import java.io.*;
import java.util.Arrays;
-// FEATURE: Look over the public API, make sure we're exposing a bare minimum
-// (we might make this an interface in the future)
-
public abstract class Runtime implements UsermodeConstants,Registers,Cloneable {
/** Number of bits to shift to get the page number (1<<<pageShift == pageSize) */
protected final int pageShift;
/** Bottom of region of memory allocated to the stack */
- protected final int stackBottom;
+ private final int stackBottom;
/** Readable main memory pages */
protected int[][] readPages;
boolean closeOnExec[] = new boolean[OPEN_MAX];
/** Pointer to a SecurityManager for this process */
- protected SecurityManager sm;
+ SecurityManager sm;
public void setSecurityManager(SecurityManager sm) { this.sm = sm; }
/** Pointer to a callback for the call_java syscall */
private byte[] _byteBuf;
/** Max size of temporary buffer
@see Runtime#_byteBuf */
- private final static int MAX_CHUNK = 16*1024*1024 - 1024;
+ final static int MAX_CHUNK = 16*1024*1024 - 1024;
/** Subclasses should actually execute program in this method. They should continue
executing until state != RUNNING. Only syscall() can modify state. It is safe
public final void memcpy(int dst, int src, int count) throws FaultException {
int pageWords = (1<<pageShift)>>>2;
int pageWordMask = pageWords - 1;
-
if((dst&3) == 0 && (src&3)==0) {
if((count&~3) != 0) {
int c = count>>2;
return start;
}
- protected String[] createEnv(String[] extra) { if(extra == null) extra = new String[0]; return extra; }
+ String[] createEnv(String[] extra) { if(extra == null) extra = new String[0]; return extra; }
/** Sets word number <i>index</i> in the _user_info table to <i>word</i>
* The user_info table is a chunk of memory in the program's memory defined by the
return state != PAUSED;
}
- protected static String[] concatArgv(String argv0, String[] rest) {
+ static String[] concatArgv(String argv0, String[] rest) {
String[] argv = new String[rest.length+1];
System.arraycopy(rest,0,argv,1,rest.length);
argv[0] = argv0;
}
/** Hook for subclasses to do their own startup */
- protected void _started() { }
+ void _started() { }
public final int call(String sym, Object[] args) throws CallException, FaultException {
if(state != PAUSED && state != CALLJAVA) throw new IllegalStateException("call() called in inappropriate state");
return cpustate.r[V1];
}
-
- /** Determines if the process can access <i>fileName</i>. The default implementation simply logs
- the request and allows it */
- protected boolean allowFileAccess(String fileName, boolean write) {
- //System.err.println("Allowing " + (write?"write":"read-only") + " access to " + fileName);
- return true;
- }
-
+
/** Allocated an entry in the FileDescriptor table for <i>fd</i> and returns the number.
Returns -1 if the table is full. This can be used by subclasses to use custom file
descriptors */
- public int addFD(FD fd) {
+ public final int addFD(FD fd) {
if(state == EXITED || state == EXECED) throw new IllegalStateException("addFD called in inappropriate state");
int i;
for(i=0;i<OPEN_MAX;i++) if(fds[i] == null) break;
}
/** Closes file descriptor <i>fdn</i> and removes it from the file descriptor table */
- public boolean closeFD(int fdn) {
+ public final boolean closeFD(int fdn) {
if(state == EXITED || state == EXECED) throw new IllegalStateException("closeFD called in inappropriate state");
if(fdn < 0 || fdn >= OPEN_MAX) return false;
if(fds[fdn] == null) return false;
}
/** Duplicates the file descriptor <i>fdn</i> and returns the new fs */
- public int dupFD(int fdn) {
+ public final int dupFD(int fdn) {
int i;
if(fdn < 0 || fdn >= OPEN_MAX) return -1;
if(fds[fdn] == null) return -1;
public static final int O_TRUNC = 0x0400;
public static final int O_NONBLOCK = 0x4000;
- FD hostFSOpen(final File f, int flags, int mode) throws ErrnoException {
+ FD hostFSOpen(final File f, int flags, int mode, final Object data) throws ErrnoException {
if((flags & ~(3|O_CREAT|O_EXCL|O_APPEND|O_TRUNC)) != 0) {
System.err.println("WARNING: Unsupported flags passed to open(): " + toHex(flags & ~(3|O_CREAT|O_EXCL|O_APPEND|O_TRUNC)));
throw new ErrnoException(ENOTSUP);
}
- boolean write = mode!=RD_ONLY;
+ boolean write = (flags&3) != RD_ONLY;
if(sm != null && !(write ? sm.allowWrite(f) : sm.allowRead(f))) throw new ErrnoException(EACCES);
} else if(!f.exists()) {
if((flags&O_CREAT)==0) return null;
} else if(f.isDirectory()) {
- return hostFSDirFD(f);
+ return hostFSDirFD(f,data);
}
final Seekable.File sf;
return null;
} catch(IOException e) { throw new ErrnoException(EIO); }
- return new SeekableFD(sf,flags) { protected FStat _fstat() { return hostFStat(f); } };
+ return new SeekableFD(sf,flags) { protected FStat _fstat() { return hostFStat(f,data); } };
}
- FStat hostFStat(File f) { return new HostFStat(f); }
- FD hostFSDirFD(File f) { return null; }
+ FStat hostFStat(File f, Object data) { return new HostFStat(f); }
+
+ FD hostFSDirFD(File f, Object data) { return null; }
FD _open(String path, int flags, int mode) throws ErrnoException {
- return hostFSOpen(new File(path),flags,mode);
+ return hostFSOpen(new File(path),flags,mode,null);
}
/** The open syscall */
}
/** The write syscall */
- private int sys_write(int fdn, int addr, int count) throws FaultException {
+
+ // FIXME: Handle pipe closed exception
+ private int sys_write(int fdn, int addr, int count) throws FaultException, ErrnoException {
count = Math.min(count,MAX_CHUNK);
if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
- if(fds[fdn] == null || !fds[fdn].writable()) return -EBADFD;
- try {
- byte[] buf = byteBuf(count);
- copyin(addr,buf,count);
- return fds[fdn].write(buf,0,count);
- } catch(IOException e) {
- // NOTE: This should really send a SIGPIPE
- if(e.getMessage().equals("Pipe closed")) return sys_exit(128+13);
- return -EIO;
- }
+ if(fds[fdn] == null) return -EBADFD;
+ byte[] buf = byteBuf(count);
+ copyin(addr,buf,count);
+ return fds[fdn].write(buf,0,count);
}
/** The read syscall */
- private int sys_read(int fdn, int addr, int count) throws FaultException {
+ private int sys_read(int fdn, int addr, int count) throws FaultException, ErrnoException {
count = Math.min(count,MAX_CHUNK);
if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
- if(fds[fdn] == null || !fds[fdn].readable()) return -EBADFD;
- try {
- byte[] buf = byteBuf(count);
- int n = fds[fdn].read(buf,0,count);
- copyout(buf,addr,n);
- return n;
- } catch(IOException e) {
- return -EIO;
- }
+ if(fds[fdn] == null) return -EBADFD;
+ byte[] buf = byteBuf(count);
+ int n = fds[fdn].read(buf,0,count);
+ copyout(buf,addr,n);
+ return n;
}
/** The close syscall */
/** The seek syscall */
- private int sys_lseek(int fdn, int offset, int whence) {
+ private int sys_lseek(int fdn, int offset, int whence) throws ErrnoException {
if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
if(fds[fdn] == null) return -EBADFD;
if(whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) return -EINVAL;
- try {
- int n = fds[fdn].seek(offset,whence);
- return n < 0 ? -ESPIPE : n;
- } catch(IOException e) {
- return -ESPIPE;
- }
+ int n = fds[fdn].seek(offset,whence);
+ return n < 0 ? -ESPIPE : n;
}
/** The stat/fstat syscall helper */
/** The sbrk syscall. This can also be used by subclasses to allocate memory.
<i>incr</i> is how much to increase the break by */
- public int sbrk(int incr) {
+ public final int sbrk(int incr) {
if(incr < 0) return -ENOMEM;
if(incr==0) return heapEnd;
incr = (incr+3)&~3;
/** The getpid syscall */
private int sys_getpid() { return getPid(); }
- protected int getPid() { return 1; }
+ int getPid() { return 1; }
public static interface CallJavaCB { public int call(int a, int b, int c, int d); }
private int sys_getpagesize() { return writePages.length == 1 ? 4096 : (1<<pageShift); }
- private int sys_isatty(int fdn) {
- if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
- if(fds[fdn] == null) return -EBADFD;
- return fds[fdn].isatty() ? 1 : 0;
- }
-
-
/** Hook for subclasses to do something when the process exits */
- protected void _exited() { }
+ void _exited() { }
private int sys_exit(int status) {
exitStatus = status;
fds[i] = fd.dup();
return 0;
case F_GETFL:
- int flags = 0;
- if(fd.writable() && fd.readable()) flags = 2;
- else if(fd.writable()) flags = 1;
- return flags;
+ return fd.flags();
case F_SETFD:
closeOnExec[fdn] = arg != 0;
return 0;
case SYS_sleep: return sys_sleep(a);
case SYS_times: return sys_times(a);
case SYS_getpagesize: return sys_getpagesize();
- case SYS_isatty: return sys_isatty(a);
case SYS_fcntl: return sys_fcntl(a,b,c);
case SYS_sysconf: return sys_sysconf(a);
+
+ case SYS_memcpy: memcpy(a,b,c); return a;
+ case SYS_memset: memset(a,b,c); return a;
case SYS_kill:
case SYS_fork:
}
/** Helper function to read a cstring from main memory */
- public String cstring(int addr) throws ReadFaultException {
+ public final String cstring(int addr) throws ReadFaultException {
StringBuffer sb = new StringBuffer();
for(;;) {
int word = memRead(addr&~3);
/** File Descriptor class */
public static abstract class FD {
private int refCount = 1;
-
- /** returns true if the fd is readable */
- public boolean readable() { return false; }
- /** returns true if the fd is writable */
- public boolean writable() { return false; }
/** Read some bytes. Should return the number of bytes read, 0 on EOF, or throw an IOException on error */
- public int read(byte[] a, int off, int length) throws IOException { throw new IOException("no definition"); }
+ public int read(byte[] a, int off, int length) throws ErrnoException { throw new ErrnoException(EBADFD); }
/** Write. Should return the number of bytes written or throw an IOException on error */
- public int write(byte[] a, int off, int length) throws IOException { throw new IOException("no definition"); }
+ public int write(byte[] a, int off, int length) throws ErrnoException { throw new ErrnoException(EBADFD); }
/** Seek in the filedescriptor. Whence is SEEK_SET, SEEK_CUR, or SEEK_END. Should return -1 on error or the new position. */
- public int seek(int n, int whence) throws IOException { return -1; }
+ public int seek(int n, int whence) throws ErrnoException { return -1; }
+
+ public int getdents(byte[] a, int off, int length) throws ErrnoException { throw new ErrnoException(EBADFD); }
+
+ public int flags() { return O_RDONLY; }
/** Return a Seekable object representing this file descriptor (can be read only)
This is required for exec() */
Seekable seekable() { return null; }
- /** Should return true if this is a tty */
- // FEATURE: get rid of the isatty syscall and just do with newlib's dumb isatty.c
- public boolean isatty() { return false; }
-
private FStat cachedFStat = null;
public final FStat fstat() {
if(cachedFStat == null) cachedFStat = _fstat();
public abstract static class SeekableFD extends FD {
private final int flags;
private final Seekable data;
- public boolean readable() { return (flags&3) != WR_ONLY; }
- public boolean writable() { return (flags&3) != RD_ONLY; }
SeekableFD(Seekable data, int flags) { this.data = data; this.flags = flags; }
protected abstract FStat _fstat();
+ public int flags() { return flags; }
Seekable seekable() { return data; }
- public int seek(int n, int whence) throws IOException {
- switch(whence) {
- case SEEK_SET: break;
- case SEEK_CUR: n += data.pos(); break;
- case SEEK_END: n += data.length(); break;
- default: return -1;
+ public int seek(int n, int whence) throws ErrnoException {
+ try {
+ switch(whence) {
+ case SEEK_SET: break;
+ case SEEK_CUR: n += data.pos(); break;
+ case SEEK_END: n += data.length(); break;
+ default: return -1;
+ }
+ data.seek(n);
+ return n;
+ } catch(IOException e) {
+ throw new ErrnoException(ESPIPE);
}
- data.seek(n);
- return n;
}
- public int write(byte[] a, int off, int length) throws IOException {
+ public int write(byte[] a, int off, int length) throws ErrnoException {
+ if((flags&3) == RD_ONLY) throw new ErrnoException(EBADFD);
// NOTE: There is race condition here but we can't fix it in pure java
if((flags&O_APPEND) != 0) seek(0,SEEK_END);
- return data.write(a,off,length);
+ try {
+ return data.write(a,off,length);
+ } catch(IOException e) {
+ throw new ErrnoException(EIO);
+ }
}
- public int read(byte[] a, int off, int length) throws IOException {
- int n = data.read(a,off,length);
- return n < 0 ? 0 : n;
+ public int read(byte[] a, int off, int length) throws ErrnoException {
+ if((flags&3) == WR_ONLY) throw new ErrnoException(EBADFD);
+ try {
+ int n = data.read(a,off,length);
+ return n < 0 ? 0 : n;
+ } catch(IOException e) {
+ throw new ErrnoException(EIO);
+ }
}
protected void _close() { try { data.close(); } catch(IOException e) { /*ignore*/ } }
public static class OutputStreamFD extends FD {
private OutputStream os;
- public boolean writable() { return true; }
+ public int flags() { return O_WRONLY; }
public OutputStreamFD(OutputStream os) { this.os = os; }
- public int write(byte[] a, int off, int length) throws IOException { os.write(a,off,length); return length; }
+ public int write(byte[] a, int off, int length) throws ErrnoException {
+ try {
+ os.write(a,off,length);
+ return length;
+ } catch(IOException e) {
+ throw new ErrnoException(EIO);
+ }
+ }
public void _close() { try { os.close(); } catch(IOException e) { /*ignore*/ } }
public FStat _fstat() { return new FStat(); }
}
public static class InputStreamFD extends FD {
private InputStream is;
- public boolean readable() { return true; }
+ public int flags() { return O_RDONLY; }
public InputStreamFD(InputStream is) { this.is = is; }
- public int read(byte[] a, int off, int length) throws IOException { int n = is.read(a,off,length); return n < 0 ? 0 : n; }
+ public int read(byte[] a, int off, int length) throws ErrnoException {
+ try {
+ int n = is.read(a,off,length);
+ return n < 0 ? 0 : n;
+ } catch(IOException e) {
+ throw new ErrnoException(EIO);
+ }
+ }
public void _close() { try { is.close(); } catch(IOException e) { /*ignore*/ } }
public FStat _fstat() { return new FStat(); }
}
- protected static class StdinFD extends InputStreamFD {
+ static class StdinFD extends InputStreamFD {
public StdinFD(InputStream is) { super(is); }
public void _close() { /* noop */ }
public FStat _fstat() { return new FStat() { public int type() { return S_IFCHR; } }; }
- public boolean isatty() { return true; }
}
- protected static class StdoutFD extends OutputStreamFD {
+
+ static class StdoutFD extends OutputStreamFD {
public StdoutFD(OutputStream os) { super(os); }
public void _close() { /* noop */ }
public FStat _fstat() { return new FStat() { public int type() { return S_IFCHR; } }; }
- public boolean isatty() { return true; }
}
public static class FStat {
public static final int S_IFDIR = 0040000;
public static final int S_IFREG = 0100000;
- public int dev() { return -1; }
- // FEATURE: inode numbers are calculated inconsistently throught the runtime
- public int inode() { return hashCode() & 0xfffff; }
+ public int dev() { return 1; }
+ public int inode() { return hashCode() & 0x7fff; }
public int mode() { return 0; }
public int type() { return S_IFIFO; }
public int nlink() { return 0; }
public int blocks() { return (size()+blksize()-1)/blksize(); }
}
- protected static class HostFStat extends FStat {
+ static class HostFStat extends FStat {
private final File f;
private final boolean executable;
- public HostFStat(File f) {
+ public HostFStat(File f) { this(f,false); }
+ public HostFStat(File f, boolean executable) {
this.f = f;
- executable = executable();
+ this.executable = executable;
}
public int dev() { return 1; }
public int inode() { return f.getName().hashCode() & 0xffff; }
return mode;
}
public int size() { return (int) f.length(); }
- public int mtime() { return (int)(f.lastModified()/1000); }
-
- boolean executable() { return false; }
+ public int mtime() { return (int)(f.lastModified()/1000); }
}
// Exceptions
- public class ReadFaultException extends FaultException {
+ public static class ReadFaultException extends FaultException {
public ReadFaultException(int addr) { super(addr); }
}
- public class WriteFaultException extends FaultException {
+ public static class WriteFaultException extends FaultException {
public WriteFaultException(int addr) { super(addr); }
}
- public abstract class FaultException extends ExecutionException {
- public int addr;
- public FaultException(int addr) { super("fault at: " + toHex(addr)); this.addr = addr; }
+ public static class FaultException extends ExecutionException {
+ public final int addr;
+ public final RuntimeException cause;
+ public FaultException(int addr) { super("fault at: " + toHex(addr)); this.addr = addr; cause = null; }
+ public FaultException(RuntimeException e) { super(e.toString()); addr = -1; cause = e; }
}
public static class ExecutionException extends Exception {
private String message = "(null)";
}
// Utility functions
- private byte[] byteBuf(int size) {
+ byte[] byteBuf(int size) {
if(_byteBuf==null) _byteBuf = new byte[size];
else if(_byteBuf.length < size)
_byteBuf = new byte[min(max(_byteBuf.length*2,size),MAX_CHUNK)];
return _byteBuf;
}
- protected static String getSystemProperty(String key) {
+ static String getSystemProperty(String key) {
try {
return System.getProperty(key);
} catch(SecurityException e) {
return buf;
}
- protected static byte[] getBytes(String s) {
+ static byte[] getBytes(String s) {
try {
return s.getBytes("ISO-8859-1");
} catch(UnsupportedEncodingException e) {
}
}
- protected final static String toHex(int n) { return "0x" + Long.toString(n & 0xffffffffL, 16); }
- protected final static int min(int a, int b) { return a < b ? a : b; }
- protected final static int max(int a, int b) { return a > b ? a : b; }
+ final static String toHex(int n) { return "0x" + Long.toString(n & 0xffffffffL, 16); }
+ final static int min(int a, int b) { return a < b ? a : b; }
+ final static int max(int a, int b) { return a > b ? a : b; }
}
projects / nestedvm.git / blobdiff