syscall_emul.hh revision 5513 
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 _llseek() handler.
215SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
216                        LiveProcess *p, ThreadContext *tc);
217
218/// Target munmap() handler.
219SyscallReturn munmapFunc(SyscallDesc *desc, int num,
220                         LiveProcess *p, ThreadContext *tc);
221
222/// Target gethostname() handler.
223SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
224                              LiveProcess *p, ThreadContext *tc);
225
226/// Target getcwd() handler.
227SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
228                         LiveProcess *p, ThreadContext *tc);
229
230/// Target unlink() handler.
231SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
232                           LiveProcess *p, ThreadContext *tc);
233
234/// Target unlink() handler.
235SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
236                         LiveProcess *p, ThreadContext *tc);
237
238/// Target mkdir() handler.
239SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
240                        LiveProcess *p, ThreadContext *tc);
241
242/// Target rename() handler.
243SyscallReturn renameFunc(SyscallDesc *desc, int num,
244                         LiveProcess *p, ThreadContext *tc);
245
246
247/// Target truncate() handler.
248SyscallReturn truncateFunc(SyscallDesc *desc, int num,
249                           LiveProcess *p, ThreadContext *tc);
250
251
252/// Target ftruncate() handler.
253SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
254                            LiveProcess *p, ThreadContext *tc);
255
256
257/// Target umask() handler.
258SyscallReturn umaskFunc(SyscallDesc *desc, int num,
259                        LiveProcess *p, ThreadContext *tc);
260
261
262/// Target chown() handler.
263SyscallReturn chownFunc(SyscallDesc *desc, int num,
264                        LiveProcess *p, ThreadContext *tc);
265
266
267/// Target fchown() handler.
268SyscallReturn fchownFunc(SyscallDesc *desc, int num,
269                         LiveProcess *p, ThreadContext *tc);
270
271/// Target dup() handler.
272SyscallReturn dupFunc(SyscallDesc *desc, int num,
273                      LiveProcess *process, ThreadContext *tc);
274
275/// Target fnctl() handler.
276SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
277                        LiveProcess *process, ThreadContext *tc);
278
279/// Target fcntl64() handler.
280SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
281                        LiveProcess *process, ThreadContext *tc);
282
283/// Target setuid() handler.
284SyscallReturn setuidFunc(SyscallDesc *desc, int num,
285                               LiveProcess *p, ThreadContext *tc);
286
287/// Target getpid() handler.
288SyscallReturn getpidFunc(SyscallDesc *desc, int num,
289                               LiveProcess *p, ThreadContext *tc);
290
291/// Target getuid() handler.
292SyscallReturn getuidFunc(SyscallDesc *desc, int num,
293                               LiveProcess *p, ThreadContext *tc);
294
295/// Target getgid() handler.
296SyscallReturn getgidFunc(SyscallDesc *desc, int num,
297                               LiveProcess *p, ThreadContext *tc);
298
299/// Target getppid() handler.
300SyscallReturn getppidFunc(SyscallDesc *desc, int num,
301                               LiveProcess *p, ThreadContext *tc);
302
303/// Target geteuid() handler.
304SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
305                               LiveProcess *p, ThreadContext *tc);
306
307/// Target getegid() handler.
308SyscallReturn getegidFunc(SyscallDesc *desc, int num,
309                               LiveProcess *p, ThreadContext *tc);
310
311
312
313/// Pseudo Funcs  - These functions use a different return convension,
314/// returning a second value in a register other than the normal return register
315SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
316                             LiveProcess *process, ThreadContext *tc);
317
318/// Target getpidPseudo() handler.
319SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
320                               LiveProcess *p, ThreadContext *tc);
321
322/// Target getuidPseudo() handler.
323SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
324                               LiveProcess *p, ThreadContext *tc);
325
326/// Target getgidPseudo() handler.
327SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
328                               LiveProcess *p, ThreadContext *tc);
329
330
331/// A readable name for 1,000,000, for converting microseconds to seconds.
332const int one_million = 1000000;
333
334/// Approximate seconds since the epoch (1/1/1970).  About a billion,
335/// by my reckoning.  We want to keep this a constant (not use the
336/// real-world time) to keep simulations repeatable.
337const unsigned seconds_since_epoch = 1000000000;
338
339/// Helper function to convert current elapsed time to seconds and
340/// microseconds.
341template <class T1, class T2>
342void
343getElapsedTime(T1 &sec, T2 &usec)
344{
345    int elapsed_usecs = curTick / Clock::Int::us;
346    sec = elapsed_usecs / one_million;
347    usec = elapsed_usecs % one_million;
348}
349
350//////////////////////////////////////////////////////////////////////
351//
352// The following emulation functions are generic, but need to be
353// templated to account for differences in types, constants, etc.
354//
355//////////////////////////////////////////////////////////////////////
356
357#if NO_STAT64
358    typedef struct stat hst_stat;
359    typedef struct stat hst_stat64;
360#else
361    typedef struct stat hst_stat;
362    typedef struct stat64 hst_stat64;
363#endif
364
365//// Helper function to convert a host stat buffer to a target stat
366//// buffer.  Also copies the target buffer out to the simulated
367//// memory space.  Used by stat(), fstat(), and lstat().
368
369template <typename target_stat, typename host_stat>
370static void
371convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
372{
373    using namespace TheISA;
374
375    if (fakeTTY)
376        tgt->st_dev = 0xA;
377    else
378        tgt->st_dev = host->st_dev;
379    tgt->st_dev = htog(tgt->st_dev);
380    tgt->st_ino = host->st_ino;
381    tgt->st_ino = htog(tgt->st_ino);
382    tgt->st_mode = host->st_mode;
383    tgt->st_mode = htog(tgt->st_mode);
384    tgt->st_nlink = host->st_nlink;
385    tgt->st_nlink = htog(tgt->st_nlink);
386    tgt->st_uid = host->st_uid;
387    tgt->st_uid = htog(tgt->st_uid);
388    tgt->st_gid = host->st_gid;
389    tgt->st_gid = htog(tgt->st_gid);
390    if (fakeTTY)
391        tgt->st_rdev = 0x880d;
392    else
393        tgt->st_rdev = host->st_rdev;
394    tgt->st_rdev = htog(tgt->st_rdev);
395    tgt->st_size = host->st_size;
396    tgt->st_size = htog(tgt->st_size);
397    tgt->st_atimeX = host->st_atime;
398    tgt->st_atimeX = htog(tgt->st_atimeX);
399    tgt->st_mtimeX = host->st_mtime;
400    tgt->st_mtimeX = htog(tgt->st_mtimeX);
401    tgt->st_ctimeX = host->st_ctime;
402    tgt->st_ctimeX = htog(tgt->st_ctimeX);
403    // Force the block size to be 8k. This helps to ensure buffered io works
404    // consistently across different hosts.
405    tgt->st_blksize = 0x2000;
406    tgt->st_blksize = htog(tgt->st_blksize);
407    tgt->st_blocks = host->st_blocks;
408    tgt->st_blocks = htog(tgt->st_blocks);
409}
410
411// Same for stat64
412
413template <typename target_stat, typename host_stat64>
414static void
415convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
416{
417    using namespace TheISA;
418
419    convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
420#if defined(STAT_HAVE_NSEC)
421    tgt->st_atime_nsec = host->st_atime_nsec;
422    tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
423    tgt->st_mtime_nsec = host->st_mtime_nsec;
424    tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
425    tgt->st_ctime_nsec = host->st_ctime_nsec;
426    tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
427#else
428    tgt->st_atime_nsec = 0;
429    tgt->st_mtime_nsec = 0;
430    tgt->st_ctime_nsec = 0;
431#endif
432}
433
434//Here are a couple convenience functions
435template<class OS>
436static void
437copyOutStatBuf(TranslatingPort * mem, Addr addr,
438        hst_stat *host, bool fakeTTY = false)
439{
440    typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
441    tgt_stat_buf tgt(addr);
442    convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
443    tgt.copyOut(mem);
444}
445
446template<class OS>
447static void
448copyOutStat64Buf(TranslatingPort * mem, Addr addr,
449        hst_stat64 *host, bool fakeTTY = false)
450{
451    typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
452    tgt_stat_buf tgt(addr);
453    convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
454    tgt.copyOut(mem);
455}
456
457/// Target ioctl() handler.  For the most part, programs call ioctl()
458/// only to find out if their stdout is a tty, to determine whether to
459/// do line or block buffering.
460template <class OS>
461SyscallReturn
462ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
463          ThreadContext *tc)
464{
465    int fd = tc->getSyscallArg(0);
466    unsigned req = tc->getSyscallArg(1);
467
468    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
469
470    if (fd < 0 || process->sim_fd(fd) < 0) {
471        // doesn't map to any simulator fd: not a valid target fd
472        return -EBADF;
473    }
474
475    switch (req) {
476      case OS::TIOCISATTY_:
477      case OS::TIOCGETP_:
478      case OS::TIOCSETP_:
479      case OS::TIOCSETN_:
480      case OS::TIOCSETC_:
481      case OS::TIOCGETC_:
482      case OS::TIOCGETS_:
483      case OS::TIOCGETA_:
484        return -ENOTTY;
485
486      default:
487        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
488              fd, req, tc->readPC());
489    }
490}
491
492/// Target open() handler.
493template <class OS>
494SyscallReturn
495openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
496         ThreadContext *tc)
497{
498    std::string path;
499
500    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
501        return -EFAULT;
502
503    if (path == "/dev/sysdev0") {
504        // This is a memory-mapped high-resolution timer device on Alpha.
505        // We don't support it, so just punt.
506        warn("Ignoring open(%s, ...)\n", path);
507        return -ENOENT;
508    }
509
510    int tgtFlags = tc->getSyscallArg(1);
511    int mode = tc->getSyscallArg(2);
512    int hostFlags = 0;
513
514    // translate open flags
515    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
516        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
517            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
518            hostFlags |= OS::openFlagTable[i].hostFlag;
519        }
520    }
521
522    // any target flags left?
523    if (tgtFlags != 0)
524        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
525
526#ifdef __CYGWIN32__
527    hostFlags |= O_BINARY;
528#endif
529
530    // Adjust path for current working directory
531    path = process->fullPath(path);
532
533    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
534
535    // open the file
536    int fd = open(path.c_str(), hostFlags, mode);
537
538    return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
539}
540
541
542/// Target chmod() handler.
543template <class OS>
544SyscallReturn
545chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
546          ThreadContext *tc)
547{
548    std::string path;
549
550    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
551        return -EFAULT;
552
553    uint32_t mode = tc->getSyscallArg(1);
554    mode_t hostMode = 0;
555
556    // XXX translate mode flags via OS::something???
557    hostMode = mode;
558
559    // Adjust path for current working directory
560    path = process->fullPath(path);
561
562    // do the chmod
563    int result = chmod(path.c_str(), hostMode);
564    if (result < 0)
565        return -errno;
566
567    return 0;
568}
569
570
571/// Target fchmod() handler.
572template <class OS>
573SyscallReturn
574fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
575           ThreadContext *tc)
576{
577    int fd = tc->getSyscallArg(0);
578    if (fd < 0 || process->sim_fd(fd) < 0) {
579        // doesn't map to any simulator fd: not a valid target fd
580        return -EBADF;
581    }
582
583    uint32_t mode = tc->getSyscallArg(1);
584    mode_t hostMode = 0;
585
586    // XXX translate mode flags via OS::someting???
587    hostMode = mode;
588
589    // do the fchmod
590    int result = fchmod(process->sim_fd(fd), hostMode);
591    if (result < 0)
592        return -errno;
593
594    return 0;
595}
596
597
598/// Target stat() handler.
599template <class OS>
600SyscallReturn
601statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
602         ThreadContext *tc)
603{
604    std::string path;
605
606    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
607    return -EFAULT;
608
609    // Adjust path for current working directory
610    path = process->fullPath(path);
611
612    struct stat hostBuf;
613    int result = stat(path.c_str(), &hostBuf);
614
615    if (result < 0)
616        return -errno;
617
618    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
619
620    return 0;
621}
622
623
624/// Target stat64() handler.
625template <class OS>
626SyscallReturn
627stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
628           ThreadContext *tc)
629{
630    std::string path;
631
632    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
633        return -EFAULT;
634
635    // Adjust path for current working directory
636    path = process->fullPath(path);
637
638#if NO_STAT64
639    struct stat  hostBuf;
640    int result = stat(path.c_str(), &hostBuf);
641#else
642    struct stat64 hostBuf;
643    int result = stat64(path.c_str(), &hostBuf);
644#endif
645
646    if (result < 0)
647        return -errno;
648
649    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
650
651    return 0;
652}
653
654
655/// Target fstat64() handler.
656template <class OS>
657SyscallReturn
658fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
659            ThreadContext *tc)
660{
661    int fd = tc->getSyscallArg(0);
662    if (fd < 0 || process->sim_fd(fd) < 0) {
663        // doesn't map to any simulator fd: not a valid target fd
664        return -EBADF;
665    }
666
667#if NO_STAT64
668    struct stat  hostBuf;
669    int result = fstat(process->sim_fd(fd), &hostBuf);
670#else
671    struct stat64  hostBuf;
672    int result = fstat64(process->sim_fd(fd), &hostBuf);
673#endif
674
675    if (result < 0)
676        return -errno;
677
678    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
679        &hostBuf, (fd == 1));
680
681    return 0;
682}
683
684
685/// Target lstat() handler.
686template <class OS>
687SyscallReturn
688lstatFunc(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    // Adjust path for current working directory
697    path = process->fullPath(path);
698
699    struct stat hostBuf;
700    int result = lstat(path.c_str(), &hostBuf);
701
702    if (result < 0)
703        return -errno;
704
705    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
706
707    return 0;
708}
709
710/// Target lstat64() handler.
711template <class OS>
712SyscallReturn
713lstat64Func(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#if NO_STAT64
725    struct stat hostBuf;
726    int result = lstat(path.c_str(), &hostBuf);
727#else
728    struct stat64 hostBuf;
729    int result = lstat64(path.c_str(), &hostBuf);
730#endif
731
732    if (result < 0)
733        return -errno;
734
735    copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
736
737    return 0;
738}
739
740/// Target fstat() handler.
741template <class OS>
742SyscallReturn
743fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
744          ThreadContext *tc)
745{
746    int fd = process->sim_fd(tc->getSyscallArg(0));
747
748    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
749
750    if (fd < 0)
751        return -EBADF;
752
753    struct stat hostBuf;
754    int result = fstat(fd, &hostBuf);
755
756    if (result < 0)
757        return -errno;
758
759    copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
760        &hostBuf, (fd == 1));
761
762    return 0;
763}
764
765
766/// Target statfs() handler.
767template <class OS>
768SyscallReturn
769statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
770           ThreadContext *tc)
771{
772    std::string path;
773
774    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
775      return -EFAULT;
776
777    // Adjust path for current working directory
778    path = process->fullPath(path);
779
780    struct statfs hostBuf;
781    int result = statfs(path.c_str(), &hostBuf);
782
783    if (result < 0)
784        return -errno;
785
786    OS::copyOutStatfsBuf(tc->getMemPort(),
787            (Addr)(tc->getSyscallArg(1)), &hostBuf);
788
789    return 0;
790}
791
792
793/// Target fstatfs() handler.
794template <class OS>
795SyscallReturn
796fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
797            ThreadContext *tc)
798{
799    int fd = process->sim_fd(tc->getSyscallArg(0));
800
801    if (fd < 0)
802        return -EBADF;
803
804    struct statfs hostBuf;
805    int result = fstatfs(fd, &hostBuf);
806
807    if (result < 0)
808        return -errno;
809
810    OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
811        &hostBuf);
812
813    return 0;
814}
815
816
817/// Target writev() handler.
818template <class OS>
819SyscallReturn
820writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
821           ThreadContext *tc)
822{
823    int fd = tc->getSyscallArg(0);
824    if (fd < 0 || process->sim_fd(fd) < 0) {
825        // doesn't map to any simulator fd: not a valid target fd
826        return -EBADF;
827    }
828
829    TranslatingPort *p = tc->getMemPort();
830    uint64_t tiov_base = tc->getSyscallArg(1);
831    size_t count = tc->getSyscallArg(2);
832    struct iovec hiov[count];
833    for (int i = 0; i < count; ++i)
834    {
835        typename OS::tgt_iovec tiov;
836
837        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
838                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
839        hiov[i].iov_len = gtoh(tiov.iov_len);
840        hiov[i].iov_base = new char [hiov[i].iov_len];
841        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
842                    hiov[i].iov_len);
843    }
844
845    int result = writev(process->sim_fd(fd), hiov, count);
846
847    for (int i = 0; i < count; ++i)
848    {
849        delete [] (char *)hiov[i].iov_base;
850    }
851
852    if (result < 0)
853        return -errno;
854
855    return 0;
856}
857
858
859/// Target mmap() handler.
860///
861/// We don't really handle mmap().  If the target is mmaping an
862/// anonymous region or /dev/zero, we can get away with doing basically
863/// nothing (since memory is initialized to zero and the simulator
864/// doesn't really check addresses anyway).  Always print a warning,
865/// since this could be seriously broken if we're not mapping
866/// /dev/zero.
867//
868/// Someday we should explicitly check for /dev/zero in open, flag the
869/// file descriptor, and fail (or implement!) a non-anonymous mmap to
870/// anything else.
871template <class OS>
872SyscallReturn
873mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
874{
875    Addr start = tc->getSyscallArg(0);
876    uint64_t length = tc->getSyscallArg(1);
877    // int prot = tc->getSyscallArg(2);
878    int flags = tc->getSyscallArg(3);
879    // int fd = p->sim_fd(tc->getSyscallArg(4));
880    // int offset = tc->getSyscallArg(5);
881
882    if ((start  % TheISA::VMPageSize) != 0 ||
883        (length % TheISA::VMPageSize) != 0) {
884        warn("mmap failing: arguments not page-aligned: "
885             "start 0x%x length 0x%x",
886             start, length);
887        return -EINVAL;
888    }
889
890    if (start != 0) {
891        warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
892             start, p->mmap_end);
893    }
894
895    // pick next address from our "mmap region"
896    start = p->mmap_end;
897    p->pTable->allocate(start, length);
898    p->mmap_end += length;
899
900    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
901        warn("allowing mmap of file @ fd %d. "
902             "This will break if not /dev/zero.", tc->getSyscallArg(4));
903    }
904
905    return start;
906}
907
908/// Target getrlimit() handler.
909template <class OS>
910SyscallReturn
911getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
912        ThreadContext *tc)
913{
914    unsigned resource = tc->getSyscallArg(0);
915    TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
916
917    switch (resource) {
918        case OS::TGT_RLIMIT_STACK:
919            // max stack size in bytes: make up a number (2MB for now)
920            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
921            rlp->rlim_cur = htog(rlp->rlim_cur);
922            rlp->rlim_max = htog(rlp->rlim_max);
923            break;
924
925        default:
926            std::cerr << "getrlimitFunc: unimplemented resource " << resource
927                << std::endl;
928            abort();
929            break;
930    }
931
932    rlp.copyOut(tc->getMemPort());
933    return 0;
934}
935
936/// Target gettimeofday() handler.
937template <class OS>
938SyscallReturn
939gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
940        ThreadContext *tc)
941{
942    TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
943
944    getElapsedTime(tp->tv_sec, tp->tv_usec);
945    tp->tv_sec += seconds_since_epoch;
946    tp->tv_sec = htog(tp->tv_sec);
947    tp->tv_usec = htog(tp->tv_usec);
948
949    tp.copyOut(tc->getMemPort());
950
951    return 0;
952}
953
954
955/// Target utimes() handler.
956template <class OS>
957SyscallReturn
958utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
959           ThreadContext *tc)
960{
961    std::string path;
962
963    if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
964      return -EFAULT;
965
966    TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
967    tp.copyIn(tc->getMemPort());
968
969    struct timeval hostTimeval[2];
970    for (int i = 0; i < 2; ++i)
971    {
972        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
973        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
974    }
975
976    // Adjust path for current working directory
977    path = process->fullPath(path);
978
979    int result = utimes(path.c_str(), hostTimeval);
980
981    if (result < 0)
982        return -errno;
983
984    return 0;
985}
986/// Target getrusage() function.
987template <class OS>
988SyscallReturn
989getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
990              ThreadContext *tc)
991{
992    int who = tc->getSyscallArg(0);	// THREAD, SELF, or CHILDREN
993    TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
994
995    rup->ru_utime.tv_sec = 0;
996    rup->ru_utime.tv_usec = 0;
997    rup->ru_stime.tv_sec = 0;
998    rup->ru_stime.tv_usec = 0;
999    rup->ru_maxrss = 0;
1000    rup->ru_ixrss = 0;
1001    rup->ru_idrss = 0;
1002    rup->ru_isrss = 0;
1003    rup->ru_minflt = 0;
1004    rup->ru_majflt = 0;
1005    rup->ru_nswap = 0;
1006    rup->ru_inblock = 0;
1007    rup->ru_oublock = 0;
1008    rup->ru_msgsnd = 0;
1009    rup->ru_msgrcv = 0;
1010    rup->ru_nsignals = 0;
1011    rup->ru_nvcsw = 0;
1012    rup->ru_nivcsw = 0;
1013
1014    switch (who) {
1015      case OS::TGT_RUSAGE_SELF:
1016        getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1017        rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1018        rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1019        break;
1020
1021      case OS::TGT_RUSAGE_CHILDREN:
1022        // do nothing.  We have no child processes, so they take no time.
1023        break;
1024
1025      default:
1026        // don't really handle THREAD or CHILDREN, but just warn and
1027        // plow ahead
1028        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1029             who);
1030    }
1031
1032    rup.copyOut(tc->getMemPort());
1033
1034    return 0;
1035}
1036
1037
1038
1039
1040#endif // __SIM_SYSCALL_EMUL_HH__
1041