| // 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/x86" |
| import "cmd/internal/gc" |
| |
| const ( |
| NREGVAR = 16 /* 8 integer + 8 floating */ |
| ) |
| |
| var reg [x86.MAXREG]uint8 |
| |
| 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(x86.REG_SP) |
| } |
| |
| func doregbits(r int) uint64 { |
| b := uint64(0) |
| if r >= x86.REG_AX && r <= x86.REG_DI { |
| b |= RtoB(r) |
| } else if r >= x86.REG_AL && r <= x86.REG_BL { |
| b |= RtoB(r - x86.REG_AL + x86.REG_AX) |
| } else if r >= x86.REG_AH && r <= x86.REG_BH { |
| b |= RtoB(r - x86.REG_AH + x86.REG_AX) |
| } else if r >= x86.REG_X0 && r <= x86.REG_X0+7 { |
| b |= FtoB(r) |
| } |
| return b |
| } |
| |
| func RtoB(r int) uint64 { |
| if r < x86.REG_AX || r > x86.REG_DI { |
| return 0 |
| } |
| return 1 << uint(r-x86.REG_AX) |
| } |
| |
| func BtoR(b uint64) int { |
| b &= 0xff |
| if b == 0 { |
| return 0 |
| } |
| return gc.Bitno(b) + x86.REG_AX |
| } |
| |
| func FtoB(f int) uint64 { |
| if f < x86.REG_X0 || f > x86.REG_X7 { |
| return 0 |
| } |
| return 1 << uint(f-x86.REG_X0+8) |
| } |
| |
| func BtoF(b uint64) int { |
| b &= 0xFF00 |
| if b == 0 { |
| return 0 |
| } |
| return gc.Bitno(b) - 8 + x86.REG_X0 |
| } |
