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 {
+ /** True to write useful diagnostic information to stderr when things go wrong */
+ final static boolean STDERR_DIAG = true;
+
/** 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;
FD[] fds = new FD[OPEN_MAX]; // package-private for UnixRuntime
boolean closeOnExec[] = new boolean[OPEN_MAX];
+ /** Pointer to a SecurityManager for this process */
+ SecurityManager sm;
+ public void setSecurityManager(SecurityManager sm) { this.sm = sm; }
+
/** Pointer to a callback for the call_java syscall */
- protected CallJavaCB callJavaCB;
+ private CallJavaCB callJavaCB;
public void setCallJavaCB(CallJavaCB callJavaCB) { this.callJavaCB = callJavaCB; }
- public CallJavaCB getCallJavaCB() { return callJavaCB; }
/** Temporary buffer for read/write operations */
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
protected abstract void setCPUState(CPUState state);
protected Object clone() throws CloneNotSupportedException {
- Runtime r = (Runtime) super.clone();
+ Runtime r = (Runtime) super.clone();
r._byteBuf = null;
r.startTime = 0;
r.fds = new FD[OPEN_MAX];
r.readPages = new int[totalPages][];
r.writePages = new int[totalPages][];
for(int i=0;i<totalPages;i++) {
- if(readPages[i] == null) continue;
+ if(readPages[i] == null) continue;
if(writePages[i] == null) r.readPages[i] = readPages[i];
else r.readPages[i] = r.writePages[i] = (int[])writePages[i].clone();
}
int heapStart = heapStart();
int totalMemory = totalPages * pageSize;
- int stackSize = max(totalMemory/64,ARG_MAX+65536);
+ int stackSize = max(totalMemory/512,ARG_MAX+65536);
int stackPages = 0;
if(totalPages > 1) {
stackSize = max(stackSize,pageSize);
- stackSize = (stackSize + pageSize) & ~(pageSize-1);
+ stackSize = (stackSize + pageSize - 1) & ~(pageSize-1);
stackPages = stackSize >>> pageShift;
- heapStart = (heapStart + pageSize) & ~(pageSize-1);
+ heapStart = (heapStart + pageSize - 1) & ~(pageSize-1);
if(stackPages + STACK_GUARD_PAGES + (heapStart >>> pageShift) >= totalPages)
throw new IllegalArgumentException("total pages too small");
} else {
readPages = new int[totalPages][];
writePages = new int[totalPages][];
- if(totalPages == 1)
+ if(totalPages == 1) {
readPages[0] = writePages[0] = new int[pageSize>>2];
- else
- for(int i=stackBottom >>> pageShift;i<writePages.length;i++)
- readPages[i] = writePages[i] = new int[pageSize>>2];
+ } else {
+ for(int i=(stackBottom >>> pageShift);i<writePages.length;i++) {
+ readPages[i] = writePages[i] = new int[pageSize>>2];
+ }
+ }
addFD(new StdinFD(System.in));
addFD(new StdoutFD(System.out));
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;
addr += 4;
}
} catch(FaultException e) {
- // should never happen
- throw new Error(e.toString());
+ throw new RuntimeException(e.toString());
}
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
}
/** Calls _execute() (subclass's execute()) and catches exceptions */
+ // FEATURE: Have these call kill() so we get a pretty message to stdout
private void __execute() {
try {
_execute();
} catch(FaultException e) {
- e.printStackTrace();
+ if(STDERR_DIAG) e.printStackTrace();
sys_exit(128+11); // SIGSEGV
exitException = e;
} catch(ExecutionException e) {
- e.printStackTrace();
- System.err.println(e);
+ if(STDERR_DIAG) e.printStackTrace();
sys_exit(128+4); // SIGILL
exitException = e;
}
return state != PAUSED;
}
- protected static String[] concatArgv(String argv0, String[] rest) {
- String[] argv = new String[rest.length+1];
- System.arraycopy(rest,0,argv,1,rest.length);
+ 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;
return argv;
}
start(args,env);
for(;;) {
if(execute()) break;
- System.err.println("WARNING: Pause requested while executing run()");
+ if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing run()");
}
- if(state == EXECED) System.err.println("WARNING: Process exec()ed while being run under run()");
+ if(state == EXECED && STDERR_DIAG) System.err.println("WARNING: Process exec()ed while being run under run()");
return state == EXITED ? exitStatus() : 0;
}
sp = top = writePages.length*(1<<pageShift);
try {
- sp = argsAddr = addStringArray(args,sp);
- sp = envAddr = addStringArray(createEnv(environ),sp);
+ sp = argsAddr = addStringArray(args,sp);
+ sp = envAddr = addStringArray(createEnv(environ),sp);
} catch(FaultException e) {
throw new IllegalArgumentException("args/environ too big");
}
sp &= ~15;
if(top - sp > ARG_MAX) throw new IllegalArgumentException("args/environ too big");
+ // HACK: heapStart() isn't always available when the constructor
+ // is run and this sometimes doesn't get initialized
+ if(heapEnd == 0) {
+ heapEnd = heapStart();
+ if(heapEnd == 0) throw new Error("heapEnd == 0");
+ int pageSize = writePages.length == 1 ? 4096 : (1<<pageShift);
+ heapEnd = (heapEnd + pageSize - 1) & ~(pageSize-1);
+ }
+
CPUState cpuState = new CPUState();
cpuState.r[A0] = argsAddr;
cpuState.r[A1] = envAddr;
state = PAUSED;
- _start();
+ _started();
}
/** Hook for subclasses to do their own startup */
- protected void _start() { /* noop */ }
+ 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");
+ if(args.length > 7) throw new IllegalArgumentException("args.length > 7");
+ CPUState state = new CPUState();
+ getCPUState(state);
+
+ int sp = state.r[SP];
+ int[] ia = new int[args.length];
+ for(int i=0;i<args.length;i++) {
+ Object o = args[i];
+ byte[] buf = null;
+ if(o instanceof String) {
+ buf = getBytes((String)o);
+ } else if(o instanceof byte[]) {
+ buf = (byte[]) o;
+ } else if(o instanceof Number) {
+ ia[i] = ((Number)o).intValue();
+ }
+ if(buf != null) {
+ sp -= buf.length;
+ copyout(buf,sp,buf.length);
+ ia[i] = sp;
+ }
+ }
+ int oldSP = state.r[SP];
+ if(oldSP == sp) return call(sym,ia);
+
+ state.r[SP] = sp;
+ setCPUState(state);
+ int ret = call(sym,ia);
+ state.r[SP] = oldSP;
+ setCPUState(state);
+ return ret;
+ }
- // FEATURE: call() that accepts an Object[] array and automatically allocates strings/arrays/etc on the stack
- public final int call(String sym) throws CallException { return call(sym,0,0,0,0,0,0,0); }
- public final int call(String sym, int a0) throws CallException { return call(sym,a0,0,0,0,0,0,0); }
- public final int call(String sym, int a0, int a1) throws CallException { return call(sym,a0,a1,0,0,0,0,0); }
- public final int call(String sym, int a0, int a1, int a2) throws CallException { return call(sym,a0,a1,a2,0,0,0,0); }
- public final int call(String sym, int a0, int a1, int a2, int a3) throws CallException { return call(sym,a0,a1,a2,a3,0,0,0); }
- public final int call(String sym, int a0, int a1, int a2, int a3, int a4) throws CallException { return call(sym,a0,a1,a2,a3,a4,0,0); }
- public final int call(String sym, int a0, int a1, int a2, int a3, int a4, int a5) throws CallException { return call(sym,a0,a1,a2,a3,a4,a5,0); }
+ public final int call(String sym) throws CallException { return call(sym,new int[]{}); }
+ public final int call(String sym, int a0) throws CallException { return call(sym,new int[]{a0}); }
+ public final int call(String sym, int a0, int a1) throws CallException { return call(sym,new int[]{a0,a1}); }
/** Calls a function in the process with the given arguments */
- public final int call(String sym, int a0, int a1, int a2, int a3, int a4, int a5, int a6) throws CallException {
+ public final int call(String sym, int[] args) throws CallException {
int func = lookupSymbol(sym);
if(func == -1) throw new CallException(sym + " not found");
int helper = lookupSymbol("_call_helper");
if(helper == -1) throw new CallException("_call_helper not found");
- return call(helper,func,a0,a1,a2,a3,a4,a5,a6);
+ return call(helper,func,args);
}
/** Executes the code at <i>addr</i> in the process setting A0-A3 and S0-S3 to the given arguments
and returns the contents of V1 when the the pause syscall is invoked */
- public final int call(int addr, int a0, int a1, int a2, int a3, int s0, int s1, int s2, int s3) {
+ //public final int call(int addr, int a0, int a1, int a2, int a3, int s0, int s1, int s2, int s3) {
+ public final int call(int addr, int a0, int[] rest) throws CallException {
+ if(rest.length > 7) throw new IllegalArgumentException("rest.length > 7");
if(state != PAUSED && state != CALLJAVA) throw new IllegalStateException("call() called in inappropriate state");
int oldState = state;
CPUState saved = new CPUState();
cpustate.r[SP] = cpustate.r[SP]&~15;
cpustate.r[RA] = 0xdeadbeef;
cpustate.r[A0] = a0;
- cpustate.r[A1] = a1;
- cpustate.r[A2] = a2;
- cpustate.r[A3] = a3;
- cpustate.r[S0] = s0;
- cpustate.r[S1] = s1;
- cpustate.r[S2] = s2;
- cpustate.r[S3] = s3;
+ switch(rest.length) {
+ case 7: cpustate.r[S3] = rest[6];
+ case 6: cpustate.r[S2] = rest[5];
+ case 5: cpustate.r[S1] = rest[4];
+ case 4: cpustate.r[S0] = rest[3];
+ case 3: cpustate.r[A3] = rest[2];
+ case 2: cpustate.r[A2] = rest[1];
+ case 1: cpustate.r[A1] = rest[0];
+ }
cpustate.pc = addr;
state = RUNNING;
getCPUState(cpustate);
setCPUState(saved);
- if(state != PAUSED)
- System.out.println("WARNING: Process exit()ed while servicing a call() request");
- else
- state = oldState;
+ if(state != PAUSED) throw new CallException("Process exit()ed while servicing a call() request");
+ state = oldState;
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) {
- int i;
- if(fdn < 0 || fdn >= OPEN_MAX) return -1;
- if(fds[fdn] == null) return -1;
- for(i=0;i<OPEN_MAX;i++) if(fds[i] == null) break;
+ public final int dupFD(int fdn) {
+ int i;
+ if(fdn < 0 || fdn >= OPEN_MAX) return -1;
+ if(fds[fdn] == null) return -1;
+ for(i=0;i<OPEN_MAX;i++) if(fds[i] == null) break;
if(i==OPEN_MAX) return -1;
fds[i] = fds[fdn].dup();
return i;
}
- // FEATURE: These should be pulled in from UsermodeConstants but fcntl.h is hard to parse
public static final int RD_ONLY = 0;
public static final int WR_ONLY = 1;
public static final int RDWR = 2;
public static final int O_APPEND = 0x0008;
public static final int O_TRUNC = 0x0400;
public static final int O_NONBLOCK = 0x4000;
+ public static final int O_NOCTTY = 0x8000;
- // FEATURE: Lots of duplicate code between this and UnixRuntime.HostFS.open()
- protected FD open(String path, int flags, int mode) throws IOException {
- final File f = new File(path);
- // NOTE: createNewFile is a Java2 function
- if((flags & (O_EXCL|O_CREAT)) == (O_EXCL|O_CREAT))
- if(!f.createNewFile()) throw new ErrnoException(EEXIST);
- if(!f.exists() && (flags&O_CREAT) == 0) return null;
- if(f.isDirectory()) return null;
- final Seekable.File sf = new Seekable.File(path,mode!=RD_ONLY);
- if((flags&O_TRUNC)!=0) sf.setLength(0);
- return new SeekableFD(sf,flags) {
- protected FStat _fstat() { return new HostFStat(f) {
- public int size() {
- try { return sf.length(); } catch(IOException e) { return 0; }
- }
- };}
- };
- }
- /** The open syscall */
- private int sys_open(int addr, int flags, int mode) {
- if((flags & O_NONBLOCK) != 0) {
- System.err.println("WARNING: O_NONBLOCK not supported");
- return -EOPNOTSUPP;
+ 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) {
+ if(STDERR_DIAG)
+ System.err.println("WARNING: Unsupported flags passed to open(\"" + f + "\"): " + toHex(flags & ~(3|O_CREAT|O_EXCL|O_APPEND|O_TRUNC)));
+
+ throw new ErrnoException(ENOTSUP);
}
+ boolean write = (flags&3) != RD_ONLY;
- try {
- FD fd = open(cstring(addr),flags,mode);
- if(fd == null) return -ENOENT;
- int fdn = addFD(fd);
- if(fdn == -1) {
- fd.close();
- return -ENFILE;
+ if(sm != null && !(write ? sm.allowWrite(f) : sm.allowRead(f))) throw new ErrnoException(EACCES);
+
+ if((flags & (O_EXCL|O_CREAT)) == (O_EXCL|O_CREAT)) {
+ try {
+ // NOTE: createNewFile is a Java2 function
+ if(!f.createNewFile()) throw new ErrnoException(EEXIST);
+ } catch(IOException e) {
+ throw new ErrnoException(EIO);
}
- return fdn;
+ } else if(!f.exists()) {
+ if((flags&O_CREAT)==0) return null;
+ } else if(f.isDirectory()) {
+ return hostFSDirFD(f,data);
}
- catch(ErrnoException e) { return -e.errno; }
- catch(FileNotFoundException e) {
- if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) return -EACCES;
- return -ENOENT;
- }
- catch(IOException e) { return -EIO; }
- catch(FaultException e) { return -EFAULT; }
+
+ final Seekable.File sf;
+ try {
+ sf = new Seekable.File(f,write);
+ } catch(FileNotFoundException e) {
+ if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) throw new ErrnoException(EACCES);
+ return null;
+ } catch(IOException e) { throw new ErrnoException(EIO); }
+
+ return new SeekableFD(sf,flags) { protected FStat _fstat() { return hostFStat(f,data); } };
+ }
+
+ 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,null);
+ }
+
+ /** The open syscall */
+ private int sys_open(int addr, int flags, int mode) throws ErrnoException, FaultException {
+ flags &= ~O_NOCTTY; // this is meaningless under nestedvm
+ FD fd = _open(cstring(addr),flags,mode);
+ if(fd == null) return -ENOENT;
+ int fdn = addFD(fd);
+ if(fdn == -1) { fd.close(); return -ENFILE; }
+ return fdn;
}
/** The write syscall */
- private int sys_write(int fdn, int addr, int count) {
+
+ 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;
+ if(fds[fdn] == null) return -EBADFD;
+ byte[] buf = byteBuf(count);
+ copyin(addr,buf,count);
try {
- byte[] buf = byteBuf(count);
- copyin(addr,buf,count);
return fds[fdn].write(buf,0,count);
- } catch(FaultException e) {
- System.err.println(e);
- return -EFAULT;
- } catch(IOException e) {
- // FEATURE: We should support signals and send a SIGPIPE
- if(e.getMessage().equals("Pipe closed")) return sys_exit(128+13);
- System.err.println(e);
- return -EIO;
+ } catch(ErrnoException e) {
+ if(e.errno == EPIPE) sys_exit(128+13);
+ throw e;
}
}
/** The read syscall */
- private int sys_read(int fdn, int addr, int count) {
+ 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(FaultException e) {
- System.err.println(e);
- return -EFAULT;
- } catch(IOException e) {
- System.err.println(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 */
- int stat(FStat fs, int addr) {
- try {
- memWrite(addr+0,(fs.dev()<<16)|(fs.inode()&0xffff)); // st_dev (top 16), // st_ino (bottom 16)
- memWrite(addr+4,((fs.type()&0xf000))|(fs.mode()&0xfff)); // st_mode
- memWrite(addr+8,1<<16); // st_nlink (top 16) // st_uid (bottom 16)
- memWrite(addr+12,0); // st_gid (top 16) // st_rdev (bottom 16)
- memWrite(addr+16,fs.size()); // st_size
- memWrite(addr+20,fs.atime()); // st_atime
- // memWrite(addr+24,0) // st_spare1
- memWrite(addr+28,fs.mtime()); // st_mtime
- // memWrite(addr+32,0) // st_spare2
- memWrite(addr+36,fs.ctime()); // st_ctime
- // memWrite(addr+40,0) // st_spare3
- memWrite(addr+44,fs.blksize()); // st_bklsize;
- memWrite(addr+48,fs.blocks()); // st_blocks
- // memWrite(addr+52,0) // st_spare4[0]
- // memWrite(addr+56,0) // st_spare4[1]
- } catch(FaultException e) {
- System.err.println(e);
- return -EFAULT;
- }
+ int stat(FStat fs, int addr) throws FaultException {
+ memWrite(addr+0,(fs.dev()<<16)|(fs.inode()&0xffff)); // st_dev (top 16), // st_ino (bottom 16)
+ memWrite(addr+4,((fs.type()&0xf000))|(fs.mode()&0xfff)); // st_mode
+ memWrite(addr+8,1<<16); // st_nlink (top 16) // st_uid (bottom 16)
+ memWrite(addr+12,0); // st_gid (top 16) // st_rdev (bottom 16)
+ memWrite(addr+16,fs.size()); // st_size
+ memWrite(addr+20,fs.atime()); // st_atime
+ // memWrite(addr+24,0) // st_spare1
+ memWrite(addr+28,fs.mtime()); // st_mtime
+ // memWrite(addr+32,0) // st_spare2
+ memWrite(addr+36,fs.ctime()); // st_ctime
+ // memWrite(addr+40,0) // st_spare3
+ memWrite(addr+44,fs.blksize()); // st_bklsize;
+ memWrite(addr+48,fs.blocks()); // st_blocks
+ // memWrite(addr+52,0) // st_spare4[0]
+ // memWrite(addr+56,0) // st_spare4[1]
return 0;
}
/** The fstat syscall */
- private int sys_fstat(int fdn, int addr) {
+ private int sys_fstat(int fdn, int addr) throws FaultException {
if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
if(fds[fdn] == null) return -EBADFD;
return stat(fds[fdn].fstat(),addr);
long tv_usec;
};
*/
- private int sys_gettimeofday(int timevalAddr, int timezoneAddr) {
+ private int sys_gettimeofday(int timevalAddr, int timezoneAddr) throws FaultException {
long now = System.currentTimeMillis();
int tv_sec = (int)(now / 1000);
int tv_usec = (int)((now%1000)*1000);
- try {
- memWrite(timevalAddr+0,tv_sec);
- memWrite(timevalAddr+4,tv_usec);
- return 0;
- } catch(FaultException e) {
- return -EFAULT;
- }
+ memWrite(timevalAddr+0,tv_sec);
+ memWrite(timevalAddr+4,tv_usec);
+ return 0;
}
private int sys_sleep(int sec) {
private int sys_sysconf(int n) {
switch(n) {
case _SC_CLK_TCK: return 1000;
+ case _SC_PAGESIZE: return writePages.length == 1 ? 4096 : (1<<pageShift);
+ case _SC_PHYS_PAGES: return writePages.length == 1 ? (1<<pageShift)/4096 : writePages.length;
default:
- System.err.println("WARNING: Attempted to use unknown sysconf key: " + n);
+ if(STDERR_DIAG) System.err.println("WARNING: Attempted to use unknown sysconf key: " + n);
return -EINVAL;
}
}
/** 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;
try {
for(int i=start;i<end;i++) readPages[i] = writePages[i] = new int[pageWords];
} catch(OutOfMemoryError e) {
- System.err.println("WARNING: Caught OOM Exception in sbrk: " + e);
+ if(STDERR_DIAG) System.err.println("WARNING: Caught OOM Exception in sbrk: " + e);
return -ENOMEM;
}
}
/** 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); }
if(state != RUNNING) throw new IllegalStateException("wound up calling sys_calljava while not in RUNNING");
if(callJavaCB != null) {
state = CALLJAVA;
- int ret = callJavaCB.call(a,b,c,d);
+ int ret;
+ try {
+ ret = callJavaCB.call(a,b,c,d);
+ } catch(RuntimeException e) {
+ System.err.println("Error while executing callJavaCB");
+ e.printStackTrace();
+ ret = 0;
+ }
state = RUNNING;
return ret;
} else {
- System.err.println("WARNING: calljava syscall invoked without a calljava callback set");
- return 0;
+ if(STDERR_DIAG) System.err.println("WARNING: calljava syscall invoked without a calljava callback set");
+ return 0;
}
}
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 */
+ void _exited() { }
- /** Hook for subclasses to do something when the process exits (MUST set state = EXITED) */
- protected void _exit() { state = EXITED; }
private int sys_exit(int status) {
exitStatus = status;
for(int i=0;i<fds.length;i++) if(fds[i] != null) closeFD(i);
- _exit();
+ state = EXITED;
+ _exited();
return 0;
}
private int sys_fcntl(int fdn, int cmd, int arg) {
- // FEATURE: Pull these from fcntl.h
- final int F_DUPFD = 0;
- final int F_GETFD = 1;
- final int F_SETFD = 2;
- final int F_GETFL = 3;
int i;
if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
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;
+ closeOnExec[fdn] = arg != 0;
return 0;
case F_GETFD:
return closeOnExec[fdn] ? 1 : 0;
default:
- System.err.println("WARNING: Unknown fcntl command: " + cmd);
+ if(STDERR_DIAG) System.err.println("WARNING: Unknown fcntl command: " + cmd);
return -ENOSYS;
}
}
<i>syscall</i> should be the contents of V0 and <i>a</i>, <i>b</i>, <i>c</i>, and <i>d</i> should be
the contenst of A0, A1, A2, and A3. The call MAY change the state
@see Runtime#state state */
- protected int syscall(int syscall, int a, int b, int c, int d) {
+ protected final int syscall(int syscall, int a, int b, int c, int d) {
+ try {
+ return _syscall(syscall,a,b,c,d);
+ } catch(ErrnoException e) {
+ return -e.errno;
+ } catch(FaultException e) {
+ return -EFAULT;
+ } catch(RuntimeException e) {
+ e.printStackTrace();
+ throw new Error("Internal Error in _syscall()");
+ }
+ }
+
+ int _syscall(int syscall, int a, int b, int c, int d) throws ErrnoException, FaultException {
switch(syscall) {
case SYS_null: return 0;
case SYS_exit: return sys_exit(a);
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:
case SYS_mkdir:
case SYS_getcwd:
case SYS_chdir:
- System.err.println("Attempted to use a UnixRuntime syscall in Runtime (" + syscall + ")");
+ if(STDERR_DIAG) System.err.println("Attempted to use a UnixRuntime syscall in Runtime (" + syscall + ")");
return -ENOSYS;
default:
- System.err.println("Attempted to use unknown syscall: " + syscall);
+ if(STDERR_DIAG) System.err.println("Attempted to use unknown syscall: " + syscall);
return -ENOSYS;
}
}
}
/** 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; }
- /** 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; }
+ 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; }
private FStat cachedFStat = null;
public final FStat 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; }
- 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;
+ Seekable seekable() { return data; }
+
+ 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;
- boolean _executable = false;
- // FEATURE: This might be too expensive
- try {
- FileInputStream fis = new FileInputStream(f);
- switch(fis.read()) {
- case '\177': _executable = fis.read() == 'E' && fis.read() == 'L' && fis.read() == 'F'; break;
- case '#': _executable = fis.read() == '!';
- }
- fis.close();
- } catch(IOException e) { /* ignore */ }
- 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); }
+ 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)";
public CallException(String s) { super(s); }
}
- protected static class ErrnoException extends IOException {
+ protected static class ErrnoException extends Exception {
public int errno;
public ErrnoException(int errno) { super("Errno: " + errno); this.errno = errno; }
}
public int pc;
public CPUState dup() {
- CPUState c = new CPUState();
+ CPUState c = new CPUState();
c.hi = hi;
c.lo = lo;
c.fcsr = fcsr;
c.pc = pc;
for(int i=0;i<32;i++) {
- c.r[i] = r[i];
+ c.r[i] = r[i];
c.f[i] = f[i];
}
return c;
}
}
+ public static class SecurityManager {
+ public boolean allowRead(File f) { return true; }
+ public boolean allowWrite(File f) { return true; }
+ public boolean allowStat(File f) { return true; }
+ }
+
// Null pointer check helper function
protected final void nullPointerCheck(int addr) throws ExecutionException {
if(addr < 65536)
}
// 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) {
}
}
- /** Decode an packed string.. FEATURE: document this better */
+ /** Decode a packed string */
protected static final int[] decodeData(String s, int words) {
if(s.length() % 8 != 0) throw new IllegalArgumentException("string length must be a multiple of 8");
if((s.length() / 8) * 7 < words*4) throw new IllegalArgumentException("string isn't big enough");
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