syscall_emul.hh revision 2021 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __SIM_SYSCALL_EMUL_HH__
30#define __SIM_SYSCALL_EMUL_HH__
31
32///
33/// @file syscall_emul.hh
34///
35/// This file defines objects used to emulate syscalls from the target
36/// application on the host machine.
37
38#include <errno.h>
39#include <string>
40#ifdef __CYGWIN32__
41#include <sys/fcntl.h>	// for O_BINARY
42#endif
43#include <sys/uio.h>
44
45#include "base/intmath.hh"	// for RoundUp
46#include "mem/functional/functional.hh"
47#include "targetarch/isa_traits.hh"	// for Addr
48
49#include "base/trace.hh"
50#include "cpu/exec_context.hh"
51#include "sim/process.hh"
52
53///
54/// System call descriptor.
55///
56class SyscallDesc {
57
58  public:
59
60    /// Typedef for target syscall handler functions.
61    typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
62                           Process *, ExecContext *);
63
64    const char *name;	//!< Syscall name (e.g., "open").
65    FuncPtr funcPtr;	//!< Pointer to emulation function.
66    int flags;		//!< Flags (see Flags enum).
67
68    /// Flag values for controlling syscall behavior.
69    enum Flags {
70        /// Don't set return regs according to funcPtr return value.
71        /// Used for syscalls with non-standard return conventions
72        /// that explicitly set the ExecContext regs (e.g.,
73        /// sigreturn).
74        SuppressReturnValue = 1
75    };
76
77    /// Constructor.
78    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
79        : name(_name), funcPtr(_funcPtr), flags(_flags)
80    {
81    }
82
83    /// Emulate the syscall.  Public interface for calling through funcPtr.
84    void doSyscall(int callnum, Process *proc, ExecContext *xc);
85};
86
87
88class BaseBufferArg {
89
90  public:
91
92    BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
93    {
94        bufPtr = new uint8_t[size];
95        // clear out buffer: in case we only partially populate this,
96        // and then do a copyOut(), we want to make sure we don't
97        // introduce any random junk into the simulated address space
98        memset(bufPtr, 0, size);
99    }
100
101    virtual ~BaseBufferArg() { delete [] bufPtr; }
102
103    //
104    // copy data into simulator space (read from target memory)
105    //
106    virtual bool copyIn(FunctionalMemory *mem)
107    {
108        mem->access(Read, addr, bufPtr, size);
109        return true;	// no EFAULT detection for now
110    }
111
112    //
113    // copy data out of simulator space (write to target memory)
114    //
115    virtual bool copyOut(FunctionalMemory *mem)
116    {
117        mem->access(Write, addr, bufPtr, size);
118        return true;	// no EFAULT detection for now
119    }
120
121  protected:
122    Addr addr;
123    int size;
124    uint8_t *bufPtr;
125};
126
127
128class BufferArg : public BaseBufferArg
129{
130  public:
131    BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
132    void *bufferPtr()	{ return bufPtr; }
133};
134
135template <class T>
136class TypedBufferArg : public BaseBufferArg
137{
138  public:
139    // user can optionally specify a specific number of bytes to
140    // allocate to deal with those structs that have variable-size
141    // arrays at the end
142    TypedBufferArg(Addr _addr, int _size = sizeof(T))
143        : BaseBufferArg(_addr, _size)
144    { }
145
146    // type case
147    operator T*() { return (T *)bufPtr; }
148
149    // dereference operators
150    T &operator*()	 { return *((T *)bufPtr); }
151    T* operator->()	 { return (T *)bufPtr; }
152    T &operator[](int i) { return ((T *)bufPtr)[i]; }
153};
154
155//////////////////////////////////////////////////////////////////////
156//
157// The following emulation functions are generic enough that they
158// don't need to be recompiled for different emulated OS's.  They are
159// defined in sim/syscall_emul.cc.
160//
161//////////////////////////////////////////////////////////////////////
162
163
164/// Handler for unimplemented syscalls that we haven't thought about.
165SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
166                                Process *p, ExecContext *xc);
167
168/// Handler for unimplemented syscalls that we never intend to
169/// implement (signal handling, etc.) and should not affect the correct
170/// behavior of the program.  Print a warning only if the appropriate
171/// trace flag is enabled.  Return success to the target program.
172SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
173                         Process *p, ExecContext *xc);
174
175/// Target exit() handler: terminate simulation.
176SyscallReturn exitFunc(SyscallDesc *desc, int num,
177                       Process *p, ExecContext *xc);
178
179/// Target getpagesize() handler.
180SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
181                              Process *p, ExecContext *xc);
182
183/// Target obreak() handler: set brk address.
184SyscallReturn obreakFunc(SyscallDesc *desc, int num,
185                         Process *p, ExecContext *xc);
186
187/// Target close() handler.
188SyscallReturn closeFunc(SyscallDesc *desc, int num,
189                        Process *p, ExecContext *xc);
190
191/// Target read() handler.
192SyscallReturn readFunc(SyscallDesc *desc, int num,
193                       Process *p, ExecContext *xc);
194
195/// Target write() handler.
196SyscallReturn writeFunc(SyscallDesc *desc, int num,
197                        Process *p, ExecContext *xc);
198
199/// Target lseek() handler.
200SyscallReturn lseekFunc(SyscallDesc *desc, int num,
201                        Process *p, ExecContext *xc);
202
203/// Target munmap() handler.
204SyscallReturn munmapFunc(SyscallDesc *desc, int num,
205                         Process *p, ExecContext *xc);
206
207/// Target gethostname() handler.
208SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
209                              Process *p, ExecContext *xc);
210
211/// Target unlink() handler.
212SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
213                         Process *p, ExecContext *xc);
214
215/// Target rename() handler.
216SyscallReturn renameFunc(SyscallDesc *desc, int num,
217                         Process *p, ExecContext *xc);
218
219
220/// Target truncate() handler.
221SyscallReturn truncateFunc(SyscallDesc *desc, int num,
222                           Process *p, ExecContext *xc);
223
224
225/// Target ftruncate() handler.
226SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
227                            Process *p, ExecContext *xc);
228
229
230/// Target chown() handler.
231SyscallReturn chownFunc(SyscallDesc *desc, int num,
232                        Process *p, ExecContext *xc);
233
234
235/// Target fchown() handler.
236SyscallReturn fchownFunc(SyscallDesc *desc, int num,
237                         Process *p, ExecContext *xc);
238
239/// This struct is used to build an target-OS-dependent table that
240/// maps the target's open() flags to the host open() flags.
241struct OpenFlagTransTable {
242    int tgtFlag;	//!< Target system flag value.
243    int hostFlag;	//!< Corresponding host system flag value.
244};
245
246
247
248/// A readable name for 1,000,000, for converting microseconds to seconds.
249const int one_million = 1000000;
250
251/// Approximate seconds since the epoch (1/1/1970).  About a billion,
252/// by my reckoning.  We want to keep this a constant (not use the
253/// real-world time) to keep simulations repeatable.
254const unsigned seconds_since_epoch = 1000000000;
255
256/// Helper function to convert current elapsed time to seconds and
257/// microseconds.
258template <class T1, class T2>
259void
260getElapsedTime(T1 &sec, T2 &usec)
261{
262    int elapsed_usecs = curTick / Clock::Int::us;
263    sec = elapsed_usecs / one_million;
264    usec = elapsed_usecs % one_million;
265}
266
267//////////////////////////////////////////////////////////////////////
268//
269// The following emulation functions are generic, but need to be
270// templated to account for differences in types, constants, etc.
271//
272//////////////////////////////////////////////////////////////////////
273
274/// Target ioctl() handler.  For the most part, programs call ioctl()
275/// only to find out if their stdout is a tty, to determine whether to
276/// do line or block buffering.
277template <class OS>
278SyscallReturn
279ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
280          ExecContext *xc)
281{
282    int fd = xc->getSyscallArg(0);
283    unsigned req = xc->getSyscallArg(1);
284
285    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
286
287    if (fd < 0 || process->sim_fd(fd) < 0) {
288        // doesn't map to any simulator fd: not a valid target fd
289        return -EBADF;
290    }
291
292    switch (req) {
293      case OS::TIOCISATTY:
294      case OS::TIOCGETP:
295      case OS::TIOCSETP:
296      case OS::TIOCSETN:
297      case OS::TIOCSETC:
298      case OS::TIOCGETC:
299      case OS::TIOCGETS:
300      case OS::TIOCGETA:
301        return -ENOTTY;
302
303      default:
304        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
305              fd, req, xc->readPC());
306    }
307}
308
309/// Target open() handler.
310template <class OS>
311SyscallReturn
312openFunc(SyscallDesc *desc, int callnum, Process *process,
313         ExecContext *xc)
314{
315    std::string path;
316
317    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
318        return -EFAULT;
319
320    if (path == "/dev/sysdev0") {
321        // This is a memory-mapped high-resolution timer device on Alpha.
322        // We don't support it, so just punt.
323        warn("Ignoring open(%s, ...)\n", path);
324        return -ENOENT;
325    }
326
327    int tgtFlags = xc->getSyscallArg(1);
328    int mode = xc->getSyscallArg(2);
329    int hostFlags = 0;
330
331    // translate open flags
332    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
333        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
334            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
335            hostFlags |= OS::openFlagTable[i].hostFlag;
336        }
337    }
338
339    // any target flags left?
340    if (tgtFlags != 0)
341        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
342
343#ifdef __CYGWIN32__
344    hostFlags |= O_BINARY;
345#endif
346
347    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
348
349    // open the file
350    int fd = open(path.c_str(), hostFlags, mode);
351
352    return (fd == -1) ? -errno : process->alloc_fd(fd);
353}
354
355
356/// Target chmod() handler.
357template <class OS>
358SyscallReturn
359chmodFunc(SyscallDesc *desc, int callnum, Process *process,
360          ExecContext *xc)
361{
362    std::string path;
363
364    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
365        return -EFAULT;
366
367    uint32_t mode = xc->getSyscallArg(1);
368    mode_t hostMode = 0;
369
370    // XXX translate mode flags via OS::something???
371    hostMode = mode;
372
373    // do the chmod
374    int result = chmod(path.c_str(), hostMode);
375    if (result < 0)
376        return errno;
377
378    return 0;
379}
380
381
382/// Target fchmod() handler.
383template <class OS>
384SyscallReturn
385fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
386           ExecContext *xc)
387{
388    int fd = xc->getSyscallArg(0);
389    if (fd < 0 || process->sim_fd(fd) < 0) {
390        // doesn't map to any simulator fd: not a valid target fd
391        return -EBADF;
392    }
393
394    uint32_t mode = xc->getSyscallArg(1);
395    mode_t hostMode = 0;
396
397    // XXX translate mode flags via OS::someting???
398    hostMode = mode;
399
400    // do the fchmod
401    int result = fchmod(process->sim_fd(fd), hostMode);
402    if (result < 0)
403        return errno;
404
405    return 0;
406}
407
408
409/// Target stat() handler.
410template <class OS>
411SyscallReturn
412statFunc(SyscallDesc *desc, int callnum, Process *process,
413         ExecContext *xc)
414{
415    std::string path;
416
417    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
418        return -EFAULT;
419
420    struct stat hostBuf;
421    int result = stat(path.c_str(), &hostBuf);
422
423    if (result < 0)
424        return errno;
425
426    OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
427
428    return 0;
429}
430
431
432/// Target fstat64() handler.
433template <class OS>
434SyscallReturn
435fstat64Func(SyscallDesc *desc, int callnum, Process *process,
436            ExecContext *xc)
437{
438    int fd = xc->getSyscallArg(0);
439    if (fd < 0 || process->sim_fd(fd) < 0) {
440        // doesn't map to any simulator fd: not a valid target fd
441        return -EBADF;
442    }
443
444    struct stat64 hostBuf;
445    int result = fstat64(process->sim_fd(fd), &hostBuf);
446
447    if (result < 0)
448        return errno;
449
450    OS::copyOutStat64Buf(xc->mem, xc->getSyscallArg(1), &hostBuf);
451
452    return 0;
453}
454
455
456/// Target lstat() handler.
457template <class OS>
458SyscallReturn
459lstatFunc(SyscallDesc *desc, int callnum, Process *process,
460          ExecContext *xc)
461{
462    std::string path;
463
464    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
465        return -EFAULT;
466
467    struct stat hostBuf;
468    int result = lstat(path.c_str(), &hostBuf);
469
470    if (result < 0)
471        return -errno;
472
473    OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
474
475    return 0;
476}
477
478/// Target lstat64() handler.
479template <class OS>
480SyscallReturn
481lstat64Func(SyscallDesc *desc, int callnum, Process *process,
482            ExecContext *xc)
483{
484    std::string path;
485
486    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
487        return -EFAULT;
488
489    struct stat64 hostBuf;
490    int result = lstat64(path.c_str(), &hostBuf);
491
492    if (result < 0)
493        return -errno;
494
495    OS::copyOutStat64Buf(xc->mem, xc->getSyscallArg(1), &hostBuf);
496
497    return 0;
498}
499
500/// Target fstat() handler.
501template <class OS>
502SyscallReturn
503fstatFunc(SyscallDesc *desc, int callnum, Process *process,
504          ExecContext *xc)
505{
506    int fd = process->sim_fd(xc->getSyscallArg(0));
507
508    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
509
510    if (fd < 0)
511        return -EBADF;
512
513    struct stat hostBuf;
514    int result = fstat(fd, &hostBuf);
515
516    if (result < 0)
517        return -errno;
518
519    OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
520
521    return 0;
522}
523
524
525/// Target statfs() handler.
526template <class OS>
527SyscallReturn
528statfsFunc(SyscallDesc *desc, int callnum, Process *process,
529           ExecContext *xc)
530{
531    std::string path;
532
533    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
534        return -EFAULT;
535
536    struct statfs hostBuf;
537    int result = statfs(path.c_str(), &hostBuf);
538
539    if (result < 0)
540        return errno;
541
542    OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
543
544    return 0;
545}
546
547
548/// Target fstatfs() handler.
549template <class OS>
550SyscallReturn
551fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
552            ExecContext *xc)
553{
554    int fd = process->sim_fd(xc->getSyscallArg(0));
555
556    if (fd < 0)
557        return -EBADF;
558
559    struct statfs hostBuf;
560    int result = fstatfs(fd, &hostBuf);
561
562    if (result < 0)
563        return errno;
564
565    OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
566
567    return 0;
568}
569
570
571/// Target writev() handler.
572template <class OS>
573SyscallReturn
574writevFunc(SyscallDesc *desc, int callnum, Process *process,
575           ExecContext *xc)
576{
577    int fd = xc->getSyscallArg(0);
578    if (fd < 0 || process->sim_fd(fd) < 0) {
579        // doesn't map to any simulator fd: not a valid target fd
580        return -EBADF;
581    }
582
583    uint64_t tiov_base = xc->getSyscallArg(1);
584    size_t count = xc->getSyscallArg(2);
585    struct iovec hiov[count];
586    for (int i = 0; i < count; ++i)
587    {
588        typename OS::tgt_iovec tiov;
589        xc->mem->access(Read, tiov_base + i*sizeof(typename OS::tgt_iovec),
590                        &tiov, sizeof(typename OS::tgt_iovec));
591        hiov[i].iov_len = tiov.iov_len;
592        hiov[i].iov_base = new char [hiov[i].iov_len];
593        xc->mem->access(Read, tiov.iov_base,
594                        hiov[i].iov_base, hiov[i].iov_len);
595    }
596
597    int result = writev(process->sim_fd(fd), hiov, count);
598
599    for (int i = 0; i < count; ++i)
600    {
601        delete [] (char *)hiov[i].iov_base;
602    }
603
604    if (result < 0)
605        return errno;
606
607    return 0;
608}
609
610
611/// Target mmap() handler.
612///
613/// We don't really handle mmap().  If the target is mmaping an
614/// anonymous region or /dev/zero, we can get away with doing basically
615/// nothing (since memory is initialized to zero and the simulator
616/// doesn't really check addresses anyway).  Always print a warning,
617/// since this could be seriously broken if we're not mapping
618/// /dev/zero.
619//
620/// Someday we should explicitly check for /dev/zero in open, flag the
621/// file descriptor, and fail (or implement!) a non-anonymous mmap to
622/// anything else.
623template <class OS>
624SyscallReturn
625mmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
626{
627    Addr start = xc->getSyscallArg(0);
628    uint64_t length = xc->getSyscallArg(1);
629    // int prot = xc->getSyscallArg(2);
630    int flags = xc->getSyscallArg(3);
631    // int fd = p->sim_fd(xc->getSyscallArg(4));
632    // int offset = xc->getSyscallArg(5);
633
634    if (start == 0) {
635        // user didn't give an address... pick one from our "mmap region"
636        start = p->mmap_end;
637        p->mmap_end += roundUp(length, VMPageSize);
638        if (p->nxm_start != 0) {
639            //If we have an nxm space, make sure we haven't colided
640            assert(p->mmap_end < p->nxm_start);
641        }
642    }
643
644    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
645        warn("allowing mmap of file @ fd %d. "
646             "This will break if not /dev/zero.", xc->getSyscallArg(4));
647    }
648
649    return start;
650}
651
652/// Target getrlimit() handler.
653template <class OS>
654SyscallReturn
655getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
656              ExecContext *xc)
657{
658    unsigned resource = xc->getSyscallArg(0);
659    TypedBufferArg<typename OS::rlimit> rlp(xc->getSyscallArg(1));
660
661    switch (resource) {
662      case OS::RLIMIT_STACK:
663        // max stack size in bytes: make up a number (2MB for now)
664        rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
665        break;
666
667      default:
668        std::cerr << "getrlimitFunc: unimplemented resource " << resource
669                  << std::endl;
670        abort();
671        break;
672    }
673
674    rlp.copyOut(xc->mem);
675    return 0;
676}
677
678/// Target gettimeofday() handler.
679template <class OS>
680SyscallReturn
681gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
682                 ExecContext *xc)
683{
684    TypedBufferArg<typename OS::timeval> tp(xc->getSyscallArg(0));
685
686    getElapsedTime(tp->tv_sec, tp->tv_usec);
687    tp->tv_sec += seconds_since_epoch;
688
689    tp.copyOut(xc->mem);
690
691    return 0;
692}
693
694
695/// Target utimes() handler.
696template <class OS>
697SyscallReturn
698utimesFunc(SyscallDesc *desc, int callnum, Process *process,
699           ExecContext *xc)
700{
701    std::string path;
702
703    if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
704        return -EFAULT;
705
706    TypedBufferArg<typename OS::timeval [2]> tp(xc->getSyscallArg(1));
707    tp.copyIn(xc->mem);
708
709    struct timeval hostTimeval[2];
710    for (int i = 0; i < 2; ++i)
711    {
712        hostTimeval[i].tv_sec = (*tp)[i].tv_sec;
713        hostTimeval[i].tv_usec = (*tp)[i].tv_usec;
714    }
715    int result = utimes(path.c_str(), hostTimeval);
716
717    if (result < 0)
718        return -errno;
719
720    return 0;
721}
722
723/// Target getrusage() function.
724template <class OS>
725SyscallReturn
726getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
727              ExecContext *xc)
728{
729    int who = xc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
730    TypedBufferArg<typename OS::rusage> rup(xc->getSyscallArg(1));
731
732    if (who != OS::RUSAGE_SELF) {
733        // don't really handle THREAD or CHILDREN, but just warn and
734        // plow ahead
735        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
736             who);
737    }
738
739    getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
740    rup->ru_stime.tv_sec = 0;
741    rup->ru_stime.tv_usec = 0;
742    rup->ru_maxrss = 0;
743    rup->ru_ixrss = 0;
744    rup->ru_idrss = 0;
745    rup->ru_isrss = 0;
746    rup->ru_minflt = 0;
747    rup->ru_majflt = 0;
748    rup->ru_nswap = 0;
749    rup->ru_inblock = 0;
750    rup->ru_oublock = 0;
751    rup->ru_msgsnd = 0;
752    rup->ru_msgrcv = 0;
753    rup->ru_nsignals = 0;
754    rup->ru_nvcsw = 0;
755    rup->ru_nivcsw = 0;
756
757    rup.copyOut(xc->mem);
758
759    return 0;
760}
761
762#endif // __SIM_SYSCALL_EMUL_HH__
763