diff options
author | Dimitry Andric <dim@FreeBSD.org> | 2018-08-24 17:48:05 +0000 |
---|---|---|
committer | Dimitry Andric <dim@FreeBSD.org> | 2018-08-24 17:48:05 +0000 |
commit | a0d1f778057429ec7272dc81c1b61211602b1fa0 (patch) | |
tree | eb5ec8dce140a92eb133905594db5e0b7c63d31f /contrib/llvm | |
parent | f42813cfc824645a86e6dd8316418c7958e220c5 (diff) | |
download | src-test2-a0d1f778057429ec7272dc81c1b61211602b1fa0.tar.gz src-test2-a0d1f778057429ec7272dc81c1b61211602b1fa0.zip |
Notes
Diffstat (limited to 'contrib/llvm')
-rw-r--r-- | contrib/llvm/tools/lld/ELF/Config.h | 1 | ||||
-rw-r--r-- | contrib/llvm/tools/lld/ELF/Driver.cpp | 4 | ||||
-rw-r--r-- | contrib/llvm/tools/lld/ELF/Relocations.cpp | 10 | ||||
-rw-r--r-- | contrib/llvm/tools/lld/ELF/Writer.cpp | 5 |
4 files changed, 17 insertions, 3 deletions
diff --git a/contrib/llvm/tools/lld/ELF/Config.h b/contrib/llvm/tools/lld/ELF/Config.h index 622324c13e2d..53f0852fa98f 100644 --- a/contrib/llvm/tools/lld/ELF/Config.h +++ b/contrib/llvm/tools/lld/ELF/Config.h @@ -181,6 +181,7 @@ struct Configuration { bool ZCopyreloc; bool ZExecstack; bool ZHazardplt; + bool ZIfuncnoplt; bool ZInitfirst; bool ZKeepTextSectionPrefix; bool ZNodelete; diff --git a/contrib/llvm/tools/lld/ELF/Driver.cpp b/contrib/llvm/tools/lld/ELF/Driver.cpp index 693dba64ab5a..b8be526d9424 100644 --- a/contrib/llvm/tools/lld/ELF/Driver.cpp +++ b/contrib/llvm/tools/lld/ELF/Driver.cpp @@ -338,7 +338,8 @@ static bool getZFlag(opt::InputArgList &Args, StringRef K1, StringRef K2, static bool isKnown(StringRef S) { return S == "combreloc" || S == "copyreloc" || S == "defs" || - S == "execstack" || S == "hazardplt" || S == "initfirst" || + S == "execstack" || S == "hazardplt" || S == "ifunc-noplt" || + S == "initfirst" || S == "keep-text-section-prefix" || S == "lazy" || S == "muldefs" || S == "nocombreloc" || S == "nocopyreloc" || S == "nodelete" || S == "nodlopen" || S == "noexecstack" || @@ -843,6 +844,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) { Config->ZCopyreloc = getZFlag(Args, "copyreloc", "nocopyreloc", true); Config->ZExecstack = getZFlag(Args, "execstack", "noexecstack", false); Config->ZHazardplt = hasZOption(Args, "hazardplt"); + Config->ZIfuncnoplt = hasZOption(Args, "ifunc-noplt"); Config->ZInitfirst = hasZOption(Args, "initfirst"); Config->ZKeepTextSectionPrefix = getZFlag( Args, "keep-text-section-prefix", "nokeep-text-section-prefix", false); diff --git a/contrib/llvm/tools/lld/ELF/Relocations.cpp b/contrib/llvm/tools/lld/ELF/Relocations.cpp index 467219ad0542..5d7896a1b632 100644 --- a/contrib/llvm/tools/lld/ELF/Relocations.cpp +++ b/contrib/llvm/tools/lld/ELF/Relocations.cpp @@ -366,6 +366,10 @@ static bool isStaticLinkTimeConstant(RelExpr E, RelType Type, const Symbol &Sym, R_TLSLD_HINT>(E)) return true; + // The computation involves output from the ifunc resolver. + if (Sym.isGnuIFunc() && Config->ZIfuncnoplt) + return false; + // These never do, except if the entire file is position dependent or if // only the low bits are used. if (E == R_GOT || E == R_PLT || E == R_TLSDESC) @@ -816,6 +820,10 @@ static void processRelocAux(InputSectionBase &Sec, RelExpr Expr, RelType Type, Sec.Relocations.push_back({Expr, Type, Offset, Addend, &Sym}); return; } + if (Sym.isGnuIFunc() && Config->ZIfuncnoplt) { + InX::RelaDyn->addReloc(Type, &Sec, Offset, &Sym, Addend, R_ADDEND, Type); + return; + } bool CanWrite = (Sec.Flags & SHF_WRITE) || !Config->ZText; if (CanWrite) { // R_GOT refers to a position in the got, even if the symbol is preemptible. @@ -985,7 +993,7 @@ static void scanReloc(InputSectionBase &Sec, OffsetGetter &GetOffset, RelTy *&I, // all dynamic symbols that can be resolved within the executable will // actually be resolved that way at runtime, because the main exectuable // is always at the beginning of a search list. We can leverage that fact. - if (Sym.isGnuIFunc()) + if (Sym.isGnuIFunc() && !Config->ZIfuncnoplt) Expr = toPlt(Expr); else if (!Sym.IsPreemptible && Expr == R_GOT_PC && !isAbsoluteValue(Sym)) Expr = Target->adjustRelaxExpr(Type, RelocatedAddr, Expr); diff --git a/contrib/llvm/tools/lld/ELF/Writer.cpp b/contrib/llvm/tools/lld/ELF/Writer.cpp index 88a2d5c71266..d9f445c29235 100644 --- a/contrib/llvm/tools/lld/ELF/Writer.cpp +++ b/contrib/llvm/tools/lld/ELF/Writer.cpp @@ -1561,8 +1561,11 @@ template <class ELFT> void Writer<ELFT>::finalizeSections() { applySynthetic({InX::EhFrame}, [](SyntheticSection *SS) { SS->finalizeContents(); }); - for (Symbol *S : Symtab->getSymbols()) + for (Symbol *S : Symtab->getSymbols()) { S->IsPreemptible |= computeIsPreemptible(*S); + if (S->isGnuIFunc() && Config->ZIfuncnoplt) + S->ExportDynamic = true; + } // Scan relocations. This must be done after every symbol is declared so that // we can correctly decide if a dynamic relocation is needed. |