Syminfo Table Section
The syminfo section contains multiple entries of the type
Elf32_Syminfo or Elf64_Syminfo. The
.SUNW_syminfo section contains one entry for every entry in the
associated symbol table (sh_link).
If this section is present in an object, additional symbol information is to be found by
taking the symbol index from the associated symbol table and using that to find the
corresponding Elf32_Syminfo entry or Elf64_Syminfo entry
in this section. The associated symbol table and the Syminfo table will
always have the same number of entries.
Index 0 is used to store the current version of the
Syminfo table, which is SYMINFO_CURRENT. Since symbol
table entry 0 is always reserved for the UNDEF symbol
table entry, this usage does not pose any conflicts.
An Syminfo entry has the following format. See
sys/link.h.
typedef struct {
Elf32_Half si_boundto;
Elf32_Half si_flags;
} Elf32_Syminfo;
typedef struct {
Elf64_Half si_boundto;
Elf64_Half si_flags;
} Elf64_Syminfo;
- si_boundto
-
An index to an entry in the .dynamic section, identified by the
sh_info field, which augments the
Syminfo flags. For example, a DT_NEEDED entry
identifies a dynamic object associated with the Syminfo entry. The
entries that follow are reserved values for
si_boundto.
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SYMINFO_BT_SELF
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0xffff
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Symbol bound to self.
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SYMINFO_BT_PARENT
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0xfffe
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Symbol bound to parent. The parent is the first object to cause this
dynamic object to be loaded.
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SYMINFO_BT_NONE
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0xfffd
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Symbol has no special symbol binding.
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SYMINFO_BT_EXTERN
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0xfffc
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Symbol definition is external.
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- si_flags
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This bit-field can have flags set, as shown in the following table.
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SYMINFO_FLG_DIRECT
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0x01
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Symbol reference has an association to the object containing the
definition.
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SYMINFO_FLG_FILTER
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0x02
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Symbol definition acts as a standard filter.
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SYMINFO_FLG_COPY
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0x04
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Symbol definition is the result of a copy-relocation.
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SYMINFO_FLG_LAZYLOAD
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0x08
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Symbol reference is to an object that should be lazily loaded.
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SYMINFO_FLG_DIRECTBIND
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0x10
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Symbol reference should be bound directly to the definition.
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SYMINFO_FLG_NOEXTDIRECT
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0x20
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Do not allow an external reference to directly bind to this symbol
definition.
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SYMINFO_FLG_AUXILIARY
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0x40
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Symbol definition acts as an auxiliary filter.
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SYMINFO_FLG_INTERPOSE
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0x80
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Symbol definition acts as an interposer. This attribute is only applicable
for executables.
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SYMINFO_FLG_CAP
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0x100
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Symbol is associated with capabilities.
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SYMINFO_FLG_DEFERRED
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0x200
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Symbol is associated with a deferred reference, and should not be included
in BIND_NOW relocations.
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SYMINFO_FLG_WEAKFILTER
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0x400
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Set in conjunction with SYMINFO_FLG_FILTER to specify a
weak standard filter. At runtime, the behavior is identical to
SYMINFO_FLG_FILTER. At link-edit time, if unused
dependency processing is active, a weak filter symbol can be ignored in favor
of the same symbol from the target filtee. See Generating Weak Filters |
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