feat(asm): add .debug_frame CFI section for stack unwinding

Assisted-by: MiMo V2.5 Pro

asm/elf_dwarf_sections.go

@@ -12,6 +12,7 @@ type dwarfELFSections struct {
 	infoOff, infoSize       int
 	lineOff, lineSize       int
 	lineStrOff, lineStrSize int
+	frameOff, frameSize     int
 	// Relocations for .debug_info address references.
 	infoRelocs []elfDwarfReloc
 	// Relocations for .debug_line address references.
@@ -91,6 +92,14 @@ func appendDWARFSections(out *[]byte, img *Image, srcFile string, symIdx map[str
 	infoBase := len(*out)
 	*out = append(*out, ds.debugInfo...)
 
+	// .debug_frame
+	if len(ds.debugFrame) > 0 {
+		align(1)
+		result.frameOff = len(*out)
+		result.frameSize = len(ds.debugFrame)
+		*out = append(*out, ds.debugFrame...)
+	}
+
 	// Patch .debug_info relocations.
 	for _, dr := range ds.infoRelocs {
 		if idx, ok := nameToIdx[dr.name]; ok {
@@ -130,5 +139,5 @@ func dwarfRelaRecords(dw *dwarfELFSections, relType uint32) []byte {
 // dwarfSectionNames returns the DWARF section names for the string table.
 var dwarfSectionNames = []string{
 	".debug_abbrev", ".debug_info", ".debug_line", ".debug_line_str",
-	".rela.debug_info", ".rela.debug_line",
+	".debug_frame", ".rela.debug_info", ".rela.debug_line",
 }