github.com/rsc/tmp@v0.0.0-20240517235954-6deaab19748b/bootstrap/bootstrap6g/reg.go (about) 1 // Do not edit. Bootstrap copy of /Users/rsc/g/go/src/cmd/6g/reg.go 2 3 // Derived from Inferno utils/6c/reg.c 4 // http://code.google.com/p/inferno-os/source/browse/utils/6c/reg.c 5 // 6 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. 7 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) 8 // Portions Copyright © 1997-1999 Vita Nuova Limited 9 // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 10 // Portions Copyright © 2004,2006 Bruce Ellis 11 // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) 12 // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others 13 // Portions Copyright © 2009 The Go Authors. All rights reserved. 14 // 15 // Permission is hereby granted, free of charge, to any person obtaining a copy 16 // of this software and associated documentation files (the "Software"), to deal 17 // in the Software without restriction, including without limitation the rights 18 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 19 // copies of the Software, and to permit persons to whom the Software is 20 // furnished to do so, subject to the following conditions: 21 // 22 // The above copyright notice and this permission notice shall be included in 23 // all copies or substantial portions of the Software. 24 // 25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 26 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 27 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 28 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 29 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 30 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 31 // THE SOFTWARE. 32 33 package main 34 35 import ( 36 "rsc.io/tmp/bootstrap/internal/gc" 37 "rsc.io/tmp/bootstrap/internal/obj" 38 "rsc.io/tmp/bootstrap/internal/obj/x86" 39 ) 40 41 const ( 42 NREGVAR = 32 43 ) 44 45 var reg [x86.MAXREG]uint8 46 47 var regname = []string{ 48 ".AX", 49 ".CX", 50 ".DX", 51 ".BX", 52 ".SP", 53 ".BP", 54 ".SI", 55 ".DI", 56 ".R8", 57 ".R9", 58 ".R10", 59 ".R11", 60 ".R12", 61 ".R13", 62 ".R14", 63 ".R15", 64 ".X0", 65 ".X1", 66 ".X2", 67 ".X3", 68 ".X4", 69 ".X5", 70 ".X6", 71 ".X7", 72 ".X8", 73 ".X9", 74 ".X10", 75 ".X11", 76 ".X12", 77 ".X13", 78 ".X14", 79 ".X15", 80 } 81 82 func regnames(n *int) []string { 83 *n = NREGVAR 84 return regname 85 } 86 87 func excludedregs() uint64 { 88 return RtoB(x86.REG_SP) 89 } 90 91 func doregbits(r int) uint64 { 92 b := uint64(0) 93 if r >= x86.REG_AX && r <= x86.REG_R15 { 94 b |= RtoB(r) 95 } else if r >= x86.REG_AL && r <= x86.REG_R15B { 96 b |= RtoB(r - x86.REG_AL + x86.REG_AX) 97 } else if r >= x86.REG_AH && r <= x86.REG_BH { 98 b |= RtoB(r - x86.REG_AH + x86.REG_AX) 99 } else if r >= x86.REG_X0 && r <= x86.REG_X0+15 { 100 b |= FtoB(r) 101 } 102 return b 103 } 104 105 // For ProgInfo. 106 const ( 107 AX = 1 << (x86.REG_AX - x86.REG_AX) 108 BX = 1 << (x86.REG_BX - x86.REG_AX) 109 CX = 1 << (x86.REG_CX - x86.REG_AX) 110 DX = 1 << (x86.REG_DX - x86.REG_AX) 111 DI = 1 << (x86.REG_DI - x86.REG_AX) 112 SI = 1 << (x86.REG_SI - x86.REG_AX) 113 R15 = 1 << (x86.REG_R15 - x86.REG_AX) 114 ) 115 116 func RtoB(r int) uint64 { 117 if r < x86.REG_AX || r > x86.REG_R15 { 118 return 0 119 } 120 return 1 << uint(r-x86.REG_AX) 121 } 122 123 func BtoR(b uint64) int { 124 b &= 0xffff 125 if gc.Nacl { 126 b &^= (1<<(x86.REG_BP-x86.REG_AX) | 1<<(x86.REG_R15-x86.REG_AX)) 127 } else if obj.Framepointer_enabled != 0 { 128 // BP is part of the calling convention if framepointer_enabled. 129 b &^= (1 << (x86.REG_BP - x86.REG_AX)) 130 } 131 if b == 0 { 132 return 0 133 } 134 return gc.Bitno(b) + x86.REG_AX 135 } 136 137 /* 138 * bit reg 139 * 16 X0 140 * ... 141 * 31 X15 142 */ 143 func FtoB(f int) uint64 { 144 if f < x86.REG_X0 || f > x86.REG_X15 { 145 return 0 146 } 147 return 1 << uint(f-x86.REG_X0+16) 148 } 149 150 func BtoF(b uint64) int { 151 b &= 0xFFFF0000 152 if b == 0 { 153 return 0 154 } 155 return gc.Bitno(b) - 16 + x86.REG_X0 156 }