syscall_emul.hh revision 3114 
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/stat.h>
50#include <fcntl.h>
51#include <sys/uio.h>
52
53#include "sim/host.hh"	// for Addr
54#include "base/chunk_generator.hh"
55#include "base/intmath.hh"	// for RoundUp
56#include "base/misc.hh"
57#include "base/trace.hh"
58#include "cpu/base.hh"
59#include "cpu/thread_context.hh"
60#include "mem/translating_port.hh"
61#include "mem/page_table.hh"
62#include "sim/process.hh"
63
64///
65/// System call descriptor.
66///
67class SyscallDesc {
68
69  public:
70
71    /// Typedef for target syscall handler functions.
72    typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
73                           LiveProcess *, ThreadContext *);
74
75    const char *name;	//!< Syscall name (e.g., "open").
76    FuncPtr funcPtr;	//!< Pointer to emulation function.
77    int flags;		//!< Flags (see Flags enum).
78
79    /// Flag values for controlling syscall behavior.
80    enum Flags {
81        /// Don't set return regs according to funcPtr return value.
82        /// Used for syscalls with non-standard return conventions
83        /// that explicitly set the ThreadContext regs (e.g.,
84        /// sigreturn).
85        SuppressReturnValue = 1
86    };
87
88    /// Constructor.
89    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
90        : name(_name), funcPtr(_funcPtr), flags(_flags)
91    {
92    }
93
94    /// Emulate the syscall.  Public interface for calling through funcPtr.
95    void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
96};
97
98
99class BaseBufferArg {
100
101  public:
102
103    BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
104    {
105        bufPtr = new uint8_t[size];
106        // clear out buffer: in case we only partially populate this,
107        // and then do a copyOut(), we want to make sure we don't
108        // introduce any random junk into the simulated address space
109        memset(bufPtr, 0, size);
110    }
111
112    virtual ~BaseBufferArg() { delete [] bufPtr; }
113
114    //
115    // copy data into simulator space (read from target memory)
116    //
117    virtual bool copyIn(TranslatingPort *memport)
118    {
119        memport->readBlob(addr, bufPtr, size);
120        return true;	// no EFAULT detection for now
121    }
122
123    //
124    // copy data out of simulator space (write to target memory)
125    //
126    virtual bool copyOut(TranslatingPort *memport)
127    {
128        memport->writeBlob(addr, bufPtr, size);
129        return true;	// no EFAULT detection for now
130    }
131
132  protected:
133    Addr addr;
134    int size;
135    uint8_t *bufPtr;
136};
137
138
139class BufferArg : public BaseBufferArg
140{
141  public:
142    BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
143    void *bufferPtr()	{ return bufPtr; }
144};
145
146template <class T>
147class TypedBufferArg : public BaseBufferArg
148{
149  public:
150    // user can optionally specify a specific number of bytes to
151    // allocate to deal with those structs that have variable-size
152    // arrays at the end
153    TypedBufferArg(Addr _addr, int _size = sizeof(T))
154        : BaseBufferArg(_addr, _size)
155    { }
156
157    // type case
158    operator T*() { return (T *)bufPtr; }
159
160    // dereference operators
161    T &operator*()	 { return *((T *)bufPtr); }
162    T* operator->()	 { return (T *)bufPtr; }
163    T &operator[](int i) { return ((T *)bufPtr)[i]; }
164};
165
166//////////////////////////////////////////////////////////////////////
167//
168// The following emulation functions are generic enough that they
169// don't need to be recompiled for different emulated OS's.  They are
170// defined in sim/syscall_emul.cc.
171//
172//////////////////////////////////////////////////////////////////////
173
174
175/// Handler for unimplemented syscalls that we haven't thought about.
176SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
177                                LiveProcess *p, ThreadContext *tc);
178
179/// Handler for unimplemented syscalls that we never intend to
180/// implement (signal handling, etc.) and should not affect the correct
181/// behavior of the program.  Print a warning only if the appropriate
182/// trace flag is enabled.  Return success to the target program.
183SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
184                         LiveProcess *p, ThreadContext *tc);
185
186/// Target exit() handler: terminate simulation.
187SyscallReturn exitFunc(SyscallDesc *desc, int num,
188                       LiveProcess *p, ThreadContext *tc);
189
190/// Target getpagesize() handler.
191SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
192                              LiveProcess *p, ThreadContext *tc);
193
194/// Target obreak() handler: set brk address.
195SyscallReturn obreakFunc(SyscallDesc *desc, int num,
196                         LiveProcess *p, ThreadContext *tc);
197
198/// Target close() handler.
199SyscallReturn closeFunc(SyscallDesc *desc, int num,
200                        LiveProcess *p, ThreadContext *tc);
201
202/// Target read() handler.
203SyscallReturn readFunc(SyscallDesc *desc, int num,
204                       LiveProcess *p, ThreadContext *tc);
205
206/// Target write() handler.
207SyscallReturn writeFunc(SyscallDesc *desc, int num,
208                        LiveProcess *p, ThreadContext *tc);
209
210/// Target lseek() handler.
211SyscallReturn lseekFunc(SyscallDesc *desc, int num,
212                        LiveProcess *p, ThreadContext *tc);
213
214/// Target munmap() handler.
215SyscallReturn munmapFunc(SyscallDesc *desc, int num,
216                         LiveProcess *p, ThreadContext *tc);
217
218/// Target gethostname() handler.
219SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
220                              LiveProcess *p, ThreadContext *tc);
221
222/// Target unlink() handler.
223SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
224                         LiveProcess *p, ThreadContext *tc);
225
226/// Target rename() handler.
227SyscallReturn renameFunc(SyscallDesc *desc, int num,
228                         LiveProcess *p, ThreadContext *tc);
229
230
231/// Target truncate() handler.
232SyscallReturn truncateFunc(SyscallDesc *desc, int num,
233                           LiveProcess *p, ThreadContext *tc);
234
235
236/// Target ftruncate() handler.
237SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
238                            LiveProcess *p, ThreadContext *tc);
239
240
241/// Target chown() handler.
242SyscallReturn chownFunc(SyscallDesc *desc, int num,
243                        LiveProcess *p, ThreadContext *tc);
244
245
246/// Target fchown() handler.
247SyscallReturn fchownFunc(SyscallDesc *desc, int num,
248                         LiveProcess *p, ThreadContext *tc);
249
250/// Target dup() handler.
251SyscallReturn dupFunc(SyscallDesc *desc, int num,
252                      LiveProcess *process, ThreadContext *tc);
253
254/// Target fnctl() handler.
255SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
256                        LiveProcess *process, ThreadContext *tc);
257
258/// Target fcntl64() handler.
259SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
260                        LiveProcess *process, ThreadContext *tc);
261
262/// Target setuid() handler.
263SyscallReturn setuidFunc(SyscallDesc *desc, int num,
264                               LiveProcess *p, ThreadContext *tc);
265
266/// Target getpid() handler.
267SyscallReturn getpidFunc(SyscallDesc *desc, int num,
268                               LiveProcess *p, ThreadContext *tc);
269
270/// Target getuid() handler.
271SyscallReturn getuidFunc(SyscallDesc *desc, int num,
272                               LiveProcess *p, ThreadContext *tc);
273
274/// Target getgid() handler.
275SyscallReturn getgidFunc(SyscallDesc *desc, int num,
276                               LiveProcess *p, ThreadContext *tc);
277
278/// Target getppid() handler.
279SyscallReturn getppidFunc(SyscallDesc *desc, int num,
280                               LiveProcess *p, ThreadContext *tc);
281
282/// Target geteuid() handler.
283SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
284                               LiveProcess *p, ThreadContext *tc);
285
286/// Target getegid() handler.
287SyscallReturn getegidFunc(SyscallDesc *desc, int num,
288                               LiveProcess *p, ThreadContext *tc);
289
290
291
292/// Pseudo Funcs  - These functions use a different return convension,
293/// returning a second value in a register other than the normal return register
294SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
295                             LiveProcess *process, ThreadContext *tc);
296
297/// Target getpidPseudo() handler.
298SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
299                               LiveProcess *p, ThreadContext *tc);
300
301/// Target getuidPseudo() handler.
302SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
303                               LiveProcess *p, ThreadContext *tc);
304
305/// Target getgidPseudo() handler.
306SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
307                               LiveProcess *p, ThreadContext *tc);
308
309
310/// A readable name for 1,000,000, for converting microseconds to seconds.
311const int one_million = 1000000;
312
313/// Approximate seconds since the epoch (1/1/1970).  About a billion,
314/// by my reckoning.  We want to keep this a constant (not use the
315/// real-world time) to keep simulations repeatable.
316const unsigned seconds_since_epoch = 1000000000;
317
318/// Helper function to convert current elapsed time to seconds and
319/// microseconds.
320template <class T1, class T2>
321void
322getElapsedTime(T1 &sec, T2 &usec)
323{
324    int elapsed_usecs = curTick / Clock::Int::us;
325    sec = elapsed_usecs / one_million;
326    usec = elapsed_usecs % one_million;
327}
328
329//////////////////////////////////////////////////////////////////////
330//
331// The following emulation functions are generic, but need to be
332// templated to account for differences in types, constants, etc.
333//
334//////////////////////////////////////////////////////////////////////
335
336#if NO_STAT64
337    typedef struct stat hst_stat;
338    typedef struct stat hst_stat64;
339#else
340    typedef struct stat hst_stat;
341    typedef struct stat64 hst_stat64;
342#endif
343
344//// Helper function to convert a host stat buffer to a target stat
345//// buffer.  Also copies the target buffer out to the simulated
346//// memory space.  Used by stat(), fstat(), and lstat().
347
348template <typename target_stat, typename host_stat>
349static void
350convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
351{
352    if (fakeTTY)
353        tgt->st_dev = 0xA;
354    else
355        tgt->st_dev = host->st_dev;
356    tgt->st_dev = htog(tgt->st_dev);
357    tgt->st_ino = host->st_ino;
358    tgt->st_ino = htog(tgt->st_ino);
359    if (fakeTTY)
360        tgt->st_rdev = 0x880d;
361    else
362        tgt->st_rdev = host->st_rdev;
363    tgt->st_rdev = htog(tgt->st_rdev);
364    tgt->st_size = host->st_size;
365    tgt->st_size = htog(tgt->st_size);
366    tgt->st_atimeX = host->st_atime;
367    tgt->st_atimeX = htog(tgt->st_atimeX);
368    tgt->st_mtimeX = host->st_mtime;
369    tgt->st_mtimeX = htog(tgt->st_mtimeX);
370    tgt->st_ctimeX = host->st_ctime;
371    tgt->st_ctimeX = htog(tgt->st_ctimeX);
372    tgt->st_blksize = host->st_blksize;
373    tgt->st_blksize = htog(tgt->st_blksize);
374    tgt->st_blocks = host->st_blocks;
375    tgt->st_blocks = htog(tgt->st_blocks);
376}
377
378// Same for stat64
379
380template <typename target_stat, typename host_stat64>
381static void
382convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
383{
384    convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
385#if defined(STAT_HAVE_NSEC)
386    tgt->st_atime_nsec = host->st_atime_nsec;
387    tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
388    tgt->st_mtime_nsec = host->st_mtime_nsec;
389    tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
390    tgt->st_ctime_nsec = host->st_ctime_nsec;
391    tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
392#else
393    tgt->st_atime_nsec = 0;
394    tgt->st_mtime_nsec = 0;
395    tgt->st_ctime_nsec = 0;
396#endif
397}
398
399//Here are a couple convenience functions
400template<class OS>
401static void
402copyOutStatBuf(TranslatingPort * mem, Addr addr,
403        hst_stat *host, bool fakeTTY = false)
404{
405    typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
406    tgt_stat_buf tgt(addr);
407    convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
408    tgt.copyOut(mem);
409}
410
411template<class OS>
412static void
413copyOutStat64Buf(TranslatingPort * mem, Addr addr,
414        hst_stat64 *host, bool fakeTTY = false)
415{
416    typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
417    tgt_stat_buf tgt(addr);
418    convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
419    tgt.copyOut(mem);
420}
421
422/// Target ioctl() handler.  For the most part, programs call ioctl()
423/// only to find out if their stdout is a tty, to determine whether to
424/// do line or block buffering.
425template <class OS>
426SyscallReturn
427ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
428          ThreadContext *tc)
429{
430    int fd = tc->getSyscallArg(0);
431    unsigned req = tc->getSyscallArg(1);
432
433    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
434
435    if (fd < 0 || process->sim_fd(fd) < 0) {
436        // doesn't map to any simulator fd: not a valid target fd
437        return -EBADF;
438    }
439
440    switch (req) {
441      case OS::TIOCISATTY:
442      case OS::TIOCGETP:
443      case OS::TIOCSETP:
444      case OS::TIOCSETN:
445      case OS::TIOCSETC:
446      case OS::TIOCGETC:
447      case OS::TIOCGETS:
448      case OS::TIOCGETA:
449        return -ENOTTY;
450
451      default:
452        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
453              fd, req, tc->readPC());
454    }
455}
456
457/// Target open() handler.
458template <class OS>
459SyscallReturn
460openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
461         ThreadContext *tc)
462{
463    std::string path;
464
465    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
466        return -EFAULT;
467
468    if (path == "/dev/sysdev0") {
469        // This is a memory-mapped high-resolution timer device on Alpha.
470        // We don't support it, so just punt.
471        warn("Ignoring open(%s, ...)\n", path);
472        return -ENOENT;
473    }
474
475    int tgtFlags = tc->getSyscallArg(1);
476    int mode = tc->getSyscallArg(2);
477    int hostFlags = 0;
478
479    // translate open flags
480    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
481        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
482            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
483            hostFlags |= OS::openFlagTable[i].hostFlag;
484        }
485    }
486
487    // any target flags left?
488    if (tgtFlags != 0)
489        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
490
491#ifdef __CYGWIN32__
492    hostFlags |= O_BINARY;
493#endif
494
495    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
496
497    // open the file
498    int fd = open(path.c_str(), hostFlags, mode);
499
500    return (fd == -1) ? -errno : process->alloc_fd(fd);
501}
502
503
504/// Target chmod() handler.
505template <class OS>
506SyscallReturn
507chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
508          ThreadContext *tc)
509{
510    std::string path;
511
512    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
513        return -EFAULT;
514
515    uint32_t mode = tc->getSyscallArg(1);
516    mode_t hostMode = 0;
517
518    // XXX translate mode flags via OS::something???
519    hostMode = mode;
520
521    // do the chmod
522    int result = chmod(path.c_str(), hostMode);
523    if (result < 0)
524        return -errno;
525
526    return 0;
527}
528
529
530/// Target fchmod() handler.
531template <class OS>
532SyscallReturn
533fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
534           ThreadContext *tc)
535{
536    int fd = tc->getSyscallArg(0);
537    if (fd < 0 || process->sim_fd(fd) < 0) {
538        // doesn't map to any simulator fd: not a valid target fd
539        return -EBADF;
540    }
541
542    uint32_t mode = tc->getSyscallArg(1);
543    mode_t hostMode = 0;
544
545    // XXX translate mode flags via OS::someting???
546    hostMode = mode;
547
548    // do the fchmod
549    int result = fchmod(process->sim_fd(fd), hostMode);
550    if (result < 0)
551        return -errno;
552
553    return 0;
554}
555
556
557/// Target stat() handler.
558template <class OS>
559SyscallReturn
560statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
561         ThreadContext *tc)
562{
563    std::string path;
564
565    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
566    return -EFAULT;
567
568    struct stat hostBuf;
569    int result = stat(path.c_str(), &hostBuf);
570
571    if (result < 0)
572        return -errno;
573
574    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
575
576    return 0;
577}
578
579
580/// Target fstat64() handler.
581template <class OS>
582SyscallReturn
583fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
584            ThreadContext *tc)
585{
586    int fd = tc->getSyscallArg(0);
587    if (fd < 0 || process->sim_fd(fd) < 0) {
588        // doesn't map to any simulator fd: not a valid target fd
589        return -EBADF;
590    }
591
592#if NO_STAT64
593    struct stat  hostBuf;
594    int result = fstat(process->sim_fd(fd), &hostBuf);
595#else
596    struct stat64  hostBuf;
597    int result = fstat64(process->sim_fd(fd), &hostBuf);
598#endif
599
600    if (result < 0)
601        return -errno;
602
603    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
604        &hostBuf, (fd == 1));
605
606    return 0;
607}
608
609
610/// Target lstat() handler.
611template <class OS>
612SyscallReturn
613lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
614          ThreadContext *tc)
615{
616    std::string path;
617
618    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
619      return -EFAULT;
620
621    struct stat hostBuf;
622    int result = lstat(path.c_str(), &hostBuf);
623
624    if (result < 0)
625        return -errno;
626
627    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
628
629    return 0;
630}
631
632/// Target lstat64() handler.
633template <class OS>
634SyscallReturn
635lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
636            ThreadContext *tc)
637{
638    std::string path;
639
640    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
641      return -EFAULT;
642
643#if NO_STAT64
644    struct stat hostBuf;
645    int result = lstat(path.c_str(), &hostBuf);
646#else
647    struct stat64 hostBuf;
648    int result = lstat64(path.c_str(), &hostBuf);
649#endif
650
651    if (result < 0)
652        return -errno;
653
654    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
655
656    return 0;
657}
658
659/// Target fstat() handler.
660template <class OS>
661SyscallReturn
662fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
663          ThreadContext *tc)
664{
665    int fd = process->sim_fd(tc->getSyscallArg(0));
666
667    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
668
669    if (fd < 0)
670        return -EBADF;
671
672    struct stat hostBuf;
673    int result = fstat(fd, &hostBuf);
674
675    if (result < 0)
676        return -errno;
677
678    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
679        &hostBuf, (fd == 1));
680
681    return 0;
682}
683
684
685/// Target statfs() handler.
686template <class OS>
687SyscallReturn
688statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
689           ThreadContext *tc)
690{
691    std::string path;
692
693    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
694      return -EFAULT;
695
696    struct statfs hostBuf;
697    int result = statfs(path.c_str(), &hostBuf);
698
699    if (result < 0)
700        return -errno;
701
702    OS::copyOutStatfsBuf(tc->getMemPort(),
703            (Addr)(tc->getSyscallArg(1)), &hostBuf);
704
705    return 0;
706}
707
708
709/// Target fstatfs() handler.
710template <class OS>
711SyscallReturn
712fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
713            ThreadContext *tc)
714{
715    int fd = process->sim_fd(tc->getSyscallArg(0));
716
717    if (fd < 0)
718        return -EBADF;
719
720    struct statfs hostBuf;
721    int result = fstatfs(fd, &hostBuf);
722
723    if (result < 0)
724        return -errno;
725
726    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
727        &hostBuf);
728
729    return 0;
730}
731
732
733/// Target writev() handler.
734template <class OS>
735SyscallReturn
736writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
737           ThreadContext *tc)
738{
739    int fd = tc->getSyscallArg(0);
740    if (fd < 0 || process->sim_fd(fd) < 0) {
741        // doesn't map to any simulator fd: not a valid target fd
742        return -EBADF;
743    }
744
745    TranslatingPort *p = tc->getMemPort();
746    uint64_t tiov_base = tc->getSyscallArg(1);
747    size_t count = tc->getSyscallArg(2);
748    struct iovec hiov[count];
749    for (int i = 0; i < count; ++i)
750    {
751        typename OS::tgt_iovec tiov;
752
753        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
754                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
755        hiov[i].iov_len = gtoh(tiov.iov_len);
756        hiov[i].iov_base = new char [hiov[i].iov_len];
757        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
758                    hiov[i].iov_len);
759    }
760
761    int result = writev(process->sim_fd(fd), hiov, count);
762
763    for (int i = 0; i < count; ++i)
764    {
765        delete [] (char *)hiov[i].iov_base;
766    }
767
768    if (result < 0)
769        return -errno;
770
771    return 0;
772}
773
774
775/// Target mmap() handler.
776///
777/// We don't really handle mmap().  If the target is mmaping an
778/// anonymous region or /dev/zero, we can get away with doing basically
779/// nothing (since memory is initialized to zero and the simulator
780/// doesn't really check addresses anyway).  Always print a warning,
781/// since this could be seriously broken if we're not mapping
782/// /dev/zero.
783//
784/// Someday we should explicitly check for /dev/zero in open, flag the
785/// file descriptor, and fail (or implement!) a non-anonymous mmap to
786/// anything else.
787template <class OS>
788SyscallReturn
789mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
790{
791    Addr start = tc->getSyscallArg(0);
792    uint64_t length = tc->getSyscallArg(1);
793    // int prot = tc->getSyscallArg(2);
794    int flags = tc->getSyscallArg(3);
795    // int fd = p->sim_fd(tc->getSyscallArg(4));
796    // int offset = tc->getSyscallArg(5);
797
798    if ((start  % TheISA::VMPageSize) != 0 ||
799        (length % TheISA::VMPageSize) != 0) {
800        warn("mmap failing: arguments not page-aligned: "
801             "start 0x%x length 0x%x",
802             start, length);
803        return -EINVAL;
804    }
805
806    if (start != 0) {
807        warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
808             start, p->mmap_end);
809    }
810
811    // pick next address from our "mmap region"
812    start = p->mmap_end;
813    p->pTable->allocate(start, length);
814    p->mmap_end += length;
815
816    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
817        warn("allowing mmap of file @ fd %d. "
818             "This will break if not /dev/zero.", tc->getSyscallArg(4));
819    }
820
821    return start;
822}
823
824/// Target getrlimit() handler.
825template <class OS>
826SyscallReturn
827getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
828        ThreadContext *tc)
829{
830    unsigned resource = tc->getSyscallArg(0);
831    TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
832
833    switch (resource) {
834        case OS::TGT_RLIMIT_STACK:
835            // max stack size in bytes: make up a number (2MB for now)
836            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
837            rlp->rlim_cur = htog(rlp->rlim_cur);
838            rlp->rlim_max = htog(rlp->rlim_max);
839            break;
840
841        default:
842            std::cerr << "getrlimitFunc: unimplemented resource " << resource
843                << std::endl;
844            abort();
845            break;
846    }
847
848    rlp.copyOut(tc->getMemPort());
849    return 0;
850}
851
852/// Target gettimeofday() handler.
853template <class OS>
854SyscallReturn
855gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
856        ThreadContext *tc)
857{
858    TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
859
860    getElapsedTime(tp->tv_sec, tp->tv_usec);
861    tp->tv_sec += seconds_since_epoch;
862    tp->tv_sec = htog(tp->tv_sec);
863    tp->tv_usec = htog(tp->tv_usec);
864
865    tp.copyOut(tc->getMemPort());
866
867    return 0;
868}
869
870
871/// Target utimes() handler.
872template <class OS>
873SyscallReturn
874utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
875           ThreadContext *tc)
876{
877    std::string path;
878
879    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
880      return -EFAULT;
881
882    TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
883    tp.copyIn(tc->getMemPort());
884
885    struct timeval hostTimeval[2];
886    for (int i = 0; i < 2; ++i)
887    {
888        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
889        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
890    }
891    int result = utimes(path.c_str(), hostTimeval);
892
893    if (result < 0)
894        return -errno;
895
896    return 0;
897}
898/// Target getrusage() function.
899template <class OS>
900SyscallReturn
901getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
902              ThreadContext *tc)
903{
904    int who = tc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
905    TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
906
907    if (who != OS::TGT_RUSAGE_SELF) {
908        // don't really handle THREAD or CHILDREN, but just warn and
909        // plow ahead
910        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
911             who);
912    }
913
914    getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
915    rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
916    rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
917
918    rup->ru_stime.tv_sec = 0;
919    rup->ru_stime.tv_usec = 0;
920    rup->ru_maxrss = 0;
921    rup->ru_ixrss = 0;
922    rup->ru_idrss = 0;
923    rup->ru_isrss = 0;
924    rup->ru_minflt = 0;
925    rup->ru_majflt = 0;
926    rup->ru_nswap = 0;
927    rup->ru_inblock = 0;
928    rup->ru_oublock = 0;
929    rup->ru_msgsnd = 0;
930    rup->ru_msgrcv = 0;
931    rup->ru_nsignals = 0;
932    rup->ru_nvcsw = 0;
933    rup->ru_nivcsw = 0;
934
935    rup.copyOut(tc->getMemPort());
936
937    return 0;
938}
939
940
941
942
943#endif // __SIM_SYSCALL_EMUL_HH__
944