Imported Upstream version 1.3upstream/1.3

1 files changed, 65 insertions, 0 deletions

diff --git a/src/cmd/objdump/elf.go b/src/cmd/objdump/elf.go
new file mode 100644
index 000000000..906e90353
--- /dev/null
+++ b/src/cmd/objdump/elf.go
@@ -0,0 +1,65 @@
+// Copyright 2013 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Parsing of ELF executables (Linux, FreeBSD, and so on).
+
+package main
+
+import (
+	"debug/elf"
+	"os"
+)
+
+func elfSymbols(f *os.File) (syms []Sym, goarch string) {
+	p, err := elf.NewFile(f)
+	if err != nil {
+		errorf("parsing %s: %v", f.Name(), err)
+		return
+	}
+
+	elfSyms, err := p.Symbols()
+	if err != nil {
+		errorf("parsing %s: %v", f.Name(), err)
+		return
+	}
+
+	switch p.Machine {
+	case elf.EM_X86_64:
+		goarch = "amd64"
+	case elf.EM_386:
+		goarch = "386"
+	case elf.EM_ARM:
+		goarch = "arm"
+	}
+
+	for _, s := range elfSyms {
+		sym := Sym{Addr: s.Value, Name: s.Name, Size: int64(s.Size), Code: '?'}
+		switch s.Section {
+		case elf.SHN_UNDEF:
+			sym.Code = 'U'
+		case elf.SHN_COMMON:
+			sym.Code = 'B'
+		default:
+			i := int(s.Section)
+			if i < 0 || i >= len(p.Sections) {
+				break
+			}
+			sect := p.Sections[i]
+			switch sect.Flags & (elf.SHF_WRITE | elf.SHF_ALLOC | elf.SHF_EXECINSTR) {
+			case elf.SHF_ALLOC | elf.SHF_EXECINSTR:
+				sym.Code = 'T'
+			case elf.SHF_ALLOC:
+				sym.Code = 'R'
+			case elf.SHF_ALLOC | elf.SHF_WRITE:
+				sym.Code = 'D'
+			}
+		}
+		if elf.ST_BIND(s.Info) == elf.STB_LOCAL {
+			sym.Code += 'a' - 'A'
+		}
+		syms = append(syms, sym)
+	}
+
+	return
+}