obj.go

Documentation: cmd/link/internal/x86

     1  // Inferno utils/8l/obj.c
     2  // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/8l/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 x86
    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.Arch386
    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*11*11 + 7),
    52  
    53  		Adddynrel:        adddynrel,
    54  		Archinit:         archinit,
    55  		Archreloc:        archreloc,
    56  		Archrelocvariant: archrelocvariant,
    57  		Elfreloc1:        elfreloc1,
    58  		ElfrelocSize:     8,
    59  		Elfsetupplt:      elfsetupplt,
    60  		Gentext:          gentext,
    61  		Machoreloc1:      machoreloc1,
    62  		PEreloc1:         pereloc1,
    63  
    64  		Linuxdynld:   "/lib/ld-linux.so.2",
    65  		Freebsddynld: "/usr/libexec/ld-elf.so.1",
    66  		Openbsddynld: "/usr/libexec/ld.so",
    67  		Netbsddynld:  "/usr/libexec/ld.elf_so",
    68  		Solarisdynld: "/lib/ld.so.1",
    69  	}
    70  
    71  	return arch, theArch
    72  }
    73  
    74  func archinit(ctxt *ld.Link) {
    75  	switch ctxt.HeadType {
    76  	default:
    77  		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
    78  
    79  	case objabi.Hplan9: /* plan 9 */
    80  		ld.HEADR = 32
    81  
    82  		if *ld.FlagTextAddr == -1 {
    83  			*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
    84  		}
    85  		if *ld.FlagRound == -1 {
    86  			*ld.FlagRound = 4096
    87  		}
    88  
    89  	case objabi.Hdarwin: /* apple MACH */
    90  		ld.HEADR = ld.INITIAL_MACHO_HEADR
    91  		if *ld.FlagTextAddr == -1 {
    92  			*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
    93  		}
    94  		if *ld.FlagRound == -1 {
    95  			*ld.FlagRound = 4096
    96  		}
    97  
    98  	case objabi.Hlinux, /* elf32 executable */
    99  		objabi.Hfreebsd,
   100  		objabi.Hnetbsd,
   101  		objabi.Hopenbsd:
   102  		ld.Elfinit(ctxt)
   103  
   104  		ld.HEADR = ld.ELFRESERVE
   105  		if *ld.FlagTextAddr == -1 {
   106  			*ld.FlagTextAddr = 0x08048000 + int64(ld.HEADR)
   107  		}
   108  		if *ld.FlagRound == -1 {
   109  			*ld.FlagRound = 4096
   110  		}
   111  
   112  	case objabi.Hwindows: /* PE executable */
   113  		// ld.HEADR, ld.FlagTextAddr, ld.FlagRound are set in ld.Peinit
   114  		return
   115  	}
   116  }
   117
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