syscall_emul.hh revision 2238 
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#define BSD_HOST (defined(__APPLE__) || defined(__OpenBSD__) || \
33                  defined(__FreeBSD__))
34
35///
36/// @file syscall_emul.hh
37///
38/// This file defines objects used to emulate syscalls from the target
39/// application on the host machine.
40
41#include <errno.h>
42#include <string>
43#ifdef __CYGWIN32__
44#include <sys/fcntl.h>	// for O_BINARY
45#endif
46#include <sys/uio.h>
47
48#include "base/intmath.hh"	// for RoundUp
49#include "mem/functional/functional.hh"
50#include "arch/isa_traits.hh"	// for Addr
51
52#include "base/trace.hh"
53#include "cpu/exec_context.hh"
54#include "sim/process.hh"
55
56///
57/// System call descriptor.
58///
59class SyscallDesc {
60
61  public:
62
63    /// Typedef for target syscall handler functions.
64    typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
65                           Process *, ExecContext *);
66
67    const char *name;	//!< Syscall name (e.g., "open").
68    FuncPtr funcPtr;	//!< Pointer to emulation function.
69    int flags;		//!< Flags (see Flags enum).
70
71    /// Flag values for controlling syscall behavior.
72    enum Flags {
73        /// Don't set return regs according to funcPtr return value.
74        /// Used for syscalls with non-standard return conventions
75        /// that explicitly set the ExecContext regs (e.g.,
76        /// sigreturn).
77        SuppressReturnValue = 1
78    };
79
80    /// Constructor.
81    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
82        : name(_name), funcPtr(_funcPtr), flags(_flags)
83    {
84    }
85
86    /// Emulate the syscall.  Public interface for calling through funcPtr.
87    void doSyscall(int callnum, Process *proc, ExecContext *xc);
88};
89
90
91class BaseBufferArg {
92
93  public:
94
95    BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
96    {
97        bufPtr = new uint8_t[size];
98        // clear out buffer: in case we only partially populate this,
99        // and then do a copyOut(), we want to make sure we don't
100        // introduce any random junk into the simulated address space
101        memset(bufPtr, 0, size);
102    }
103
104    virtual ~BaseBufferArg() { delete [] bufPtr; }
105
106    //
107    // copy data into simulator space (read from target memory)
108    //
109    virtual bool copyIn(FunctionalMemory *mem)
110    {
111        mem->access(Read, addr, bufPtr, size);
112        return true;	// no EFAULT detection for now
113    }
114
115    //
116    // copy data out of simulator space (write to target memory)
117    //
118    virtual bool copyOut(FunctionalMemory *mem)
119    {
120        mem->access(Write, addr, bufPtr, size);
121        return true;	// no EFAULT detection for now
122    }
123
124  protected:
125    Addr addr;
126    int size;
127    uint8_t *bufPtr;
128};
129
130
131class BufferArg : public BaseBufferArg
132{
133  public:
134    BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
135    void *bufferPtr()	{ return bufPtr; }
136};
137
138template <class T>
139class TypedBufferArg : public BaseBufferArg
140{
141  public:
142    // user can optionally specify a specific number of bytes to
143    // allocate to deal with those structs that have variable-size
144    // arrays at the end
145    TypedBufferArg(Addr _addr, int _size = sizeof(T))
146        : BaseBufferArg(_addr, _size)
147    { }
148
149    // type case
150    operator T*() { return (T *)bufPtr; }
151
152    // dereference operators
153    T &operator*()	 { return *((T *)bufPtr); }
154    T* operator->()	 { return (T *)bufPtr; }
155    T &operator[](int i) { return ((T *)bufPtr)[i]; }
156};
157
158//////////////////////////////////////////////////////////////////////
159//
160// The following emulation functions are generic enough that they
161// don't need to be recompiled for different emulated OS's.  They are
162// defined in sim/syscall_emul.cc.
163//
164//////////////////////////////////////////////////////////////////////
165
166
167/// Handler for unimplemented syscalls that we haven't thought about.
168SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
169                                Process *p, ExecContext *xc);
170
171/// Handler for unimplemented syscalls that we never intend to
172/// implement (signal handling, etc.) and should not affect the correct
173/// behavior of the program.  Print a warning only if the appropriate
174/// trace flag is enabled.  Return success to the target program.
175SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
176                         Process *p, ExecContext *xc);
177
178/// Target exit() handler: terminate simulation.
179SyscallReturn exitFunc(SyscallDesc *desc, int num,
180                       Process *p, ExecContext *xc);
181
182/// Target getpagesize() handler.
183SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
184                              Process *p, ExecContext *xc);
185
186/// Target obreak() handler: set brk address.
187SyscallReturn obreakFunc(SyscallDesc *desc, int num,
188                         Process *p, ExecContext *xc);
189
190/// Target close() handler.
191SyscallReturn closeFunc(SyscallDesc *desc, int num,
192                        Process *p, ExecContext *xc);
193
194/// Target read() handler.
195SyscallReturn readFunc(SyscallDesc *desc, int num,
196                       Process *p, ExecContext *xc);
197
198/// Target write() handler.
199SyscallReturn writeFunc(SyscallDesc *desc, int num,
200                        Process *p, ExecContext *xc);
201
202/// Target lseek() handler.
203SyscallReturn lseekFunc(SyscallDesc *desc, int num,
204                        Process *p, ExecContext *xc);
205
206/// Target munmap() handler.
207SyscallReturn munmapFunc(SyscallDesc *desc, int num,
208                         Process *p, ExecContext *xc);
209
210/// Target gethostname() handler.
211SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
212                              Process *p, ExecContext *xc);
213
214/// Target unlink() handler.
215SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
216                         Process *p, ExecContext *xc);
217
218/// Target rename() handler.
219SyscallReturn renameFunc(SyscallDesc *desc, int num,
220                         Process *p, ExecContext *xc);
221
222
223/// Target truncate() handler.
224SyscallReturn truncateFunc(SyscallDesc *desc, int num,
225                           Process *p, ExecContext *xc);
226
227
228/// Target ftruncate() handler.
229SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
230                            Process *p, ExecContext *xc);
231
232
233/// Target chown() handler.
234SyscallReturn chownFunc(SyscallDesc *desc, int num,
235                        Process *p, ExecContext *xc);
236
237
238/// Target fchown() handler.
239SyscallReturn fchownFunc(SyscallDesc *desc, int num,
240                         Process *p, ExecContext *xc);
241
242/// Target fnctl() handler.
243SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
244                        Process *process, ExecContext *xc);
245
246/// Target setuid() handler.
247SyscallReturn setuidFunc(SyscallDesc *desc, int num,
248                               Process *p, ExecContext *xc);
249
250/// Target getpid() handler.
251SyscallReturn getpidFunc(SyscallDesc *desc, int num,
252                               Process *p, ExecContext *xc);
253
254/// Target getuid() handler.
255SyscallReturn getuidFunc(SyscallDesc *desc, int num,
256                               Process *p, ExecContext *xc);
257
258/// Target getgid() handler.
259SyscallReturn getgidFunc(SyscallDesc *desc, int num,
260                               Process *p, ExecContext *xc);
261
262/// Target getppid() handler.
263SyscallReturn getppidFunc(SyscallDesc *desc, int num,
264                               Process *p, ExecContext *xc);
265
266/// Target geteuid() handler.
267SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
268                               Process *p, ExecContext *xc);
269
270/// Target getegid() handler.
271SyscallReturn getegidFunc(SyscallDesc *desc, int num,
272                               Process *p, ExecContext *xc);
273
274
275
276/// Pseudo Funcs  - These functions use a different return convension,
277/// returning a second value in a register other than the normal return register
278SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
279                             Process *process, ExecContext *xc);
280
281/// Target getpidPseudo() handler.
282SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
283                               Process *p, ExecContext *xc);
284
285/// Target getuidPseudo() handler.
286SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
287                               Process *p, ExecContext *xc);
288
289/// Target getgidPseudo() handler.
290SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
291                               Process *p, ExecContext *xc);
292
293
294/// This struct is used to build an target-OS-dependent table that
295/// maps the target's open() flags to the host open() flags.
296struct OpenFlagTransTable {
297    int tgtFlag;	//!< Target system flag value.
298    int hostFlag;	//!< Corresponding host system flag value.
299};
300
301
302
303/// A readable name for 1,000,000, for converting microseconds to seconds.
304const int one_million = 1000000;
305
306/// Approximate seconds since the epoch (1/1/1970).  About a billion,
307/// by my reckoning.  We want to keep this a constant (not use the
308/// real-world time) to keep simulations repeatable.
309const unsigned seconds_since_epoch = 1000000000;
310
311/// Helper function to convert current elapsed time to seconds and
312/// microseconds.
313template <class T1, class T2>
314void
315getElapsedTime(T1 &sec, T2 &usec)
316{
317    int elapsed_usecs = curTick / Clock::Int::us;
318    sec = elapsed_usecs / one_million;
319    usec = elapsed_usecs % one_million;
320}
321
322//////////////////////////////////////////////////////////////////////
323//
324// The following emulation functions are generic, but need to be
325// templated to account for differences in types, constants, etc.
326//
327//////////////////////////////////////////////////////////////////////
328
329/// Target ioctl() handler.  For the most part, programs call ioctl()
330/// only to find out if their stdout is a tty, to determine whether to
331/// do line or block buffering.
332template <class OS>
333SyscallReturn
334ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
335          ExecContext *xc)
336{
337    int fd = xc->getSyscallArg(0);
338    unsigned req = xc->getSyscallArg(1);
339
340    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
341
342    if (fd < 0 || process->sim_fd(fd) < 0) {
343        // doesn't map to any simulator fd: not a valid target fd
344        return -EBADF;
345    }
346
347    switch (req) {
348      case OS::TIOCISATTY:
349      case OS::TIOCGETP:
350      case OS::TIOCSETP:
351      case OS::TIOCSETN:
352      case OS::TIOCSETC:
353      case OS::TIOCGETC:
354      case OS::TIOCGETS:
355      case OS::TIOCGETA:
356        return -ENOTTY;
357
358      default:
359        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
360              fd, req, xc->readPC());
361    }
362}
363
364/// Target open() handler.
365template <class OS>
366SyscallReturn
367openFunc(SyscallDesc *desc, int callnum, Process *process,
368         ExecContext *xc)
369{
370    std::string path;
371
372    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
373        return -EFAULT;
374
375    if (path == "/dev/sysdev0") {
376        // This is a memory-mapped high-resolution timer device on Alpha.
377        // We don't support it, so just punt.
378        warn("Ignoring open(%s, ...)\n", path);
379        return -ENOENT;
380    }
381
382    int tgtFlags = xc->getSyscallArg(1);
383    int mode = xc->getSyscallArg(2);
384    int hostFlags = 0;
385
386    // translate open flags
387    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
388        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
389            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
390            hostFlags |= OS::openFlagTable[i].hostFlag;
391        }
392    }
393
394    // any target flags left?
395    if (tgtFlags != 0)
396        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
397
398#ifdef __CYGWIN32__
399    hostFlags |= O_BINARY;
400#endif
401
402    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
403
404    // open the file
405    int fd = open(path.c_str(), hostFlags, mode);
406
407    return (fd == -1) ? -errno : process->alloc_fd(fd);
408}
409
410
411/// Target chmod() handler.
412template <class OS>
413SyscallReturn
414chmodFunc(SyscallDesc *desc, int callnum, Process *process,
415          ExecContext *xc)
416{
417    std::string path;
418
419    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
420        return -EFAULT;
421
422    uint32_t mode = xc->getSyscallArg(1);
423    mode_t hostMode = 0;
424
425    // XXX translate mode flags via OS::something???
426    hostMode = mode;
427
428    // do the chmod
429    int result = chmod(path.c_str(), hostMode);
430    if (result < 0)
431        return -errno;
432
433    return 0;
434}
435
436
437/// Target fchmod() handler.
438template <class OS>
439SyscallReturn
440fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
441           ExecContext *xc)
442{
443    int fd = xc->getSyscallArg(0);
444    if (fd < 0 || process->sim_fd(fd) < 0) {
445        // doesn't map to any simulator fd: not a valid target fd
446        return -EBADF;
447    }
448
449    uint32_t mode = xc->getSyscallArg(1);
450    mode_t hostMode = 0;
451
452    // XXX translate mode flags via OS::someting???
453    hostMode = mode;
454
455    // do the fchmod
456    int result = fchmod(process->sim_fd(fd), hostMode);
457    if (result < 0)
458        return -errno;
459
460    return 0;
461}
462
463
464/// Target stat() handler.
465template <class OS>
466SyscallReturn
467statFunc(SyscallDesc *desc, int callnum, Process *process,
468         ExecContext *xc)
469{
470    std::string path;
471
472    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
473        return -EFAULT;
474
475    struct stat hostBuf;
476    int result = stat(path.c_str(), &hostBuf);
477
478    if (result < 0)
479        return -errno;
480
481    OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
482
483    return 0;
484}
485
486
487/// Target fstat64() handler.
488template <class OS>
489SyscallReturn
490fstat64Func(SyscallDesc *desc, int callnum, Process *process,
491            ExecContext *xc)
492{
493    int fd = xc->getSyscallArg(0);
494    if (fd < 0 || process->sim_fd(fd) < 0) {
495        // doesn't map to any simulator fd: not a valid target fd
496        return -EBADF;
497    }
498
499#if BSD_HOST
500    struct stat  hostBuf;
501    int result = fstat(process->sim_fd(fd), &hostBuf);
502#else
503    struct stat64  hostBuf;
504    int result = fstat64(process->sim_fd(fd), &hostBuf);
505#endif
506
507    if (result < 0)
508        return -errno;
509
510    OS::copyOutStat64Buf(xc->mem, fd, xc->getSyscallArg(1), &hostBuf);
511
512    return 0;
513}
514
515
516/// Target lstat() handler.
517template <class OS>
518SyscallReturn
519lstatFunc(SyscallDesc *desc, int callnum, Process *process,
520          ExecContext *xc)
521{
522    std::string path;
523
524    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
525        return -EFAULT;
526
527    struct stat hostBuf;
528    int result = lstat(path.c_str(), &hostBuf);
529
530    if (result < 0)
531        return -errno;
532
533    OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
534
535    return 0;
536}
537
538/// Target lstat64() handler.
539template <class OS>
540SyscallReturn
541lstat64Func(SyscallDesc *desc, int callnum, Process *process,
542            ExecContext *xc)
543{
544    std::string path;
545
546    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
547        return -EFAULT;
548
549#if BSD_HOST
550    struct stat hostBuf;
551    int result = lstat(path.c_str(), &hostBuf);
552#else
553    struct stat64 hostBuf;
554    int result = lstat64(path.c_str(), &hostBuf);
555#endif
556
557    if (result < 0)
558        return -errno;
559
560    OS::copyOutStat64Buf(xc->mem, -1, xc->getSyscallArg(1), &hostBuf);
561
562    return 0;
563}
564
565/// Target fstat() handler.
566template <class OS>
567SyscallReturn
568fstatFunc(SyscallDesc *desc, int callnum, Process *process,
569          ExecContext *xc)
570{
571    int fd = process->sim_fd(xc->getSyscallArg(0));
572
573    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
574
575    if (fd < 0)
576        return -EBADF;
577
578    struct stat hostBuf;
579    int result = fstat(fd, &hostBuf);
580
581    if (result < 0)
582        return -errno;
583
584    OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
585    return 0;
586}
587
588
589/// Target statfs() handler.
590template <class OS>
591SyscallReturn
592statfsFunc(SyscallDesc *desc, int callnum, Process *process,
593           ExecContext *xc)
594{
595    std::string path;
596
597    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
598        return -EFAULT;
599
600    struct statfs hostBuf;
601    int result = statfs(path.c_str(), &hostBuf);
602
603    if (result < 0)
604        return -errno;
605
606    OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
607
608    return 0;
609}
610
611
612/// Target fstatfs() handler.
613template <class OS>
614SyscallReturn
615fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
616            ExecContext *xc)
617{
618    int fd = process->sim_fd(xc->getSyscallArg(0));
619
620    if (fd < 0)
621        return -EBADF;
622
623    struct statfs hostBuf;
624    int result = fstatfs(fd, &hostBuf);
625
626    if (result < 0)
627        return -errno;
628
629    OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
630
631    return 0;
632}
633
634
635/// Target writev() handler.
636template <class OS>
637SyscallReturn
638writevFunc(SyscallDesc *desc, int callnum, Process *process,
639           ExecContext *xc)
640{
641    int fd = xc->getSyscallArg(0);
642    if (fd < 0 || process->sim_fd(fd) < 0) {
643        // doesn't map to any simulator fd: not a valid target fd
644        return -EBADF;
645    }
646
647    uint64_t tiov_base = xc->getSyscallArg(1);
648    size_t count = xc->getSyscallArg(2);
649    struct iovec hiov[count];
650    for (int i = 0; i < count; ++i)
651    {
652        typename OS::tgt_iovec tiov;
653        xc->mem->access(Read, tiov_base + i*sizeof(typename OS::tgt_iovec),
654                        &tiov, sizeof(typename OS::tgt_iovec));
655        hiov[i].iov_len = gtoh(tiov.iov_len);
656        hiov[i].iov_base = new char [hiov[i].iov_len];
657        xc->mem->access(Read, gtoh(tiov.iov_base),
658                        hiov[i].iov_base, hiov[i].iov_len);
659    }
660
661    int result = writev(process->sim_fd(fd), hiov, count);
662
663    for (int i = 0; i < count; ++i)
664    {
665        delete [] (char *)hiov[i].iov_base;
666    }
667
668    if (result < 0)
669        return -errno;
670
671    return 0;
672}
673
674
675/// Target mmap() handler.
676///
677/// We don't really handle mmap().  If the target is mmaping an
678/// anonymous region or /dev/zero, we can get away with doing basically
679/// nothing (since memory is initialized to zero and the simulator
680/// doesn't really check addresses anyway).  Always print a warning,
681/// since this could be seriously broken if we're not mapping
682/// /dev/zero.
683//
684/// Someday we should explicitly check for /dev/zero in open, flag the
685/// file descriptor, and fail (or implement!) a non-anonymous mmap to
686/// anything else.
687template <class OS>
688SyscallReturn
689mmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
690{
691    Addr start = xc->getSyscallArg(0);
692    uint64_t length = xc->getSyscallArg(1);
693    // int prot = xc->getSyscallArg(2);
694    int flags = xc->getSyscallArg(3);
695    // int fd = p->sim_fd(xc->getSyscallArg(4));
696    // int offset = xc->getSyscallArg(5);
697
698    if (start == 0) {
699        // user didn't give an address... pick one from our "mmap region"
700        start = p->mmap_end;
701        p->mmap_end += roundUp(length, TheISA::VMPageSize);
702        if (p->nxm_start != 0) {
703            //If we have an nxm space, make sure we haven't colided
704            assert(p->mmap_end < p->nxm_start);
705        }
706    }
707
708    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
709        warn("allowing mmap of file @ fd %d. "
710             "This will break if not /dev/zero.", xc->getSyscallArg(4));
711    }
712
713    return start;
714}
715
716/// Target getrlimit() handler.
717template <class OS>
718SyscallReturn
719getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
720        ExecContext *xc)
721{
722    unsigned resource = xc->getSyscallArg(0);
723    TypedBufferArg<typename OS::rlimit> rlp(xc->getSyscallArg(1));
724
725    switch (resource) {
726        case OS::TGT_RLIMIT_STACK:
727            // max stack size in bytes: make up a number (2MB for now)
728            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
729            rlp->rlim_cur = htog(rlp->rlim_cur);
730            rlp->rlim_max = htog(rlp->rlim_max);
731            break;
732
733        default:
734            std::cerr << "getrlimitFunc: unimplemented resource " << resource
735                << std::endl;
736            abort();
737            break;
738    }
739
740    rlp.copyOut(xc->mem);
741    return 0;
742}
743
744/// Target gettimeofday() handler.
745template <class OS>
746SyscallReturn
747gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
748        ExecContext *xc)
749{
750    TypedBufferArg<typename OS::timeval> tp(xc->getSyscallArg(0));
751
752    getElapsedTime(tp->tv_sec, tp->tv_usec);
753    tp->tv_sec += seconds_since_epoch;
754    tp->tv_sec = htog(tp->tv_sec);
755    tp->tv_usec = htog(tp->tv_usec);
756
757    tp.copyOut(xc->mem);
758
759    return 0;
760}
761
762
763/// Target utimes() handler.
764template <class OS>
765SyscallReturn
766utimesFunc(SyscallDesc *desc, int callnum, Process *process,
767           ExecContext *xc)
768{
769    std::string path;
770
771    if (xc->mem->readString(path, xc->getSyscallArg(0)) != NoFault)
772        return -EFAULT;
773
774    TypedBufferArg<typename OS::timeval [2]> tp(xc->getSyscallArg(1));
775    tp.copyIn(xc->mem);
776
777    struct timeval hostTimeval[2];
778    for (int i = 0; i < 2; ++i)
779    {
780        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
781        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
782    }
783    int result = utimes(path.c_str(), hostTimeval);
784
785    if (result < 0)
786        return -errno;
787
788    return 0;
789}
790/// Target getrusage() function.
791template <class OS>
792SyscallReturn
793getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
794              ExecContext *xc)
795{
796    int who = xc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
797    TypedBufferArg<typename OS::rusage> rup(xc->getSyscallArg(1));
798
799    if (who != OS::TGT_RUSAGE_SELF) {
800        // don't really handle THREAD or CHILDREN, but just warn and
801        // plow ahead
802        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
803             who);
804    }
805
806    getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
807    rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
808    rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
809
810    rup->ru_stime.tv_sec = 0;
811    rup->ru_stime.tv_usec = 0;
812    rup->ru_maxrss = 0;
813    rup->ru_ixrss = 0;
814    rup->ru_idrss = 0;
815    rup->ru_isrss = 0;
816    rup->ru_minflt = 0;
817    rup->ru_majflt = 0;
818    rup->ru_nswap = 0;
819    rup->ru_inblock = 0;
820    rup->ru_oublock = 0;
821    rup->ru_msgsnd = 0;
822    rup->ru_msgrcv = 0;
823    rup->ru_nsignals = 0;
824    rup->ru_nvcsw = 0;
825    rup->ru_nivcsw = 0;
826
827    rup.copyOut(xc->mem);
828
829    return 0;
830}
831
832#endif // __SIM_SYSCALL_EMUL_HH__
833