From f4f75ad5741fe0331bbe1f5c42b906cda299f26b Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Wed, 2 Jul 2014 14:54:43 +0200 Subject: [PATCH] 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 Signed-off-by: Matt Fleming --- arch/arm64/Kconfig | 5 ++++ arch/arm64/Makefile | 1 + arch/arm64/kernel/Makefile | 3 +-- arch/arm64/kernel/efi-stub.c | 6 ----- arch/x86/boot/compressed/Makefile | 3 ++- arch/x86/boot/compressed/eboot.c | 2 -- drivers/firmware/efi/Kconfig | 3 +++ drivers/firmware/efi/Makefile | 1 + drivers/firmware/efi/libstub/Makefile | 26 +++++++++++++++++++ drivers/firmware/efi/{ => libstub}/arm-stub.c | 0 .../efi/{ => libstub}/efi-stub-helper.c | 0 drivers/firmware/efi/{ => libstub}/efistub.h | 0 drivers/firmware/efi/{ => libstub}/fdt.c | 0 13 files changed, 39 insertions(+), 11 deletions(-) create mode 100644 drivers/firmware/efi/libstub/Makefile rename drivers/firmware/efi/{ => libstub}/arm-stub.c (100%) rename drivers/firmware/efi/{ => libstub}/efi-stub-helper.c (100%) rename drivers/firmware/efi/{ => libstub}/efistub.h (100%) rename drivers/firmware/efi/{ => libstub}/fdt.c (100%) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 2cc14cef01bd..3a0a4ce4c751 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -292,6 +292,9 @@ config CMDLINE_FORCE This is useful if you cannot or don't want to change the command-line options your boot loader passes to the kernel. +config EFI_STUB + bool + config EFI bool "UEFI runtime support" depends on OF && !CPU_BIG_ENDIAN @@ -299,6 +302,8 @@ config EFI select UCS2_STRING select EFI_PARAMS_FROM_FDT select EFI_RUNTIME_WRAPPERS + select EFI_STUB + select EFI_ARMSTUB default y help This option provides support for runtime services provided diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 8185a913c5ed..5836717d2f66 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -48,6 +48,7 @@ core-$(CONFIG_XEN) += arch/arm64/xen/ core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ libs-y := arch/arm64/lib/ $(libs-y) libs-y += $(LIBGCC) +libs-$(CONFIG_EFI_STUB) += drivers/firmware/efi/libstub/ # Default target when executing plain make KBUILD_IMAGE := Image.gz diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index cdaedad3afe5..afaeb734295a 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -4,8 +4,7 @@ CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET) AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET) -CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) \ - -I$(src)/../../../scripts/dtc/libfdt +CFLAGS_efi-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) CFLAGS_REMOVE_ftrace.o = -pg CFLAGS_REMOVE_insn.o = -pg diff --git a/arch/arm64/kernel/efi-stub.c b/arch/arm64/kernel/efi-stub.c index e4999021b07d..1317fef8dde9 100644 --- a/arch/arm64/kernel/efi-stub.c +++ b/arch/arm64/kernel/efi-stub.c @@ -13,12 +13,6 @@ #include #include -/* Include shared EFI stub code */ -#include "../../../drivers/firmware/efi/efi-stub-helper.c" -#include "../../../drivers/firmware/efi/fdt.c" -#include "../../../drivers/firmware/efi/arm-stub.c" - - efi_status_t handle_kernel_image(efi_system_table_t *sys_table, unsigned long *image_addr, unsigned long *image_size, diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 0fcd9133790c..7a801a310e37 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -33,7 +33,8 @@ VMLINUX_OBJS = $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \ $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone ifeq ($(CONFIG_EFI_STUB), y) - VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o + VMLINUX_OBJS += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \ + $(objtree)/drivers/firmware/efi/libstub/lib.a endif $(obj)/vmlinux: $(VMLINUX_OBJS) FORCE diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index 916bbdd7dd28..3b5c66c8f749 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -280,8 +280,6 @@ void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str) } } -#include "../../../../drivers/firmware/efi/efi-stub-helper.c" - static void find_bits(unsigned long mask, u8 *pos, u8 *size) { u8 first, len; diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index 588dc47e7075..f712d47f30d8 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -57,6 +57,9 @@ config EFI_PARAMS_FROM_FDT config EFI_RUNTIME_WRAPPERS bool +config EFI_ARMSTUB + bool + endmenu config UEFI_CPER diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index e1096539eedb..a204d1474cec 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o obj-$(CONFIG_UEFI_CPER) += cper.o obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o +obj-$(CONFIG_EFI_STUB) += libstub/ diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile new file mode 100644 index 000000000000..b14bc2b9fb4d --- /dev/null +++ b/drivers/firmware/efi/libstub/Makefile @@ -0,0 +1,26 @@ +# +# The stub may be linked into the kernel proper or into a separate boot binary, +# but in either case, it executes before the kernel does (with MMU disabled) so +# things like ftrace and stack-protector are likely to cause trouble if left +# enabled, even if doing so doesn't break the build. +# +cflags-$(CONFIG_X86_32) := -march=i386 +cflags-$(CONFIG_X86_64) := -mcmodel=small +cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ + -fPIC -fno-strict-aliasing -mno-red-zone \ + -mno-mmx -mno-sse -DDISABLE_BRANCH_PROFILING + +cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS)) +cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \ + -fno-builtin -fpic -mno-single-pic-base + +KBUILD_CFLAGS := $(cflags-y) \ + $(call cc-option,-ffreestanding) \ + $(call cc-option,-fno-stack-protector) + +GCOV_PROFILE := n + +lib-y := efi-stub-helper.o +lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o + +CFLAGS_fdt.o += -I$(srctree)/scripts/dtc/libfdt/ diff --git a/drivers/firmware/efi/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c similarity index 100% rename from drivers/firmware/efi/arm-stub.c rename to drivers/firmware/efi/libstub/arm-stub.c diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c similarity index 100% rename from drivers/firmware/efi/efi-stub-helper.c rename to drivers/firmware/efi/libstub/efi-stub-helper.c diff --git a/drivers/firmware/efi/efistub.h b/drivers/firmware/efi/libstub/efistub.h similarity index 100% rename from drivers/firmware/efi/efistub.h rename to drivers/firmware/efi/libstub/efistub.h diff --git a/drivers/firmware/efi/fdt.c b/drivers/firmware/efi/libstub/fdt.c similarity index 100% rename from drivers/firmware/efi/fdt.c rename to drivers/firmware/efi/libstub/fdt.c -- 2.20.1