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author | Kaylee Blake <klkblake@gmail.com> | 2020-03-04 19:18:07 +1030 |
---|---|---|
committer | H.J. Lu <hjl.tools@gmail.com> | 2023-06-29 10:29:46 -0700 |
commit | 96cc7918c18cdb7bd0331d836fa7f05341732580 (patch) | |
tree | 906a911fb1b123f4ae238f8504671b1aeecbbe89 /binutils/objcopy.c | |
parent | fa2b501cdcbb7e9e8437f1dfb4b1e939dcb07264 (diff) | |
download | binutils-96cc7918c18cdb7bd0331d836fa7f05341732580.zip binutils-96cc7918c18cdb7bd0331d836fa7f05341732580.tar.gz binutils-96cc7918c18cdb7bd0331d836fa7f05341732580.tar.bz2 |
ELF: Strip section header in ELF objects
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, a new objcopy and strip option, --strip-section-headers,
to remove ELF section headers.
bfd/
2023-06-06 H.J. Lu <hongjiu.lu@intel.com>
Kaylee Blake <klkblake@gmail.com>
PR ld/25617
* bfd.c (BFD_NO_SECTION_HEADER): New.
(BFD_FLAGS_SAVED): Add BFD_NO_SECTION_HEADER.
(BFD_FLAGS_FOR_BFD_USE_MASK): Likewise.
* elfcode.h (elf_swap_ehdr_out): Omit section header with
BFD_NO_SECTION_HEADER.
(elf_write_shdrs_and_ehdr): Likewise.
* elfxx-target.h (TARGET_BIG_SYM): Add BFD_NO_SECTION_HEADER
to object_flags.
(TARGET_LITTLE_SYM): Likewise.
* bfd-in2.h: Regenerated.
binutils/
2023-06-06 H.J. Lu <hongjiu.lu@intel.com>
PR ld/25617
* NEWS: Mention --strip-section-headers for objcopy and strip.
* objcopy.c (strip_section_headers): New.
(command_line_switch): Add OPTION_STRIP_SECTION_HEADERS.
(strip_options): Add --strip-section-headers.
(copy_options): Likewise.
(copy_usage): Add --strip-section-headers.
(strip_usage): Likewise.
(copy_object): Handle --strip-section-headers for ELF files.
(strip_main): Handle OPTION_STRIP_SECTION_HEADERS.
(copy_main): Likewise.
* doc/binutils.texi: Document --strip-section-headers for objcopy
and strip.
ld/
2023-06-06 H.J. Lu <hongjiu.lu@intel.com>
Kaylee Blake <klkblake@gmail.com>
PR ld/25617
* NEWS: Mention -z nosectionheader.
* emultempl/elf.em: Support -z sectionheader and
-z nosectionheader.
* ld.h (ld_config_type): Add no_section_header.
* ld.texi: Document -z sectionheader and -z nosectionheader.
* ldlang.c (ldlang_open_output): Handle
config.no_section_header.
* lexsup.c (parse_args): Enable --strip-all with
-z nosectionheader. Disallow -r with -z nosectionheader.
(elf_static_list_options): Add -z sectionheader and
-z nosectionheader.
Diffstat (limited to 'binutils/objcopy.c')
-rw-r--r-- | binutils/objcopy.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/binutils/objcopy.c b/binutils/objcopy.c index 4140077..206d80b 100644 --- a/binutils/objcopy.c +++ b/binutils/objcopy.c @@ -97,6 +97,7 @@ static int deterministic = -1; /* Enable deterministic archives. */ static int status = 0; /* Exit status. */ static bool merge_notes = false; /* Merge note sections. */ +static bool strip_section_headers = false;/* Strip section headers. */ typedef struct merged_note_section { @@ -365,6 +366,7 @@ enum command_line_switch OPTION_SREC_LEN, OPTION_STACK, OPTION_STRIP_DWO, + OPTION_STRIP_SECTION_HEADERS, OPTION_STRIP_SYMBOLS, OPTION_STRIP_UNNEEDED, OPTION_STRIP_UNNEEDED_SYMBOL, @@ -403,6 +405,7 @@ static struct option strip_options[] = {"preserve-dates", no_argument, 0, 'p'}, {"remove-section", required_argument, 0, 'R'}, {"remove-relocations", required_argument, 0, OPTION_REMOVE_RELOCS}, + {"strip-section-headers", no_argument, 0, OPTION_STRIP_SECTION_HEADERS}, {"strip-all", no_argument, 0, 's'}, {"strip-debug", no_argument, 0, 'S'}, {"strip-dwo", no_argument, 0, OPTION_STRIP_DWO}, @@ -492,6 +495,7 @@ static struct option copy_options[] = {"remove-leading-char", no_argument, 0, OPTION_REMOVE_LEADING_CHAR}, {"remove-section", required_argument, 0, 'R'}, {"remove-relocations", required_argument, 0, OPTION_REMOVE_RELOCS}, + {"strip-section-headers", no_argument, 0, OPTION_STRIP_SECTION_HEADERS}, {"rename-section", required_argument, 0, OPTION_RENAME_SECTION}, {"reverse-bytes", required_argument, 0, OPTION_REVERSE_BYTES}, {"section-alignment", required_argument, 0, OPTION_PE_SECTION_ALIGNMENT}, @@ -592,6 +596,7 @@ copy_usage (FILE *stream, int exit_status) --add-gnu-debuglink=<file> Add section .gnu_debuglink linking to <file>\n\ -R --remove-section <name> Remove section <name> from the output\n\ --remove-relocations <name> Remove relocations from section <name>\n\ + --strip-section-headers Strip section header from the output\n\ -S --strip-all Remove all symbol and relocation information\n\ -g --strip-debug Remove all debugging symbols & sections\n\ --strip-dwo Remove all DWO sections\n\ @@ -730,6 +735,7 @@ strip_usage (FILE *stream, int exit_status) fprintf (stream, _("\ -R --remove-section=<name> Also remove section <name> from the output\n\ --remove-relocations <name> Remove relocations from section <name>\n\ + --strip-section-headers Strip section headers from the output\n\ -s --strip-all Remove all symbol and relocation information\n\ -g -S -d --strip-debug Remove all debugging symbols & sections\n\ --strip-dwo Remove all DWO sections\n\ @@ -2695,7 +2701,16 @@ copy_object (bfd *ibfd, bfd *obfd, const bfd_arch_info_type *input_arch) necessary. */ VerilogDataEndianness = ibfd->xvec->byteorder; - if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) + if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour) + { + if (strip_section_headers) + { + ibfd->flags |= BFD_NO_SECTION_HEADER; + strip_symbols = STRIP_ALL; + merge_notes = true; + } + } + else { if ((do_debug_sections & compress) != 0 && do_debug_sections != compress) @@ -2712,6 +2727,13 @@ copy_object (bfd *ibfd, bfd *obfd, const bfd_arch_info_type *input_arch) bfd_get_archive_filename (ibfd)); return false; } + + if (strip_section_headers) + { + non_fatal (_("--strip_section_headers is unsupported on `%s'"), + bfd_get_archive_filename (ibfd)); + return false; + } } if (verbose) @@ -3456,7 +3478,7 @@ copy_object (bfd *ibfd, bfd *obfd, const bfd_arch_info_type *input_arch) free (merged); } } - else if (merge_notes && ! is_strip) + else if (merge_notes && ! is_strip && ! strip_section_headers) non_fatal (_("%s: Could not find any mergeable note sections"), bfd_get_filename (ibfd)); @@ -4759,6 +4781,9 @@ strip_main (int argc, char *argv[]) case OPTION_REMOVE_RELOCS: handle_remove_relocations_option (optarg); break; + case OPTION_STRIP_SECTION_HEADERS: + strip_section_headers = true; + break; case 's': strip_symbols = STRIP_ALL; break; @@ -5228,6 +5253,10 @@ copy_main (int argc, char *argv[]) handle_remove_relocations_option (optarg); break; + case OPTION_STRIP_SECTION_HEADERS: + strip_section_headers = true; + break; + case 'S': strip_symbols = STRIP_ALL; break; |