syscall_emul.hh revision 3079 
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 NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
36                   defined(__FreeBSD__) || defined(__CYGWIN__))
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 dup() handler.
249SyscallReturn dupFunc(SyscallDesc *desc, int num,
250                      Process *process, ThreadContext *tc);
251
252/// Target fnctl() handler.
253SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
254                        Process *process, ThreadContext *tc);
255
256/// Target fcntl64() handler.
257SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
258                        Process *process, ThreadContext *tc);
259
260/// Target setuid() handler.
261SyscallReturn setuidFunc(SyscallDesc *desc, int num,
262                               Process *p, ThreadContext *tc);
263
264/// Target getpid() handler.
265SyscallReturn getpidFunc(SyscallDesc *desc, int num,
266                               Process *p, ThreadContext *tc);
267
268/// Target getuid() handler.
269SyscallReturn getuidFunc(SyscallDesc *desc, int num,
270                               Process *p, ThreadContext *tc);
271
272/// Target getgid() handler.
273SyscallReturn getgidFunc(SyscallDesc *desc, int num,
274                               Process *p, ThreadContext *tc);
275
276/// Target getppid() handler.
277SyscallReturn getppidFunc(SyscallDesc *desc, int num,
278                               Process *p, ThreadContext *tc);
279
280/// Target geteuid() handler.
281SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
282                               Process *p, ThreadContext *tc);
283
284/// Target getegid() handler.
285SyscallReturn getegidFunc(SyscallDesc *desc, int num,
286                               Process *p, ThreadContext *tc);
287
288
289
290/// Pseudo Funcs  - These functions use a different return convension,
291/// returning a second value in a register other than the normal return register
292SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
293                             Process *process, ThreadContext *tc);
294
295/// Target getpidPseudo() handler.
296SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
297                               Process *p, ThreadContext *tc);
298
299/// Target getuidPseudo() handler.
300SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
301                               Process *p, ThreadContext *tc);
302
303/// Target getgidPseudo() handler.
304SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
305                               Process *p, ThreadContext *tc);
306
307
308/// This struct is used to build an target-OS-dependent table that
309/// maps the target's open() flags to the host open() flags.
310struct OpenFlagTransTable {
311    int tgtFlag;	//!< Target system flag value.
312    int hostFlag;	//!< Corresponding host system flag value.
313};
314
315
316
317/// A readable name for 1,000,000, for converting microseconds to seconds.
318const int one_million = 1000000;
319
320/// Approximate seconds since the epoch (1/1/1970).  About a billion,
321/// by my reckoning.  We want to keep this a constant (not use the
322/// real-world time) to keep simulations repeatable.
323const unsigned seconds_since_epoch = 1000000000;
324
325/// Helper function to convert current elapsed time to seconds and
326/// microseconds.
327template <class T1, class T2>
328void
329getElapsedTime(T1 &sec, T2 &usec)
330{
331    int elapsed_usecs = curTick / Clock::Int::us;
332    sec = elapsed_usecs / one_million;
333    usec = elapsed_usecs % one_million;
334}
335
336//////////////////////////////////////////////////////////////////////
337//
338// The following emulation functions are generic, but need to be
339// templated to account for differences in types, constants, etc.
340//
341//////////////////////////////////////////////////////////////////////
342
343/// Target ioctl() handler.  For the most part, programs call ioctl()
344/// only to find out if their stdout is a tty, to determine whether to
345/// do line or block buffering.
346template <class OS>
347SyscallReturn
348ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
349          ThreadContext *tc)
350{
351    int fd = tc->getSyscallArg(0);
352    unsigned req = tc->getSyscallArg(1);
353
354    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
355
356    if (fd < 0 || process->sim_fd(fd) < 0) {
357        // doesn't map to any simulator fd: not a valid target fd
358        return -EBADF;
359    }
360
361    switch (req) {
362      case OS::TIOCISATTY:
363      case OS::TIOCGETP:
364      case OS::TIOCSETP:
365      case OS::TIOCSETN:
366      case OS::TIOCSETC:
367      case OS::TIOCGETC:
368      case OS::TIOCGETS:
369      case OS::TIOCGETA:
370        return -ENOTTY;
371
372      default:
373        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
374              fd, req, tc->readPC());
375    }
376}
377
378/// Target open() handler.
379template <class OS>
380SyscallReturn
381openFunc(SyscallDesc *desc, int callnum, Process *process,
382         ThreadContext *tc)
383{
384    std::string path;
385
386    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
387        return -EFAULT;
388
389    if (path == "/dev/sysdev0") {
390        // This is a memory-mapped high-resolution timer device on Alpha.
391        // We don't support it, so just punt.
392        warn("Ignoring open(%s, ...)\n", path);
393        return -ENOENT;
394    }
395
396    int tgtFlags = tc->getSyscallArg(1);
397    int mode = tc->getSyscallArg(2);
398    int hostFlags = 0;
399
400    // translate open flags
401    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
402        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
403            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
404            hostFlags |= OS::openFlagTable[i].hostFlag;
405        }
406    }
407
408    // any target flags left?
409    if (tgtFlags != 0)
410        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
411
412#ifdef __CYGWIN32__
413    hostFlags |= O_BINARY;
414#endif
415
416    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
417
418    // open the file
419    int fd = open(path.c_str(), hostFlags, mode);
420
421    return (fd == -1) ? -errno : process->alloc_fd(fd);
422}
423
424
425/// Target chmod() handler.
426template <class OS>
427SyscallReturn
428chmodFunc(SyscallDesc *desc, int callnum, Process *process,
429          ThreadContext *tc)
430{
431    std::string path;
432
433    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
434        return -EFAULT;
435
436    uint32_t mode = tc->getSyscallArg(1);
437    mode_t hostMode = 0;
438
439    // XXX translate mode flags via OS::something???
440    hostMode = mode;
441
442    // do the chmod
443    int result = chmod(path.c_str(), hostMode);
444    if (result < 0)
445        return -errno;
446
447    return 0;
448}
449
450
451/// Target fchmod() handler.
452template <class OS>
453SyscallReturn
454fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
455           ThreadContext *tc)
456{
457    int fd = tc->getSyscallArg(0);
458    if (fd < 0 || process->sim_fd(fd) < 0) {
459        // doesn't map to any simulator fd: not a valid target fd
460        return -EBADF;
461    }
462
463    uint32_t mode = tc->getSyscallArg(1);
464    mode_t hostMode = 0;
465
466    // XXX translate mode flags via OS::someting???
467    hostMode = mode;
468
469    // do the fchmod
470    int result = fchmod(process->sim_fd(fd), hostMode);
471    if (result < 0)
472        return -errno;
473
474    return 0;
475}
476
477
478/// Target stat() handler.
479template <class OS>
480SyscallReturn
481statFunc(SyscallDesc *desc, int callnum, Process *process,
482         ThreadContext *tc)
483{
484    std::string path;
485
486    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
487    return -EFAULT;
488
489    struct stat hostBuf;
490    int result = stat(path.c_str(), &hostBuf);
491
492    if (result < 0)
493        return -errno;
494
495    OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
496
497    return 0;
498}
499
500
501/// Target fstat64() handler.
502template <class OS>
503SyscallReturn
504fstat64Func(SyscallDesc *desc, int callnum, Process *process,
505            ThreadContext *tc)
506{
507    int fd = tc->getSyscallArg(0);
508    if (fd < 0 || process->sim_fd(fd) < 0) {
509        // doesn't map to any simulator fd: not a valid target fd
510        return -EBADF;
511    }
512
513#if NO_STAT64
514    struct stat  hostBuf;
515    int result = fstat(process->sim_fd(fd), &hostBuf);
516#else
517    struct stat64  hostBuf;
518    int result = fstat64(process->sim_fd(fd), &hostBuf);
519#endif
520
521    if (result < 0)
522        return -errno;
523
524    OS::copyOutStat64Buf(tc->getMemPort(), fd, tc->getSyscallArg(1), &hostBuf);
525
526    return 0;
527}
528
529
530/// Target lstat() handler.
531template <class OS>
532SyscallReturn
533lstatFunc(SyscallDesc *desc, int callnum, Process *process,
534          ThreadContext *tc)
535{
536    std::string path;
537
538    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
539      return -EFAULT;
540
541    struct stat hostBuf;
542    int result = lstat(path.c_str(), &hostBuf);
543
544    if (result < 0)
545        return -errno;
546
547    OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
548
549    return 0;
550}
551
552/// Target lstat64() handler.
553template <class OS>
554SyscallReturn
555lstat64Func(SyscallDesc *desc, int callnum, Process *process,
556            ThreadContext *tc)
557{
558    std::string path;
559
560    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
561      return -EFAULT;
562
563#if NO_STAT64
564    struct stat hostBuf;
565    int result = lstat(path.c_str(), &hostBuf);
566#else
567    struct stat64 hostBuf;
568    int result = lstat64(path.c_str(), &hostBuf);
569#endif
570
571    if (result < 0)
572        return -errno;
573
574    OS::copyOutStat64Buf(tc->getMemPort(), -1, tc->getSyscallArg(1), &hostBuf);
575
576    return 0;
577}
578
579/// Target fstat() handler.
580template <class OS>
581SyscallReturn
582fstatFunc(SyscallDesc *desc, int callnum, Process *process,
583          ThreadContext *tc)
584{
585    int fd = process->sim_fd(tc->getSyscallArg(0));
586
587    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
588
589    if (fd < 0)
590        return -EBADF;
591
592    struct stat hostBuf;
593    int result = fstat(fd, &hostBuf);
594
595    if (result < 0)
596        return -errno;
597
598    OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
599
600    return 0;
601}
602
603
604/// Target statfs() handler.
605template <class OS>
606SyscallReturn
607statfsFunc(SyscallDesc *desc, int callnum, Process *process,
608           ThreadContext *tc)
609{
610    std::string path;
611
612    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
613      return -EFAULT;
614
615    struct statfs hostBuf;
616    int result = statfs(path.c_str(), &hostBuf);
617
618    if (result < 0)
619        return -errno;
620
621    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
622
623    return 0;
624}
625
626
627/// Target fstatfs() handler.
628template <class OS>
629SyscallReturn
630fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
631            ThreadContext *tc)
632{
633    int fd = process->sim_fd(tc->getSyscallArg(0));
634
635    if (fd < 0)
636        return -EBADF;
637
638    struct statfs hostBuf;
639    int result = fstatfs(fd, &hostBuf);
640
641    if (result < 0)
642        return -errno;
643
644    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
645
646    return 0;
647}
648
649
650/// Target writev() handler.
651template <class OS>
652SyscallReturn
653writevFunc(SyscallDesc *desc, int callnum, Process *process,
654           ThreadContext *tc)
655{
656    int fd = tc->getSyscallArg(0);
657    if (fd < 0 || process->sim_fd(fd) < 0) {
658        // doesn't map to any simulator fd: not a valid target fd
659        return -EBADF;
660    }
661
662    TranslatingPort *p = tc->getMemPort();
663    uint64_t tiov_base = tc->getSyscallArg(1);
664    size_t count = tc->getSyscallArg(2);
665    struct iovec hiov[count];
666    for (int i = 0; i < count; ++i)
667    {
668        typename OS::tgt_iovec tiov;
669
670        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
671                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
672        hiov[i].iov_len = gtoh(tiov.iov_len);
673        hiov[i].iov_base = new char [hiov[i].iov_len];
674        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
675                    hiov[i].iov_len);
676    }
677
678    int result = writev(process->sim_fd(fd), hiov, count);
679
680    for (int i = 0; i < count; ++i)
681    {
682        delete [] (char *)hiov[i].iov_base;
683    }
684
685    if (result < 0)
686        return -errno;
687
688    return 0;
689}
690
691
692/// Target mmap() handler.
693///
694/// We don't really handle mmap().  If the target is mmaping an
695/// anonymous region or /dev/zero, we can get away with doing basically
696/// nothing (since memory is initialized to zero and the simulator
697/// doesn't really check addresses anyway).  Always print a warning,
698/// since this could be seriously broken if we're not mapping
699/// /dev/zero.
700//
701/// Someday we should explicitly check for /dev/zero in open, flag the
702/// file descriptor, and fail (or implement!) a non-anonymous mmap to
703/// anything else.
704template <class OS>
705SyscallReturn
706mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
707{
708    Addr start = tc->getSyscallArg(0);
709    uint64_t length = tc->getSyscallArg(1);
710    // int prot = tc->getSyscallArg(2);
711    int flags = tc->getSyscallArg(3);
712    // int fd = p->sim_fd(tc->getSyscallArg(4));
713    // int offset = tc->getSyscallArg(5);
714
715    if ((start  % TheISA::VMPageSize) != 0 ||
716        (length % TheISA::VMPageSize) != 0) {
717        warn("mmap failing: arguments not page-aligned: "
718             "start 0x%x length 0x%x",
719             start, length);
720        return -EINVAL;
721    }
722
723    if (start != 0) {
724        warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
725             start, p->mmap_end);
726    }
727
728    // pick next address from our "mmap region"
729    start = p->mmap_end;
730    p->pTable->allocate(start, length);
731    p->mmap_end += length;
732
733    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
734        warn("allowing mmap of file @ fd %d. "
735             "This will break if not /dev/zero.", tc->getSyscallArg(4));
736    }
737
738    return start;
739}
740
741/// Target getrlimit() handler.
742template <class OS>
743SyscallReturn
744getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
745        ThreadContext *tc)
746{
747    unsigned resource = tc->getSyscallArg(0);
748    TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
749
750    switch (resource) {
751        case OS::TGT_RLIMIT_STACK:
752            // max stack size in bytes: make up a number (2MB for now)
753            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
754            rlp->rlim_cur = htog(rlp->rlim_cur);
755            rlp->rlim_max = htog(rlp->rlim_max);
756            break;
757
758        default:
759            std::cerr << "getrlimitFunc: unimplemented resource " << resource
760                << std::endl;
761            abort();
762            break;
763    }
764
765    rlp.copyOut(tc->getMemPort());
766    return 0;
767}
768
769/// Target gettimeofday() handler.
770template <class OS>
771SyscallReturn
772gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
773        ThreadContext *tc)
774{
775    TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
776
777    getElapsedTime(tp->tv_sec, tp->tv_usec);
778    tp->tv_sec += seconds_since_epoch;
779    tp->tv_sec = htog(tp->tv_sec);
780    tp->tv_usec = htog(tp->tv_usec);
781
782    tp.copyOut(tc->getMemPort());
783
784    return 0;
785}
786
787
788/// Target utimes() handler.
789template <class OS>
790SyscallReturn
791utimesFunc(SyscallDesc *desc, int callnum, Process *process,
792           ThreadContext *tc)
793{
794    std::string path;
795
796    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
797      return -EFAULT;
798
799    TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
800    tp.copyIn(tc->getMemPort());
801
802    struct timeval hostTimeval[2];
803    for (int i = 0; i < 2; ++i)
804    {
805        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
806        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
807    }
808    int result = utimes(path.c_str(), hostTimeval);
809
810    if (result < 0)
811        return -errno;
812
813    return 0;
814}
815/// Target getrusage() function.
816template <class OS>
817SyscallReturn
818getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
819              ThreadContext *tc)
820{
821    int who = tc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
822    TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
823
824    if (who != OS::TGT_RUSAGE_SELF) {
825        // don't really handle THREAD or CHILDREN, but just warn and
826        // plow ahead
827        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
828             who);
829    }
830
831    getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
832    rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
833    rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
834
835    rup->ru_stime.tv_sec = 0;
836    rup->ru_stime.tv_usec = 0;
837    rup->ru_maxrss = 0;
838    rup->ru_ixrss = 0;
839    rup->ru_idrss = 0;
840    rup->ru_isrss = 0;
841    rup->ru_minflt = 0;
842    rup->ru_majflt = 0;
843    rup->ru_nswap = 0;
844    rup->ru_inblock = 0;
845    rup->ru_oublock = 0;
846    rup->ru_msgsnd = 0;
847    rup->ru_msgrcv = 0;
848    rup->ru_nsignals = 0;
849    rup->ru_nvcsw = 0;
850    rup->ru_nivcsw = 0;
851
852    rup.copyOut(tc->getMemPort());
853
854    return 0;
855}
856
857
858
859
860#endif // __SIM_SYSCALL_EMUL_HH__
861