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// 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"
"cmd/link/internal/sym"
"log"
"runtime"
)
func linknew(arch *sys.Arch) *Link {
ctxt := &Link{
Target: Target{Arch: arch},
Syms: sym.NewSymbols(),
outSem: make(chan int, 2*runtime.GOMAXPROCS(0)),
Out: NewOutBuf(arch),
LibraryByPkg: make(map[string]*sym.Library),
}
if objabi.GOARCH != arch.Name {
log.Fatalf("invalid objabi.GOARCH %s (want %s)", objabi.GOARCH, arch.Name)
}
AtExit(func() {
if nerrors > 0 {
ctxt.Out.Close()
mayberemoveoutfile()
}
})
return ctxt
}
// computeTLSOffset records the thread-local storage offset.
// Not used for Android where the TLS offset is determined at runtime.
func (ctxt *Link) computeTLSOffset() {
switch ctxt.HeadType {
default:
log.Fatalf("unknown thread-local storage offset for %v", ctxt.HeadType)
case objabi.Hplan9, objabi.Hwindows, objabi.Hjs, objabi.Haix:
break
case objabi.Hlinux,
objabi.Hfreebsd,
objabi.Hnetbsd,
objabi.Hopenbsd,
objabi.Hdragonfly,
objabi.Hsolaris:
/*
* 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.
*/
ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize
case objabi.Hdarwin:
/*
* OS X system constants - offset from 0(GS) to our TLS.
*/
switch ctxt.Arch.Family {
default:
log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name)
/*
* For x86, Apple has reserved a slot in the TLS for Go. See issue 23617.
* That slot is at offset 0x30 on amd64, and 0x18 on 386.
* The slot will hold the G pointer.
* These constants should match those in runtime/sys_darwin_{386,amd64}.s
* and runtime/cgo/gcc_darwin_{386,amd64}.c.
*/
case sys.I386:
ctxt.Tlsoffset = 0x18
case sys.AMD64:
ctxt.Tlsoffset = 0x30
case sys.ARM:
ctxt.Tlsoffset = 0 // dummy value, not needed
case sys.ARM64:
ctxt.Tlsoffset = 0 // dummy value, not needed
}
}
}
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