syscall_emul.hh revision 10831:fbdaa08aaa42 
1/*
2 * Copyright (c) 2012-2013 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 fd = process->getSyscallArg(tc, index);
557    unsigned req = process->getSyscallArg(tc, index);
558
559    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
560
561    Process::FdMap *fdObj = process->sim_fd_obj(fd);
562
563    if (fdObj == NULL) {
564        // doesn't map to any simulator fd: not a valid target fd
565        return -EBADF;
566    }
567
568    if (fdObj->driver != NULL) {
569        return fdObj->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         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 sysinfo() handler.
719template <class OS>
720SyscallReturn
721sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
722         ThreadContext *tc)
723{
724
725    int index = 0;
726    TypedBufferArg<typename OS::tgt_sysinfo>
727        sysinfo(process->getSyscallArg(tc, index));
728
729    sysinfo->uptime=seconds_since_epoch;
730    sysinfo->totalram=process->system->memSize();
731
732    sysinfo.copyOut(tc->getMemProxy());
733
734    return 0;
735}
736
737/// Target chmod() handler.
738template <class OS>
739SyscallReturn
740chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
741          ThreadContext *tc)
742{
743    std::string path;
744
745    int index = 0;
746    if (!tc->getMemProxy().tryReadString(path,
747                process->getSyscallArg(tc, index))) {
748        return -EFAULT;
749    }
750
751    uint32_t mode = process->getSyscallArg(tc, index);
752    mode_t hostMode = 0;
753
754    // XXX translate mode flags via OS::something???
755    hostMode = mode;
756
757    // Adjust path for current working directory
758    path = process->fullPath(path);
759
760    // do the chmod
761    int result = chmod(path.c_str(), hostMode);
762    if (result < 0)
763        return -errno;
764
765    return 0;
766}
767
768
769/// Target fchmod() handler.
770template <class OS>
771SyscallReturn
772fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
773           ThreadContext *tc)
774{
775    int index = 0;
776    int fd = process->getSyscallArg(tc, index);
777    if (fd < 0 || process->sim_fd(fd) < 0) {
778        // doesn't map to any simulator fd: not a valid target fd
779        return -EBADF;
780    }
781
782    uint32_t mode = process->getSyscallArg(tc, index);
783    mode_t hostMode = 0;
784
785    // XXX translate mode flags via OS::someting???
786    hostMode = mode;
787
788    // do the fchmod
789    int result = fchmod(process->sim_fd(fd), hostMode);
790    if (result < 0)
791        return -errno;
792
793    return 0;
794}
795
796/// Target mremap() handler.
797template <class OS>
798SyscallReturn
799mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
800{
801    int index = 0;
802    Addr start = process->getSyscallArg(tc, index);
803    uint64_t old_length = process->getSyscallArg(tc, index);
804    uint64_t new_length = process->getSyscallArg(tc, index);
805    uint64_t flags = process->getSyscallArg(tc, index);
806    uint64_t provided_address = 0;
807    bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
808
809    if (use_provided_address)
810        provided_address = process->getSyscallArg(tc, index);
811
812    if ((start % TheISA::PageBytes != 0) ||
813        (provided_address % TheISA::PageBytes != 0)) {
814        warn("mremap failing: arguments not page aligned");
815        return -EINVAL;
816    }
817
818    new_length = roundUp(new_length, TheISA::PageBytes);
819
820    if (new_length > old_length) {
821        if ((start + old_length) == process->mmap_end &&
822            (!use_provided_address || provided_address == start)) {
823            uint64_t diff = new_length - old_length;
824            process->allocateMem(process->mmap_end, diff);
825            process->mmap_end += diff;
826            return start;
827        } else {
828            if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
829                warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
830                return -ENOMEM;
831            } else {
832                uint64_t new_start = use_provided_address ?
833                    provided_address : process->mmap_end;
834                process->pTable->remap(start, old_length, new_start);
835                warn("mremapping to new vaddr %08p-%08p, adding %d\n",
836                     new_start, new_start + new_length,
837                     new_length - old_length);
838                // add on the remaining unallocated pages
839                process->allocateMem(new_start + old_length,
840                                     new_length - old_length,
841                                     use_provided_address /* clobber */);
842                if (!use_provided_address)
843                    process->mmap_end += new_length;
844                if (use_provided_address &&
845                    new_start + new_length > process->mmap_end) {
846                    // something fishy going on here, at least notify the user
847                    // @todo: increase mmap_end?
848                    warn("mmap region limit exceeded with MREMAP_FIXED\n");
849                }
850                warn("returning %08p as start\n", new_start);
851                return new_start;
852            }
853        }
854    } else {
855        if (use_provided_address && provided_address != start)
856            process->pTable->remap(start, new_length, provided_address);
857        process->pTable->unmap(start + new_length, old_length - new_length);
858        return use_provided_address ? provided_address : start;
859    }
860}
861
862/// Target stat() handler.
863template <class OS>
864SyscallReturn
865statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
866         ThreadContext *tc)
867{
868    std::string path;
869
870    int index = 0;
871    if (!tc->getMemProxy().tryReadString(path,
872                process->getSyscallArg(tc, index))) {
873        return -EFAULT;
874    }
875    Addr bufPtr = process->getSyscallArg(tc, index);
876
877    // Adjust path for current working directory
878    path = process->fullPath(path);
879
880    struct stat hostBuf;
881    int result = stat(path.c_str(), &hostBuf);
882
883    if (result < 0)
884        return -errno;
885
886    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
887
888    return 0;
889}
890
891
892/// Target stat64() handler.
893template <class OS>
894SyscallReturn
895stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
896           ThreadContext *tc)
897{
898    std::string path;
899
900    int index = 0;
901    if (!tc->getMemProxy().tryReadString(path,
902                process->getSyscallArg(tc, index)))
903        return -EFAULT;
904    Addr bufPtr = process->getSyscallArg(tc, index);
905
906    // Adjust path for current working directory
907    path = process->fullPath(path);
908
909#if NO_STAT64
910    struct stat  hostBuf;
911    int result = stat(path.c_str(), &hostBuf);
912#else
913    struct stat64 hostBuf;
914    int result = stat64(path.c_str(), &hostBuf);
915#endif
916
917    if (result < 0)
918        return -errno;
919
920    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
921
922    return 0;
923}
924
925
926/// Target fstatat64() handler.
927template <class OS>
928SyscallReturn
929fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
930              ThreadContext *tc)
931{
932    int index = 0;
933    int dirfd = process->getSyscallArg(tc, index);
934    if (dirfd != OS::TGT_AT_FDCWD)
935        warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
936
937    std::string path;
938    if (!tc->getMemProxy().tryReadString(path,
939                process->getSyscallArg(tc, index)))
940        return -EFAULT;
941    Addr bufPtr = process->getSyscallArg(tc, index);
942
943    // Adjust path for current working directory
944    path = process->fullPath(path);
945
946#if NO_STAT64
947    struct stat  hostBuf;
948    int result = stat(path.c_str(), &hostBuf);
949#else
950    struct stat64 hostBuf;
951    int result = stat64(path.c_str(), &hostBuf);
952#endif
953
954    if (result < 0)
955        return -errno;
956
957    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
958
959    return 0;
960}
961
962
963/// Target fstat64() handler.
964template <class OS>
965SyscallReturn
966fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
967            ThreadContext *tc)
968{
969    int index = 0;
970    int fd = process->getSyscallArg(tc, index);
971    Addr bufPtr = process->getSyscallArg(tc, index);
972    if (fd < 0 || process->sim_fd(fd) < 0) {
973        // doesn't map to any simulator fd: not a valid target fd
974        return -EBADF;
975    }
976
977#if NO_STAT64
978    struct stat  hostBuf;
979    int result = fstat(process->sim_fd(fd), &hostBuf);
980#else
981    struct stat64  hostBuf;
982    int result = fstat64(process->sim_fd(fd), &hostBuf);
983#endif
984
985    if (result < 0)
986        return -errno;
987
988    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
989
990    return 0;
991}
992
993
994/// Target lstat() handler.
995template <class OS>
996SyscallReturn
997lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
998          ThreadContext *tc)
999{
1000    std::string path;
1001
1002    int index = 0;
1003    if (!tc->getMemProxy().tryReadString(path,
1004                process->getSyscallArg(tc, index))) {
1005        return -EFAULT;
1006    }
1007    Addr bufPtr = process->getSyscallArg(tc, index);
1008
1009    // Adjust path for current working directory
1010    path = process->fullPath(path);
1011
1012    struct stat hostBuf;
1013    int result = lstat(path.c_str(), &hostBuf);
1014
1015    if (result < 0)
1016        return -errno;
1017
1018    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1019
1020    return 0;
1021}
1022
1023/// Target lstat64() handler.
1024template <class OS>
1025SyscallReturn
1026lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1027            ThreadContext *tc)
1028{
1029    std::string path;
1030
1031    int index = 0;
1032    if (!tc->getMemProxy().tryReadString(path,
1033                process->getSyscallArg(tc, index))) {
1034        return -EFAULT;
1035    }
1036    Addr bufPtr = process->getSyscallArg(tc, index);
1037
1038    // Adjust path for current working directory
1039    path = process->fullPath(path);
1040
1041#if NO_STAT64
1042    struct stat hostBuf;
1043    int result = lstat(path.c_str(), &hostBuf);
1044#else
1045    struct stat64 hostBuf;
1046    int result = lstat64(path.c_str(), &hostBuf);
1047#endif
1048
1049    if (result < 0)
1050        return -errno;
1051
1052    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1053
1054    return 0;
1055}
1056
1057/// Target fstat() handler.
1058template <class OS>
1059SyscallReturn
1060fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1061          ThreadContext *tc)
1062{
1063    int index = 0;
1064    int fd = process->sim_fd(process->getSyscallArg(tc, index));
1065    Addr bufPtr = process->getSyscallArg(tc, index);
1066
1067    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
1068
1069    if (fd < 0)
1070        return -EBADF;
1071
1072    struct stat hostBuf;
1073    int result = fstat(fd, &hostBuf);
1074
1075    if (result < 0)
1076        return -errno;
1077
1078    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1079
1080    return 0;
1081}
1082
1083
1084/// Target statfs() handler.
1085template <class OS>
1086SyscallReturn
1087statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1088           ThreadContext *tc)
1089{
1090    std::string path;
1091
1092    int index = 0;
1093    if (!tc->getMemProxy().tryReadString(path,
1094                process->getSyscallArg(tc, index))) {
1095        return -EFAULT;
1096    }
1097    Addr bufPtr = process->getSyscallArg(tc, index);
1098
1099    // Adjust path for current working directory
1100    path = process->fullPath(path);
1101
1102    struct statfs hostBuf;
1103    int result = statfs(path.c_str(), &hostBuf);
1104
1105    if (result < 0)
1106        return -errno;
1107
1108    OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1109
1110    return 0;
1111}
1112
1113
1114/// Target fstatfs() handler.
1115template <class OS>
1116SyscallReturn
1117fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1118            ThreadContext *tc)
1119{
1120    int index = 0;
1121    int fd = process->sim_fd(process->getSyscallArg(tc, index));
1122    Addr bufPtr = process->getSyscallArg(tc, index);
1123
1124    if (fd < 0)
1125        return -EBADF;
1126
1127    struct statfs hostBuf;
1128    int result = fstatfs(fd, &hostBuf);
1129
1130    if (result < 0)
1131        return -errno;
1132
1133    OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1134
1135    return 0;
1136}
1137
1138
1139/// Target writev() handler.
1140template <class OS>
1141SyscallReturn
1142writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1143           ThreadContext *tc)
1144{
1145    int index = 0;
1146    int fd = process->getSyscallArg(tc, index);
1147    if (fd < 0 || process->sim_fd(fd) < 0) {
1148        // doesn't map to any simulator fd: not a valid target fd
1149        return -EBADF;
1150    }
1151
1152    SETranslatingPortProxy &p = tc->getMemProxy();
1153    uint64_t tiov_base = process->getSyscallArg(tc, index);
1154    size_t count = process->getSyscallArg(tc, index);
1155    struct iovec hiov[count];
1156    for (size_t i = 0; i < count; ++i) {
1157        typename OS::tgt_iovec tiov;
1158
1159        p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1160                   (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1161        hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1162        hiov[i].iov_base = new char [hiov[i].iov_len];
1163        p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1164                   hiov[i].iov_len);
1165    }
1166
1167    int result = writev(process->sim_fd(fd), hiov, count);
1168
1169    for (size_t i = 0; i < count; ++i)
1170        delete [] (char *)hiov[i].iov_base;
1171
1172    if (result < 0)
1173        return -errno;
1174
1175    return result;
1176}
1177
1178
1179/// Target mmap() handler.
1180///
1181/// We don't really handle mmap().  If the target is mmaping an
1182/// anonymous region or /dev/zero, we can get away with doing basically
1183/// nothing (since memory is initialized to zero and the simulator
1184/// doesn't really check addresses anyway).
1185///
1186template <class OS>
1187SyscallReturn
1188mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1189{
1190    int index = 0;
1191    Addr start = p->getSyscallArg(tc, index);
1192    uint64_t length = p->getSyscallArg(tc, index);
1193    index++; // int prot = p->getSyscallArg(tc, index);
1194    int flags = p->getSyscallArg(tc, index);
1195    int tgt_fd = p->getSyscallArg(tc, index);
1196    int offset = p->getSyscallArg(tc, index);
1197
1198    if (length > 0x100000000ULL)
1199        warn("mmap length argument %#x is unreasonably large.\n", length);
1200
1201    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1202        Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1203        if (!fd_map || fd_map->fd < 0) {
1204            warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1205            return -EBADF;
1206        }
1207
1208        if (fd_map->filename != "/dev/zero") {
1209            // This is very likely broken, but leave a warning here
1210            // (rather than panic) in case /dev/zero is known by
1211            // another name on some platform
1212            warn("allowing mmap of file %s; mmap not supported on files"
1213                 " other than /dev/zero\n", fd_map->filename);
1214        }
1215    }
1216
1217    length = roundUp(length, TheISA::PageBytes);
1218
1219    if ((start  % TheISA::PageBytes) != 0 ||
1220        (offset % TheISA::PageBytes) != 0) {
1221        warn("mmap failing: arguments not page-aligned: "
1222             "start 0x%x offset 0x%x",
1223             start, offset);
1224        return -EINVAL;
1225    }
1226
1227    // are we ok with clobbering existing mappings?  only set this to
1228    // true if the user has been warned.
1229    bool clobber = false;
1230
1231    // try to use the caller-provided address if there is one
1232    bool use_provided_address = (start != 0);
1233
1234    if (use_provided_address) {
1235        // check to see if the desired address is already in use
1236        if (!p->pTable->isUnmapped(start, length)) {
1237            // there are existing mappings in the desired range
1238            // whether we clobber them or not depends on whether the caller
1239            // specified MAP_FIXED
1240            if (flags & OS::TGT_MAP_FIXED) {
1241                // MAP_FIXED specified: map attempt fails
1242                return -EINVAL;
1243            } else {
1244                // MAP_FIXED not specified: ignore suggested start address
1245                warn("mmap: ignoring suggested map address 0x%x\n", start);
1246                use_provided_address = false;
1247            }
1248        }
1249    }
1250
1251    if (!use_provided_address) {
1252        // no address provided, or provided address unusable:
1253        // pick next address from our "mmap region"
1254        if (OS::mmapGrowsDown()) {
1255            start = p->mmap_end - length;
1256            p->mmap_end = start;
1257        } else {
1258            start = p->mmap_end;
1259            p->mmap_end += length;
1260        }
1261    }
1262
1263    p->allocateMem(start, length, clobber);
1264
1265    return start;
1266}
1267
1268/// Target getrlimit() handler.
1269template <class OS>
1270SyscallReturn
1271getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1272        ThreadContext *tc)
1273{
1274    int index = 0;
1275    unsigned resource = process->getSyscallArg(tc, index);
1276    TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1277
1278    switch (resource) {
1279        case OS::TGT_RLIMIT_STACK:
1280            // max stack size in bytes: make up a number (8MB for now)
1281            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1282            rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1283            rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1284            break;
1285
1286        case OS::TGT_RLIMIT_DATA:
1287            // max data segment size in bytes: make up a number
1288            rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1289            rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1290            rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1291            break;
1292
1293        default:
1294            warn("getrlimit: unimplemented resource %d", resource);
1295            return -EINVAL;
1296            break;
1297    }
1298
1299    rlp.copyOut(tc->getMemProxy());
1300    return 0;
1301}
1302
1303/// Target clock_gettime() function.
1304template <class OS>
1305SyscallReturn
1306clock_gettimeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1307{
1308    int index = 1;
1309    //int clk_id = p->getSyscallArg(tc, index);
1310    TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1311
1312    getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1313    tp->tv_sec += seconds_since_epoch;
1314    tp->tv_sec = TheISA::htog(tp->tv_sec);
1315    tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1316
1317    tp.copyOut(tc->getMemProxy());
1318
1319    return 0;
1320}
1321
1322/// Target gettimeofday() handler.
1323template <class OS>
1324SyscallReturn
1325gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1326        ThreadContext *tc)
1327{
1328    int index = 0;
1329    TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1330
1331    getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1332    tp->tv_sec += seconds_since_epoch;
1333    tp->tv_sec = TheISA::htog(tp->tv_sec);
1334    tp->tv_usec = TheISA::htog(tp->tv_usec);
1335
1336    tp.copyOut(tc->getMemProxy());
1337
1338    return 0;
1339}
1340
1341
1342/// Target utimes() handler.
1343template <class OS>
1344SyscallReturn
1345utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1346           ThreadContext *tc)
1347{
1348    std::string path;
1349
1350    int index = 0;
1351    if (!tc->getMemProxy().tryReadString(path,
1352                process->getSyscallArg(tc, index))) {
1353        return -EFAULT;
1354    }
1355
1356    TypedBufferArg<typename OS::timeval [2]>
1357        tp(process->getSyscallArg(tc, index));
1358    tp.copyIn(tc->getMemProxy());
1359
1360    struct timeval hostTimeval[2];
1361    for (int i = 0; i < 2; ++i)
1362    {
1363        hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1364        hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1365    }
1366
1367    // Adjust path for current working directory
1368    path = process->fullPath(path);
1369
1370    int result = utimes(path.c_str(), hostTimeval);
1371
1372    if (result < 0)
1373        return -errno;
1374
1375    return 0;
1376}
1377/// Target getrusage() function.
1378template <class OS>
1379SyscallReturn
1380getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1381              ThreadContext *tc)
1382{
1383    int index = 0;
1384    int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1385    TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1386
1387    rup->ru_utime.tv_sec = 0;
1388    rup->ru_utime.tv_usec = 0;
1389    rup->ru_stime.tv_sec = 0;
1390    rup->ru_stime.tv_usec = 0;
1391    rup->ru_maxrss = 0;
1392    rup->ru_ixrss = 0;
1393    rup->ru_idrss = 0;
1394    rup->ru_isrss = 0;
1395    rup->ru_minflt = 0;
1396    rup->ru_majflt = 0;
1397    rup->ru_nswap = 0;
1398    rup->ru_inblock = 0;
1399    rup->ru_oublock = 0;
1400    rup->ru_msgsnd = 0;
1401    rup->ru_msgrcv = 0;
1402    rup->ru_nsignals = 0;
1403    rup->ru_nvcsw = 0;
1404    rup->ru_nivcsw = 0;
1405
1406    switch (who) {
1407      case OS::TGT_RUSAGE_SELF:
1408        getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1409        rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1410        rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1411        break;
1412
1413      case OS::TGT_RUSAGE_CHILDREN:
1414        // do nothing.  We have no child processes, so they take no time.
1415        break;
1416
1417      default:
1418        // don't really handle THREAD or CHILDREN, but just warn and
1419        // plow ahead
1420        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1421             who);
1422    }
1423
1424    rup.copyOut(tc->getMemProxy());
1425
1426    return 0;
1427}
1428
1429/// Target times() function.
1430template <class OS>
1431SyscallReturn
1432timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1433           ThreadContext *tc)
1434{
1435    int index = 0;
1436    TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1437
1438    // Fill in the time structure (in clocks)
1439    int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1440    bufp->tms_utime = clocks;
1441    bufp->tms_stime = 0;
1442    bufp->tms_cutime = 0;
1443    bufp->tms_cstime = 0;
1444
1445    // Convert to host endianness
1446    bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1447
1448    // Write back
1449    bufp.copyOut(tc->getMemProxy());
1450
1451    // Return clock ticks since system boot
1452    return clocks;
1453}
1454
1455/// Target time() function.
1456template <class OS>
1457SyscallReturn
1458timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1459           ThreadContext *tc)
1460{
1461    typename OS::time_t sec, usec;
1462    getElapsedTimeMicro(sec, usec);
1463    sec += seconds_since_epoch;
1464
1465    int index = 0;
1466    Addr taddr = (Addr)process->getSyscallArg(tc, index);
1467    if(taddr != 0) {
1468        typename OS::time_t t = sec;
1469        t = TheISA::htog(t);
1470        SETranslatingPortProxy &p = tc->getMemProxy();
1471        p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1472    }
1473    return sec;
1474}
1475
1476
1477#endif // __SIM_SYSCALL_EMUL_HH__
1478