Add more methods to gather target specific elf stuff
Support for .text relocations, implementing TargetELFWriter overloaded methods for x86/x86_64.
Use a map to track global values to their symbol table indexes
Code cleanup and small fixes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73894 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ELFWriterInfo.cpp b/lib/Target/X86/X86ELFWriterInfo.cpp
index d84034b..315118f 100644
--- a/lib/Target/X86/X86ELFWriterInfo.cpp
+++ b/lib/Target/X86/X86ELFWriterInfo.cpp
@@ -12,11 +12,17 @@
//===----------------------------------------------------------------------===//
#include "X86ELFWriterInfo.h"
+#include "X86Relocations.h"
#include "llvm/Function.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
+
using namespace llvm;
+//===----------------------------------------------------------------------===//
+// Implementation of the X86ELFWriterInfo class
+//===----------------------------------------------------------------------===//
+
X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)
: TargetELFWriterInfo(TM) {
bool is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
@@ -25,6 +31,34 @@
X86ELFWriterInfo::~X86ELFWriterInfo() {}
+unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
+ if (is64Bit) {
+ switch(MachineRelTy) {
+ case X86::reloc_pcrel_word:
+ return R_X86_64_PC32;
+ case X86::reloc_absolute_word:
+ return R_X86_64_32;
+ case X86::reloc_absolute_dword:
+ return R_X86_64_64;
+ case X86::reloc_picrel_word:
+ default:
+ assert(0 && "unknown relocation type");
+ }
+ } else {
+ switch(MachineRelTy) {
+ case X86::reloc_pcrel_word:
+ return R_386_PC32;
+ case X86::reloc_absolute_word:
+ return R_386_32;
+ case X86::reloc_absolute_dword:
+ case X86::reloc_picrel_word:
+ default:
+ assert(0 && "unknown relocation type");
+ }
+ }
+ return 0;
+}
+
unsigned X86ELFWriterInfo::getFunctionAlignment(const Function *F) const {
unsigned FnAlign = 4;
@@ -36,3 +70,15 @@
return (1 << FnAlign);
}
+
+long int X86ELFWriterInfo::getAddendForRelTy(unsigned RelTy) const {
+ if (is64Bit) {
+ switch(RelTy) {
+ case R_X86_64_PC32: return -4;
+ break;
+ default:
+ assert(0 && "unknown x86 relocation type");
+ }
+ }
+ return 0;
+}
diff --git a/lib/Target/X86/X86ELFWriterInfo.h b/lib/Target/X86/X86ELFWriterInfo.h
index e9c5bc4..96485b8 100644
--- a/lib/Target/X86/X86ELFWriterInfo.h
+++ b/lib/Target/X86/X86ELFWriterInfo.h
@@ -19,11 +19,43 @@
namespace llvm {
class X86ELFWriterInfo : public TargetELFWriterInfo {
+
+ // ELF Relocation types for X86
+ enum X86RelocationType {
+ R_386_NONE = 0,
+ R_386_32 = 1,
+ R_386_PC32 = 2
+ };
+
+ // ELF Relocation types for X86_64
+ enum X86_64RelocationType {
+ R_X86_64_NONE = 0,
+ R_X86_64_64 = 1,
+ R_X86_64_PC32 = 2,
+ R_X86_64_32 = 10,
+ R_X86_64_32S = 11,
+ R_X86_64_PC64 = 24
+ };
+
public:
X86ELFWriterInfo(TargetMachine &TM);
virtual ~X86ELFWriterInfo();
+ /// getFunctionAlignment - Returns the alignment for function 'F', targets
+ /// with different alignment constraints should overload this method
virtual unsigned getFunctionAlignment(const Function *F) const;
+
+ /// getRelocationType - Returns the target specific ELF Relocation type.
+ /// 'MachineRelTy' contains the object code independent relocation type
+ virtual unsigned getRelocationType(unsigned MachineRelTy) const;
+
+ /// hasRelocationAddend - True if the target uses an addend in the
+ /// ELF relocation entry.
+ virtual bool hasRelocationAddend() const { return is64Bit ? true : false; }
+
+ /// getAddendForRelTy - Gets the addend value for an ELF relocation entry
+ /// based on the target relocation type
+ virtual long int getAddendForRelTy(unsigned RelTy) const;
};
} // end llvm namespace