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850c602ed6
Implement text address assignment and trampoline generation using the loader. Note: the trampoline insertion part doesn't actually work. It also needs to propagate Aux symbols for external symbols in LoadFull. But it won't be needed after converting pclntab generation, so I'll leave it out for now. This could break linking large binaries on PPC64 and ARM. Change-Id: Ie46a35b25d7c027983dd877207cfa8f67c32530b Reviewed-on: https://go-review.googlesource.com/c/go/+/227482 Reviewed-by: Than McIntosh <thanm@google.com>
139 lines
4.2 KiB
Go
139 lines
4.2 KiB
Go
// Derived from Inferno utils/6l/l.h and related files.
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// https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/l.h
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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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"bufio"
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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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"debug/elf"
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"fmt"
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)
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type Shlib struct {
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Path string
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Hash []byte
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Deps []string
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File *elf.File
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}
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// Link holds the context for writing object code from a compiler
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// or for reading that input into the linker.
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type Link struct {
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Target
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ErrorReporter
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ArchSyms
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outSem chan int // limits the number of output writers
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Out *OutBuf
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Syms *sym.Symbols
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Debugvlog int
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Bso *bufio.Writer
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Loaded bool // set after all inputs have been loaded as symbols
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compressDWARF bool
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Tlsg2 loader.Sym
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Libdir []string
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Library []*sym.Library
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LibraryByPkg map[string]*sym.Library
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Shlibs []Shlib
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Textp []*sym.Symbol
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Textp2 []loader.Sym
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Filesyms []*sym.Symbol
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Moduledata *sym.Symbol
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Moduledata2 loader.Sym
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PackageFile map[string]string
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PackageShlib map[string]string
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tramps []loader.Sym // trampolines
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// Used to implement field tracking.
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Reachparent map[*sym.Symbol]*sym.Symbol
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compUnits []*sym.CompilationUnit // DWARF compilation units
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runtimeCU *sym.CompilationUnit // One of the runtime CUs, the last one seen.
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loader *loader.Loader
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cgodata []cgodata // cgo directives to load, three strings are args for loadcgo
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cgo_export_static map[string]bool
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cgo_export_dynamic map[string]bool
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datap []*sym.Symbol
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dynexp2 []loader.Sym
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}
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type cgodata struct {
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file string
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pkg string
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directives [][]string
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}
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// The smallest possible offset from the hardware stack pointer to a local
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// variable on the stack. Architectures that use a link register save its value
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// on the stack in the function prologue and so always have a pointer between
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// the hardware stack pointer and the local variable area.
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func (ctxt *Link) FixedFrameSize() int64 {
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switch ctxt.Arch.Family {
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case sys.AMD64, sys.I386:
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return 0
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case sys.PPC64:
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// PIC code on ppc64le requires 32 bytes of stack, and it's easier to
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// just use that much stack always on ppc64x.
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return int64(4 * ctxt.Arch.PtrSize)
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default:
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return int64(ctxt.Arch.PtrSize)
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}
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}
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func (ctxt *Link) Logf(format string, args ...interface{}) {
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fmt.Fprintf(ctxt.Bso, format, args...)
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ctxt.Bso.Flush()
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}
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func addImports(ctxt *Link, l *sym.Library, pn string) {
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pkg := objabi.PathToPrefix(l.Pkg)
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for _, importStr := range l.ImportStrings {
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lib := addlib(ctxt, pkg, pn, importStr)
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if lib != nil {
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l.Imports = append(l.Imports, lib)
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}
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}
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l.ImportStrings = nil
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}
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