+++ /dev/null
-package org.xwt.mips;
-
-import org.xwt.mips.util.*;
-import java.io.*;
-
-public class ELF {
- private SeekableData data;
-
- public ELFIdent ident;
- public ELFHeader header;
- public PHeader[] pheaders;
- public SHeader[] sheaders;
-
- private byte[] stringTable;
-
- private boolean sectionReaderActive;
-
-
- private void readFully(byte[] buf) throws IOException {
- int len = buf.length;
- int pos = 0;
- while(len > 0) {
- int n = data.read(buf,pos,len);
- if(n == -1) throw new IOException("EOF");
- pos += n;
- len -= n;
- }
- }
-
- private int readIntBE() throws IOException {
- byte[] buf = new byte[4];
- readFully(buf);
- return ((buf[0]&0xff)<<24)|((buf[1]&0xff)<<16)|((buf[2]&0xff)<<8)|((buf[3]&0xff)<<0);
- }
- private int readInt() throws IOException {
- int x = readIntBE();
- if(ident!=null && ident.data == ELFIdent.ELFDATA2LSB)
- x = ((x<<24)&0xff000000) | ((x<<8)&0xff0000) | ((x>>>8)&0xff00) | ((x>>24)&0xff);
- return x;
- }
-
- private short readShortBE() throws IOException {
- byte[] buf = new byte[2];
- readFully(buf);
- return (short)(((buf[0]&0xff)<<8)|((buf[1]&0xff)<<0));
- }
- private short readShort() throws IOException {
- short x = readShortBE();
- if(ident!=null && ident.data == ELFIdent.ELFDATA2LSB)
- x = (short)((((x<<8)&0xff00) | ((x>>8)&0xff))&0xffff);
- return x;
- }
-
- private byte readByte() throws IOException {
- byte[] buf = new byte[1];
- readFully(buf);
- return buf[0];
- }
-
- public class ELFIdent {
- private static final int ELF_MAGIC = 0x7f454c46; // '\177', 'E', 'L', 'F'
-
- public static final int ELFCLASSNONE = 0;
- public static final int ELFCLASS32 = 1;
- public static final int ELFCLASS64 = 2;
- public byte klass;
-
-
- public static final int ELFDATANONE = 0;
- public static final int ELFDATA2LSB = 1;
- public static final int ELFDATA2MSB = 2;
- public byte data;
- public byte osabi;
- public byte abiversion;
-
- ELFIdent() throws IOException {
- if(readIntBE() != ELF_MAGIC) throw new ELFException("Bad Magic (is: " );
-
- klass = readByte();
- if(klass != ELFCLASS32) throw new ELFException("org.xwt.mips.ELF does not suport 64-bit binaries");
-
- data = readByte();
- if(data != ELFDATA2LSB && data != ELFDATA2MSB) throw new ELFException("Unknown byte order");
-
- readByte(); // version
- osabi = readByte();
- abiversion = readByte();
- for(int i=0;i<7;i++) readByte(); // padding
- }
- }
-
- public class ELFHeader {
- public static final short ET_EXEC = 2;
- public short type;
-
- public static final short EM_MIPS = 8;
- public short machine;
-
- public int version;
- public int entry;
- public int phoff;
- public int shoff;
- public int flags;
- public short ehsize;
- public short phentsize;
- public short phnum;
- public short shentsize;
- public short shnum;
- public short shstrndx;
-
- ELFHeader() throws IOException {
- type = readShort();
- machine = readShort();
- version = readInt();
- if(version != 1) throw new ELFException("version != 1");
- entry = readInt();
- phoff = readInt();
- shoff = readInt();
- flags = readInt();
- ehsize = readShort();
- phentsize = readShort();
- phnum = readShort();
- shentsize = readShort();
- shnum = readShort();
- shstrndx = readShort();
- }
- }
-
- public class PHeader {
- public int type;
- public int offset;
- public int vaddr;
- public int paddr;
- public int filesz;
- public int memsz;
- public int flags;
- public int align;
-
- public static final int PF_X = 0x1;
- public static final int PF_W = 0x2;
- public static final int PF_R = 0x4;
-
- public static final int PT_LOAD = 1;
-
- PHeader() throws IOException {
- type = readInt();
- offset = readInt();
- vaddr = readInt();
- paddr = readInt();
- filesz = readInt();
- memsz = readInt();
- flags = readInt();
- align = readInt();
- if(filesz > memsz) throw new ELFException("ELF inconsistency: filesz > memsz (" + toHex(filesz) + " > " + toHex(memsz) + ")");
- }
-
- public boolean writable() { return (flags & PF_W) != 0; }
-
- public InputStream getInputStream() throws IOException {
- return new BufferedInputStream(new SectionInputStream(
- offset,offset+filesz));
- }
- }
-
- public class SHeader {
- int nameidx;
- public String name;
- public int type;
- public int flags;
- public int addr;
- public int offset;
- public int size;
- public int link;
- public int info;
- public int addralign;
- public int entsize;
-
- public static final int SHT_SYMTAB = 2;
- public static final int SHT_STRTAB = 3;
- public static final int SHT_NOBITS = 8;
-
- SHeader() throws IOException {
- nameidx = readInt();
- type = readInt();
- flags = readInt();
- addr = readInt();
- offset = readInt();
- size = readInt();
- link = readInt();
- info = readInt();
- addralign = readInt();
- entsize = readInt();
- }
-
- public InputStream getInputStream() throws IOException {
- return new BufferedInputStream(new SectionInputStream(
- offset, type == SHT_NOBITS ? 0 : offset+size));
- }
-
- public boolean isText() { return name.equals(".text"); }
- public boolean isData() { return name.equals(".data") || name.equals(".sdata") || name.equals(".rodata") || name.equals(".ctors") || name.equals(".dtors"); }
- public boolean isBSS() { return name.equals(".bss") || name.equals(".sbss"); }
- }
-
- public ELF(String file) throws IOException, ELFException { this(new SeekableFile(file,false)); }
- public ELF(SeekableData data) throws IOException, ELFException {
- this.data = data;
- ident = new ELFIdent();
- header = new ELFHeader();
- pheaders = new PHeader[header.phnum];
- for(int i=0;i<header.phnum;i++) {
- data.seek(header.phoff+i*header.phentsize);
- pheaders[i] = new PHeader();
- }
- sheaders = new SHeader[header.shnum];
- for(int i=0;i<header.shnum;i++) {
- data.seek(header.shoff+i*header.shentsize);
- sheaders[i] = new SHeader();
- }
- if(header.shstrndx < 0 || header.shstrndx >= header.shnum) throw new ELFException("Bad shstrndx");
- data.seek(sheaders[header.shstrndx].offset);
- stringTable = new byte[sheaders[header.shstrndx].size];
- readFully(stringTable);
-
- for(int i=0;i<header.shnum;i++) {
- SHeader s = sheaders[i];
- s.name = getString(s.nameidx);
- }
- }
-
- private String getString(int off) { return getString(off,stringTable); }
- private String getString(int off,byte[] strtab) {
- StringBuffer sb = new StringBuffer();
- if(off < 0 || off >= strtab.length) return "<invalid strtab entry>";
- while(off >= 0 && off < strtab.length && strtab[off] != 0) sb.append((char)strtab[off++]);
- return sb.toString();
- }
-
- public SHeader sectionWithName(String name) {
- for(int i=0;i<sheaders.length;i++)
- if(sheaders[i].name.equals(name))
- return sheaders[i];
- return null;
- }
-
- public class ELFException extends IOException { ELFException(String s) { super(s); } }
-
- private class SectionInputStream extends InputStream {
- private int pos;
- private int maxpos;
- SectionInputStream(int start, int end) throws IOException {
- if(sectionReaderActive)
- throw new IOException("Section reader already active");
- sectionReaderActive = true;
- pos = start;
- data.seek(pos);
- maxpos = end;
- }
-
- private int bytesLeft() { return maxpos - pos; }
- public int read() throws IOException {
- byte[] buf = new byte[1];
- return read(buf,0,1) == -1 ? -1 : (buf[0]&0xff);
- }
- public int read(byte[] b, int off, int len) throws IOException {
- int n = data.read(b,off,Math.min(len,bytesLeft())); if(n > 0) pos += n; return n;
- }
- public void close() { sectionReaderActive = false; }
- }
-
- private Symtab _symtab;
- public Symtab getSymtab() throws IOException {
- if(_symtab != null) return _symtab;
-
- if(sectionReaderActive) throw new ELFException("Can't read the symtab while a section reader is active");
-
- SHeader sh = sectionWithName(".symtab");
- if(sh == null || sh.type != SHeader.SHT_SYMTAB) return null;
-
- SHeader sth = sectionWithName(".strtab");
- if(sth == null || sth.type != SHeader.SHT_STRTAB) return null;
-
- byte[] strtab = new byte[sth.size];
- DataInputStream dis = new DataInputStream(sth.getInputStream());
- dis.readFully(strtab);
- dis.close();
-
- return _symtab = new Symtab(sh.offset, sh.size,strtab);
- }
-
- public class Symtab {
- public Symbol[] symbols;
-
- Symtab(int off, int size, byte[] strtab) throws IOException {
- data.seek(off);
- int count = size/16;
- symbols = new Symbol[count];
- for(int i=0;i<count;i++) symbols[i] = new Symbol(strtab);
- }
-
- public Symbol getSymbol(String name) {
- Symbol sym = null;
- for(int i=0;i<symbols.length;i++) {
- if(symbols[i].name.equals(name)) {
- if(sym == null)
- sym = symbols[i];
- else
- System.err.println("WARNING: Multiple symbol matches for " + name);
- }
- }
- return sym;
- }
-
- public Symbol getGlobalSymbol(String name) {
- for(int i=0;i<symbols.length;i++)
- if(symbols[i].binding == Symbol.STB_GLOBAL && symbols[i].name.equals(name))
- return symbols[i];
- return null;
- }
- }
-
- public class Symbol {
- public String name;
- public int addr;
- public int size;
- public byte info;
- public byte type;
- public byte binding;
- public byte other;
- public SHeader sheader;
-
- public final static int STT_FUNC = 2;
- public final static int STB_GLOBAL = 1;
-
- Symbol(byte[] strtab) throws IOException {
- name = getString(readInt(),strtab);
- addr = readInt();
- size = readInt();
- info = readByte();
- type = (byte)(info&0xf);
- binding = (byte)(info>>4);
- other = readByte();
- // FEATURE: This should point to some other entry or something
- readShort();
- }
- }
-
- private static String toHex(int n) { return "0x" + Long.toString(n & 0xffffffffL, 16); }
-
- public static void main(String[] args) throws IOException {
- ELF elf = new ELF(new SeekableInputStream(new FileInputStream(args[0])));
- System.out.println("Type: " + toHex(elf.header.type));
- System.out.println("Machine: " + toHex(elf.header.machine));
- System.out.println("Entry: " + toHex(elf.header.entry));
- for(int i=0;i<elf.pheaders.length;i++) {
- ELF.PHeader ph = elf.pheaders[i];
- System.out.println("PHeader " + toHex(i));
- System.out.println("\tOffset: " + ph.offset);
- System.out.println("\tVaddr: " + toHex(ph.vaddr));
- System.out.println("\tFile Size: " + ph.filesz);
- System.out.println("\tMem Size: " + ph.memsz);
- }
- for(int i=0;i<elf.sheaders.length;i++) {
- ELF.SHeader sh = elf.sheaders[i];
- System.out.println("SHeader " + toHex(i));
- System.out.println("\tName: " + sh.name);
- System.out.println("\tOffset: " + sh.offset);
- System.out.println("\tAddr: " + toHex(sh.addr));
- System.out.println("\tSize: " + sh.size);
- System.out.println("\tType: " + toHex(sh.type));
- }
- Symtab symtab = elf.getSymtab();
- if(symtab != null) {
- System.out.println("Symbol table:");
- for(int i=0;i<symtab.symbols.length;i++)
- System.out.println("\t" + symtab.symbols[i].name + " -> " + toHex(symtab.symbols[i].addr));
- } else {
- System.out.println("Symbol table: None");
- }
- }
-}
projects / nestedvm.git / blobdiff