u-boot/arch/x86/config.mk
Bin Meng e719b6b0f8 x86: Enforce toolchain to generate 64-bit codes for 64-bit U-Boot
64-bit U-Boot image is a combination of 32-bit U-Boot (SPL) plus
64-bit U-Boot (proper). For the U-Boot proper, it has be compiled
to 64-bit object codes. Attempting to use a toolchain to compile
64-bit U-Boot for qemu-x86_64, like kernel.org 4.9 i386-linux-gcc,
fails with the following errors:

  arch/x86/cpu/intel_common/microcode.c:79:2: error: PIC register
  clobbered by 'ebx' in 'asm'

The issue is because toolchain is preconfigured to generate code
for the 32-bit architecture (i386), and currently '-m64' is missing
in the makefile fragment. Using kernel.org 4.9 x86_64-linux-gcc
works out of the box, since it is preconfigured to generate 64-bit
codes.

When compiling U-Boot SPL, '-m32' is passed to the toolchain, no
mater 32-bit (i386-linux-) or 64-bit (x86_64-linux) the toolchain
is preconfigured to generate.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-08-01 20:17:02 +08:00

108 lines
2.6 KiB
Makefile

#
# (C) Copyright 2000-2002
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# SPDX-License-Identifier: GPL-2.0+
#
CONFIG_STANDALONE_LOAD_ADDR ?= 0x40000
PLATFORM_CPPFLAGS += -fno-strict-aliasing
PLATFORM_CPPFLAGS += -fomit-frame-pointer
PF_CPPFLAGS_X86 := $(call cc-option, -fno-toplevel-reorder, \
$(call cc-option, -fno-unit-at-a-time))
PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_X86)
PLATFORM_CPPFLAGS += -fno-dwarf2-cfi-asm
ifdef CONFIG_SPL_BUILD
IS_32BIT := y
else
ifndef CONFIG_X86_64
IS_32BIT := y
endif
endif
ifeq ($(IS_32BIT),y)
PLATFORM_CPPFLAGS += -march=i386 -m32
else
PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -m64
endif
PLATFORM_RELFLAGS += -ffunction-sections -fvisibility=hidden
PLATFORM_LDFLAGS += -Bsymbolic -Bsymbolic-functions
PLATFORM_LDFLAGS += -m $(if $(IS_32BIT),elf_i386,elf_x86_64)
LDFLAGS_FINAL += --wrap=__divdi3 --wrap=__udivdi3
LDFLAGS_FINAL += --wrap=__moddi3 --wrap=__umoddi3
# This is used in the top-level Makefile which does not include
# PLATFORM_LDFLAGS
LDFLAGS_EFI_PAYLOAD := -Bsymbolic -Bsymbolic-functions -shared --no-undefined
OBJCOPYFLAGS_EFI := -j .text -j .sdata -j .data -j .dynamic -j .dynsym \
-j .rel -j .rela -j .reloc
ifeq ($(IS_32BIT),y)
CFLAGS_NON_EFI := -mregparm=3
endif
CFLAGS_EFI := -fpic -fshort-wchar
ifeq ($(CONFIG_EFI_STUB_64BIT),)
CFLAGS_EFI += $(call cc-option, -mno-red-zone)
EFIARCH = ia32
EFIPAYLOAD_BFDTARGET = elf32-i386
else
EFIARCH = x86_64
EFIPAYLOAD_BFDTARGET = elf64-x86-64
endif
EFIPAYLOAD_BFDARCH = i386
LDSCRIPT_EFI := $(srctree)/arch/x86/lib/elf_$(EFIARCH)_efi.lds
EFISTUB := crt0_$(EFIARCH)_efi.o reloc_$(EFIARCH)_efi.o
OBJCOPYFLAGS_EFI += --target=efi-app-$(EFIARCH)
CPPFLAGS_REMOVE_crt0-efi-$(EFIARCH).o += $(CFLAGS_NON_EFI)
CPPFLAGS_crt0-efi-$(EFIARCH).o += $(CFLAGS_EFI)
ifeq ($(CONFIG_EFI_APP),y)
PLATFORM_CPPFLAGS += $(CFLAGS_EFI)
LDFLAGS_FINAL += -znocombreloc -shared
LDSCRIPT := $(LDSCRIPT_EFI)
else
PLATFORM_CPPFLAGS += $(CFLAGS_NON_EFI)
PLATFORM_LDFLAGS += --emit-relocs
LDFLAGS_FINAL += --gc-sections $(if $(CONFIG_SPL_BUILD),,-pie)
endif
ifdef CONFIG_X86_64
ifndef CONFIG_SPL_BUILD
PLATFORM_CPPFLAGS += -D__x86_64__
else
PLATFORM_CPPFLAGS += -D__I386__
endif
else
PLATFORM_CPPFLAGS += -D__I386__
endif
ifneq ($(CONFIG_EFI_STUB)$(CONFIG_CMD_BOOTEFI_HELLO_COMPILE),)
ifneq ($(CONFIG_EFI_STUB_64BIT),)
EFI_LDS := elf_x86_64_efi.lds
EFI_CRT0 := crt0_x86_64_efi.o
EFI_RELOC := reloc_x86_64_efi.o
EFI_TARGET := --target=efi-app-ia32
else
EFI_LDS := elf_ia32_efi.lds
EFI_CRT0 := crt0_ia32_efi.o
EFI_RELOC := reloc_ia32_efi.o
EFI_TARGET := --target=efi-app-x86_64
endif
endif