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path: root/user/llvm8/even-more-secure-plt.patch
blob: 112e111b81ca5428424cebf2a1b121bffa619879 (plain) (tree)



































































































                                                                                                                                        
Index: lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
===================================================================
--- a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
+++ b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
@@ -442,13 +442,22 @@
   // On PPC64, VariantKind is VK_None, but on PPC32, it's VK_PLT, and it must
   // come at the _end_ of the expression.
   const MCOperand &Op = MI->getOperand(OpNo);
-  const MCSymbolRefExpr &refExp = cast<MCSymbolRefExpr>(*Op.getExpr());
-  O << refExp.getSymbol().getName();
+  const MCSymbolRefExpr *RefExp = nullptr;
+  const MCConstantExpr *ConstExp = nullptr;
+  if (const MCBinaryExpr *BinExpr = dyn_cast<MCBinaryExpr>(Op.getExpr())) {
+    RefExp = cast<MCSymbolRefExpr>(BinExpr->getLHS());
+    ConstExp = cast<MCConstantExpr>(BinExpr->getRHS());
+  } else
+    RefExp = cast<MCSymbolRefExpr>(Op.getExpr());
+
+  O << RefExp->getSymbol().getName();
   O << '(';
   printOperand(MI, OpNo+1, O);
   O << ')';
-  if (refExp.getKind() != MCSymbolRefExpr::VK_None)
-    O << '@' << MCSymbolRefExpr::getVariantKindName(refExp.getKind());
+  if (RefExp->getKind() != MCSymbolRefExpr::VK_None)
+    O << '@' << MCSymbolRefExpr::getVariantKindName(RefExp->getKind());
+  if (ConstExp != nullptr)
+    O << '+' << ConstExp->getValue();
 }
 
 /// showRegistersWithPercentPrefix - Check if this register name should be
Index: lib/Target/PowerPC/PPCAsmPrinter.cpp
===================================================================
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -487,8 +487,14 @@
   if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
       isPositionIndependent())
     Kind = MCSymbolRefExpr::VK_PLT;
-  const MCSymbolRefExpr *TlsRef =
+  const MCExpr *TlsRef =
     MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
+
+  // Add 32768 offset to the symbol so we follow up the latest GOT/PLT ABI.
+  if (Kind == MCSymbolRefExpr::VK_PLT && Subtarget->isSecurePlt())
+    TlsRef = MCBinaryExpr::createAdd(TlsRef,
+                                     MCConstantExpr::create(32768, OutContext),
+                                     OutContext);
   const MachineOperand &MO = MI->getOperand(2);
   const GlobalValue *GValue = MO.getGlobal();
   MCSymbol *MOSymbol = getSymbol(GValue);
Index: lib/Target/PowerPC/PPCISelDAGToDAG.cpp
===================================================================
--- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -4054,7 +4054,20 @@
     if (trySETCC(N))
       return;
     break;
-
+  // These nodes will be transformed into GETtlsADDR32 node, which
+  // later becomes BL_TLS __tls_get_addr(sym at tlsgd)@PLT
+  case PPCISD::ADDI_TLSLD_L_ADDR:
+  case PPCISD::ADDI_TLSGD_L_ADDR: {
+    const Module *Mod = MF->getFunction().getParent();
+    if (PPCLowering->getPointerTy(CurDAG->getDataLayout()) != MVT::i32 ||
+        !PPCSubTarget->isSecurePlt() || !PPCSubTarget->isTargetELF() ||
+        Mod->getPICLevel() == PICLevel::SmallPIC)
+      break;
+      // Attach global base pointer on GETtlsADDR32 node in order to
+      // generate secure plt code for TLS symbols.
+      getGlobalBaseReg();
+  }
+    break;
   case PPCISD::CALL: {
     const Module *M = MF->getFunction().getParent();
 
Index: test/CodeGen/PowerPC/ppc32-secure-plt-tls.ll
===================================================================
--- a/test/CodeGen/PowerPC/ppc32-secure-plt-tls.ll
+++ b/test/CodeGen/PowerPC/ppc32-secure-plt-tls.ll
@@ -0,0 +1,18 @@
+; RUN: llc < %s -mtriple=powerpc-unknown-linux-gnu -mattr=+secure-plt -relocation-model=pic | FileCheck -check-prefix=SECURE-PLT-TLS %s
+
+@a = thread_local local_unnamed_addr global i32 6, align 4
+define i32 @main() local_unnamed_addr #0 {
+entry:
+  %0 = load i32, i32* @a, align 4
+  ret i32 %0
+}
+
+
+!llvm.module.flags = !{!0}
+!0 = !{i32 7, !"PIC Level", i32 2}
+
+; SECURE-PLT-TLS:       mflr 30
+; SECURE-PLT-TLS-NEXT:  addis 30, 30, .LTOC-.L0$pb@ha
+; SECURE-PLT-TLS-NEXT:  addi 30, 30, .LTOC-.L0$pb@l
+; SECURE-PLT-TLS-NEXT:  bl .L{{.*}}
+; SECURE-PLT-TLS:       bl __tls_get_addr(a@tlsgd)@PLT+32768
\ No newline at end of file