[lld] r240266 - [Mips] Support R_MIPS_LITERAL relocation handling

[Simon Atanasyan]

Author: atanasyan
Date: Mon Jun 22 04:26:48 2015
New Revision: 240266

URL: http://llvm.org/viewvc/llvm-project?rev=240266&view=rev
Log:
[Mips] Support R_MIPS_LITERAL relocation handling

Added:
    lld/trunk/test/elf/Mips/rel-lit.test
Modified:
    lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp
    lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationPass.cpp

Modified: lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp?rev=240266&r1=240265&r2=240266&view=diff
==============================================================================
--- lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp (original)
+++ lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp Mon Jun 22 04:26:48 2015
@@ -117,6 +117,7 @@ static MipsRelocationParams getRelocatio
   case R_MIPS_TLS_GD:
   case R_MIPS_TLS_LDM:
   case R_MIPS_TLS_GOTTPREL:
+  case R_MIPS_LITERAL:
     return {4, 0xffff, 0, false, signedCheck<16>};
   case R_MIPS_GOT_HI16:
   case R_MIPS_GOT_LO16:
@@ -455,7 +456,7 @@ static ErrorOr<int64_t> calculateRelocat
     return relocLo16(0, tgtAddr, addend, false, true);
   case R_MIPS_GPREL16:
   case R_MIPS_GPREL32:
-    return tgtAddr + addend - gpAddr;
+  case R_MIPS_LITERAL:
   case R_MICROMIPS_GPREL16:
   case R_MICROMIPS_GPREL7_S2:
     return tgtAddr + addend - gpAddr;
@@ -634,6 +635,7 @@ Reference::Addend readMipsRelocAddend(Re
   case R_MIPS_GPREL16:
   case R_MICROMIPS_GPREL16:
   case R_MIPS_PCLO16:
+  case R_MIPS_LITERAL:
     return llvm::SignExtend32<16>(res);
   case R_MICROMIPS_GPREL7_S2:
     return llvm::SignExtend32<9>(res);

Modified: lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationPass.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationPass.cpp?rev=240266&r1=240265&r2=240266&view=diff
==============================================================================
--- lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationPass.cpp (original)
+++ lld/trunk/lib/ReaderWriter/ELF/Mips/MipsRelocationPass.cpp Mon Jun 22 04:26:48 2015
@@ -578,6 +578,7 @@ void RelocationPass<ELFT>::handleReferen
   case R_MIPS_GPREL16:
   case R_MICROMIPS_GPREL16:
   case R_MICROMIPS_GPREL7_S2:
+  case R_MIPS_LITERAL:
     if (isLocal(ref.target()))
       ref.setAddend(ref.addend() + atom.file().getGP0());
     break;
@@ -624,6 +625,7 @@ static bool isConstrainSym(const MipsELF
   case R_MIPS_GPREL32:
   case R_MICROMIPS_GPREL16:
   case R_MICROMIPS_GPREL7_S2:
+  case R_MIPS_LITERAL:
     return false;
   default:
     return true;

Added: lld/trunk/test/elf/Mips/rel-lit.test
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/elf/Mips/rel-lit.test?rev=240266&view=auto
==============================================================================
--- lld/trunk/test/elf/Mips/rel-lit.test (added)
+++ lld/trunk/test/elf/Mips/rel-lit.test Mon Jun 22 04:26:48 2015
@@ -0,0 +1,57 @@
+# Check handling of R_MIPS_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 0f100000
+#                     ^ 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]
+
+Sections:        
+  - Name:          .text
+    Type:          SHT_PROGBITS
+    Flags:         [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:  16
+    Content:       "ff7f0000"
+
+  - Name:          .rel.text
+    Type:          SHT_REL
+    Link:          .symtab
+    AddressAlign:  4
+    Info:          .text
+    Relocations:   
+      - Offset:  0
+        Symbol:  D0
+        Type:    R_MIPS_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
+    - Name:     D0
+      Type:     STT_OBJECT
+      Section:  .data
+      Value:    0
+      Size:     4
+...