1 // Copyright 2000-2005 the Contributors, as shown in the revision logs.
2 // Licensed under the Apache Public Source License 2.0 ("the License").
3 // You may not use this file except in compliance with the License.
5 // Copyright 2003 Brian Alliet
6 // Based on org.xwt.imp.MIPS by Adam Megacz
7 // Portions Copyright 2003 Adam Megacz
9 package org.ibex.nestedvm;
11 import org.ibex.nestedvm.util.*;
14 public abstract class Runtime implements UsermodeConstants,Registers,Cloneable {
15 public static final String VERSION = "1.0";
17 /** True to write useful diagnostic information to stderr when things go wrong */
18 final static boolean STDERR_DIAG = true;
20 /** Number of bits to shift to get the page number (1<<<pageShift == pageSize) */
21 protected final int pageShift;
22 /** Bottom of region of memory allocated to the stack */
23 private final int stackBottom;
25 /** Readable main memory pages */
26 protected int[][] readPages;
27 /** Writable main memory pages.
28 If the page is writable writePages[x] == readPages[x]; if not writePages[x] == null. */
29 protected int[][] writePages;
31 /** The address of the end of the heap */
34 /** Number of guard pages to keep between the stack and the heap */
35 private static final int STACK_GUARD_PAGES = 4;
37 /** The last address the executable uses (other than the heap/stack) */
38 protected abstract int heapStart();
40 /** The program's entry point */
41 protected abstract int entryPoint();
43 /** The location of the _user_info block (or 0 is there is none) */
44 protected int userInfoBase() { return 0; }
45 protected int userInfoSize() { return 0; }
47 /** The location of the global pointer */
48 protected abstract int gp();
50 /** When the process started */
51 private long startTime;
53 /** Program is executing instructions */
54 public final static int RUNNING = 0; // Horrible things will happen if this isn't 0
55 /** Text/Data loaded in memory */
56 public final static int STOPPED = 1;
57 /** Prgram has been started but is paused */
58 public final static int PAUSED = 2;
59 /** Program is executing a callJava() method */
60 public final static int CALLJAVA = 3;
61 /** Program has exited (it cannot currently be restarted) */
62 public final static int EXITED = 4;
63 /** Program has executed a successful exec(), a new Runtime needs to be run (used by UnixRuntime) */
64 public final static int EXECED = 5;
66 /** The current state */
67 protected int state = STOPPED;
68 /** @see Runtime#state state */
69 public final int getState() { return state; }
71 /** The exit status if the process (only valid if state==DONE)
73 private int exitStatus;
74 public ExecutionException exitException;
76 /** Table containing all open file descriptors. (Entries are null if the fd is not in use */
77 FD[] fds; // package-private for UnixRuntime
78 boolean closeOnExec[];
80 /** Table of all current file locks held by this process. */
81 Seekable.Lock[] locks;
82 public static final int LOCK_MAX = 8;
84 /** Pointer to a SecurityManager for this process */
86 public void setSecurityManager(SecurityManager sm) { this.sm = sm; }
88 /** Pointer to a callback for the call_java syscall */
89 private CallJavaCB callJavaCB;
90 public void setCallJavaCB(CallJavaCB callJavaCB) { this.callJavaCB = callJavaCB; }
92 /** Temporary buffer for read/write operations */
93 private byte[] _byteBuf;
94 /** Max size of temporary buffer
95 @see Runtime#_byteBuf */
96 final static int MAX_CHUNK = 16*1024*1024 - 1024;
98 /** Subclasses should actually execute program in this method. They should continue
99 executing until state != RUNNING. Only syscall() can modify state. It is safe
100 to only check the state attribute after a call to syscall() */
101 protected abstract void _execute() throws ExecutionException;
103 /** Subclasses should return the address of the symbol <i>symbol</i> or -1 it it doesn't exits in this method
104 This method is only required if the call() function is used */
105 protected int lookupSymbol(String symbol) { return -1; }
107 /** Subclasses should populate a CPUState object representing the cpu state */
108 protected abstract void getCPUState(CPUState state);
110 /** Subclasses should set the CPUState to the state held in <i>state</i> */
111 protected abstract void setCPUState(CPUState state);
113 /** True to enabled a few hacks to better support the win32 console */
114 final static boolean win32Hacks;
117 String os = Platform.getProperty("os.name");
118 String prop = Platform.getProperty("nestedvm.win32hacks");
119 if(prop != null) { win32Hacks = Boolean.valueOf(prop).booleanValue(); }
120 else { win32Hacks = os != null && os.toLowerCase().indexOf("windows") != -1; }
123 protected Object clone() throws CloneNotSupportedException {
124 Runtime r = (Runtime) super.clone();
127 r.fds = new FD[OPEN_MAX];
128 for(int i=0;i<OPEN_MAX;i++) if(fds[i] != null) r.fds[i] = fds[i].dup();
129 r.locks = new Seekable.Lock[LOCK_MAX];
130 int totalPages = writePages.length;
131 r.readPages = new int[totalPages][];
132 r.writePages = new int[totalPages][];
133 for(int i=0;i<totalPages;i++) {
134 if(readPages[i] == null) continue;
135 if(writePages[i] == null) r.readPages[i] = readPages[i];
136 else r.readPages[i] = r.writePages[i] = (int[])writePages[i].clone();
141 protected Runtime(int pageSize, int totalPages) { this(pageSize, totalPages,false); }
142 protected Runtime(int pageSize, int totalPages, boolean exec) {
143 if(pageSize <= 0) throw new IllegalArgumentException("pageSize <= 0");
144 if(totalPages <= 0) throw new IllegalArgumentException("totalPages <= 0");
145 if((pageSize&(pageSize-1)) != 0) throw new IllegalArgumentException("pageSize not a power of two");
148 while(pageSize>>>_pageShift != 1) _pageShift++;
149 pageShift = _pageShift;
151 int heapStart = heapStart();
152 int totalMemory = totalPages * pageSize;
153 int stackSize = max(totalMemory/512,ARG_MAX+65536);
156 stackSize = max(stackSize,pageSize);
157 stackSize = (stackSize + pageSize - 1) & ~(pageSize-1);
158 stackPages = stackSize >>> pageShift;
159 heapStart = (heapStart + pageSize - 1) & ~(pageSize-1);
160 if(stackPages + STACK_GUARD_PAGES + (heapStart >>> pageShift) >= totalPages)
161 throw new IllegalArgumentException("total pages too small");
163 if(pageSize < heapStart + stackSize) throw new IllegalArgumentException("total memory too small");
164 heapStart = (heapStart + 4095) & ~4096;
167 stackBottom = totalMemory - stackSize;
170 readPages = new int[totalPages][];
171 writePages = new int[totalPages][];
173 if(totalPages == 1) {
174 readPages[0] = writePages[0] = new int[pageSize>>2];
176 for(int i=(stackBottom >>> pageShift);i<writePages.length;i++) {
177 readPages[i] = writePages[i] = new int[pageSize>>2];
182 fds = new FD[OPEN_MAX];
183 closeOnExec = new boolean[OPEN_MAX];
184 locks = new Seekable.Lock[LOCK_MAX];
186 InputStream stdin = win32Hacks ? new Win32ConsoleIS(System.in) : System.in;
187 addFD(new TerminalFD(stdin));
188 addFD(new TerminalFD(System.out));
189 addFD(new TerminalFD(System.err));
193 /** Copy everything from <i>src</i> to <i>addr</i> initializing uninitialized pages if required.
194 Newly initalized pages will be marked read-only if <i>ro</i> is set */
195 protected final void initPages(int[] src, int addr, boolean ro) {
196 int pageWords = (1<<pageShift)>>>2;
197 int pageMask = (1<<pageShift) - 1;
199 for(int i=0;i<src.length;) {
200 int page = addr >>> pageShift;
201 int start = (addr&pageMask)>>2;
202 int elements = min(pageWords-start,src.length-i);
203 if(readPages[page]==null) {
206 if(writePages[page] == null) writePages[page] = readPages[page];
208 System.arraycopy(src,i,readPages[page],start,elements);
214 /** Initialize <i>words</i> of pages starting at <i>addr</i> to 0 */
215 protected final void clearPages(int addr, int words) {
216 int pageWords = (1<<pageShift)>>>2;
217 int pageMask = (1<<pageShift) - 1;
219 for(int i=0;i<words;) {
220 int page = addr >>> pageShift;
221 int start = (addr&pageMask)>>2;
222 int elements = min(pageWords-start,words-i);
223 if(readPages[page]==null) {
224 readPages[page] = writePages[page] = new int[pageWords];
226 if(writePages[page] == null) writePages[page] = readPages[page];
227 for(int j=start;j<start+elements;j++) writePages[page][j] = 0;
234 /** Copies <i>length</i> bytes from the processes memory space starting at
235 <i>addr</i> INTO a java byte array <i>a</i> */
236 public final void copyin(int addr, byte[] buf, int count) throws ReadFaultException {
237 int pageWords = (1<<pageShift)>>>2;
238 int pageMask = pageWords - 1;
241 if(count == 0) return;
243 int word = memRead(addr&~3);
245 case 1: buf[x++] = (byte)((word>>>16)&0xff); if(--count==0) break;
246 case 2: buf[x++] = (byte)((word>>> 8)&0xff); if(--count==0) break;
247 case 3: buf[x++] = (byte)((word>>> 0)&0xff); if(--count==0) break;
251 if((count&~3) != 0) {
255 int[] page = readPages[a >>> (pageShift-2)];
256 if(page == null) throw new ReadFaultException(a<<2);
257 int index = a&pageMask;
258 int n = min(c,pageWords-index);
259 for(int i=0;i<n;i++,x+=4) {
260 int word = page[index+i];
261 buf[x+0] = (byte)((word>>>24)&0xff); buf[x+1] = (byte)((word>>>16)&0xff);
262 buf[x+2] = (byte)((word>>> 8)&0xff); buf[x+3] = (byte)((word>>> 0)&0xff);
266 addr = a<<2; count &=3;
269 int word = memRead(addr);
271 case 3: buf[x+2] = (byte)((word>>>8)&0xff);
272 case 2: buf[x+1] = (byte)((word>>>16)&0xff);
273 case 1: buf[x+0] = (byte)((word>>>24)&0xff);
278 /** Copies <i>length</i> bytes OUT OF the java array <i>a</i> into the processes memory
279 space at <i>addr</i> */
280 public final void copyout(byte[] buf, int addr, int count) throws FaultException {
281 int pageWords = (1<<pageShift)>>>2;
282 int pageWordMask = pageWords - 1;
285 if(count == 0) return;
287 int word = memRead(addr&~3);
289 case 1: word = (word&0xff00ffff)|((buf[x++]&0xff)<<16); if(--count==0) break;
290 case 2: word = (word&0xffff00ff)|((buf[x++]&0xff)<< 8); if(--count==0) break;
291 case 3: word = (word&0xffffff00)|((buf[x++]&0xff)<< 0); if(--count==0) break;
293 memWrite(addr&~3,word);
297 if((count&~3) != 0) {
301 int[] page = writePages[a >>> (pageShift-2)];
302 if(page == null) throw new WriteFaultException(a<<2);
303 int index = a&pageWordMask;
304 int n = min(c,pageWords-index);
305 for(int i=0;i<n;i++,x+=4)
306 page[index+i] = ((buf[x+0]&0xff)<<24)|((buf[x+1]&0xff)<<16)|((buf[x+2]&0xff)<<8)|((buf[x+3]&0xff)<<0);
309 addr = a<<2; count&=3;
313 int word = memRead(addr);
315 case 1: word = (word&0x00ffffff)|((buf[x+0]&0xff)<<24); break;
316 case 2: word = (word&0x0000ffff)|((buf[x+0]&0xff)<<24)|((buf[x+1]&0xff)<<16); break;
317 case 3: word = (word&0x000000ff)|((buf[x+0]&0xff)<<24)|((buf[x+1]&0xff)<<16)|((buf[x+2]&0xff)<<8); break;
323 public final void memcpy(int dst, int src, int count) throws FaultException {
324 int pageWords = (1<<pageShift)>>>2;
325 int pageWordMask = pageWords - 1;
326 if((dst&3) == 0 && (src&3)==0) {
327 if((count&~3) != 0) {
332 int[] srcPage = readPages[s>>>(pageShift-2)];
333 if(srcPage == null) throw new ReadFaultException(s<<2);
334 int[] dstPage = writePages[d>>>(pageShift-2)];
335 if(dstPage == null) throw new WriteFaultException(d<<2);
336 int srcIndex = s&pageWordMask;
337 int dstIndex = d&pageWordMask;
338 int n = min(c,pageWords-max(srcIndex,dstIndex));
339 System.arraycopy(srcPage,srcIndex,dstPage,dstIndex,n);
340 s += n; d += n; c -= n;
342 src = s<<2; dst = d<<2; count&=3;
345 int word1 = memRead(src);
346 int word2 = memRead(dst);
348 case 1: memWrite(dst,(word1&0xff000000)|(word2&0x00ffffff)); break;
349 case 2: memWrite(dst,(word1&0xffff0000)|(word2&0x0000ffff)); break;
350 case 3: memWrite(dst,(word1&0xffffff00)|(word2&0x000000ff)); break;
355 int n = min(count,MAX_CHUNK);
356 byte[] buf = byteBuf(n);
359 count -= n; src += n; dst += n;
364 public final void memset(int addr, int ch, int count) throws FaultException {
365 int pageWords = (1<<pageShift)>>>2;
366 int pageWordMask = pageWords - 1;
368 int fourBytes = ((ch&0xff)<<24)|((ch&0xff)<<16)|((ch&0xff)<<8)|((ch&0xff)<<0);
370 int word = memRead(addr&~3);
372 case 1: word = (word&0xff00ffff)|((ch&0xff)<<16); if(--count==0) break;
373 case 2: word = (word&0xffff00ff)|((ch&0xff)<< 8); if(--count==0) break;
374 case 3: word = (word&0xffffff00)|((ch&0xff)<< 0); if(--count==0) break;
376 memWrite(addr&~3,word);
379 if((count&~3) != 0) {
383 int[] page = readPages[a>>>(pageShift-2)];
384 if(page == null) throw new WriteFaultException(a<<2);
385 int index = a&pageWordMask;
386 int n = min(c,pageWords-index);
387 /* Arrays.fill(page,index,index+n,fourBytes);*/
388 for(int i=index;i<index+n;i++) page[i] = fourBytes;
391 addr = a<<2; count&=3;
394 int word = memRead(addr);
396 case 1: word = (word&0x00ffffff)|(fourBytes&0xff000000); break;
397 case 2: word = (word&0x0000ffff)|(fourBytes&0xffff0000); break;
398 case 3: word = (word&0x000000ff)|(fourBytes&0xffffff00); break;
404 /** Read a word from the processes memory at <i>addr</i> */
405 public final int memRead(int addr) throws ReadFaultException {
406 if((addr & 3) != 0) throw new ReadFaultException(addr);
407 return unsafeMemRead(addr);
410 protected final int unsafeMemRead(int addr) throws ReadFaultException {
411 int page = addr >>> pageShift;
412 int entry = (addr&(1<<pageShift) - 1)>>2;
414 return readPages[page][entry];
415 } catch(ArrayIndexOutOfBoundsException e) {
416 if(page < 0 || page >= readPages.length) throw new ReadFaultException(addr);
417 throw e; // should never happen
418 } catch(NullPointerException e) {
419 throw new ReadFaultException(addr);
423 /** Writes a word to the processes memory at <i>addr</i> */
424 public final void memWrite(int addr, int value) throws WriteFaultException {
425 if((addr & 3) != 0) throw new WriteFaultException(addr);
426 unsafeMemWrite(addr,value);
429 protected final void unsafeMemWrite(int addr, int value) throws WriteFaultException {
430 int page = addr >>> pageShift;
431 int entry = (addr&(1<<pageShift) - 1)>>2;
433 writePages[page][entry] = value;
434 } catch(ArrayIndexOutOfBoundsException e) {
435 if(page < 0 || page >= writePages.length) throw new WriteFaultException(addr);
436 throw e; // should never happen
437 } catch(NullPointerException e) {
438 throw new WriteFaultException(addr);
442 /** Created a new non-empty writable page at page number <i>page</i> */
443 private final int[] initPage(int page) { return initPage(page,false); }
444 /** Created a new non-empty page at page number <i>page</i>. If <i>ro</i> is set the page will be read-only */
445 private final int[] initPage(int page, boolean ro) {
446 int[] buf = new int[(1<<pageShift)>>>2];
447 writePages[page] = ro ? null : buf;
448 readPages[page] = buf;
452 /** Returns the exit status of the process. (only valid if state == DONE)
453 @see Runtime#state */
454 public final int exitStatus() {
455 if(state != EXITED) throw new IllegalStateException("exitStatus() called in an inappropriate state");
459 private int addStringArray(String[] strings, int topAddr) throws FaultException {
460 int count = strings.length;
461 int total = 0; /* null last table entry */
462 for(int i=0;i<count;i++) total += strings[i].length() + 1;
463 total += (count+1)*4;
464 int start = (topAddr - total)&~3;
465 int addr = start + (count+1)*4;
466 int[] table = new int[count+1];
468 for(int i=0;i<count;i++) {
469 byte[] a = getBytes(strings[i]);
471 copyout(a,addr,a.length);
472 memset(addr+a.length,0,1);
473 addr += a.length + 1;
476 for(int i=0;i<count+1;i++) {
477 memWrite(addr,table[i]);
480 } catch(FaultException e) {
481 throw new RuntimeException(e.toString());
486 String[] createEnv(String[] extra) { if(extra == null) extra = new String[0]; return extra; }
488 /** Sets word number <i>index</i> in the _user_info table to <i>word</i>
489 * The user_info table is a chunk of memory in the program's memory defined by the
490 * symbol "user_info". The compiler/interpreter automatically determine the size
491 * and location of the user_info table from the ELF symbol table. setUserInfo and
492 * getUserInfo are used to modify the words in the user_info table. */
493 public void setUserInfo(int index, int word) {
494 if(index < 0 || index >= userInfoSize()/4) throw new IndexOutOfBoundsException("setUserInfo called with index >= " + (userInfoSize()/4));
496 memWrite(userInfoBase()+index*4,word);
497 } catch(FaultException e) { throw new RuntimeException(e.toString()); }
500 /** Returns the word in the _user_info table entry <i>index</i>
501 @see Runtime#setUserInfo(int,int) setUserInfo */
502 public int getUserInfo(int index) {
503 if(index < 0 || index >= userInfoSize()/4) throw new IndexOutOfBoundsException("setUserInfo called with index >= " + (userInfoSize()/4));
505 return memRead(userInfoBase()+index*4);
506 } catch(FaultException e) { throw new RuntimeException(e.toString()); }
509 /** Calls _execute() (subclass's execute()) and catches exceptions */
510 private void __execute() {
513 } catch(FaultException e) {
514 if(STDERR_DIAG) e.printStackTrace();
515 exit(128+11,true); // SIGSEGV
517 } catch(ExecutionException e) {
518 if(STDERR_DIAG) e.printStackTrace();
519 exit(128+4,true); // SIGILL
524 /** Executes the process until the PAUSE syscall is invoked or the process exits. Returns true if the process exited. */
525 public final boolean execute() {
526 if(state != PAUSED) throw new IllegalStateException("execute() called in inappropriate state");
527 if(startTime == 0) startTime = System.currentTimeMillis();
530 if(state != PAUSED && state != EXITED && state != EXECED)
531 throw new IllegalStateException("execute() ended up in an inappropriate state (" + state + ")");
532 return state != PAUSED;
535 static String[] concatArgv(String argv0, String[] rest) {
536 String[] argv = new String[rest.length+1];
537 System.arraycopy(rest,0,argv,1,rest.length);
542 public final int run() { return run(null); }
543 public final int run(String argv0, String[] rest) { return run(concatArgv(argv0,rest)); }
544 public final int run(String[] args) { return run(args,null); }
546 /** Runs the process until it exits and returns the exit status.
547 If the process executes the PAUSE syscall execution will be paused for 500ms and a warning will be displayed */
548 public final int run(String[] args, String[] env) {
552 if(STDERR_DIAG) System.err.println("WARNING: Pause requested while executing run()");
554 if(state == EXECED && STDERR_DIAG) System.err.println("WARNING: Process exec()ed while being run under run()");
555 return state == EXITED ? exitStatus() : 0;
558 public final void start() { start(null); }
559 public final void start(String[] args) { start(args,null); }
561 /** Initializes the process and prepairs it to be executed with execute() */
562 public final void start(String[] args, String[] environ) {
563 int top, sp, argsAddr, envAddr;
564 if(state != STOPPED) throw new IllegalStateException("start() called in inappropriate state");
565 if(args == null) args = new String[]{getClass().getName()};
567 sp = top = writePages.length*(1<<pageShift);
569 sp = argsAddr = addStringArray(args,sp);
570 sp = envAddr = addStringArray(createEnv(environ),sp);
571 } catch(FaultException e) {
572 throw new IllegalArgumentException("args/environ too big");
575 if(top - sp > ARG_MAX) throw new IllegalArgumentException("args/environ too big");
577 // HACK: heapStart() isn't always available when the constructor
578 // is run and this sometimes doesn't get initialized
580 heapEnd = heapStart();
581 if(heapEnd == 0) throw new Error("heapEnd == 0");
582 int pageSize = writePages.length == 1 ? 4096 : (1<<pageShift);
583 heapEnd = (heapEnd + pageSize - 1) & ~(pageSize-1);
586 CPUState cpuState = new CPUState();
587 cpuState.r[A0] = argsAddr;
588 cpuState.r[A1] = envAddr;
590 cpuState.r[RA] = 0xdeadbeef;
591 cpuState.r[GP] = gp();
592 cpuState.pc = entryPoint();
593 setCPUState(cpuState);
600 /** Hook for subclasses to do their own startup */
603 public final int call(String sym, Object[] args) throws CallException, FaultException {
604 if(state != PAUSED && state != CALLJAVA) throw new IllegalStateException("call() called in inappropriate state");
605 if(args.length > 7) throw new IllegalArgumentException("args.length > 7");
606 CPUState state = new CPUState();
609 int sp = state.r[SP];
610 int[] ia = new int[args.length];
611 for(int i=0;i<args.length;i++) {
614 if(o instanceof String) {
615 buf = getBytes((String)o);
616 } else if(o instanceof byte[]) {
618 } else if(o instanceof Number) {
619 ia[i] = ((Number)o).intValue();
623 copyout(buf,sp,buf.length);
627 int oldSP = state.r[SP];
628 if(oldSP == sp) return call(sym,ia);
632 int ret = call(sym,ia);
638 public final int call(String sym) throws CallException { return call(sym,new int[]{}); }
639 public final int call(String sym, int a0) throws CallException { return call(sym,new int[]{a0}); }
640 public final int call(String sym, int a0, int a1) throws CallException { return call(sym,new int[]{a0,a1}); }
642 /** Calls a function in the process with the given arguments */
643 public final int call(String sym, int[] args) throws CallException {
644 int func = lookupSymbol(sym);
645 if(func == -1) throw new CallException(sym + " not found");
646 int helper = lookupSymbol("_call_helper");
647 if(helper == -1) throw new CallException("_call_helper not found");
648 return call(helper,func,args);
651 /** Executes the code at <i>addr</i> in the process setting A0-A3 and S0-S3 to the given arguments
652 and returns the contents of V1 when the the pause syscall is invoked */
653 //public final int call(int addr, int a0, int a1, int a2, int a3, int s0, int s1, int s2, int s3) {
654 public final int call(int addr, int a0, int[] rest) throws CallException {
655 if(rest.length > 7) throw new IllegalArgumentException("rest.length > 7");
656 if(state != PAUSED && state != CALLJAVA) throw new IllegalStateException("call() called in inappropriate state");
657 int oldState = state;
658 CPUState saved = new CPUState();
660 CPUState cpustate = saved.dup();
662 cpustate.r[SP] = cpustate.r[SP]&~15;
663 cpustate.r[RA] = 0xdeadbeef;
665 switch(rest.length) {
666 case 7: cpustate.r[S3] = rest[6];
667 case 6: cpustate.r[S2] = rest[5];
668 case 5: cpustate.r[S1] = rest[4];
669 case 4: cpustate.r[S0] = rest[3];
670 case 3: cpustate.r[A3] = rest[2];
671 case 2: cpustate.r[A2] = rest[1];
672 case 1: cpustate.r[A1] = rest[0];
678 setCPUState(cpustate);
680 getCPUState(cpustate);
683 if(state != PAUSED) throw new CallException("Process exit()ed while servicing a call() request");
686 return cpustate.r[V1];
689 /** Allocated an entry in the FileDescriptor table for <i>fd</i> and returns the number.
690 Returns -1 if the table is full. This can be used by subclasses to use custom file
692 public final int addFD(FD fd) {
693 if(state == EXITED || state == EXECED) throw new IllegalStateException("addFD called in inappropriate state");
695 for(i=0;i<OPEN_MAX;i++) if(fds[i] == null) break;
696 if(i==OPEN_MAX) return -1;
698 closeOnExec[i] = false;
702 /** Closes file descriptor <i>fdn</i> and removes it from the file descriptor table */
703 public final boolean closeFD(int fdn) {
704 if(state == EXITED || state == EXECED) throw new IllegalStateException("closeFD called in inappropriate state");
705 if(fdn < 0 || fdn >= OPEN_MAX) return false;
706 if(fds[fdn] == null) return false;
712 /** Duplicates the file descriptor <i>fdn</i> and returns the new fs */
713 public final int dupFD(int fdn) {
715 if(fdn < 0 || fdn >= OPEN_MAX) return -1;
716 if(fds[fdn] == null) return -1;
717 for(i=0;i<OPEN_MAX;i++) if(fds[i] == null) break;
718 if(i==OPEN_MAX) return -1;
719 fds[i] = fds[fdn].dup();
723 public static final int RD_ONLY = 0;
724 public static final int WR_ONLY = 1;
725 public static final int RDWR = 2;
727 public static final int O_CREAT = 0x0200;
728 public static final int O_EXCL = 0x0800;
729 public static final int O_APPEND = 0x0008;
730 public static final int O_TRUNC = 0x0400;
731 public static final int O_NONBLOCK = 0x4000;
732 public static final int O_NOCTTY = 0x8000;
735 FD hostFSOpen(final File f, int flags, int mode, final Object data) throws ErrnoException {
736 if((flags & ~(3|O_CREAT|O_EXCL|O_APPEND|O_TRUNC)) != 0) {
738 System.err.println("WARNING: Unsupported flags passed to open(\"" + f + "\"): " + toHex(flags & ~(3|O_CREAT|O_EXCL|O_APPEND|O_TRUNC)));
739 throw new ErrnoException(ENOTSUP);
741 boolean write = (flags&3) != RD_ONLY;
743 if(sm != null && !(write ? sm.allowWrite(f) : sm.allowRead(f))) throw new ErrnoException(EACCES);
745 if((flags & (O_EXCL|O_CREAT)) == (O_EXCL|O_CREAT)) {
747 if(!Platform.atomicCreateFile(f)) throw new ErrnoException(EEXIST);
748 } catch(IOException e) {
749 throw new ErrnoException(EIO);
751 } else if(!f.exists()) {
752 if((flags&O_CREAT)==0) return null;
753 } else if(f.isDirectory()) {
754 return hostFSDirFD(f,data);
757 final Seekable.File sf;
759 sf = new Seekable.File(f,write,(flags & O_TRUNC) != 0);
760 } catch(FileNotFoundException e) {
761 if(e.getMessage() != null && e.getMessage().indexOf("Permission denied") >= 0) throw new ErrnoException(EACCES);
763 } catch(IOException e) { throw new ErrnoException(EIO); }
765 return new SeekableFD(sf,flags) { protected FStat _fstat() { return hostFStat(f,data); } };
768 FStat hostFStat(File f, Object data) { return new HostFStat(f); }
770 FD hostFSDirFD(File f, Object data) { return null; }
772 FD _open(String path, int flags, int mode) throws ErrnoException {
773 return hostFSOpen(new File(path),flags,mode,null);
776 /** The open syscall */
777 private int sys_open(int addr, int flags, int mode) throws ErrnoException, FaultException {
778 String name = cstring(addr);
780 // HACK: TeX, or GPC, or something really sucks
781 if(name.length() == 1024 && getClass().getName().equals("tests.TeX")) name = name.trim();
783 flags &= ~O_NOCTTY; // this is meaningless under nestedvm
784 FD fd = _open(name,flags,mode);
785 if(fd == null) return -ENOENT;
787 if(fdn == -1) { fd.close(); return -ENFILE; }
791 /** The write syscall */
793 private int sys_write(int fdn, int addr, int count) throws FaultException, ErrnoException {
794 count = Math.min(count,MAX_CHUNK);
795 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
796 if(fds[fdn] == null) return -EBADFD;
797 byte[] buf = byteBuf(count);
798 copyin(addr,buf,count);
800 return fds[fdn].write(buf,0,count);
801 } catch(ErrnoException e) {
802 if(e.errno == EPIPE) sys_exit(128+13);
807 /** The read syscall */
808 private int sys_read(int fdn, int addr, int count) throws FaultException, ErrnoException {
809 count = Math.min(count,MAX_CHUNK);
810 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
811 if(fds[fdn] == null) return -EBADFD;
812 byte[] buf = byteBuf(count);
813 int n = fds[fdn].read(buf,0,count);
818 /** The ftruncate syscall */
819 private int sys_ftruncate(int fdn, long length) {
820 if (fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
821 if (fds[fdn] == null) return -EBADFD;
823 Seekable seekable = fds[fdn].seekable();
824 if (length < 0 || seekable == null) return -EINVAL;
825 try { seekable.resize(length); } catch (IOException e) { return -EIO; }
829 /** The close syscall */
830 private int sys_close(int fdn) {
831 return closeFD(fdn) ? 0 : -EBADFD;
835 /** The seek syscall */
836 private int sys_lseek(int fdn, int offset, int whence) throws ErrnoException {
837 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
838 if(fds[fdn] == null) return -EBADFD;
839 if(whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) return -EINVAL;
840 int n = fds[fdn].seek(offset,whence);
841 return n < 0 ? -ESPIPE : n;
844 /** The stat/fstat syscall helper */
845 int stat(FStat fs, int addr) throws FaultException {
846 memWrite(addr+0,(fs.dev()<<16)|(fs.inode()&0xffff)); // st_dev (top 16), // st_ino (bottom 16)
847 memWrite(addr+4,((fs.type()&0xf000))|(fs.mode()&0xfff)); // st_mode
848 memWrite(addr+8,fs.nlink()<<16|fs.uid()&0xffff); // st_nlink (top 16) // st_uid (bottom 16)
849 memWrite(addr+12,fs.gid()<<16|0); // st_gid (top 16) // st_rdev (bottom 16)
850 memWrite(addr+16,fs.size()); // st_size
851 memWrite(addr+20,fs.atime()); // st_atime
852 // memWrite(addr+24,0) // st_spare1
853 memWrite(addr+28,fs.mtime()); // st_mtime
854 // memWrite(addr+32,0) // st_spare2
855 memWrite(addr+36,fs.ctime()); // st_ctime
856 // memWrite(addr+40,0) // st_spare3
857 memWrite(addr+44,fs.blksize()); // st_bklsize;
858 memWrite(addr+48,fs.blocks()); // st_blocks
859 // memWrite(addr+52,0) // st_spare4[0]
860 // memWrite(addr+56,0) // st_spare4[1]
864 /** The fstat syscall */
865 private int sys_fstat(int fdn, int addr) throws FaultException {
866 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
867 if(fds[fdn] == null) return -EBADFD;
868 return stat(fds[fdn].fstat(),addr);
877 private int sys_gettimeofday(int timevalAddr, int timezoneAddr) throws FaultException {
878 long now = System.currentTimeMillis();
879 int tv_sec = (int)(now / 1000);
880 int tv_usec = (int)((now%1000)*1000);
881 memWrite(timevalAddr+0,tv_sec);
882 memWrite(timevalAddr+4,tv_usec);
886 private int sys_sleep(int sec) {
887 if(sec < 0) sec = Integer.MAX_VALUE;
889 Thread.sleep((long)sec*1000);
891 } catch(InterruptedException e) {
897 #define _CLOCKS_PER_SEC_ 1000
898 #define _CLOCK_T_ unsigned long
906 private int sys_times(int tms) {
907 long now = System.currentTimeMillis();
908 int userTime = (int)((now - startTime)/16);
909 int sysTime = (int)((now - startTime)/16);
913 memWrite(tms+0,userTime);
914 memWrite(tms+4,sysTime);
915 memWrite(tms+8,userTime);
916 memWrite(tms+12,sysTime);
918 } catch(FaultException e) {
924 private int sys_sysconf(int n) {
926 case _SC_CLK_TCK: return 1000;
927 case _SC_PAGESIZE: return writePages.length == 1 ? 4096 : (1<<pageShift);
928 case _SC_PHYS_PAGES: return writePages.length == 1 ? (1<<pageShift)/4096 : writePages.length;
930 if(STDERR_DIAG) System.err.println("WARNING: Attempted to use unknown sysconf key: " + n);
935 /** The sbrk syscall. This can also be used by subclasses to allocate memory.
936 <i>incr</i> is how much to increase the break by */
937 public final int sbrk(int incr) {
938 if(incr < 0) return -ENOMEM;
939 if(incr==0) return heapEnd;
941 int oldEnd = heapEnd;
942 int newEnd = oldEnd + incr;
943 if(newEnd >= stackBottom) return -ENOMEM;
945 if(writePages.length > 1) {
946 int pageMask = (1<<pageShift) - 1;
947 int pageWords = (1<<pageShift) >>> 2;
948 int start = (oldEnd + pageMask) >>> pageShift;
949 int end = (newEnd + pageMask) >>> pageShift;
951 for(int i=start;i<end;i++) readPages[i] = writePages[i] = new int[pageWords];
952 } catch(OutOfMemoryError e) {
953 if(STDERR_DIAG) System.err.println("WARNING: Caught OOM Exception in sbrk: " + e);
961 /** The getpid syscall */
962 private int sys_getpid() { return getPid(); }
963 int getPid() { return 1; }
965 public static interface CallJavaCB { public int call(int a, int b, int c, int d); }
967 private int sys_calljava(int a, int b, int c, int d) {
968 if(state != RUNNING) throw new IllegalStateException("wound up calling sys_calljava while not in RUNNING");
969 if(callJavaCB != null) {
973 ret = callJavaCB.call(a,b,c,d);
974 } catch(RuntimeException e) {
975 System.err.println("Error while executing callJavaCB");
982 if(STDERR_DIAG) System.err.println("WARNING: calljava syscall invoked without a calljava callback set");
987 private int sys_pause() {
992 private int sys_getpagesize() { return writePages.length == 1 ? 4096 : (1<<pageShift); }
994 /** Hook for subclasses to do something when the process exits */
997 void exit(int status, boolean fromSignal) {
998 if(fromSignal && fds[2] != null) {
1000 byte[] msg = getBytes("Process exited on signal " + (status - 128) + "\n");
1001 fds[2].write(msg,0,msg.length);
1002 } catch(ErrnoException e) { }
1004 exitStatus = status;
1005 for(int i=0;i<fds.length;i++) if(fds[i] != null) closeFD(i);
1010 private int sys_exit(int status) {
1015 private int sys_fcntl(int fdn, int cmd, int arg) throws FaultException {
1018 if(fdn < 0 || fdn >= OPEN_MAX) return -EBADFD;
1019 if(fds[fdn] == null) return -EBADFD;
1024 if(arg < 0 || arg >= OPEN_MAX) return -EINVAL;
1025 for(i=arg;i<OPEN_MAX;i++) if(fds[i]==null) break;
1026 if(i==OPEN_MAX) return -EMFILE;
1032 closeOnExec[fdn] = arg != 0;
1035 return closeOnExec[fdn] ? 1 : 0;
1039 return sys_fcntl_lock(fd, cmd, arg);
1040 } catch (IOException e) { throw new RuntimeException(e);}
1042 if(STDERR_DIAG) System.err.println("WARNING: Unknown fcntl command: " + cmd);
1047 /** Implements the F_GETLK and F_SETLK cases of fcntl syscall.
1048 * If l_start = 0 and l_len = 0 the lock refers to the entire file.
1050 short l_type; // lock type: F_UNLCK, F_RDLCK, F_WRLCK
1051 short l_whence; // type of l_start: SEEK_SET, SEEK_CUR, SEEK_END
1052 long l_start; // starting offset, bytes
1053 long l_len; // len = 0 means until EOF
1054 short l_pid; // lock owner
1055 short l_xxx; // padding
1058 private int sys_fcntl_lock(FD fd, int cmd, int arg)
1059 throws FaultException, IOException {
1060 if (arg == 0) { System.out.println("BAD ARG"); return -EINVAL; }
1061 int word = memRead(arg);
1062 int l_start = memRead(arg+4);
1063 int l_len = memRead(arg+8);
1064 int l_type = word>>16;
1065 int l_whence = word&0x00ff;
1067 Seekable s = fd.seekable();
1068 if (s == null) return -EINVAL;
1071 case SEEK_SET: break;
1072 case SEEK_CUR: l_start += s.pos(); break;
1073 case SEEK_END: l_start += s.length(); break;
1077 if (cmd != F_GETLK && cmd != F_SETLK) return -EINVAL;
1079 if (cmd == F_GETLK) {
1080 // Check if an l_type lock can be aquired. The only way to
1081 // do this within the Java API is to try and create a lock.
1082 Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
1086 memWrite(arg, SEEK_SET|(F_UNLCK<<16));
1093 // now processing F_SETLK
1094 if (cmd != F_SETLK) return -EINVAL;
1096 if (l_type == F_UNLCK) {
1097 // release all locks that fall within the boundaries given
1098 for (int i=0; i < LOCK_MAX; i++) {
1099 if (locks[i] == null || !s.equals(locks[i].seekable()))
1102 int pos = (int)locks[i].position();
1103 if (pos < l_start) continue;
1104 if (l_start != 0 && l_len != 0) // start/len 0 means unlock all
1105 if (pos + locks[i].size() > l_start + l_len)
1113 } else if (l_type == F_RDLCK || l_type == F_WRLCK) {
1114 // first see if a lock already exists
1115 for (int i=0; i < LOCK_MAX; i++) {
1116 if (locks[i] == null || !s.equals(locks[i].seekable()))
1118 int pos = (int)locks[i].position();
1119 int size = (int)locks[i].size();
1120 if (l_start < pos && pos + size < l_start + l_len) {
1121 // found a lock contained in the new requested lock
1125 } else if (l_start >= pos && pos + size >= l_start + l_len) {
1126 // found a lock that contains the requested lock
1127 if (locks[i].isShared() == (l_type == F_RDLCK)) {
1128 memWrite(arg+4, pos);
1129 memWrite(arg+8, size);
1139 Seekable.Lock lock = s.lock(l_start, l_len, l_type == F_RDLCK);
1140 if (lock == null) return -EAGAIN;
1143 for (i=0; i < LOCK_MAX; i++)
1144 if (locks[i] == null) break;
1145 if (i == LOCK_MAX) return -ENOLCK;
1155 /** The syscall dispatcher.
1156 The should be called by subclasses when the syscall instruction is invoked.
1157 <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
1158 the contenst of A0, A1, A2, and A3. The call MAY change the state
1159 @see Runtime#state state */
1160 protected final int syscall(int syscall, int a, int b, int c, int d, int e, int f) {
1162 int n = _syscall(syscall,a,b,c,d,e,f);
1163 //if(n<0) throw new ErrnoException(-n);
1165 } catch(ErrnoException ex) {
1166 //System.err.println("While executing syscall: " + syscall + ":");
1167 //if(syscall == SYS_open) try { System.err.println("Failed to open " + cstring(a) + " errno " + ex.errno); } catch(Exception e2) { }
1168 //ex.printStackTrace();
1170 } catch(FaultException ex) {
1172 } catch(RuntimeException ex) {
1173 ex.printStackTrace();
1174 throw new Error("Internal Error in _syscall()");
1178 int _syscall(int syscall, int a, int b, int c, int d, int e, int f) throws ErrnoException, FaultException {
1180 case SYS_null: return 0;
1181 case SYS_exit: return sys_exit(a);
1182 case SYS_pause: return sys_pause();
1183 case SYS_write: return sys_write(a,b,c);
1184 case SYS_fstat: return sys_fstat(a,b);
1185 case SYS_sbrk: return sbrk(a);
1186 case SYS_open: return sys_open(a,b,c);
1187 case SYS_close: return sys_close(a);
1188 case SYS_read: return sys_read(a,b,c);
1189 case SYS_lseek: return sys_lseek(a,b,c);
1190 case SYS_ftruncate: return sys_ftruncate(a,b);
1191 case SYS_getpid: return sys_getpid();
1192 case SYS_calljava: return sys_calljava(a,b,c,d);
1193 case SYS_gettimeofday: return sys_gettimeofday(a,b);
1194 case SYS_sleep: return sys_sleep(a);
1195 case SYS_times: return sys_times(a);
1196 case SYS_getpagesize: return sys_getpagesize();
1197 case SYS_fcntl: return sys_fcntl(a,b,c);
1198 case SYS_sysconf: return sys_sysconf(a);
1199 case SYS_getuid: return sys_getuid();
1200 case SYS_geteuid: return sys_geteuid();
1201 case SYS_getgid: return sys_getgid();
1202 case SYS_getegid: return sys_getegid();
1204 case SYS_memcpy: memcpy(a,b,c); return a;
1205 case SYS_memset: memset(a,b,c); return a;
1216 if(STDERR_DIAG) System.err.println("Attempted to use a UnixRuntime syscall in Runtime (" + syscall + ")");
1219 if(STDERR_DIAG) System.err.println("Attempted to use unknown syscall: " + syscall);
1224 private int sys_getuid() { return 0; }
1225 private int sys_geteuid() { return 0; }
1226 private int sys_getgid() { return 0; }
1227 private int sys_getegid() { return 0; }
1229 public int xmalloc(int size) { int p=malloc(size); if(p==0) throw new RuntimeException("malloc() failed"); return p; }
1230 public int xrealloc(int addr,int newsize) { int p=realloc(addr,newsize); if(p==0) throw new RuntimeException("realloc() failed"); return p; }
1231 public int realloc(int addr, int newsize) { try { return call("realloc",addr,newsize); } catch(CallException e) { return 0; } }
1232 public int malloc(int size) { try { return call("malloc",size); } catch(CallException e) { return 0; } }
1233 public void free(int p) { try { if(p!=0) call("free",p); } catch(CallException e) { /*noop*/ } }
1235 /** Helper function to create a cstring in main memory */
1236 public int strdup(String s) {
1238 if(s == null) s = "(null)";
1239 byte[] a2 = getBytes(s);
1240 a = new byte[a2.length+1];
1241 System.arraycopy(a2,0,a,0,a2.length);
1242 int addr = malloc(a.length);
1243 if(addr == 0) return 0;
1245 copyout(a,addr,a.length);
1246 } catch(FaultException e) {
1253 /** Helper function to read a cstring from main memory */
1254 public final String cstring(int addr) throws ReadFaultException {
1255 if (addr == 0) return null;
1256 StringBuffer sb = new StringBuffer();
1258 int word = memRead(addr&~3);
1260 case 0: if(((word>>>24)&0xff)==0) return sb.toString(); sb.append((char)((word>>>24)&0xff)); addr++;
1261 case 1: if(((word>>>16)&0xff)==0) return sb.toString(); sb.append((char)((word>>>16)&0xff)); addr++;
1262 case 2: if(((word>>> 8)&0xff)==0) return sb.toString(); sb.append((char)((word>>> 8)&0xff)); addr++;
1263 case 3: if(((word>>> 0)&0xff)==0) return sb.toString(); sb.append((char)((word>>> 0)&0xff)); addr++;
1268 /** File Descriptor class */
1269 public static abstract class FD {
1270 private int refCount = 1;
1272 /** Read some bytes. Should return the number of bytes read, 0 on EOF, or throw an IOException on error */
1273 public int read(byte[] a, int off, int length) throws ErrnoException { throw new ErrnoException(EBADFD); }
1274 /** Write. Should return the number of bytes written or throw an IOException on error */
1275 public int write(byte[] a, int off, int length) throws ErrnoException { throw new ErrnoException(EBADFD); }
1277 /** Seek in the filedescriptor. Whence is SEEK_SET, SEEK_CUR, or SEEK_END. Should return -1 on error or the new position. */
1278 public int seek(int n, int whence) throws ErrnoException { return -1; }
1280 public int getdents(byte[] a, int off, int length) throws ErrnoException { throw new ErrnoException(EBADFD); }
1282 /** Return a Seekable object representing this file descriptor (can be read only)
1283 This is required for exec() */
1284 Seekable seekable() { return null; }
1286 private FStat cachedFStat = null;
1287 public final FStat fstat() {
1288 if(cachedFStat == null) cachedFStat = _fstat();
1292 protected abstract FStat _fstat();
1293 public abstract int flags();
1295 /** Closes the fd */
1296 public final void close() { if(--refCount==0) _close(); }
1297 protected void _close() { /* noop*/ }
1299 FD dup() { refCount++; return this; }
1302 /** FileDescriptor class for normal files */
1303 public abstract static class SeekableFD extends FD {
1304 private final int flags;
1305 private final Seekable data;
1307 SeekableFD(Seekable data, int flags) { this.data = data; this.flags = flags; }
1309 protected abstract FStat _fstat();
1310 public int flags() { return flags; }
1312 Seekable seekable() { return data; }
1314 public int seek(int n, int whence) throws ErrnoException {
1317 case SEEK_SET: break;
1318 case SEEK_CUR: n += data.pos(); break;
1319 case SEEK_END: n += data.length(); break;
1324 } catch(IOException e) {
1325 throw new ErrnoException(ESPIPE);
1329 public int write(byte[] a, int off, int length) throws ErrnoException {
1330 if((flags&3) == RD_ONLY) throw new ErrnoException(EBADFD);
1331 // NOTE: There is race condition here but we can't fix it in pure java
1332 if((flags&O_APPEND) != 0) seek(0,SEEK_END);
1334 return data.write(a,off,length);
1335 } catch(IOException e) {
1336 throw new ErrnoException(EIO);
1340 public int read(byte[] a, int off, int length) throws ErrnoException {
1341 if((flags&3) == WR_ONLY) throw new ErrnoException(EBADFD);
1343 int n = data.read(a,off,length);
1344 return n < 0 ? 0 : n;
1345 } catch(IOException e) {
1346 throw new ErrnoException(EIO);
1350 protected void _close() { try { data.close(); } catch(IOException e) { /*ignore*/ } }
1353 public static class InputOutputStreamFD extends FD {
1354 private final InputStream is;
1355 private final OutputStream os;
1357 public InputOutputStreamFD(InputStream is) { this(is,null); }
1358 public InputOutputStreamFD(OutputStream os) { this(null,os); }
1359 public InputOutputStreamFD(InputStream is, OutputStream os) {
1362 if(is == null && os == null) throw new IllegalArgumentException("at least one stream must be supplied");
1365 public int flags() {
1366 if(is != null && os != null) return O_RDWR;
1367 if(is != null) return O_RDONLY;
1368 if(os != null) return O_WRONLY;
1369 throw new Error("should never happen");
1372 public void _close() {
1373 if(is != null) try { is.close(); } catch(IOException e) { /*ignore*/ }
1374 if(os != null) try { os.close(); } catch(IOException e) { /*ignore*/ }
1377 public int read(byte[] a, int off, int length) throws ErrnoException {
1378 if(is == null) return super.read(a,off,length);
1380 int n = is.read(a,off,length);
1381 return n < 0 ? 0 : n;
1382 } catch(IOException e) {
1383 throw new ErrnoException(EIO);
1387 public int write(byte[] a, int off, int length) throws ErrnoException {
1388 if(os == null) return super.write(a,off,length);
1390 os.write(a,off,length);
1392 } catch(IOException e) {
1393 throw new ErrnoException(EIO);
1397 public FStat _fstat() { return new SocketFStat(); }
1400 static class TerminalFD extends InputOutputStreamFD {
1401 public TerminalFD(InputStream is) { this(is,null); }
1402 public TerminalFD(OutputStream os) { this(null,os); }
1403 public TerminalFD(InputStream is, OutputStream os) { super(is,os); }
1404 public void _close() { /* noop */ }
1405 public FStat _fstat() { return new SocketFStat() { public int type() { return S_IFCHR; } public int mode() { return 0600; } }; }
1408 // This is pretty inefficient but it is only used for reading from the console on win32
1409 static class Win32ConsoleIS extends InputStream {
1410 private int pushedBack = -1;
1411 private final InputStream parent;
1412 public Win32ConsoleIS(InputStream parent) { this.parent = parent; }
1413 public int read() throws IOException {
1414 if(pushedBack != -1) { int c = pushedBack; pushedBack = -1; return c; }
1415 int c = parent.read();
1416 if(c == '\r' && (c = parent.read()) != '\n') { pushedBack = c; return '\r'; }
1419 public int read(byte[] buf, int pos, int len) throws IOException {
1421 if(pushedBack != -1 && len > 0) {
1422 buf[0] = (byte) pushedBack;
1424 pos++; len--; pb = true;
1426 int n = parent.read(buf,pos,len);
1427 if(n == -1) return pb ? 1 : -1;
1428 for(int i=0;i<n;i++) {
1429 if(buf[pos+i] == '\r') {
1431 int c = parent.read();
1432 if(c == '\n') buf[pos+i] = '\n';
1433 else pushedBack = c;
1434 } else if(buf[pos+i+1] == '\n') {
1435 System.arraycopy(buf,pos+i+1,buf,pos+i,len-i-1);
1440 return n + (pb ? 1 : 0);
1444 public abstract static class FStat {
1445 public static final int S_IFIFO = 0010000;
1446 public static final int S_IFCHR = 0020000;
1447 public static final int S_IFDIR = 0040000;
1448 public static final int S_IFREG = 0100000;
1449 public static final int S_IFSOCK = 0140000;
1451 public int mode() { return 0; }
1452 public int nlink() { return 0; }
1453 public int uid() { return 0; }
1454 public int gid() { return 0; }
1455 public int size() { return 0; }
1456 public int atime() { return 0; }
1457 public int mtime() { return 0; }
1458 public int ctime() { return 0; }
1459 public int blksize() { return 512; }
1460 public int blocks() { return (size()+blksize()-1)/blksize(); }
1462 public abstract int dev();
1463 public abstract int type();
1464 public abstract int inode();
1467 public static class SocketFStat extends FStat {
1468 public int dev() { return -1; }
1469 public int type() { return S_IFSOCK; }
1470 public int inode() { return hashCode() & 0x7fff; }
1473 static class HostFStat extends FStat {
1474 private final File f;
1475 private final boolean executable;
1476 public HostFStat(File f) { this(f,false); }
1477 public HostFStat(File f, boolean executable) {
1479 this.executable = executable;
1481 public int dev() { return 1; }
1482 public int inode() { return f.getAbsolutePath().hashCode() & 0x7fff; }
1483 public int type() { return f.isDirectory() ? S_IFDIR : S_IFREG; }
1484 public int nlink() { return 1; }
1487 boolean canread = f.canRead();
1488 if(canread && (executable || f.isDirectory())) mode |= 0111;
1489 if(canread) mode |= 0444;
1490 if(f.canWrite()) mode |= 0222;
1493 public int size() { return (int) f.length(); }
1494 public int mtime() { return (int)(f.lastModified()/1000); }
1498 public static class ReadFaultException extends FaultException {
1499 public ReadFaultException(int addr) { super(addr); }
1501 public static class WriteFaultException extends FaultException {
1502 public WriteFaultException(int addr) { super(addr); }
1504 public static class FaultException extends ExecutionException {
1505 public final int addr;
1506 public final RuntimeException cause;
1507 public FaultException(int addr) { super("fault at: " + toHex(addr)); this.addr = addr; cause = null; }
1508 public FaultException(RuntimeException e) { super(e.toString()); addr = -1; cause = e; }
1510 public static class ExecutionException extends Exception {
1511 private String message = "(null)";
1512 private String location = "(unknown)";
1513 public ExecutionException() { /* noop */ }
1514 public ExecutionException(String s) { if(s != null) message = s; }
1515 void setLocation(String s) { location = s == null ? "(unknown)" : s; }
1516 public final String getMessage() { return message + " at " + location; }
1518 public static class CallException extends Exception {
1519 public CallException(String s) { super(s); }
1522 protected static class ErrnoException extends Exception {
1524 public ErrnoException(int errno) { super("Errno: " + errno); this.errno = errno; }
1528 protected static class CPUState {
1529 public CPUState() { /* noop */ }
1531 public int[] r = new int[32];
1532 /* Floating point regs */
1533 public int[] f = new int[32];
1538 public CPUState dup() {
1539 CPUState c = new CPUState();
1544 for(int i=0;i<32;i++) {
1552 public static class SecurityManager {
1553 public boolean allowRead(File f) { return true; }
1554 public boolean allowWrite(File f) { return true; }
1555 public boolean allowStat(File f) { return true; }
1556 public boolean allowUnlink(File f) { return true; }
1559 // Null pointer check helper function
1560 protected final void nullPointerCheck(int addr) throws ExecutionException {
1562 throw new ExecutionException("Attempted to dereference a null pointer " + toHex(addr));
1565 // Utility functions
1566 byte[] byteBuf(int size) {
1567 if(_byteBuf==null) _byteBuf = new byte[size];
1568 else if(_byteBuf.length < size)
1569 _byteBuf = new byte[min(max(_byteBuf.length*2,size),MAX_CHUNK)];
1573 /** Decode a packed string */
1574 protected static final int[] decodeData(String s, int words) {
1575 if(s.length() % 8 != 0) throw new IllegalArgumentException("string length must be a multiple of 8");
1576 if((s.length() / 8) * 7 < words*4) throw new IllegalArgumentException("string isn't big enough");
1577 int[] buf = new int[words];
1578 int prev = 0, left=0;
1579 for(int i=0,n=0;n<words;i+=8) {
1581 for(int j=0;j<8;j++) { l <<= 7; l |= s.charAt(i+j) & 0x7f; }
1582 if(left > 0) buf[n++] = prev | (int)(l>>>(56-left));
1583 if(n < words) buf[n++] = (int) (l >>> (24-left));
1584 left = (left + 8) & 0x1f;
1585 prev = (int)(l << left);
1590 static byte[] getBytes(String s) {
1592 return s.getBytes("ISO-8859-1");
1593 } catch(UnsupportedEncodingException e) {
1594 return null; // should never happen
1598 static byte[] getNullTerminatedBytes(String s) {
1599 byte[] buf1 = getBytes(s);
1600 byte[] buf2 = new byte[buf1.length+1];
1601 System.arraycopy(buf1,0,buf2,0,buf1.length);
1605 final static String toHex(int n) { return "0x" + Long.toString(n & 0xffffffffL, 16); }
1606 final static int min(int a, int b) { return a < b ? a : b; }
1607 final static int max(int a, int b) { return a > b ? a : b; }