[ELF][MIPS] Use InputSectionBase::getOutputSection() to access outp…

…ut sections from the `MipsGotSection`

Follow-up to r294005. This patch restores handling of MISP GOT
relocations against merge sections.

llvm-svn: 295040

lld/ELF/SyntheticSections.cpp

@@ -493,7 +493,8 @@ void MipsGotSection<ELFT>::addEntry(SymbolBody &Sym, uintX_t Addend,
     // sections referenced by GOT relocations. Then later in the `finalize`
     // method calculate number of "pages" required to cover all saved output
     // section and allocate appropriate number of GOT entries.
-    PageIndexMap.insert({cast<DefinedRegular<ELFT>>(&Sym)->Section->OutSec, 0});
+    auto *DefSym = cast<DefinedRegular<ELFT>>(&Sym);
+    PageIndexMap.insert({DefSym->Section->getOutputSection(), 0});
     return;
   }
   if (Sym.isTls()) {
@@ -564,7 +565,7 @@ typename MipsGotSection<ELFT>::uintX_t
 MipsGotSection<ELFT>::getPageEntryOffset(const SymbolBody &B,
                                          uintX_t Addend) const {
   const OutputSectionBase *OutSec =
-      cast<DefinedRegular<ELFT>>(&B)->Section->OutSec;
+      cast<DefinedRegular<ELFT>>(&B)->Section->getOutputSection();
   uintX_t SecAddr = getMipsPageAddr(OutSec->Addr);
   uintX_t SymAddr = getMipsPageAddr(B.getVA<ELFT>(Addend));
   uintX_t Index = PageIndexMap.lookup(OutSec) + (SymAddr - SecAddr) / 0xffff;

lld/test/ELF/mips-got-string.s

@@ -0,0 +1,28 @@
+# Check R_MIPS_GOT16 relocation against merge section.
+
+# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux -o %t.o %s
+# RUN: ld.lld -shared -o %t.so %t.o
+# RUN: llvm-readobj -t -mips-plt-got %t.so | FileCheck %s
+
+# REQUIRES: mips
+
+# CHECK:      Symbol {
+# CHECK:        Name: $.str
+# CHECK-NEXT:   Value: 0xF4
+# CHECK:      }
+
+# CHECK:      Local entries [
+# CHECK-NEXT:   Entry {
+# CHECK-NEXT:     Address:
+# CHECK-NEXT:     Access: -32744
+# CHECK-NEXT:     Initial: 0x0
+# CHECK:        }
+# CHECK:      ]
+
+  .text
+  lw     $t9, %got($.str)($gp)
+  addiu  $a0, $t9, %lo($.str)
+
+  .section  .rodata.str,"aMS",@progbits,1
+$.str:
+  .asciz "foo"