unsigned Opcode = 0;
SMLoc Loc;
SmallVector<MCOperand, 8> Operands;
+ // These flags could be used to pass some info from one target subcomponent
+ // to another, for example, from disassembler to asm printer. The values of
+ // the flags have any sense on target level only (e.g. prefixes on x86).
+ unsigned Flags = 0;
public:
MCInst() = default;
void setOpcode(unsigned Op) { Opcode = Op; }
unsigned getOpcode() const { return Opcode; }
+ void setFlags(unsigned F) { Flags = F; }
+ unsigned getFlags() const { return Flags; }
+
void setLoc(SMLoc loc) { Loc = loc; }
SMLoc getLoc() const { return Loc; }
}
}
- Operands.push_back(X86Operand::CreateToken(PatchedName, NameLoc));
// Determine whether this is an instruction prefix.
// FIXME:
// lock addq %rax, %rbx ; Destination operand must be of memory type
// xacquire <insn> ; xacquire must be accompanied by 'lock'
bool isPrefix = StringSwitch<bool>(Name)
- .Cases("lock",
- "rep", "repe",
- "repz", "repne",
- "repnz", "rex64",
- "data32", "data16", true)
- .Cases("xacquire", "xrelease", true)
- .Cases("acquire", "release", isParsingIntelSyntax())
- .Default(false);
+ .Cases("rex64", "data32", "data16", true)
+ .Cases("xacquire", "xrelease", true)
+ .Cases("acquire", "release", isParsingIntelSyntax())
+ .Default(false);
+
+ auto isLockRepeatPrefix = [](StringRef N) {
+ return StringSwitch<bool>(N)
+ .Cases("lock", "rep", "repe", "repz", "repne", "repnz", true)
+ .Default(false);
+ };
bool CurlyAsEndOfStatement = false;
+
+ unsigned Flags = X86::IP_NO_PREFIX;
+ while (isLockRepeatPrefix(Name.lower())) {
+ unsigned Prefix =
+ StringSwitch<unsigned>(Name)
+ .Cases("lock", "lock", X86::IP_HAS_LOCK)
+ .Cases("rep", "repe", "repz", X86::IP_HAS_REPEAT)
+ .Cases("repne", "repnz", X86::IP_HAS_REPEAT_NE)
+ .Default(X86::IP_NO_PREFIX); // Invalid prefix (impossible)
+ Flags |= Prefix;
+ Name = Parser.getTok().getString();
+ Parser.Lex(); // eat the prefix
+ // Hack: we could have something like
+ // "lock; cmpxchg16b $1" or "lock\0A\09incl" or "lock/incl"
+ while (Name.startswith(";") || Name.startswith("\n") ||
+ Name.startswith("\t") or Name.startswith("/")) {
+ Name = Parser.getTok().getString();
+ Parser.Lex(); // go to next prefix or instr
+ }
+ }
+
+ if (Flags)
+ PatchedName = Name;
+ Operands.push_back(X86Operand::CreateToken(PatchedName, NameLoc));
+
// This does the actual operand parsing. Don't parse any more if we have a
// prefix juxtaposed with an operation like "lock incl 4(%rax)", because we
// just want to parse the "lock" as the first instruction and the "incl" as
// the next one.
if (getLexer().isNot(AsmToken::EndOfStatement) && !isPrefix) {
-
// Parse '*' modifier.
if (getLexer().is(AsmToken::Star))
Operands.push_back(X86Operand::CreateToken("*", consumeToken()));
}
}
+ if (Flags)
+ Operands.push_back(X86Operand::CreatePrefix(Flags, NameLoc, NameLoc));
return false;
}
return Error(IDLoc, OS.str(), SMRange(), MatchingInlineAsm);
}
+static unsigned getPrefixes(OperandVector &Operands) {
+ unsigned Result = 0;
+ X86Operand &Prefix = static_cast<X86Operand &>(*Operands.back());
+ if (Prefix.isPrefix()) {
+ Result = Prefix.getPrefix();
+ Operands.pop_back();
+ }
+ return Result;
+}
+
bool X86AsmParser::MatchAndEmitATTInstruction(SMLoc IDLoc, unsigned &Opcode,
OperandVector &Operands,
MCStreamer &Out,
MatchFPUWaitAlias(IDLoc, Op, Operands, Out, MatchingInlineAsm);
bool WasOriginallyInvalidOperand = false;
+ unsigned Prefixes = getPrefixes(Operands);
+
MCInst Inst;
+ if (Prefixes)
+ Inst.setFlags(Prefixes);
+
// First, try a direct match.
switch (MatchInstruction(Operands, Inst, ErrorInfo, MatchingInlineAsm,
isParsingIntelSyntax())) {
StringRef Mnemonic = Op.getToken();
SMRange EmptyRange = None;
StringRef Base = Op.getToken();
+ unsigned Prefixes = getPrefixes(Operands);
// First, handle aliases that expand to multiple instructions.
MatchFPUWaitAlias(IDLoc, Op, Operands, Out, MatchingInlineAsm);
MCInst Inst;
+ if (Prefixes)
+ Inst.setFlags(Prefixes);
+
// Find one unsized memory operand, if present.
X86Operand *UnsizedMemOp = nullptr;
for (const auto &Op : Operands) {
/// X86Operand - Instances of this class represent a parsed X86 machine
/// instruction.
struct X86Operand : public MCParsedAsmOperand {
- enum KindTy {
- Token,
- Register,
- Immediate,
- Memory
- } Kind;
+ enum KindTy { Token, Register, Immediate, Memory, Prefix } Kind;
SMLoc StartLoc, EndLoc;
SMLoc OffsetOfLoc;
unsigned RegNo;
};
+ struct PrefOp {
+ unsigned Prefixes;
+ };
+
struct ImmOp {
const MCExpr *Val;
};
struct RegOp Reg;
struct ImmOp Imm;
struct MemOp Mem;
+ struct PrefOp Pref;
};
X86Operand(KindTy K, SMLoc Start, SMLoc End)
return Reg.RegNo;
}
+ unsigned getPrefix() const {
+ assert(Kind == Prefix && "Invalid access!");
+ return Pref.Prefixes;
+ }
+
const MCExpr *getImm() const {
assert(Kind == Immediate && "Invalid access!");
return Imm.Val;
return isMemOffs() && Mem.ModeSize == 64 && (!Mem.Size || Mem.Size == 64);
}
+ bool isPrefix() const { return Kind == Prefix; }
bool isReg() const override { return Kind == Register; }
bool isGR32orGR64() const {
return Res;
}
+ static std::unique_ptr<X86Operand>
+ CreatePrefix(unsigned Prefixes, SMLoc StartLoc, SMLoc EndLoc) {
+ auto Res = llvm::make_unique<X86Operand>(Prefix, StartLoc, EndLoc);
+ Res->Pref.Prefixes = Prefixes;
+ return Res;
+ }
+
static std::unique_ptr<X86Operand> CreateImm(const MCExpr *Val,
SMLoc StartLoc, SMLoc EndLoc) {
auto Res = llvm::make_unique<X86Operand>(Immediate, StartLoc, EndLoc);
//
//===----------------------------------------------------------------------===//
+#include "MCTargetDesc/X86BaseInfo.h"
#include "MCTargetDesc/X86MCTargetDesc.h"
#include "X86DisassemblerDecoder.h"
#include "llvm/MC/MCContext.h"
return Fail;
} else {
Size = InternalInstr.length;
- return (!translateInstruction(Instr, InternalInstr, this)) ? Success : Fail;
+ bool Ret = translateInstruction(Instr, InternalInstr, this);
+ if (!Ret) {
+ unsigned Flags = X86::IP_NO_PREFIX;
+ if (InternalInstr.hasAdSize)
+ Flags |= X86::IP_HAS_AD_SIZE;
+ if (!InternalInstr.mandatoryPrefix) {
+ if (InternalInstr.hasOpSize)
+ Flags |= X86::IP_HAS_OP_SIZE;
+ if (InternalInstr.repeatPrefix == 0xf2)
+ Flags |= X86::IP_HAS_REPEAT_NE;
+ else if (InternalInstr.repeatPrefix == 0xf3 &&
+ // It should not be 'pause' f3 90
+ InternalInstr.opcode != 0x90)
+ Flags |= X86::IP_HAS_REPEAT;
+ }
+ Instr.setFlags(Flags);
+ }
+ return (!Ret) ? Success : Fail;
}
}
unsigned baseRegNo;
if (insn.mode == MODE_64BIT)
- baseRegNo = insn.prefixPresent[0x67] ? X86::ESI : X86::RSI;
+ baseRegNo = insn.hasAdSize ? X86::ESI : X86::RSI;
else if (insn.mode == MODE_32BIT)
- baseRegNo = insn.prefixPresent[0x67] ? X86::SI : X86::ESI;
+ baseRegNo = insn.hasAdSize ? X86::SI : X86::ESI;
else {
assert(insn.mode == MODE_16BIT);
- baseRegNo = insn.prefixPresent[0x67] ? X86::ESI : X86::SI;
+ baseRegNo = insn.hasAdSize ? X86::ESI : X86::SI;
}
MCOperand baseReg = MCOperand::createReg(baseRegNo);
mcInst.addOperand(baseReg);
unsigned baseRegNo;
if (insn.mode == MODE_64BIT)
- baseRegNo = insn.prefixPresent[0x67] ? X86::EDI : X86::RDI;
+ baseRegNo = insn.hasAdSize ? X86::EDI : X86::RDI;
else if (insn.mode == MODE_32BIT)
- baseRegNo = insn.prefixPresent[0x67] ? X86::DI : X86::EDI;
+ baseRegNo = insn.hasAdSize ? X86::DI : X86::EDI;
else {
assert(insn.mode == MODE_16BIT);
- baseRegNo = insn.prefixPresent[0x67] ? X86::EDI : X86::DI;
+ baseRegNo = insn.hasAdSize ? X86::EDI : X86::DI;
}
MCOperand baseReg = MCOperand::createReg(baseRegNo);
mcInst.addOperand(baseReg);
insn->dlog(insn->dlogArg, buffer);
}
-/*
- * setPrefixPresent - Marks that a particular prefix is present at a particular
- * location.
- *
- * @param insn - The instruction to be marked as having the prefix.
- * @param prefix - The prefix that is present.
- * @param location - The location where the prefix is located (in the address
- * space of the instruction's reader).
- */
-static void setPrefixPresent(struct InternalInstruction* insn,
- uint8_t prefix,
- uint64_t location)
-{
- insn->prefixPresent[prefix] = 1;
- insn->prefixLocations[prefix] = location;
+static bool isREX(struct InternalInstruction *insn, uint8_t prefix) {
+ if (insn->mode == MODE_64BIT)
+ return prefix >= 0x40 && prefix <= 0x4f;
+ return false;
}
/*
- * isPrefixAtLocation - Queries an instruction to determine whether a prefix is
- * present at a given location.
+ * setPrefixPresent - Marks that a particular prefix is present as mandatory
*
- * @param insn - The instruction to be queried.
- * @param prefix - The prefix.
- * @param location - The location to query.
- * @return - Whether the prefix is at that location.
+ * @param insn - The instruction to be marked as having the prefix.
+ * @param prefix - The prefix that is present.
*/
-static bool isPrefixAtLocation(struct InternalInstruction* insn,
- uint8_t prefix,
- uint64_t location)
-{
- return insn->prefixPresent[prefix] == 1 &&
- insn->prefixLocations[prefix] == location;
+static void setPrefixPresent(struct InternalInstruction *insn, uint8_t prefix) {
+ uint8_t nextByte;
+ switch (prefix) {
+ case 0xf2:
+ case 0xf3:
+ if (lookAtByte(insn, &nextByte))
+ break;
+ // TODO:
+ // 1. There could be several 0x66
+ // 2. if (nextByte == 0x66) and nextNextByte != 0x0f then
+ // it's not mandatory prefix
+ // 3. if (nextByte >= 0x40 && nextByte <= 0x4f) it's REX and we need
+ // 0x0f exactly after it to be mandatory prefix
+ if (isREX(insn, nextByte) || nextByte == 0x0f || nextByte == 0x66)
+ // The last of 0xf2 /0xf3 is mandatory prefix
+ insn->mandatoryPrefix = prefix;
+ insn->repeatPrefix = prefix;
+ break;
+ case 0x66:
+ if (lookAtByte(insn, &nextByte))
+ break;
+ // 0x66 can't overwrite existing mandatory prefix and should be ignored
+ if (!insn->mandatoryPrefix && (nextByte == 0x0f || isREX(insn, nextByte)))
+ insn->mandatoryPrefix = prefix;
+ break;
+ }
}
/*
*/
static int readPrefixes(struct InternalInstruction* insn) {
bool isPrefix = true;
- bool prefixGroups[4] = { false };
- uint64_t prefixLocation;
uint8_t byte = 0;
uint8_t nextByte;
- bool hasAdSize = false;
- bool hasOpSize = false;
-
dbgprintf(insn, "readPrefixes()");
while (isPrefix) {
- prefixLocation = insn->readerCursor;
-
/* If we fail reading prefixes, just stop here and let the opcode reader deal with it */
if (consumeByte(insn, &byte))
break;
* If the byte is a LOCK/REP/REPNE prefix and not a part of the opcode, then
* break and let it be disassembled as a normal "instruction".
*/
- if (insn->readerCursor - 1 == insn->startLocation && byte == 0xf0)
+ if (insn->readerCursor - 1 == insn->startLocation && byte == 0xf0) // LOCK
break;
- if (insn->readerCursor - 1 == insn->startLocation
- && (byte == 0xf2 || byte == 0xf3)
- && !lookAtByte(insn, &nextByte))
- {
+ if ((byte == 0xf2 || byte == 0xf3) && !lookAtByte(insn, &nextByte)) {
/*
* If the byte is 0xf2 or 0xf3, and any of the following conditions are
* met:
* - it is followed by an xchg instruction
* then it should be disassembled as a xacquire/xrelease not repne/rep.
*/
- if ((byte == 0xf2 || byte == 0xf3) &&
- ((nextByte == 0xf0) ||
- ((nextByte & 0xfe) == 0x86 || (nextByte & 0xf8) == 0x90)))
+ if (((nextByte == 0xf0) ||
+ ((nextByte & 0xfe) == 0x86 || (nextByte & 0xf8) == 0x90))) {
insn->xAcquireRelease = true;
+ if (!(byte == 0xf3 && nextByte == 0x90)) // PAUSE instruction support
+ break;
+ }
/*
* Also if the byte is 0xf3, and the following condition is met:
* - it is followed by a "mov mem, reg" (opcode 0x88/0x89) or
* "mov mem, imm" (opcode 0xc6/0xc7) instructions.
* then it should be disassembled as an xrelease not rep.
*/
- if (byte == 0xf3 &&
- (nextByte == 0x88 || nextByte == 0x89 ||
- nextByte == 0xc6 || nextByte == 0xc7))
+ if (byte == 0xf3 && (nextByte == 0x88 || nextByte == 0x89 ||
+ nextByte == 0xc6 || nextByte == 0xc7)) {
insn->xAcquireRelease = true;
- if (insn->mode == MODE_64BIT && (nextByte & 0xf0) == 0x40) {
- if (consumeByte(insn, &nextByte))
+ if (nextByte != 0x90) // PAUSE instruction support
+ break;
+ }
+ if (isREX(insn, nextByte)) {
+ uint8_t nnextByte;
+ // Go to REX prefix after the current one
+ if (consumeByte(insn, &nnextByte))
return -1;
- if (lookAtByte(insn, &nextByte))
+ // We should be able to read next byte after REX prefix
+ if (lookAtByte(insn, &nnextByte))
return -1;
unconsumeByte(insn);
}
- if (nextByte != 0x0f && nextByte != 0x90)
- break;
}
switch (byte) {
case 0xf0: /* LOCK */
case 0xf2: /* REPNE/REPNZ */
case 0xf3: /* REP or REPE/REPZ */
- if (prefixGroups[0])
- dbgprintf(insn, "Redundant Group 1 prefix");
- prefixGroups[0] = true;
- setPrefixPresent(insn, byte, prefixLocation);
+ setPrefixPresent(insn, byte);
break;
case 0x2e: /* CS segment override -OR- Branch not taken */
case 0x36: /* SS segment override -OR- Branch taken */
debug("Unhandled override");
return -1;
}
- if (prefixGroups[1])
- dbgprintf(insn, "Redundant Group 2 prefix");
- prefixGroups[1] = true;
- setPrefixPresent(insn, byte, prefixLocation);
+ setPrefixPresent(insn, byte);
break;
case 0x66: /* Operand-size override */
- if (prefixGroups[2])
- dbgprintf(insn, "Redundant Group 3 prefix");
- prefixGroups[2] = true;
- hasOpSize = true;
- setPrefixPresent(insn, byte, prefixLocation);
+ insn->hasOpSize = true;
+ setPrefixPresent(insn, byte);
break;
case 0x67: /* Address-size override */
- if (prefixGroups[3])
- dbgprintf(insn, "Redundant Group 4 prefix");
- prefixGroups[3] = true;
- hasAdSize = true;
- setPrefixPresent(insn, byte, prefixLocation);
+ insn->hasAdSize = true;
+ setPrefixPresent(insn, byte);
break;
default: /* Not a prefix byte */
isPrefix = false;
} else {
unconsumeByte(insn); /* unconsume byte1 */
unconsumeByte(insn); /* unconsume byte */
- insn->necessaryPrefixLocation = insn->readerCursor - 2;
}
if (insn->vectorExtensionType == TYPE_EVEX) {
return -1;
}
- if (insn->mode == MODE_64BIT || (byte1 & 0xc0) == 0xc0) {
+ if (insn->mode == MODE_64BIT || (byte1 & 0xc0) == 0xc0)
insn->vectorExtensionType = TYPE_VEX_3B;
- insn->necessaryPrefixLocation = insn->readerCursor - 1;
- } else {
+ else
unconsumeByte(insn);
- insn->necessaryPrefixLocation = insn->readerCursor - 1;
- }
if (insn->vectorExtensionType == TYPE_VEX_3B) {
insn->vectorExtensionPrefix[0] = byte;
/* We simulate the REX prefix for simplicity's sake */
- if (insn->mode == MODE_64BIT) {
+ if (insn->mode == MODE_64BIT)
insn->rexPrefix = 0x40
| (wFromVEX3of3(insn->vectorExtensionPrefix[2]) << 3)
| (rFromVEX2of3(insn->vectorExtensionPrefix[1]) << 2)
| (xFromVEX2of3(insn->vectorExtensionPrefix[1]) << 1)
| (bFromVEX2of3(insn->vectorExtensionPrefix[1]) << 0);
- }
dbgprintf(insn, "Found VEX prefix 0x%hhx 0x%hhx 0x%hhx",
insn->vectorExtensionPrefix[0], insn->vectorExtensionPrefix[1],
return -1;
}
- if (insn->mode == MODE_64BIT || (byte1 & 0xc0) == 0xc0) {
+ if (insn->mode == MODE_64BIT || (byte1 & 0xc0) == 0xc0)
insn->vectorExtensionType = TYPE_VEX_2B;
- } else {
+ else
unconsumeByte(insn);
- }
if (insn->vectorExtensionType == TYPE_VEX_2B) {
insn->vectorExtensionPrefix[0] = byte;
consumeByte(insn, &insn->vectorExtensionPrefix[1]);
- if (insn->mode == MODE_64BIT) {
+ if (insn->mode == MODE_64BIT)
insn->rexPrefix = 0x40
| (rFromVEX2of2(insn->vectorExtensionPrefix[1]) << 2);
- }
switch (ppFromVEX2of2(insn->vectorExtensionPrefix[1])) {
default:
break;
case VEX_PREFIX_66:
- hasOpSize = true;
+ insn->hasOpSize = true;
break;
}
return -1;
}
- if ((byte1 & 0x38) != 0x0) { /* 0 in these 3 bits is a POP instruction. */
+ if ((byte1 & 0x38) != 0x0) /* 0 in these 3 bits is a POP instruction. */
insn->vectorExtensionType = TYPE_XOP;
- insn->necessaryPrefixLocation = insn->readerCursor - 1;
- } else {
+ else
unconsumeByte(insn);
- insn->necessaryPrefixLocation = insn->readerCursor - 1;
- }
if (insn->vectorExtensionType == TYPE_XOP) {
insn->vectorExtensionPrefix[0] = byte;
/* We simulate the REX prefix for simplicity's sake */
- if (insn->mode == MODE_64BIT) {
+ if (insn->mode == MODE_64BIT)
insn->rexPrefix = 0x40
| (wFromXOP3of3(insn->vectorExtensionPrefix[2]) << 3)
| (rFromXOP2of3(insn->vectorExtensionPrefix[1]) << 2)
| (xFromXOP2of3(insn->vectorExtensionPrefix[1]) << 1)
| (bFromXOP2of3(insn->vectorExtensionPrefix[1]) << 0);
- }
switch (ppFromXOP3of3(insn->vectorExtensionPrefix[2])) {
default:
break;
case VEX_PREFIX_66:
- hasOpSize = true;
+ insn->hasOpSize = true;
break;
}
insn->vectorExtensionPrefix[0], insn->vectorExtensionPrefix[1],
insn->vectorExtensionPrefix[2]);
}
- } else {
- if (insn->mode == MODE_64BIT) {
- if ((byte & 0xf0) == 0x40) {
- uint8_t opcodeByte;
-
- if (lookAtByte(insn, &opcodeByte) || ((opcodeByte & 0xf0) == 0x40)) {
- dbgprintf(insn, "Redundant REX prefix");
- return -1;
- }
-
- insn->rexPrefix = byte;
- insn->necessaryPrefixLocation = insn->readerCursor - 2;
-
- dbgprintf(insn, "Found REX prefix 0x%hhx", byte);
- } else {
- unconsumeByte(insn);
- insn->necessaryPrefixLocation = insn->readerCursor - 1;
- }
- } else {
- unconsumeByte(insn);
- insn->necessaryPrefixLocation = insn->readerCursor - 1;
- }
- }
+ } else if (isREX(insn, byte)) {
+ if (lookAtByte(insn, &nextByte))
+ return -1;
+ insn->rexPrefix = byte;
+ dbgprintf(insn, "Found REX prefix 0x%hhx", byte);
+ } else
+ unconsumeByte(insn);
if (insn->mode == MODE_16BIT) {
- insn->registerSize = (hasOpSize ? 4 : 2);
- insn->addressSize = (hasAdSize ? 4 : 2);
- insn->displacementSize = (hasAdSize ? 4 : 2);
- insn->immediateSize = (hasOpSize ? 4 : 2);
+ insn->registerSize = (insn->hasOpSize ? 4 : 2);
+ insn->addressSize = (insn->hasAdSize ? 4 : 2);
+ insn->displacementSize = (insn->hasAdSize ? 4 : 2);
+ insn->immediateSize = (insn->hasOpSize ? 4 : 2);
} else if (insn->mode == MODE_32BIT) {
- insn->registerSize = (hasOpSize ? 2 : 4);
- insn->addressSize = (hasAdSize ? 2 : 4);
- insn->displacementSize = (hasAdSize ? 2 : 4);
- insn->immediateSize = (hasOpSize ? 2 : 4);
+ insn->registerSize = (insn->hasOpSize ? 2 : 4);
+ insn->addressSize = (insn->hasAdSize ? 2 : 4);
+ insn->displacementSize = (insn->hasAdSize ? 2 : 4);
+ insn->immediateSize = (insn->hasOpSize ? 2 : 4);
} else if (insn->mode == MODE_64BIT) {
if (insn->rexPrefix && wFromREX(insn->rexPrefix)) {
insn->registerSize = 8;
- insn->addressSize = (hasAdSize ? 4 : 8);
+ insn->addressSize = (insn->hasAdSize ? 4 : 8);
insn->displacementSize = 4;
insn->immediateSize = 4;
} else {
- insn->registerSize = (hasOpSize ? 2 : 4);
- insn->addressSize = (hasAdSize ? 4 : 8);
- insn->displacementSize = (hasOpSize ? 2 : 4);
- insn->immediateSize = (hasOpSize ? 2 : 4);
+ insn->registerSize = (insn->hasOpSize ? 2 : 4);
+ insn->addressSize = (insn->hasAdSize ? 4 : 8);
+ insn->displacementSize = (insn->hasOpSize ? 2 : 4);
+ insn->immediateSize = (insn->hasOpSize ? 2 : 4);
}
}
insn->opcodeType = TWOBYTE;
}
- }
+ } else if (insn->mandatoryPrefix)
+ // The opcode with mandatory prefix must start with opcode escape.
+ // If not it's legacy repeat prefix
+ insn->mandatoryPrefix = 0;
/*
* At this point we have consumed the full opcode.
} else {
return -1;
}
- } else {
- if (insn->mode != MODE_16BIT && isPrefixAtLocation(insn, 0x66, insn->necessaryPrefixLocation))
+ } else if (!insn->mandatoryPrefix) {
+ // If we don't have mandatory prefix we should use legacy prefixes here
+ if (insn->hasOpSize && (insn->mode != MODE_16BIT))
attrMask |= ATTR_OPSIZE;
- else if (isPrefixAtLocation(insn, 0x67, insn->necessaryPrefixLocation))
+ if (insn->hasAdSize)
attrMask |= ATTR_ADSIZE;
- else if (isPrefixAtLocation(insn, 0xf3, insn->necessaryPrefixLocation))
- attrMask |= ATTR_XS;
- else if (isPrefixAtLocation(insn, 0xf2, insn->necessaryPrefixLocation))
+ if (insn->opcodeType == ONEBYTE) {
+ if (insn->repeatPrefix == 0xf3 && (insn->opcode == 0x90))
+ // Special support for PAUSE
+ attrMask |= ATTR_XS;
+ } else {
+ if (insn->repeatPrefix == 0xf2)
+ attrMask |= ATTR_XD;
+ else if (insn->repeatPrefix == 0xf3)
+ attrMask |= ATTR_XS;
+ }
+ } else {
+ switch (insn->mandatoryPrefix) {
+ case 0xf2:
attrMask |= ATTR_XD;
+ break;
+ case 0xf3:
+ attrMask |= ATTR_XS;
+ break;
+ case 0x66:
+ if (insn->mode != MODE_16BIT)
+ attrMask |= ATTR_OPSIZE;
+ break;
+ case 0x67:
+ attrMask |= ATTR_ADSIZE;
+ break;
+ }
}
if (insn->rexPrefix & 0x08)
* CALL/JMP/JCC instructions need to ignore 0x66 and consume 4 bytes
*/
- if (insn->mode == MODE_64BIT &&
- isPrefixAtLocation(insn, 0x66, insn->necessaryPrefixLocation)) {
+ if ((insn->mode == MODE_64BIT) && insn->hasOpSize) {
switch (insn->opcode) {
case 0xE8:
case 0xE9:
*/
if (insn->opcodeType == ONEBYTE && ((insn->opcode & 0xFC) == 0xA0)) {
/* Make sure we observed the prefixes in any position. */
- if (insn->prefixPresent[0x67])
+ if (insn->hasAdSize)
attrMask |= ATTR_ADSIZE;
- if (insn->prefixPresent[0x66])
+ if (insn->hasOpSize)
attrMask |= ATTR_OPSIZE;
/* In 16-bit, invert the attributes. */
return 0;
}
- if ((insn->mode == MODE_16BIT || insn->prefixPresent[0x66]) &&
+ if ((insn->mode == MODE_16BIT || insn->hasOpSize) &&
!(attrMask & ATTR_OPSIZE)) {
/*
* The instruction tables make no distinction between instructions that
specWithOpSizeName = GetInstrName(instructionIDWithOpsize, miiArg);
if (is16BitEquivalent(specName.data(), specWithOpSizeName.data()) &&
- (insn->mode == MODE_16BIT) ^ insn->prefixPresent[0x66]) {
+ (insn->mode == MODE_16BIT) ^ insn->hasOpSize) {
insn->instructionID = instructionIDWithOpsize;
insn->spec = specifierForUID(instructionIDWithOpsize);
} else {
// Prefix state
- // 1 if the prefix byte corresponding to the entry is present; 0 if not
- uint8_t prefixPresent[0x100];
- // contains the location (for use with the reader) of the prefix byte
- uint64_t prefixLocations[0x100];
+ // The possible mandatory prefix
+ uint8_t mandatoryPrefix;
// The value of the vector extension prefix(EVEX/VEX/XOP), if present
uint8_t vectorExtensionPrefix[4];
// The type of the vector extension prefix
VectorExtensionType vectorExtensionType;
// The value of the REX prefix, if present
uint8_t rexPrefix;
- // The location where a mandatory prefix would have to be (i.e., right before
- // the opcode, or right before the REX prefix if one is present).
- uint64_t necessaryPrefixLocation;
// The segment override type
SegmentOverride segmentOverride;
// 1 if the prefix byte, 0xf2 or 0xf3 is xacquire or xrelease
bool xAcquireRelease;
+ // Address-size override
+ bool hasAdSize;
+ // Operand-size override
+ bool hasOpSize;
+ // The repeat prefix if any
+ uint8_t repeatPrefix;
+
// Sizes of various critical pieces of data, in bytes
uint8_t registerSize;
uint8_t addressSize;
HasCustomInstComment =
EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
+ unsigned Flags = MI->getFlags();
if (TSFlags & X86II::LOCK)
OS << "\tlock\t";
+ if (!(TSFlags & X86II::LOCK) && Flags & X86::IP_HAS_LOCK)
+ OS << "\tlock\n";
+
+ if (Flags & X86::IP_HAS_REPEAT_NE)
+ OS << "\trepne\n";
+ else if (Flags & X86::IP_HAS_REPEAT)
+ OS << "\trep\n";
// Output CALLpcrel32 as "callq" in 64-bit mode.
// In Intel annotation it's always emitted as "call".
if (TSFlags & X86II::LOCK)
OS << "\tlock\n";
+ unsigned Flags = MI->getFlags();
+ if (Flags & X86::IP_HAS_REPEAT_NE)
+ OS << "\trepne\n";
+ else if (Flags & X86::IP_HAS_REPEAT)
+ OS << "\trep\n";
+
printInstruction(MI, OS);
// Next always print the annotation.
TO_ZERO = 3,
CUR_DIRECTION = 4
};
+
+ /// The constants to describe instr prefixes if there are
+ enum IPREFIXES {
+ IP_NO_PREFIX = 0,
+ IP_HAS_OP_SIZE = 1,
+ IP_HAS_AD_SIZE = 2,
+ IP_HAS_REPEAT_NE = 4,
+ IP_HAS_REPEAT = 8,
+ IP_HAS_LOCK = 16
+ };
} // end namespace X86;
/// X86II - This namespace holds all of the target specific flags that
EmitByte(0x66, CurByte, OS);
// Emit the LOCK opcode prefix.
- if (TSFlags & X86II::LOCK)
+ if (TSFlags & X86II::LOCK || MI.getFlags() & X86::IP_HAS_LOCK)
EmitByte(0xF0, CurByte, OS);
switch (TSFlags & X86II::OpPrefixMask) {
unsigned Opcode = MI.getOpcode();
const MCInstrDesc &Desc = MCII.get(Opcode);
uint64_t TSFlags = Desc.TSFlags;
+ unsigned Flags = MI.getFlags();
// Pseudo instructions don't get encoded.
if ((TSFlags & X86II::FormMask) == X86II::Pseudo)
MI, OS);
// Emit the repeat opcode prefix as needed.
- if (TSFlags & X86II::REP)
+ if (TSFlags & X86II::REP || Flags & X86::IP_HAS_REPEAT)
EmitByte(0xF3, CurByte, OS);
+ if (Flags & X86::IP_HAS_REPEAT_NE)
+ EmitByte(0xF2, CurByte, OS);
// Emit the address size opcode prefix as needed.
bool need_address_override;
# RUN: llvm-mc --disassemble %s -triple=x86_64 | FileCheck %s
+# CHECK: rep
+# CHECK-NEXT: insb %dx, %es:(%rdi)
+0xf3 0x6c #rep ins
+# CHECK: rep
+# CHECK-NEXT: insl %dx, %es:(%rdi)
+0xf3 0x6d #rep ins
+# CHECK: rep
+# CHECK-NEXT: movsb (%rsi), %es:(%rdi)
+0xf3 0xa4 #rep movs
+# CHECK: rep
+# CHECK-NEXT: movsl (%rsi), %es:(%rdi)
+0xf3 0xa5 #rep movs
+# CHECK: rep
+# CHECK-NEXT: outsb (%rsi), %dx
+0xf3 0x6e #rep outs
+# CHECK: rep
+# CHECK-NEXT: outsl (%rsi), %dx
+0xf3 0x6f #rep outs
+# CHECK: rep
+# CHECK-NEXT: lodsb (%rsi), %al
+0xf3 0xac #rep lods
+# CHECK: rep
+# CHECK-NEXT: lodsl (%rsi), %eax
+0xf3 0xad #rep lods
+# CHECK: rep
+# CHECK-NEXT: stosb %al, %es:(%rdi)
+0xf3 0xaa #rep stos
+# CHECK: rep
+# CHECK-NEXT: stosl %eax, %es:(%rdi)
+0xf3 0xab #rep stos
+# CHECK: rep
+# CHECK-NEXT: cmpsb %es:(%rdi), (%rsi)
+0xf3 0xa6 #rep cmps
+# CHECK: rep
+# CHECK-NEXT: cmpsl %es:(%rdi), (%rsi)
+0xf3 0xa7 #repe cmps
+# CHECK: rep
+# CHECK-NEXT: scasb %es:(%rdi), %al
+0xf3 0xae #repe scas
+# CHECK: rep
+# CHECK-NEXT: scasl %es:(%rdi), %eax
+0xf3 0xaf #repe scas
+# CHECK: repne
+# CHECK-NEXT: cmpsb %es:(%rdi), (%rsi)
+0xf2 0xa6 #repne cmps
+# CHECK: repne
+# CHECK-NEXT: cmpsl %es:(%rdi), (%rsi)
+0xf2 0xa7 #repne cmps
+# CHECK: repne
+# CHECK-NEXT: scasb %es:(%rdi), %al
+0xf2 0xae #repne scas
+# CHECK: repne
+# CHECK-NEXT: scasl %es:(%rdi), %eax
+0xf2 0xaf #repne scas
+
# CHECK: lock
# CHECK-NEXT: orl $16, %fs:776
0xf0 0x64 0x83 0x0c 0x25 0x08 0x03 0x00 0x00 0x10
# Test that multiple redundant prefixes work (redundant, but valid x86).
# CHECK: rep
-# CHECK-NEXT: rep
# CHECK-NEXT: stosq
0xf3 0xf3 0x48 0xab
# CHECK: nopw %ax
0x66 0x0f 0x1f 0xc0
+
+# CHECK: movw %bx, %cs:(%esi,%ebp)
+0x2e 0x66 0x89 0x1c 0x2e
+# CHECK: movl %ebx, %cs:(%si)
+0x2e 0x67 0x89 0x1c
+# CHECK: movl %ebx, %cs:(%esi,%ebp)
+0x2e 0x89 0x1c 0x2e
+# CHECK: movw %bx, %cs:(%si)
+0x2e 0x67 0x66 0x89 0x1c
+# CHECK: movw %bx, %cs:(%si)
+0x2e 0x66 0x67 0x89 0x1c
# CHECK: nopq %rax
0x48 0x0f 0x1f 0xC0
+
+# CHECK: xchgw %di, %ax
+0x66 0x3e 0x97
+
+# CHECK: movw %bx, %cs:(%rsi,%rbp)
+0x2e 0x66 0x89 0x1c 0x2e
+# CHECK: movl %ebx, %cs:(%esi,%ebp)
+0x2e 0x67 0x89 0x1c 0x2e
+# CHECK: movl %ebx, %cs:(%rsi,%rbp)
+0x2e 0x89 0x1c 0x2e
+# CHECK: movw %bx, %cs:(%esi,%ebp)
+0x2e 0x67 0x66 0x89 0x1c 0x2e
+# CHECK: movw %bx, %cs:(%esi,%ebp)
+0x2e 0x66 0x67 0x89 0x1c 0x2e
+
acquire lock add [rax], rax
// CHECK: encoding: [0xf2]
-// CHECK: encoding: [0xf0]
-// CHECK: encoding: [0x48,0x01,0x00]
+// CHECK: encoding: [0xf0,0x48,0x01,0x00]
release lock add [rax], rax
// CHECK: encoding: [0xf3]
-// CHECK: encoding: [0xf0]
-// CHECK: encoding: [0x48,0x01,0x00]
+// CHECK: encoding: [0xf0,0x48,0x01,0x00]
// CHECK: encoding: [0x9c]
// CHECK: encoding: [0x9d]
lock addq %rsi, (%rdi)
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: addq %rsi, (%rdi)
-// CHECK: encoding: [0x48,0x01,0x37]
+// CHECK: encoding: [0xf0,0x48,0x01,0x37]
lock subq %rsi, (%rdi)
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: subq %rsi, (%rdi)
-// CHECK: encoding: [0x48,0x29,0x37]
+// CHECK: encoding: [0xf0,0x48,0x29,0x37]
lock andq %rsi, (%rdi)
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: andq %rsi, (%rdi)
-// CHECK: encoding: [0x48,0x21,0x37]
+// CHECK: encoding: [0xf0,0x48,0x21,0x37]
lock orq %rsi, (%rdi)
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: orq %rsi, (%rdi)
-// CHECK: encoding: [0x48,0x09,0x37]
+// CHECK: encoding: [0xf0,0x48,0x09,0x37]
lock xorq %rsi, (%rdi)
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: xorq %rsi, (%rdi)
-// CHECK: encoding: [0x48,0x31,0x37]
+// CHECK: encoding: [0xf0,0x48,0x31,0x37]
xacquire lock addq %rax, (%rax)
// CHECK: xacquire
// CHECK: encoding: [0xf2]
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: addq %rax, (%rax)
-// CHECK: encoding: [0x48,0x01,0x00]
+// CHECK: encoding: [0xf0,0x48,0x01,0x00]
xrelease lock addq %rax, (%rax)
// CHECK: xrelease
// CHECK: encoding: [0xf3]
// CHECK: lock
-// CHECK: encoding: [0xf0]
// CHECK: addq %rax, (%rax)
-// CHECK: encoding: [0x48,0x01,0x00]
+// CHECK: encoding: [0xf0,0x48,0x01,0x00]
// rdar://8033482
rep movsl
// CHECK: rep
-// CHECK: encoding: [0xf3]
// CHECK: movsl
-// CHECK: encoding: [0xa5]
+// CHECK: encoding: [0xf3,0xa5]
// rdar://8403974