[Mips] Support R_MICROMIPS_LITERAL relocation handling

llvm-svn: 240267

lld/lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp

@@ -129,6 +129,7 @@ static MipsRelocationParams getRelocationParams(uint32_t rType) {
   case R_MIPS_TLS_TPREL_LO16:
     return {4, 0xffff, 0, false, dummyCheck};
   case R_MICROMIPS_GPREL16:
+  case R_MICROMIPS_LITERAL:
     return {4, 0xffff, 0, true, signedCheck<16>};
   case R_MICROMIPS_GPREL7_S2:
     return {4, 0x7f, 2, false, signedCheck<9>};
@@ -459,6 +460,7 @@ static ErrorOr<int64_t> calculateRelocation(Reference::KindValue kind,
   case R_MIPS_LITERAL:
   case R_MICROMIPS_GPREL16:
   case R_MICROMIPS_GPREL7_S2:
+  case R_MICROMIPS_LITERAL:
     return tgtAddr + addend - gpAddr;
   case R_MIPS_JALR:
   case R_MICROMIPS_JALR:
@@ -636,6 +638,7 @@ Reference::Addend readMipsRelocAddend(Reference::KindValue kind,
   case R_MICROMIPS_GPREL16:
   case R_MIPS_PCLO16:
   case R_MIPS_LITERAL:
+  case R_MICROMIPS_LITERAL:
     return llvm::SignExtend32<16>(res);
   case R_MICROMIPS_GPREL7_S2:
     return llvm::SignExtend32<9>(res);

lld/lib/ReaderWriter/ELF/Mips/MipsRelocationPass.cpp

@@ -579,6 +579,7 @@ void RelocationPass<ELFT>::handleReference(const MipsELFDefinedAtom<ELFT> &atom,
   case R_MICROMIPS_GPREL16:
   case R_MICROMIPS_GPREL7_S2:
   case R_MIPS_LITERAL:
+  case R_MICROMIPS_LITERAL:
     if (isLocal(ref.target()))
       ref.setAddend(ref.addend() + atom.file().getGP0());
     break;
@@ -626,6 +627,7 @@ static bool isConstrainSym(const MipsELFDefinedAtom<ELFT> &atom,
   case R_MICROMIPS_GPREL16:
   case R_MICROMIPS_GPREL7_S2:
   case R_MIPS_LITERAL:
+  case R_MICROMIPS_LITERAL:
     return false;
   default:
     return true;

lld/test/elf/Mips/rel-lit-micro.test

@@ -0,0 +1,59 @@
+# Check handling of R_MICROMIPS_LITERAL relocation.
+
+# RUN: yaml2obj -format=elf %s > %t.o
+# RUN: lld -flavor gnu -target mipsel -e T0 -o %t.exe %t.o
+# RUN: llvm-objdump -s -t %t.exe | FileCheck %s
+
+# CHECK:      Contents of section .text:
+# CHECK-NEXT:  400130 00000f10
+#                     ^ 0x402000 + 0x7fff - 0x408ff0 = 0x100f
+
+# CHECK: 00402000 g   .data  00000004 D0
+# CHECK: 00408ff0 g   *ABS*  00000000 _gp_disp
+
+---
+FileHeader:      
+  Class:    ELFCLASS32
+  Data:     ELFDATA2LSB
+  Type:     ET_REL
+  Machine:  EM_MIPS
+  Flags:    [EF_MIPS_PIC, EF_MIPS_CPIC, EF_MIPS_ABI_O32,
+             EF_MIPS_ARCH_32, EF_MIPS_MICROMIPS]
+
+Sections:        
+  - Name:          .text
+    Type:          SHT_PROGBITS
+    Flags:         [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:  16
+    Content:       "0000ff7f"
+
+  - Name:          .rel.text
+    Type:          SHT_REL
+    Link:          .symtab
+    AddressAlign:  4
+    Info:          .text
+    Relocations:   
+      - Offset:  0
+        Symbol:  D0
+        Type:    R_MICROMIPS_LITERAL
+
+  - Name:          .data
+    Type:          SHT_PROGBITS
+    Flags:         [ SHF_ALLOC, SHF_WRITE ]
+    AddressAlign:  16
+    Size:          4
+
+Symbols:         
+  Global:          
+    - Name:     T0
+      Type:     STT_FUNC
+      Section:  .text
+      Value:    0
+      Size:     4
+      Other:    [STO_MIPS_MICROMIPS]
+    - Name:     D0
+      Type:     STT_OBJECT
+      Section:  .data
+      Value:    0
+      Size:     4
+...