[PATCH 0/7] ELF: Omit section header on ELF objects

[H.J. Lu]

Section header isn't mandatory on ELF executable nor shared library.
This patch adds a new linker option, -z nosectionheader, to omit ELF
section header when building an executable or shared library, an
objcopy and strip option, --remove-section-header, to remove ELF
section header from an executable or shared library.

When there is no section header in an executable or shared library, we
reconstruct dynamic symbol table from the PT_DYNAMIC segment, which
contains DT_HASH/DT_GNU_HASH/DT_MIPS_XHASH, DT_STRTAB, DT_SYMTAB,
DT_STRSZ and DT_SYMENT entries, to improve nm and objdump.

H.J. Lu (5):
  bfd: Improve nm and objdump without section header
  readelf: Compute dynamic symbol table size from hash table
  binutils: Add --remove-section-header tests
  ld: Add tests for -z nosectionheader and --remove-section-header
  ld: Add -z nosectionheader test to bootstrap.exp

Kaylee Blake (2):
  ELF: Omit section header in ELF objects
  ld: Add a simple test for -z nosectionheader

 bfd/bfd-in2.h                                 |   8 +-
 bfd/bfd.c                                     |   8 +-
 bfd/elf-bfd.h                                 |  10 +
 bfd/elf.c                                     | 497 ++++++++++++++++++
 bfd/elfcode.h                                 |  83 ++-
 bfd/elflink.c                                 |  12 +
 bfd/elfxx-target.h                            |   6 +-
 binutils/NEWS                                 |   3 +
 binutils/doc/binutils.texi                    |  12 +
 binutils/objcopy.c                            |  54 +-
 binutils/readelf.c                            | 226 ++++----
 binutils/testsuite/binutils-all/objcopy.exp   |  13 +
 .../testsuite/binutils-all/remove-header-1.d  |   8 +
 ld/NEWS                                       |   3 +
 ld/emultempl/elf.em                           |   4 +
 ld/ld.h                                       |   3 +
 ld/ld.texi                                    |   6 +
 ld/ldlang.c                                   |   4 +
 ld/lexsup.c                                   |  12 +
 ld/testsuite/ld-bootstrap/bootstrap.exp       |  10 +-
 ld/testsuite/ld-elf/hash.d                    |   8 +-
 ld/testsuite/ld-elf/no-section-header.exp     | 374 +++++++++++++
 ld/testsuite/ld-elf/nosectionheader.d         |  12 +
 ld/testsuite/ld-elf/pr13195.d                 |   2 +-
 ld/testsuite/ld-elf/pr25617-1-no-sec-hdr.nd   |   3 +
 ld/testsuite/ld-elf/pr25617-1-no-sec-hdr.rd   |  20 +
 .../ld-elf/pr25617-1-static-no-sec-hdr.rd     |  12 +
 ld/testsuite/ld-elf/pr25617-1a-no-sec-hdr.nd  |   3 +
 ld/testsuite/ld-elf/pr25617-1a-no-sec-hdr.rd  |  20 +
 ld/testsuite/ld-elf/pr25617-1a-sec-hdr.rd     |  19 +
 ld/testsuite/ld-elf/pr25617-1a.c              |  11 +
 ld/testsuite/ld-elf/pr25617-1b.c              |  15 +
 ld/testsuite/ld-elf/start-noheader.rd         |  11 +
 .../ld-elf/start-shared-noheader-gnu.rd       |  22 +
 .../ld-elf/start-shared-noheader-sysv.rd      |  22 +
 ld/testsuite/ld-elf/start-shared-noheader.nd  |   5 +
 ld/testsuite/ld-elfvsb/hidden2.d              |   2 +-
 ld/testsuite/ld-mips-elf/hash2.d              |   8 +-
 38 files changed, 1406 insertions(+), 145 deletions(-)
 create mode 100644 binutils/testsuite/binutils-all/remove-header-1.d
 create mode 100644 ld/testsuite/ld-elf/no-section-header.exp
 create mode 100644 ld/testsuite/ld-elf/nosectionheader.d
 create mode 100644 ld/testsuite/ld-elf/pr25617-1-no-sec-hdr.nd
 create mode 100644 ld/testsuite/ld-elf/pr25617-1-no-sec-hdr.rd
 create mode 100644 ld/testsuite/ld-elf/pr25617-1-static-no-sec-hdr.rd
 create mode 100644 ld/testsuite/ld-elf/pr25617-1a-no-sec-hdr.nd
 create mode 100644 ld/testsuite/ld-elf/pr25617-1a-no-sec-hdr.rd
 create mode 100644 ld/testsuite/ld-elf/pr25617-1a-sec-hdr.rd
 create mode 100644 ld/testsuite/ld-elf/pr25617-1a.c
 create mode 100644 ld/testsuite/ld-elf/pr25617-1b.c
 create mode 100644 ld/testsuite/ld-elf/start-noheader.rd
 create mode 100644 ld/testsuite/ld-elf/start-shared-noheader-gnu.rd
 create mode 100644 ld/testsuite/ld-elf/start-shared-noheader-sysv.rd
 create mode 100644 ld/testsuite/ld-elf/start-shared-noheader.nd

-- 
2.24.1