syscall_emul.hh revision 10930 
1/*
2 * Copyright (c) 2012-2013, 2015 ARM Limited
3 * Copyright (c) 2015 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder.  You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2003-2005 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Steve Reinhardt
42 *          Kevin Lim
43 */
44
45#ifndef __SIM_SYSCALL_EMUL_HH__
46#define __SIM_SYSCALL_EMUL_HH__
47
48#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
49  defined(__FreeBSD__) || defined(__CYGWIN__) || \
50  defined(__NetBSD__))
51
52///
53/// @file syscall_emul.hh
54///
55/// This file defines objects used to emulate syscalls from the target
56/// application on the host machine.
57
58#ifdef __CYGWIN32__
59#include <sys/fcntl.h>  // for O_BINARY
60#endif
61#include <sys/stat.h>
62#include <sys/time.h>
63#include <sys/uio.h>
64#include <fcntl.h>
65
66#include <cerrno>
67#include <string>
68
69#include "base/chunk_generator.hh"
70#include "base/intmath.hh"      // for RoundUp
71#include "base/misc.hh"
72#include "base/trace.hh"
73#include "base/types.hh"
74#include "config/the_isa.hh"
75#include "cpu/base.hh"
76#include "cpu/thread_context.hh"
77#include "debug/SyscallVerbose.hh"
78#include "mem/page_table.hh"
79#include "sim/byteswap.hh"
80#include "sim/emul_driver.hh"
81#include "sim/process.hh"
82#include "sim/syscall_emul_buf.hh"
83#include "sim/syscallreturn.hh"
84#include "sim/system.hh"
85
86///
87/// System call descriptor.
88///
89class SyscallDesc {
90
91  public:
92
93    /// Typedef for target syscall handler functions.
94    typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
95                           LiveProcess *, ThreadContext *);
96
97    const char *name;   //!< Syscall name (e.g., "open").
98    FuncPtr funcPtr;    //!< Pointer to emulation function.
99    int flags;          //!< Flags (see Flags enum).
100    bool warned;        //!< Have we warned about unimplemented syscall?
101
102    /// Flag values for controlling syscall behavior.
103    enum Flags {
104        /// Don't set return regs according to funcPtr return value.
105        /// Used for syscalls with non-standard return conventions
106        /// that explicitly set the ThreadContext regs (e.g.,
107        /// sigreturn).
108        SuppressReturnValue = 1,
109        WarnOnce = 2
110    };
111
112    /// Constructor.
113    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
114        : name(_name), funcPtr(_funcPtr), flags(_flags), warned(false)
115    {
116    }
117
118    /// Emulate the syscall.  Public interface for calling through funcPtr.
119    void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
120
121    /// Is the WarnOnce flag set?
122    bool warnOnce() const {  return (flags & WarnOnce); }
123};
124
125
126//////////////////////////////////////////////////////////////////////
127//
128// The following emulation functions are generic enough that they
129// don't need to be recompiled for different emulated OS's.  They are
130// defined in sim/syscall_emul.cc.
131//
132//////////////////////////////////////////////////////////////////////
133
134
135/// Handler for unimplemented syscalls that we haven't thought about.
136SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
137                                LiveProcess *p, ThreadContext *tc);
138
139/// Handler for unimplemented syscalls that we never intend to
140/// implement (signal handling, etc.) and should not affect the correct
141/// behavior of the program.  Print a warning only if the appropriate
142/// trace flag is enabled.  Return success to the target program.
143SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
144                         LiveProcess *p, ThreadContext *tc);
145
146/// Target exit() handler: terminate current context.
147SyscallReturn exitFunc(SyscallDesc *desc, int num,
148                       LiveProcess *p, ThreadContext *tc);
149
150/// Target exit_group() handler: terminate simulation. (exit all threads)
151SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
152                       LiveProcess *p, ThreadContext *tc);
153
154/// Target getpagesize() handler.
155SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
156                              LiveProcess *p, ThreadContext *tc);
157
158/// Target brk() handler: set brk address.
159SyscallReturn brkFunc(SyscallDesc *desc, int num,
160                      LiveProcess *p, ThreadContext *tc);
161
162/// Target close() handler.
163SyscallReturn closeFunc(SyscallDesc *desc, int num,
164                        LiveProcess *p, ThreadContext *tc);
165
166/// Target read() handler.
167SyscallReturn readFunc(SyscallDesc *desc, int num,
168                       LiveProcess *p, ThreadContext *tc);
169
170/// Target write() handler.
171SyscallReturn writeFunc(SyscallDesc *desc, int num,
172                        LiveProcess *p, ThreadContext *tc);
173
174/// Target lseek() handler.
175SyscallReturn lseekFunc(SyscallDesc *desc, int num,
176                        LiveProcess *p, ThreadContext *tc);
177
178/// Target _llseek() handler.
179SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
180                        LiveProcess *p, ThreadContext *tc);
181
182/// Target munmap() handler.
183SyscallReturn munmapFunc(SyscallDesc *desc, int num,
184                         LiveProcess *p, ThreadContext *tc);
185
186/// Target gethostname() handler.
187SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
188                              LiveProcess *p, ThreadContext *tc);
189
190/// Target getcwd() handler.
191SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
192                         LiveProcess *p, ThreadContext *tc);
193
194/// Target readlink() handler.
195SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
196                           LiveProcess *p, ThreadContext *tc,
197                           int index = 0);
198SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
199                           LiveProcess *p, ThreadContext *tc);
200
201/// Target unlink() handler.
202SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
203                           LiveProcess *p, ThreadContext *tc,
204                           int index);
205SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
206                         LiveProcess *p, ThreadContext *tc);
207
208/// Target mkdir() handler.
209SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
210                        LiveProcess *p, ThreadContext *tc);
211
212/// Target rename() handler.
213SyscallReturn renameFunc(SyscallDesc *desc, int num,
214                         LiveProcess *p, ThreadContext *tc);
215
216
217/// Target truncate() handler.
218SyscallReturn truncateFunc(SyscallDesc *desc, int num,
219                           LiveProcess *p, ThreadContext *tc);
220
221
222/// Target ftruncate() handler.
223SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
224                            LiveProcess *p, ThreadContext *tc);
225
226
227/// Target truncate64() handler.
228SyscallReturn truncate64Func(SyscallDesc *desc, int num,
229                             LiveProcess *p, ThreadContext *tc);
230
231/// Target ftruncate64() handler.
232SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
233                              LiveProcess *p, ThreadContext *tc);
234
235
236/// Target umask() handler.
237SyscallReturn umaskFunc(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/// Target clone() handler.
291SyscallReturn cloneFunc(SyscallDesc *desc, int num,
292                               LiveProcess *p, ThreadContext *tc);
293
294/// Target access() handler
295SyscallReturn accessFunc(SyscallDesc *desc, int num,
296                               LiveProcess *p, ThreadContext *tc);
297SyscallReturn accessFunc(SyscallDesc *desc, int num,
298                               LiveProcess *p, ThreadContext *tc,
299                               int index);
300
301/// Futex system call
302///  Implemented by Daniel Sanchez
303///  Used by printf's in multi-threaded apps
304template <class OS>
305SyscallReturn
306futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
307          ThreadContext *tc)
308{
309    int index_uaddr = 0;
310    int index_op = 1;
311    int index_val = 2;
312    int index_timeout = 3;
313
314    uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
315    int op = process->getSyscallArg(tc, index_op);
316    int val = process->getSyscallArg(tc, index_val);
317    uint64_t timeout = process->getSyscallArg(tc, index_timeout);
318
319    std::map<uint64_t, std::list<ThreadContext *> * >
320        &futex_map = tc->getSystemPtr()->futexMap;
321
322    DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
323            uaddr, op, val);
324
325    op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
326
327    if (op == OS::TGT_FUTEX_WAIT) {
328        if (timeout != 0) {
329            warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
330                 "we'll wait indefinitely");
331        }
332
333        uint8_t *buf = new uint8_t[sizeof(int)];
334        tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
335        int mem_val = *((int *)buf);
336        delete buf;
337
338        if(val != mem_val) {
339            DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
340                                    "expected: %d\n", mem_val, val);
341            return -OS::TGT_EWOULDBLOCK;
342        }
343
344        // Queue the thread context
345        std::list<ThreadContext *> * tcWaitList;
346        if (futex_map.count(uaddr)) {
347            tcWaitList = futex_map.find(uaddr)->second;
348        } else {
349            tcWaitList = new std::list<ThreadContext *>();
350            futex_map.insert(std::pair< uint64_t,
351                            std::list<ThreadContext *> * >(uaddr, tcWaitList));
352        }
353        tcWaitList->push_back(tc);
354        DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
355                                "thread context\n");
356        tc->suspend();
357        return 0;
358    } else if (op == OS::TGT_FUTEX_WAKE){
359        int wokenUp = 0;
360        std::list<ThreadContext *> * tcWaitList;
361        if (futex_map.count(uaddr)) {
362            tcWaitList = futex_map.find(uaddr)->second;
363            while (tcWaitList->size() > 0 && wokenUp < val) {
364                tcWaitList->front()->activate();
365                tcWaitList->pop_front();
366                wokenUp++;
367            }
368            if(tcWaitList->empty()) {
369                futex_map.erase(uaddr);
370                delete tcWaitList;
371            }
372        }
373        DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
374                                "thread contexts\n", wokenUp);
375        return wokenUp;
376    } else {
377        warn("sys_futex: op %d is not implemented, just returning...", op);
378        return 0;
379    }
380
381}
382
383
384/// Pseudo Funcs  - These functions use a different return convension,
385/// returning a second value in a register other than the normal return register
386SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
387                             LiveProcess *process, ThreadContext *tc);
388
389/// Target getpidPseudo() handler.
390SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
391                               LiveProcess *p, ThreadContext *tc);
392
393/// Target getuidPseudo() handler.
394SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
395                               LiveProcess *p, ThreadContext *tc);
396
397/// Target getgidPseudo() handler.
398SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
399                               LiveProcess *p, ThreadContext *tc);
400
401
402/// A readable name for 1,000,000, for converting microseconds to seconds.
403const int one_million = 1000000;
404/// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
405const int one_billion = 1000000000;
406
407/// Approximate seconds since the epoch (1/1/1970).  About a billion,
408/// by my reckoning.  We want to keep this a constant (not use the
409/// real-world time) to keep simulations repeatable.
410const unsigned seconds_since_epoch = 1000000000;
411
412/// Helper function to convert current elapsed time to seconds and
413/// microseconds.
414template <class T1, class T2>
415void
416getElapsedTimeMicro(T1 &sec, T2 &usec)
417{
418    uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
419    sec = elapsed_usecs / one_million;
420    usec = elapsed_usecs % one_million;
421}
422
423/// Helper function to convert current elapsed time to seconds and
424/// nanoseconds.
425template <class T1, class T2>
426void
427getElapsedTimeNano(T1 &sec, T2 &nsec)
428{
429    uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
430    sec = elapsed_nsecs / one_billion;
431    nsec = elapsed_nsecs % one_billion;
432}
433
434//////////////////////////////////////////////////////////////////////
435//
436// The following emulation functions are generic, but need to be
437// templated to account for differences in types, constants, etc.
438//
439//////////////////////////////////////////////////////////////////////
440
441#if NO_STAT64
442    typedef struct stat hst_stat;
443    typedef struct stat hst_stat64;
444#else
445    typedef struct stat hst_stat;
446    typedef struct stat64 hst_stat64;
447#endif
448
449//// Helper function to convert a host stat buffer to a target stat
450//// buffer.  Also copies the target buffer out to the simulated
451//// memory space.  Used by stat(), fstat(), and lstat().
452
453template <typename target_stat, typename host_stat>
454static void
455convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
456{
457    using namespace TheISA;
458
459    if (fakeTTY)
460        tgt->st_dev = 0xA;
461    else
462        tgt->st_dev = host->st_dev;
463    tgt->st_dev = TheISA::htog(tgt->st_dev);
464    tgt->st_ino = host->st_ino;
465    tgt->st_ino = TheISA::htog(tgt->st_ino);
466    tgt->st_mode = host->st_mode;
467    if (fakeTTY) {
468        // Claim to be a character device
469        tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
470        tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
471    }
472    tgt->st_mode = TheISA::htog(tgt->st_mode);
473    tgt->st_nlink = host->st_nlink;
474    tgt->st_nlink = TheISA::htog(tgt->st_nlink);
475    tgt->st_uid = host->st_uid;
476    tgt->st_uid = TheISA::htog(tgt->st_uid);
477    tgt->st_gid = host->st_gid;
478    tgt->st_gid = TheISA::htog(tgt->st_gid);
479    if (fakeTTY)
480        tgt->st_rdev = 0x880d;
481    else
482        tgt->st_rdev = host->st_rdev;
483    tgt->st_rdev = TheISA::htog(tgt->st_rdev);
484    tgt->st_size = host->st_size;
485    tgt->st_size = TheISA::htog(tgt->st_size);
486    tgt->st_atimeX = host->st_atime;
487    tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
488    tgt->st_mtimeX = host->st_mtime;
489    tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
490    tgt->st_ctimeX = host->st_ctime;
491    tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
492    // Force the block size to be 8k. This helps to ensure buffered io works
493    // consistently across different hosts.
494    tgt->st_blksize = 0x2000;
495    tgt->st_blksize = TheISA::htog(tgt->st_blksize);
496    tgt->st_blocks = host->st_blocks;
497    tgt->st_blocks = TheISA::htog(tgt->st_blocks);
498}
499
500// Same for stat64
501
502template <typename target_stat, typename host_stat64>
503static void
504convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
505{
506    using namespace TheISA;
507
508    convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
509#if defined(STAT_HAVE_NSEC)
510    tgt->st_atime_nsec = host->st_atime_nsec;
511    tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
512    tgt->st_mtime_nsec = host->st_mtime_nsec;
513    tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
514    tgt->st_ctime_nsec = host->st_ctime_nsec;
515    tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
516#else
517    tgt->st_atime_nsec = 0;
518    tgt->st_mtime_nsec = 0;
519    tgt->st_ctime_nsec = 0;
520#endif
521}
522
523//Here are a couple convenience functions
524template<class OS>
525static void
526copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
527        hst_stat *host, bool fakeTTY = false)
528{
529    typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
530    tgt_stat_buf tgt(addr);
531    convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
532    tgt.copyOut(mem);
533}
534
535template<class OS>
536static void
537copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
538        hst_stat64 *host, bool fakeTTY = false)
539{
540    typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
541    tgt_stat_buf tgt(addr);
542    convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
543    tgt.copyOut(mem);
544}
545
546/// Target ioctl() handler.  For the most part, programs call ioctl()
547/// only to find out if their stdout is a tty, to determine whether to
548/// do line or block buffering.  We always claim that output fds are
549/// not TTYs to provide repeatable results.
550template <class OS>
551SyscallReturn
552ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
553          ThreadContext *tc)
554{
555    int index = 0;
556    int tgt_fd = process->getSyscallArg(tc, index);
557    unsigned req = process->getSyscallArg(tc, index);
558
559    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req);
560
561    FDEntry *fde = process->get_fd_entry(tgt_fd);
562
563    if (fde == NULL) {
564        // doesn't map to any simulator fd: not a valid target fd
565        return -EBADF;
566    }
567
568    if (fde->driver != NULL) {
569        return fde->driver->ioctl(process, tc, req);
570    }
571
572    if (OS::isTtyReq(req)) {
573        return -ENOTTY;
574    }
575
576    warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
577         tgt_fd, req, tc->pcState());
578    return -ENOTTY;
579}
580
581template <class OS>
582static SyscallReturn
583openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
584         ThreadContext *tc, int index)
585{
586    std::string path;
587
588    if (!tc->getMemProxy().tryReadString(path,
589                process->getSyscallArg(tc, index)))
590        return -EFAULT;
591
592    int tgtFlags = process->getSyscallArg(tc, index);
593    int mode = process->getSyscallArg(tc, index);
594    int hostFlags = 0;
595
596    // translate open flags
597    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
598        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
599            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
600            hostFlags |= OS::openFlagTable[i].hostFlag;
601        }
602    }
603
604    // any target flags left?
605    if (tgtFlags != 0)
606        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
607
608#ifdef __CYGWIN32__
609    hostFlags |= O_BINARY;
610#endif
611
612    // Adjust path for current working directory
613    path = process->fullPath(path);
614
615    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
616
617    if (startswith(path, "/dev/")) {
618        std::string filename = path.substr(strlen("/dev/"));
619        if (filename == "sysdev0") {
620            // This is a memory-mapped high-resolution timer device on Alpha.
621            // We don't support it, so just punt.
622            warn("Ignoring open(%s, ...)\n", path);
623            return -ENOENT;
624        }
625
626        EmulatedDriver *drv = process->findDriver(filename);
627        if (drv != NULL) {
628            // the driver's open method will allocate a fd from the
629            // process if necessary.
630            return drv->open(process, tc, mode, hostFlags);
631        }
632
633        // fall through here for pass through to host devices, such as
634        // /dev/zero
635    }
636
637    int fd;
638    int local_errno;
639    if (startswith(path, "/proc/") || startswith(path, "/system/") ||
640        startswith(path, "/platform/") || startswith(path, "/sys/")) {
641        // It's a proc/sys entry and requires special handling
642        fd = OS::openSpecialFile(path, process, tc);
643        local_errno = ENOENT;
644     } else {
645        // open the file
646        fd = open(path.c_str(), hostFlags, mode);
647        local_errno = errno;
648     }
649
650    if (fd == -1)
651        return -local_errno;
652
653    return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
654}
655
656/// Target open() handler.
657template <class OS>
658SyscallReturn
659openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
660         ThreadContext *tc)
661{
662    return openFunc<OS>(desc, callnum, process, tc, 0);
663}
664
665/// Target openat() handler.
666template <class OS>
667SyscallReturn
668openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
669         ThreadContext *tc)
670{
671    int index = 0;
672    int dirfd = process->getSyscallArg(tc, index);
673    if (dirfd != OS::TGT_AT_FDCWD)
674        warn("openat: first argument not AT_FDCWD; unlikely to work");
675    return openFunc<OS>(desc, callnum, process, tc, 1);
676}
677
678/// Target unlinkat() handler.
679template <class OS>
680SyscallReturn
681unlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
682             ThreadContext *tc)
683{
684    int index = 0;
685    int dirfd = process->getSyscallArg(tc, index);
686    if (dirfd != OS::TGT_AT_FDCWD)
687        warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
688
689    return unlinkHelper(desc, callnum, process, tc, 1);
690}
691
692/// Target facessat() handler
693template <class OS>
694SyscallReturn
695faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
696        ThreadContext *tc)
697{
698    int index = 0;
699    int dirfd = process->getSyscallArg(tc, index);
700    if (dirfd != OS::TGT_AT_FDCWD)
701        warn("faccessat: first argument not AT_FDCWD; unlikely to work");
702    return accessFunc(desc, callnum, process, tc, 1);
703}
704
705/// Target readlinkat() handler
706template <class OS>
707SyscallReturn
708readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
709        ThreadContext *tc)
710{
711    int index = 0;
712    int dirfd = process->getSyscallArg(tc, index);
713    if (dirfd != OS::TGT_AT_FDCWD)
714        warn("openat: first argument not AT_FDCWD; unlikely to work");
715    return readlinkFunc(desc, callnum, process, tc, 1);
716}
717
718/// Target renameat() handler.
719template <class OS>
720SyscallReturn
721renameatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
722             ThreadContext *tc)
723{
724    int index = 0;
725
726    int olddirfd = process->getSyscallArg(tc, index);
727    if (olddirfd != OS::TGT_AT_FDCWD)
728        warn("renameat: first argument not AT_FDCWD; unlikely to work");
729
730    std::string old_name;
731
732    if (!tc->getMemProxy().tryReadString(old_name,
733                                         process->getSyscallArg(tc, index)))
734        return -EFAULT;
735
736    int newdirfd = process->getSyscallArg(tc, index);
737    if (newdirfd != OS::TGT_AT_FDCWD)
738        warn("renameat: third argument not AT_FDCWD; unlikely to work");
739
740    std::string new_name;
741
742    if (!tc->getMemProxy().tryReadString(new_name,
743                                         process->getSyscallArg(tc, index)))
744        return -EFAULT;
745
746    // Adjust path for current working directory
747    old_name = process->fullPath(old_name);
748    new_name = process->fullPath(new_name);
749
750    int result = rename(old_name.c_str(), new_name.c_str());
751    return (result == -1) ? -errno : result;
752}
753
754/// Target sysinfo() handler.
755template <class OS>
756SyscallReturn
757sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
758         ThreadContext *tc)
759{
760
761    int index = 0;
762    TypedBufferArg<typename OS::tgt_sysinfo>
763        sysinfo(process->getSyscallArg(tc, index));
764
765    sysinfo->uptime=seconds_since_epoch;
766    sysinfo->totalram=process->system->memSize();
767
768    sysinfo.copyOut(tc->getMemProxy());
769
770    return 0;
771}
772
773/// Target chmod() handler.
774template <class OS>
775SyscallReturn
776chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
777          ThreadContext *tc)
778{
779    std::string path;
780
781    int index = 0;
782    if (!tc->getMemProxy().tryReadString(path,
783                process->getSyscallArg(tc, index))) {
784        return -EFAULT;
785    }
786
787    uint32_t mode = process->getSyscallArg(tc, index);
788    mode_t hostMode = 0;
789
790    // XXX translate mode flags via OS::something???
791    hostMode = mode;
792
793    // Adjust path for current working directory
794    path = process->fullPath(path);
795
796    // do the chmod
797    int result = chmod(path.c_str(), hostMode);
798    if (result < 0)
799        return -errno;
800
801    return 0;
802}
803
804
805/// Target fchmod() handler.
806template <class OS>
807SyscallReturn
808fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
809           ThreadContext *tc)
810{
811    int index = 0;
812    int fd = process->getSyscallArg(tc, index);
813    if (fd < 0 || process->sim_fd(fd) < 0) {
814        // doesn't map to any simulator fd: not a valid target fd
815        return -EBADF;
816    }
817
818    uint32_t mode = process->getSyscallArg(tc, index);
819    mode_t hostMode = 0;
820
821    // XXX translate mode flags via OS::someting???
822    hostMode = mode;
823
824    // do the fchmod
825    int result = fchmod(process->sim_fd(fd), hostMode);
826    if (result < 0)
827        return -errno;
828
829    return 0;
830}
831
832/// Target mremap() handler.
833template <class OS>
834SyscallReturn
835mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
836{
837    int index = 0;
838    Addr start = process->getSyscallArg(tc, index);
839    uint64_t old_length = process->getSyscallArg(tc, index);
840    uint64_t new_length = process->getSyscallArg(tc, index);
841    uint64_t flags = process->getSyscallArg(tc, index);
842    uint64_t provided_address = 0;
843    bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
844
845    if (use_provided_address)
846        provided_address = process->getSyscallArg(tc, index);
847
848    if ((start % TheISA::PageBytes != 0) ||
849        (provided_address % TheISA::PageBytes != 0)) {
850        warn("mremap failing: arguments not page aligned");
851        return -EINVAL;
852    }
853
854    new_length = roundUp(new_length, TheISA::PageBytes);
855
856    if (new_length > old_length) {
857        if ((start + old_length) == process->mmap_end &&
858            (!use_provided_address || provided_address == start)) {
859            uint64_t diff = new_length - old_length;
860            process->allocateMem(process->mmap_end, diff);
861            process->mmap_end += diff;
862            return start;
863        } else {
864            if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
865                warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
866                return -ENOMEM;
867            } else {
868                uint64_t new_start = use_provided_address ?
869                    provided_address : process->mmap_end;
870                process->pTable->remap(start, old_length, new_start);
871                warn("mremapping to new vaddr %08p-%08p, adding %d\n",
872                     new_start, new_start + new_length,
873                     new_length - old_length);
874                // add on the remaining unallocated pages
875                process->allocateMem(new_start + old_length,
876                                     new_length - old_length,
877                                     use_provided_address /* clobber */);
878                if (!use_provided_address)
879                    process->mmap_end += new_length;
880                if (use_provided_address &&
881                    new_start + new_length > process->mmap_end) {
882                    // something fishy going on here, at least notify the user
883                    // @todo: increase mmap_end?
884                    warn("mmap region limit exceeded with MREMAP_FIXED\n");
885                }
886                warn("returning %08p as start\n", new_start);
887                return new_start;
888            }
889        }
890    } else {
891        if (use_provided_address && provided_address != start)
892            process->pTable->remap(start, new_length, provided_address);
893        process->pTable->unmap(start + new_length, old_length - new_length);
894        return use_provided_address ? provided_address : start;
895    }
896}
897
898/// Target stat() handler.
899template <class OS>
900SyscallReturn
901statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
902         ThreadContext *tc)
903{
904    std::string path;
905
906    int index = 0;
907    if (!tc->getMemProxy().tryReadString(path,
908                process->getSyscallArg(tc, index))) {
909        return -EFAULT;
910    }
911    Addr bufPtr = process->getSyscallArg(tc, index);
912
913    // Adjust path for current working directory
914    path = process->fullPath(path);
915
916    struct stat hostBuf;
917    int result = stat(path.c_str(), &hostBuf);
918
919    if (result < 0)
920        return -errno;
921
922    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
923
924    return 0;
925}
926
927
928/// Target stat64() handler.
929template <class OS>
930SyscallReturn
931stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
932           ThreadContext *tc)
933{
934    std::string path;
935
936    int index = 0;
937    if (!tc->getMemProxy().tryReadString(path,
938                process->getSyscallArg(tc, index)))
939        return -EFAULT;
940    Addr bufPtr = process->getSyscallArg(tc, index);
941
942    // Adjust path for current working directory
943    path = process->fullPath(path);
944
945#if NO_STAT64
946    struct stat  hostBuf;
947    int result = stat(path.c_str(), &hostBuf);
948#else
949    struct stat64 hostBuf;
950    int result = stat64(path.c_str(), &hostBuf);
951#endif
952
953    if (result < 0)
954        return -errno;
955
956    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
957
958    return 0;
959}
960
961
962/// Target fstatat64() handler.
963template <class OS>
964SyscallReturn
965fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
966              ThreadContext *tc)
967{
968    int index = 0;
969    int dirfd = process->getSyscallArg(tc, index);
970    if (dirfd != OS::TGT_AT_FDCWD)
971        warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
972
973    std::string path;
974    if (!tc->getMemProxy().tryReadString(path,
975                process->getSyscallArg(tc, index)))
976        return -EFAULT;
977    Addr bufPtr = process->getSyscallArg(tc, index);
978
979    // Adjust path for current working directory
980    path = process->fullPath(path);
981
982#if NO_STAT64
983    struct stat  hostBuf;
984    int result = stat(path.c_str(), &hostBuf);
985#else
986    struct stat64 hostBuf;
987    int result = stat64(path.c_str(), &hostBuf);
988#endif
989
990    if (result < 0)
991        return -errno;
992
993    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
994
995    return 0;
996}
997
998
999/// Target fstat64() handler.
1000template <class OS>
1001SyscallReturn
1002fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1003            ThreadContext *tc)
1004{
1005    int index = 0;
1006    int fd = process->getSyscallArg(tc, index);
1007    Addr bufPtr = process->getSyscallArg(tc, index);
1008    if (fd < 0 || process->sim_fd(fd) < 0) {
1009        // doesn't map to any simulator fd: not a valid target fd
1010        return -EBADF;
1011    }
1012
1013#if NO_STAT64
1014    struct stat  hostBuf;
1015    int result = fstat(process->sim_fd(fd), &hostBuf);
1016#else
1017    struct stat64  hostBuf;
1018    int result = fstat64(process->sim_fd(fd), &hostBuf);
1019#endif
1020
1021    if (result < 0)
1022        return -errno;
1023
1024    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1025
1026    return 0;
1027}
1028
1029
1030/// Target lstat() handler.
1031template <class OS>
1032SyscallReturn
1033lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1034          ThreadContext *tc)
1035{
1036    std::string path;
1037
1038    int index = 0;
1039    if (!tc->getMemProxy().tryReadString(path,
1040                process->getSyscallArg(tc, index))) {
1041        return -EFAULT;
1042    }
1043    Addr bufPtr = process->getSyscallArg(tc, index);
1044
1045    // Adjust path for current working directory
1046    path = process->fullPath(path);
1047
1048    struct stat hostBuf;
1049    int result = lstat(path.c_str(), &hostBuf);
1050
1051    if (result < 0)
1052        return -errno;
1053
1054    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1055
1056    return 0;
1057}
1058
1059/// Target lstat64() handler.
1060template <class OS>
1061SyscallReturn
1062lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1063            ThreadContext *tc)
1064{
1065    std::string path;
1066
1067    int index = 0;
1068    if (!tc->getMemProxy().tryReadString(path,
1069                process->getSyscallArg(tc, index))) {
1070        return -EFAULT;
1071    }
1072    Addr bufPtr = process->getSyscallArg(tc, index);
1073
1074    // Adjust path for current working directory
1075    path = process->fullPath(path);
1076
1077#if NO_STAT64
1078    struct stat hostBuf;
1079    int result = lstat(path.c_str(), &hostBuf);
1080#else
1081    struct stat64 hostBuf;
1082    int result = lstat64(path.c_str(), &hostBuf);
1083#endif
1084
1085    if (result < 0)
1086        return -errno;
1087
1088    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1089
1090    return 0;
1091}
1092
1093/// Target fstat() handler.
1094template <class OS>
1095SyscallReturn
1096fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1097          ThreadContext *tc)
1098{
1099    int index = 0;
1100    int fd = process->sim_fd(process->getSyscallArg(tc, index));
1101    Addr bufPtr = process->getSyscallArg(tc, index);
1102
1103    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
1104
1105    if (fd < 0)
1106        return -EBADF;
1107
1108    struct stat hostBuf;
1109    int result = fstat(fd, &hostBuf);
1110
1111    if (result < 0)
1112        return -errno;
1113
1114    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1115
1116    return 0;
1117}
1118
1119
1120/// Target statfs() handler.
1121template <class OS>
1122SyscallReturn
1123statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1124           ThreadContext *tc)
1125{
1126    std::string path;
1127
1128    int index = 0;
1129    if (!tc->getMemProxy().tryReadString(path,
1130                process->getSyscallArg(tc, index))) {
1131        return -EFAULT;
1132    }
1133    Addr bufPtr = process->getSyscallArg(tc, index);
1134
1135    // Adjust path for current working directory
1136    path = process->fullPath(path);
1137
1138    struct statfs hostBuf;
1139    int result = statfs(path.c_str(), &hostBuf);
1140
1141    if (result < 0)
1142        return -errno;
1143
1144    OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1145
1146    return 0;
1147}
1148
1149
1150/// Target fstatfs() handler.
1151template <class OS>
1152SyscallReturn
1153fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1154            ThreadContext *tc)
1155{
1156    int index = 0;
1157    int fd = process->sim_fd(process->getSyscallArg(tc, index));
1158    Addr bufPtr = process->getSyscallArg(tc, index);
1159
1160    if (fd < 0)
1161        return -EBADF;
1162
1163    struct statfs hostBuf;
1164    int result = fstatfs(fd, &hostBuf);
1165
1166    if (result < 0)
1167        return -errno;
1168
1169    OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1170
1171    return 0;
1172}
1173
1174
1175/// Target writev() handler.
1176template <class OS>
1177SyscallReturn
1178writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1179           ThreadContext *tc)
1180{
1181    int index = 0;
1182    int fd = process->getSyscallArg(tc, index);
1183    if (fd < 0 || process->sim_fd(fd) < 0) {
1184        // doesn't map to any simulator fd: not a valid target fd
1185        return -EBADF;
1186    }
1187
1188    SETranslatingPortProxy &p = tc->getMemProxy();
1189    uint64_t tiov_base = process->getSyscallArg(tc, index);
1190    size_t count = process->getSyscallArg(tc, index);
1191    struct iovec hiov[count];
1192    for (size_t i = 0; i < count; ++i) {
1193        typename OS::tgt_iovec tiov;
1194
1195        p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1196                   (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1197        hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1198        hiov[i].iov_base = new char [hiov[i].iov_len];
1199        p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1200                   hiov[i].iov_len);
1201    }
1202
1203    int result = writev(process->sim_fd(fd), hiov, count);
1204
1205    for (size_t i = 0; i < count; ++i)
1206        delete [] (char *)hiov[i].iov_base;
1207
1208    if (result < 0)
1209        return -errno;
1210
1211    return result;
1212}
1213
1214
1215/// Target mmap() handler.
1216///
1217/// We don't really handle mmap().  If the target is mmaping an
1218/// anonymous region or /dev/zero, we can get away with doing basically
1219/// nothing (since memory is initialized to zero and the simulator
1220/// doesn't really check addresses anyway).
1221///
1222template <class OS>
1223SyscallReturn
1224mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1225{
1226    int index = 0;
1227    Addr start = p->getSyscallArg(tc, index);
1228    uint64_t length = p->getSyscallArg(tc, index);
1229    index++; // int prot = p->getSyscallArg(tc, index);
1230    int flags = p->getSyscallArg(tc, index);
1231    int tgt_fd = p->getSyscallArg(tc, index);
1232    int offset = p->getSyscallArg(tc, index);
1233
1234    if (length > 0x100000000ULL)
1235        warn("mmap length argument %#x is unreasonably large.\n", length);
1236
1237    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1238        FDEntry *fde = p->get_fd_entry(tgt_fd);
1239        if (!fde || fde->fd < 0) {
1240            warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1241            return -EBADF;
1242        }
1243
1244        if (fde->filename != "/dev/zero") {
1245            // This is very likely broken, but leave a warning here
1246            // (rather than panic) in case /dev/zero is known by
1247            // another name on some platform
1248            warn("allowing mmap of file %s; mmap not supported on files"
1249                 " other than /dev/zero\n", fde->filename);
1250        }
1251    }
1252
1253    length = roundUp(length, TheISA::PageBytes);
1254
1255    if ((start  % TheISA::PageBytes) != 0 ||
1256        (offset % TheISA::PageBytes) != 0) {
1257        warn("mmap failing: arguments not page-aligned: "
1258             "start 0x%x offset 0x%x",
1259             start, offset);
1260        return -EINVAL;
1261    }
1262
1263    // are we ok with clobbering existing mappings?  only set this to
1264    // true if the user has been warned.
1265    bool clobber = false;
1266
1267    // try to use the caller-provided address if there is one
1268    bool use_provided_address = (start != 0);
1269
1270    if (use_provided_address) {
1271        // check to see if the desired address is already in use
1272        if (!p->pTable->isUnmapped(start, length)) {
1273            // there are existing mappings in the desired range
1274            // whether we clobber them or not depends on whether the caller
1275            // specified MAP_FIXED
1276            if (flags & OS::TGT_MAP_FIXED) {
1277                // MAP_FIXED specified: map attempt fails
1278                return -EINVAL;
1279            } else {
1280                // MAP_FIXED not specified: ignore suggested start address
1281                warn("mmap: ignoring suggested map address 0x%x\n", start);
1282                use_provided_address = false;
1283            }
1284        }
1285    }
1286
1287    if (!use_provided_address) {
1288        // no address provided, or provided address unusable:
1289        // pick next address from our "mmap region"
1290        if (OS::mmapGrowsDown()) {
1291            start = p->mmap_end - length;
1292            p->mmap_end = start;
1293        } else {
1294            start = p->mmap_end;
1295            p->mmap_end += length;
1296        }
1297    }
1298
1299    p->allocateMem(start, length, clobber);
1300
1301    return start;
1302}
1303
1304/// Target getrlimit() handler.
1305template <class OS>
1306SyscallReturn
1307getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1308        ThreadContext *tc)
1309{
1310    int index = 0;
1311    unsigned resource = process->getSyscallArg(tc, index);
1312    TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1313
1314    switch (resource) {
1315        case OS::TGT_RLIMIT_STACK:
1316            // max stack size in bytes: make up a number (8MB for now)
1317            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1318            rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1319            rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1320            break;
1321
1322        case OS::TGT_RLIMIT_DATA:
1323            // max data segment size in bytes: make up a number
1324            rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1325            rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1326            rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1327            break;
1328
1329        default:
1330            warn("getrlimit: unimplemented resource %d", resource);
1331            return -EINVAL;
1332            break;
1333    }
1334
1335    rlp.copyOut(tc->getMemProxy());
1336    return 0;
1337}
1338
1339/// Target clock_gettime() function.
1340template <class OS>
1341SyscallReturn
1342clock_gettimeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1343{
1344    int index = 1;
1345    //int clk_id = p->getSyscallArg(tc, index);
1346    TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1347
1348    getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1349    tp->tv_sec += seconds_since_epoch;
1350    tp->tv_sec = TheISA::htog(tp->tv_sec);
1351    tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1352
1353    tp.copyOut(tc->getMemProxy());
1354
1355    return 0;
1356}
1357
1358/// Target gettimeofday() handler.
1359template <class OS>
1360SyscallReturn
1361gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1362        ThreadContext *tc)
1363{
1364    int index = 0;
1365    TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1366
1367    getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1368    tp->tv_sec += seconds_since_epoch;
1369    tp->tv_sec = TheISA::htog(tp->tv_sec);
1370    tp->tv_usec = TheISA::htog(tp->tv_usec);
1371
1372    tp.copyOut(tc->getMemProxy());
1373
1374    return 0;
1375}
1376
1377
1378/// Target utimes() handler.
1379template <class OS>
1380SyscallReturn
1381utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1382           ThreadContext *tc)
1383{
1384    std::string path;
1385
1386    int index = 0;
1387    if (!tc->getMemProxy().tryReadString(path,
1388                process->getSyscallArg(tc, index))) {
1389        return -EFAULT;
1390    }
1391
1392    TypedBufferArg<typename OS::timeval [2]>
1393        tp(process->getSyscallArg(tc, index));
1394    tp.copyIn(tc->getMemProxy());
1395
1396    struct timeval hostTimeval[2];
1397    for (int i = 0; i < 2; ++i)
1398    {
1399        hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1400        hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1401    }
1402
1403    // Adjust path for current working directory
1404    path = process->fullPath(path);
1405
1406    int result = utimes(path.c_str(), hostTimeval);
1407
1408    if (result < 0)
1409        return -errno;
1410
1411    return 0;
1412}
1413/// Target getrusage() function.
1414template <class OS>
1415SyscallReturn
1416getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1417              ThreadContext *tc)
1418{
1419    int index = 0;
1420    int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1421    TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1422
1423    rup->ru_utime.tv_sec = 0;
1424    rup->ru_utime.tv_usec = 0;
1425    rup->ru_stime.tv_sec = 0;
1426    rup->ru_stime.tv_usec = 0;
1427    rup->ru_maxrss = 0;
1428    rup->ru_ixrss = 0;
1429    rup->ru_idrss = 0;
1430    rup->ru_isrss = 0;
1431    rup->ru_minflt = 0;
1432    rup->ru_majflt = 0;
1433    rup->ru_nswap = 0;
1434    rup->ru_inblock = 0;
1435    rup->ru_oublock = 0;
1436    rup->ru_msgsnd = 0;
1437    rup->ru_msgrcv = 0;
1438    rup->ru_nsignals = 0;
1439    rup->ru_nvcsw = 0;
1440    rup->ru_nivcsw = 0;
1441
1442    switch (who) {
1443      case OS::TGT_RUSAGE_SELF:
1444        getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1445        rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1446        rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1447        break;
1448
1449      case OS::TGT_RUSAGE_CHILDREN:
1450        // do nothing.  We have no child processes, so they take no time.
1451        break;
1452
1453      default:
1454        // don't really handle THREAD or CHILDREN, but just warn and
1455        // plow ahead
1456        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1457             who);
1458    }
1459
1460    rup.copyOut(tc->getMemProxy());
1461
1462    return 0;
1463}
1464
1465/// Target times() function.
1466template <class OS>
1467SyscallReturn
1468timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1469           ThreadContext *tc)
1470{
1471    int index = 0;
1472    TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1473
1474    // Fill in the time structure (in clocks)
1475    int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1476    bufp->tms_utime = clocks;
1477    bufp->tms_stime = 0;
1478    bufp->tms_cutime = 0;
1479    bufp->tms_cstime = 0;
1480
1481    // Convert to host endianness
1482    bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1483
1484    // Write back
1485    bufp.copyOut(tc->getMemProxy());
1486
1487    // Return clock ticks since system boot
1488    return clocks;
1489}
1490
1491/// Target time() function.
1492template <class OS>
1493SyscallReturn
1494timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1495           ThreadContext *tc)
1496{
1497    typename OS::time_t sec, usec;
1498    getElapsedTimeMicro(sec, usec);
1499    sec += seconds_since_epoch;
1500
1501    int index = 0;
1502    Addr taddr = (Addr)process->getSyscallArg(tc, index);
1503    if(taddr != 0) {
1504        typename OS::time_t t = sec;
1505        t = TheISA::htog(t);
1506        SETranslatingPortProxy &p = tc->getMemProxy();
1507        p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1508    }
1509    return sec;
1510}
1511
1512
1513#endif // __SIM_SYSCALL_EMUL_HH__
1514