github.com/epfl-dcsl/gotee@v0.0.0-20200909122901-014b35f5e5e9/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/objabi"
    35  	"cmd/internal/sys"
    36  	"cmd/link/internal/ld"
    37  	"fmt"
    38  )
    39  
    40  func Init() (*sys.Arch, ld.Arch) {
    41  	arch := sys.ArchARM
    42  
    43  	theArch := ld.Arch{
    44  		Funcalign:  funcAlign,
    45  		Maxalign:   maxAlign,
    46  		Minalign:   minAlign,
    47  		Dwarfregsp: dwarfRegSP,
    48  		Dwarfreglr: dwarfRegLR,
    49  
    50  		Adddynrel:        adddynrel,
    51  		Archinit:         archinit,
    52  		Archreloc:        archreloc,
    53  		Archrelocvariant: archrelocvariant,
    54  		Trampoline:       trampoline,
    55  		Asmb:             asmb,
    56  		Elfreloc1:        elfreloc1,
    57  		Elfsetupplt:      elfsetupplt,
    58  		Gentext:          gentext,
    59  		Machoreloc1:      machoreloc1,
    60  
    61  		Linuxdynld:     "/lib/ld-linux.so.3", // 2 for OABI, 3 for EABI
    62  		Freebsddynld:   "/usr/libexec/ld-elf.so.1",
    63  		Openbsddynld:   "/usr/libexec/ld.so",
    64  		Netbsddynld:    "/libexec/ld.elf_so",
    65  		Dragonflydynld: "XXX",
    66  		Solarisdynld:   "XXX",
    67  	}
    68  
    69  	return arch, theArch
    70  }
    71  
    72  func archinit(ctxt *ld.Link) {
    73  	switch ctxt.HeadType {
    74  	default:
    75  		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
    76  
    77  	case objabi.Hplan9: /* plan 9 */
    78  		ld.HEADR = 32
    79  
    80  		if *ld.FlagTextAddr == -1 {
    81  			*ld.FlagTextAddr = 4128
    82  		}
    83  		if *ld.FlagDataAddr == -1 {
    84  			*ld.FlagDataAddr = 0
    85  		}
    86  		if *ld.FlagRound == -1 {
    87  			*ld.FlagRound = 4096
    88  		}
    89  
    90  	case objabi.Hlinux, /* arm elf */
    91  		objabi.Hfreebsd,
    92  		objabi.Hnetbsd,
    93  		objabi.Hopenbsd:
    94  		*ld.FlagD = false
    95  		// with dynamic linking
    96  		ld.Elfinit(ctxt)
    97  		ld.HEADR = ld.ELFRESERVE
    98  		if *ld.FlagTextAddr == -1 {
    99  			*ld.FlagTextAddr = 0x10000 + int64(ld.HEADR)
   100  		}
   101  		if *ld.FlagDataAddr == -1 {
   102  			*ld.FlagDataAddr = 0
   103  		}
   104  		if *ld.FlagRound == -1 {
   105  			*ld.FlagRound = 0x10000
   106  		}
   107  
   108  	case objabi.Hnacl:
   109  		ld.Elfinit(ctxt)
   110  		ld.HEADR = 0x10000
   111  		ld.Funcalign = 16
   112  		if *ld.FlagTextAddr == -1 {
   113  			*ld.FlagTextAddr = 0x20000
   114  		}
   115  		if *ld.FlagDataAddr == -1 {
   116  			*ld.FlagDataAddr = 0
   117  		}
   118  		if *ld.FlagRound == -1 {
   119  			*ld.FlagRound = 0x10000
   120  		}
   121  
   122  	case objabi.Hdarwin: /* apple MACH */
   123  		*ld.FlagW = true // disable DWARF generation
   124  		ld.HEADR = ld.INITIAL_MACHO_HEADR
   125  		if *ld.FlagTextAddr == -1 {
   126  			*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
   127  		}
   128  		if *ld.FlagDataAddr == -1 {
   129  			*ld.FlagDataAddr = 0
   130  		}
   131  		if *ld.FlagRound == -1 {
   132  			*ld.FlagRound = 4096
   133  		}
   134  	}
   135  
   136  	if *ld.FlagDataAddr != 0 && *ld.FlagRound != 0 {
   137  		fmt.Printf("warning: -D0x%x is ignored because of -R0x%x\n", uint64(*ld.FlagDataAddr), uint32(*ld.FlagRound))
   138  	}
   139  }