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// Derived from Inferno utils/6l/l.h and related files.
// https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/l.h
//
// 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 (
"bufio"
"cmd/internal/obj"
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/oldlink/internal/loader"
"cmd/oldlink/internal/sym"
"debug/elf"
"fmt"
)
type Shlib struct {
Path string
Hash []byte
Deps []string
File *elf.File
gcdataAddresses map[*sym.Symbol]uint64
}
// Link holds the context for writing object code from a compiler
// or for reading that input into the linker.
type Link struct {
Out *OutBuf
Syms *sym.Symbols
Arch *sys.Arch
Debugvlog int
Bso *bufio.Writer
Loaded bool // set after all inputs have been loaded as symbols
IsELF bool
HeadType objabi.HeadType
linkShared bool // link against installed Go shared libraries
LinkMode LinkMode
BuildMode BuildMode
canUsePlugins bool // initialized when Loaded is set to true
compressDWARF bool
Tlsg *sym.Symbol
Libdir []string
Library []*sym.Library
LibraryByPkg map[string]*sym.Library
Shlibs []Shlib
Tlsoffset int
Textp []*sym.Symbol
Filesyms []*sym.Symbol
Moduledata *sym.Symbol
PackageFile map[string]string
PackageShlib map[string]string
tramps []*sym.Symbol // trampolines
// unresolvedSymSet is a set of erroneous unresolved references.
// Used to avoid duplicated error messages.
unresolvedSymSet map[unresolvedSymKey]bool
// Used to implement field tracking.
Reachparent map[*sym.Symbol]*sym.Symbol
compUnits []*sym.CompilationUnit // DWARF compilation units
runtimeCU *sym.CompilationUnit // One of the runtime CUs, the last one seen.
relocbuf []byte // temporary buffer for applying relocations
loader *loader.Loader
cgodata []cgodata // cgo directives to load, three strings are args for loadcgo
cgo_export_static map[string]bool
cgo_export_dynamic map[string]bool
}
type cgodata struct {
file string
pkg string
directives [][]string
}
type unresolvedSymKey struct {
from *sym.Symbol // Symbol that referenced unresolved "to"
to *sym.Symbol // Unresolved symbol referenced by "from"
}
// ErrorUnresolved prints unresolved symbol error for r.Sym that is referenced from s.
func (ctxt *Link) ErrorUnresolved(s *sym.Symbol, r *sym.Reloc) {
if ctxt.unresolvedSymSet == nil {
ctxt.unresolvedSymSet = make(map[unresolvedSymKey]bool)
}
k := unresolvedSymKey{from: s, to: r.Sym}
if !ctxt.unresolvedSymSet[k] {
ctxt.unresolvedSymSet[k] = true
// Try to find symbol under another ABI.
var reqABI, haveABI obj.ABI
haveABI = ^obj.ABI(0)
reqABI, ok := sym.VersionToABI(int(r.Sym.Version))
if ok {
for abi := obj.ABI(0); abi < obj.ABICount; abi++ {
v := sym.ABIToVersion(abi)
if v == -1 {
continue
}
if rs := ctxt.Syms.ROLookup(r.Sym.Name, v); rs != nil && rs.Type != sym.Sxxx && rs.Type != sym.SXREF {
haveABI = abi
}
}
}
// Give a special error message for main symbol (see #24809).
if r.Sym.Name == "main.main" {
Errorf(s, "function main is undeclared in the main package")
} else if haveABI != ^obj.ABI(0) {
Errorf(s, "relocation target %s not defined for %s (but is defined for %s)", r.Sym.Name, reqABI, haveABI)
} else {
Errorf(s, "relocation target %s not defined", r.Sym.Name)
}
}
}
// The smallest possible offset from the hardware stack pointer to a local
// variable on the stack. Architectures that use a link register save its value
// on the stack in the function prologue and so always have a pointer between
// the hardware stack pointer and the local variable area.
func (ctxt *Link) FixedFrameSize() int64 {
switch ctxt.Arch.Family {
case sys.AMD64, sys.I386:
return 0
case sys.PPC64:
// PIC code on ppc64le requires 32 bytes of stack, and it's easier to
// just use that much stack always on ppc64x.
return int64(4 * ctxt.Arch.PtrSize)
default:
return int64(ctxt.Arch.PtrSize)
}
}
func (ctxt *Link) Logf(format string, args ...interface{}) {
fmt.Fprintf(ctxt.Bso, format, args...)
ctxt.Bso.Flush()
}
func addImports(ctxt *Link, l *sym.Library, pn string) {
pkg := objabi.PathToPrefix(l.Pkg)
for _, importStr := range l.ImportStrings {
lib := addlib(ctxt, pkg, pn, importStr)
if lib != nil {
l.Imports = append(l.Imports, lib)
}
}
l.ImportStrings = nil
}
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