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# 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 := $(CONFIG_ZBOOT_ROM_BSS) 66else 67ZTEXTADDR := 0 68ZBSSADDR := ALIGN(8) 69endif 70 71CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)" 72 73compress-$(CONFIG_KERNEL_GZIP) = gzip 74compress-$(CONFIG_KERNEL_LZO) = lzo 75compress-$(CONFIG_KERNEL_LZMA) = lzma 76compress-$(CONFIG_KERNEL_XZ) = xzkern 77compress-$(CONFIG_KERNEL_LZ4) = lz4 78 79libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o 80 81ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) 82OBJS += $(libfdt_objs) atags_to_fdt.o 83endif 84 85# -fstack-protector-strong triggers protection checks in this code, 86# but it is being used too early to link to meaningful stack_chk logic. 87$(foreach o, $(libfdt_objs) atags_to_fdt.o, \ 88 $(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector)) 89 90# These were previously generated C files. When you are building the kernel 91# with O=, make sure to remove the stale files in the output tree. Otherwise, 92# the build system wrongly compiles the stale ones. 93ifdef building_out_of_srctree 94$(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c)) 95endif 96 97targets := vmlinux vmlinux.lds piggy_data piggy.o \ 98 lib1funcs.o ashldi3.o bswapsdi2.o \ 99 head.o $(OBJS) 100 101clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S 102 103KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING 104 105ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \ 106 -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN) 107ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg 108asflags-y := -DZIMAGE 109 110# Supply kernel BSS size to the decompressor via a linker symbol. 111KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \ 112 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \ 113 -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) ) 114LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ) 115# Supply ZRELADDR to the decompressor via a linker symbol. 116ifneq ($(CONFIG_AUTO_ZRELADDR),y) 117LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) 118endif 119ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) 120LDFLAGS_vmlinux += --be8 121endif 122# Report unresolved symbol references 123LDFLAGS_vmlinux += --no-undefined 124# Delete all temporary local symbols 125LDFLAGS_vmlinux += -X 126# Next argument is a linker script 127LDFLAGS_vmlinux += -T 128 129# For __aeabi_uidivmod 130lib1funcs = $(obj)/lib1funcs.o 131 132$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S 133 $(call cmd,shipped) 134 135# For __aeabi_llsl 136ashldi3 = $(obj)/ashldi3.o 137 138$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S 139 $(call cmd,shipped) 140 141# For __bswapsi2, __bswapdi2 142bswapsdi2 = $(obj)/bswapsdi2.o 143 144$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S 145 $(call cmd,shipped) 146 147# We need to prevent any GOTOFF relocs being used with references 148# to symbols in the .bss section since we cannot relocate them 149# independently from the rest at run time. This can be achieved by 150# ensuring that no private .bss symbols exist, as global symbols 151# always have a GOT entry which is what we need. 152# The .data section is already discarded by the linker script so no need 153# to bother about it here. 154check_for_bad_syms = \ 155bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \ 156[ -z "$$bad_syms" ] || \ 157 ( echo "following symbols must have non local/private scope:" >&2; \ 158 echo "$$bad_syms" >&2; false ) 159 160check_for_multiple_zreladdr = \ 161if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \ 162 echo 'multiple zreladdrs: $(ZRELADDR)'; \ 163 echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \ 164 false; \ 165fi 166 167efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a 168 169$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \ 170 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \ 171 $(bswapsdi2) $(efi-obj-y) FORCE 172 @$(check_for_multiple_zreladdr) 173 $(call if_changed,ld) 174 @$(check_for_bad_syms) 175 176$(obj)/piggy_data: $(obj)/../Image FORCE 177 $(call if_changed,$(compress-y)) 178 179$(obj)/piggy.o: $(obj)/piggy_data 180 181CFLAGS_font.o := -Dstatic= 182 183$(obj)/font.c: $(FONTC) 184 $(call cmd,shipped) 185 186AFLAGS_hyp-stub.o := -Wa,-march=armv7-a 187 188$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S 189 $(call cmd,shipped) 190