1// Inferno utils/5l/obj.c
2// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/5l/obj.c
3//
4//	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
5//	Portions Copyright © 1995-1997 C H Forsyth ([email protected])
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 ([email protected])
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
31package arm
32
33import (
34	"cmd/internal/objabi"
35	"cmd/internal/sys"
36	"cmd/link/internal/ld"
37)
38
39func Init() (*sys.Arch, ld.Arch) {
40	arch := sys.ArchARM
41
42	theArch := ld.Arch{
43		Funcalign:  funcAlign,
44		Maxalign:   maxAlign,
45		Minalign:   minAlign,
46		Dwarfregsp: dwarfRegSP,
47		Dwarfreglr: dwarfRegLR,
48		TrampLimit: 0x1c00000, // 24-bit signed offset * 4, leave room for PLT etc.
49
50		Plan9Magic: 0x647,
51
52		Adddynrel:        adddynrel,
53		Archinit:         archinit,
54		Archreloc:        archreloc,
55		Archrelocvariant: archrelocvariant,
56		Extreloc:         extreloc,
57		Trampoline:       trampoline,
58		Gentext:          gentext,
59		Machoreloc1:      machoreloc1,
60		PEreloc1:         pereloc1,
61
62		ELF: ld.ELFArch{
63			Linuxdynld:     "/lib/ld-linux.so.3", // 2 for OABI, 3 for EABI
64			LinuxdynldMusl: "/lib/ld-musl-arm.so.1",
65			Freebsddynld:   "/usr/libexec/ld-elf.so.1",
66			Openbsddynld:   "/usr/libexec/ld.so",
67			Netbsddynld:    "/libexec/ld.elf_so",
68			Dragonflydynld: "XXX",
69			Solarisdynld:   "XXX",
70
71			Reloc1:    elfreloc1,
72			RelocSize: 8,
73			SetupPLT:  elfsetupplt,
74		},
75	}
76
77	return arch, theArch
78}
79
80func archinit(ctxt *ld.Link) {
81	switch ctxt.HeadType {
82	default:
83		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
84
85	case objabi.Hplan9: /* plan 9 */
86		ld.HEADR = 32
87		if *ld.FlagRound == -1 {
88			*ld.FlagRound = 4096
89		}
90		if *ld.FlagTextAddr == -1 {
91			*ld.FlagTextAddr = ld.Rnd(4096, *ld.FlagRound) + int64(ld.HEADR)
92		}
93
94	case objabi.Hlinux, /* arm elf */
95		objabi.Hfreebsd,
96		objabi.Hnetbsd,
97		objabi.Hopenbsd:
98		*ld.FlagD = false
99		// with dynamic linking
100		ld.Elfinit(ctxt)
101		ld.HEADR = ld.ELFRESERVE
102		if *ld.FlagRound == -1 {
103			*ld.FlagRound = 0x10000
104		}
105		if *ld.FlagTextAddr == -1 {
106			*ld.FlagTextAddr = ld.Rnd(0x10000, *ld.FlagRound) + int64(ld.HEADR)
107		}
108
109	case objabi.Hwindows: /* PE executable */
110		// ld.HEADR, ld.FlagTextAddr, ld.FlagRound are set in ld.Peinit
111		return
112	}
113}
114