[llvm] r243087 - [bpf] initial support for debug_info

[Alexei Starovoitov]

Author: ast
Date: Thu Jul 23 22:17:08 2015
New Revision: 243087

URL: http://llvm.org/viewvc/llvm-project?rev=243087&view=rev
Log:
[bpf] initial support for debug_info

Modified:
    llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
    llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp
    llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFMCAsmInfo.h

Modified: llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp?rev=243087&r1=243086&r2=243087&view=diff
==============================================================================
--- llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp (original)
+++ llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp Thu Jul 23 22:17:08 2015
@@ -68,16 +68,23 @@ void BPFAsmBackend::applyFixup(const MCF
 
   if (Fixup.getKind() == FK_SecRel_4 || Fixup.getKind() == FK_SecRel_8) {
     assert(Value == 0);
-    return;
-  }
-  assert(Fixup.getKind() == FK_PCRel_2);
-  Value = (uint16_t)((Value - 8) / 8);
-  if (IsLittleEndian) {
-    Data[Fixup.getOffset() + 2] = Value & 0xFF;
-    Data[Fixup.getOffset() + 3] = Value >> 8;
+  } else if (Fixup.getKind() == FK_Data_4 || Fixup.getKind() == FK_Data_8) {
+    unsigned Size = Fixup.getKind() == FK_Data_4 ? 4 : 8;
+
+    for (unsigned i = 0; i != Size; ++i) {
+      unsigned Idx = IsLittleEndian ? i : Size - i;
+      Data[Fixup.getOffset() + Idx] = uint8_t(Value >> (i * 8));
+    }
   } else {
-    Data[Fixup.getOffset() + 2] = Value >> 8;
-    Data[Fixup.getOffset() + 3] = Value & 0xFF;
+    assert(Fixup.getKind() == FK_PCRel_2);
+    Value = (uint16_t)((Value - 8) / 8);
+    if (IsLittleEndian) {
+      Data[Fixup.getOffset() + 2] = Value & 0xFF;
+      Data[Fixup.getOffset() + 3] = Value >> 8;
+    } else {
+      Data[Fixup.getOffset() + 2] = Value >> 8;
+      Data[Fixup.getOffset() + 3] = Value & 0xFF;
+    }
   }
 }
 

Modified: llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp?rev=243087&r1=243086&r2=243087&view=diff
==============================================================================
--- llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp (original)
+++ llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp Thu Jul 23 22:17:08 2015
@@ -44,6 +44,10 @@ unsigned BPFELFObjectWriter::GetRelocTyp
     return ELF::R_X86_64_64;
   case FK_SecRel_4:
     return ELF::R_X86_64_PC32;
+  case FK_Data_8:
+    return IsPCRel ? ELF::R_X86_64_PC64 : ELF::R_X86_64_64;
+  case FK_Data_4:
+    return IsPCRel ? ELF::R_X86_64_PC32 : ELF::R_X86_64_32;
   }
 }
 

Modified: llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFMCAsmInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFMCAsmInfo.h?rev=243087&r1=243086&r2=243087&view=diff
==============================================================================
--- llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFMCAsmInfo.h (original)
+++ llvm/trunk/lib/Target/BPF/MCTargetDesc/BPFMCAsmInfo.h Thu Jul 23 22:17:08 2015
@@ -34,6 +34,8 @@ public:
     UsesELFSectionDirectiveForBSS = true;
     HasSingleParameterDotFile = false;
     HasDotTypeDotSizeDirective = false;
+
+    SupportsDebugInformation = true;
   }
 };
 }