mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-21 18:11:39 +00:00
5de813b6cd
We used to build decompressors with -Dstatic= to avoid any local data being generated. The problem is that local data generates GOTOFF relocations, which means we can't relocate the data relative to the text segment. Global data, on the other hand, goes through the GOT, and can be relocated anywhere. Unfortunately, with the new decompressors, this presents a problem since they declare static data within functions, and this leads to stack overflow. Fix this by separating out the decompressor code into a separate file, and removing 'static' from BSS data in misc.c. Also, discard the .data section - this means that should we end up with read/write initialized data, the decompressor will fail to link and the problem will be obvious. Acked-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
125 lines
3 KiB
Makefile
125 lines
3 KiB
Makefile
#
|
|
# linux/arch/arm/boot/compressed/Makefile
|
|
#
|
|
# create a compressed vmlinuz image from the original vmlinux
|
|
#
|
|
|
|
HEAD = head.o
|
|
OBJS = misc.o decompress.o
|
|
FONTC = $(srctree)/drivers/video/console/font_acorn_8x8.c
|
|
|
|
#
|
|
# Architecture dependencies
|
|
#
|
|
ifeq ($(CONFIG_ARCH_ACORN),y)
|
|
OBJS += ll_char_wr.o font.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_ARCH_SHARK),y)
|
|
OBJS += head-shark.o ofw-shark.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_ARCH_L7200),y)
|
|
OBJS += head-l7200.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_ARCH_P720T),y)
|
|
# Borrow this code from SA1100
|
|
OBJS += head-sa1100.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_ARCH_SA1100),y)
|
|
OBJS += head-sa1100.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_CPU_XSCALE),y)
|
|
OBJS += head-xscale.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_PXA_SHARPSL),y)
|
|
OBJS += head-sharpsl.o
|
|
endif
|
|
|
|
ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
|
|
ifeq ($(CONFIG_CPU_CP15),y)
|
|
OBJS += big-endian.o
|
|
else
|
|
# The endian should be set by h/w design.
|
|
endif
|
|
endif
|
|
|
|
#
|
|
# We now have a PIC decompressor implementation. Decompressors running
|
|
# from RAM should not define ZTEXTADDR. Decompressors running directly
|
|
# from ROM or Flash must define ZTEXTADDR (preferably via the config)
|
|
# FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
|
|
ifeq ($(CONFIG_ZBOOT_ROM),y)
|
|
ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT)
|
|
ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS)
|
|
else
|
|
ZTEXTADDR := 0
|
|
ZBSSADDR := ALIGN(4)
|
|
endif
|
|
|
|
SEDFLAGS = s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
|
|
|
|
suffix_$(CONFIG_KERNEL_GZIP) = gzip
|
|
suffix_$(CONFIG_KERNEL_LZO) = lzo
|
|
|
|
targets := vmlinux vmlinux.lds \
|
|
piggy.$(suffix_y) piggy.$(suffix_y).o \
|
|
font.o font.c head.o misc.o $(OBJS)
|
|
|
|
ifeq ($(CONFIG_FUNCTION_TRACER),y)
|
|
ORIG_CFLAGS := $(KBUILD_CFLAGS)
|
|
KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
|
|
endif
|
|
|
|
EXTRA_CFLAGS := -fpic -fno-builtin
|
|
EXTRA_AFLAGS := -Wa,-march=all
|
|
|
|
# Supply ZRELADDR, INITRD_PHYS and PARAMS_PHYS to the decompressor via
|
|
# linker symbols. We only define initrd_phys and params_phys if the
|
|
# machine class defined the corresponding makefile variable.
|
|
LDFLAGS_vmlinux := --defsym zreladdr=$(ZRELADDR)
|
|
ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
|
|
LDFLAGS_vmlinux += --be8
|
|
endif
|
|
ifneq ($(INITRD_PHYS),)
|
|
LDFLAGS_vmlinux += --defsym initrd_phys=$(INITRD_PHYS)
|
|
endif
|
|
ifneq ($(PARAMS_PHYS),)
|
|
LDFLAGS_vmlinux += --defsym params_phys=$(PARAMS_PHYS)
|
|
endif
|
|
# ?
|
|
LDFLAGS_vmlinux += -p
|
|
# Report unresolved symbol references
|
|
LDFLAGS_vmlinux += --no-undefined
|
|
# Delete all temporary local symbols
|
|
LDFLAGS_vmlinux += -X
|
|
# Next argument is a linker script
|
|
LDFLAGS_vmlinux += -T
|
|
|
|
# For __aeabi_uidivmod
|
|
lib1funcs = $(obj)/lib1funcs.o
|
|
|
|
$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S FORCE
|
|
$(call cmd,shipped)
|
|
|
|
$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
|
|
$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) FORCE
|
|
$(call if_changed,ld)
|
|
@:
|
|
|
|
$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
|
|
$(call if_changed,$(suffix_y))
|
|
|
|
$(obj)/piggy.$(suffix_y).o: $(obj)/piggy.$(suffix_y) FORCE
|
|
|
|
CFLAGS_font.o := -Dstatic=
|
|
|
|
$(obj)/font.c: $(FONTC)
|
|
$(call cmd,shipped)
|
|
|
|
$(obj)/vmlinux.lds: $(obj)/vmlinux.lds.in arch/arm/boot/Makefile .config
|
|
@sed "$(SEDFLAGS)" < $< > $@
|