[ELF2][mips] Support R_MIPS_32 relocation

llvm-svn: 250045

lld/ELF/Target.cpp

@@ -365,6 +365,18 @@ bool MipsTargetInfo::relocNeedsPlt(uint32_t Type, const SymbolBody &S) const {
 }
 
 void MipsTargetInfo::relocateOne(uint8_t *Buf, const void *RelP, uint32_t Type,
-                                 uint64_t BaseAddr, uint64_t SymVA) const {}
+                                 uint64_t BaseAddr, uint64_t SymVA) const {
+  typedef ELFFile<ELF32LE>::Elf_Rel Elf_Rel;
+  auto &Rel = *reinterpret_cast<const Elf_Rel *>(RelP);
+
+  switch (Type) {
+  case R_MIPS_32:
+    add32le(Buf + Rel.r_offset, SymVA);
+    break;
+  default:
+    error(Twine("unrecognized reloc ") + Twine(Type));
+    break;
+  }
+}
 }
 }

lld/test/elf2/mips-relocs.s

@@ -0,0 +1,31 @@
+# Check R_MIPS_32 relocation calculation.
+# RUN: llvm-mc -filetype=obj -triple=mipsel-unknown-linux %s -o %t.o
+# RUN: ld.lld2 %t.o -o %t.exe
+# RUN: llvm-objdump -s -t %t.exe | FileCheck %s
+
+# REQUIRES: mips
+
+  .globl  __start
+__start:
+  nop
+
+  .data
+  .type  v1,@object
+  .size  v1,4
+v1:
+  .word 0
+
+  .globl v2
+  .type  v2,@object
+  .size  v2,8
+v2:
+  .word v2+4 # R_MIPS_32 target v2 addend 4
+  .word v1   # R_MIPS_32 target v1 addend 0
+
+# CHECK: Contents of section .data:
+# CHECK-NEXT: 420000 00000000 08004200 00004200
+#                             ^-- v2+4 ^-- v1
+
+# CHECK: SYMBOL TABLE:
+# CHECK: 00420000 l       .data           00000004 v1
+# CHECK: 00420004 g       .data           00000008 v2