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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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26e5ca93dd
The code which makes up the zImage header intends to leave a 32-byte gap followed by a branch to the real entry point, a magic number, and a word containing the absolute entry point address. This gets messed up with with CONFIG_THUMB2_KERNEL, because the size of the initial padding NOPs changes. Instead, the header can be made fully compatible by restoring it to ARM. In the Thumb-2 case, we can replace the initial NOPs with a sequence which switches to Thumb and jumps to the real entry point. As a consequence, the zImage entry point is now always ARM, so no special magic is needed any more for the uImage rules in the Thumb-2 case. Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
111 lines
2.9 KiB
Makefile
111 lines
2.9 KiB
Makefile
#
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# arch/arm/boot/Makefile
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1995-2002 Russell King
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#
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MKIMAGE := $(srctree)/scripts/mkuboot.sh
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ifneq ($(MACHINE),)
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include $(srctree)/$(MACHINE)/Makefile.boot
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endif
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# Note: the following conditions must always be true:
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# ZRELADDR == virt_to_phys(PAGE_OFFSET + TEXT_OFFSET)
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# PARAMS_PHYS must be within 4MB of ZRELADDR
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# INITRD_PHYS must be in RAM
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ZRELADDR := $(zreladdr-y)
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PARAMS_PHYS := $(params_phys-y)
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INITRD_PHYS := $(initrd_phys-y)
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export ZRELADDR INITRD_PHYS PARAMS_PHYS
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targets := Image zImage xipImage bootpImage uImage
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ifeq ($(CONFIG_XIP_KERNEL),y)
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$(obj)/xipImage: vmlinux FORCE
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$(call if_changed,objcopy)
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@echo ' Kernel: $@ is ready (physical address: $(CONFIG_XIP_PHYS_ADDR))'
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$(obj)/Image $(obj)/zImage: FORCE
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@echo 'Kernel configured for XIP (CONFIG_XIP_KERNEL=y)'
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@echo 'Only the xipImage target is available in this case'
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@false
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else
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$(obj)/xipImage: FORCE
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@echo 'Kernel not configured for XIP (CONFIG_XIP_KERNEL!=y)'
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@false
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$(obj)/Image: vmlinux FORCE
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$(call if_changed,objcopy)
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@echo ' Kernel: $@ is ready'
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$(obj)/compressed/vmlinux: $(obj)/Image FORCE
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$(Q)$(MAKE) $(build)=$(obj)/compressed $@
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$(obj)/zImage: $(obj)/compressed/vmlinux FORCE
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$(call if_changed,objcopy)
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@echo ' Kernel: $@ is ready'
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endif
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quiet_cmd_uimage = UIMAGE $@
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cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A arm -O linux -T kernel \
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-C none -a $(LOADADDR) -e $(STARTADDR) \
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-n 'Linux-$(KERNELRELEASE)' -d $< $@
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ifeq ($(CONFIG_ZBOOT_ROM),y)
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$(obj)/uImage: LOADADDR=$(CONFIG_ZBOOT_ROM_TEXT)
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else
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$(obj)/uImage: LOADADDR=$(ZRELADDR)
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endif
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$(obj)/uImage: STARTADDR=$(LOADADDR)
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$(obj)/uImage: $(obj)/zImage FORCE
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$(call if_changed,uimage)
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@echo ' Image $@ is ready'
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$(obj)/bootp/bootp: $(obj)/zImage initrd FORCE
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$(Q)$(MAKE) $(build)=$(obj)/bootp $@
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@:
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$(obj)/bootpImage: $(obj)/bootp/bootp FORCE
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$(call if_changed,objcopy)
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@echo ' Kernel: $@ is ready'
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PHONY += initrd FORCE
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initrd:
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@test "$(INITRD_PHYS)" != "" || \
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(echo This machine does not support INITRD; exit -1)
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@test "$(INITRD)" != "" || \
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(echo You must specify INITRD; exit -1)
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install: $(obj)/Image
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$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
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$(obj)/Image System.map "$(INSTALL_PATH)"
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zinstall: $(obj)/zImage
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$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
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$(obj)/zImage System.map "$(INSTALL_PATH)"
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zi:
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$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
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$(obj)/zImage System.map "$(INSTALL_PATH)"
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i:
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$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
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$(obj)/Image System.map "$(INSTALL_PATH)"
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subdir- := bootp compressed
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