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https://github.com/brain-hackers/u-boot-brain
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7e21fbca26
Some times gcc may generate data that is then used within code that may be part of an efi runtime section. That data could be jump tables, constants or strings. In order to make sure we catch these, we need to ensure that gcc emits them into a section that we can relocate together with all the other efi runtime bits. This only works if the -ffunction-sections and -fdata-sections flags are passed and the efi runtime functions are in a section that starts with ".text". Up to now we had all efi runtime bits in sections that did not interfere with the normal section naming scheme, but this forces us to do so. Hence we need to move the efi_loader text/data/rodata sections before the global *(.text*) catch-all section. With this patch in place, we should hopefully have an easier time to extend the efi runtime functionality in the future. Signed-off-by: Alexander Graf <agraf@suse.de> [agraf: Fix x86_64 breakage]
122 lines
2.7 KiB
Makefile
122 lines
2.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0+
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#
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# (C) Copyright 2000-2002
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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CONFIG_STANDALONE_LOAD_ADDR ?= 0x40000
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PLATFORM_CPPFLAGS += -fno-strict-aliasing
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PLATFORM_CPPFLAGS += -fomit-frame-pointer
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PF_CPPFLAGS_X86 := $(call cc-option, -fno-toplevel-reorder, \
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$(call cc-option, -fno-unit-at-a-time))
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PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_X86)
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PLATFORM_CPPFLAGS += -fno-dwarf2-cfi-asm
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ifdef CONFIG_SPL_BUILD
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IS_32BIT := y
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else
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ifndef CONFIG_X86_64
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IS_32BIT := y
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endif
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endif
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ifeq ($(IS_32BIT),y)
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PLATFORM_CPPFLAGS += -march=i386 -m32
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# TODO: These break on x86_64; need to debug further
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PLATFORM_RELFLAGS += -fdata-sections
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else
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PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -m64
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endif
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PLATFORM_RELFLAGS += -ffunction-sections -fvisibility=hidden
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PLATFORM_LDFLAGS += -Bsymbolic -Bsymbolic-functions
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PLATFORM_LDFLAGS += -m $(if $(IS_32BIT),elf_i386,elf_x86_64)
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# This is used in the top-level Makefile which does not include
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# PLATFORM_LDFLAGS
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LDFLAGS_EFI_PAYLOAD := -Bsymbolic -Bsymbolic-functions -shared --no-undefined
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OBJCOPYFLAGS_EFI := -j .text -j .sdata -j .data -j .dynamic -j .dynsym \
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-j .rel -j .rela -j .reloc
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ifeq ($(IS_32BIT),y)
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CFLAGS_NON_EFI := -mregparm=3
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endif
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CFLAGS_EFI := -fpic -fshort-wchar
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ifeq ($(CONFIG_EFI_STUB_64BIT),)
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CFLAGS_EFI += $(call cc-option, -mno-red-zone)
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EFIARCH = ia32
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EFIPAYLOAD_BFDTARGET = elf32-i386
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else
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EFIARCH = x86_64
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EFIPAYLOAD_BFDTARGET = elf64-x86-64
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endif
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EFIPAYLOAD_BFDARCH = i386
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LDSCRIPT_EFI := $(srctree)/arch/x86/lib/elf_$(EFIARCH)_efi.lds
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EFISTUB := crt0_$(EFIARCH)_efi.o reloc_$(EFIARCH)_efi.o
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OBJCOPYFLAGS_EFI += --target=efi-app-$(EFIARCH)
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CPPFLAGS_REMOVE_crt0-efi-$(EFIARCH).o += $(CFLAGS_NON_EFI)
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CPPFLAGS_crt0-efi-$(EFIARCH).o += $(CFLAGS_EFI)
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ifeq ($(CONFIG_EFI_APP),y)
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PLATFORM_CPPFLAGS += $(CFLAGS_EFI)
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LDFLAGS_FINAL += -znocombreloc -shared
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LDSCRIPT := $(LDSCRIPT_EFI)
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else
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PLATFORM_CPPFLAGS += $(CFLAGS_NON_EFI)
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PLATFORM_LDFLAGS += --emit-relocs
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LDFLAGS_FINAL += --gc-sections $(if $(CONFIG_SPL_BUILD),,-pie)
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endif
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ifdef CONFIG_X86_64
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ifndef CONFIG_SPL_BUILD
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PLATFORM_CPPFLAGS += -D__x86_64__
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else
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PLATFORM_CPPFLAGS += -D__I386__
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endif
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else
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PLATFORM_CPPFLAGS += -D__I386__
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endif
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ifdef CONFIG_EFI_STUB
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ifdef CONFIG_EFI_STUB_64BIT
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EFI_LDS := elf_x86_64_efi.lds
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EFI_CRT0 := crt0_x86_64_efi.o
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EFI_RELOC := reloc_x86_64_efi.o
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else
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EFI_LDS := elf_ia32_efi.lds
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EFI_CRT0 := crt0_ia32_efi.o
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EFI_RELOC := reloc_ia32_efi.o
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endif
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else
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ifdef CONFIG_X86_64
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EFI_LDS := elf_x86_64_efi.lds
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EFI_CRT0 := crt0_x86_64_efi.o
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EFI_RELOC := reloc_x86_64_efi.o
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else
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EFI_LDS := elf_ia32_efi.lds
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EFI_CRT0 := crt0_ia32_efi.o
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EFI_RELOC := reloc_ia32_efi.o
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endif
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endif
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ifdef CONFIG_X86_64
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EFI_TARGET := --target=efi-app-x86_64
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else
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EFI_TARGET := --target=efi-app-ia32
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endif
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