1 // Inferno utils/5c/reg.c 2 // http://code.google.com/p/inferno-os/source/browse/utils/5c/reg.c 3 // 4 // Copyright 1994-1999 Lucent Technologies Inc. All rights reserved. 5 // Portions Copyright 1995-1997 C H Forsyth (forsyth (a] terzarima.net) 6 // Portions Copyright 1997-1999 Vita Nuova Limited 7 // Portions Copyright 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 8 // Portions Copyright 2004,2006 Bruce Ellis 9 // Portions Copyright 2005-2007 C H Forsyth (forsyth (a] terzarima.net) 10 // Revisions Copyright 2000-2007 Lucent Technologies Inc. and others 11 // Portions Copyright 2009 The Go Authors. All rights reserved. 12 // 13 // Permission is hereby granted, free of charge, to any person obtaining a copy 14 // of this software and associated documentation files (the "Software"), to deal 15 // in the Software without restriction, including without limitation the rights 16 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 17 // copies of the Software, and to permit persons to whom the Software is 18 // furnished to do so, subject to the following conditions: 19 // 20 // The above copyright notice and this permission notice shall be included in 21 // all copies or substantial portions of the Software. 22 // 23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 24 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 25 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 26 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 27 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 28 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 29 // THE SOFTWARE. 30 31 package arm 32 33 import "cmd/internal/obj/arm" 34 import "cmd/compile/internal/gc" 35 36 const ( 37 NREGVAR = 32 38 ) 39 40 var regname = []string{ 41 ".R0", 42 ".R1", 43 ".R2", 44 ".R3", 45 ".R4", 46 ".R5", 47 ".R6", 48 ".R7", 49 ".R8", 50 ".R9", 51 ".R10", 52 ".R11", 53 ".R12", 54 ".R13", 55 ".R14", 56 ".R15", 57 ".F0", 58 ".F1", 59 ".F2", 60 ".F3", 61 ".F4", 62 ".F5", 63 ".F6", 64 ".F7", 65 ".F8", 66 ".F9", 67 ".F10", 68 ".F11", 69 ".F12", 70 ".F13", 71 ".F14", 72 ".F15", 73 } 74 75 func regnames(n *int) []string { 76 *n = NREGVAR 77 return regname 78 } 79 80 func excludedregs() uint64 { 81 return RtoB(arm.REGSP) | RtoB(arm.REGLINK) | RtoB(arm.REGPC) 82 } 83 84 func doregbits(r int) uint64 { 85 return 0 86 } 87 88 /* 89 * bit reg 90 * 0 R0 91 * 1 R1 92 * ... ... 93 * 10 R10 94 * 12 R12 95 * 96 * bit reg 97 * 18 F2 98 * 19 F3 99 * ... ... 100 * 31 F15 101 */ 102 func RtoB(r int) uint64 { 103 if arm.REG_R0 <= r && r <= arm.REG_R15 { 104 if r >= arm.REGTMP-2 && r != arm.REG_R12 { // excluded R9 and R10 for m and g, but not R12 105 return 0 106 } 107 return 1 << uint(r-arm.REG_R0) 108 } 109 110 if arm.REG_F0 <= r && r <= arm.REG_F15 { 111 if r < arm.REG_F2 || r > arm.REG_F0+arm.NFREG-1 { 112 return 0 113 } 114 return 1 << uint((r-arm.REG_F0)+16) 115 } 116 117 return 0 118 } 119 120 func BtoR(b uint64) int { 121 // TODO Allow R0 and R1, but be careful with a 0 return 122 // TODO Allow R9. Only R10 is reserved now (just g, not m). 123 b &= 0x11fc // excluded R9 and R10 for m and g, but not R12 124 if b == 0 { 125 return 0 126 } 127 return gc.Bitno(b) + arm.REG_R0 128 } 129 130 func BtoF(b uint64) int { 131 b &= 0xfffc0000 132 if b == 0 { 133 return 0 134 } 135 return gc.Bitno(b) - 16 + arm.REG_F0 136 } 137
