Makefile

  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
 44ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
 45ifeq ($(CONFIG_CPU_CP15),y)
 46OBJS		+= big-endian.o
 47else
 48# The endian should be set by h/w design.
 49endif
 50endif
 51
 52#
 53# We now have a PIC decompressor implementation.  Decompressors running
 54# from RAM should not define ZTEXTADDR.  Decompressors running directly
 55# from ROM or Flash must define ZTEXTADDR (preferably via the config)
 56# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
 57ifeq ($(CONFIG_ZBOOT_ROM),y)
 58ZTEXTADDR	:= $(CONFIG_ZBOOT_ROM_TEXT)
 59ZBSSADDR	:= $(CONFIG_ZBOOT_ROM_BSS)
 60else
 61ZTEXTADDR	:= 0
 62ZBSSADDR	:= ALIGN(8)
 63endif
 64
 65MALLOC_SIZE	:= 65536
 66
 67AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
 68CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
 69CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
 70CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
 71
 72compress-$(CONFIG_KERNEL_GZIP) = gzip
 73compress-$(CONFIG_KERNEL_LZO)  = lzo_with_size
 74compress-$(CONFIG_KERNEL_LZMA) = lzma_with_size
 75compress-$(CONFIG_KERNEL_XZ)   = xzkern_with_size
 76compress-$(CONFIG_KERNEL_LZ4)  = lz4_with_size
 77
 78libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
 79
 80ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
 81CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN}
 82CFLAGS_atags_to_fdt.o += -Wframe-larger-than=1280
 83OBJS	+= $(libfdt_objs) atags_to_fdt.o
 84endif
 85ifeq ($(CONFIG_USE_OF),y)
 86OBJS	+= $(libfdt_objs) fdt_check_mem_start.o
 87endif
 88
 89OBJS	+= lib1funcs.o ashldi3.o bswapsdi2.o
 90
 91targets       := vmlinux vmlinux.lds piggy_data piggy.o \
 92		 head.o $(OBJS)
 93
 94KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 95
 96ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
 97	     -I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \
 98	     $(DISABLE_KSTACK_ERASE) \
 99	     -I$(obj)
100ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
101asflags-y := -DZIMAGE
102
103# Supply kernel BSS size to the decompressor via a linker symbol.
104KBSS_SZ = $(shell echo $$(($$($(NM) vmlinux | \
105		sed -n -e 's/^\([^ ]*\) [ABD] __bss_start$$/-0x\1/p' \
106		       -e 's/^\([^ ]*\) [ABD] __bss_stop$$/+0x\1/p') )) )
107LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
108# Supply ZRELADDR to the decompressor via a linker symbol.
109ifneq ($(CONFIG_AUTO_ZRELADDR),y)
110LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
111endif
112ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
113LDFLAGS_vmlinux += --be8
114endif
115# Report unresolved symbol references
116LDFLAGS_vmlinux += --no-undefined
117# Delete all temporary local symbols
118LDFLAGS_vmlinux += -X
119# Report orphan sections
120ifdef CONFIG_LD_ORPHAN_WARN
121LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
122endif
123# Next argument is a linker script
124LDFLAGS_vmlinux += -T
125
126# We need to prevent any GOTOFF relocs being used with references
127# to symbols in the .bss section since we cannot relocate them
128# independently from the rest at run time.  This can be achieved by
129# ensuring that no private .bss symbols exist, as global symbols
130# always have a GOT entry which is what we need.
131# The .data section is already discarded by the linker script so no need
132# to bother about it here.
133check_for_bad_syms = \
134bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
135[ -z "$$bad_syms" ] || \
136  ( echo "following symbols must have non local/private scope:" >&2; \
137    echo "$$bad_syms" >&2; false )
138
139check_for_multiple_zreladdr = \
140if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
141	echo 'multiple zreladdrs: $(ZRELADDR)'; \
142	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
143	false; \
144fi
145
146efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
147
148$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
149		$(addprefix $(obj)/, $(OBJS)) \
150		$(efi-obj-y) FORCE
151	@$(check_for_multiple_zreladdr)
152	$(call if_changed,ld)
153	@$(check_for_bad_syms)
154
155$(obj)/piggy_data: $(obj)/../Image FORCE
156	$(call if_changed,$(compress-y))
157
158$(obj)/piggy.o: $(obj)/piggy_data
159
160CFLAGS_font.o := -Dstatic=