Source file src/pkg/cmd/link/internal/x86/obj.go

     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	)
    38	
    39	func Init() (*sys.Arch, ld.Arch) {
    40		arch := sys.Arch386
    41	
    42		theArch := ld.Arch{
    43			Funcalign:  funcAlign,
    44			Maxalign:   maxAlign,
    45			Minalign:   minAlign,
    46			Dwarfregsp: dwarfRegSP,
    47			Dwarfreglr: dwarfRegLR,
    48	
    49			Adddynrel:        adddynrel,
    50			Archinit:         archinit,
    51			Archreloc:        archreloc,
    52			Archrelocvariant: archrelocvariant,
    53			Asmb:             asmb,
    54			Asmb2:            asmb2,
    55			Elfreloc1:        elfreloc1,
    56			Elfsetupplt:      elfsetupplt,
    57			Gentext:          gentext,
    58			Machoreloc1:      machoreloc1,
    59			PEreloc1:         pereloc1,
    60	
    61			Linuxdynld:   "/lib/ld-linux.so.2",
    62			Freebsddynld: "/usr/libexec/ld-elf.so.1",
    63			Openbsddynld: "/usr/libexec/ld.so",
    64			Netbsddynld:  "/usr/libexec/ld.elf_so",
    65			Solarisdynld: "/lib/ld.so.1",
    66		}
    67	
    68		return arch, theArch
    69	}
    70	
    71	func archinit(ctxt *ld.Link) {
    72		switch ctxt.HeadType {
    73		default:
    74			ld.Exitf("unknown -H option: %v", ctxt.HeadType)
    75	
    76		case objabi.Hplan9: /* plan 9 */
    77			ld.HEADR = 32
    78	
    79			if *ld.FlagTextAddr == -1 {
    80				*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
    81			}
    82			if *ld.FlagRound == -1 {
    83				*ld.FlagRound = 4096
    84			}
    85	
    86		case objabi.Hdarwin: /* apple MACH */
    87			ld.HEADR = ld.INITIAL_MACHO_HEADR
    88			if *ld.FlagTextAddr == -1 {
    89				*ld.FlagTextAddr = 4096 + int64(ld.HEADR)
    90			}
    91			if *ld.FlagRound == -1 {
    92				*ld.FlagRound = 4096
    93			}
    94	
    95		case objabi.Hlinux, /* elf32 executable */
    96			objabi.Hfreebsd,
    97			objabi.Hnetbsd,
    98			objabi.Hopenbsd:
    99			ld.Elfinit(ctxt)
   100	
   101			ld.HEADR = ld.ELFRESERVE
   102			if *ld.FlagTextAddr == -1 {
   103				*ld.FlagTextAddr = 0x08048000 + int64(ld.HEADR)
   104			}
   105			if *ld.FlagRound == -1 {
   106				*ld.FlagRound = 4096
   107			}
   108	
   109		case objabi.Hnacl:
   110			ld.Elfinit(ctxt)
   111			ld.HEADR = 0x10000
   112			ld.Funcalign = 32
   113			if *ld.FlagTextAddr == -1 {
   114				*ld.FlagTextAddr = 0x20000
   115			}
   116			if *ld.FlagRound == -1 {
   117				*ld.FlagRound = 0x10000
   118			}
   119	
   120		case objabi.Hwindows: /* PE executable */
   121			// ld.HEADR, ld.FlagTextAddr, ld.FlagRound are set in ld.Peinit
   122			return
   123		}
   124	}
   125	

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