func (b *Builder) ExtractSymbolInfo() (error, *symbol.SymbolMap) {
syms := symbol.NewSymbolMap()
for _, bpkg := range b.PkgMap {
err, sm := b.ParseObjectLibrary(bpkg)
if err == nil {
syms, err = (*syms).Merge(sm)
if err != nil {
return err, nil
}
}
}
return nil, syms
}
func (b *Builder) FetchSymbolMap() (error, *symbol.SymbolMap) {
loader_sm := symbol.NewSymbolMap()
for _, value := range b.PkgMap {
err, sm := b.ParseObjectLibrary(value)
if err == nil {
util.StatusMessage(util.VERBOSITY_VERBOSE,
"Size of %s Loader Map %d\n", value.Name(), len(*sm))
loader_sm, err = loader_sm.Merge(sm)
if err != nil {
return err, nil
}
}
}
return nil, loader_sm
}
func (b *Builder) buildRomElf(common *symbol.SymbolMap) error {
/* check dependencies on the ROM ELF. This is really dependent on
* all of the .a files, but since we already depend on the loader
* .as to build the initial elf, we only need to check the app .a */
c, err := b.targetBuilder.NewCompiler(b.AppElfPath())
d := toolchain.NewDepTracker(c)
if err != nil {
return err
}
archNames := []string{}
/* build the set of archive file names */
for _, bpkg := range b.PkgMap {
archiveNames, _ := filepath.Glob(b.PkgBinDir(bpkg) + "/*.a")
archNames = append(archNames, archiveNames...)
}
bld, err := d.RomElfBuildRequired(b.AppLinkerElfPath(),
b.AppElfPath(), archNames)
if err != nil {
return err
}
if !bld {
return nil
}
util.StatusMessage(util.VERBOSITY_DEFAULT,
"Generating ROM elf \n")
/* the linker needs these symbols kept for the split app
* to initialize the loader data and bss */
common.Add(*symbol.NewElfSymbol("__HeapBase"))
common.Add(*symbol.NewElfSymbol("__bss_start__"))
common.Add(*symbol.NewElfSymbol("__bss_end__"))
common.Add(*symbol.NewElfSymbol("__etext"))
common.Add(*symbol.NewElfSymbol("__data_start__"))
common.Add(*symbol.NewElfSymbol("__data_end__"))
/* the split app may need this to access interrupts */
common.Add(*symbol.NewElfSymbol("__vector_tbl_reloc__"))
common.Add(*symbol.NewElfSymbol("__isr_vector"))
err = b.CopySymbols(common)
if err != nil {
return err
}
/* These symbols are needed by the split app so it can zero
* bss and copy data from the loader app before it restarts,
* but we have to rename them since it has its own copies of
* these special linker symbols */
tmp_sm := symbol.NewSymbolMap()
tmp_sm.Add(*symbol.NewElfSymbol("__HeapBase"))
tmp_sm.Add(*symbol.NewElfSymbol("__bss_start__"))
tmp_sm.Add(*symbol.NewElfSymbol("__bss_end__"))
tmp_sm.Add(*symbol.NewElfSymbol("__etext"))
tmp_sm.Add(*symbol.NewElfSymbol("__data_start__"))
tmp_sm.Add(*symbol.NewElfSymbol("__data_end__"))
err = c.RenameSymbols(tmp_sm, b.AppLinkerElfPath(), "_loader")
if err != nil {
return err
}
return nil
}
/*
* This function re-links the loader adding symbols from libraries
* shared with the app. Returns a list of the common packages shared
* by the app and loader
*/
func (t *TargetBuilder) RelinkLoader() (error, map[string]bool,
*symbol.SymbolMap) {
/* fetch symbols from the elf and from the libraries themselves */
log.Debugf("Loader packages:")
for _, lpkg := range t.LoaderBuilder.sortedLocalPackages() {
log.Debugf(" * %s", lpkg.Name())
}
log.Debugf("App packages:")
for _, lpkg := range t.AppBuilder.sortedLocalPackages() {
log.Debugf(" * %s", lpkg.Name())
}
err, appLibSym := t.AppBuilder.ExtractSymbolInfo()
if err != nil {
return err, nil, nil
}
/* fetch the symbol list from the app temporary elf */
err, appElfSym := t.AppBuilder.ParseObjectElf(t.AppBuilder.AppTempElfPath())
if err != nil {
return err, nil, nil
}
/* extract the library symbols and elf symbols from the loader */
err, loaderLibSym := t.LoaderBuilder.ExtractSymbolInfo()
if err != nil {
return err, nil, nil
}
err, loaderElfSym := t.LoaderBuilder.ParseObjectElf(
t.LoaderBuilder.AppTempElfPath())
if err != nil {
return err, nil, nil
}
/* create the set of matching and non-matching symbols */
err, smMatch, smNomatch := symbol.IdenticalUnion(appLibSym,
loaderLibSym, true, false)
/* which packages are shared between the two */
commonPkgs := smMatch.Packages()
uncommonPkgs := smNomatch.Packages()
/* ensure that the loader and app packages are never shared */
delete(commonPkgs, t.AppBuilder.appPkg.Name())
uncommonPkgs[t.AppBuilder.appPkg.Name()] = true
ma := smMatch.FilterPkg(t.AppBuilder.appPkg.Name())
smMatch.RemoveMap(ma)
delete(commonPkgs, t.LoaderBuilder.appPkg.Name())
uncommonPkgs[t.LoaderBuilder.appPkg.Name()] = true
ml := smMatch.FilterPkg(t.LoaderBuilder.appPkg.Name())
smMatch.RemoveMap(ml)
util.StatusMessage(util.VERBOSITY_VERBOSE,
"Putting %d symbols from %d packages into loader\n",
len(*smMatch), len(commonPkgs))
/* This is worth a special comment. We are building both apps as
* stand-alone apps against the normal linker file, so they will both
* have a Reset_Handler symbol. We need to ignore this here. When
* we build the split app, we use a special linker file which
* uses a different entry point */
specialSm := symbol.NewSymbolMap()
specialSm.Add(*symbol.NewElfSymbol("Reset_Handler(app)"))
specialSm.Add(*symbol.NewElfSymbol("Reset_Handler(loader)"))
var badpkgs []string
var symbolStr string
for v, _ := range uncommonPkgs {
if t.AppBuilder.appPkg != nil &&
t.AppBuilder.appPkg.Name() != v &&
t.LoaderBuilder.appPkg != nil &&
t.LoaderBuilder.appPkg.Name() != v {
trouble := smNomatch.FilterPkg(v)
var found bool
for _, sym := range *trouble {
if _, ok := specialSm.Find(sym.Name); !ok {
if !sym.IsLocal() {
found = true
}
}
}
if found {
symbolStr = (*trouble).String("Non Matching Symbols")
badpkgs = append(badpkgs, v)
delete(commonPkgs, v)
}
}
}
if len(badpkgs) > 0 {
errStr := fmt.Sprintf(
"Common packages with different implementation\n %s\n",
strings.Join(badpkgs, "\n "))
errStr += symbolStr
return util.NewNewtError(errStr), nil, nil
}
/* for each symbol in the elf of the app, if that symbol is in
* a common package, keep that symbol in the loader */
preserveElf := symbol.NewSymbolMap()
/* go through each symbol in the app */
for _, elfsym := range *appElfSym {
name := elfsym.Name
if libsym, ok := (*appLibSym)[name]; ok {
if _, ok := commonPkgs[libsym.Bpkg]; ok {
/* if its not in the loader elf, add it as undefined */
if _, ok := (*loaderElfSym)[name]; !ok {
preserveElf.Add(elfsym)
}
}
}
}
/* re-link loader */
project.ResetDeps(t.LoaderList)
util.StatusMessage(util.VERBOSITY_VERBOSE,
"Migrating %d unused symbols into Loader\n", len(*preserveElf))
err = t.LoaderBuilder.KeepLink(t.bspPkg.LinkerScripts, preserveElf)
if err != nil {
return err, nil, nil
}
return err, commonPkgs, smMatch
}
func (b *Builder) ParseObjectLibraryFile(bp *BuildPackage,
file string, textDataOnly bool) (error, *symbol.SymbolMap) {
c, err := b.targetBuilder.NewCompiler(b.AppElfPath())
ext := filepath.Ext(file)
if err != nil {
return err, nil
}
err, out := c.ParseLibrary(file)
if err != nil {
return err, nil
}
sm := symbol.NewSymbolMap()
buffer := bytes.NewBuffer(out)
err, r := getParseRexeg()
if err != nil {
return err, nil
}
for {
line, err := buffer.ReadString('\n')
if err != nil {
break
}
err, si := parseObjectLine(line, r)
if err == nil && si != nil {
/* assign the library */
if bp != nil {
(*si).Bpkg = bp.Name()
} else {
(*si).Bpkg = "elf"
}
/* discard undefined */
if (*si).IsSection("*UND*") {
continue
}
/* discard debug symbols */
if (*si).IsDebug() {
continue
}
if (*si).IsFile() {
continue
}
/* if we are looking for text and data only, do a special check */
if textDataOnly {
include := (*si).IsSection(".bss") ||
(*si).IsSection(".text") ||
(*si).IsSection(".data") ||
(*si).IsSection("*COM*") ||
(*si).IsSection(".rodata")
if !include {
continue
}
}
/* add the symbol to the map */
(*si).Ext = ext
sm.Add(*si)
util.StatusMessage(util.VERBOSITY_VERBOSE,
"Keeping Symbol %s in package %s\n", (*si).Name, (*si).Bpkg)
}
}
return nil, sm
}
