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[mini-os master] mini-os: use -m elf_i386 for final linking

commit 203498c11cdb4e0dbfc90aa8d60319032288925c
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Apr 16 15:17:15 2020 +0200
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Thu Apr 16 14:29:16 2020 +0100

    mini-os: use -m elf_i386 for final linking
    Using the standard -m elf_x86_64 for 64-bit mini-os results in the
    first section (.text) to start only at offset 2MB in the binary file.
    Quoting Andrew Cooper on that topic:
      Specifically, 64bit emulation appears to include "align primary
      sections to 2M so your OS can make better use of superpages even when
      mmap()ing", with no way I can spot to override this in the linker
    Using -m elf_i386 avoids that problem without any visible disadvantage.
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
 arch/x86/arch.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/arch.mk b/arch/x86/arch.mk
index c87885f..00028a0 100644
--- a/arch/x86/arch.mk
+++ b/arch/x86/arch.mk
@@ -26,3 +26,5 @@ ifeq ($(CONFIG_PARAVIRT),n)
 ARCH_LDFLAGS_FINAL := --oformat=elf32-i386
 ARCH_AS_DEPS += x86_hvm.S
+ARCH_LDFLAGS_FINAL += -m elf_i386
generated by git-patchbot for /home/xen/git/mini-os.git#master



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