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[gostls13.git] / src / cmd / link / internal / arm / obj.go
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 arm
32
33 import (
34         "cmd/internal/obj"
35         "cmd/internal/sys"
36         "cmd/link/internal/ld"
37         "fmt"
38         "log"
39 )
40
41 // Reading object files.
42
43 func Main() {
44         linkarchinit()
45         ld.Ldmain()
46 }
47
48 func linkarchinit() {
49         ld.SysArch = sys.ArchARM
50
51         ld.Thearch.Funcalign = FuncAlign
52         ld.Thearch.Maxalign = MaxAlign
53         ld.Thearch.Minalign = MinAlign
54         ld.Thearch.Dwarfregsp = DWARFREGSP
55         ld.Thearch.Dwarfreglr = DWARFREGLR
56
57         ld.Thearch.Adddynrel = adddynrel
58         ld.Thearch.Archinit = archinit
59         ld.Thearch.Archreloc = archreloc
60         ld.Thearch.Archrelocvariant = archrelocvariant
61         ld.Thearch.Asmb = asmb
62         ld.Thearch.Elfreloc1 = elfreloc1
63         ld.Thearch.Elfsetupplt = elfsetupplt
64         ld.Thearch.Gentext = gentext
65         ld.Thearch.Machoreloc1 = machoreloc1
66         ld.Thearch.Lput = ld.Lputl
67         ld.Thearch.Wput = ld.Wputl
68         ld.Thearch.Vput = ld.Vputl
69         ld.Thearch.Append16 = ld.Append16l
70         ld.Thearch.Append32 = ld.Append32l
71         ld.Thearch.Append64 = ld.Append64l
72
73         ld.Thearch.Linuxdynld = "/lib/ld-linux.so.3" // 2 for OABI, 3 for EABI
74         ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1"
75         ld.Thearch.Openbsddynld = "/usr/libexec/ld.so"
76         ld.Thearch.Netbsddynld = "/libexec/ld.elf_so"
77         ld.Thearch.Dragonflydynld = "XXX"
78         ld.Thearch.Solarisdynld = "XXX"
79 }
80
81 func archinit() {
82         // getgoextlinkenabled is based on GO_EXTLINK_ENABLED when
83         // Go was built; see ../../make.bash.
84         if ld.Linkmode == ld.LinkAuto && obj.Getgoextlinkenabled() == "0" {
85                 ld.Linkmode = ld.LinkInternal
86         }
87
88         if ld.Buildmode == ld.BuildmodeCArchive || ld.Buildmode == ld.BuildmodeCShared || ld.DynlinkingGo() {
89                 ld.Linkmode = ld.LinkExternal
90         }
91
92         switch ld.HEADTYPE {
93         default:
94                 if ld.Linkmode == ld.LinkAuto {
95                         ld.Linkmode = ld.LinkInternal
96                 }
97                 if ld.Linkmode == ld.LinkExternal && obj.Getgoextlinkenabled() != "1" {
98                         log.Fatalf("cannot use -linkmode=external with -H %s", ld.Headstr(int(ld.HEADTYPE)))
99                 }
100
101         case obj.Hlinux,
102                 obj.Hfreebsd,
103                 obj.Hnacl,
104                 obj.Hdarwin:
105                 break
106         }
107
108         switch ld.HEADTYPE {
109         default:
110                 ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
111
112         case obj.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 obj.Hlinux, /* arm elf */
126                 obj.Hfreebsd,
127                 obj.Hnetbsd,
128                 obj.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 obj.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 obj.Hdarwin: /* apple MACH */
158                 ld.Debug['w'] = 1 // disable DWARF generation
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 }