obj.go

     1  // Inferno utils/6l/obj.c
     2  // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/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 amd64
    32  
    33  import (
    34  	"cmd/internal/objabi"
    35  	"cmd/internal/sys"
    36  	"cmd/link/internal/ld"
    37  )
    38  
    39  func Init() (*sys.Arch, ld.Arch) {
    40  	arch := sys.ArchAMD64
    41  
    42  	theArch := ld.Arch{
    43  		Funcalign:  funcAlign,
    44  		Maxalign:   maxAlign,
    45  		Minalign:   minAlign,
    46  		Dwarfregsp: dwarfRegSP,
    47  		Dwarfreglr: dwarfRegLR,
    48  		// 0xCC is INT $3 - breakpoint instruction
    49  		CodePad: []byte{0xCC},
    50  
    51  		Plan9Magic:  uint32(4*26*26 + 7),
    52  		Plan9_64Bit: true,
    53  
    54  		Adddynrel:        adddynrel,
    55  		Archinit:         archinit,
    56  		Archreloc:        archreloc,
    57  		Archrelocvariant: archrelocvariant,
    58  		Gentext:          gentext,
    59  		Machoreloc1:      machoreloc1,
    60  		MachorelocSize:   8,
    61  		PEreloc1:         pereloc1,
    62  		TLSIEtoLE:        tlsIEtoLE,
    63  
    64  		ELF: ld.ELFArch{
    65  			Linuxdynld:     "/lib64/ld-linux-x86-64.so.2",
    66  			LinuxdynldMusl: "/lib/ld-musl-x86_64.so.1",
    67  			Freebsddynld:   "/libexec/ld-elf.so.1",
    68  			Openbsddynld:   "/usr/libexec/ld.so",
    69  			Netbsddynld:    "/libexec/ld.elf_so",
    70  			Dragonflydynld: "/usr/libexec/ld-elf.so.2",
    71  			Solarisdynld:   "/lib/amd64/ld.so.1",
    72  
    73  			Reloc1:    elfreloc1,
    74  			RelocSize: 24,
    75  			SetupPLT:  elfsetupplt,
    76  		},
    77  	}
    78  
    79  	return arch, theArch
    80  }
    81  
    82  func archinit(ctxt *ld.Link) {
    83  	switch ctxt.HeadType {
    84  	default:
    85  		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
    86  
    87  	case objabi.Hplan9: /* plan 9 */
    88  		ld.HEADR = 32 + 8
    89  		if *ld.FlagRound == -1 {
    90  			*ld.FlagRound = 0x200000
    91  		}
    92  		if *ld.FlagTextAddr == -1 {
    93  			*ld.FlagTextAddr = ld.Rnd(0x200000, *ld.FlagRound) + int64(ld.HEADR)
    94  		}
    95  
    96  	case objabi.Hdarwin: /* apple MACH */
    97  		ld.HEADR = ld.INITIAL_MACHO_HEADR
    98  		if *ld.FlagRound == -1 {
    99  			*ld.FlagRound = 4096
   100  		}
   101  		if *ld.FlagTextAddr == -1 {
   102  			*ld.FlagTextAddr = ld.Rnd(0x1000000, *ld.FlagRound) + int64(ld.HEADR)
   103  		}
   104  
   105  	case objabi.Hlinux, /* elf64 executable */
   106  		objabi.Hfreebsd,   /* freebsd */
   107  		objabi.Hnetbsd,    /* netbsd */
   108  		objabi.Hopenbsd,   /* openbsd */
   109  		objabi.Hdragonfly, /* dragonfly */
   110  		objabi.Hsolaris:   /* solaris */
   111  		ld.Elfinit(ctxt)
   112  
   113  		ld.HEADR = ld.ELFRESERVE
   114  		if *ld.FlagRound == -1 {
   115  			*ld.FlagRound = 4096
   116  		}
   117  		if *ld.FlagTextAddr == -1 {
   118  			*ld.FlagTextAddr = ld.Rnd(1<<22, *ld.FlagRound) + int64(ld.HEADR)
   119  		}
   120  
   121  	case objabi.Hwindows: /* PE executable */
   122  		// ld.HEADR, ld.FlagTextAddr, ld.FlagRound are set in ld.Peinit
   123  		return
   124  	}
   125  }
   126
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