[ELF] Tidy up handleARMTlsRelocation [NFC]

smithp35 · smithp35 · commit 4dc4bc4e3c8c · 2017-04-13T10:56:40.000Z
Replace addModuleReloc with AddTlsReloc so that we can use it for both the module relocation and the offset relocation. Differential Revision: https://reviews.llvm.org/D31751 llvm-svn: 300192
diff --git a/lld/ELF/Relocations.cpp b/lld/ELF/Relocations.cpp
@@ -147,25 +147,27 @@ template <class ELFT>
 static unsigned handleARMTlsRelocation(uint32_t Type, SymbolBody &Body,
                                        InputSectionBase &C, uint64_t Offset,
                                        int64_t Addend, RelExpr Expr) {
-  auto addModuleReloc = [&](uint64_t Off, bool LD) {
-    // The Dynamic TLS Module Index Relocation can be statically resolved to 1
-    // if we know that the TLS Symbol is in an executable.
-    if (!Body.isPreemptible() && !Config->Pic)
-      In<ELFT>::Got->Relocations.push_back(
-          {R_ABS, Target->TlsModuleIndexRel, Off, 0, &Body});
-    else {
-      SymbolBody *Dest = LD ? nullptr : &Body;
-      In<ELFT>::RelaDyn->addReloc(
-          {Target->TlsModuleIndexRel, In<ELFT>::Got, Off, false, Dest, 0});
-    }
+  // The Dynamic TLS Module Index Relocation for a symbol defined in an
+  // executable is always 1. If the target Symbol is not preemtible then
+  // we know the offset into the TLS block at static link time.
+  bool NeedDynId = Body.isPreemptible() || Config->Shared;
+  bool NeedDynOff = Body.isPreemptible();
+
+  auto AddTlsReloc = [&](uint64_t Off, uint32_t Type, SymbolBody *Dest,
+                         bool Dyn) {
+    if (Dyn)
+      In<ELFT>::RelaDyn->addReloc({Type, In<ELFT>::Got, Off, false, Dest, 0});
+    else
+      In<ELFT>::Got->Relocations.push_back({R_ABS, Type, Off, 0, Dest});
   };
 
   // Local Dynamic is for access to module local TLS variables, while still
   // being suitable for being dynamically loaded via dlopen.
   // GOT[e0] is the module index, with a special value of 0 for the current
   // module. GOT[e1] is unused. There only needs to be one module index entry.
   if (Expr == R_TLSLD_PC && In<ELFT>::Got->addTlsIndex()) {
-    addModuleReloc(In<ELFT>::Got->getTlsIndexOff(), true);
+    AddTlsReloc(In<ELFT>::Got->getTlsIndexOff(), Target->TlsModuleIndexRel,
+                NeedDynId ? nullptr : &Body, NeedDynId);
     C.Relocations.push_back({Expr, Type, Offset, Addend, &Body});
     return 1;
   }
@@ -176,13 +178,9 @@ static unsigned handleARMTlsRelocation(uint32_t Type, SymbolBody &Body,
   if (Expr == R_TLSGD_PC) {
     if (In<ELFT>::Got->addDynTlsEntry(Body)) {
       uint64_t Off = In<ELFT>::Got->getGlobalDynOffset(Body);
-      addModuleReloc(Off, false);
-      if (Body.isPreemptible())
-        In<ELFT>::RelaDyn->addReloc({Target->TlsOffsetRel, In<ELFT>::Got,
-                                     Off + Config->Wordsize, false, &Body, 0});
-      else
-        In<ELFT>::Got->Relocations.push_back(
-            {R_ABS, R_ARM_ABS32, Off + Config->Wordsize, 0, &Body});
+      AddTlsReloc(Off, Target->TlsModuleIndexRel, &Body, NeedDynId);
+      AddTlsReloc(Off + Config->Wordsize, Target->TlsOffsetRel, &Body,
+                  NeedDynOff);
     }
     C.Relocations.push_back({Expr, Type, Offset, Addend, &Body});
     return 1;
diff --git a/lld/ELF/Target.cpp b/lld/ELF/Target.cpp
@@ -1874,6 +1874,7 @@ void ARMTargetInfo::relocateOne(uint8_t *Loc, uint32_t Type,
   case R_ARM_TLS_LDO32:
   case R_ARM_TLS_LE32:
   case R_ARM_TLS_TPOFF32:
+  case R_ARM_TLS_DTPOFF32:
     write32le(Loc, Val);
     break;
   case R_ARM_TLS_DTPMOD32:
