Merging r325651:llvm_60-amp-20180630release_60-f1b37feef3d-amp-20180630

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r325651 | sdardis | 2018-02-21 00:05:05 +0000 (Wed, 21 Feb 2018) | 34 lines

[mips] Spectre variant two mitigation for MIPSR2

This patch provides mitigation for CVE-2017-5715, Spectre variant two,
which affects the P5600 and P6600. It provides the option
-mindirect-jump=hazard, which instructs the LLVM backend to replace
indirect branches with their hazard barrier variants.

This option is accepted when targeting MIPS revision two or later.

The migitation strategy suggested by MIPS for these processors is to
use two hazard barrier instructions. 'jalr.hb' and 'jr.hb' are hazard
barrier variants of the 'jalr' and 'jr' instructions respectively.

These instructions impede the execution of instruction stream until
architecturally defined hazards (changes to the instruction stream,
privileged registers which may affect execution) are cleared. These
instructions in MIPS' designs are not speculated past.

These instructions are used with the option -mindirect-jump=hazard
when branching indirectly and for indirect function calls.

These instructions are defined by the MIPS32R2 ISA, so this mitigation
method is not compatible with processors which implement an earlier
revision of the MIPS ISA.

Implementation note: I've opted to provide this as an
-mindirect-jump={hazard,...} style option in case alternative
mitigation methods are required for other implementations of the MIPS
ISA in future, e.g. retpoline style solutions.

Reviewers: atanasyan

Differential Revision: https://reviews.llvm.org/D43487

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_60@329799 91177308-0d34-0410-b5e6-96231b3b80d8

7 files changed, 81 insertions, 1 deletions

diff --git a/include/clang/Basic/DiagnosticDriverKinds.td b/include/clang/Basic/DiagnosticDriverKinds.td
index 28aead0cdb..69c20ea780 100644
--- a/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/include/clang/Basic/DiagnosticDriverKinds.td
@@ -326,6 +326,10 @@ def warn_drv_unsupported_abicalls : Warning<
   "ignoring '-mabicalls' option as it cannot be used with "
   "non position-independent code and the N64 ABI">,
   InGroup<OptionIgnored>;
+def err_drv_unsupported_indirect_jump_opt : Error<
+  "'-mindirect-jump=%0' is unsupported with the '%1' architecture">;
+def err_drv_unknown_indirect_jump_opt : Error<
+  "unknown '-mindirect-jump=' option '%0'">;
 
 def warn_drv_unable_to_find_directory_expected : Warning<
   "unable to find %0 directory, expected to be in '%1'">,
diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index ad72aef3fc..288bd482bb 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1992,6 +1992,9 @@ def mbranch_likely : Flag<["-"], "mbranch-likely">, Group<m_Group>,
   IgnoredGCCCompat;
 def mno_branch_likely : Flag<["-"], "mno-branch-likely">, Group<m_Group>,
   IgnoredGCCCompat;
+def mindirect_jump_EQ : Joined<["-"], "mindirect-jump=">,
+  Group<m_Group>,
+  HelpText<"Change indirect jump instructions to inhibit speculation">;
 def mdsp : Flag<["-"], "mdsp">, Group<m_Group>;
 def mno_dsp : Flag<["-"], "mno-dsp">, Group<m_Group>;
 def mdspr2 : Flag<["-"], "mdspr2">, Group<m_Group>;
diff --git a/lib/Basic/Targets/Mips.h b/lib/Basic/Targets/Mips.h
index 28900f21f8..4b61116a32 100644
--- a/lib/Basic/Targets/Mips.h
+++ b/lib/Basic/Targets/Mips.h
@@ -54,6 +54,7 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
   enum DspRevEnum { NoDSP, DSP1, DSP2 } DspRev;
   bool HasMSA;
   bool DisableMadd4;
+  bool UseIndirectJumpHazard;
 
 protected:
   bool HasFP64;
@@ -64,7 +65,8 @@ public:
       : TargetInfo(Triple), IsMips16(false), IsMicromips(false),
         IsNan2008(false), IsAbs2008(false), IsSingleFloat(false),
         IsNoABICalls(false), CanUseBSDABICalls(false), FloatABI(HardFloat),
-        DspRev(NoDSP), HasMSA(false), DisableMadd4(false), HasFP64(false) {
+        DspRev(NoDSP), HasMSA(false), DisableMadd4(false),
+        UseIndirectJumpHazard(false), HasFP64(false) {
     TheCXXABI.set(TargetCXXABI::GenericMIPS);
 
     setABI((getTriple().getArch() == llvm::Triple::mips ||
@@ -338,6 +340,8 @@ public:
         IsAbs2008 = false;
       else if (Feature == "+noabicalls")
         IsNoABICalls = true;
+      else if (Feature == "+use-indirect-jump-hazard")
+        UseIndirectJumpHazard = true;
     }
 
     setDataLayout();
diff --git a/lib/Driver/ToolChains/Arch/Mips.cpp b/lib/Driver/ToolChains/Arch/Mips.cpp
index 61481a92d0..e72754d5ad 100644
--- a/lib/Driver/ToolChains/Arch/Mips.cpp
+++ b/lib/Driver/ToolChains/Arch/Mips.cpp
@@ -343,6 +343,28 @@ void mips::getMIPSTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   AddTargetFeature(Args, Features, options::OPT_mno_madd4, options::OPT_mmadd4,
                    "nomadd4");
   AddTargetFeature(Args, Features, options::OPT_mmt, options::OPT_mno_mt, "mt");
+
+  if (Arg *A = Args.getLastArg(options::OPT_mindirect_jump_EQ)) {
+    StringRef Val = StringRef(A->getValue());
+    if (Val == "hazard") {
+      Arg *B =
+          Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
+      Arg *C = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
+
+      if (B && B->getOption().matches(options::OPT_mmicromips))
+        D.Diag(diag::err_drv_unsupported_indirect_jump_opt)
+            << "hazard" << "micromips";
+      else if (C && C->getOption().matches(options::OPT_mips16))
+        D.Diag(diag::err_drv_unsupported_indirect_jump_opt)
+            << "hazard" << "mips16";
+      else if (mips::supportsIndirectJumpHazardBarrier(CPUName))
+        Features.push_back("+use-indirect-jump-hazard");
+      else
+        D.Diag(diag::err_drv_unsupported_indirect_jump_opt)
+            << "hazard" << CPUName;
+    } else
+      D.Diag(diag::err_drv_unknown_indirect_jump_opt) << Val;
+  }
 }
 
 mips::IEEE754Standard mips::getIEEE754Standard(StringRef &CPU) {
@@ -447,3 +469,20 @@ bool mips::shouldUseFPXX(const ArgList &Args, const llvm::Triple &Triple,
 
   return UseFPXX;
 }
+
+bool mips::supportsIndirectJumpHazardBarrier(StringRef &CPU) {
+  // Supporting the hazard barrier method of dealing with indirect
+  // jumps requires MIPSR2 support.
+  return llvm::StringSwitch<bool>(CPU)
+      .Case("mips32r2", true)
+      .Case("mips32r3", true)
+      .Case("mips32r5", true)
+      .Case("mips32r6", true)
+      .Case("mips64r2", true)
+      .Case("mips64r3", true)
+      .Case("mips64r5", true)
+      .Case("mips64r6", true)
+      .Case("octeon", true)
+      .Case("p5600", true)
+      .Default(false);
+}
diff --git a/lib/Driver/ToolChains/Arch/Mips.h b/lib/Driver/ToolChains/Arch/Mips.h
index 89eea9a151..7e90488363 100644
--- a/lib/Driver/ToolChains/Arch/Mips.h
+++ b/lib/Driver/ToolChains/Arch/Mips.h
@@ -53,6 +53,7 @@ bool isFPXXDefault(const llvm::Triple &Triple, StringRef CPUName,
 bool shouldUseFPXX(const llvm::opt::ArgList &Args, const llvm::Triple &Triple,
                    StringRef CPUName, StringRef ABIName,
                    mips::FloatABI FloatABI);
+bool supportsIndirectJumpHazardBarrier(StringRef &CPU);
 
 } // end namespace mips
 } // end namespace target
diff --git a/test/Driver/mips-features.c b/test/Driver/mips-features.c
index a9db0f1017..d9bde7ded6 100644
--- a/test/Driver/mips-features.c
+++ b/test/Driver/mips-features.c
@@ -402,3 +402,9 @@
 // RUN: %clang -target -mips-mti-linux-gnu -### -c %s -mno-branch-likely 2>&1 \
 // RUN:   | FileCheck --check-prefix=NO-BRANCH-LIKELY %s
 // NO-BRANCH-LIKELY: argument unused during compilation: '-mno-branch-likely'
+
+// -mindirect-jump=hazard
+// RUN: %clang -target mips-unknown-linux-gnu -### -c %s \
+// RUN:        -mindirect-jump=hazard 2>&1 \
+// RUN:   | FileCheck --check-prefix=INDIRECT-BH %s
+// INDIRECT-BH: "-target-feature" "+use-indirect-jump-hazard"
diff --git a/test/Driver/mips-indirect-branch.c b/test/Driver/mips-indirect-branch.c
new file mode 100644
index 0000000000..64e85d5dc5
--- /dev/null
+++ b/test/Driver/mips-indirect-branch.c
@@ -0,0 +1,23 @@
+// REQUIRES: mips-registered-target
+// -mindirect-jump=hazard -mips32
+// RUN: %clang -target mips-unknown-linux-gnu -mips32 -### -c %s \
+// RUN:        -mindirect-jump=hazard 2>&1 | FileCheck %s --check-prefix=MIPS32
+// MIPS32: error: '-mindirect-jump=hazard' is unsupported with the 'mips32' architecture
+
+// -mindirect-jump=hazard -mmicromips
+// RUN: %clang -target mips-unknown-linux-gnu -mmicromips -### -c %s \
+// RUN:        -mindirect-jump=hazard 2>&1 | FileCheck %s --check-prefix=MICROMIPS
+// MICROMIPS: error: '-mindirect-jump=hazard' is unsupported with the 'micromips' architecture
+
+// -mindirect-jump=hazard -mips16
+// RUN: %clang -target mips-unknown-linux-gnu -mips16 -### -c %s \
+// RUN:        -mindirect-jump=hazard 2>&1 | FileCheck %s --check-prefix=MIPS16
+// MIPS16: error: '-mindirect-jump=hazard' is unsupported with the 'mips16' architecture
+
+// RUN: %clang -target mips-unknown-linux-gnu  -### -c %s \
+// RUN:        -mindirect-jump=retopline 2>&1 | FileCheck %s --check-prefix=RETOPLINE
+// RETOPLINE: error: unknown '-mindirect-jump=' option 'retopline'
+
+// RUN: %clang -target mips-unknown-linux-gnu  -### -mips32 -c %s \
+// RUN:        -mindirect-jump=retopline 2>&1 | FileCheck %s --check-prefix=MIXED
+// MIXED: error: unknown '-mindirect-jump=' option 'retopline'