global symbols 162# always have a GOT entry which is what we need. 163# The .data section is already discarded by the linker script so no need 164# to bother about it here. 165check_for_bad_syms = \ 166bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \ 167[ -z "$$bad_syms" ] || \ 168 ( echo "following symbols must have non local/private scope:" >&2; \ 169 echo "$$bad_syms" >&2; rm -f $@; false ) 170 171check_for_multiple_zreladdr = \ 172if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ 173 echo 'multiple zreladdrs: $(ZRELADDR)'; \ 174 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \ 175 false; \ 176fi 177 178efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a 179 180$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \ 181 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \ 182 $(bswapsdi2) $(efi-obj-y) FORCE 183 @$(check_for_multiple_zreladdr) 184 $(call if_changed,ld) 185 @$(check_for_bad_syms) 186 187$(obj)/piggy_data: $(obj)/../Image FORCE 188 $(call if_changed,$(compress-y)) 189 190$(obj)/piggy.o: $(obj)/piggy_data 191 192CFLAGS_font.o := -Dstatic= 193 194$(obj)/font.c: $(FONTC) 195 $(call cmd,shipped) 196 197AFLAGS_hyp-stub.o := -Wa,-march=armv7-a 198 199$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S 200 $(call cmd,shipped) 201