github.com/slayercat/go@v0.0.0-20170428012452-c51559813f61/src/cmd/link/internal/x86/obj.go (about)

     1  // Inferno utils/8l/obj.c
     2  // https://bitbucket.org/inferno-os/inferno-os/src/default/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  	"fmt"
    38  )
    39  
    40  func Init() {
    41  	ld.SysArch = sys.Arch386
    42  
    43  	ld.Thearch.Funcalign = funcAlign
    44  	ld.Thearch.Maxalign = maxAlign
    45  	ld.Thearch.Minalign = minAlign
    46  	ld.Thearch.Dwarfregsp = dwarfRegSP
    47  	ld.Thearch.Dwarfreglr = dwarfRegLR
    48  
    49  	ld.Thearch.Adddynrel = adddynrel
    50  	ld.Thearch.Archinit = archinit
    51  	ld.Thearch.Archreloc = archreloc
    52  	ld.Thearch.Archrelocvariant = archrelocvariant
    53  	ld.Thearch.Asmb = asmb
    54  	ld.Thearch.Elfreloc1 = elfreloc1
    55  	ld.Thearch.Elfsetupplt = elfsetupplt
    56  	ld.Thearch.Gentext = gentext
    57  	ld.Thearch.Machoreloc1 = machoreloc1
    58  	ld.Thearch.PEreloc1 = pereloc1
    59  	ld.Thearch.Lput = ld.Lputl
    60  	ld.Thearch.Wput = ld.Wputl
    61  	ld.Thearch.Vput = ld.Vputl
    62  	ld.Thearch.Append16 = ld.Append16l
    63  	ld.Thearch.Append32 = ld.Append32l
    64  	ld.Thearch.Append64 = ld.Append64l
    65  
    66  	ld.Thearch.Linuxdynld = "/lib/ld-linux.so.2"
    67  	ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1"
    68  	ld.Thearch.Openbsddynld = "/usr/libexec/ld.so"
    69  	ld.Thearch.Netbsddynld = "/usr/libexec/ld.elf_so"
    70  	ld.Thearch.Solarisdynld = "/lib/ld.so.1"
    71  }
    72  
    73  func archinit(ctxt *ld.Link) {
    74  	switch ld.Headtype {
    75  	default:
    76  		ld.Exitf("unknown -H option: %v", ld.Headtype)
    77  
    78  	case objabi.Hplan9: /* plan 9 */
    79  		ld.HEADR = 32
    80  
    81  		if *ld.FlagTextAddr == -1 {
    82  			*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
    83  		}
    84  		if *ld.FlagDataAddr == -1 {
    85  			*ld.FlagDataAddr = 0
    86  		}
    87  		if *ld.FlagRound == -1 {
    88  			*ld.FlagRound = 4096
    89  		}
    90  
    91  	case objabi.Hdarwin: /* apple MACH */
    92  		ld.Machoinit()
    93  
    94  		ld.HEADR = ld.INITIAL_MACHO_HEADR
    95  		if *ld.FlagTextAddr == -1 {
    96  			*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
    97  		}
    98  		if *ld.FlagDataAddr == -1 {
    99  			*ld.FlagDataAddr = 0
   100  		}
   101  		if *ld.FlagRound == -1 {
   102  			*ld.FlagRound = 4096
   103  		}
   104  
   105  	case objabi.Hlinux, /* elf32 executable */
   106  		objabi.Hfreebsd,
   107  		objabi.Hnetbsd,
   108  		objabi.Hopenbsd:
   109  		ld.Elfinit(ctxt)
   110  
   111  		ld.HEADR = ld.ELFRESERVE
   112  		if *ld.FlagTextAddr == -1 {
   113  			*ld.FlagTextAddr = 0x08048000 + int64(ld.HEADR)
   114  		}
   115  		if *ld.FlagDataAddr == -1 {
   116  			*ld.FlagDataAddr = 0
   117  		}
   118  		if *ld.FlagRound == -1 {
   119  			*ld.FlagRound = 4096
   120  		}
   121  
   122  	case objabi.Hnacl:
   123  		ld.Elfinit(ctxt)
   124  		ld.HEADR = 0x10000
   125  		ld.Funcalign = 32
   126  		if *ld.FlagTextAddr == -1 {
   127  			*ld.FlagTextAddr = 0x20000
   128  		}
   129  		if *ld.FlagDataAddr == -1 {
   130  			*ld.FlagDataAddr = 0
   131  		}
   132  		if *ld.FlagRound == -1 {
   133  			*ld.FlagRound = 0x10000
   134  		}
   135  
   136  	case objabi.Hwindows: /* PE executable */
   137  		// ld.HEADR, ld.FlagTextAddr, ld.FlagDataAddr and ld.FlagRound are set in ld.Peinit
   138  		return
   139  	}
   140  
   141  	if *ld.FlagDataAddr != 0 && *ld.FlagRound != 0 {
   142  		fmt.Printf("warning: -D0x%x is ignored because of -R0x%x\n", uint64(*ld.FlagDataAddr), uint32(*ld.FlagRound))
   143  	}
   144  }