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Trampoline support for x86-64. This looks like

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it should work, but I have no machine to test
it on.  Committed because it will at least
cause no harm, and maybe someone can test it
for me!

llvm-svn: 46098
This commit is contained in:
Duncan Sands 2008-01-16 22:55:25 +00:00
parent 81a39bb7ba
commit 78e448d8b4
2 changed files with 70 additions and 7 deletions
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63
lib/Target/X86/X86ISelLowering.cpp
View File

@ -4802,8 +4802,59 @@ SDOperand X86TargetLowering::LowerTRAMPOLINE(SDOperand Op,
SrcValueSDNode *TrmpSV = cast<SrcValueSDNode>(Op.getOperand(4));
const X86InstrInfo *TII =
((X86TargetMachine&)getTargetMachine()).getInstrInfo();
if (Subtarget->is64Bit()) {
return SDOperand(); // not yet supported
SDOperand OutChains[6];
// Large code-model.
const unsigned char JMP64r = TII->getBaseOpcodeFor(X86::JMP64r);
const unsigned char MOV64ri = TII->getBaseOpcodeFor(X86::MOV64ri);
const unsigned char N86R10 =
((X86RegisterInfo*)RegInfo)->getX86RegNum(X86::R10);
const unsigned char N86R11 =
((X86RegisterInfo*)RegInfo)->getX86RegNum(X86::R11);
const unsigned char REX_WB = 0x40 | 0x08 | 0x01; // REX prefix
// Load the pointer to the nested function into R11.
unsigned OpCode = ((MOV64ri | N86R11) << 8) | REX_WB; // movabsq r11
SDOperand Addr = Trmp;
OutChains[0] = DAG.getStore(Root, DAG.getConstant(OpCode, MVT::i16), Addr,
TrmpSV->getValue(), TrmpSV->getOffset());
Addr = DAG.getNode(ISD::ADD, MVT::i64, Trmp, DAG.getConstant(2, MVT::i64));
OutChains[1] = DAG.getStore(Root, FPtr, Addr, TrmpSV->getValue(),
TrmpSV->getOffset() + 2, false, 2);
// Load the 'nest' parameter value into R10.
// R10 is specified in X86CallingConv.td
OpCode = ((MOV64ri | N86R10) << 8) | REX_WB; // movabsq r10
Addr = DAG.getNode(ISD::ADD, MVT::i64, Trmp, DAG.getConstant(10, MVT::i64));
OutChains[2] = DAG.getStore(Root, DAG.getConstant(OpCode, MVT::i16), Addr,
TrmpSV->getValue(), TrmpSV->getOffset() + 10);
Addr = DAG.getNode(ISD::ADD, MVT::i64, Trmp, DAG.getConstant(12, MVT::i64));
OutChains[3] = DAG.getStore(Root, Nest, Addr, TrmpSV->getValue(),
TrmpSV->getOffset() + 12, false, 2);
// Jump to the nested function.
OpCode = (JMP64r << 8) | REX_WB; // jmpq *...
Addr = DAG.getNode(ISD::ADD, MVT::i64, Trmp, DAG.getConstant(20, MVT::i64));
OutChains[4] = DAG.getStore(Root, DAG.getConstant(OpCode, MVT::i16), Addr,
TrmpSV->getValue(), TrmpSV->getOffset() + 20);
unsigned char ModRM = N86R11 | (4 << 3) | (3 << 6); // ...r11
Addr = DAG.getNode(ISD::ADD, MVT::i64, Trmp, DAG.getConstant(22, MVT::i64));
OutChains[5] = DAG.getStore(Root, DAG.getConstant(ModRM, MVT::i8), Addr,
TrmpSV->getValue(), TrmpSV->getOffset() + 22);
SDOperand Ops[] =
{ Trmp, DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains, 6) };
return DAG.getNode(ISD::MERGE_VALUES, Op.Val->getVTList(), Ops, 2);
} else {
Function *Func = (Function *)
cast<Function>(cast<SrcValueSDNode>(Op.getOperand(5))->getValue());
@ -4847,17 +4898,15 @@ SDOperand X86TargetLowering::LowerTRAMPOLINE(SDOperand Op,
break;
}
const X86InstrInfo *TII =
((X86TargetMachine&)getTargetMachine()).getInstrInfo();
SDOperand OutChains[4];
SDOperand Addr, Disp;
Addr = DAG.getNode(ISD::ADD, MVT::i32, Trmp, DAG.getConstant(10, MVT::i32));
Disp = DAG.getNode(ISD::SUB, MVT::i32, FPtr, Addr);
unsigned char MOV32ri = TII->getBaseOpcodeFor(X86::MOV32ri);
unsigned char N86Reg = ((X86RegisterInfo*)RegInfo)->getX86RegNum(NestReg);
const unsigned char MOV32ri = TII->getBaseOpcodeFor(X86::MOV32ri);
const unsigned char N86Reg =
((X86RegisterInfo*)RegInfo)->getX86RegNum(NestReg);
OutChains[0] = DAG.getStore(Root, DAG.getConstant(MOV32ri|N86Reg, MVT::i8),
Trmp, TrmpSV->getValue(), TrmpSV->getOffset());
@ -4865,7 +4914,7 @@ SDOperand X86TargetLowering::LowerTRAMPOLINE(SDOperand Op,
OutChains[1] = DAG.getStore(Root, Nest, Addr, TrmpSV->getValue(),
TrmpSV->getOffset() + 1, false, 1);
unsigned char JMP = TII->getBaseOpcodeFor(X86::JMP);
const unsigned char JMP = TII->getBaseOpcodeFor(X86::JMP);
Addr = DAG.getNode(ISD::ADD, MVT::i32, Trmp, DAG.getConstant(5, MVT::i32));
OutChains[2] = DAG.getStore(Root, DAG.getConstant(JMP, MVT::i8), Addr,
TrmpSV->getValue() + 5, TrmpSV->getOffset());

14
test/CodeGen/X86/2008-01-16-Trampoline.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llvm-as < %s | llc -march=x86
; RUN: llvm-as < %s | llc -march=x86-64
%struct.FRAME.gnat__perfect_hash_generators__select_char_position__build_identical_keys_sets = type { i32, i32, void (i32, i32)*, i8 (i32, i32)* }
define fastcc i32 @gnat__perfect_hash_generators__select_char_position__build_identical_keys_sets.5146(i64 %table.0.0, i64 %table.0.1, i32 %last, i32 %pos) {
entry:
%tramp22 = call i8* @llvm.init.trampoline( i8* null, i8* bitcast (void (%struct.FRAME.gnat__perfect_hash_generators__select_char_position__build_identical_keys_sets*, i32, i32)* @gnat__perfect_hash_generators__select_char_position__build_identical_keys_sets__move.5177 to i8*), i8* null ) ; <i8*> [#uses=0]
unreachable
}
declare void @gnat__perfect_hash_generators__select_char_position__build_identical_keys_sets__move.5177(%struct.FRAME.gnat__perfect_hash_generators__select_char_position__build_identical_keys_sets* nest , i32, i32) nounwind
declare i8* @llvm.init.trampoline(i8*, i8*, i8*) nounwind