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// 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 ARM
// instruction set, to minimize its interaction with the core of the
// assembler.
package arch
import (
"strings"
"cmd/internal/obj"
"cmd/internal/obj/arm"
)
var armLS = map[string]uint8{
"U": arm.C_UBIT,
"S": arm.C_SBIT,
"W": arm.C_WBIT,
"P": arm.C_PBIT,
"PW": arm.C_WBIT | arm.C_PBIT,
"WP": arm.C_WBIT | arm.C_PBIT,
}
var armSCOND = map[string]uint8{
"EQ": arm.C_SCOND_EQ,
"NE": arm.C_SCOND_NE,
"CS": arm.C_SCOND_HS,
"HS": arm.C_SCOND_HS,
"CC": arm.C_SCOND_LO,
"LO": arm.C_SCOND_LO,
"MI": arm.C_SCOND_MI,
"PL": arm.C_SCOND_PL,
"VS": arm.C_SCOND_VS,
"VC": arm.C_SCOND_VC,
"HI": arm.C_SCOND_HI,
"LS": arm.C_SCOND_LS,
"GE": arm.C_SCOND_GE,
"LT": arm.C_SCOND_LT,
"GT": arm.C_SCOND_GT,
"LE": arm.C_SCOND_LE,
"AL": arm.C_SCOND_NONE,
"U": arm.C_UBIT,
"S": arm.C_SBIT,
"W": arm.C_WBIT,
"P": arm.C_PBIT,
"PW": arm.C_WBIT | arm.C_PBIT,
"WP": arm.C_WBIT | arm.C_PBIT,
"F": arm.C_FBIT,
"IBW": arm.C_WBIT | arm.C_PBIT | arm.C_UBIT,
"IAW": arm.C_WBIT | arm.C_UBIT,
"DBW": arm.C_WBIT | arm.C_PBIT,
"DAW": arm.C_WBIT,
"IB": arm.C_PBIT | arm.C_UBIT,
"IA": arm.C_UBIT,
"DB": arm.C_PBIT,
"DA": 0,
}
var armJump = map[string]bool{
"B": true,
"BL": true,
"BX": 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,
"JMP": true,
}
func jumpArm(word string) bool {
return armJump[word]
}
// IsARMCMP reports whether the op (as defined by an arm.A* constant) is
// one of the comparison instructions that require special handling.
func IsARMCMP(op obj.As) bool {
switch op {
case arm.ACMN, arm.ACMP, arm.ATEQ, arm.ATST:
return true
}
return false
}
// IsARMSTREX reports whether the op (as defined by an arm.A* constant) is
// one of the STREX-like instructions that require special handling.
func IsARMSTREX(op obj.As) bool {
switch op {
case arm.ASTREX, arm.ASTREXD, arm.ASWPW, arm.ASWPBU:
return true
}
return false
}
// MCR is not defined by the obj/arm; instead we define it privately here.
// It is encoded as an MRC with a bit inside the instruction word,
// passed to arch.ARMMRCOffset.
const aMCR = arm.ALAST + 1
// IsARMMRC reports whether the op (as defined by an arm.A* constant) is
// MRC or MCR.
func IsARMMRC(op obj.As) bool {
switch op {
case arm.AMRC, aMCR: // Note: aMCR is defined in this package.
return true
}
return false
}
// IsARMBFX reports whether the op (as defined by an arm.A* constant) is one the
// BFX-like instructions which are in the form of "op $width, $LSB, (Reg,) Reg".
func IsARMBFX(op obj.As) bool {
switch op {
case arm.ABFX, arm.ABFXU, arm.ABFC, arm.ABFI:
return true
}
return false
}
// IsARMFloatCmp reports whether the op is a floating comparison instruction.
func IsARMFloatCmp(op obj.As) bool {
switch op {
case arm.ACMPF, arm.ACMPD:
return true
}
return false
}
// ARMMRCOffset implements the peculiar encoding of the MRC and MCR instructions.
// The difference between MRC and MCR is represented by a bit high in the word, not
// in the usual way by the opcode itself. Asm must use AMRC for both instructions, so
// we return the opcode for MRC so that asm doesn't need to import obj/arm.
func ARMMRCOffset(op obj.As, cond string, x0, x1, x2, x3, x4, x5 int64) (offset int64, op0 obj.As, ok bool) {
op1 := int64(0)
if op == arm.AMRC {
op1 = 1
}
bits, ok := ParseARMCondition(cond)
if !ok {
return
}
offset = (0xe << 24) | // opcode
(op1 << 20) | // MCR/MRC
((int64(bits) ^ arm.C_SCOND_XOR) << 28) | // scond
((x0 & 15) << 8) | //coprocessor number
((x1 & 7) << 21) | // coprocessor operation
((x2 & 15) << 12) | // ARM register
((x3 & 15) << 16) | // Crn
((x4 & 15) << 0) | // Crm
((x5 & 7) << 5) | // coprocessor information
(1 << 4) /* must be set */
return offset, arm.AMRC, true
}
// IsARMMULA reports whether the op (as defined by an arm.A* constant) is
// MULA, MULS, MMULA, MMULS, MULABB, MULAWB or MULAWT, the 4-operand instructions.
func IsARMMULA(op obj.As) bool {
switch op {
case arm.AMULA, arm.AMULS, arm.AMMULA, arm.AMMULS, arm.AMULABB, arm.AMULAWB, arm.AMULAWT:
return true
}
return false
}
var bcode = []obj.As{
arm.ABEQ,
arm.ABNE,
arm.ABCS,
arm.ABCC,
arm.ABMI,
arm.ABPL,
arm.ABVS,
arm.ABVC,
arm.ABHI,
arm.ABLS,
arm.ABGE,
arm.ABLT,
arm.ABGT,
arm.ABLE,
arm.AB,
obj.ANOP,
}
// ARMConditionCodes handles the special condition code situation for the ARM.
// It returns a boolean to indicate success; failure means cond was unrecognized.
func ARMConditionCodes(prog *obj.Prog, cond string) bool {
if cond == "" {
return true
}
bits, ok := ParseARMCondition(cond)
if !ok {
return false
}
/* hack to make B.NE etc. work: turn it into the corresponding conditional */
if prog.As == arm.AB {
prog.As = bcode[(bits^arm.C_SCOND_XOR)&0xf]
bits = (bits &^ 0xf) | arm.C_SCOND_NONE
}
prog.Scond = bits
return true
}
// ParseARMCondition parses the conditions attached to an ARM instruction.
// The input is a single string consisting of period-separated condition
// codes, such as ".P.W". An initial period is ignored.
func ParseARMCondition(cond string) (uint8, bool) {
return parseARMCondition(cond, armLS, armSCOND)
}
func parseARMCondition(cond string, ls, scond map[string]uint8) (uint8, bool) {
cond = strings.TrimPrefix(cond, ".")
if cond == "" {
return arm.C_SCOND_NONE, true
}
names := strings.Split(cond, ".")
bits := uint8(0)
for _, name := range names {
if b, present := ls[name]; present {
bits |= b
continue
}
if b, present := scond[name]; present {
bits = (bits &^ arm.C_SCOND) | b
continue
}
return 0, false
}
return bits, true
}
func armRegisterNumber(name string, n int16) (int16, bool) {
if n < 0 || 15 < n {
return 0, false
}
switch name {
case "R":
return arm.REG_R0 + n, true
case "F":
return arm.REG_F0 + n, true
}
return 0, false
}