mirror of https://github.com/golang/go.git
170 lines
3.5 KiB
Go
170 lines
3.5 KiB
Go
// Derived from Inferno utils/6c/reg.c
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// http://code.google.com/p/inferno-os/source/browse/utils/6c/reg.c
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
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// Portions Copyright © 1997-1999 Vita Nuova Limited
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// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
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// Portions Copyright © 2004,2006 Bruce Ellis
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// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
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// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
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// Portions Copyright © 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package arm64
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import (
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"cmd/compile/internal/gc"
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"cmd/internal/obj/arm64"
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)
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const (
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NREGVAR = 64 /* 32 general + 32 floating */
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)
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var regname = []string{
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".R0",
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".R1",
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".R2",
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".R3",
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".R4",
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".R5",
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".R6",
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".R7",
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".R8",
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".R9",
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".R10",
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".R11",
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".R12",
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".R13",
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".R14",
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".R15",
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".R16",
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".R17",
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".R18",
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".R19",
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".R20",
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".R21",
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".R22",
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".R23",
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".R24",
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".R25",
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".R26",
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".R27",
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".R28",
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".R29",
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".R30",
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".R31",
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".F0",
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".F1",
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".F2",
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".F3",
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".F4",
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".F5",
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".F6",
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".F7",
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".F8",
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".F9",
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".F10",
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".F11",
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".F12",
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".F13",
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".F14",
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".F15",
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".F16",
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".F17",
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".F18",
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".F19",
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".F20",
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".F21",
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".F22",
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".F23",
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".F24",
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".F25",
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".F26",
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".F27",
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".F28",
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".F29",
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".F30",
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".F31",
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}
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func regnames(n *int) []string {
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*n = NREGVAR
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return regname
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}
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func excludedregs() uint64 {
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// Exclude registers with fixed functions
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regbits := uint64(RtoB(arm64.REGRT1) | RtoB(arm64.REGRT2) | RtoB(arm64.REGPR))
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// Exclude R26 - R31.
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for r := arm64.REGMAX + 1; r <= arm64.REGZERO; r++ {
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regbits |= RtoB(r)
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}
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// Also exclude floating point registers with fixed constants
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regbits |= RtoB(arm64.REG_F27) | RtoB(arm64.REG_F28) | RtoB(arm64.REG_F29) | RtoB(arm64.REG_F30) | RtoB(arm64.REG_F31)
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return regbits
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}
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func doregbits(r int) uint64 {
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return 0
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}
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/*
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* track register variables including external registers:
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* bit reg
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* 0 R0
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* 1 R1
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* ... ...
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* 31 R31
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* 32+0 F0
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* 32+1 F1
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* ... ...
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* 32+31 F31
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*/
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func RtoB(r int) uint64 {
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if r >= arm64.REG_R0 && r <= arm64.REG_R31 {
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return 1 << uint(r-arm64.REG_R0)
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}
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if r >= arm64.REG_F0 && r <= arm64.REG_F31 {
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return 1 << uint(32+r-arm64.REG_F0)
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}
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return 0
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}
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func BtoR(b uint64) int {
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b &= 0xffffffff
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if b == 0 {
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return 0
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}
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return gc.Bitno(b) + arm64.REG_R0
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}
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func BtoF(b uint64) int {
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b >>= 32
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if b == 0 {
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return 0
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}
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return gc.Bitno(b) + arm64.REG_F0
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}
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