syscall_emul.hh revision 4061:45162dc462a7 
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    tgt->st_mode = host->st_mode;
360    tgt->st_mode = htog(tgt->st_mode);
361    tgt->st_nlink = host->st_nlink;
362    tgt->st_nlink = htog(tgt->st_nlink);
363    tgt->st_uid = host->st_uid;
364    tgt->st_uid = htog(tgt->st_uid);
365    tgt->st_gid = host->st_gid;
366    tgt->st_gid = htog(tgt->st_gid);
367    if (fakeTTY)
368        tgt->st_rdev = 0x880d;
369    else
370        tgt->st_rdev = host->st_rdev;
371    tgt->st_rdev = htog(tgt->st_rdev);
372    tgt->st_size = host->st_size;
373    tgt->st_size = htog(tgt->st_size);
374    tgt->st_atimeX = host->st_atime;
375    tgt->st_atimeX = htog(tgt->st_atimeX);
376    tgt->st_mtimeX = host->st_mtime;
377    tgt->st_mtimeX = htog(tgt->st_mtimeX);
378    tgt->st_ctimeX = host->st_ctime;
379    tgt->st_ctimeX = htog(tgt->st_ctimeX);
380    // Force the block size to be 8k. This helps to ensure buffered io works
381    // consistently across different hosts.
382    tgt->st_blksize = 0x2000;
383    tgt->st_blksize = htog(tgt->st_blksize);
384    tgt->st_blocks = host->st_blocks;
385    tgt->st_blocks = htog(tgt->st_blocks);
386}
387
388// Same for stat64
389
390template <typename target_stat, typename host_stat64>
391static void
392convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
393{
394    convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
395#if defined(STAT_HAVE_NSEC)
396    tgt->st_atime_nsec = host->st_atime_nsec;
397    tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
398    tgt->st_mtime_nsec = host->st_mtime_nsec;
399    tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
400    tgt->st_ctime_nsec = host->st_ctime_nsec;
401    tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
402#else
403    tgt->st_atime_nsec = 0;
404    tgt->st_mtime_nsec = 0;
405    tgt->st_ctime_nsec = 0;
406#endif
407}
408
409//Here are a couple convenience functions
410template<class OS>
411static void
412copyOutStatBuf(TranslatingPort * mem, Addr addr,
413        hst_stat *host, bool fakeTTY = false)
414{
415    typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
416    tgt_stat_buf tgt(addr);
417    convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
418    tgt.copyOut(mem);
419}
420
421template<class OS>
422static void
423copyOutStat64Buf(TranslatingPort * mem, Addr addr,
424        hst_stat64 *host, bool fakeTTY = false)
425{
426    typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
427    tgt_stat_buf tgt(addr);
428    convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
429    tgt.copyOut(mem);
430}
431
432/// Target ioctl() handler.  For the most part, programs call ioctl()
433/// only to find out if their stdout is a tty, to determine whether to
434/// do line or block buffering.
435template <class OS>
436SyscallReturn
437ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
438          ThreadContext *tc)
439{
440    int fd = tc->getSyscallArg(0);
441    unsigned req = tc->getSyscallArg(1);
442
443    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
444
445    if (fd < 0 || process->sim_fd(fd) < 0) {
446        // doesn't map to any simulator fd: not a valid target fd
447        return -EBADF;
448    }
449
450    switch (req) {
451      case OS::TIOCISATTY:
452      case OS::TIOCGETP:
453      case OS::TIOCSETP:
454      case OS::TIOCSETN:
455      case OS::TIOCSETC:
456      case OS::TIOCGETC:
457      case OS::TIOCGETS:
458      case OS::TIOCGETA:
459        return -ENOTTY;
460
461      default:
462        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
463              fd, req, tc->readPC());
464    }
465}
466
467/// Target open() handler.
468template <class OS>
469SyscallReturn
470openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
471         ThreadContext *tc)
472{
473    std::string path;
474
475    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
476        return -EFAULT;
477
478    if (path == "/dev/sysdev0") {
479        // This is a memory-mapped high-resolution timer device on Alpha.
480        // We don't support it, so just punt.
481        warn("Ignoring open(%s, ...)\n", path);
482        return -ENOENT;
483    }
484
485    int tgtFlags = tc->getSyscallArg(1);
486    int mode = tc->getSyscallArg(2);
487    int hostFlags = 0;
488
489    // translate open flags
490    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
491        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
492            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
493            hostFlags |= OS::openFlagTable[i].hostFlag;
494        }
495    }
496
497    // any target flags left?
498    if (tgtFlags != 0)
499        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
500
501#ifdef __CYGWIN32__
502    hostFlags |= O_BINARY;
503#endif
504
505    // Adjust path for current working directory
506    path = process->fullPath(path);
507
508    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
509
510    // open the file
511    int fd = open(path.c_str(), hostFlags, mode);
512
513    return (fd == -1) ? -errno : process->alloc_fd(fd);
514}
515
516
517/// Target chmod() handler.
518template <class OS>
519SyscallReturn
520chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
521          ThreadContext *tc)
522{
523    std::string path;
524
525    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
526        return -EFAULT;
527
528    uint32_t mode = tc->getSyscallArg(1);
529    mode_t hostMode = 0;
530
531    // XXX translate mode flags via OS::something???
532    hostMode = mode;
533
534    // Adjust path for current working directory
535    path = process->fullPath(path);
536
537    // do the chmod
538    int result = chmod(path.c_str(), hostMode);
539    if (result < 0)
540        return -errno;
541
542    return 0;
543}
544
545
546/// Target fchmod() handler.
547template <class OS>
548SyscallReturn
549fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
550           ThreadContext *tc)
551{
552    int fd = tc->getSyscallArg(0);
553    if (fd < 0 || process->sim_fd(fd) < 0) {
554        // doesn't map to any simulator fd: not a valid target fd
555        return -EBADF;
556    }
557
558    uint32_t mode = tc->getSyscallArg(1);
559    mode_t hostMode = 0;
560
561    // XXX translate mode flags via OS::someting???
562    hostMode = mode;
563
564    // do the fchmod
565    int result = fchmod(process->sim_fd(fd), hostMode);
566    if (result < 0)
567        return -errno;
568
569    return 0;
570}
571
572
573/// Target stat() handler.
574template <class OS>
575SyscallReturn
576statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
577         ThreadContext *tc)
578{
579    std::string path;
580
581    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
582    return -EFAULT;
583
584    // Adjust path for current working directory
585    path = process->fullPath(path);
586
587    struct stat hostBuf;
588    int result = stat(path.c_str(), &hostBuf);
589
590    if (result < 0)
591        return -errno;
592
593    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
594
595    return 0;
596}
597
598
599/// Target fstat64() handler.
600template <class OS>
601SyscallReturn
602fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
603            ThreadContext *tc)
604{
605    int fd = tc->getSyscallArg(0);
606    if (fd < 0 || process->sim_fd(fd) < 0) {
607        // doesn't map to any simulator fd: not a valid target fd
608        return -EBADF;
609    }
610
611#if NO_STAT64
612    struct stat  hostBuf;
613    int result = fstat(process->sim_fd(fd), &hostBuf);
614#else
615    struct stat64  hostBuf;
616    int result = fstat64(process->sim_fd(fd), &hostBuf);
617#endif
618
619    if (result < 0)
620        return -errno;
621
622    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
623        &hostBuf, (fd == 1));
624
625    return 0;
626}
627
628
629/// Target lstat() handler.
630template <class OS>
631SyscallReturn
632lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
633          ThreadContext *tc)
634{
635    std::string path;
636
637    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
638      return -EFAULT;
639
640    // Adjust path for current working directory
641    path = process->fullPath(path);
642
643    struct stat hostBuf;
644    int result = lstat(path.c_str(), &hostBuf);
645
646    if (result < 0)
647        return -errno;
648
649    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
650
651    return 0;
652}
653
654/// Target lstat64() handler.
655template <class OS>
656SyscallReturn
657lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
658            ThreadContext *tc)
659{
660    std::string path;
661
662    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
663      return -EFAULT;
664
665    // Adjust path for current working directory
666    path = process->fullPath(path);
667
668#if NO_STAT64
669    struct stat hostBuf;
670    int result = lstat(path.c_str(), &hostBuf);
671#else
672    struct stat64 hostBuf;
673    int result = lstat64(path.c_str(), &hostBuf);
674#endif
675
676    if (result < 0)
677        return -errno;
678
679    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
680
681    return 0;
682}
683
684/// Target fstat() handler.
685template <class OS>
686SyscallReturn
687fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
688          ThreadContext *tc)
689{
690    int fd = process->sim_fd(tc->getSyscallArg(0));
691
692    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
693
694    if (fd < 0)
695        return -EBADF;
696
697    struct stat hostBuf;
698    int result = fstat(fd, &hostBuf);
699
700    if (result < 0)
701        return -errno;
702
703    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
704        &hostBuf, (fd == 1));
705
706    return 0;
707}
708
709
710/// Target statfs() handler.
711template <class OS>
712SyscallReturn
713statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
714           ThreadContext *tc)
715{
716    std::string path;
717
718    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
719      return -EFAULT;
720
721    // Adjust path for current working directory
722    path = process->fullPath(path);
723
724    struct statfs hostBuf;
725    int result = statfs(path.c_str(), &hostBuf);
726
727    if (result < 0)
728        return -errno;
729
730    OS::copyOutStatfsBuf(tc->getMemPort(),
731            (Addr)(tc->getSyscallArg(1)), &hostBuf);
732
733    return 0;
734}
735
736
737/// Target fstatfs() handler.
738template <class OS>
739SyscallReturn
740fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
741            ThreadContext *tc)
742{
743    int fd = process->sim_fd(tc->getSyscallArg(0));
744
745    if (fd < 0)
746        return -EBADF;
747
748    struct statfs hostBuf;
749    int result = fstatfs(fd, &hostBuf);
750
751    if (result < 0)
752        return -errno;
753
754    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
755        &hostBuf);
756
757    return 0;
758}
759
760
761/// Target writev() handler.
762template <class OS>
763SyscallReturn
764writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
765           ThreadContext *tc)
766{
767    int fd = tc->getSyscallArg(0);
768    if (fd < 0 || process->sim_fd(fd) < 0) {
769        // doesn't map to any simulator fd: not a valid target fd
770        return -EBADF;
771    }
772
773    TranslatingPort *p = tc->getMemPort();
774    uint64_t tiov_base = tc->getSyscallArg(1);
775    size_t count = tc->getSyscallArg(2);
776    struct iovec hiov[count];
777    for (int i = 0; i < count; ++i)
778    {
779        typename OS::tgt_iovec tiov;
780
781        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
782                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
783        hiov[i].iov_len = gtoh(tiov.iov_len);
784        hiov[i].iov_base = new char [hiov[i].iov_len];
785        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
786                    hiov[i].iov_len);
787    }
788
789    int result = writev(process->sim_fd(fd), hiov, count);
790
791    for (int i = 0; i < count; ++i)
792    {
793        delete [] (char *)hiov[i].iov_base;
794    }
795
796    if (result < 0)
797        return -errno;
798
799    return 0;
800}
801
802
803/// Target mmap() handler.
804///
805/// We don't really handle mmap().  If the target is mmaping an
806/// anonymous region or /dev/zero, we can get away with doing basically
807/// nothing (since memory is initialized to zero and the simulator
808/// doesn't really check addresses anyway).  Always print a warning,
809/// since this could be seriously broken if we're not mapping
810/// /dev/zero.
811//
812/// Someday we should explicitly check for /dev/zero in open, flag the
813/// file descriptor, and fail (or implement!) a non-anonymous mmap to
814/// anything else.
815template <class OS>
816SyscallReturn
817mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
818{
819    Addr start = tc->getSyscallArg(0);
820    uint64_t length = tc->getSyscallArg(1);
821    // int prot = tc->getSyscallArg(2);
822    int flags = tc->getSyscallArg(3);
823    // int fd = p->sim_fd(tc->getSyscallArg(4));
824    // int offset = tc->getSyscallArg(5);
825
826    if ((start  % TheISA::VMPageSize) != 0 ||
827        (length % TheISA::VMPageSize) != 0) {
828        warn("mmap failing: arguments not page-aligned: "
829             "start 0x%x length 0x%x",
830             start, length);
831        return -EINVAL;
832    }
833
834    if (start != 0) {
835        warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
836             start, p->mmap_end);
837    }
838
839    // pick next address from our "mmap region"
840    start = p->mmap_end;
841    p->pTable->allocate(start, length);
842    p->mmap_end += length;
843
844    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
845        warn("allowing mmap of file @ fd %d. "
846             "This will break if not /dev/zero.", tc->getSyscallArg(4));
847    }
848
849    return start;
850}
851
852/// Target getrlimit() handler.
853template <class OS>
854SyscallReturn
855getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
856        ThreadContext *tc)
857{
858    unsigned resource = tc->getSyscallArg(0);
859    TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
860
861    switch (resource) {
862        case OS::TGT_RLIMIT_STACK:
863            // max stack size in bytes: make up a number (2MB for now)
864            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
865            rlp->rlim_cur = htog(rlp->rlim_cur);
866            rlp->rlim_max = htog(rlp->rlim_max);
867            break;
868
869        default:
870            std::cerr << "getrlimitFunc: unimplemented resource " << resource
871                << std::endl;
872            abort();
873            break;
874    }
875
876    rlp.copyOut(tc->getMemPort());
877    return 0;
878}
879
880/// Target gettimeofday() handler.
881template <class OS>
882SyscallReturn
883gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
884        ThreadContext *tc)
885{
886    TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
887
888    getElapsedTime(tp->tv_sec, tp->tv_usec);
889    tp->tv_sec += seconds_since_epoch;
890    tp->tv_sec = htog(tp->tv_sec);
891    tp->tv_usec = htog(tp->tv_usec);
892
893    tp.copyOut(tc->getMemPort());
894
895    return 0;
896}
897
898
899/// Target utimes() handler.
900template <class OS>
901SyscallReturn
902utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
903           ThreadContext *tc)
904{
905    std::string path;
906
907    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
908      return -EFAULT;
909
910    TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
911    tp.copyIn(tc->getMemPort());
912
913    struct timeval hostTimeval[2];
914    for (int i = 0; i < 2; ++i)
915    {
916        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
917        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
918    }
919
920    // Adjust path for current working directory
921    path = process->fullPath(path);
922
923    int result = utimes(path.c_str(), hostTimeval);
924
925    if (result < 0)
926        return -errno;
927
928    return 0;
929}
930/// Target getrusage() function.
931template <class OS>
932SyscallReturn
933getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
934              ThreadContext *tc)
935{
936    int who = tc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
937    TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
938
939    rup->ru_utime.tv_sec = 0;
940    rup->ru_utime.tv_usec = 0;
941    rup->ru_stime.tv_sec = 0;
942    rup->ru_stime.tv_usec = 0;
943    rup->ru_maxrss = 0;
944    rup->ru_ixrss = 0;
945    rup->ru_idrss = 0;
946    rup->ru_isrss = 0;
947    rup->ru_minflt = 0;
948    rup->ru_majflt = 0;
949    rup->ru_nswap = 0;
950    rup->ru_inblock = 0;
951    rup->ru_oublock = 0;
952    rup->ru_msgsnd = 0;
953    rup->ru_msgrcv = 0;
954    rup->ru_nsignals = 0;
955    rup->ru_nvcsw = 0;
956    rup->ru_nivcsw = 0;
957
958    switch (who) {
959      case OS::TGT_RUSAGE_SELF:
960        getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
961        rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
962        rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
963        break;
964
965      case OS::TGT_RUSAGE_CHILDREN:
966        // do nothing.  We have no child processes, so they take no time.
967        break;
968
969      default:
970        // don't really handle THREAD or CHILDREN, but just warn and
971        // plow ahead
972        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
973             who);
974    }
975
976    rup.copyOut(tc->getMemPort());
977
978    return 0;
979}
980
981
982
983
984#endif // __SIM_SYSCALL_EMUL_HH__
985