github.com/yukk001/go1.10.8@v0.0.0-20190813125351-6df2d3982e20/src/cmd/link/internal/amd64/obj.go (about)

     1  // Inferno utils/6l/obj.c
     2  // https://bitbucket.org/inferno-os/inferno-os/src/default/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  	"fmt"
    38  )
    39  
    40  func Init() (*sys.Arch, ld.Arch) {
    41  	arch := sys.ArchAMD64
    42  	if objabi.GOARCH == "amd64p32" {
    43  		arch = sys.ArchAMD64P32
    44  	}
    45  
    46  	theArch := ld.Arch{
    47  		Funcalign:  funcAlign,
    48  		Maxalign:   maxAlign,
    49  		Minalign:   minAlign,
    50  		Dwarfregsp: dwarfRegSP,
    51  		Dwarfreglr: dwarfRegLR,
    52  
    53  		Adddynrel:        adddynrel,
    54  		Archinit:         archinit,
    55  		Archreloc:        archreloc,
    56  		Archrelocvariant: archrelocvariant,
    57  		Asmb:             asmb,
    58  		Elfreloc1:        elfreloc1,
    59  		Elfsetupplt:      elfsetupplt,
    60  		Gentext:          gentext,
    61  		Machoreloc1:      machoreloc1,
    62  		PEreloc1:         pereloc1,
    63  		TLSIEtoLE:        tlsIEtoLE,
    64  
    65  		Linuxdynld:     "/lib64/ld-linux-x86-64.so.2",
    66  		Freebsddynld:   "/libexec/ld-elf.so.1",
    67  		Openbsddynld:   "/usr/libexec/ld.so",
    68  		Netbsddynld:    "/libexec/ld.elf_so",
    69  		Dragonflydynld: "/usr/libexec/ld-elf.so.2",
    70  		Solarisdynld:   "/lib/amd64/ld.so.1",
    71  	}
    72  
    73  	return arch, theArch
    74  }
    75  
    76  func archinit(ctxt *ld.Link) {
    77  	switch ctxt.HeadType {
    78  	default:
    79  		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
    80  
    81  	case objabi.Hplan9: /* plan 9 */
    82  		ld.HEADR = 32 + 8
    83  
    84  		if *ld.FlagTextAddr == -1 {
    85  			*ld.FlagTextAddr = 0x200000 + int64(ld.HEADR)
    86  		}
    87  		if *ld.FlagDataAddr == -1 {
    88  			*ld.FlagDataAddr = 0
    89  		}
    90  		if *ld.FlagRound == -1 {
    91  			*ld.FlagRound = 0x200000
    92  		}
    93  
    94  	case objabi.Hdarwin: /* apple MACH */
    95  		ld.HEADR = ld.INITIAL_MACHO_HEADR
    96  		if *ld.FlagRound == -1 {
    97  			*ld.FlagRound = 4096
    98  		}
    99  		if *ld.FlagTextAddr == -1 {
   100  			*ld.FlagTextAddr = 0x1000000 + int64(ld.HEADR)
   101  		}
   102  		if *ld.FlagDataAddr == -1 {
   103  			*ld.FlagDataAddr = 0
   104  		}
   105  
   106  	case objabi.Hlinux, /* elf64 executable */
   107  		objabi.Hfreebsd,   /* freebsd */
   108  		objabi.Hnetbsd,    /* netbsd */
   109  		objabi.Hopenbsd,   /* openbsd */
   110  		objabi.Hdragonfly, /* dragonfly */
   111  		objabi.Hsolaris:   /* solaris */
   112  		ld.Elfinit(ctxt)
   113  
   114  		ld.HEADR = ld.ELFRESERVE
   115  		if *ld.FlagTextAddr == -1 {
   116  			*ld.FlagTextAddr = (1 << 22) + int64(ld.HEADR)
   117  		}
   118  		if *ld.FlagDataAddr == -1 {
   119  			*ld.FlagDataAddr = 0
   120  		}
   121  		if *ld.FlagRound == -1 {
   122  			*ld.FlagRound = 4096
   123  		}
   124  
   125  	case objabi.Hnacl:
   126  		ld.Elfinit(ctxt)
   127  		*ld.FlagW = true // disable dwarf, which gets confused and is useless anyway
   128  		ld.HEADR = 0x10000
   129  		ld.Funcalign = 32
   130  		if *ld.FlagTextAddr == -1 {
   131  			*ld.FlagTextAddr = 0x20000
   132  		}
   133  		if *ld.FlagDataAddr == -1 {
   134  			*ld.FlagDataAddr = 0
   135  		}
   136  		if *ld.FlagRound == -1 {
   137  			*ld.FlagRound = 0x10000
   138  		}
   139  
   140  	case objabi.Hwindows: /* PE executable */
   141  		// ld.HEADR, ld.FlagTextAddr, ld.FlagDataAddr and ld.FlagRound are set in ld.Peinit
   142  		return
   143  	}
   144  
   145  	if *ld.FlagDataAddr != 0 && *ld.FlagRound != 0 {
   146  		fmt.Printf("warning: -D0x%x is ignored because of -R0x%x\n", uint64(*ld.FlagDataAddr), uint32(*ld.FlagRound))
   147  	}
   148  }