efi: efistub: Convert into static library
This patch changes both x86 and arm64 efistub implementations from #including shared .c files under drivers/firmware/efi to building shared code as a static library. The x86 code uses a stub built into the boot executable which uncompresses the kernel at boot time. In this case, the library is linked into the decompressor. In the arm64 case, the stub is part of the kernel proper so the library is linked into the kernel proper as well. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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@ -292,6 +292,9 @@ config CMDLINE_FORCE
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This is useful if you cannot or don't want to change the
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command-line options your boot loader passes to the kernel.
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config EFI_STUB
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bool
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config EFI
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bool "UEFI runtime support"
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depends on OF && !CPU_BIG_ENDIAN
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@ -299,6 +302,8 @@ config EFI
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select UCS2_STRING
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select EFI_PARAMS_FROM_FDT
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select EFI_RUNTIME_WRAPPERS
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select EFI_STUB
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select EFI_ARMSTUB
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default y
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help
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This option provides support for runtime services provided
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@ -48,6 +48,7 @@ core-$(CONFIG_XEN) += arch/arm64/xen/
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core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
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libs-y := arch/arm64/lib/ $(libs-y)
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libs-y += $(LIBGCC)
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libs-$(CONFIG_EFI_STUB) += drivers/firmware/efi/libstub/
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# Default target when executing plain make
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KBUILD_IMAGE := Image.gz
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@ -4,8 +4,7 @@
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CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET)
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AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
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CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) \
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-I$(src)/../../../scripts/dtc/libfdt
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CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
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CFLAGS_REMOVE_ftrace.o = -pg
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CFLAGS_REMOVE_insn.o = -pg
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@ -13,12 +13,6 @@
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#include <asm/efi.h>
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#include <asm/sections.h>
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/* Include shared EFI stub code */
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#include "../../../drivers/firmware/efi/efi-stub-helper.c"
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#include "../../../drivers/firmware/efi/fdt.c"
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#include "../../../drivers/firmware/efi/arm-stub.c"
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efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
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unsigned long *image_addr,
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unsigned long *image_size,
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@ -33,7 +33,8 @@ VMLINUX_OBJS = $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
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$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
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ifeq ($(CONFIG_EFI_STUB), y)
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VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o
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VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
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$(objtree)/drivers/firmware/efi/libstub/lib.a
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endif
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$(obj)/vmlinux: $(VMLINUX_OBJS) FORCE
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@ -280,8 +280,6 @@ void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
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}
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}
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#include "../../../../drivers/firmware/efi/efi-stub-helper.c"
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static void find_bits(unsigned long mask, u8 *pos, u8 *size)
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{
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u8 first, len;
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@ -57,6 +57,9 @@ config EFI_PARAMS_FROM_FDT
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config EFI_RUNTIME_WRAPPERS
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bool
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config EFI_ARMSTUB
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bool
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endmenu
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config UEFI_CPER
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@ -7,3 +7,4 @@ obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
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obj-$(CONFIG_UEFI_CPER) += cper.o
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obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o
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obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o
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obj-$(CONFIG_EFI_STUB) += libstub/
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26
drivers/firmware/efi/libstub/Makefile
Normal file
26
drivers/firmware/efi/libstub/Makefile
Normal file
@ -0,0 +1,26 @@
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#
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# The stub may be linked into the kernel proper or into a separate boot binary,
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# but in either case, it executes before the kernel does (with MMU disabled) so
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# things like ftrace and stack-protector are likely to cause trouble if left
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# enabled, even if doing so doesn't break the build.
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#
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cflags-$(CONFIG_X86_32) := -march=i386
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cflags-$(CONFIG_X86_64) := -mcmodel=small
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cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 \
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-fPIC -fno-strict-aliasing -mno-red-zone \
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-mno-mmx -mno-sse -DDISABLE_BRANCH_PROFILING
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cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS))
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cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \
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-fno-builtin -fpic -mno-single-pic-base
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KBUILD_CFLAGS := $(cflags-y) \
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$(call cc-option,-ffreestanding) \
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$(call cc-option,-fno-stack-protector)
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GCOV_PROFILE := n
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lib-y := efi-stub-helper.o
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lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o
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CFLAGS_fdt.o += -I$(srctree)/scripts/dtc/libfdt/
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