Author: emaste
Date: Tue Oct 2 22:51:24 2018
New Revision: 339100
URL: https://svnweb.freebsd.org/changeset/base/339100
Log:
MFC r338682: lld: add -z interpose support
-z interpose sets the DF_1_INTERPOSE flag, marking the object as an
interposer.
PR: 230604
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Modified:
stable/11/contrib/llvm/tools/lld/ELF/Config.h
stable/11/contrib/llvm/tools/lld/ELF/Driver.cpp
stable/11/contrib/llvm/tools/lld/ELF/SyntheticSections.cpp
stable/11/usr.bin/clang/lld/ld.lld.1
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/contrib/llvm/tools/lld/ELF/Config.h
==============================================================================
--- stable/11/contrib/llvm/tools/lld/ELF/Config.h Tue Oct 2 21:40:57
2018 (r339099)
+++ stable/11/contrib/llvm/tools/lld/ELF/Config.h Tue Oct 2 22:51:24
2018 (r339100)
@@ -153,6 +153,7 @@ struct Configuration {
bool ZExecstack;
bool ZHazardplt;
bool ZIfuncnoplt;
+ bool ZInterpose;
bool ZNocopyreloc;
bool ZNodelete;
bool ZNodlopen;
Modified: stable/11/contrib/llvm/tools/lld/ELF/Driver.cpp
==============================================================================
--- stable/11/contrib/llvm/tools/lld/ELF/Driver.cpp Tue Oct 2 21:40:57
2018 (r339099)
+++ stable/11/contrib/llvm/tools/lld/ELF/Driver.cpp Tue Oct 2 22:51:24
2018 (r339100)
@@ -670,6 +670,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args
Config->ZExecstack = hasZOption(Args, "execstack");
Config->ZHazardplt = hasZOption(Args, "hazardplt");
Config->ZIfuncnoplt = hasZOption(Args, "ifunc-noplt");
+ Config->ZInterpose = hasZOption(Args, "interpose");
Config->ZNocopyreloc = hasZOption(Args, "nocopyreloc");
Config->ZNodelete = hasZOption(Args, "nodelete");
Config->ZNodlopen = hasZOption(Args, "nodlopen");
Modified: stable/11/contrib/llvm/tools/lld/ELF/SyntheticSections.cpp
==============================================================================
--- stable/11/contrib/llvm/tools/lld/ELF/SyntheticSections.cpp Tue Oct 2
21:40:57 2018 (r339099)
+++ stable/11/contrib/llvm/tools/lld/ELF/SyntheticSections.cpp Tue Oct 2
22:51:24 2018 (r339100)
@@ -1034,6 +1034,8 @@ template <class ELFT> void DynamicSection<ELFT>::final
uint32_t DtFlags1 = 0;
if (Config->Bsymbolic)
DtFlags |= DF_SYMBOLIC;
+ if (Config->ZInterpose)
+ DtFlags1 |= DF_1_INTERPOSE;
if (Config->ZNodelete)
DtFlags1 |= DF_1_NODELETE;
if (Config->ZNodlopen)
Modified: stable/11/usr.bin/clang/lld/ld.lld.1
==============================================================================
--- stable/11/usr.bin/clang/lld/ld.lld.1 Tue Oct 2 21:40:57 2018
(r339099)
+++ stable/11/usr.bin/clang/lld/ld.lld.1 Tue Oct 2 22:51:24 2018
(r339100)
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd August 22, 2018
+.Dd September 14, 2018
.Dt LD.LLD 1
.Os
.Sh NAME
@@ -450,6 +450,12 @@ be applied by a run-time loader.
Note that this feature requires special loader support and will
generally result in application crashes when used outside of freestanding
environments.
+.It Cm interpose
+Set the
+.Dv DF_1_INTERPOSE
+flag to indicate that the object is an interposer.
+Runtime linkers perform symbol resolution by first searching the application,
+followed by interposers, and then any other dependencies.
.It Cm muldefs
Do not error if a symbol is defined multiple times.
The first definition will be used.
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