mirror of https://github.com/golang/go.git
117 lines
3.9 KiB
Go
117 lines
3.9 KiB
Go
// Derived from Inferno utils/6l/obj.c and utils/6l/span.c
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// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/obj.c
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// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/span.c
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
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// Portions Copyright © 1997-1999 Vita Nuova Limited
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// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
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// Portions Copyright © 2004,2006 Bruce Ellis
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// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
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// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
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// Portions Copyright © 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package ld
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import (
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"cmd/internal/objabi"
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"cmd/internal/sys"
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"cmd/link/internal/loader"
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"cmd/link/internal/sym"
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"log"
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"runtime"
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)
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func linknew(arch *sys.Arch) *Link {
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ler := loader.ErrorReporter{AfterErrorAction: afterErrorAction}
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ctxt := &Link{
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Target: Target{Arch: arch},
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version: sym.SymVerStatic,
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outSem: make(chan int, 2*runtime.GOMAXPROCS(0)),
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Out: NewOutBuf(arch),
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LibraryByPkg: make(map[string]*sym.Library),
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numelfsym: 1,
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ErrorReporter: ErrorReporter{ErrorReporter: ler},
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generatorSyms: make(map[loader.Sym]generatorFunc),
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}
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if objabi.GOARCH != arch.Name {
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log.Fatalf("invalid objabi.GOARCH %s (want %s)", objabi.GOARCH, arch.Name)
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}
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AtExit(func() {
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if nerrors > 0 {
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ctxt.Out.Close()
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mayberemoveoutfile()
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}
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})
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return ctxt
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}
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// computeTLSOffset records the thread-local storage offset.
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// Not used for Android where the TLS offset is determined at runtime.
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func (ctxt *Link) computeTLSOffset() {
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switch ctxt.HeadType {
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default:
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log.Fatalf("unknown thread-local storage offset for %v", ctxt.HeadType)
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case objabi.Hplan9, objabi.Hwindows, objabi.Hjs, objabi.Haix:
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break
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case objabi.Hlinux,
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objabi.Hfreebsd,
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objabi.Hnetbsd,
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objabi.Hopenbsd,
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objabi.Hdragonfly,
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objabi.Hsolaris:
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/*
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* ELF uses TLS offset negative from FS.
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* Translate 0(FS) and 8(FS) into -16(FS) and -8(FS).
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* Known to low-level assembly in package runtime and runtime/cgo.
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*/
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ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize
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case objabi.Hdarwin:
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/*
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* OS X system constants - offset from 0(GS) to our TLS.
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*/
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switch ctxt.Arch.Family {
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default:
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log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name)
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/*
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* For x86, Apple has reserved a slot in the TLS for Go. See issue 23617.
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* That slot is at offset 0x30 on amd64.
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* The slot will hold the G pointer.
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* These constants should match those in runtime/sys_darwin_amd64.s
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* and runtime/cgo/gcc_darwin_amd64.c.
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*/
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case sys.AMD64:
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ctxt.Tlsoffset = 0x30
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case sys.ARM64:
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ctxt.Tlsoffset = 0 // dummy value, not needed
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}
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}
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}
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