clang: add ARM CMSIS Macros and arm-none-eabi sanitizer

@@ -619,7 +619,15 @@ void ARMTargetInfo::getTargetDefines(const LangOptions &Opts,
       (getTriple().getEnvironment() == llvm::Triple::EABI ||
        getTriple().getEnvironment() == llvm::Triple::EABIHF))
     Builder.defineMacro("__ELF__");
-    
+
+  // pretend like we are ARM's Compiler which is based on LLVM
+  // this enable CMSIS to build without miodifications
+  Builder.defineMacro("__ARMCC_VERSION","6010050");
+
+  // Define annoation macros
+  Builder.defineMacro("__EDIVERT_ELEVATE","__asm volatile(\"push {r0}\\n\\t\" \"mrs r0, apsr \\n\\t\" \" push {r0}\\n\\t\" \" mrs r0, control \\n\\t\" \" tst r0, 1\\n\\t\" \" it  ne \\n\\t\" \" svcne 254 \\n\\t\" \" pop {r0} \\n\\t\" \" msr apsr, r0 \\n\\t\" \" pop {r0} \\n\\t\":::\"r0\",\"r1\",\"r2\",\"r3\",\"r4\",\"r5\",\"r6\",\"r7\",\"r8\",\"r9\",\"r10\",\"r11\",\"r12\",\"r13\",\"r14\",\"lr\",\"memory\");");
+  Builder.defineMacro("__EDIVERT_DROP","__asm volatile(\"push{r0}\\n\\t\" \" mrs r0, control\\n\\t\" \" orr r0, 1\\n\\t\" \" msr control, r0 \\n\\t\" \" pop {r0} \\n\\t\":::\"r0\",\"r1\",\"r2\",\"r3\",\"r4\",\"r5\",\"r6\",\"r7\",\"r8\",\"r9\",\"r10\",\"r11\",\"r12\",\"r13\",\"r14\",\"lr\",\"memory\");");
+
   // Target properties.
   Builder.defineMacro("__REGISTER_PREFIX__", "");
 

@@ -1032,6 +1032,16 @@ SanitizerMask ToolChain::getSupportedSanitizers() const {
       getTriple().isAArch64())
     Res |= SanitizerKind::CFIICall;
 
+  switch(getTriple().getArch()) {
+    case llvm::Triple::arm:
+    case llvm::Triple::thumb:
+      if (getTriple().getOS() == llvm::Triple::UnknownOS &&
+          getTriple().getEnvironment() == llvm::Triple::EABI) {
+            Res |= SanitizerKind::SafeStack;
+          }
+    default:
+    ;
+  }
   if (getTriple().getArch() == llvm::Triple::x86_64 ||
       getTriple().isAArch64() || getTriple().isRISCV())
     Res |= SanitizerKind::ShadowCallStack;