[mips] Fix PR35140

[sdardis]

Summary

Mark all symbols involved with TLS relocations as being TLS symbols.

This resolves PR35140.

Thanks to Alex Crichton for reporting the issue!

[atanasyan]

LGTM

lib/Target/Mips/MCTargetDesc/MipsMCExpr.cpp

 void MipsMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
   switch (getKind()) {
   case MEK_None:
   case MEK_Special:
     llvm_unreachable("MEK_None and MEK_Special are invalid");
     break;
   case MEK_CALL_HI16:
   case MEK_CALL_LO16:
-  case MEK_DTPREL_HI:
-  case MEK_DTPREL_LO:
   case MEK_GOT:
   case MEK_GOT_CALL:
   case MEK_GOT_DISP:
   case MEK_GOT_HI16:
   case MEK_GOT_LO16:
   case MEK_GOT_OFST:
   case MEK_GOT_PAGE:
   case MEK_GPREL:
   case MEK_HI:
   case MEK_HIGHER:
   case MEK_HIGHEST:
   case MEK_LO:
   case MEK_NEG:
   case MEK_PCREL_HI16:
   case MEK_PCREL_LO16:
-  case MEK_TLSLDM:
     // If we do have nested target-specific expressions, they will be in
     // a consecutive chain.
     if (const MipsMCExpr *E = dyn_cast<const MipsMCExpr>(getSubExpr()))
       E->fixELFSymbolsInTLSFixups(Asm);
     break;
-  case MEK_GOTTPREL:
+  case MEK_DTPREL_HI:
+  case MEK_DTPREL_LO:
+  case MEK_TLSLDM:
   case MEK_TLSGD:
+  case MEK_GOTTPREL:
   case MEK_TPREL_HI:
   case MEK_TPREL_LO:
     fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
     break;
   }
 }
 
 bool MipsMCExpr::isGpOff(MipsExprKind &Kind) const {

test/MC/Mips/tls-symbols.s

+# RUN: llvm-mc -arch=mips < %s -position-independent -filetype=obj \
+# RUN:   | llvm-readelf -symbols | FileCheck %s
+# RUN: llvm-mc -arch=mips < %s -filetype=obj | llvm-readelf -symbols \
+# RUN:   | FileCheck %s
+
+# Test that TLS relocations cause symbols to be marked as TLS symbols.
+
+  .set  noat
+  lui $3, %tlsgd(foo1)
+  lui $1, %dtprel_hi(foo2)
+  lui $1, %dtprel_lo(foo3)
+  lui $1, %tprel_hi(foo4)
+  lui $1, %tprel_lo(foo5)
+  lw $2, %gottprel(foo6)($28)
+
+  .hidden foo1
+  .hidden foo2
+  .hidden foo3
+  .hidden foo4
+  .hidden foo5
+  .hidden foo6
+
+# CHECK:     1: {{.+}}       {{.+}} TLS     GLOBAL HIDDEN   UND foo1
+# CHECK:     2: {{.+}}       {{.+}} TLS     GLOBAL HIDDEN   UND foo2
+# CHECK:     3: {{.+}}       {{.+}} TLS     GLOBAL HIDDEN   UND foo3
+# CHECK:     4: {{.+}}       {{.+}} TLS     GLOBAL HIDDEN   UND foo4
+# CHECK:     5: {{.+}}       {{.+}} TLS     GLOBAL HIDDEN   UND foo5
+# CHECK:     6: {{.+}}       {{.+}} TLS     GLOBAL HIDDEN   UND foo6