...
Run Format

Source file src/cmd/link/internal/ld/sym.go

Documentation: cmd/link/internal/ld

  // Derived from Inferno utils/6l/obj.c and utils/6l/span.c
  // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/obj.c
  // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/span.c
  //
  //	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
  //	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
  //	Portions Copyright © 1997-1999 Vita Nuova Limited
  //	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
  //	Portions Copyright © 2004,2006 Bruce Ellis
  //	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
  //	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
  //	Portions Copyright © 2009 The Go Authors. All rights reserved.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  package ld
  
  import (
  	"cmd/internal/objabi"
  	"cmd/internal/sys"
  	"log"
  )
  
  func linknew(arch *sys.Arch) *Link {
  	ctxt := &Link{
  		Syms: &Symbols{
  			hash: []map[string]*Symbol{
  				// preallocate about 2mb for hash of
  				// non static symbols
  				make(map[string]*Symbol, 100000),
  			},
  			Allsym: make([]*Symbol, 0, 100000),
  		},
  		Arch:         arch,
  		LibraryByPkg: make(map[string]*Library),
  	}
  
  	if objabi.GOARCH != arch.Name {
  		log.Fatalf("invalid objabi.GOARCH %s (want %s)", objabi.GOARCH, arch.Name)
  	}
  
  	return ctxt
  }
  
  // computeTLSOffset records the thread-local storage offset.
  func (ctxt *Link) computeTLSOffset() {
  	switch Headtype {
  	default:
  		log.Fatalf("unknown thread-local storage offset for %v", Headtype)
  
  	case objabi.Hplan9, objabi.Hwindows:
  		break
  
  		/*
  		 * ELF uses TLS offset negative from FS.
  		 * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS).
  		 * Known to low-level assembly in package runtime and runtime/cgo.
  		 */
  	case objabi.Hlinux,
  		objabi.Hfreebsd,
  		objabi.Hnetbsd,
  		objabi.Hopenbsd,
  		objabi.Hdragonfly,
  		objabi.Hsolaris:
  		if objabi.GOOS == "android" {
  			switch ctxt.Arch.Family {
  			case sys.AMD64:
  				// Android/amd64 constant - offset from 0(FS) to our TLS slot.
  				// Explained in src/runtime/cgo/gcc_android_*.c
  				ctxt.Tlsoffset = 0x1d0
  			case sys.I386:
  				// Android/386 constant - offset from 0(GS) to our TLS slot.
  				ctxt.Tlsoffset = 0xf8
  			default:
  				ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize
  			}
  		} else {
  			ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize
  		}
  
  	case objabi.Hnacl:
  		switch ctxt.Arch.Family {
  		default:
  			log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name)
  
  		case sys.ARM:
  			ctxt.Tlsoffset = 0
  
  		case sys.AMD64:
  			ctxt.Tlsoffset = 0
  
  		case sys.I386:
  			ctxt.Tlsoffset = -8
  		}
  
  		/*
  		 * OS X system constants - offset from 0(GS) to our TLS.
  		 * Explained in src/runtime/cgo/gcc_darwin_*.c.
  		 */
  	case objabi.Hdarwin:
  		switch ctxt.Arch.Family {
  		default:
  			log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name)
  
  		case sys.ARM:
  			ctxt.Tlsoffset = 0 // dummy value, not needed
  
  		case sys.AMD64:
  			ctxt.Tlsoffset = 0x8a0
  
  		case sys.ARM64:
  			ctxt.Tlsoffset = 0 // dummy value, not needed
  
  		case sys.I386:
  			ctxt.Tlsoffset = 0x468
  		}
  	}
  
  }
  

View as plain text