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qemu/disas/libvixl/a64/decoder-a64.cc
Peter Maydell 6aea44fc2b disas/libvixl: Update to libvixl 1.6 
Update our copy of libvixl to upstream 1.6. There are no
changes of any particular interest to QEMU, so this is simply
keeping up with current upstream.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1412091418-25744-1-git-send-email-peter.maydell@linaro.org
2014-10-24 12:19:11 +01:00

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// Copyright 2013, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "globals.h"
#include "utils.h"
#include "a64/decoder-a64.h"
namespace vixl {
void Decoder::DecodeInstruction(const Instruction *instr) {
if (instr->Bits(28, 27) == 0) {
VisitUnallocated(instr);
} else {
switch (instr->Bits(27, 24)) {
// 0: PC relative addressing.
case 0x0: DecodePCRelAddressing(instr); break;
// 1: Add/sub immediate.
case 0x1: DecodeAddSubImmediate(instr); break;
// A: Logical shifted register.
// Add/sub with carry.
// Conditional compare register.
// Conditional compare immediate.
// Conditional select.
// Data processing 1 source.
// Data processing 2 source.
// B: Add/sub shifted register.
// Add/sub extended register.
// Data processing 3 source.
case 0xA:
case 0xB: DecodeDataProcessing(instr); break;
// 2: Logical immediate.
// Move wide immediate.
case 0x2: DecodeLogical(instr); break;
// 3: Bitfield.
// Extract.
case 0x3: DecodeBitfieldExtract(instr); break;
// 4: Unconditional branch immediate.
// Exception generation.
// Compare and branch immediate.
// 5: Compare and branch immediate.
// Conditional branch.
// System.
// 6,7: Unconditional branch.
// Test and branch immediate.
case 0x4:
case 0x5:
case 0x6:
case 0x7: DecodeBranchSystemException(instr); break;
// 8,9: Load/store register pair post-index.
// Load register literal.
// Load/store register unscaled immediate.
// Load/store register immediate post-index.
// Load/store register immediate pre-index.
// Load/store register offset.
// Load/store exclusive.
// C,D: Load/store register pair offset.
// Load/store register pair pre-index.
// Load/store register unsigned immediate.
// Advanced SIMD.
case 0x8:
case 0x9:
case 0xC:
case 0xD: DecodeLoadStore(instr); break;
// E: FP fixed point conversion.
// FP integer conversion.
// FP data processing 1 source.
// FP compare.
// FP immediate.
// FP data processing 2 source.
// FP conditional compare.
// FP conditional select.
// Advanced SIMD.
// F: FP data processing 3 source.
// Advanced SIMD.
case 0xE:
case 0xF: DecodeFP(instr); break;
}
}
}
void Decoder::AppendVisitor(DecoderVisitor* new_visitor) {
visitors_.push_back(new_visitor);
}
void Decoder::PrependVisitor(DecoderVisitor* new_visitor) {
visitors_.push_front(new_visitor);
}
void Decoder::InsertVisitorBefore(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor) {
std::list<DecoderVisitor*>::iterator it;
for (it = visitors_.begin(); it != visitors_.end(); it++) {
if (*it == registered_visitor) {
visitors_.insert(it, new_visitor);
return;
}
}
// We reached the end of the list. The last element must be
// registered_visitor.
VIXL_ASSERT(*it == registered_visitor);
visitors_.insert(it, new_visitor);
}
void Decoder::InsertVisitorAfter(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor) {
std::list<DecoderVisitor*>::iterator it;
for (it = visitors_.begin(); it != visitors_.end(); it++) {
if (*it == registered_visitor) {
it++;
visitors_.insert(it, new_visitor);
return;
}
}
// We reached the end of the list. The last element must be
// registered_visitor.
VIXL_ASSERT(*it == registered_visitor);
visitors_.push_back(new_visitor);
}
void Decoder::RemoveVisitor(DecoderVisitor* visitor) {
visitors_.remove(visitor);
}
void Decoder::DecodePCRelAddressing(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x0);
// We know bit 28 is set, as <b28:b27> = 0 is filtered out at the top level
// decode.
VIXL_ASSERT(instr->Bit(28) == 0x1);
VisitPCRelAddressing(instr);
}
void Decoder::DecodeBranchSystemException(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0x4) ||
(instr->Bits(27, 24) == 0x5) ||
(instr->Bits(27, 24) == 0x6) ||
(instr->Bits(27, 24) == 0x7) );
switch (instr->Bits(31, 29)) {
case 0:
case 4: {
VisitUnconditionalBranch(instr);
break;
}
case 1:
case 5: {
if (instr->Bit(25) == 0) {
VisitCompareBranch(instr);
} else {
VisitTestBranch(instr);
}
break;
}
case 2: {
if (instr->Bit(25) == 0) {
if ((instr->Bit(24) == 0x1) ||
(instr->Mask(0x01000010) == 0x00000010)) {
VisitUnallocated(instr);
} else {
VisitConditionalBranch(instr);
}
} else {
VisitUnallocated(instr);
}
break;
}
case 6: {
if (instr->Bit(25) == 0) {
if (instr->Bit(24) == 0) {
if ((instr->Bits(4, 2) != 0) ||
(instr->Mask(0x00E0001D) == 0x00200001) ||
(instr->Mask(0x00E0001D) == 0x00400001) ||
(instr->Mask(0x00E0001E) == 0x00200002) ||
(instr->Mask(0x00E0001E) == 0x00400002) ||
(instr->Mask(0x00E0001C) == 0x00600000) ||
(instr->Mask(0x00E0001C) == 0x00800000) ||
(instr->Mask(0x00E0001F) == 0x00A00000) ||
(instr->Mask(0x00C0001C) == 0x00C00000)) {
VisitUnallocated(instr);
} else {
VisitException(instr);
}
} else {
if (instr->Bits(23, 22) == 0) {
const Instr masked_003FF0E0 = instr->Mask(0x003FF0E0);
if ((instr->Bits(21, 19) == 0x4) ||
(masked_003FF0E0 == 0x00033000) ||
(masked_003FF0E0 == 0x003FF020) ||
(masked_003FF0E0 == 0x003FF060) ||
(masked_003FF0E0 == 0x003FF0E0) ||
(instr->Mask(0x00388000) == 0x00008000) ||
(instr->Mask(0x0038E000) == 0x00000000) ||
(instr->Mask(0x0039E000) == 0x00002000) ||
(instr->Mask(0x003AE000) == 0x00002000) ||
(instr->Mask(0x003CE000) == 0x00042000) ||
(instr->Mask(0x003FFFC0) == 0x000320C0) ||
(instr->Mask(0x003FF100) == 0x00032100) ||
(instr->Mask(0x003FF200) == 0x00032200) ||
(instr->Mask(0x003FF400) == 0x00032400) ||
(instr->Mask(0x003FF800) == 0x00032800) ||
(instr->Mask(0x0038F000) == 0x00005000) ||
(instr->Mask(0x0038E000) == 0x00006000)) {
VisitUnallocated(instr);
} else {
VisitSystem(instr);
}
} else {
VisitUnallocated(instr);
}
}
} else {
if ((instr->Bit(24) == 0x1) ||
(instr->Bits(20, 16) != 0x1F) ||
(instr->Bits(15, 10) != 0) ||
(instr->Bits(4, 0) != 0) ||
(instr->Bits(24, 21) == 0x3) ||
(instr->Bits(24, 22) == 0x3)) {
VisitUnallocated(instr);
} else {
VisitUnconditionalBranchToRegister(instr);
}
}
break;
}
case 3:
case 7: {
VisitUnallocated(instr);
break;
}
}
}
void Decoder::DecodeLoadStore(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0x8) ||
(instr->Bits(27, 24) == 0x9) ||
(instr->Bits(27, 24) == 0xC) ||
(instr->Bits(27, 24) == 0xD) );
if (instr->Bit(24) == 0) {
if (instr->Bit(28) == 0) {
if (instr->Bit(29) == 0) {
if (instr->Bit(26) == 0) {
VisitLoadStoreExclusive(instr);
} else {
DecodeAdvSIMDLoadStore(instr);
}
} else {
if ((instr->Bits(31, 30) == 0x3) ||
(instr->Mask(0xC4400000) == 0x40000000)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(23) == 0) {
if (instr->Mask(0xC4400000) == 0xC0400000) {
VisitUnallocated(instr);
} else {
VisitLoadStorePairNonTemporal(instr);
}
} else {
VisitLoadStorePairPostIndex(instr);
}
}
}
} else {
if (instr->Bit(29) == 0) {
if (instr->Mask(0xC4000000) == 0xC4000000) {
VisitUnallocated(instr);
} else {
VisitLoadLiteral(instr);
}
} else {
if ((instr->Mask(0x84C00000) == 0x80C00000) ||
(instr->Mask(0x44800000) == 0x44800000) ||
(instr->Mask(0x84800000) == 0x84800000)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(21) == 0) {
switch (instr->Bits(11, 10)) {
case 0: {
VisitLoadStoreUnscaledOffset(instr);
break;
}
case 1: {
if (instr->Mask(0xC4C00000) == 0xC0800000) {
VisitUnallocated(instr);
} else {
VisitLoadStorePostIndex(instr);
}
break;
}
case 2: {
// TODO: VisitLoadStoreRegisterOffsetUnpriv.
VisitUnimplemented(instr);
break;
}
case 3: {
if (instr->Mask(0xC4C00000) == 0xC0800000) {
VisitUnallocated(instr);
} else {
VisitLoadStorePreIndex(instr);
}
break;
}
}
} else {
if (instr->Bits(11, 10) == 0x2) {
if (instr->Bit(14) == 0) {
VisitUnallocated(instr);
} else {
VisitLoadStoreRegisterOffset(instr);
}
} else {
VisitUnallocated(instr);
}
}
}
}
}
} else {
if (instr->Bit(28) == 0) {
if (instr->Bit(29) == 0) {
VisitUnallocated(instr);
} else {
if ((instr->Bits(31, 30) == 0x3) ||
(instr->Mask(0xC4400000) == 0x40000000)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(23) == 0) {
VisitLoadStorePairOffset(instr);
} else {
VisitLoadStorePairPreIndex(instr);
}
}
}
} else {
if (instr->Bit(29) == 0) {
VisitUnallocated(instr);
} else {
if ((instr->Mask(0x84C00000) == 0x80C00000) ||
(instr->Mask(0x44800000) == 0x44800000) ||
(instr->Mask(0x84800000) == 0x84800000)) {
VisitUnallocated(instr);
} else {
VisitLoadStoreUnsignedOffset(instr);
}
}
}
}
}
void Decoder::DecodeLogical(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x2);
if (instr->Mask(0x80400000) == 0x00400000) {
VisitUnallocated(instr);
} else {
if (instr->Bit(23) == 0) {
VisitLogicalImmediate(instr);
} else {
if (instr->Bits(30, 29) == 0x1) {
VisitUnallocated(instr);
} else {
VisitMoveWideImmediate(instr);
}
}
}
}
void Decoder::DecodeBitfieldExtract(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x3);
if ((instr->Mask(0x80400000) == 0x80000000) ||
(instr->Mask(0x80400000) == 0x00400000) ||
(instr->Mask(0x80008000) == 0x00008000)) {
VisitUnallocated(instr);
} else if (instr->Bit(23) == 0) {
if ((instr->Mask(0x80200000) == 0x00200000) ||
(instr->Mask(0x60000000) == 0x60000000)) {
VisitUnallocated(instr);
} else {
VisitBitfield(instr);
}
} else {
if ((instr->Mask(0x60200000) == 0x00200000) ||
(instr->Mask(0x60000000) != 0x00000000)) {
VisitUnallocated(instr);
} else {
VisitExtract(instr);
}
}
}
void Decoder::DecodeAddSubImmediate(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x1);
if (instr->Bit(23) == 1) {
VisitUnallocated(instr);
} else {
VisitAddSubImmediate(instr);
}
}
void Decoder::DecodeDataProcessing(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0xA) ||
(instr->Bits(27, 24) == 0xB));
if (instr->Bit(24) == 0) {
if (instr->Bit(28) == 0) {
if (instr->Mask(0x80008000) == 0x00008000) {
VisitUnallocated(instr);
} else {
VisitLogicalShifted(instr);
}
} else {
switch (instr->Bits(23, 21)) {
case 0: {
if (instr->Mask(0x0000FC00) != 0) {
VisitUnallocated(instr);
} else {
VisitAddSubWithCarry(instr);
}
break;
}
case 2: {
if ((instr->Bit(29) == 0) ||
(instr->Mask(0x00000410) != 0)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(11) == 0) {
VisitConditionalCompareRegister(instr);
} else {
VisitConditionalCompareImmediate(instr);
}
}
break;
}
case 4: {
if (instr->Mask(0x20000800) != 0x00000000) {
VisitUnallocated(instr);
} else {
VisitConditionalSelect(instr);
}
break;
}
case 6: {
if (instr->Bit(29) == 0x1) {
VisitUnallocated(instr);
} else {
if (instr->Bit(30) == 0) {
if ((instr->Bit(15) == 0x1) ||
(instr->Bits(15, 11) == 0) ||
(instr->Bits(15, 12) == 0x1) ||
(instr->Bits(15, 12) == 0x3) ||
(instr->Bits(15, 13) == 0x3) ||
(instr->Mask(0x8000EC00) == 0x00004C00) ||
(instr->Mask(0x8000E800) == 0x80004000) ||
(instr->Mask(0x8000E400) == 0x80004000)) {
VisitUnallocated(instr);
} else {
VisitDataProcessing2Source(instr);
}
} else {
if ((instr->Bit(13) == 1) ||
(instr->Bits(20, 16) != 0) ||
(instr->Bits(15, 14) != 0) ||
(instr->Mask(0xA01FFC00) == 0x00000C00) ||
(instr->Mask(0x201FF800) == 0x00001800)) {
VisitUnallocated(instr);
} else {
VisitDataProcessing1Source(instr);
}
}
break;
}
}
case 1:
case 3:
case 5:
case 7: VisitUnallocated(instr); break;
}
}
} else {
if (instr->Bit(28) == 0) {
if (instr->Bit(21) == 0) {
if ((instr->Bits(23, 22) == 0x3) ||
(instr->Mask(0x80008000) == 0x00008000)) {
VisitUnallocated(instr);
} else {
VisitAddSubShifted(instr);
}
} else {
if ((instr->Mask(0x00C00000) != 0x00000000) ||
(instr->Mask(0x00001400) == 0x00001400) ||
(instr->Mask(0x00001800) == 0x00001800)) {
VisitUnallocated(instr);
} else {
VisitAddSubExtended(instr);
}
}
} else {
if ((instr->Bit(30) == 0x1) ||
(instr->Bits(30, 29) == 0x1) ||
(instr->Mask(0xE0600000) == 0x00200000) ||
(instr->Mask(0xE0608000) == 0x00400000) ||
(instr->Mask(0x60608000) == 0x00408000) ||
(instr->Mask(0x60E00000) == 0x00E00000) ||
(instr->Mask(0x60E00000) == 0x00800000) ||
(instr->Mask(0x60E00000) == 0x00600000)) {
VisitUnallocated(instr);
} else {
VisitDataProcessing3Source(instr);
}
}
}
}
void Decoder::DecodeFP(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0xE) ||
(instr->Bits(27, 24) == 0xF));
if (instr->Bit(28) == 0) {
DecodeAdvSIMDDataProcessing(instr);
} else {
if (instr->Bit(29) == 1) {
VisitUnallocated(instr);
} else {
if (instr->Bits(31, 30) == 0x3) {
VisitUnallocated(instr);
} else if (instr->Bits(31, 30) == 0x1) {
DecodeAdvSIMDDataProcessing(instr);
} else {
if (instr->Bit(24) == 0) {
if (instr->Bit(21) == 0) {
if ((instr->Bit(23) == 1) ||
(instr->Bit(18) == 1) ||
(instr->Mask(0x80008000) == 0x00000000) ||
(instr->Mask(0x000E0000) == 0x00000000) ||
(instr->Mask(0x000E0000) == 0x000A0000) ||
(instr->Mask(0x00160000) == 0x00000000) ||
(instr->Mask(0x00160000) == 0x00120000)) {
VisitUnallocated(instr);
} else {
VisitFPFixedPointConvert(instr);
}
} else {
if (instr->Bits(15, 10) == 32) {
VisitUnallocated(instr);
} else if (instr->Bits(15, 10) == 0) {
if ((instr->Bits(23, 22) == 0x3) ||
(instr->Mask(0x000E0000) == 0x000A0000) ||
(instr->Mask(0x000E0000) == 0x000C0000) ||
(instr->Mask(0x00160000) == 0x00120000) ||
(instr->Mask(0x00160000) == 0x00140000) ||
(instr->Mask(0x20C40000) == 0x00800000) ||
(instr->Mask(0x20C60000) == 0x00840000) ||
(instr->Mask(0xA0C60000) == 0x80060000) ||
(instr->Mask(0xA0C60000) == 0x00860000) ||
(instr->Mask(0xA0C60000) == 0x00460000) ||
(instr->Mask(0xA0CE0000) == 0x80860000) ||
(instr->Mask(0xA0CE0000) == 0x804E0000) ||
(instr->Mask(0xA0CE0000) == 0x000E0000) ||
(instr->Mask(0xA0D60000) == 0x00160000) ||
(instr->Mask(0xA0D60000) == 0x80560000) ||
(instr->Mask(0xA0D60000) == 0x80960000)) {
VisitUnallocated(instr);
} else {
VisitFPIntegerConvert(instr);
}
} else if (instr->Bits(14, 10) == 16) {
const Instr masked_A0DF8000 = instr->Mask(0xA0DF8000);
if ((instr->Mask(0x80180000) != 0) ||
(masked_A0DF8000 == 0x00020000) ||
(masked_A0DF8000 == 0x00030000) ||
(masked_A0DF8000 == 0x00068000) ||
(masked_A0DF8000 == 0x00428000) ||
(masked_A0DF8000 == 0x00430000) ||
(masked_A0DF8000 == 0x00468000) ||
(instr->Mask(0xA0D80000) == 0x00800000) ||
(instr->Mask(0xA0DE0000) == 0x00C00000) ||
(instr->Mask(0xA0DF0000) == 0x00C30000) ||
(instr->Mask(0xA0DC0000) == 0x00C40000)) {
VisitUnallocated(instr);
} else {
VisitFPDataProcessing1Source(instr);
}
} else if (instr->Bits(13, 10) == 8) {
if ((instr->Bits(15, 14) != 0) ||
(instr->Bits(2, 0) != 0) ||
(instr->Mask(0x80800000) != 0x00000000)) {
VisitUnallocated(instr);
} else {
VisitFPCompare(instr);
}
} else if (instr->Bits(12, 10) == 4) {
if ((instr->Bits(9, 5) != 0) ||
(instr->Mask(0x80800000) != 0x00000000)) {
VisitUnallocated(instr);
} else {
VisitFPImmediate(instr);
}
} else {
if (instr->Mask(0x80800000) != 0x00000000) {
VisitUnallocated(instr);
} else {
switch (instr->Bits(11, 10)) {
case 1: {
VisitFPConditionalCompare(instr);
break;
}
case 2: {
if ((instr->Bits(15, 14) == 0x3) ||
(instr->Mask(0x00009000) == 0x00009000) ||
(instr->Mask(0x0000A000) == 0x0000A000)) {
VisitUnallocated(instr);
} else {
VisitFPDataProcessing2Source(instr);
}
break;
}
case 3: {
VisitFPConditionalSelect(instr);
break;
}
default: VIXL_UNREACHABLE();
}
}
}
}
} else {
// Bit 30 == 1 has been handled earlier.
VIXL_ASSERT(instr->Bit(30) == 0);
if (instr->Mask(0xA0800000) != 0) {
VisitUnallocated(instr);
} else {
VisitFPDataProcessing3Source(instr);
}
}
}
}
}
}
void Decoder::DecodeAdvSIMDLoadStore(const Instruction* instr) {
// TODO: Implement Advanced SIMD load/store instruction decode.
VIXL_ASSERT(instr->Bits(29, 25) == 0x6);
VisitUnimplemented(instr);
}
void Decoder::DecodeAdvSIMDDataProcessing(const Instruction* instr) {
// TODO: Implement Advanced SIMD data processing instruction decode.
VIXL_ASSERT(instr->Bits(27, 25) == 0x7);
VisitUnimplemented(instr);
}
#define DEFINE_VISITOR_CALLERS(A) \
void Decoder::Visit##A(const Instruction *instr) { \
VIXL_ASSERT(instr->Mask(A##FMask) == A##Fixed); \
std::list<DecoderVisitor*>::iterator it; \
for (it = visitors_.begin(); it != visitors_.end(); it++) { \
(*it)->Visit##A(instr); \
} \
}
VISITOR_LIST(DEFINE_VISITOR_CALLERS)
#undef DEFINE_VISITOR_CALLERS
} // namespace vixl
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