syscall_emul.hh revision 2680 
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 * Authors: Steve Reinhardt
29 *          Kevin Lim
30 */
31
32#ifndef __SIM_SYSCALL_EMUL_HH__
33#define __SIM_SYSCALL_EMUL_HH__
34
35#define BSD_HOST (defined(__APPLE__) || defined(__OpenBSD__) || \
36                  defined(__FreeBSD__))
37
38///
39/// @file syscall_emul.hh
40///
41/// This file defines objects used to emulate syscalls from the target
42/// application on the host machine.
43
44#include <errno.h>
45#include <string>
46#ifdef __CYGWIN32__
47#include <sys/fcntl.h>	// for O_BINARY
48#endif
49#include <sys/uio.h>
50
51#include "arch/isa_traits.hh"	// for Addr
52#include "base/chunk_generator.hh"
53#include "base/intmath.hh"	// for RoundUp
54#include "base/misc.hh"
55#include "base/trace.hh"
56#include "cpu/base.hh"
57#include "cpu/thread_context.hh"
58#include "mem/translating_port.hh"
59#include "mem/page_table.hh"
60#include "sim/process.hh"
61
62///
63/// System call descriptor.
64///
65class SyscallDesc {
66
67  public:
68
69    /// Typedef for target syscall handler functions.
70    typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
71                           Process *, ThreadContext *);
72
73    const char *name;	//!< Syscall name (e.g., "open").
74    FuncPtr funcPtr;	//!< Pointer to emulation function.
75    int flags;		//!< Flags (see Flags enum).
76
77    /// Flag values for controlling syscall behavior.
78    enum Flags {
79        /// Don't set return regs according to funcPtr return value.
80        /// Used for syscalls with non-standard return conventions
81        /// that explicitly set the ThreadContext regs (e.g.,
82        /// sigreturn).
83        SuppressReturnValue = 1
84    };
85
86    /// Constructor.
87    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
88        : name(_name), funcPtr(_funcPtr), flags(_flags)
89    {
90    }
91
92    /// Emulate the syscall.  Public interface for calling through funcPtr.
93    void doSyscall(int callnum, Process *proc, ThreadContext *tc);
94};
95
96
97class BaseBufferArg {
98
99  public:
100
101    BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
102    {
103        bufPtr = new uint8_t[size];
104        // clear out buffer: in case we only partially populate this,
105        // and then do a copyOut(), we want to make sure we don't
106        // introduce any random junk into the simulated address space
107        memset(bufPtr, 0, size);
108    }
109
110    virtual ~BaseBufferArg() { delete [] bufPtr; }
111
112    //
113    // copy data into simulator space (read from target memory)
114    //
115    virtual bool copyIn(TranslatingPort *memport)
116    {
117        memport->readBlob(addr, bufPtr, size);
118        return true;	// no EFAULT detection for now
119    }
120
121    //
122    // copy data out of simulator space (write to target memory)
123    //
124    virtual bool copyOut(TranslatingPort *memport)
125    {
126        memport->writeBlob(addr, bufPtr, size);
127        return true;	// no EFAULT detection for now
128    }
129
130  protected:
131    Addr addr;
132    int size;
133    uint8_t *bufPtr;
134};
135
136
137class BufferArg : public BaseBufferArg
138{
139  public:
140    BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
141    void *bufferPtr()	{ return bufPtr; }
142};
143
144template <class T>
145class TypedBufferArg : public BaseBufferArg
146{
147  public:
148    // user can optionally specify a specific number of bytes to
149    // allocate to deal with those structs that have variable-size
150    // arrays at the end
151    TypedBufferArg(Addr _addr, int _size = sizeof(T))
152        : BaseBufferArg(_addr, _size)
153    { }
154
155    // type case
156    operator T*() { return (T *)bufPtr; }
157
158    // dereference operators
159    T &operator*()	 { return *((T *)bufPtr); }
160    T* operator->()	 { return (T *)bufPtr; }
161    T &operator[](int i) { return ((T *)bufPtr)[i]; }
162};
163
164//////////////////////////////////////////////////////////////////////
165//
166// The following emulation functions are generic enough that they
167// don't need to be recompiled for different emulated OS's.  They are
168// defined in sim/syscall_emul.cc.
169//
170//////////////////////////////////////////////////////////////////////
171
172
173/// Handler for unimplemented syscalls that we haven't thought about.
174SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
175                                Process *p, ThreadContext *tc);
176
177/// Handler for unimplemented syscalls that we never intend to
178/// implement (signal handling, etc.) and should not affect the correct
179/// behavior of the program.  Print a warning only if the appropriate
180/// trace flag is enabled.  Return success to the target program.
181SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
182                         Process *p, ThreadContext *tc);
183
184/// Target exit() handler: terminate simulation.
185SyscallReturn exitFunc(SyscallDesc *desc, int num,
186                       Process *p, ThreadContext *tc);
187
188/// Target getpagesize() handler.
189SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
190                              Process *p, ThreadContext *tc);
191
192/// Target obreak() handler: set brk address.
193SyscallReturn obreakFunc(SyscallDesc *desc, int num,
194                         Process *p, ThreadContext *tc);
195
196/// Target close() handler.
197SyscallReturn closeFunc(SyscallDesc *desc, int num,
198                        Process *p, ThreadContext *tc);
199
200/// Target read() handler.
201SyscallReturn readFunc(SyscallDesc *desc, int num,
202                       Process *p, ThreadContext *tc);
203
204/// Target write() handler.
205SyscallReturn writeFunc(SyscallDesc *desc, int num,
206                        Process *p, ThreadContext *tc);
207
208/// Target lseek() handler.
209SyscallReturn lseekFunc(SyscallDesc *desc, int num,
210                        Process *p, ThreadContext *tc);
211
212/// Target munmap() handler.
213SyscallReturn munmapFunc(SyscallDesc *desc, int num,
214                         Process *p, ThreadContext *tc);
215
216/// Target gethostname() handler.
217SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
218                              Process *p, ThreadContext *tc);
219
220/// Target unlink() handler.
221SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
222                         Process *p, ThreadContext *tc);
223
224/// Target rename() handler.
225SyscallReturn renameFunc(SyscallDesc *desc, int num,
226                         Process *p, ThreadContext *tc);
227
228
229/// Target truncate() handler.
230SyscallReturn truncateFunc(SyscallDesc *desc, int num,
231                           Process *p, ThreadContext *tc);
232
233
234/// Target ftruncate() handler.
235SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
236                            Process *p, ThreadContext *tc);
237
238
239/// Target chown() handler.
240SyscallReturn chownFunc(SyscallDesc *desc, int num,
241                        Process *p, ThreadContext *tc);
242
243
244/// Target fchown() handler.
245SyscallReturn fchownFunc(SyscallDesc *desc, int num,
246                         Process *p, ThreadContext *tc);
247
248/// Target fnctl() handler.
249SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
250                        Process *process, ThreadContext *tc);
251
252/// Target setuid() handler.
253SyscallReturn setuidFunc(SyscallDesc *desc, int num,
254                               Process *p, ThreadContext *tc);
255
256/// Target getpid() handler.
257SyscallReturn getpidFunc(SyscallDesc *desc, int num,
258                               Process *p, ThreadContext *tc);
259
260/// Target getuid() handler.
261SyscallReturn getuidFunc(SyscallDesc *desc, int num,
262                               Process *p, ThreadContext *tc);
263
264/// Target getgid() handler.
265SyscallReturn getgidFunc(SyscallDesc *desc, int num,
266                               Process *p, ThreadContext *tc);
267
268/// Target getppid() handler.
269SyscallReturn getppidFunc(SyscallDesc *desc, int num,
270                               Process *p, ThreadContext *tc);
271
272/// Target geteuid() handler.
273SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
274                               Process *p, ThreadContext *tc);
275
276/// Target getegid() handler.
277SyscallReturn getegidFunc(SyscallDesc *desc, int num,
278                               Process *p, ThreadContext *tc);
279
280
281
282/// Pseudo Funcs  - These functions use a different return convension,
283/// returning a second value in a register other than the normal return register
284SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
285                             Process *process, ThreadContext *tc);
286
287/// Target getpidPseudo() handler.
288SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
289                               Process *p, ThreadContext *tc);
290
291/// Target getuidPseudo() handler.
292SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
293                               Process *p, ThreadContext *tc);
294
295/// Target getgidPseudo() handler.
296SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
297                               Process *p, ThreadContext *tc);
298
299
300/// This struct is used to build an target-OS-dependent table that
301/// maps the target's open() flags to the host open() flags.
302struct OpenFlagTransTable {
303    int tgtFlag;	//!< Target system flag value.
304    int hostFlag;	//!< Corresponding host system flag value.
305};
306
307
308
309/// A readable name for 1,000,000, for converting microseconds to seconds.
310const int one_million = 1000000;
311
312/// Approximate seconds since the epoch (1/1/1970).  About a billion,
313/// by my reckoning.  We want to keep this a constant (not use the
314/// real-world time) to keep simulations repeatable.
315const unsigned seconds_since_epoch = 1000000000;
316
317/// Helper function to convert current elapsed time to seconds and
318/// microseconds.
319template <class T1, class T2>
320void
321getElapsedTime(T1 &sec, T2 &usec)
322{
323    int elapsed_usecs = curTick / Clock::Int::us;
324    sec = elapsed_usecs / one_million;
325    usec = elapsed_usecs % one_million;
326}
327
328//////////////////////////////////////////////////////////////////////
329//
330// The following emulation functions are generic, but need to be
331// templated to account for differences in types, constants, etc.
332//
333//////////////////////////////////////////////////////////////////////
334
335/// Target ioctl() handler.  For the most part, programs call ioctl()
336/// only to find out if their stdout is a tty, to determine whether to
337/// do line or block buffering.
338template <class OS>
339SyscallReturn
340ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
341          ThreadContext *tc)
342{
343    int fd = tc->getSyscallArg(0);
344    unsigned req = tc->getSyscallArg(1);
345
346    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
347
348    if (fd < 0 || process->sim_fd(fd) < 0) {
349        // doesn't map to any simulator fd: not a valid target fd
350        return -EBADF;
351    }
352
353    switch (req) {
354      case OS::TIOCISATTY:
355      case OS::TIOCGETP:
356      case OS::TIOCSETP:
357      case OS::TIOCSETN:
358      case OS::TIOCSETC:
359      case OS::TIOCGETC:
360      case OS::TIOCGETS:
361      case OS::TIOCGETA:
362        return -ENOTTY;
363
364      default:
365        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
366              fd, req, tc->readPC());
367    }
368}
369
370/// Target open() handler.
371template <class OS>
372SyscallReturn
373openFunc(SyscallDesc *desc, int callnum, Process *process,
374         ThreadContext *tc)
375{
376    std::string path;
377
378    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
379        return -EFAULT;
380
381    if (path == "/dev/sysdev0") {
382        // This is a memory-mapped high-resolution timer device on Alpha.
383        // We don't support it, so just punt.
384        warn("Ignoring open(%s, ...)\n", path);
385        return -ENOENT;
386    }
387
388    int tgtFlags = tc->getSyscallArg(1);
389    int mode = tc->getSyscallArg(2);
390    int hostFlags = 0;
391
392    // translate open flags
393    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
394        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
395            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
396            hostFlags |= OS::openFlagTable[i].hostFlag;
397        }
398    }
399
400    // any target flags left?
401    if (tgtFlags != 0)
402        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
403
404#ifdef __CYGWIN32__
405    hostFlags |= O_BINARY;
406#endif
407
408    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
409
410    // open the file
411    int fd = open(path.c_str(), hostFlags, mode);
412
413    return (fd == -1) ? -errno : process->alloc_fd(fd);
414}
415
416
417/// Target chmod() handler.
418template <class OS>
419SyscallReturn
420chmodFunc(SyscallDesc *desc, int callnum, Process *process,
421          ThreadContext *tc)
422{
423    std::string path;
424
425    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
426        return -EFAULT;
427
428    uint32_t mode = tc->getSyscallArg(1);
429    mode_t hostMode = 0;
430
431    // XXX translate mode flags via OS::something???
432    hostMode = mode;
433
434    // do the chmod
435    int result = chmod(path.c_str(), hostMode);
436    if (result < 0)
437        return -errno;
438
439    return 0;
440}
441
442
443/// Target fchmod() handler.
444template <class OS>
445SyscallReturn
446fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
447           ThreadContext *tc)
448{
449    int fd = tc->getSyscallArg(0);
450    if (fd < 0 || process->sim_fd(fd) < 0) {
451        // doesn't map to any simulator fd: not a valid target fd
452        return -EBADF;
453    }
454
455    uint32_t mode = tc->getSyscallArg(1);
456    mode_t hostMode = 0;
457
458    // XXX translate mode flags via OS::someting???
459    hostMode = mode;
460
461    // do the fchmod
462    int result = fchmod(process->sim_fd(fd), hostMode);
463    if (result < 0)
464        return -errno;
465
466    return 0;
467}
468
469
470/// Target stat() handler.
471template <class OS>
472SyscallReturn
473statFunc(SyscallDesc *desc, int callnum, Process *process,
474         ThreadContext *tc)
475{
476    std::string path;
477
478    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
479    return -EFAULT;
480
481    struct stat hostBuf;
482    int result = stat(path.c_str(), &hostBuf);
483
484    if (result < 0)
485        return -errno;
486
487    OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
488
489    return 0;
490}
491
492
493/// Target fstat64() handler.
494template <class OS>
495SyscallReturn
496fstat64Func(SyscallDesc *desc, int callnum, Process *process,
497            ThreadContext *tc)
498{
499    int fd = tc->getSyscallArg(0);
500    if (fd < 0 || process->sim_fd(fd) < 0) {
501        // doesn't map to any simulator fd: not a valid target fd
502        return -EBADF;
503    }
504
505#if BSD_HOST
506    struct stat  hostBuf;
507    int result = fstat(process->sim_fd(fd), &hostBuf);
508#else
509    struct stat64  hostBuf;
510    int result = fstat64(process->sim_fd(fd), &hostBuf);
511#endif
512
513    if (result < 0)
514        return -errno;
515
516    OS::copyOutStat64Buf(tc->getMemPort(), fd, tc->getSyscallArg(1), &hostBuf);
517
518    return 0;
519}
520
521
522/// Target lstat() handler.
523template <class OS>
524SyscallReturn
525lstatFunc(SyscallDesc *desc, int callnum, Process *process,
526          ThreadContext *tc)
527{
528    std::string path;
529
530    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
531      return -EFAULT;
532
533    struct stat hostBuf;
534    int result = lstat(path.c_str(), &hostBuf);
535
536    if (result < 0)
537        return -errno;
538
539    OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
540
541    return 0;
542}
543
544/// Target lstat64() handler.
545template <class OS>
546SyscallReturn
547lstat64Func(SyscallDesc *desc, int callnum, Process *process,
548            ThreadContext *tc)
549{
550    std::string path;
551
552    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
553      return -EFAULT;
554
555#if BSD_HOST
556    struct stat hostBuf;
557    int result = lstat(path.c_str(), &hostBuf);
558#else
559    struct stat64 hostBuf;
560    int result = lstat64(path.c_str(), &hostBuf);
561#endif
562
563    if (result < 0)
564        return -errno;
565
566    OS::copyOutStat64Buf(tc->getMemPort(), -1, tc->getSyscallArg(1), &hostBuf);
567
568    return 0;
569}
570
571/// Target fstat() handler.
572template <class OS>
573SyscallReturn
574fstatFunc(SyscallDesc *desc, int callnum, Process *process,
575          ThreadContext *tc)
576{
577    int fd = process->sim_fd(tc->getSyscallArg(0));
578
579    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
580
581    if (fd < 0)
582        return -EBADF;
583
584    struct stat hostBuf;
585    int result = fstat(fd, &hostBuf);
586
587    if (result < 0)
588        return -errno;
589
590    OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
591
592    return 0;
593}
594
595
596/// Target statfs() handler.
597template <class OS>
598SyscallReturn
599statfsFunc(SyscallDesc *desc, int callnum, Process *process,
600           ThreadContext *tc)
601{
602    std::string path;
603
604    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
605      return -EFAULT;
606
607    struct statfs hostBuf;
608    int result = statfs(path.c_str(), &hostBuf);
609
610    if (result < 0)
611        return -errno;
612
613    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
614
615    return 0;
616}
617
618
619/// Target fstatfs() handler.
620template <class OS>
621SyscallReturn
622fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
623            ThreadContext *tc)
624{
625    int fd = process->sim_fd(tc->getSyscallArg(0));
626
627    if (fd < 0)
628        return -EBADF;
629
630    struct statfs hostBuf;
631    int result = fstatfs(fd, &hostBuf);
632
633    if (result < 0)
634        return -errno;
635
636    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
637
638    return 0;
639}
640
641
642/// Target writev() handler.
643template <class OS>
644SyscallReturn
645writevFunc(SyscallDesc *desc, int callnum, Process *process,
646           ThreadContext *tc)
647{
648    int fd = tc->getSyscallArg(0);
649    if (fd < 0 || process->sim_fd(fd) < 0) {
650        // doesn't map to any simulator fd: not a valid target fd
651        return -EBADF;
652    }
653
654    TranslatingPort *p = tc->getMemPort();
655    uint64_t tiov_base = tc->getSyscallArg(1);
656    size_t count = tc->getSyscallArg(2);
657    struct iovec hiov[count];
658    for (int i = 0; i < count; ++i)
659    {
660        typename OS::tgt_iovec tiov;
661
662        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
663                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
664        hiov[i].iov_len = gtoh(tiov.iov_len);
665        hiov[i].iov_base = new char [hiov[i].iov_len];
666        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
667                    hiov[i].iov_len);
668    }
669
670    int result = writev(process->sim_fd(fd), hiov, count);
671
672    for (int i = 0; i < count; ++i)
673    {
674        delete [] (char *)hiov[i].iov_base;
675    }
676
677    if (result < 0)
678        return -errno;
679
680    return 0;
681}
682
683
684/// Target mmap() handler.
685///
686/// We don't really handle mmap().  If the target is mmaping an
687/// anonymous region or /dev/zero, we can get away with doing basically
688/// nothing (since memory is initialized to zero and the simulator
689/// doesn't really check addresses anyway).  Always print a warning,
690/// since this could be seriously broken if we're not mapping
691/// /dev/zero.
692//
693/// Someday we should explicitly check for /dev/zero in open, flag the
694/// file descriptor, and fail (or implement!) a non-anonymous mmap to
695/// anything else.
696template <class OS>
697SyscallReturn
698mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
699{
700    Addr start = tc->getSyscallArg(0);
701    uint64_t length = tc->getSyscallArg(1);
702    // int prot = tc->getSyscallArg(2);
703    int flags = tc->getSyscallArg(3);
704    // int fd = p->sim_fd(tc->getSyscallArg(4));
705    // int offset = tc->getSyscallArg(5);
706
707    if ((start  % TheISA::VMPageSize) != 0 ||
708        (length % TheISA::VMPageSize) != 0) {
709        warn("mmap failing: arguments not page-aligned: "
710             "start 0x%x length 0x%x",
711             start, length);
712        return -EINVAL;
713    }
714
715    if (start != 0) {
716        warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
717             start, p->mmap_end);
718    }
719
720    // pick next address from our "mmap region"
721    start = p->mmap_end;
722    p->pTable->allocate(start, length);
723    p->mmap_end += length;
724
725    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
726        warn("allowing mmap of file @ fd %d. "
727             "This will break if not /dev/zero.", tc->getSyscallArg(4));
728    }
729
730    return start;
731}
732
733/// Target getrlimit() handler.
734template <class OS>
735SyscallReturn
736getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
737        ThreadContext *tc)
738{
739    unsigned resource = tc->getSyscallArg(0);
740    TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
741
742    switch (resource) {
743        case OS::TGT_RLIMIT_STACK:
744            // max stack size in bytes: make up a number (2MB for now)
745            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
746            rlp->rlim_cur = htog(rlp->rlim_cur);
747            rlp->rlim_max = htog(rlp->rlim_max);
748            break;
749
750        default:
751            std::cerr << "getrlimitFunc: unimplemented resource " << resource
752                << std::endl;
753            abort();
754            break;
755    }
756
757    rlp.copyOut(tc->getMemPort());
758    return 0;
759}
760
761/// Target gettimeofday() handler.
762template <class OS>
763SyscallReturn
764gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
765        ThreadContext *tc)
766{
767    TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
768
769    getElapsedTime(tp->tv_sec, tp->tv_usec);
770    tp->tv_sec += seconds_since_epoch;
771    tp->tv_sec = htog(tp->tv_sec);
772    tp->tv_usec = htog(tp->tv_usec);
773
774    tp.copyOut(tc->getMemPort());
775
776    return 0;
777}
778
779
780/// Target utimes() handler.
781template <class OS>
782SyscallReturn
783utimesFunc(SyscallDesc *desc, int callnum, Process *process,
784           ThreadContext *tc)
785{
786    std::string path;
787
788    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
789      return -EFAULT;
790
791    TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
792    tp.copyIn(tc->getMemPort());
793
794    struct timeval hostTimeval[2];
795    for (int i = 0; i < 2; ++i)
796    {
797        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
798        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
799    }
800    int result = utimes(path.c_str(), hostTimeval);
801
802    if (result < 0)
803        return -errno;
804
805    return 0;
806}
807/// Target getrusage() function.
808template <class OS>
809SyscallReturn
810getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
811              ThreadContext *tc)
812{
813    int who = tc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
814    TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
815
816    if (who != OS::TGT_RUSAGE_SELF) {
817        // don't really handle THREAD or CHILDREN, but just warn and
818        // plow ahead
819        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
820             who);
821    }
822
823    getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
824    rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
825    rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
826
827    rup->ru_stime.tv_sec = 0;
828    rup->ru_stime.tv_usec = 0;
829    rup->ru_maxrss = 0;
830    rup->ru_ixrss = 0;
831    rup->ru_idrss = 0;
832    rup->ru_isrss = 0;
833    rup->ru_minflt = 0;
834    rup->ru_majflt = 0;
835    rup->ru_nswap = 0;
836    rup->ru_inblock = 0;
837    rup->ru_oublock = 0;
838    rup->ru_msgsnd = 0;
839    rup->ru_msgrcv = 0;
840    rup->ru_nsignals = 0;
841    rup->ru_nvcsw = 0;
842    rup->ru_nivcsw = 0;
843
844    rup.copyOut(tc->getMemPort());
845
846    return 0;
847}
848
849
850
851
852#endif // __SIM_SYSCALL_EMUL_HH__
853