syscall_emul.hh revision 10796:5bcba8001c7e 
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
101    /// Flag values for controlling syscall behavior.
102    enum Flags {
103        /// Don't set return regs according to funcPtr return value.
104        /// Used for syscalls with non-standard return conventions
105        /// that explicitly set the ThreadContext regs (e.g.,
106        /// sigreturn).
107        SuppressReturnValue = 1
108    };
109
110    /// Constructor.
111    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
112        : name(_name), funcPtr(_funcPtr), flags(_flags)
113    {
114    }
115
116    /// Emulate the syscall.  Public interface for calling through funcPtr.
117    void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
118};
119
120
121//////////////////////////////////////////////////////////////////////
122//
123// The following emulation functions are generic enough that they
124// don't need to be recompiled for different emulated OS's.  They are
125// defined in sim/syscall_emul.cc.
126//
127//////////////////////////////////////////////////////////////////////
128
129
130/// Handler for unimplemented syscalls that we haven't thought about.
131SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
132                                LiveProcess *p, ThreadContext *tc);
133
134/// Handler for unimplemented syscalls that we never intend to
135/// implement (signal handling, etc.) and should not affect the correct
136/// behavior of the program.  Print a warning only if the appropriate
137/// trace flag is enabled.  Return success to the target program.
138SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
139                         LiveProcess *p, ThreadContext *tc);
140SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
141                         LiveProcess *p, ThreadContext *tc);
142
143/// Target exit() handler: terminate current context.
144SyscallReturn exitFunc(SyscallDesc *desc, int num,
145                       LiveProcess *p, ThreadContext *tc);
146
147/// Target exit_group() handler: terminate simulation. (exit all threads)
148SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
149                       LiveProcess *p, ThreadContext *tc);
150
151/// Target getpagesize() handler.
152SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
153                              LiveProcess *p, ThreadContext *tc);
154
155/// Target brk() handler: set brk address.
156SyscallReturn brkFunc(SyscallDesc *desc, int num,
157                      LiveProcess *p, ThreadContext *tc);
158
159/// Target close() handler.
160SyscallReturn closeFunc(SyscallDesc *desc, int num,
161                        LiveProcess *p, ThreadContext *tc);
162
163/// Target read() handler.
164SyscallReturn readFunc(SyscallDesc *desc, int num,
165                       LiveProcess *p, ThreadContext *tc);
166
167/// Target write() handler.
168SyscallReturn writeFunc(SyscallDesc *desc, int num,
169                        LiveProcess *p, ThreadContext *tc);
170
171/// Target lseek() handler.
172SyscallReturn lseekFunc(SyscallDesc *desc, int num,
173                        LiveProcess *p, ThreadContext *tc);
174
175/// Target _llseek() handler.
176SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
177                        LiveProcess *p, ThreadContext *tc);
178
179/// Target munmap() handler.
180SyscallReturn munmapFunc(SyscallDesc *desc, int num,
181                         LiveProcess *p, ThreadContext *tc);
182
183/// Target gethostname() handler.
184SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
185                              LiveProcess *p, ThreadContext *tc);
186
187/// Target getcwd() handler.
188SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
189                         LiveProcess *p, ThreadContext *tc);
190
191/// Target readlink() handler.
192SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
193                           LiveProcess *p, ThreadContext *tc,
194                           int index = 0);
195SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
196                           LiveProcess *p, ThreadContext *tc);
197
198/// Target unlink() handler.
199SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
200                           LiveProcess *p, ThreadContext *tc,
201                           int index);
202SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
203                         LiveProcess *p, ThreadContext *tc);
204
205/// Target mkdir() handler.
206SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
207                        LiveProcess *p, ThreadContext *tc);
208
209/// Target rename() handler.
210SyscallReturn renameFunc(SyscallDesc *desc, int num,
211                         LiveProcess *p, ThreadContext *tc);
212
213
214/// Target truncate() handler.
215SyscallReturn truncateFunc(SyscallDesc *desc, int num,
216                           LiveProcess *p, ThreadContext *tc);
217
218
219/// Target ftruncate() handler.
220SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
221                            LiveProcess *p, ThreadContext *tc);
222
223
224/// Target truncate64() handler.
225SyscallReturn truncate64Func(SyscallDesc *desc, int num,
226                             LiveProcess *p, ThreadContext *tc);
227
228/// Target ftruncate64() handler.
229SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
230                              LiveProcess *p, ThreadContext *tc);
231
232
233/// Target umask() handler.
234SyscallReturn umaskFunc(SyscallDesc *desc, int num,
235                        LiveProcess *p, ThreadContext *tc);
236
237
238/// Target chown() handler.
239SyscallReturn chownFunc(SyscallDesc *desc, int num,
240                        LiveProcess *p, ThreadContext *tc);
241
242
243/// Target fchown() handler.
244SyscallReturn fchownFunc(SyscallDesc *desc, int num,
245                         LiveProcess *p, ThreadContext *tc);
246
247/// Target dup() handler.
248SyscallReturn dupFunc(SyscallDesc *desc, int num,
249                      LiveProcess *process, ThreadContext *tc);
250
251/// Target fnctl() handler.
252SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
253                        LiveProcess *process, ThreadContext *tc);
254
255/// Target fcntl64() handler.
256SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
257                        LiveProcess *process, ThreadContext *tc);
258
259/// Target setuid() handler.
260SyscallReturn setuidFunc(SyscallDesc *desc, int num,
261                               LiveProcess *p, ThreadContext *tc);
262
263/// Target getpid() handler.
264SyscallReturn getpidFunc(SyscallDesc *desc, int num,
265                               LiveProcess *p, ThreadContext *tc);
266
267/// Target getuid() handler.
268SyscallReturn getuidFunc(SyscallDesc *desc, int num,
269                               LiveProcess *p, ThreadContext *tc);
270
271/// Target getgid() handler.
272SyscallReturn getgidFunc(SyscallDesc *desc, int num,
273                               LiveProcess *p, ThreadContext *tc);
274
275/// Target getppid() handler.
276SyscallReturn getppidFunc(SyscallDesc *desc, int num,
277                               LiveProcess *p, ThreadContext *tc);
278
279/// Target geteuid() handler.
280SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
281                               LiveProcess *p, ThreadContext *tc);
282
283/// Target getegid() handler.
284SyscallReturn getegidFunc(SyscallDesc *desc, int num,
285                               LiveProcess *p, ThreadContext *tc);
286
287/// Target clone() handler.
288SyscallReturn cloneFunc(SyscallDesc *desc, int num,
289                               LiveProcess *p, ThreadContext *tc);
290
291/// Target access() handler
292SyscallReturn accessFunc(SyscallDesc *desc, int num,
293                               LiveProcess *p, ThreadContext *tc);
294SyscallReturn accessFunc(SyscallDesc *desc, int num,
295                               LiveProcess *p, ThreadContext *tc,
296                               int index);
297
298/// Futex system call
299///  Implemented by Daniel Sanchez
300///  Used by printf's in multi-threaded apps
301template <class OS>
302SyscallReturn
303futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
304          ThreadContext *tc)
305{
306    int index_uaddr = 0;
307    int index_op = 1;
308    int index_val = 2;
309    int index_timeout = 3;
310
311    uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
312    int op = process->getSyscallArg(tc, index_op);
313    int val = process->getSyscallArg(tc, index_val);
314    uint64_t timeout = process->getSyscallArg(tc, index_timeout);
315
316    std::map<uint64_t, std::list<ThreadContext *> * >
317        &futex_map = tc->getSystemPtr()->futexMap;
318
319    DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
320            uaddr, op, val);
321
322    op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
323
324    if (op == OS::TGT_FUTEX_WAIT) {
325        if (timeout != 0) {
326            warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
327                 "we'll wait indefinitely");
328        }
329
330        uint8_t *buf = new uint8_t[sizeof(int)];
331        tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
332        int mem_val = *((int *)buf);
333        delete buf;
334
335        if(val != mem_val) {
336            DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
337                                    "expected: %d\n", mem_val, val);
338            return -OS::TGT_EWOULDBLOCK;
339        }
340
341        // Queue the thread context
342        std::list<ThreadContext *> * tcWaitList;
343        if (futex_map.count(uaddr)) {
344            tcWaitList = futex_map.find(uaddr)->second;
345        } else {
346            tcWaitList = new std::list<ThreadContext *>();
347            futex_map.insert(std::pair< uint64_t,
348                            std::list<ThreadContext *> * >(uaddr, tcWaitList));
349        }
350        tcWaitList->push_back(tc);
351        DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
352                                "thread context\n");
353        tc->suspend();
354        return 0;
355    } else if (op == OS::TGT_FUTEX_WAKE){
356        int wokenUp = 0;
357        std::list<ThreadContext *> * tcWaitList;
358        if (futex_map.count(uaddr)) {
359            tcWaitList = futex_map.find(uaddr)->second;
360            while (tcWaitList->size() > 0 && wokenUp < val) {
361                tcWaitList->front()->activate();
362                tcWaitList->pop_front();
363                wokenUp++;
364            }
365            if(tcWaitList->empty()) {
366                futex_map.erase(uaddr);
367                delete tcWaitList;
368            }
369        }
370        DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
371                                "thread contexts\n", wokenUp);
372        return wokenUp;
373    } else {
374        warn("sys_futex: op %d is not implemented, just returning...", op);
375        return 0;
376    }
377
378}
379
380
381/// Pseudo Funcs  - These functions use a different return convension,
382/// returning a second value in a register other than the normal return register
383SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
384                             LiveProcess *process, ThreadContext *tc);
385
386/// Target getpidPseudo() handler.
387SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
388                               LiveProcess *p, ThreadContext *tc);
389
390/// Target getuidPseudo() handler.
391SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
392                               LiveProcess *p, ThreadContext *tc);
393
394/// Target getgidPseudo() handler.
395SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
396                               LiveProcess *p, ThreadContext *tc);
397
398
399/// A readable name for 1,000,000, for converting microseconds to seconds.
400const int one_million = 1000000;
401/// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
402const int one_billion = 1000000000;
403
404/// Approximate seconds since the epoch (1/1/1970).  About a billion,
405/// by my reckoning.  We want to keep this a constant (not use the
406/// real-world time) to keep simulations repeatable.
407const unsigned seconds_since_epoch = 1000000000;
408
409/// Helper function to convert current elapsed time to seconds and
410/// microseconds.
411template <class T1, class T2>
412void
413getElapsedTimeMicro(T1 &sec, T2 &usec)
414{
415    uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
416    sec = elapsed_usecs / one_million;
417    usec = elapsed_usecs % one_million;
418}
419
420/// Helper function to convert current elapsed time to seconds and
421/// nanoseconds.
422template <class T1, class T2>
423void
424getElapsedTimeNano(T1 &sec, T2 &nsec)
425{
426    uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
427    sec = elapsed_nsecs / one_billion;
428    nsec = elapsed_nsecs % one_billion;
429}
430
431//////////////////////////////////////////////////////////////////////
432//
433// The following emulation functions are generic, but need to be
434// templated to account for differences in types, constants, etc.
435//
436//////////////////////////////////////////////////////////////////////
437
438#if NO_STAT64
439    typedef struct stat hst_stat;
440    typedef struct stat hst_stat64;
441#else
442    typedef struct stat hst_stat;
443    typedef struct stat64 hst_stat64;
444#endif
445
446//// Helper function to convert a host stat buffer to a target stat
447//// buffer.  Also copies the target buffer out to the simulated
448//// memory space.  Used by stat(), fstat(), and lstat().
449
450template <typename target_stat, typename host_stat>
451static void
452convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
453{
454    using namespace TheISA;
455
456    if (fakeTTY)
457        tgt->st_dev = 0xA;
458    else
459        tgt->st_dev = host->st_dev;
460    tgt->st_dev = TheISA::htog(tgt->st_dev);
461    tgt->st_ino = host->st_ino;
462    tgt->st_ino = TheISA::htog(tgt->st_ino);
463    tgt->st_mode = host->st_mode;
464    if (fakeTTY) {
465        // Claim to be a character device
466        tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
467        tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
468    }
469    tgt->st_mode = TheISA::htog(tgt->st_mode);
470    tgt->st_nlink = host->st_nlink;
471    tgt->st_nlink = TheISA::htog(tgt->st_nlink);
472    tgt->st_uid = host->st_uid;
473    tgt->st_uid = TheISA::htog(tgt->st_uid);
474    tgt->st_gid = host->st_gid;
475    tgt->st_gid = TheISA::htog(tgt->st_gid);
476    if (fakeTTY)
477        tgt->st_rdev = 0x880d;
478    else
479        tgt->st_rdev = host->st_rdev;
480    tgt->st_rdev = TheISA::htog(tgt->st_rdev);
481    tgt->st_size = host->st_size;
482    tgt->st_size = TheISA::htog(tgt->st_size);
483    tgt->st_atimeX = host->st_atime;
484    tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
485    tgt->st_mtimeX = host->st_mtime;
486    tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
487    tgt->st_ctimeX = host->st_ctime;
488    tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
489    // Force the block size to be 8k. This helps to ensure buffered io works
490    // consistently across different hosts.
491    tgt->st_blksize = 0x2000;
492    tgt->st_blksize = TheISA::htog(tgt->st_blksize);
493    tgt->st_blocks = host->st_blocks;
494    tgt->st_blocks = TheISA::htog(tgt->st_blocks);
495}
496
497// Same for stat64
498
499template <typename target_stat, typename host_stat64>
500static void
501convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
502{
503    using namespace TheISA;
504
505    convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
506#if defined(STAT_HAVE_NSEC)
507    tgt->st_atime_nsec = host->st_atime_nsec;
508    tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
509    tgt->st_mtime_nsec = host->st_mtime_nsec;
510    tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
511    tgt->st_ctime_nsec = host->st_ctime_nsec;
512    tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
513#else
514    tgt->st_atime_nsec = 0;
515    tgt->st_mtime_nsec = 0;
516    tgt->st_ctime_nsec = 0;
517#endif
518}
519
520//Here are a couple convenience functions
521template<class OS>
522static void
523copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
524        hst_stat *host, bool fakeTTY = false)
525{
526    typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
527    tgt_stat_buf tgt(addr);
528    convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
529    tgt.copyOut(mem);
530}
531
532template<class OS>
533static void
534copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
535        hst_stat64 *host, bool fakeTTY = false)
536{
537    typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
538    tgt_stat_buf tgt(addr);
539    convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
540    tgt.copyOut(mem);
541}
542
543/// Target ioctl() handler.  For the most part, programs call ioctl()
544/// only to find out if their stdout is a tty, to determine whether to
545/// do line or block buffering.  We always claim that output fds are
546/// not TTYs to provide repeatable results.
547template <class OS>
548SyscallReturn
549ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
550          ThreadContext *tc)
551{
552    int index = 0;
553    int fd = process->getSyscallArg(tc, index);
554    unsigned req = process->getSyscallArg(tc, index);
555
556    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
557
558    Process::FdMap *fdObj = process->sim_fd_obj(fd);
559
560    if (fdObj == NULL) {
561        // doesn't map to any simulator fd: not a valid target fd
562        return -EBADF;
563    }
564
565    if (fdObj->driver != NULL) {
566        return fdObj->driver->ioctl(process, tc, req);
567    }
568
569    if (OS::isTtyReq(req)) {
570        return -ENOTTY;
571    }
572
573    warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
574         fd, req, tc->pcState());
575    return -ENOTTY;
576}
577
578template <class OS>
579static SyscallReturn
580openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
581         ThreadContext *tc, int index)
582{
583    std::string path;
584
585    if (!tc->getMemProxy().tryReadString(path,
586                process->getSyscallArg(tc, index)))
587        return -EFAULT;
588
589    int tgtFlags = process->getSyscallArg(tc, index);
590    int mode = process->getSyscallArg(tc, index);
591    int hostFlags = 0;
592
593    // translate open flags
594    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
595        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
596            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
597            hostFlags |= OS::openFlagTable[i].hostFlag;
598        }
599    }
600
601    // any target flags left?
602    if (tgtFlags != 0)
603        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
604
605#ifdef __CYGWIN32__
606    hostFlags |= O_BINARY;
607#endif
608
609    // Adjust path for current working directory
610    path = process->fullPath(path);
611
612    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
613
614    if (startswith(path, "/dev/")) {
615        std::string filename = path.substr(strlen("/dev/"));
616        if (filename == "sysdev0") {
617            // This is a memory-mapped high-resolution timer device on Alpha.
618            // We don't support it, so just punt.
619            warn("Ignoring open(%s, ...)\n", path);
620            return -ENOENT;
621        }
622
623        EmulatedDriver *drv = process->findDriver(filename);
624        if (drv != NULL) {
625            // the driver's open method will allocate a fd from the
626            // process if necessary.
627            return drv->open(process, tc, mode, hostFlags);
628        }
629
630        // fall through here for pass through to host devices, such as
631        // /dev/zero
632    }
633
634    int fd;
635    int local_errno;
636    if (startswith(path, "/proc/") || startswith(path, "/system/") ||
637        startswith(path, "/platform/") || startswith(path, "/sys/")) {
638        // It's a proc/sys entry and requires special handling
639        fd = OS::openSpecialFile(path, process, tc);
640        local_errno = ENOENT;
641     } else {
642        // open the file
643        fd = open(path.c_str(), hostFlags, mode);
644        local_errno = errno;
645     }
646
647    if (fd == -1)
648        return -local_errno;
649
650    return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
651}
652
653/// Target open() handler.
654template <class OS>
655SyscallReturn
656openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
657         ThreadContext *tc)
658{
659    return openFunc<OS>(desc, callnum, process, tc, 0);
660}
661
662/// Target openat() handler.
663template <class OS>
664SyscallReturn
665openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
666         ThreadContext *tc)
667{
668    int index = 0;
669    int dirfd = process->getSyscallArg(tc, index);
670    if (dirfd != OS::TGT_AT_FDCWD)
671        warn("openat: first argument not AT_FDCWD; unlikely to work");
672    return openFunc<OS>(desc, callnum, process, tc, 1);
673}
674
675/// Target unlinkat() handler.
676template <class OS>
677SyscallReturn
678unlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
679             ThreadContext *tc)
680{
681    int index = 0;
682    int dirfd = process->getSyscallArg(tc, index);
683    if (dirfd != OS::TGT_AT_FDCWD)
684        warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
685
686    return unlinkHelper(desc, callnum, process, tc, 1);
687}
688
689/// Target facessat() handler
690template <class OS>
691SyscallReturn
692faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
693        ThreadContext *tc)
694{
695    int index = 0;
696    int dirfd = process->getSyscallArg(tc, index);
697    if (dirfd != OS::TGT_AT_FDCWD)
698        warn("faccessat: first argument not AT_FDCWD; unlikely to work");
699    return accessFunc(desc, callnum, process, tc, 1);
700}
701
702/// Target readlinkat() handler
703template <class OS>
704SyscallReturn
705readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
706        ThreadContext *tc)
707{
708    int index = 0;
709    int dirfd = process->getSyscallArg(tc, index);
710    if (dirfd != OS::TGT_AT_FDCWD)
711        warn("openat: first argument not AT_FDCWD; unlikely to work");
712    return readlinkFunc(desc, callnum, process, tc, 1);
713}
714
715/// Target sysinfo() handler.
716template <class OS>
717SyscallReturn
718sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
719         ThreadContext *tc)
720{
721
722    int index = 0;
723    TypedBufferArg<typename OS::tgt_sysinfo>
724        sysinfo(process->getSyscallArg(tc, index));
725
726    sysinfo->uptime=seconds_since_epoch;
727    sysinfo->totalram=process->system->memSize();
728
729    sysinfo.copyOut(tc->getMemProxy());
730
731    return 0;
732}
733
734/// Target chmod() handler.
735template <class OS>
736SyscallReturn
737chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
738          ThreadContext *tc)
739{
740    std::string path;
741
742    int index = 0;
743    if (!tc->getMemProxy().tryReadString(path,
744                process->getSyscallArg(tc, index))) {
745        return -EFAULT;
746    }
747
748    uint32_t mode = process->getSyscallArg(tc, index);
749    mode_t hostMode = 0;
750
751    // XXX translate mode flags via OS::something???
752    hostMode = mode;
753
754    // Adjust path for current working directory
755    path = process->fullPath(path);
756
757    // do the chmod
758    int result = chmod(path.c_str(), hostMode);
759    if (result < 0)
760        return -errno;
761
762    return 0;
763}
764
765
766/// Target fchmod() handler.
767template <class OS>
768SyscallReturn
769fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
770           ThreadContext *tc)
771{
772    int index = 0;
773    int fd = process->getSyscallArg(tc, index);
774    if (fd < 0 || process->sim_fd(fd) < 0) {
775        // doesn't map to any simulator fd: not a valid target fd
776        return -EBADF;
777    }
778
779    uint32_t mode = process->getSyscallArg(tc, index);
780    mode_t hostMode = 0;
781
782    // XXX translate mode flags via OS::someting???
783    hostMode = mode;
784
785    // do the fchmod
786    int result = fchmod(process->sim_fd(fd), hostMode);
787    if (result < 0)
788        return -errno;
789
790    return 0;
791}
792
793/// Target mremap() handler.
794template <class OS>
795SyscallReturn
796mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
797{
798    int index = 0;
799    Addr start = process->getSyscallArg(tc, index);
800    uint64_t old_length = process->getSyscallArg(tc, index);
801    uint64_t new_length = process->getSyscallArg(tc, index);
802    uint64_t flags = process->getSyscallArg(tc, index);
803    uint64_t provided_address = 0;
804    bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
805
806    if (use_provided_address)
807        provided_address = process->getSyscallArg(tc, index);
808
809    if ((start % TheISA::PageBytes != 0) ||
810        (provided_address % TheISA::PageBytes != 0)) {
811        warn("mremap failing: arguments not page aligned");
812        return -EINVAL;
813    }
814
815    new_length = roundUp(new_length, TheISA::PageBytes);
816
817    if (new_length > old_length) {
818        if ((start + old_length) == process->mmap_end &&
819            (!use_provided_address || provided_address == start)) {
820            uint64_t diff = new_length - old_length;
821            process->allocateMem(process->mmap_end, diff);
822            process->mmap_end += diff;
823            return start;
824        } else {
825            if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
826                warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
827                return -ENOMEM;
828            } else {
829                uint64_t new_start = use_provided_address ?
830                    provided_address : process->mmap_end;
831                process->pTable->remap(start, old_length, new_start);
832                warn("mremapping to new vaddr %08p-%08p, adding %d\n",
833                     new_start, new_start + new_length,
834                     new_length - old_length);
835                // add on the remaining unallocated pages
836                process->allocateMem(new_start + old_length,
837                                     new_length - old_length,
838                                     use_provided_address /* clobber */);
839                if (!use_provided_address)
840                    process->mmap_end += new_length;
841                if (use_provided_address &&
842                    new_start + new_length > process->mmap_end) {
843                    // something fishy going on here, at least notify the user
844                    // @todo: increase mmap_end?
845                    warn("mmap region limit exceeded with MREMAP_FIXED\n");
846                }
847                warn("returning %08p as start\n", new_start);
848                return new_start;
849            }
850        }
851    } else {
852        if (use_provided_address && provided_address != start)
853            process->pTable->remap(start, new_length, provided_address);
854        process->pTable->unmap(start + new_length, old_length - new_length);
855        return use_provided_address ? provided_address : start;
856    }
857}
858
859/// Target stat() handler.
860template <class OS>
861SyscallReturn
862statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
863         ThreadContext *tc)
864{
865    std::string path;
866
867    int index = 0;
868    if (!tc->getMemProxy().tryReadString(path,
869                process->getSyscallArg(tc, index))) {
870        return -EFAULT;
871    }
872    Addr bufPtr = process->getSyscallArg(tc, index);
873
874    // Adjust path for current working directory
875    path = process->fullPath(path);
876
877    struct stat hostBuf;
878    int result = stat(path.c_str(), &hostBuf);
879
880    if (result < 0)
881        return -errno;
882
883    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
884
885    return 0;
886}
887
888
889/// Target stat64() handler.
890template <class OS>
891SyscallReturn
892stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
893           ThreadContext *tc)
894{
895    std::string path;
896
897    int index = 0;
898    if (!tc->getMemProxy().tryReadString(path,
899                process->getSyscallArg(tc, index)))
900        return -EFAULT;
901    Addr bufPtr = process->getSyscallArg(tc, index);
902
903    // Adjust path for current working directory
904    path = process->fullPath(path);
905
906#if NO_STAT64
907    struct stat  hostBuf;
908    int result = stat(path.c_str(), &hostBuf);
909#else
910    struct stat64 hostBuf;
911    int result = stat64(path.c_str(), &hostBuf);
912#endif
913
914    if (result < 0)
915        return -errno;
916
917    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
918
919    return 0;
920}
921
922
923/// Target fstatat64() handler.
924template <class OS>
925SyscallReturn
926fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
927              ThreadContext *tc)
928{
929    int index = 0;
930    int dirfd = process->getSyscallArg(tc, index);
931    if (dirfd != OS::TGT_AT_FDCWD)
932        warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
933
934    std::string path;
935    if (!tc->getMemProxy().tryReadString(path,
936                process->getSyscallArg(tc, index)))
937        return -EFAULT;
938    Addr bufPtr = process->getSyscallArg(tc, index);
939
940    // Adjust path for current working directory
941    path = process->fullPath(path);
942
943#if NO_STAT64
944    struct stat  hostBuf;
945    int result = stat(path.c_str(), &hostBuf);
946#else
947    struct stat64 hostBuf;
948    int result = stat64(path.c_str(), &hostBuf);
949#endif
950
951    if (result < 0)
952        return -errno;
953
954    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
955
956    return 0;
957}
958
959
960/// Target fstat64() handler.
961template <class OS>
962SyscallReturn
963fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
964            ThreadContext *tc)
965{
966    int index = 0;
967    int fd = process->getSyscallArg(tc, index);
968    Addr bufPtr = process->getSyscallArg(tc, index);
969    if (fd < 0 || process->sim_fd(fd) < 0) {
970        // doesn't map to any simulator fd: not a valid target fd
971        return -EBADF;
972    }
973
974#if NO_STAT64
975    struct stat  hostBuf;
976    int result = fstat(process->sim_fd(fd), &hostBuf);
977#else
978    struct stat64  hostBuf;
979    int result = fstat64(process->sim_fd(fd), &hostBuf);
980#endif
981
982    if (result < 0)
983        return -errno;
984
985    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
986
987    return 0;
988}
989
990
991/// Target lstat() handler.
992template <class OS>
993SyscallReturn
994lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
995          ThreadContext *tc)
996{
997    std::string path;
998
999    int index = 0;
1000    if (!tc->getMemProxy().tryReadString(path,
1001                process->getSyscallArg(tc, index))) {
1002        return -EFAULT;
1003    }
1004    Addr bufPtr = process->getSyscallArg(tc, index);
1005
1006    // Adjust path for current working directory
1007    path = process->fullPath(path);
1008
1009    struct stat hostBuf;
1010    int result = lstat(path.c_str(), &hostBuf);
1011
1012    if (result < 0)
1013        return -errno;
1014
1015    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1016
1017    return 0;
1018}
1019
1020/// Target lstat64() handler.
1021template <class OS>
1022SyscallReturn
1023lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1024            ThreadContext *tc)
1025{
1026    std::string path;
1027
1028    int index = 0;
1029    if (!tc->getMemProxy().tryReadString(path,
1030                process->getSyscallArg(tc, index))) {
1031        return -EFAULT;
1032    }
1033    Addr bufPtr = process->getSyscallArg(tc, index);
1034
1035    // Adjust path for current working directory
1036    path = process->fullPath(path);
1037
1038#if NO_STAT64
1039    struct stat hostBuf;
1040    int result = lstat(path.c_str(), &hostBuf);
1041#else
1042    struct stat64 hostBuf;
1043    int result = lstat64(path.c_str(), &hostBuf);
1044#endif
1045
1046    if (result < 0)
1047        return -errno;
1048
1049    copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1050
1051    return 0;
1052}
1053
1054/// Target fstat() handler.
1055template <class OS>
1056SyscallReturn
1057fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1058          ThreadContext *tc)
1059{
1060    int index = 0;
1061    int fd = process->sim_fd(process->getSyscallArg(tc, index));
1062    Addr bufPtr = process->getSyscallArg(tc, index);
1063
1064    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
1065
1066    if (fd < 0)
1067        return -EBADF;
1068
1069    struct stat hostBuf;
1070    int result = fstat(fd, &hostBuf);
1071
1072    if (result < 0)
1073        return -errno;
1074
1075    copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1076
1077    return 0;
1078}
1079
1080
1081/// Target statfs() handler.
1082template <class OS>
1083SyscallReturn
1084statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1085           ThreadContext *tc)
1086{
1087    std::string path;
1088
1089    int index = 0;
1090    if (!tc->getMemProxy().tryReadString(path,
1091                process->getSyscallArg(tc, index))) {
1092        return -EFAULT;
1093    }
1094    Addr bufPtr = process->getSyscallArg(tc, index);
1095
1096    // Adjust path for current working directory
1097    path = process->fullPath(path);
1098
1099    struct statfs hostBuf;
1100    int result = statfs(path.c_str(), &hostBuf);
1101
1102    if (result < 0)
1103        return -errno;
1104
1105    OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1106
1107    return 0;
1108}
1109
1110
1111/// Target fstatfs() handler.
1112template <class OS>
1113SyscallReturn
1114fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1115            ThreadContext *tc)
1116{
1117    int index = 0;
1118    int fd = process->sim_fd(process->getSyscallArg(tc, index));
1119    Addr bufPtr = process->getSyscallArg(tc, index);
1120
1121    if (fd < 0)
1122        return -EBADF;
1123
1124    struct statfs hostBuf;
1125    int result = fstatfs(fd, &hostBuf);
1126
1127    if (result < 0)
1128        return -errno;
1129
1130    OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1131
1132    return 0;
1133}
1134
1135
1136/// Target writev() handler.
1137template <class OS>
1138SyscallReturn
1139writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1140           ThreadContext *tc)
1141{
1142    int index = 0;
1143    int fd = process->getSyscallArg(tc, index);
1144    if (fd < 0 || process->sim_fd(fd) < 0) {
1145        // doesn't map to any simulator fd: not a valid target fd
1146        return -EBADF;
1147    }
1148
1149    SETranslatingPortProxy &p = tc->getMemProxy();
1150    uint64_t tiov_base = process->getSyscallArg(tc, index);
1151    size_t count = process->getSyscallArg(tc, index);
1152    struct iovec hiov[count];
1153    for (size_t i = 0; i < count; ++i) {
1154        typename OS::tgt_iovec tiov;
1155
1156        p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1157                   (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1158        hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1159        hiov[i].iov_base = new char [hiov[i].iov_len];
1160        p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1161                   hiov[i].iov_len);
1162    }
1163
1164    int result = writev(process->sim_fd(fd), hiov, count);
1165
1166    for (size_t i = 0; i < count; ++i)
1167        delete [] (char *)hiov[i].iov_base;
1168
1169    if (result < 0)
1170        return -errno;
1171
1172    return result;
1173}
1174
1175
1176/// Target mmap() handler.
1177///
1178/// We don't really handle mmap().  If the target is mmaping an
1179/// anonymous region or /dev/zero, we can get away with doing basically
1180/// nothing (since memory is initialized to zero and the simulator
1181/// doesn't really check addresses anyway).
1182///
1183template <class OS>
1184SyscallReturn
1185mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1186{
1187    int index = 0;
1188    Addr start = p->getSyscallArg(tc, index);
1189    uint64_t length = p->getSyscallArg(tc, index);
1190    index++; // int prot = p->getSyscallArg(tc, index);
1191    int flags = p->getSyscallArg(tc, index);
1192    int tgt_fd = p->getSyscallArg(tc, index);
1193    int offset = p->getSyscallArg(tc, index);
1194
1195    if (length > 0x100000000ULL)
1196        warn("mmap length argument %#x is unreasonably large.\n", length);
1197
1198    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1199        Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1200        if (!fd_map || fd_map->fd < 0) {
1201            warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1202            return -EBADF;
1203        }
1204
1205        if (fd_map->filename != "/dev/zero") {
1206            // This is very likely broken, but leave a warning here
1207            // (rather than panic) in case /dev/zero is known by
1208            // another name on some platform
1209            warn("allowing mmap of file %s; mmap not supported on files"
1210                 " other than /dev/zero\n", fd_map->filename);
1211        }
1212    }
1213
1214    length = roundUp(length, TheISA::PageBytes);
1215
1216    if ((start  % TheISA::PageBytes) != 0 ||
1217        (offset % TheISA::PageBytes) != 0) {
1218        warn("mmap failing: arguments not page-aligned: "
1219             "start 0x%x offset 0x%x",
1220             start, offset);
1221        return -EINVAL;
1222    }
1223
1224    // are we ok with clobbering existing mappings?  only set this to
1225    // true if the user has been warned.
1226    bool clobber = false;
1227
1228    // try to use the caller-provided address if there is one
1229    bool use_provided_address = (start != 0);
1230
1231    if (use_provided_address) {
1232        // check to see if the desired address is already in use
1233        if (!p->pTable->isUnmapped(start, length)) {
1234            // there are existing mappings in the desired range
1235            // whether we clobber them or not depends on whether the caller
1236            // specified MAP_FIXED
1237            if (flags & OS::TGT_MAP_FIXED) {
1238                // MAP_FIXED specified: map attempt fails
1239                return -EINVAL;
1240            } else {
1241                // MAP_FIXED not specified: ignore suggested start address
1242                warn("mmap: ignoring suggested map address 0x%x\n", start);
1243                use_provided_address = false;
1244            }
1245        }
1246    }
1247
1248    if (!use_provided_address) {
1249        // no address provided, or provided address unusable:
1250        // pick next address from our "mmap region"
1251        if (OS::mmapGrowsDown()) {
1252            start = p->mmap_end - length;
1253            p->mmap_end = start;
1254        } else {
1255            start = p->mmap_end;
1256            p->mmap_end += length;
1257        }
1258    }
1259
1260    p->allocateMem(start, length, clobber);
1261
1262    return start;
1263}
1264
1265/// Target getrlimit() handler.
1266template <class OS>
1267SyscallReturn
1268getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1269        ThreadContext *tc)
1270{
1271    int index = 0;
1272    unsigned resource = process->getSyscallArg(tc, index);
1273    TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1274
1275    switch (resource) {
1276        case OS::TGT_RLIMIT_STACK:
1277            // max stack size in bytes: make up a number (8MB for now)
1278            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1279            rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1280            rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1281            break;
1282
1283        case OS::TGT_RLIMIT_DATA:
1284            // max data segment size in bytes: make up a number
1285            rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1286            rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1287            rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1288            break;
1289
1290        default:
1291            warn("getrlimit: unimplemented resource %d", resource);
1292            return -EINVAL;
1293            break;
1294    }
1295
1296    rlp.copyOut(tc->getMemProxy());
1297    return 0;
1298}
1299
1300/// Target clock_gettime() function.
1301template <class OS>
1302SyscallReturn
1303clock_gettimeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1304{
1305    int index = 1;
1306    //int clk_id = p->getSyscallArg(tc, index);
1307    TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1308
1309    getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1310    tp->tv_sec += seconds_since_epoch;
1311    tp->tv_sec = TheISA::htog(tp->tv_sec);
1312    tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1313
1314    tp.copyOut(tc->getMemProxy());
1315
1316    return 0;
1317}
1318
1319/// Target gettimeofday() handler.
1320template <class OS>
1321SyscallReturn
1322gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1323        ThreadContext *tc)
1324{
1325    int index = 0;
1326    TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1327
1328    getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1329    tp->tv_sec += seconds_since_epoch;
1330    tp->tv_sec = TheISA::htog(tp->tv_sec);
1331    tp->tv_usec = TheISA::htog(tp->tv_usec);
1332
1333    tp.copyOut(tc->getMemProxy());
1334
1335    return 0;
1336}
1337
1338
1339/// Target utimes() handler.
1340template <class OS>
1341SyscallReturn
1342utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1343           ThreadContext *tc)
1344{
1345    std::string path;
1346
1347    int index = 0;
1348    if (!tc->getMemProxy().tryReadString(path,
1349                process->getSyscallArg(tc, index))) {
1350        return -EFAULT;
1351    }
1352
1353    TypedBufferArg<typename OS::timeval [2]>
1354        tp(process->getSyscallArg(tc, index));
1355    tp.copyIn(tc->getMemProxy());
1356
1357    struct timeval hostTimeval[2];
1358    for (int i = 0; i < 2; ++i)
1359    {
1360        hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1361        hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1362    }
1363
1364    // Adjust path for current working directory
1365    path = process->fullPath(path);
1366
1367    int result = utimes(path.c_str(), hostTimeval);
1368
1369    if (result < 0)
1370        return -errno;
1371
1372    return 0;
1373}
1374/// Target getrusage() function.
1375template <class OS>
1376SyscallReturn
1377getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1378              ThreadContext *tc)
1379{
1380    int index = 0;
1381    int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1382    TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1383
1384    rup->ru_utime.tv_sec = 0;
1385    rup->ru_utime.tv_usec = 0;
1386    rup->ru_stime.tv_sec = 0;
1387    rup->ru_stime.tv_usec = 0;
1388    rup->ru_maxrss = 0;
1389    rup->ru_ixrss = 0;
1390    rup->ru_idrss = 0;
1391    rup->ru_isrss = 0;
1392    rup->ru_minflt = 0;
1393    rup->ru_majflt = 0;
1394    rup->ru_nswap = 0;
1395    rup->ru_inblock = 0;
1396    rup->ru_oublock = 0;
1397    rup->ru_msgsnd = 0;
1398    rup->ru_msgrcv = 0;
1399    rup->ru_nsignals = 0;
1400    rup->ru_nvcsw = 0;
1401    rup->ru_nivcsw = 0;
1402
1403    switch (who) {
1404      case OS::TGT_RUSAGE_SELF:
1405        getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1406        rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1407        rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1408        break;
1409
1410      case OS::TGT_RUSAGE_CHILDREN:
1411        // do nothing.  We have no child processes, so they take no time.
1412        break;
1413
1414      default:
1415        // don't really handle THREAD or CHILDREN, but just warn and
1416        // plow ahead
1417        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1418             who);
1419    }
1420
1421    rup.copyOut(tc->getMemProxy());
1422
1423    return 0;
1424}
1425
1426/// Target times() function.
1427template <class OS>
1428SyscallReturn
1429timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1430           ThreadContext *tc)
1431{
1432    int index = 0;
1433    TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1434
1435    // Fill in the time structure (in clocks)
1436    int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1437    bufp->tms_utime = clocks;
1438    bufp->tms_stime = 0;
1439    bufp->tms_cutime = 0;
1440    bufp->tms_cstime = 0;
1441
1442    // Convert to host endianness
1443    bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1444
1445    // Write back
1446    bufp.copyOut(tc->getMemProxy());
1447
1448    // Return clock ticks since system boot
1449    return clocks;
1450}
1451
1452/// Target time() function.
1453template <class OS>
1454SyscallReturn
1455timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1456           ThreadContext *tc)
1457{
1458    typename OS::time_t sec, usec;
1459    getElapsedTimeMicro(sec, usec);
1460    sec += seconds_since_epoch;
1461
1462    int index = 0;
1463    Addr taddr = (Addr)process->getSyscallArg(tc, index);
1464    if(taddr != 0) {
1465        typename OS::time_t t = sec;
1466        t = TheISA::htog(t);
1467        SETranslatingPortProxy &p = tc->getMemProxy();
1468        p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1469    }
1470    return sec;
1471}
1472
1473
1474#endif // __SIM_SYSCALL_EMUL_HH__
1475