+++ /dev/null
-// 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 "a64/instructions-a64.h"
-#include "a64/assembler-a64.h"
-
-namespace vixl {
-
-
-// Floating-point infinity values.
-const float kFP32PositiveInfinity = rawbits_to_float(0x7f800000);
-const float kFP32NegativeInfinity = rawbits_to_float(0xff800000);
-const double kFP64PositiveInfinity =
- rawbits_to_double(UINT64_C(0x7ff0000000000000));
-const double kFP64NegativeInfinity =
- rawbits_to_double(UINT64_C(0xfff0000000000000));
-
-
-// The default NaN values (for FPCR.DN=1).
-const double kFP64DefaultNaN = rawbits_to_double(UINT64_C(0x7ff8000000000000));
-const float kFP32DefaultNaN = rawbits_to_float(0x7fc00000);
-
-
-static uint64_t RotateRight(uint64_t value,
- unsigned int rotate,
- unsigned int width) {
- VIXL_ASSERT(width <= 64);
- rotate &= 63;
- return ((value & ((UINT64_C(1) << rotate) - 1)) <<
- (width - rotate)) | (value >> rotate);
-}
-
-
-static uint64_t RepeatBitsAcrossReg(unsigned reg_size,
- uint64_t value,
- unsigned width) {
- VIXL_ASSERT((width == 2) || (width == 4) || (width == 8) || (width == 16) ||
- (width == 32));
- VIXL_ASSERT((reg_size == kWRegSize) || (reg_size == kXRegSize));
- uint64_t result = value & ((UINT64_C(1) << width) - 1);
- for (unsigned i = width; i < reg_size; i *= 2) {
- result |= (result << i);
- }
- return result;
-}
-
-
-bool Instruction::IsLoad() const {
- if (Mask(LoadStoreAnyFMask) != LoadStoreAnyFixed) {
- return false;
- }
-
- if (Mask(LoadStorePairAnyFMask) == LoadStorePairAnyFixed) {
- return Mask(LoadStorePairLBit) != 0;
- } else {
- LoadStoreOp op = static_cast<LoadStoreOp>(Mask(LoadStoreOpMask));
- switch (op) {
- case LDRB_w:
- case LDRH_w:
- case LDR_w:
- case LDR_x:
- case LDRSB_w:
- case LDRSB_x:
- case LDRSH_w:
- case LDRSH_x:
- case LDRSW_x:
- case LDR_s:
- case LDR_d: return true;
- default: return false;
- }
- }
-}
-
-
-bool Instruction::IsStore() const {
- if (Mask(LoadStoreAnyFMask) != LoadStoreAnyFixed) {
- return false;
- }
-
- if (Mask(LoadStorePairAnyFMask) == LoadStorePairAnyFixed) {
- return Mask(LoadStorePairLBit) == 0;
- } else {
- LoadStoreOp op = static_cast<LoadStoreOp>(Mask(LoadStoreOpMask));
- switch (op) {
- case STRB_w:
- case STRH_w:
- case STR_w:
- case STR_x:
- case STR_s:
- case STR_d: return true;
- default: return false;
- }
- }
-}
-
-
-// Logical immediates can't encode zero, so a return value of zero is used to
-// indicate a failure case. Specifically, where the constraints on imm_s are
-// not met.
-uint64_t Instruction::ImmLogical() const {
- unsigned reg_size = SixtyFourBits() ? kXRegSize : kWRegSize;
- int64_t n = BitN();
- int64_t imm_s = ImmSetBits();
- int64_t imm_r = ImmRotate();
-
- // An integer is constructed from the n, imm_s and imm_r bits according to
- // the following table:
- //
- // N imms immr size S R
- // 1 ssssss rrrrrr 64 UInt(ssssss) UInt(rrrrrr)
- // 0 0sssss xrrrrr 32 UInt(sssss) UInt(rrrrr)
- // 0 10ssss xxrrrr 16 UInt(ssss) UInt(rrrr)
- // 0 110sss xxxrrr 8 UInt(sss) UInt(rrr)
- // 0 1110ss xxxxrr 4 UInt(ss) UInt(rr)
- // 0 11110s xxxxxr 2 UInt(s) UInt(r)
- // (s bits must not be all set)
- //
- // A pattern is constructed of size bits, where the least significant S+1
- // bits are set. The pattern is rotated right by R, and repeated across a
- // 32 or 64-bit value, depending on destination register width.
- //
-
- if (n == 1) {
- if (imm_s == 0x3F) {
- return 0;
- }
- uint64_t bits = (UINT64_C(1) << (imm_s + 1)) - 1;
- return RotateRight(bits, imm_r, 64);
- } else {
- if ((imm_s >> 1) == 0x1F) {
- return 0;
- }
- for (int width = 0x20; width >= 0x2; width >>= 1) {
- if ((imm_s & width) == 0) {
- int mask = width - 1;
- if ((imm_s & mask) == mask) {
- return 0;
- }
- uint64_t bits = (UINT64_C(1) << ((imm_s & mask) + 1)) - 1;
- return RepeatBitsAcrossReg(reg_size,
- RotateRight(bits, imm_r & mask, width),
- width);
- }
- }
- }
- VIXL_UNREACHABLE();
- return 0;
-}
-
-
-float Instruction::ImmFP32() const {
- // ImmFP: abcdefgh (8 bits)
- // Single: aBbb.bbbc.defg.h000.0000.0000.0000.0000 (32 bits)
- // where B is b ^ 1
- uint32_t bits = ImmFP();
- uint32_t bit7 = (bits >> 7) & 0x1;
- uint32_t bit6 = (bits >> 6) & 0x1;
- uint32_t bit5_to_0 = bits & 0x3f;
- uint32_t result = (bit7 << 31) | ((32 - bit6) << 25) | (bit5_to_0 << 19);
-
- return rawbits_to_float(result);
-}
-
-
-double Instruction::ImmFP64() const {
- // ImmFP: abcdefgh (8 bits)
- // Double: aBbb.bbbb.bbcd.efgh.0000.0000.0000.0000
- // 0000.0000.0000.0000.0000.0000.0000.0000 (64 bits)
- // where B is b ^ 1
- uint32_t bits = ImmFP();
- uint64_t bit7 = (bits >> 7) & 0x1;
- uint64_t bit6 = (bits >> 6) & 0x1;
- uint64_t bit5_to_0 = bits & 0x3f;
- uint64_t result = (bit7 << 63) | ((256 - bit6) << 54) | (bit5_to_0 << 48);
-
- return rawbits_to_double(result);
-}
-
-
-LSDataSize CalcLSPairDataSize(LoadStorePairOp op) {
- switch (op) {
- case STP_x:
- case LDP_x:
- case STP_d:
- case LDP_d: return LSDoubleWord;
- default: return LSWord;
- }
-}
-
-
-const Instruction* Instruction::ImmPCOffsetTarget() const {
- const Instruction * base = this;
- ptrdiff_t offset;
- if (IsPCRelAddressing()) {
- // ADR and ADRP.
- offset = ImmPCRel();
- if (Mask(PCRelAddressingMask) == ADRP) {
- base = AlignDown(base, kPageSize);
- offset *= kPageSize;
- } else {
- VIXL_ASSERT(Mask(PCRelAddressingMask) == ADR);
- }
- } else {
- // All PC-relative branches.
- VIXL_ASSERT(BranchType() != UnknownBranchType);
- // Relative branch offsets are instruction-size-aligned.
- offset = ImmBranch() << kInstructionSizeLog2;
- }
- return base + offset;
-}
-
-
-inline int Instruction::ImmBranch() const {
- switch (BranchType()) {
- case CondBranchType: return ImmCondBranch();
- case UncondBranchType: return ImmUncondBranch();
- case CompareBranchType: return ImmCmpBranch();
- case TestBranchType: return ImmTestBranch();
- default: VIXL_UNREACHABLE();
- }
- return 0;
-}
-
-
-void Instruction::SetImmPCOffsetTarget(const Instruction* target) {
- if (IsPCRelAddressing()) {
- SetPCRelImmTarget(target);
- } else {
- SetBranchImmTarget(target);
- }
-}
-
-
-void Instruction::SetPCRelImmTarget(const Instruction* target) {
- int32_t imm21;
- if ((Mask(PCRelAddressingMask) == ADR)) {
- imm21 = target - this;
- } else {
- VIXL_ASSERT(Mask(PCRelAddressingMask) == ADRP);
- uintptr_t this_page = reinterpret_cast<uintptr_t>(this) / kPageSize;
- uintptr_t target_page = reinterpret_cast<uintptr_t>(target) / kPageSize;
- imm21 = target_page - this_page;
- }
- Instr imm = Assembler::ImmPCRelAddress(imm21);
-
- SetInstructionBits(Mask(~ImmPCRel_mask) | imm);
-}
-
-
-void Instruction::SetBranchImmTarget(const Instruction* target) {
- VIXL_ASSERT(((target - this) & 3) == 0);
- Instr branch_imm = 0;
- uint32_t imm_mask = 0;
- int offset = (target - this) >> kInstructionSizeLog2;
- switch (BranchType()) {
- case CondBranchType: {
- branch_imm = Assembler::ImmCondBranch(offset);
- imm_mask = ImmCondBranch_mask;
- break;
- }
- case UncondBranchType: {
- branch_imm = Assembler::ImmUncondBranch(offset);
- imm_mask = ImmUncondBranch_mask;
- break;
- }
- case CompareBranchType: {
- branch_imm = Assembler::ImmCmpBranch(offset);
- imm_mask = ImmCmpBranch_mask;
- break;
- }
- case TestBranchType: {
- branch_imm = Assembler::ImmTestBranch(offset);
- imm_mask = ImmTestBranch_mask;
- break;
- }
- default: VIXL_UNREACHABLE();
- }
- SetInstructionBits(Mask(~imm_mask) | branch_imm);
-}
-
-
-void Instruction::SetImmLLiteral(const Instruction* source) {
- VIXL_ASSERT(IsWordAligned(source));
- ptrdiff_t offset = (source - this) >> kLiteralEntrySizeLog2;
- Instr imm = Assembler::ImmLLiteral(offset);
- Instr mask = ImmLLiteral_mask;
-
- SetInstructionBits(Mask(~mask) | imm);
-}
-} // namespace vixl
-
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