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// Derived from Inferno utils/6c/reg.c
// http://code.google.com/p/inferno-os/source/browse/utils/6c/reg.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import "cmd/internal/obj/i386"
import "cmd/internal/gc"
const (
NREGVAR = 16
)
var regname = []string{
".ax",
".cx",
".dx",
".bx",
".sp",
".bp",
".si",
".di",
".x0",
".x1",
".x2",
".x3",
".x4",
".x5",
".x6",
".x7",
}
func regnames(n *int) []string {
*n = NREGVAR
return regname
}
func excludedregs() uint64 {
return RtoB(i386.REG_SP)
}
func doregbits(r int) uint64 {
var b uint64
b = 0
if r >= i386.REG_AX && r <= i386.REG_DI {
b |= RtoB(r)
} else if r >= i386.REG_AL && r <= i386.REG_BL {
b |= RtoB(r - i386.REG_AL + i386.REG_AX)
} else if r >= i386.REG_AH && r <= i386.REG_BH {
b |= RtoB(r - i386.REG_AH + i386.REG_AX)
} else if r >= i386.REG_X0 && r <= i386.REG_X0+7 {
b |= FtoB(r)
}
return b
}
func RtoB(r int) uint64 {
if r < i386.REG_AX || r > i386.REG_DI {
return 0
}
return 1 << uint(r-i386.REG_AX)
}
func BtoR(b uint64) int {
b &= 0xff
if b == 0 {
return 0
}
return gc.Bitno(b) + i386.REG_AX
}
func FtoB(f int) uint64 {
if f < i386.REG_X0 || f > i386.REG_X7 {
return 0
}
return 1 << uint(f-i386.REG_X0+8)
}
func BtoF(b uint64) int {
b &= 0xFF00
if b == 0 {
return 0
}
return gc.Bitno(b) - 8 + i386.REG_X0
}
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