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authorNick Clifton <nickc@redhat.com>2009-07-23 13:00:30 +0000
committerNick Clifton <nickc@redhat.com>2009-07-23 13:00:30 +0000
commit3e7a7d11f1106a451c26b49fcb8fafb5059fd684 (patch)
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parent6ec8e7022b6b6a69ee682d1797e8bfec473aae11 (diff)
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* config/obj-elf.c (obj_elf_type): Add code to support a type of
gnu_unique_object. * doc/as.texinfo: Document new feature of .type directive. * NEWS: Mention support for gnu_unique_object symbol type. * common.h (STB_GNU_UNIQUE): Define. * NEWS: Mention the linker's support for symbols with a binding of STB_GNU_UNIQUE. * gas/elf/type.s: Add unique global symbol definition. * gas/elf/type.e: Add expected readelf output for global unique symbol. * elfcpp.h (enum STB): Add STB_GNU_UNIQUE. * readelf.c (get_symbol_binding): For Linux targeted files return UNIQUE for symbols with the STB_GNU_UNIQUE binding. * doc/binutils.texi: Document the meaning of the 'u' symbol binding in the output of nm and objdump --syms. * elf-bfd.h (struct elf_link_hash_entry): Add unique_global field. * elf.c (swap_out_syms): Set binding to STB_GNU_UNIQUE for symbols with the BSF_GNU_UNIQUE flag bit set. * elfcode.h (elf_slurp_symbol_table): Set the BSF_GNU_UNIQUE flag for symbols with STB_GNU_UNIQUE binding. * elflink.c (_bfd_elf_merge_symbol): Set unique_global for symbols with the STB_GNU_UNIQUE binding. (elf_link_add_object_symbols): Set the BSF_GNU_UNIQUE flag for symbols with STB_GNU_UNIQUE binding. Set STB_GNU_UNIQUE for symbols with the unique_global field set. (elf_link_output_extsym): Set unique_global field for symbols with the STB_GNU_UNIQUE binding. * syms.c (struct bfd_symbol): Define BSF_GNU_UNIQUE flag bit. (bfd_print_symbol_vandf): Print a 'u' character for BSF_GNU_UNIQUE symbols. (bfd_decode_symclass): Return a 'u' character for BSF_GNU_UNIQUE symbols. * bfd-in2.h: Regenerate.
Diffstat (limited to 'gas/doc')
-rw-r--r--gas/doc/as.texinfo5
1 files changed, 5 insertions, 0 deletions
diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo
index d1240bf..3af86f8 100644
--- a/gas/doc/as.texinfo
+++ b/gas/doc/as.texinfo
@@ -6360,6 +6360,11 @@ Mark the symbol as being a common data object.
@itemx notype
Does not mark the symbol in any way. It is supported just for completeness.
+@item gnu_unique_object
+Marks the symbol as being a globally unique data object. The dynamic linker
+will make sure that in the entire process there is just one symbol with this
+name and type in use. (This is only supported on Linux targeted assemblers).
+
@end table
Note: Some targets support extra types in addition to those listed above.