Index: ELF/ScriptLexer.cpp
===================================================================
--- ELF/ScriptLexer.cpp
+++ ELF/ScriptLexer.cpp
@@ -168,7 +168,7 @@
 // Split a given string as an expression.
 // This function returns "3", "*" and "5" for "3*5" for example.
 static std::vector<StringRef> tokenizeExpr(StringRef S) {
-  StringRef Ops = "+-*/:"; // List of operators
+  StringRef Ops = "+-*/:!"; // List of operators
 
   // Quoted strings are literal strings, so we don't want to split it.
   if (S.startswith("\""))
@@ -212,6 +212,9 @@
   std::vector<StringRef> V = tokenizeExpr(Tokens[Pos]);
   if (V.size() == 1)
     return;
+  // Don't breakup != operator into 2 tokens
+  if (V.size() == 2 && V[0] == "!" && V[1] == "=")
+    return;
   Tokens.erase(Tokens.begin() + Pos);
   Tokens.insert(Tokens.begin() + Pos, V.begin(), V.end());
 }
Index: ELF/ScriptParser.cpp
===================================================================
--- ELF/ScriptParser.cpp
+++ ELF/ScriptParser.cpp
@@ -884,6 +884,10 @@
     Expr E = readPrimary();
     return [=] { return ~E().getValue(); };
   }
+  if (consume("!")) {
+    Expr E = readPrimary();
+    return [=] { return !E().getValue(); };
+  }
   if (consume("-")) {
     Expr E = readPrimary();
     return [=] { return -E().getValue(); };
Index: test/ELF/linkerscript/symbol-assignexpr.s
===================================================================
--- test/ELF/linkerscript/symbol-assignexpr.s
+++ test/ELF/linkerscript/symbol-assignexpr.s
@@ -15,6 +15,8 @@
 # RUN:         symbol11 = ((0x28000 + 0x1fff) & ~(0x1000 + -1)); \
 # RUN:         symbol12 = 0x1234; \
 # RUN:         symbol12 += 1; \
+# RUN:         symbol13 = !1; \
+# RUN:         symbol14 = !0; \
 # RUN:         bar = 0x5678; \
 # RUN:         baz = 0x9abc; \
 # RUN:       }" > %t.script
@@ -39,6 +41,8 @@
 # CHECK-NEXT: fedcba9876543210 *ABS* 00000000 symbol10
 # CHECK-NEXT: 0000000000029000 *ABS* 00000000 symbol11
 # CHECK-NEXT: 0000000000001235 *ABS* 00000000 symbol12
+# CHECK-NEXT: 0000000000000000 *ABS* 00000000 symbol13
+# CHECK-NEXT: 0000000000000001 *ABS* 00000000 symbol14
 
 # RUN: echo "SECTIONS { symbol2 = symbol; }" > %t2.script
 # RUN: not ld.lld -o %t2 --script %t2.script %t 2>&1 \