github.com/gocuntian/go@v0.0.0-20160610041250-fee02d270bf8/src/cmd/link/internal/arm/obj.go (about)

     1  // Inferno utils/5l/obj.c
     2  // http://code.google.com/p/inferno-os/source/browse/utils/5l/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 arm
    32  
    33  import (
    34  	"cmd/internal/obj"
    35  	"cmd/internal/sys"
    36  	"cmd/link/internal/ld"
    37  	"fmt"
    38  	"log"
    39  )
    40  
    41  // Reading object files.
    42  
    43  func Main() {
    44  	linkarchinit()
    45  	ld.Ldmain()
    46  }
    47  
    48  func linkarchinit() {
    49  	ld.SysArch = sys.ArchARM
    50  
    51  	ld.Thearch.Funcalign = FuncAlign
    52  	ld.Thearch.Maxalign = MaxAlign
    53  	ld.Thearch.Minalign = MinAlign
    54  	ld.Thearch.Dwarfregsp = DWARFREGSP
    55  	ld.Thearch.Dwarfreglr = DWARFREGLR
    56  
    57  	ld.Thearch.Adddynrel = adddynrel
    58  	ld.Thearch.Archinit = archinit
    59  	ld.Thearch.Archreloc = archreloc
    60  	ld.Thearch.Archrelocvariant = archrelocvariant
    61  	ld.Thearch.Asmb = asmb
    62  	ld.Thearch.Elfreloc1 = elfreloc1
    63  	ld.Thearch.Elfsetupplt = elfsetupplt
    64  	ld.Thearch.Gentext = gentext
    65  	ld.Thearch.Machoreloc1 = machoreloc1
    66  	ld.Thearch.Lput = ld.Lputl
    67  	ld.Thearch.Wput = ld.Wputl
    68  	ld.Thearch.Vput = ld.Vputl
    69  	ld.Thearch.Append16 = ld.Append16l
    70  	ld.Thearch.Append32 = ld.Append32l
    71  	ld.Thearch.Append64 = ld.Append64l
    72  
    73  	ld.Thearch.Linuxdynld = "/lib/ld-linux.so.3" // 2 for OABI, 3 for EABI
    74  	ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1"
    75  	ld.Thearch.Openbsddynld = "/usr/libexec/ld.so"
    76  	ld.Thearch.Netbsddynld = "/libexec/ld.elf_so"
    77  	ld.Thearch.Dragonflydynld = "XXX"
    78  	ld.Thearch.Solarisdynld = "XXX"
    79  }
    80  
    81  func archinit() {
    82  	// getgoextlinkenabled is based on GO_EXTLINK_ENABLED when
    83  	// Go was built; see ../../make.bash.
    84  	if ld.Linkmode == ld.LinkAuto && obj.Getgoextlinkenabled() == "0" {
    85  		ld.Linkmode = ld.LinkInternal
    86  	}
    87  
    88  	if ld.Buildmode == ld.BuildmodeCArchive || ld.Buildmode == ld.BuildmodeCShared || ld.DynlinkingGo() {
    89  		ld.Linkmode = ld.LinkExternal
    90  	}
    91  
    92  	switch ld.HEADTYPE {
    93  	default:
    94  		if ld.Linkmode == ld.LinkAuto {
    95  			ld.Linkmode = ld.LinkInternal
    96  		}
    97  		if ld.Linkmode == ld.LinkExternal && obj.Getgoextlinkenabled() != "1" {
    98  			log.Fatalf("cannot use -linkmode=external with -H %s", ld.Headstr(int(ld.HEADTYPE)))
    99  		}
   100  
   101  	case obj.Hlinux,
   102  		obj.Hfreebsd,
   103  		obj.Hnacl,
   104  		obj.Hdarwin:
   105  		break
   106  	}
   107  
   108  	switch ld.HEADTYPE {
   109  	default:
   110  		ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
   111  
   112  	case obj.Hplan9: /* plan 9 */
   113  		ld.HEADR = 32
   114  
   115  		if ld.INITTEXT == -1 {
   116  			ld.INITTEXT = 4128
   117  		}
   118  		if ld.INITDAT == -1 {
   119  			ld.INITDAT = 0
   120  		}
   121  		if ld.INITRND == -1 {
   122  			ld.INITRND = 4096
   123  		}
   124  
   125  	case obj.Hlinux, /* arm elf */
   126  		obj.Hfreebsd,
   127  		obj.Hnetbsd,
   128  		obj.Hopenbsd:
   129  		ld.Debug['d'] = 0
   130  		// with dynamic linking
   131  		ld.Elfinit()
   132  		ld.HEADR = ld.ELFRESERVE
   133  		if ld.INITTEXT == -1 {
   134  			ld.INITTEXT = 0x10000 + int64(ld.HEADR)
   135  		}
   136  		if ld.INITDAT == -1 {
   137  			ld.INITDAT = 0
   138  		}
   139  		if ld.INITRND == -1 {
   140  			ld.INITRND = 4096
   141  		}
   142  
   143  	case obj.Hnacl:
   144  		ld.Elfinit()
   145  		ld.HEADR = 0x10000
   146  		ld.Funcalign = 16
   147  		if ld.INITTEXT == -1 {
   148  			ld.INITTEXT = 0x20000
   149  		}
   150  		if ld.INITDAT == -1 {
   151  			ld.INITDAT = 0
   152  		}
   153  		if ld.INITRND == -1 {
   154  			ld.INITRND = 0x10000
   155  		}
   156  
   157  	case obj.Hdarwin: /* apple MACH */
   158  		ld.Debug['w'] = 1 // disable DWARF generation
   159  		ld.Machoinit()
   160  		ld.HEADR = ld.INITIAL_MACHO_HEADR
   161  		if ld.INITTEXT == -1 {
   162  			ld.INITTEXT = 4096 + int64(ld.HEADR)
   163  		}
   164  		if ld.INITDAT == -1 {
   165  			ld.INITDAT = 0
   166  		}
   167  		if ld.INITRND == -1 {
   168  			ld.INITRND = 4096
   169  		}
   170  	}
   171  
   172  	if ld.INITDAT != 0 && ld.INITRND != 0 {
   173  		fmt.Printf("warning: -D0x%x is ignored because of -R0x%x\n", uint64(ld.INITDAT), uint32(ld.INITRND))
   174  	}
   175  }