| Makefile (cc49c71d2abe99c1c2c9bedf0693ad2d3ee4a067) | Makefile (2c7d1e30e5884dc6f6727ecd9417491c9f321b59) |
|---|---|
| 1# SPDX-License-Identifier: GPL-2.0 2# 3# The stub may be linked into the kernel proper or into a separate boot binary, 4# but in either case, it executes before the kernel does (with MMU disabled) so 5# things like ftrace and stack-protector are likely to cause trouble if left 6# enabled, even if doing so doesn't break the build. 7# 8cflags-$(CONFIG_X86_32) := -march=i386 --- 9 unchanged lines hidden (view full) --- 18# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly 19# disable the stackleak plugin 20cflags-$(CONFIG_ARM64) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ 21 -fpie $(DISABLE_STACKLEAK_PLUGIN) 22cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ 23 -fno-builtin -fpic \ 24 $(call cc-option,-mno-single-pic-base) 25 | 1# SPDX-License-Identifier: GPL-2.0 2# 3# The stub may be linked into the kernel proper or into a separate boot binary, 4# but in either case, it executes before the kernel does (with MMU disabled) so 5# things like ftrace and stack-protector are likely to cause trouble if left 6# enabled, even if doing so doesn't break the build. 7# 8cflags-$(CONFIG_X86_32) := -march=i386 --- 9 unchanged lines hidden (view full) --- 18# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly 19# disable the stackleak plugin 20cflags-$(CONFIG_ARM64) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ 21 -fpie $(DISABLE_STACKLEAK_PLUGIN) 22cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ 23 -fno-builtin -fpic \ 24 $(call cc-option,-mno-single-pic-base) 25 |
| 26cflags-$(CONFIG_EFI_ARMSTUB) += -I$(srctree)/scripts/dtc/libfdt | 26cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt |
| 27 28KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \ 29 -include $(srctree)/drivers/firmware/efi/libstub/hidden.h \ 30 -D__NO_FORTIFY \ 31 $(call cc-option,-ffreestanding) \ 32 $(call cc-option,-fno-stack-protector) \ | 27 28KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \ 29 -include $(srctree)/drivers/firmware/efi/libstub/hidden.h \ 30 -D__NO_FORTIFY \ 31 $(call cc-option,-ffreestanding) \ 32 $(call cc-option,-fno-stack-protector) \ |
| 33 $(call cc-option,-fno-addrsig) \ |
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| 33 -D__DISABLE_EXPORTS 34 | 34 -D__DISABLE_EXPORTS 35 |
| 35# remove SCS flags from all objects in this directory 36KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) 37 | |
| 38GCOV_PROFILE := n 39KASAN_SANITIZE := n 40UBSAN_SANITIZE := n 41OBJECT_FILES_NON_STANDARD := y 42 43# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 44KCOV_INSTRUMENT := n 45 46lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \ 47 file.o mem.o random.o randomalloc.o pci.o \ | 36GCOV_PROFILE := n 37KASAN_SANITIZE := n 38UBSAN_SANITIZE := n 39OBJECT_FILES_NON_STANDARD := y 40 41# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. 42KCOV_INSTRUMENT := n 43 44lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \ 45 file.o mem.o random.o randomalloc.o pci.o \ |
| 48 skip_spaces.o lib-cmdline.o lib-ctype.o | 46 skip_spaces.o lib-cmdline.o lib-ctype.o \ 47 alignedmem.o relocate.o vsprintf.o |
| 49 50# include the stub's generic dependencies from lib/ when building for ARM/arm64 | 48 49# include the stub's generic dependencies from lib/ when building for ARM/arm64 |
| 51arm-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c | 50efi-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c |
| 52 53$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE 54 $(call if_changed_rule,cc_o_c) 55 | 51 52$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE 53 $(call if_changed_rule,cc_o_c) 54 |
| 56lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o \ 57 $(patsubst %.c,lib-%.o,$(arm-deps-y)) | 55lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o fdt.o string.o \ 56 $(patsubst %.c,lib-%.o,$(efi-deps-y)) |
| 58 59lib-$(CONFIG_ARM) += arm32-stub.o 60lib-$(CONFIG_ARM64) += arm64-stub.o 61lib-$(CONFIG_X86) += x86-stub.o 62CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) 63CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) 64 65# | 57 58lib-$(CONFIG_ARM) += arm32-stub.o 59lib-$(CONFIG_ARM64) += arm64-stub.o 60lib-$(CONFIG_X86) += x86-stub.o 61CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) 62CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) 63 64# |
| 65# For x86, bootloaders like systemd-boot or grub-efi do not zero-initialize the 66# .bss section, so the .bss section of the EFI stub needs to be included in the 67# .data section of the compressed kernel to ensure initialization. Rename the 68# .bss section here so it's easy to pick out in the linker script. 69# 70STUBCOPY_FLAGS-$(CONFIG_X86) += --rename-section .bss=.bss.efistub,load,alloc 71STUBCOPY_RELOC-$(CONFIG_X86_32) := R_386_32 72STUBCOPY_RELOC-$(CONFIG_X86_64) := R_X86_64_64 73 74# 75# ARM discards the .data section because it disallows r/w data in the 76# decompressor. So move our .data to .data.efistub and .bss to .bss.efistub, 77# which are preserved explicitly by the decompressor linker script. 78# 79STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub \ 80 --rename-section .bss=.bss.efistub,load,alloc 81STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS 82 83# |
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| 66# arm64 puts the stub in the kernel proper, which will unnecessarily retain all 67# code indefinitely unless it is annotated as __init/__initdata/__initconst etc. 68# So let's apply the __init annotations at the section level, by prefixing 69# the section names directly. This will ensure that even all the inline string 70# literals are covered. 71# The fact that the stub and the kernel proper are essentially the same binary 72# also means that we need to be extra careful to make sure that the stub does 73# not rely on any absolute symbol references, considering that the virtual 74# kernel mapping that the linker uses is not active yet when the stub is 75# executing. So build all C dependencies of the EFI stub into libstub, and do 76# a verification pass to see if any absolute relocations exist in any of the 77# object files. 78# | 84# arm64 puts the stub in the kernel proper, which will unnecessarily retain all 85# code indefinitely unless it is annotated as __init/__initdata/__initconst etc. 86# So let's apply the __init annotations at the section level, by prefixing 87# the section names directly. This will ensure that even all the inline string 88# literals are covered. 89# The fact that the stub and the kernel proper are essentially the same binary 90# also means that we need to be extra careful to make sure that the stub does 91# not rely on any absolute symbol references, considering that the virtual 92# kernel mapping that the linker uses is not active yet when the stub is 93# executing. So build all C dependencies of the EFI stub into libstub, and do 94# a verification pass to see if any absolute relocations exist in any of the 95# object files. 96# |
| 79extra-$(CONFIG_EFI_ARMSTUB) := $(lib-y) 80lib-$(CONFIG_EFI_ARMSTUB) := $(patsubst %.o,%.stub.o,$(lib-y)) | 97extra-y := $(lib-y) 98lib-y := $(patsubst %.o,%.stub.o,$(lib-y)) |
| 81 82STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \ 83 --prefix-symbols=__efistub_ 84STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS 85 86$(obj)/%.stub.o: $(obj)/%.o FORCE 87 $(call if_changed,stubcopy) 88 --- 6 unchanged lines hidden (view full) --- 95quiet_cmd_stubcopy = STUBCPY $@ 96 cmd_stubcopy = \ 97 $(STRIP) --strip-debug -o $@ $<; \ 98 if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); then \ 99 echo "$@: absolute symbol references not allowed in the EFI stub" >&2; \ 100 /bin/false; \ 101 fi; \ 102 $(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@ | 99 100STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \ 101 --prefix-symbols=__efistub_ 102STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS 103 104$(obj)/%.stub.o: $(obj)/%.o FORCE 105 $(call if_changed,stubcopy) 106 --- 6 unchanged lines hidden (view full) --- 113quiet_cmd_stubcopy = STUBCPY $@ 114 cmd_stubcopy = \ 115 $(STRIP) --strip-debug -o $@ $<; \ 116 if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); then \ 117 echo "$@: absolute symbol references not allowed in the EFI stub" >&2; \ 118 /bin/false; \ 119 fi; \ 120 $(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@ |
| 103 104# 105# ARM discards the .data section because it disallows r/w data in the 106# decompressor. So move our .data to .data.efistub, which is preserved 107# explicitly by the decompressor linker script. 108# 109STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub 110STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS | |