7ae4a78daa
Copying source files during the build time may not end up with as clean code as expected. lib/fdt*.c simply wrap scripts/dtc/libfdt/fdt*.c, and it works nicely. Let's follow this approach for the arm decompressor, too. Add four wrappers, arch/arm/boot/compressed/fdt*.c and remove the Makefile messes. Another nice thing is we no longer need to maintain the own libfdt_env.h because the decompressor can include <linux/libfdt_env.h>. There is a subtle problem when generated files are turned into check-in files. When you are doing a rebuild of an existing object tree with O= option, there exists stale "shipped" copies that the old Makefile implementation created. The build system ends up with compiling the stale generated files because Make searches for prerequisites in the current directory, i.e. $(objtree) first, and then the directory listed in VPATH, i.e. $(srctree). To mend this issue, I added the following code: ifdef building_out_of_srctree $(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c)) endif This will need to stay for a while because "git bisect" crossing this commit, otherwise, would result in a build error. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
195 lines
5.5 KiB
Makefile
195 lines
5.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# linux/arch/arm/boot/compressed/Makefile
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#
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# create a compressed vmlinuz image from the original vmlinux
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#
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OBJS =
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AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
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HEAD = head.o
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OBJS += misc.o decompress.o
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ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
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OBJS += debug.o
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endif
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FONTC = $(srctree)/lib/fonts/font_acorn_8x8.c
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# string library code (-Os is enforced to keep it much smaller)
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OBJS += string.o
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CFLAGS_string.o := -Os
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ifeq ($(CONFIG_ARM_VIRT_EXT),y)
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OBJS += hyp-stub.o
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endif
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GCOV_PROFILE := n
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# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
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KCOV_INSTRUMENT := n
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#
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# Architecture dependencies
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#
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ifeq ($(CONFIG_ARCH_ACORN),y)
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OBJS += ll_char_wr.o font.o
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endif
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ifeq ($(CONFIG_ARCH_SA1100),y)
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OBJS += head-sa1100.o
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endif
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ifeq ($(CONFIG_CPU_XSCALE),y)
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OBJS += head-xscale.o
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endif
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ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
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OBJS += head-sharpsl.o
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endif
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ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
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ifeq ($(CONFIG_CPU_CP15),y)
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OBJS += big-endian.o
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else
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# The endian should be set by h/w design.
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endif
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endif
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#
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# We now have a PIC decompressor implementation. Decompressors running
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# from RAM should not define ZTEXTADDR. Decompressors running directly
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# from ROM or Flash must define ZTEXTADDR (preferably via the config)
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# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
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ifeq ($(CONFIG_ZBOOT_ROM),y)
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ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT)
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ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS)
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else
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ZTEXTADDR := 0
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ZBSSADDR := ALIGN(8)
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endif
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CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
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compress-$(CONFIG_KERNEL_GZIP) = gzip
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compress-$(CONFIG_KERNEL_LZO) = lzo
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compress-$(CONFIG_KERNEL_LZMA) = lzma
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compress-$(CONFIG_KERNEL_XZ) = xzkern
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compress-$(CONFIG_KERNEL_LZ4) = lz4
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libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
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ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
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OBJS += $(libfdt_objs) atags_to_fdt.o
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endif
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# -fstack-protector-strong triggers protection checks in this code,
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# but it is being used too early to link to meaningful stack_chk logic.
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nossp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
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$(foreach o, $(libfdt_objs) atags_to_fdt.o, \
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$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt $(nossp-flags-y)))
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# These were previously generated C files. When you are building the kernel
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# with O=, make sure to remove the stale files in the output tree. Otherwise,
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# the build system wrongly compiles the stale ones.
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ifdef building_out_of_srctree
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$(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c))
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endif
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targets := vmlinux vmlinux.lds piggy_data piggy.o \
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lib1funcs.o ashldi3.o bswapsdi2.o \
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head.o $(OBJS)
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clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
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ifeq ($(CONFIG_FUNCTION_TRACER),y)
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ORIG_CFLAGS := $(KBUILD_CFLAGS)
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KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
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endif
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ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
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-I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
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asflags-y := -DZIMAGE
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# Supply kernel BSS size to the decompressor via a linker symbol.
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KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
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sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
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-e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
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LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
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# Supply ZRELADDR to the decompressor via a linker symbol.
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ifneq ($(CONFIG_AUTO_ZRELADDR),y)
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LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
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endif
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ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
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LDFLAGS_vmlinux += --be8
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endif
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# Report unresolved symbol references
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LDFLAGS_vmlinux += --no-undefined
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# Delete all temporary local symbols
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LDFLAGS_vmlinux += -X
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# Next argument is a linker script
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LDFLAGS_vmlinux += -T
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# For __aeabi_uidivmod
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lib1funcs = $(obj)/lib1funcs.o
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$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
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$(call cmd,shipped)
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# For __aeabi_llsl
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ashldi3 = $(obj)/ashldi3.o
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$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
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$(call cmd,shipped)
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# For __bswapsi2, __bswapdi2
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bswapsdi2 = $(obj)/bswapsdi2.o
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$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
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$(call cmd,shipped)
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# We need to prevent any GOTOFF relocs being used with references
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# to symbols in the .bss section since we cannot relocate them
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# independently from the rest at run time. This can be achieved by
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# ensuring that no private .bss symbols exist, as global symbols
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# always have a GOT entry which is what we need.
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# The .data section is already discarded by the linker script so no need
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# to bother about it here.
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check_for_bad_syms = \
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bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
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[ -z "$$bad_syms" ] || \
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( echo "following symbols must have non local/private scope:" >&2; \
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echo "$$bad_syms" >&2; false )
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check_for_multiple_zreladdr = \
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if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
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echo 'multiple zreladdrs: $(ZRELADDR)'; \
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echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
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false; \
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fi
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efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
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$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
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$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
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$(bswapsdi2) $(efi-obj-y) FORCE
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@$(check_for_multiple_zreladdr)
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$(call if_changed,ld)
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@$(check_for_bad_syms)
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$(obj)/piggy_data: $(obj)/../Image FORCE
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$(call if_changed,$(compress-y))
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$(obj)/piggy.o: $(obj)/piggy_data
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CFLAGS_font.o := -Dstatic=
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$(obj)/font.c: $(FONTC)
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$(call cmd,shipped)
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AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
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$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
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$(call cmd,shipped)
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