Correct -z text and other -z documentation
-z text applies to all dynamic binaries, not just shared libraries. A lot of the other options needed attention too. * ld.texinfo (-z): Combine negative options with corresponding positive option. Sort the table. Expand and correct "combreloc", "common", "common-page-size", "interpose", "loadfltr", "max-page-size", "muldefs", "nodefaultlib", "nodelete", "nodlopen", "nodump", "noextern-protected-data", "now", "origin", and "text".
This commit is contained in:
Alan Modra
parent
83d5a34dd4
commit
e6e2dfbdc1
@ -1,3 +1,11 @@
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2017-10-17 Alan Modra <amodra@gmail.com>
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* ld.texinfo (-z): Combine negative options with corresponding
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positive option. Sort the table. Expand and correct "combreloc",
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"common", "common-page-size", "interpose", "loadfltr",
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"max-page-size", "muldefs", "nodefaultlib", "nodelete", "nodlopen",
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"nodump", "noextern-protected-data", "now", "origin", and "text".
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2017-10-16 H.J. Lu <hongjiu.lu@intel.com>
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* emulparams/elf32_x86_64.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
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263
ld/ld.texinfo
263
ld/ld.texinfo
@ -1116,18 +1116,50 @@ for Solaris compatibility.
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The recognized keywords are:
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@table @samp
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@item bndplt
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Always generate BND prefix in PLT entries. Supported for Linux/x86_64.
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@item call-nop=prefix-addr
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@itemx call-nop=suffix-nop
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@itemx call-nop=prefix-@var{byte}
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@itemx call-nop=suffix-@var{byte}
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Specify the 1-byte @code{NOP} padding when transforming indirect call
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to a locally defined function, foo, via its GOT slot.
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@option{call-nop=prefix-addr} generates @code{0x67 call foo}.
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@option{call-nop=suffix-nop} generates @code{call foo 0x90}.
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@option{call-nop=prefix-@var{byte}} generates @code{@var{byte} call foo}.
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@option{call-nop=suffix-@var{byte}} generates @code{call foo @var{byte}}.
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Supported for i386 and x86_64.
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@item combreloc
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Combines multiple reloc sections and sorts them to make dynamic symbol
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lookup caching possible.
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@itemx nocombreloc
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Combine multiple dynamic relocation sections and sort to improve
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dynamic symbol lookup caching. Do not do this if @samp{nocombreloc}.
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@item common
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Generate common symbols with the STT_COMMON type druing a relocatable
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link.
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@itemx nocommon
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Generate common symbols with STT_COMMON type during a relocatable
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link. Use STT_OBJECT type if @samp{nocommon}.
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@item common-page-size=@var{value}
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Set the page size most commonly used to @var{value}. Memory image
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layout will be optimized to minimize memory pages if the system is
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using pages of this size.
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@item defs
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Disallows undefined symbols in object files. Undefined symbols in
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shared libraries are still allowed.
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@item dynamic-undefined-weak
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@itemx nodynamic-undefined-weak
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Make undefined weak symbols dynamic when building a dynamic object,
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if they are referenced from a regular object file and not forced local
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by symbol visibility or versioning. Do not make them dynamic if
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@samp{nodynamic-undefined-weak}. If neither option is given, a target
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may default to either option being in force, or make some other
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selection of undefined weak symbols dynamic. Not all targets support
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these options.
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@item execstack
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Marks the object as requiring executable stack.
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@ -1144,138 +1176,6 @@ tag. Global auditing requires that any auditing library defined via
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the @option{--depaudit} or @option{-P} command line options be run for
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all dynamic objects loaded by the application.
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@item initfirst
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This option is only meaningful when building a shared object.
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It marks the object so that its runtime initialization will occur
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before the runtime initialization of any other objects brought into
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the process at the same time. Similarly the runtime finalization of
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the object will occur after the runtime finalization of any other
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objects.
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@item interpose
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Marks the object that its symbol table interposes before all symbols
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but the primary executable.
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@item lazy
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When generating an executable or shared library, mark it to tell the
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dynamic linker to defer function call resolution to the point when
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the function is called (lazy binding), rather than at load time.
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Lazy binding is the default.
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@item loadfltr
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Marks the object that its filters be processed immediately at
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runtime.
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@item muldefs
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Allows multiple definitions.
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@item nocombreloc
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Disables multiple reloc sections combining.
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@item nocommon
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Generate common symbols with the STT_OBJECT type druing a relocatable
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link.
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@item nocopyreloc
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Disable linker generated .dynbss variables used in place of variables
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defined in shared libraries. May result in dynamic text relocations.
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@item nodefaultlib
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Marks the object that the search for dependencies of this object will
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ignore any default library search paths.
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@item nodelete
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Marks the object shouldn't be unloaded at runtime.
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@item nodlopen
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Marks the object not available to @code{dlopen}.
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@item nodump
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Marks the object can not be dumped by @code{dldump}.
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@item noexecstack
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Marks the object as not requiring executable stack.
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@item text
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Treat DT_TEXTREL in shared object as error.
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@item notext
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Don't treat DT_TEXTREL in shared object as error.
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@item textoff
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Don't treat DT_TEXTREL in shared object as error.
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@item norelro
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Don't create an ELF @code{PT_GNU_RELRO} segment header in the object.
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@item now
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When generating an executable or shared library, mark it to tell the
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dynamic linker to resolve all symbols when the program is started, or
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when the shared library is linked to using dlopen, instead of
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deferring function call resolution to the point when the function is
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first called.
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@item origin
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Marks the object may contain $ORIGIN.
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@item relro
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Create an ELF @code{PT_GNU_RELRO} segment header in the object. This
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specifies a memory segment that should be made read-only after
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relocation, if supported. Specifying @samp{common-page-size} smaller
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than the system page size will render this protection ineffective.
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@item max-page-size=@var{value}
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Set the emulation maximum page size to @var{value}.
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@item common-page-size=@var{value}
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Set the emulation common page size to @var{value}.
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@item stack-size=@var{value}
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Specify a stack size for in an ELF @code{PT_GNU_STACK} segment.
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Specifying zero will override any default non-zero sized
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@code{PT_GNU_STACK} segment creation.
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@item bndplt
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Always generate BND prefix in PLT entries. Supported for Linux/x86_64.
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@item noextern-protected-data
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Don't treat protected data symbol as external when building shared
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library. This option overrides linker backend default. It can be used
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to workaround incorrect relocations against protected data symbols
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generated by compiler. Updates on protected data symbols by another
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module aren't visible to the resulting shared library. Supported for
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i386 and x86-64.
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@item dynamic-undefined-weak
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Make undefined weak symbols dynamic when building a dynamic object,
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if they are referenced from a regular object file and not forced local
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by symbol visibility or versioning. Not all targets support this
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option.
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@item nodynamic-undefined-weak
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Do not make undefined weak symbols dynamic when building a dynamic
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object. Not all targets support this option. If neither
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@option{-z nodynamic-undefined-weak} nor @option{-z dynamic-undefined-weak}
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are given, a target may default to either option being in force, or
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make some other selection of undefined weak symbols dynamic.
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@item noreloc-overflow
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Disable relocation overflow check. This can be used to disable
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relocation overflow check if there will be no dynamic relocation
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overflow at run-time. Supported for x86_64.
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@item call-nop=prefix-addr
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@itemx call-nop=suffix-nop
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@itemx call-nop=prefix-@var{byte}
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@itemx call-nop=suffix-@var{byte}
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Specify the 1-byte @code{NOP} padding when transforming indirect call
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to a locally defined function, foo, via its GOT slot.
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@option{call-nop=prefix-addr} generates @code{0x67 call foo}.
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@option{call-nop=suffix-nop} generates @code{call foo 0x90}.
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@option{call-nop=prefix-@var{byte}} generates @code{@var{byte} call foo}.
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@option{call-nop=suffix-@var{byte}} generates @code{call foo @var{byte}}.
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Supported for i386 and x86_64.
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@item ibtplt
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Generate Intel Indirect Branch Tracking (IBT) enabled PLT entries.
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Supported for Linux/i386 and Linux/x86_64.
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@ -1285,11 +1185,102 @@ Generate GNU_PROPERTY_X86_FEATURE_1_IBT in .note.gnu.property section
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to indicate compatibility with IBT. This also implies @option{ibtplt}.
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Supported for Linux/i386 and Linux/x86_64.
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@item initfirst
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This option is only meaningful when building a shared object.
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It marks the object so that its runtime initialization will occur
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before the runtime initialization of any other objects brought into
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the process at the same time. Similarly the runtime finalization of
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the object will occur after the runtime finalization of any other
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objects.
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@item interpose
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Specify that the dynamic loader should modify its symbol search order
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so that symbols in this shared library interpose all other shared
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libraries not so marked.
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@item lazy
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When generating an executable or shared library, mark it to tell the
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dynamic linker to defer function call resolution to the point when
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the function is called (lazy binding), rather than at load time.
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Lazy binding is the default.
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@item loadfltr
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Specify that the object's filters be processed immediately at runtime.
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@item max-page-size=@var{value}
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Set the maximum memory page size supported to @var{value}.
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@item muldefs
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Allow multiple definitions.
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@item nocopyreloc
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Disable linker generated .dynbss variables used in place of variables
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defined in shared libraries. May result in dynamic text relocations.
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@item nodefaultlib
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Specify that the dynamic loader search for dependencies of this object
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should ignore any default library search paths.
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@item nodelete
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Specify that the object shouldn't be unloaded at runtime.
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@item nodlopen
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Specify that the object is not available to @code{dlopen}.
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@item nodump
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Specify that the object can not be dumped by @code{dldump}.
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@item noexecstack
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Marks the object as not requiring executable stack.
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@item noextern-protected-data
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Don't treat protected data symbols as external when building a shared
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library. This option overrides the linker backend default. It can be
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used to work around incorrect relocations against protected data symbols
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generated by compiler. Updates on protected data symbols by another
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module aren't visible to the resulting shared library. Supported for
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i386 and x86-64.
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@item noreloc-overflow
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Disable relocation overflow check. This can be used to disable
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relocation overflow check if there will be no dynamic relocation
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overflow at run-time. Supported for x86_64.
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@item now
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When generating an executable or shared library, mark it to tell the
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dynamic linker to resolve all symbols when the program is started, or
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when the shared library is loaded by dlopen, instead of deferring
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function call resolution to the point when the function is first
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called.
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@item origin
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Specify that the object requires @samp{$ORIGIN} handling in paths.
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@item relro
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@itemx norelro
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Create an ELF @code{PT_GNU_RELRO} segment header in the object. This
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specifies a memory segment that should be made read-only after
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relocation, if supported. Specifying @samp{common-page-size} smaller
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than the system page size will render this protection ineffective.
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Don't create an ELF @code{PT_GNU_RELRO} segment if @samp{norelro}.
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@item shstk
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Generate GNU_PROPERTY_X86_FEATURE_1_SHSTK in .note.gnu.property section
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to indicate compatibility with Intel Shadow Stack. Supported for
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Linux/i386 and Linux/x86_64.
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@item stack-size=@var{value}
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Specify a stack size for an ELF @code{PT_GNU_STACK} segment.
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Specifying zero will override any default non-zero sized
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@code{PT_GNU_STACK} segment creation.
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@item text
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@itemx notext
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@itemx textoff
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Report an error if DT_TEXTREL is set, i.e., if the binary has dynamic
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relocations in read-only sections. Don't report an error if
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@samp{notext} or @samp{textoff}.
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@end table
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Other keywords are ignored for Solaris compatibility.
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