github.com/rsc/go@v0.0.0-20150416155037-e040fd465409/src/cmd/5l/obj.go (about) 1 // Inferno utils/5l/obj.c 2 // http://code.google.com/p/inferno-os/source/browse/utils/5l/obj.c 3 // 4 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. 5 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@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@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 main 32 33 import ( 34 "cmd/internal/ld" 35 "cmd/internal/obj" 36 "fmt" 37 "log" 38 ) 39 40 // Reading object files. 41 42 func main() { 43 linkarchinit() 44 ld.Ldmain() 45 } 46 47 func linkarchinit() { 48 ld.Thestring = "arm" 49 ld.Thelinkarch = &ld.Linkarm 50 51 ld.Thearch.Thechar = thechar 52 ld.Thearch.Ptrsize = ld.Thelinkarch.Ptrsize 53 ld.Thearch.Intsize = ld.Thelinkarch.Ptrsize 54 ld.Thearch.Regsize = ld.Thelinkarch.Regsize 55 ld.Thearch.Funcalign = FuncAlign 56 ld.Thearch.Maxalign = MaxAlign 57 ld.Thearch.Minlc = MINLC 58 ld.Thearch.Dwarfregsp = DWARFREGSP 59 60 ld.Thearch.Adddynlib = adddynlib 61 ld.Thearch.Adddynrel = adddynrel 62 ld.Thearch.Adddynsym = adddynsym 63 ld.Thearch.Archinit = archinit 64 ld.Thearch.Archreloc = archreloc 65 ld.Thearch.Archrelocvariant = archrelocvariant 66 ld.Thearch.Asmb = asmb 67 ld.Thearch.Elfreloc1 = elfreloc1 68 ld.Thearch.Elfsetupplt = elfsetupplt 69 ld.Thearch.Gentext = gentext 70 ld.Thearch.Machoreloc1 = machoreloc1 71 ld.Thearch.Lput = ld.Lputl 72 ld.Thearch.Wput = ld.Wputl 73 ld.Thearch.Vput = ld.Vputl 74 75 ld.Thearch.Linuxdynld = "/lib/ld-linux.so.3" // 2 for OABI, 3 for EABI 76 ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1" 77 ld.Thearch.Openbsddynld = "/usr/libexec/ld.so" 78 ld.Thearch.Netbsddynld = "/libexec/ld.elf_so" 79 ld.Thearch.Dragonflydynld = "XXX" 80 ld.Thearch.Solarisdynld = "XXX" 81 } 82 83 func archinit() { 84 // getgoextlinkenabled is based on GO_EXTLINK_ENABLED when 85 // Go was built; see ../../make.bash. 86 if ld.Linkmode == ld.LinkAuto && obj.Getgoextlinkenabled() == "0" { 87 ld.Linkmode = ld.LinkInternal 88 } 89 90 switch ld.HEADTYPE { 91 default: 92 if ld.Linkmode == ld.LinkAuto { 93 ld.Linkmode = ld.LinkInternal 94 } 95 if ld.Linkmode == ld.LinkExternal && obj.Getgoextlinkenabled() != "1" { 96 log.Fatalf("cannot use -linkmode=external with -H %s", ld.Headstr(int(ld.HEADTYPE))) 97 } 98 99 case ld.Hlinux, 100 ld.Hfreebsd, 101 ld.Hnacl, 102 ld.Hdarwin: 103 break 104 } 105 106 switch ld.HEADTYPE { 107 default: 108 ld.Diag("unknown -H option") 109 ld.Errorexit() 110 fallthrough 111 112 case ld.Hplan9: /* plan 9 */ 113 ld.HEADR = 32 114 115 if ld.INITTEXT == -1 { 116 ld.INITTEXT = 4128 117 } 118 if ld.INITDAT == -1 { 119 ld.INITDAT = 0 120 } 121 if ld.INITRND == -1 { 122 ld.INITRND = 4096 123 } 124 125 case ld.Hlinux, /* arm elf */ 126 ld.Hfreebsd, 127 ld.Hnetbsd, 128 ld.Hopenbsd: 129 ld.Debug['d'] = 0 130 // with dynamic linking 131 ld.Elfinit() 132 ld.HEADR = ld.ELFRESERVE 133 if ld.INITTEXT == -1 { 134 ld.INITTEXT = 0x10000 + int64(ld.HEADR) 135 } 136 if ld.INITDAT == -1 { 137 ld.INITDAT = 0 138 } 139 if ld.INITRND == -1 { 140 ld.INITRND = 4096 141 } 142 143 case ld.Hnacl: 144 ld.Elfinit() 145 ld.HEADR = 0x10000 146 ld.Funcalign = 16 147 if ld.INITTEXT == -1 { 148 ld.INITTEXT = 0x20000 149 } 150 if ld.INITDAT == -1 { 151 ld.INITDAT = 0 152 } 153 if ld.INITRND == -1 { 154 ld.INITRND = 0x10000 155 } 156 157 case ld.Hdarwin: /* apple MACH */ 158 ld.Debug['w'] = 1 // disable DWARF generataion 159 ld.Machoinit() 160 ld.HEADR = ld.INITIAL_MACHO_HEADR 161 if ld.INITTEXT == -1 { 162 ld.INITTEXT = 4096 + int64(ld.HEADR) 163 } 164 if ld.INITDAT == -1 { 165 ld.INITDAT = 0 166 } 167 if ld.INITRND == -1 { 168 ld.INITRND = 4096 169 } 170 } 171 172 if ld.INITDAT != 0 && ld.INITRND != 0 { 173 fmt.Printf("warning: -D0x%x is ignored because of -R0x%x\n", uint64(ld.INITDAT), uint32(ld.INITRND)) 174 } 175 176 // embed goarm to runtime.goarm 177 s := ld.Linklookup(ld.Ctxt, "runtime.goarm", 0) 178 179 s.Type = ld.SRODATA 180 ld.Adduint8(ld.Ctxt, s, uint8(ld.Ctxt.Goarm)) 181 }