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PR30592 objcopy: allow --set-section-flags to add or remove SHF_X86_64_LARGE

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For example, objcopy --set-section-flags .data=alloc,large will add
SHF_X86_64_LARGE to the .data section.  Omitting "large" will drop the
SHF_X86_64_LARGE flag.

The bfd_section flag is named generically, SEC_ELF_LARGE, in case other
processors want to follow SHF_X86_64_LARGE.  SEC_ELF_LARGE has the same
value as SEC_TIC54X_BLOCK used by coff.

bfd/
    * section.c: Define SEC_ELF_LARGE.
    * bfd-in2.h: Regenerate.
    * elf64-x86-64.c (elf_x86_64_section_flags, elf_x86_64_fake_sections,
    elf_x86_64_copy_private_section_data): New.

binutils/
    * NEWS: Mention the new feature for objcopy.
    * doc/binutils.texi: Mention "large".
    * objcopy.c (parse_flags): Parse "large".
    (check_new_section_flags): Error if "large" is used with a
    non-x86-64 ELF target.
    * testsuite/binutils-all/x86-64/large-sections.d: New.
    * testsuite/binutils-all/x86-64/large-sections.s: New.
    * testsuite/binutils-all/x86-64/large-sections-i386.d: New.
    * testsuite/binutils-all/x86-64/large-sections-2.d: New.
    * testsuite/binutils-all/x86-64/large-sections-2-x32.d: New.
This commit is contained in:
Fangrui Song
2023-07-09 10:57:19 -07:00
committed by Fangrui Song
parent 4fb2abb59d
commit 5e24da908d
13 changed files with 155 additions and 10 deletions
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15
binutils/doc/binutils.texi
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@@ -1745,13 +1745,14 @@ Set the flags for any sections matching @var{sectionpattern}. The
@var{flags} argument is a comma separated string of flag names. The
recognized names are @samp{alloc}, @samp{contents}, @samp{load},
@samp{noload}, @samp{readonly}, @samp{code}, @samp{data}, @samp{rom},
@samp{exclude}, @samp{share}, and @samp{debug}. You can set the
@samp{contents} flag for a section which does not have contents, but it
is not meaningful to clear the @samp{contents} flag of a section which
does have contents--just remove the section instead. Not all flags are
meaningful for all object file formats. In particular the
@samp{share} flag is only meaningful for COFF format files and not for
ELF format files.
@samp{exclude}, @samp{share}, @samp{debug}, and @samp{large}.
You can set the @samp{contents} flag for a section which does not have
contents, but it is not meaningful to clear the @samp{contents} flag of a
section which does have contents--just remove the section instead. Not all
flags are meaningful for all object file formats. In particular the
@samp{share} flag is only meaningful for COFF format files and not for ELF
format files. The ELF x86-64 specific flag @samp{large} corresponds to
SHF_X86_64_LARGE.
@item --set-section-alignment @var{sectionpattern}=@var{align}
Set the alignment for any sections matching @var{sectionpattern}.