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authorA. Wilcox <AWilcox@Wilcox-Tech.com>2018-10-06 02:28:40 +0000
committerA. Wilcox <AWilcox@Wilcox-Tech.com>2018-10-06 02:28:40 +0000
commitae6c7d2be3c39179a93f89df0c1e819a753b7d32 (patch)
tree8b9f529fbef573a0503f347ecaa9f0516a606ad2 /user/llvm6/even-more-secure-plt.patch
parentd439e25930da0f3135dfefff7a96389116af0f02 (diff)
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user/llvm6: even more Secure PLT work on PPC32
Diffstat (limited to 'user/llvm6/even-more-secure-plt.patch')
-rw-r--r--user/llvm6/even-more-secure-plt.patch101
1 files changed, 101 insertions, 0 deletions
diff --git a/user/llvm6/even-more-secure-plt.patch b/user/llvm6/even-more-secure-plt.patch
new file mode 100644
index 000000000..112e111b8
--- /dev/null
+++ b/user/llvm6/even-more-secure-plt.patch
@@ -0,0 +1,101 @@
+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