github.com/dannin/go@v0.0.0-20161031215817-d35dfd405eaa/src/cmd/link/internal/arm/obj.go (about)

     1  // Inferno utils/5l/obj.c
     2  // https://bitbucket.org/inferno-os/inferno-os/src/default/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  )
    39  
    40  func Init() {
    41  	ld.SysArch = sys.ArchARM
    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.Trampoline = trampoline
    54  	ld.Thearch.Asmb = asmb
    55  	ld.Thearch.Elfreloc1 = elfreloc1
    56  	ld.Thearch.Elfsetupplt = elfsetupplt
    57  	ld.Thearch.Gentext = gentext
    58  	ld.Thearch.Machoreloc1 = machoreloc1
    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.3" // 2 for OABI, 3 for EABI
    67  	ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1"
    68  	ld.Thearch.Openbsddynld = "/usr/libexec/ld.so"
    69  	ld.Thearch.Netbsddynld = "/libexec/ld.elf_so"
    70  	ld.Thearch.Dragonflydynld = "XXX"
    71  	ld.Thearch.Solarisdynld = "XXX"
    72  }
    73  
    74  func archinit(ctxt *ld.Link) {
    75  	switch ld.Headtype {
    76  	default:
    77  		ld.Exitf("unknown -H option: %v", ld.Headtype)
    78  
    79  	case obj.Hplan9: /* plan 9 */
    80  		ld.HEADR = 32
    81  
    82  		if *ld.FlagTextAddr == -1 {
    83  			*ld.FlagTextAddr = 4128
    84  		}
    85  		if *ld.FlagDataAddr == -1 {
    86  			*ld.FlagDataAddr = 0
    87  		}
    88  		if *ld.FlagRound == -1 {
    89  			*ld.FlagRound = 4096
    90  		}
    91  
    92  	case obj.Hlinux, /* arm elf */
    93  		obj.Hfreebsd,
    94  		obj.Hnetbsd,
    95  		obj.Hopenbsd:
    96  		*ld.FlagD = false
    97  		// with dynamic linking
    98  		ld.Elfinit(ctxt)
    99  		ld.HEADR = ld.ELFRESERVE
   100  		if *ld.FlagTextAddr == -1 {
   101  			*ld.FlagTextAddr = 0x10000 + int64(ld.HEADR)
   102  		}
   103  		if *ld.FlagDataAddr == -1 {
   104  			*ld.FlagDataAddr = 0
   105  		}
   106  		if *ld.FlagRound == -1 {
   107  			*ld.FlagRound = 4096
   108  		}
   109  
   110  	case obj.Hnacl:
   111  		ld.Elfinit(ctxt)
   112  		ld.HEADR = 0x10000
   113  		ld.Funcalign = 16
   114  		if *ld.FlagTextAddr == -1 {
   115  			*ld.FlagTextAddr = 0x20000
   116  		}
   117  		if *ld.FlagDataAddr == -1 {
   118  			*ld.FlagDataAddr = 0
   119  		}
   120  		if *ld.FlagRound == -1 {
   121  			*ld.FlagRound = 0x10000
   122  		}
   123  
   124  	case obj.Hdarwin: /* apple MACH */
   125  		*ld.FlagW = true // disable DWARF generation
   126  		ld.Machoinit()
   127  		ld.HEADR = ld.INITIAL_MACHO_HEADR
   128  		if *ld.FlagTextAddr == -1 {
   129  			*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
   130  		}
   131  		if *ld.FlagDataAddr == -1 {
   132  			*ld.FlagDataAddr = 0
   133  		}
   134  		if *ld.FlagRound == -1 {
   135  			*ld.FlagRound = 4096
   136  		}
   137  	}
   138  
   139  	if *ld.FlagDataAddr != 0 && *ld.FlagRound != 0 {
   140  		fmt.Printf("warning: -D0x%x is ignored because of -R0x%x\n", uint64(*ld.FlagDataAddr), uint32(*ld.FlagRound))
   141  	}
   142  }