int TagType,
void *TagBuf);
+/**
+ * The initial support in LLVM MC for the most general form of a relocatable
+ * expression is "AddSymbol - SubtractSymbol + Offset". For some Darwin targets
+ * this full form is encoded in the relocation information so that AddSymbol and
+ * SubtractSymbol can be link edited independent of each other. Many other
+ * platforms only allow a relocatable expression of the form AddSymbol + Offset
+ * to be encoded.
+ *
+ * The LLVMOpInfoCallback() for the TagType value of 1 uses the struct
+ * LLVMOpInfo1. The value of the relocatable expression for the operand,
+ * including any PC adjustment, is passed in to the call back in the Value
+ * field. The symbolic information about the operand is returned using all
+ * the fields of the structure with the Offset of the relocatable expression
+ * returned in the Value field. It is possible that some symbols in the
+ * relocatable expression were assembly temporary symbols, for example
+ * "Ldata - LpicBase + constant", and only the Values of the symbols without
+ * symbol names are present in the relocation information. The VariantKind
+ * type is one of the Target specific #defines below and is used to print
+ * operands like "_foo@GOT", ":lower16:_foo", etc.
+ */
+struct LLVMOpInfoSymbol1 {
+ uint64_t Present; /* 1 if this symbol is present */
+ char *Name; /* symbol name if not NULL */
+ uint64_t Value; /* symbol value if name is NULL */
+};
+struct LLVMOpInfo1 {
+ struct LLVMOpInfoSymbol1 AddSymbol;
+ struct LLVMOpInfoSymbol1 SubtractSymbol;
+ uint64_t Value;
+ uint64_t VariantKind;
+};
+
+/**
+ * The operand VariantKinds for symbolic disassembly.
+ */
+#define LLVMDisassembler_VariantKind_None 0 /* all targets */
+
+/**
+ * The ARM target VariantKinds.
+ */
+#define LLVMDisassembler_VariantKind_ARM_HI16 1 /* :upper16: */
+#define LLVMDisassembler_VariantKind_ARM_LO16 2 /* :lower16: */
+
/**
* The type for the symbol lookup function. This may be called by the
* disassembler for such things like adding a comment for a PC plus a constant
#define MCDISASSEMBLER_H
#include "llvm/Support/DataTypes.h"
+#include "llvm-c/Disassembler.h"
namespace llvm {
class MCInst;
class MemoryObject;
class raw_ostream;
+class MCContext;
struct EDInstInfo;
class MCDisassembler {
public:
/// Constructor - Performs initial setup for the disassembler.
- MCDisassembler() {}
+ MCDisassembler() : GetOpInfo(0), DisInfo(0), Ctx(0) {}
virtual ~MCDisassembler();
/// each MCInst opcode this disassembler returns.
/// NULL if there is no info for this target.
virtual EDInstInfo *getEDInfo() const { return (EDInstInfo*)0; }
+
+private:
+ //
+ // Hooks for symbolic disassembly via the public 'C' interface.
+ //
+ // The function to get the symbolic information for operands.
+ LLVMOpInfoCallback GetOpInfo;
+ // The pointer to the block of symbolic information for above call back.
+ void *DisInfo;
+ // The assembly context for creating symbols and MCExprs in place of
+ // immediate operands when there is symbolic information.
+ MCContext *Ctx;
+
+public:
+ void setupForSymbolicDisassembly(LLVMOpInfoCallback getOpInfo,
+ void *disInfo,
+ MCContext *ctx) {
+ GetOpInfo = getOpInfo;
+ DisInfo = disInfo;
+ Ctx = ctx;
+ }
+ LLVMOpInfoCallback getLLVMOpInfoCallback() const { return GetOpInfo; }
+ void *getDisInfoBlock() const { return DisInfo; }
+ MCContext *getMCContext() const { return Ctx; }
};
} // namespace llvm
assert(Ctx && "Unable to create MCContext!");
// Set up disassembler.
- const MCDisassembler *DisAsm = TheTarget->createMCDisassembler();
+ MCDisassembler *DisAsm = TheTarget->createMCDisassembler();
assert(DisAsm && "Unable to create disassembler!");
+ DisAsm->setupForSymbolicDisassembly(GetOpInfo, DisInfo, Ctx);
// Set up the instruction printer.
int AsmPrinterVariant = MAI->getAssemblerDialect();
public:
LLVMDisasmContext(std::string tripleName, void *disInfo, int tagType,
- LLVMOpInfoCallback getOpInfo,
+ LLVMOpInfoCallback getOpInfo,
LLVMSymbolLookupCallback symbolLookUp,
const Target *theTarget, const MCAsmInfo *mAI,
llvm::TargetMachine *tM, const TargetAsmInfo *tai,
if (!Builder)
return false;
+ Builder->setupBuilderForSymbolicDisassembly(getLLVMOpInfoCallback(),
+ getDisInfoBlock(), getMCContext(),
+ Address);
+
if (!Builder->Build(MI, insn))
return false;
Builder->SetSession(const_cast<Session *>(&SO));
+ Builder->setupBuilderForSymbolicDisassembly(getLLVMOpInfoCallback(),
+ getDisInfoBlock(), getMCContext(),
+ Address);
+
if (!Builder->Build(MI, insn))
return false;
#include "ARMDisassemblerCore.h"
#include "ARMAddressingModes.h"
+#include "ARMMCExpr.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
// We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
- MI.addOperand(MCOperand::CreateImm(Imm16));
+ if (!B->tryAddingSymbolicOperand(Imm16, 4, MI))
+ MI.addOperand(MCOperand::CreateImm(Imm16));
++OpIdx;
} else {
// We have a reg/imm form.
return new ARMBasicMCBuilder(Opcode, Format,
ARMInsts[Opcode].getNumOperands());
}
+
+/// tryAddingSymbolicOperand - tryAddingSymbolicOperand trys to add a symbolic
+/// operand in place of the immediate Value in the MCInst. The immediate
+/// Value has had any PC adjustment made by the caller. If the getOpInfo()
+/// function was set as part of the setupBuilderForSymbolicDisassembly() call
+/// then that function is called to get any symbolic information at the
+/// builder's Address for this instrution. If that returns non-zero then the
+/// symbolic information is returns is used to create an MCExpr and that is
+/// added as an operand to the MCInst. This function returns true if it adds
+/// an operand to the MCInst and false otherwise.
+bool ARMBasicMCBuilder::tryAddingSymbolicOperand(uint64_t Value,
+ uint64_t InstSize,
+ MCInst &MI) {
+ if (!GetOpInfo)
+ return false;
+
+ struct LLVMOpInfo1 SymbolicOp;
+ SymbolicOp.Value = Value;
+ if (!GetOpInfo(DisInfo, Address, 0 /* Offset */, InstSize, 1, &SymbolicOp))
+ return false;
+
+ const MCExpr *Add = NULL;
+ if (SymbolicOp.AddSymbol.Present) {
+ if (SymbolicOp.AddSymbol.Name) {
+ StringRef Name(SymbolicOp.AddSymbol.Name);
+ MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name);
+ Add = MCSymbolRefExpr::Create(Sym, *Ctx);
+ } else {
+ Add = MCConstantExpr::Create(SymbolicOp.AddSymbol.Value, *Ctx);
+ }
+ }
+
+ const MCExpr *Sub = NULL;
+ if (SymbolicOp.SubtractSymbol.Present) {
+ if (SymbolicOp.SubtractSymbol.Name) {
+ StringRef Name(SymbolicOp.SubtractSymbol.Name);
+ MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name);
+ Sub = MCSymbolRefExpr::Create(Sym, *Ctx);
+ } else {
+ Sub = MCConstantExpr::Create(SymbolicOp.SubtractSymbol.Value, *Ctx);
+ }
+ }
+
+ const MCExpr *Off = NULL;
+ if (SymbolicOp.Value != 0)
+ Off = MCConstantExpr::Create(SymbolicOp.Value, *Ctx);
+
+ const MCExpr *Expr;
+ if (Sub) {
+ const MCExpr *LHS;
+ if (Add)
+ LHS = MCBinaryExpr::CreateSub(Add, Sub, *Ctx);
+ else
+ LHS = MCUnaryExpr::CreateMinus(Sub, *Ctx);
+ if (Off != 0)
+ Expr = MCBinaryExpr::CreateAdd(LHS, Off, *Ctx);
+ else
+ Expr = LHS;
+ } else if (Add) {
+ if (Off != 0)
+ Expr = MCBinaryExpr::CreateAdd(Add, Off, *Ctx);
+ else
+ Expr = Add;
+ } else
+ Expr = Off;
+
+ if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_HI16)
+ MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateUpper16(Expr, *Ctx)));
+ else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_LO16)
+ MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateLower16(Expr, *Ctx)));
+ else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_None)
+ MI.addOperand(MCOperand::CreateExpr(Expr));
+ else
+ assert("bad SymbolicOp.VariantKind");
+
+ return true;
+}
#define ARMDISASSEMBLERCORE_H
#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCContext.h"
#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm-c/Disassembler.h"
#include "ARMBaseInstrInfo.h"
#include "ARMRegisterInfo.h"
#include "ARMDisassembler.h"
namespace llvm {
+class MCContext;
class ARMUtils {
public:
public:
ARMBasicMCBuilder(ARMBasicMCBuilder &B)
: Opcode(B.Opcode), Format(B.Format), NumOps(B.NumOps), Disasm(B.Disasm),
- SP(B.SP) {
+ SP(B.SP), GetOpInfo(0), DisInfo(0), Ctx(0) {
Err = 0;
}
assert(SP);
return slice(SP->ITState, 7, 4);
}
+
+private:
+ //
+ // Hooks for symbolic disassembly via the public 'C' interface.
+ //
+ // The function to get the symbolic information for operands.
+ LLVMOpInfoCallback GetOpInfo;
+ // The pointer to the block of symbolic information for above call back.
+ void *DisInfo;
+ // The assembly context for creating symbols and MCExprs in place of
+ // immediate operands when there is symbolic information.
+ MCContext *Ctx;
+ // The address of the instruction being disassembled.
+ uint64_t Address;
+
+public:
+ void setupBuilderForSymbolicDisassembly(LLVMOpInfoCallback getOpInfo,
+ void *disInfo, MCContext *ctx,
+ uint64_t address) {
+ GetOpInfo = getOpInfo;
+ DisInfo = disInfo;
+ Ctx = ctx;
+ Address = address;
+ }
+
+ uint64_t getBuilderAddress() const { return Address; }
+
+ /// tryAddingSymbolicOperand - tryAddingSymbolicOperand trys to add a symbolic
+ /// operand in place of the immediate Value in the MCInst. The immediate
+ /// Value has had any PC adjustment made by the caller. If the getOpInfo()
+ /// function was set as part of the setupBuilderForSymbolicDisassembly() call
+ /// then that function is called to get any symbolic information at the
+ /// builder's Address for this instrution. If that returns non-zero then the
+ /// symbolic information is returns is used to create an MCExpr and that is
+ /// added as an operand to the MCInst. This function returns true if it adds
+ /// an operand to the MCInst and false otherwise.
+ bool tryAddingSymbolicOperand(uint64_t Value, uint64_t InstSize, MCInst &MI);
+
};
} // namespace llvm
if (Opcode == ARM::t2ADDri12 || Opcode == ARM::t2SUBri12
|| Opcode == ARM::t2LEApcrel)
MI.addOperand(MCOperand::CreateImm(getIImm3Imm8(insn)));
- else if (Opcode == ARM::t2MOVi16 || Opcode == ARM::t2MOVTi16)
- MI.addOperand(MCOperand::CreateImm(getImm16(insn)));
- else if (Opcode == ARM::t2BFC || Opcode == ARM::t2BFI) {
+ else if (Opcode == ARM::t2MOVi16 || Opcode == ARM::t2MOVTi16) {
+ if (!B->tryAddingSymbolicOperand(getImm16(insn), 4, MI))
+ MI.addOperand(MCOperand::CreateImm(getImm16(insn)));
+ } else if (Opcode == ARM::t2BFC || Opcode == ARM::t2BFI) {
uint32_t mask = 0;
if (getBitfieldInvMask(insn, mask))
MI.addOperand(MCOperand::CreateImm(mask));
Offset = decodeImm32_BLX(insn);
break;
}
- MI.addOperand(MCOperand::CreateImm(Offset));
+
+ if (!B->tryAddingSymbolicOperand(Offset + B->getBuilderAddress() + 4, 4, MI))
+ MI.addOperand(MCOperand::CreateImm(Offset));
// This is an increment as some predicate operands may have been added first.
NumOpsAdded += 1;
projects / oota-llvm.git / commitdiff