newt: Generate link tables header

newt/builder/extcmd.go

@@ -184,6 +184,47 @@ func (t *TargetBuilder) execExtCmds(sf stage.StageFunc, userSrcDir string,
  return nil
 }
 
+func getLinkTableEntry(name string) string {
+ indent := " "
+
+ entry := indent + "__" + name + "_start__ = .;\n" +
+ indent + "KEEP(*(." + name + "))\n" +
+ indent + "__" + name + "_end__ = .;\n\n"
+
+ return entry
+}
+
+func (t *TargetBuilder) generateLinkTables() {
+ var s []string
+
+ for _, pkg := range t.res.LpkgRpkgMap {
+ s = append(s, pkg.Lpkg.LinkTables()...)
+ }
+
+ if len(s) == 0 {
+ return
+ }
+
+ dir := GeneratedBaseDir(t.target.FullName()) + "/link/include"
+ err := os.MkdirAll(dir, os.ModePerm)
+ if err != nil {
+ log.Error("Generate link tables error:\n", err)
+ return
+ }
+
+ linkHeader, err := os.Create(dir + "/link_tables.ld.h")
+ if err != nil {
+ log.Error("Generate link tables error:\n", err)
+ return
+ }
+
+ for _, linkTable := range s {
+ linkHeader.WriteString(getLinkTableEntry(linkTable))
+ }
+
+}
+
+//link tables
 // execPreBuildCmds runs the target's set of pre-build user commands. It is an
 // error if any command fails (exits with a nonzero status).
 func (t *TargetBuilder) execPreBuildCmds(workDir string) error {

newt/builder/targetbuild.go

@@ -581,6 +581,8 @@ func (t *TargetBuilder) Build() error {
  os.RemoveAll(workDir)
  }()
 
+ t.generateLinkTables()
+
  // Execute the set of pre-build user scripts.
  if err := t.execPreBuildCmds(workDir); err != nil {
  return err

newt/pkg/localpackage.go

@@ -59,6 +59,8 @@ type LocalPackage struct {
  // General information about the package
  desc *PackageDesc
 
+ linkTables []string
+
  // Extra package-specific settings that don't come from syscfg. For
  // example, SELFTEST gets set when the newt test command is used.
  injectedSettings *cfgv.Settings
@@ -145,6 +147,10 @@ func (pkg *LocalPackage) Desc() *PackageDesc {
  return pkg.desc
 }
 
+func (pkg *LocalPackage) LinkTables() []string {
+ return pkg.linkTables
+}
+
 func (pkg *LocalPackage) SetName(name string) {
  pkg.name = name
 }
@@ -197,6 +203,15 @@ func (pkg *LocalPackage) readDesc(yc ycfg.YCfg) (*PackageDesc, error) {
  return pdesc, nil
 }
 
+func (pkg *LocalPackage) readLinkTables(yc ycfg.YCfg) ([]string, error) {
+ var err error
+
+ sections, err := yc.GetValStringSlice("pkg.link_tables", nil)
+ util.OneTimeWarningError(err)
+
+ return sections, nil
+}
+
 func (pkg *LocalPackage) sequenceString(key string) string {
  var buffer bytes.Buffer
 
@@ -361,6 +376,8 @@ func (pkg *LocalPackage) Load() error {
  return err
  }
 
+ pkg.linkTables, err = pkg.readLinkTables(pkg.PkgY)
+
  // Load syscfg settings.
  pkg.SyscfgY, err = config.ReadFile(pkg.SyscfgYamlPath())
  if err != nil && !util.IsNotExist(err) {