| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // This file encapsulates some of the odd characteristics of the ARM64 |
| // instruction set, to minimize its interaction with the core of the |
| // assembler. |
| |
| package arch |
| |
| import ( |
| "cmd/internal/obj" |
| "cmd/internal/obj/arm64" |
| "errors" |
| ) |
| |
| var arm64LS = map[string]uint8{ |
| "P": arm64.C_XPOST, |
| "W": arm64.C_XPRE, |
| } |
| |
| var arm64Jump = map[string]bool{ |
| "B": true, |
| "BL": true, |
| "BEQ": true, |
| "BNE": true, |
| "BCS": true, |
| "BHS": true, |
| "BCC": true, |
| "BLO": true, |
| "BMI": true, |
| "BPL": true, |
| "BVS": true, |
| "BVC": true, |
| "BHI": true, |
| "BLS": true, |
| "BGE": true, |
| "BLT": true, |
| "BGT": true, |
| "BLE": true, |
| "CALL": true, |
| "CBZ": true, |
| "CBZW": true, |
| "CBNZ": true, |
| "CBNZW": true, |
| "JMP": true, |
| "TBNZ": true, |
| "TBZ": true, |
| } |
| |
| func jumpArm64(word string) bool { |
| return arm64Jump[word] |
| } |
| |
| // IsARM64CMP reports whether the op (as defined by an arm.A* constant) is |
| // one of the comparison instructions that require special handling. |
| func IsARM64CMP(op obj.As) bool { |
| switch op { |
| case arm64.ACMN, arm64.ACMP, arm64.ATST, |
| arm64.ACMNW, arm64.ACMPW, arm64.ATSTW, |
| arm64.AFCMPS, arm64.AFCMPD, |
| arm64.AFCMPES, arm64.AFCMPED: |
| return true |
| } |
| return false |
| } |
| |
| // IsARM64STLXR reports whether the op (as defined by an arm64.A* |
| // constant) is one of the STLXR-like instructions that require special |
| // handling. |
| func IsARM64STLXR(op obj.As) bool { |
| switch op { |
| case arm64.ASTLXRB, arm64.ASTLXRH, arm64.ASTLXRW, arm64.ASTLXR, |
| arm64.ASTXRB, arm64.ASTXRH, arm64.ASTXRW, arm64.ASTXR: |
| return true |
| } |
| return false |
| } |
| |
| // ARM64Suffix handles the special suffix for the ARM64. |
| // It returns a boolean to indicate success; failure means |
| // cond was unrecognized. |
| func ARM64Suffix(prog *obj.Prog, cond string) bool { |
| if cond == "" { |
| return true |
| } |
| bits, ok := ParseARM64Suffix(cond) |
| if !ok { |
| return false |
| } |
| prog.Scond = bits |
| return true |
| } |
| |
| // ParseARM64Suffix parses the suffix attached to an ARM64 instruction. |
| // The input is a single string consisting of period-separated condition |
| // codes, such as ".P.W". An initial period is ignored. |
| func ParseARM64Suffix(cond string) (uint8, bool) { |
| if cond == "" { |
| return 0, true |
| } |
| return parseARMCondition(cond, arm64LS, nil) |
| } |
| |
| func arm64RegisterNumber(name string, n int16) (int16, bool) { |
| switch name { |
| case "F": |
| if 0 <= n && n <= 31 { |
| return arm64.REG_F0 + n, true |
| } |
| case "R": |
| if 0 <= n && n <= 30 { // not 31 |
| return arm64.REG_R0 + n, true |
| } |
| case "V": |
| if 0 <= n && n <= 31 { |
| return arm64.REG_V0 + n, true |
| } |
| } |
| return 0, false |
| } |
| |
| // ARM64RegisterExtension parses an ARM64 register with extension or arrangment. |
| func ARM64RegisterExtension(a *obj.Addr, ext string, reg, num int16, isAmount, isIndex bool) error { |
| rm := uint32(reg) |
| if isAmount { |
| if num < 0 || num > 7 { |
| return errors.New("shift amount out of range") |
| } |
| } |
| switch ext { |
| case "UXTB": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_UXTB + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (uint32(num) << 10)) |
| case "UXTH": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_UXTH + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (1 << 13) | (uint32(num) << 10)) |
| case "UXTW": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_UXTW + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (2 << 13) | (uint32(num) << 10)) |
| case "UXTX": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_UXTX + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (3 << 13) | (uint32(num) << 10)) |
| case "SXTB": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_SXTB + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (4 << 13) | (uint32(num) << 10)) |
| case "SXTH": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_SXTH + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (5 << 13) | (uint32(num) << 10)) |
| case "SXTW": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_SXTW + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (6 << 13) | (uint32(num) << 10)) |
| case "SXTX": |
| if !isAmount { |
| return errors.New("invalid register extension") |
| } |
| a.Reg = arm64.REG_SXTX + (reg & 31) + int16(num<<5) |
| a.Offset = int64(((rm & 31) << 16) | (7 << 13) | (uint32(num) << 10)) |
| case "B8": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_8B & 15) << 5) |
| case "B16": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_16B & 15) << 5) |
| case "H4": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_4H & 15) << 5) |
| case "H8": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_8H & 15) << 5) |
| case "S2": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_2S & 15) << 5) |
| case "S4": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_4S & 15) << 5) |
| case "D2": |
| a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_2D & 15) << 5) |
| case "B": |
| if !isIndex { |
| return nil |
| } |
| a.Reg = arm64.REG_ELEM + (reg & 31) + ((arm64.ARNG_B & 15) << 5) |
| a.Index = num |
| case "H": |
| if !isIndex { |
| return nil |
| } |
| a.Reg = arm64.REG_ELEM + (reg & 31) + ((arm64.ARNG_H & 15) << 5) |
| a.Index = num |
| case "S": |
| if !isIndex { |
| return nil |
| } |
| a.Reg = arm64.REG_ELEM + (reg & 31) + ((arm64.ARNG_S & 15) << 5) |
| a.Index = num |
| case "D": |
| if !isIndex { |
| return nil |
| } |
| a.Reg = arm64.REG_ELEM + (reg & 31) + ((arm64.ARNG_D & 15) << 5) |
| a.Index = num |
| default: |
| return errors.New("unsupported register extension type: " + ext) |
| } |
| a.Type = obj.TYPE_REG |
| return nil |
| } |
| |
| // ARM64RegisterArrangement parses an ARM64 vector register arrangment. |
| func ARM64RegisterArrangement(reg int16, name, arng string) (int64, error) { |
| var curQ, curSize uint16 |
| if name[0] != 'V' { |
| return 0, errors.New("expect V0 through V31; found: " + name) |
| } |
| if reg < 0 { |
| return 0, errors.New("invalid register number: " + name) |
| } |
| switch arng { |
| case "B8": |
| curSize = 0 |
| curQ = 0 |
| case "B16": |
| curSize = 0 |
| curQ = 1 |
| case "H4": |
| curSize = 1 |
| curQ = 0 |
| case "H8": |
| curSize = 1 |
| curQ = 1 |
| case "S2": |
| curSize = 1 |
| curQ = 0 |
| case "S4": |
| curSize = 2 |
| curQ = 1 |
| case "D1": |
| curSize = 3 |
| curQ = 0 |
| case "D2": |
| curSize = 3 |
| curQ = 1 |
| default: |
| return 0, errors.New("invalid arrangement in ARM64 register list") |
| } |
| return (int64(curQ) & 1 << 30) | (int64(curSize&3) << 10), nil |
| } |
| |
| // ARM64RegisterListOffset generates offset encoding according to AArch64 specification. |
| func ARM64RegisterListOffset(firstReg, regCnt int, arrangement int64) (int64, error) { |
| offset := int64(firstReg) |
| switch regCnt { |
| case 1: |
| offset |= 0x7 << 12 |
| case 2: |
| offset |= 0xa << 12 |
| case 3: |
| offset |= 0x6 << 12 |
| case 4: |
| offset |= 0x2 << 12 |
| default: |
| return 0, errors.New("invalid register numbers in ARM64 register list") |
| } |
| offset |= arrangement |
| // arm64 uses the 60th bit to differentiate from other archs |
| // For more details, refer to: obj/arm64/list7.go |
| offset |= 1 << 60 |
| return offset, nil |
| } |
