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add a special relocation type for movq loads for object

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files that produce special relocation types where the 
linker changes movq's into lea's.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98839 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-03-18 18:10:56 +00:00
parent 1584390e55
commit 0f53cf2236
3 changed files with 23 additions and 5 deletions
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15
lib/Target/X86/X86MCCodeEmitter.cpp
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@@ -38,14 +38,15 @@ public:
~X86MCCodeEmitter() {}
unsigned getNumFixupKinds() const {
return 3;
return 4;
}
const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
const static MCFixupKindInfo Infos[] = {
{ "reloc_pcrel_4byte", 0, 4 * 8 },
{ "reloc_pcrel_1byte", 0, 1 * 8 },
{ "reloc_riprel_4byte", 0, 4 * 8 }
{ "reloc_riprel_4byte", 0, 4 * 8 },
{ "reloc_riprel_4byte_movq_load", 0, 4 * 8 }
};
if (Kind < FirstTargetFixupKind)
@@ -197,6 +198,14 @@ void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
"Invalid rip-relative address");
EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
unsigned FixupKind = X86::reloc_riprel_4byte;
// movq loads are handled with a special relocation form which allows the
// linker to eliminate some loads for GOT references which end up in the
// same linkage unit.
if (MI.getOpcode() == X86::MOV64rm_TC)
FixupKind = X86::reloc_riprel_4byte_movq_load;
// rip-relative addressing is actually relative to the *next* instruction.
// Since an immediate can follow the mod/rm byte for an instruction, this
// means that we need to bias the immediate field of the instruction with
@@ -204,7 +213,7 @@ void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
// expression to emit.
int ImmSize = X86II::hasImm(TSFlags) ? X86II::getSizeOfImm(TSFlags) : 0;
EmitImmediate(Disp, 4, MCFixupKind(X86::reloc_riprel_4byte),
EmitImmediate(Disp, 4, MCFixupKind(FixupKind),
CurByte, OS, Fixups, -ImmSize);
return;
}