mirror of
https://github.com/Fishwaldo/u-boot.git
synced 2025-03-28 10:01:32 +00:00
a139cc1865
With newer kernel.org GCC (7.3.0 or 8.1.0), the u-boot.rom image built for qemu-x86_64 target does not boot. It keeps resetting soon after the 32-bit SPL jumps to 64-bit proper. Debugging shows that the reset happens inside env_callback_init(). 000000000113dd85 <env_callback_init>: 113dd85: 41 54 push %r12 113dd87: 55 push %rbp 113dd88: 31 c0 xor %eax,%eax 113dd8a: 53 push %rbx 113dd8b: 0f 57 c0 xorps %xmm0,%xmm0 Executing "xorps %xmm0,%xmm0" causes CPU to immediately reset. However older GCC like 5.4.0 (the one shipped by Ubuntu 16.04) does not generate such instructions that utilizes SSE for this function - env_callback_init() and U-Boot boots without any issue. Explicitly specifying -march=core2 for newer GCC allows U-Boot proper to boot again. Examine assembly codes of env_callback_init and there is no SSE instruction in that function hence U-Boot continues to boot. core2 seems to be the oldest arch in GCC that supports 64-bit. Like 32-bit U-Boot build we use -march=i386 which is the most conservative cpu type so that the image can run on any x86 processor, let's do the same for the 64-bit U-Boot build. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
118 lines
2.6 KiB
Makefile
118 lines
2.6 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 += -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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else
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PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -march=core2 -m64
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endif
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PLATFORM_RELFLAGS += -fdata-sections -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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