binutils/
200x-xx-xx Phil Edwards <phil@codesourcery.com> Richard Sandiford <richard@codesourcery.com> * NEWS: Mention addition of --extract-symbol. * doc/binutils.texi: Document it. * objcopy.c (extract_symbol): New variable. (OPTION_EXTRACT_SYMBOLS): New command_line_switch. (copy_options): Add an entry for --extract-symbol. (copy_usage): Mention --extract-symbol. (copy_object): Set the start address to zero for --extract-symbol. Do not copy private BFD data in that case. (setup_section): Set the size, LMA and VMA to zero for --extract-symbol. Do not copy private BFD data in that case. (copy_section): Do not copy section contents if --extract-symbol is passed. (copy_main): Set extract_symbol to TRUE if --extract-symbol is passed. ld/testsuite/ * ld-elf/extract-symbol-1sym.d, ld-elf/extract-symbol-1sec.d, * ld-elf/extract-symbol-1.s, ld-elf/extract-symbol-1.ld: New tests. * ld-elf/binutils.exp: Run them.
This commit is contained in:
Richard Sandiford
parent
336becc779
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@ -1,3 +1,21 @@
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2007-03-01 Phil Edwards <phil@codesourcery.com>
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Richard Sandiford <richard@codesourcery.com>
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* NEWS: Mention addition of --extract-symbol.
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* doc/binutils.texi: Document it.
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* objcopy.c (extract_symbol): New variable.
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(OPTION_EXTRACT_SYMBOLS): New command_line_switch.
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(copy_options): Add an entry for --extract-symbol.
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(copy_usage): Mention --extract-symbol.
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(copy_object): Set the start address to zero for --extract-symbol.
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Do not copy private BFD data in that case.
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(setup_section): Set the size, LMA and VMA to zero for
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--extract-symbol. Do not copy private BFD data in that case.
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(copy_section): Do not copy section contents if --extract-symbol
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is passed.
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(copy_main): Set extract_symbol to TRUE if --extract-symbol
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is passed.
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2007-03-01 Paul Brook <paul@codesourcery.com>
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* MAINTAINERS: Update my entry.
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@ -1,5 +1,10 @@
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-*- text -*-
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* Add --extract-symbol command line option to objcopy, which will
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strip everything out of an ordinary object file or executable except
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for its symbol table. Files containing just symbols can be useful
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to some OSes.
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* Add "-x NAME" to readelf in addition to "-x NUMBER".
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* Add -i and -t switches to cxxfilt. -i disables the display of implementation
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@ -996,6 +996,7 @@ objcopy [@option{-F} @var{bfdname}|@option{--target=}@var{bfdname}]
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[@option{--add-gnu-debuglink=}@var{path-to-file}]
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[@option{--keep-file-symbols}]
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[@option{--only-keep-debug}]
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[@option{--extract-symbol}]
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[@option{--writable-text}]
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[@option{--readonly-text}]
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[@option{--pure}]
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@ -1489,6 +1490,21 @@ currently only supports the presence of one filename containing
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debugging information, not multiple filenames on a one-per-object-file
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basis.
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@item --extract-symbol
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Keep the file's section flags and symbols but remove all section data.
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Specifically, the option:
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@itemize
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@item sets the virtual and load addresses of every section to zero;
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@item removes the contents of all sections;
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@item sets the size of every section to zero; and
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@item sets the file's start address to zero.
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@end itemize
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This option is used to build a @file{.sym} file for a VxWorks kernel.
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It can also be a useful way of reducing the size of a @option{--just-symbols}
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linker input file.
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@item -V
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@itemx --version
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Show the version number of @command{objcopy}.
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@ -215,6 +215,9 @@ static char *prefix_symbols_string = 0;
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static char *prefix_sections_string = 0;
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static char *prefix_alloc_sections_string = 0;
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/* True if --extract-symbol was passed on the command line. */
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static bfd_boolean extract_symbol = FALSE;
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/* 150 isn't special; it's just an arbitrary non-ASCII char value. */
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enum command_line_switch
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{
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@ -261,7 +264,8 @@ enum command_line_switch
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OPTION_READONLY_TEXT,
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OPTION_WRITABLE_TEXT,
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OPTION_PURE,
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OPTION_IMPURE
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OPTION_IMPURE,
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OPTION_EXTRACT_SYMBOL
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};
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/* Options to handle if running as "strip". */
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@ -317,6 +321,7 @@ static struct option copy_options[] =
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{"debugging", no_argument, 0, OPTION_DEBUGGING},
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{"discard-all", no_argument, 0, 'x'},
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{"discard-locals", no_argument, 0, 'X'},
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{"extract-symbol", no_argument, 0, OPTION_EXTRACT_SYMBOL},
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{"format", required_argument, 0, 'F'}, /* Obsolete */
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{"gap-fill", required_argument, 0, OPTION_GAP_FILL},
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{"globalize-symbol", required_argument, 0, OPTION_GLOBALIZE_SYMBOL},
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@ -431,6 +436,7 @@ copy_usage (FILE *stream, int exit_status)
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Do not copy symbol <name> unless needed by\n\
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relocations\n\
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--only-keep-debug Strip everything but the debug information\n\
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--extract-symbol Remove section contents but keep symbols\n\
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-K --keep-symbol <name> Do not strip symbol <name>\n\
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--keep-file-symbols Do not strip file symbol(s)\n\
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--localize-hidden Turn all ELF hidden symbols into locals\n\
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@ -1310,11 +1316,16 @@ copy_object (bfd *ibfd, bfd *obfd)
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bfd_get_archive_filename (ibfd), bfd_get_target (ibfd),
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bfd_get_filename (obfd), bfd_get_target (obfd));
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if (set_start_set)
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start = set_start;
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if (extract_symbol)
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start = 0;
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else
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start = bfd_get_start_address (ibfd);
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start += change_start;
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{
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if (set_start_set)
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start = set_start;
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else
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start = bfd_get_start_address (ibfd);
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start += change_start;
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}
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/* Neither the start address nor the flags
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need to be set for a core file. */
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@ -1725,6 +1736,11 @@ copy_object (bfd *ibfd, bfd *obfd)
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}
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}
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/* Do not copy backend data if --extract-symbol is passed; anything
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that needs to look at the section contents will fail. */
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if (extract_symbol)
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return TRUE;
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/* Allow the BFD backend to copy any private data it understands
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from the input BFD to the output BFD. This is done last to
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permit the routine to look at the filtered symbol table, which is
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@ -2184,6 +2200,8 @@ setup_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
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size = bfd_section_size (ibfd, isection);
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if (copy_byte >= 0)
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size = (size + interleave - 1) / interleave;
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else if (extract_symbol)
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size = 0;
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if (! bfd_set_section_size (obfd, osection, size))
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{
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err = _("size");
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@ -2198,7 +2216,7 @@ setup_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
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else
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vma += change_section_address;
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if (! bfd_set_section_vma (obfd, osection, vma))
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if (! bfd_set_section_vma (obfd, osection, extract_symbol ? 0 : vma))
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{
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err = _("vma");
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goto loser;
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@ -2217,7 +2235,7 @@ setup_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
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else
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lma += change_section_address;
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osection->lma = lma;
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osection->lma = extract_symbol ? 0 : lma;
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/* FIXME: This is probably not enough. If we change the LMA we
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may have to recompute the header for the file as well. */
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@ -2236,7 +2254,12 @@ setup_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
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bfd_get_section_by_name since some formats allow multiple
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sections with the same name. */
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isection->output_section = osection;
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isection->output_offset = 0;
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isection->output_offset = extract_symbol ? vma : 0;
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/* Do not copy backend data if --extract-symbol is passed; anything
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that needs to look at the section contents will fail. */
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if (extract_symbol)
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return;
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/* Allow the BFD backend to copy any private data it understands
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from the input section to the output section. */
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@ -2354,6 +2377,9 @@ copy_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
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free (relpp);
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}
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if (extract_symbol)
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return;
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if (bfd_get_section_flags (ibfd, isection) & SEC_HAS_CONTENTS
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&& bfd_get_section_flags (obfd, osection) & SEC_HAS_CONTENTS)
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{
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@ -3231,6 +3257,10 @@ copy_main (int argc, char *argv[])
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bfd_flags_to_set &= ~D_PAGED;
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break;
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case OPTION_EXTRACT_SYMBOL:
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extract_symbol = TRUE;
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break;
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case 0:
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/* We've been given a long option. */
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break;
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@ -1,3 +1,9 @@
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2007-03-01 Richard Sandiford <richard@codesourcery.com>
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* ld-elf/extract-symbol-1sym.d, ld-elf/extract-symbol-1sec.d,
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* ld-elf/extract-symbol-1.s, ld-elf/extract-symbol-1.ld: New tests.
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* ld-elf/binutils.exp: Run them.
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2007-02-28 Nick Clifton <nickc@redhat.com>
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PR ld/3796
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@ -122,3 +122,6 @@ binutils_test objcopy "-z max-page-size=0x100000" tdata2
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binutils_test objcopy "" tdata2
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binutils_test objcopy "-shared" tdata2
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binutils_test objcopy "-z max-page-size=0x100000 -z common-page-size=0x1000" tdata2
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run_dump_test extract-symbol-1sec
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run_dump_test extract-symbol-1sym
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@ -0,0 +1,18 @@
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ENTRY(_entry)
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PHDRS
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{
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data PT_LOAD;
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}
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SECTIONS
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{
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. = 0x10000;
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.foo : { *(.foo) } :data
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. = 0x20000;
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.bar : { *(.bar) } :data
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/DISCARD/ : { *(*) }
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_entry = 0x30000;
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linker_symbol = 0x40000;
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}
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@ -0,0 +1,15 @@
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.globl B
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.globl C
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.section .foo,"awx",%progbits
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.4byte 1,2,3,4
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B:
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.4byte 5,6,7
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.section .bar,"ax",%nobits
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.space 0x123
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C:
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.space 0x302
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.globl D
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.equ D,0x12345678
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@ -0,0 +1,12 @@
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#name: --extract-symbol test 1 (sections)
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#source: extract-symbol-1.s
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#ld: -Textract-symbol-1.ld
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#objcopy_linked_file: --extract-symbol
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#objdump: --headers
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#...
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Sections:
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*Idx +Name +Size +VMA +LMA .*
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*0 +\.foo +0+ +0+ +0+ .*
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*CONTENTS, ALLOC, LOAD, CODE
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*1 +\.bar +0+ +0+ +0+ .*
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*ALLOC, READONLY, CODE
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@ -0,0 +1,10 @@
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#name: --extract-symbol test 1 (symbols)
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#source: extract-symbol-1.s
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#ld: -Textract-symbol-1.ld
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#objcopy_linked_file: --extract-symbol
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#nm: -n
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0*00010010 T B
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0*00020123 T C
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0*00030000 A _entry
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0*00040000 A linker_symbol
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0*12345678 A D
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