syscall_emul.hh revision 8601 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 *          Kevin Lim
30 */
31
32#ifndef __SIM_SYSCALL_EMUL_HH__
33#define __SIM_SYSCALL_EMUL_HH__
34
35#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
36                   defined(__FreeBSD__) || defined(__CYGWIN__))
37
38///
39/// @file syscall_emul.hh
40///
41/// This file defines objects used to emulate syscalls from the target
42/// application on the host machine.
43
44#ifdef __CYGWIN32__
45#include <sys/fcntl.h>  // for O_BINARY
46#endif
47#include <sys/stat.h>
48#include <sys/time.h>
49#include <sys/uio.h>
50#include <fcntl.h>
51
52#include <cerrno>
53#include <string>
54
55#include "base/chunk_generator.hh"
56#include "base/intmath.hh"      // for RoundUp
57#include "base/misc.hh"
58#include "base/trace.hh"
59#include "base/types.hh"
60#include "config/the_isa.hh"
61#include "cpu/base.hh"
62#include "cpu/thread_context.hh"
63#include "debug/SyscallVerbose.hh"
64#include "mem/page_table.hh"
65#include "mem/translating_port.hh"
66#include "sim/byteswap.hh"
67#include "sim/process.hh"
68#include "sim/system.hh"
69
70///
71/// System call descriptor.
72///
73class SyscallDesc {
74
75  public:
76
77    /// Typedef for target syscall handler functions.
78    typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
79                           LiveProcess *, ThreadContext *);
80
81    const char *name;   //!< Syscall name (e.g., "open").
82    FuncPtr funcPtr;    //!< Pointer to emulation function.
83    int flags;          //!< Flags (see Flags enum).
84
85    /// Flag values for controlling syscall behavior.
86    enum Flags {
87        /// Don't set return regs according to funcPtr return value.
88        /// Used for syscalls with non-standard return conventions
89        /// that explicitly set the ThreadContext regs (e.g.,
90        /// sigreturn).
91        SuppressReturnValue = 1
92    };
93
94    /// Constructor.
95    SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
96        : name(_name), funcPtr(_funcPtr), flags(_flags)
97    {
98    }
99
100    /// Emulate the syscall.  Public interface for calling through funcPtr.
101    void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
102};
103
104
105class BaseBufferArg {
106
107  public:
108
109    BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
110    {
111        bufPtr = new uint8_t[size];
112        // clear out buffer: in case we only partially populate this,
113        // and then do a copyOut(), we want to make sure we don't
114        // introduce any random junk into the simulated address space
115        memset(bufPtr, 0, size);
116    }
117
118    virtual ~BaseBufferArg() { delete [] bufPtr; }
119
120    //
121    // copy data into simulator space (read from target memory)
122    //
123    virtual bool copyIn(TranslatingPort *memport)
124    {
125        memport->readBlob(addr, bufPtr, size);
126        return true;    // no EFAULT detection for now
127    }
128
129    //
130    // copy data out of simulator space (write to target memory)
131    //
132    virtual bool copyOut(TranslatingPort *memport)
133    {
134        memport->writeBlob(addr, bufPtr, size);
135        return true;    // no EFAULT detection for now
136    }
137
138  protected:
139    Addr addr;
140    int size;
141    uint8_t *bufPtr;
142};
143
144
145class BufferArg : public BaseBufferArg
146{
147  public:
148    BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
149    void *bufferPtr()   { return bufPtr; }
150};
151
152template <class T>
153class TypedBufferArg : public BaseBufferArg
154{
155  public:
156    // user can optionally specify a specific number of bytes to
157    // allocate to deal with those structs that have variable-size
158    // arrays at the end
159    TypedBufferArg(Addr _addr, int _size = sizeof(T))
160        : BaseBufferArg(_addr, _size)
161    { }
162
163    // type case
164    operator T*() { return (T *)bufPtr; }
165
166    // dereference operators
167    T &operator*()       { return *((T *)bufPtr); }
168    T* operator->()      { return (T *)bufPtr; }
169    T &operator[](int i) { return ((T *)bufPtr)[i]; }
170};
171
172//////////////////////////////////////////////////////////////////////
173//
174// The following emulation functions are generic enough that they
175// don't need to be recompiled for different emulated OS's.  They are
176// defined in sim/syscall_emul.cc.
177//
178//////////////////////////////////////////////////////////////////////
179
180
181/// Handler for unimplemented syscalls that we haven't thought about.
182SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
183                                LiveProcess *p, ThreadContext *tc);
184
185/// Handler for unimplemented syscalls that we never intend to
186/// implement (signal handling, etc.) and should not affect the correct
187/// behavior of the program.  Print a warning only if the appropriate
188/// trace flag is enabled.  Return success to the target program.
189SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
190                         LiveProcess *p, ThreadContext *tc);
191SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
192                         LiveProcess *p, ThreadContext *tc);
193
194/// Target exit() handler: terminate current context.
195SyscallReturn exitFunc(SyscallDesc *desc, int num,
196                       LiveProcess *p, ThreadContext *tc);
197
198/// Target exit_group() handler: terminate simulation. (exit all threads)
199SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
200                       LiveProcess *p, ThreadContext *tc);
201
202/// Target getpagesize() handler.
203SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
204                              LiveProcess *p, ThreadContext *tc);
205
206/// Target brk() handler: set brk address.
207SyscallReturn brkFunc(SyscallDesc *desc, int num,
208                      LiveProcess *p, ThreadContext *tc);
209
210/// Target close() handler.
211SyscallReturn closeFunc(SyscallDesc *desc, int num,
212                        LiveProcess *p, ThreadContext *tc);
213
214/// Target read() handler.
215SyscallReturn readFunc(SyscallDesc *desc, int num,
216                       LiveProcess *p, ThreadContext *tc);
217
218/// Target write() handler.
219SyscallReturn writeFunc(SyscallDesc *desc, int num,
220                        LiveProcess *p, ThreadContext *tc);
221
222/// Target lseek() handler.
223SyscallReturn lseekFunc(SyscallDesc *desc, int num,
224                        LiveProcess *p, ThreadContext *tc);
225
226/// Target _llseek() handler.
227SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
228                        LiveProcess *p, ThreadContext *tc);
229
230/// Target munmap() handler.
231SyscallReturn munmapFunc(SyscallDesc *desc, int num,
232                         LiveProcess *p, ThreadContext *tc);
233
234/// Target gethostname() handler.
235SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
236                              LiveProcess *p, ThreadContext *tc);
237
238/// Target getcwd() handler.
239SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
240                         LiveProcess *p, ThreadContext *tc);
241
242/// Target unlink() handler.
243SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
244                           LiveProcess *p, ThreadContext *tc);
245
246/// Target unlink() handler.
247SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
248                         LiveProcess *p, ThreadContext *tc);
249
250/// Target mkdir() handler.
251SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
252                        LiveProcess *p, ThreadContext *tc);
253
254/// Target rename() handler.
255SyscallReturn renameFunc(SyscallDesc *desc, int num,
256                         LiveProcess *p, ThreadContext *tc);
257
258
259/// Target truncate() handler.
260SyscallReturn truncateFunc(SyscallDesc *desc, int num,
261                           LiveProcess *p, ThreadContext *tc);
262
263
264/// Target ftruncate() handler.
265SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
266                            LiveProcess *p, ThreadContext *tc);
267
268
269/// Target truncate64() handler.
270SyscallReturn truncate64Func(SyscallDesc *desc, int num,
271                             LiveProcess *p, ThreadContext *tc);
272
273/// Target ftruncate64() handler.
274SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
275                              LiveProcess *p, ThreadContext *tc);
276
277
278/// Target umask() handler.
279SyscallReturn umaskFunc(SyscallDesc *desc, int num,
280                        LiveProcess *p, ThreadContext *tc);
281
282
283/// Target chown() handler.
284SyscallReturn chownFunc(SyscallDesc *desc, int num,
285                        LiveProcess *p, ThreadContext *tc);
286
287
288/// Target fchown() handler.
289SyscallReturn fchownFunc(SyscallDesc *desc, int num,
290                         LiveProcess *p, ThreadContext *tc);
291
292/// Target dup() handler.
293SyscallReturn dupFunc(SyscallDesc *desc, int num,
294                      LiveProcess *process, ThreadContext *tc);
295
296/// Target fnctl() handler.
297SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
298                        LiveProcess *process, ThreadContext *tc);
299
300/// Target fcntl64() handler.
301SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
302                        LiveProcess *process, ThreadContext *tc);
303
304/// Target setuid() handler.
305SyscallReturn setuidFunc(SyscallDesc *desc, int num,
306                               LiveProcess *p, ThreadContext *tc);
307
308/// Target getpid() handler.
309SyscallReturn getpidFunc(SyscallDesc *desc, int num,
310                               LiveProcess *p, ThreadContext *tc);
311
312/// Target getuid() handler.
313SyscallReturn getuidFunc(SyscallDesc *desc, int num,
314                               LiveProcess *p, ThreadContext *tc);
315
316/// Target getgid() handler.
317SyscallReturn getgidFunc(SyscallDesc *desc, int num,
318                               LiveProcess *p, ThreadContext *tc);
319
320/// Target getppid() handler.
321SyscallReturn getppidFunc(SyscallDesc *desc, int num,
322                               LiveProcess *p, ThreadContext *tc);
323
324/// Target geteuid() handler.
325SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
326                               LiveProcess *p, ThreadContext *tc);
327
328/// Target getegid() handler.
329SyscallReturn getegidFunc(SyscallDesc *desc, int num,
330                               LiveProcess *p, ThreadContext *tc);
331
332/// Target clone() handler.
333SyscallReturn cloneFunc(SyscallDesc *desc, int num,
334                               LiveProcess *p, ThreadContext *tc);
335
336
337/// Pseudo Funcs  - These functions use a different return convension,
338/// returning a second value in a register other than the normal return register
339SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
340                             LiveProcess *process, ThreadContext *tc);
341
342/// Target getpidPseudo() handler.
343SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
344                               LiveProcess *p, ThreadContext *tc);
345
346/// Target getuidPseudo() handler.
347SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
348                               LiveProcess *p, ThreadContext *tc);
349
350/// Target getgidPseudo() handler.
351SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
352                               LiveProcess *p, ThreadContext *tc);
353
354
355/// A readable name for 1,000,000, for converting microseconds to seconds.
356const int one_million = 1000000;
357
358/// Approximate seconds since the epoch (1/1/1970).  About a billion,
359/// by my reckoning.  We want to keep this a constant (not use the
360/// real-world time) to keep simulations repeatable.
361const unsigned seconds_since_epoch = 1000000000;
362
363/// Helper function to convert current elapsed time to seconds and
364/// microseconds.
365template <class T1, class T2>
366void
367getElapsedTime(T1 &sec, T2 &usec)
368{
369    int elapsed_usecs = curTick() / SimClock::Int::us;
370    sec = elapsed_usecs / one_million;
371    usec = elapsed_usecs % one_million;
372}
373
374//////////////////////////////////////////////////////////////////////
375//
376// The following emulation functions are generic, but need to be
377// templated to account for differences in types, constants, etc.
378//
379//////////////////////////////////////////////////////////////////////
380
381#if NO_STAT64
382    typedef struct stat hst_stat;
383    typedef struct stat hst_stat64;
384#else
385    typedef struct stat hst_stat;
386    typedef struct stat64 hst_stat64;
387#endif
388
389//// Helper function to convert a host stat buffer to a target stat
390//// buffer.  Also copies the target buffer out to the simulated
391//// memory space.  Used by stat(), fstat(), and lstat().
392
393template <typename target_stat, typename host_stat>
394static void
395convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
396{
397    using namespace TheISA;
398
399    if (fakeTTY)
400        tgt->st_dev = 0xA;
401    else
402        tgt->st_dev = host->st_dev;
403    tgt->st_dev = htog(tgt->st_dev);
404    tgt->st_ino = host->st_ino;
405    tgt->st_ino = htog(tgt->st_ino);
406    tgt->st_mode = host->st_mode;
407    if (fakeTTY) {
408        // Claim to be a character device
409        tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
410        tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
411    }
412    tgt->st_mode = htog(tgt->st_mode);
413    tgt->st_nlink = host->st_nlink;
414    tgt->st_nlink = htog(tgt->st_nlink);
415    tgt->st_uid = host->st_uid;
416    tgt->st_uid = htog(tgt->st_uid);
417    tgt->st_gid = host->st_gid;
418    tgt->st_gid = htog(tgt->st_gid);
419    if (fakeTTY)
420        tgt->st_rdev = 0x880d;
421    else
422        tgt->st_rdev = host->st_rdev;
423    tgt->st_rdev = htog(tgt->st_rdev);
424    tgt->st_size = host->st_size;
425    tgt->st_size = htog(tgt->st_size);
426    tgt->st_atimeX = host->st_atime;
427    tgt->st_atimeX = htog(tgt->st_atimeX);
428    tgt->st_mtimeX = host->st_mtime;
429    tgt->st_mtimeX = htog(tgt->st_mtimeX);
430    tgt->st_ctimeX = host->st_ctime;
431    tgt->st_ctimeX = htog(tgt->st_ctimeX);
432    // Force the block size to be 8k. This helps to ensure buffered io works
433    // consistently across different hosts.
434    tgt->st_blksize = 0x2000;
435    tgt->st_blksize = htog(tgt->st_blksize);
436    tgt->st_blocks = host->st_blocks;
437    tgt->st_blocks = htog(tgt->st_blocks);
438}
439
440// Same for stat64
441
442template <typename target_stat, typename host_stat64>
443static void
444convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
445{
446    using namespace TheISA;
447
448    convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
449#if defined(STAT_HAVE_NSEC)
450    tgt->st_atime_nsec = host->st_atime_nsec;
451    tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
452    tgt->st_mtime_nsec = host->st_mtime_nsec;
453    tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
454    tgt->st_ctime_nsec = host->st_ctime_nsec;
455    tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
456#else
457    tgt->st_atime_nsec = 0;
458    tgt->st_mtime_nsec = 0;
459    tgt->st_ctime_nsec = 0;
460#endif
461}
462
463//Here are a couple convenience functions
464template<class OS>
465static void
466copyOutStatBuf(TranslatingPort * mem, Addr addr,
467        hst_stat *host, bool fakeTTY = false)
468{
469    typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
470    tgt_stat_buf tgt(addr);
471    convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
472    tgt.copyOut(mem);
473}
474
475template<class OS>
476static void
477copyOutStat64Buf(TranslatingPort * mem, Addr addr,
478        hst_stat64 *host, bool fakeTTY = false)
479{
480    typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
481    tgt_stat_buf tgt(addr);
482    convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
483    tgt.copyOut(mem);
484}
485
486/// Target ioctl() handler.  For the most part, programs call ioctl()
487/// only to find out if their stdout is a tty, to determine whether to
488/// do line or block buffering.
489template <class OS>
490SyscallReturn
491ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
492          ThreadContext *tc)
493{
494    int index = 0;
495    int fd = process->getSyscallArg(tc, index);
496    unsigned req = process->getSyscallArg(tc, index);
497
498    DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
499
500    if (fd < 0 || process->sim_fd(fd) < 0) {
501        // doesn't map to any simulator fd: not a valid target fd
502        return -EBADF;
503    }
504
505    switch (req) {
506      case OS::TIOCISATTY_:
507      case OS::TIOCGETP_:
508      case OS::TIOCSETP_:
509      case OS::TIOCSETN_:
510      case OS::TIOCSETC_:
511      case OS::TIOCGETC_:
512      case OS::TIOCGETS_:
513      case OS::TIOCGETA_:
514      case OS::TCSETAW_:
515        return -ENOTTY;
516
517      default:
518        fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
519              fd, req, tc->pcState());
520    }
521}
522
523/// Target open() handler.
524template <class OS>
525SyscallReturn
526openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
527         ThreadContext *tc)
528{
529    std::string path;
530
531    int index = 0;
532    if (!tc->getMemPort()->tryReadString(path,
533                process->getSyscallArg(tc, index)))
534        return -EFAULT;
535
536    if (path == "/dev/sysdev0") {
537        // This is a memory-mapped high-resolution timer device on Alpha.
538        // We don't support it, so just punt.
539        warn("Ignoring open(%s, ...)\n", path);
540        return -ENOENT;
541    }
542
543    int tgtFlags = process->getSyscallArg(tc, index);
544    int mode = process->getSyscallArg(tc, index);
545    int hostFlags = 0;
546
547    // translate open flags
548    for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
549        if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
550            tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
551            hostFlags |= OS::openFlagTable[i].hostFlag;
552        }
553    }
554
555    // any target flags left?
556    if (tgtFlags != 0)
557        warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
558
559#ifdef __CYGWIN32__
560    hostFlags |= O_BINARY;
561#endif
562
563    // Adjust path for current working directory
564    path = process->fullPath(path);
565
566    DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
567
568    int fd;
569    if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
570        !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
571        // It's a proc/sys entery and requires special handling
572        fd = OS::openSpecialFile(path, process, tc);
573        return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
574     } else {
575        // open the file
576        fd = open(path.c_str(), hostFlags, mode);
577        return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
578     }
579
580}
581
582/// Target sysinfo() handler.
583template <class OS>
584SyscallReturn
585sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
586         ThreadContext *tc)
587{
588
589    int index = 0;
590    TypedBufferArg<typename OS::tgt_sysinfo>
591        sysinfo(process->getSyscallArg(tc, index));
592
593    sysinfo->uptime=seconds_since_epoch;
594    sysinfo->totalram=process->system->memSize();
595
596    sysinfo.copyOut(tc->getMemPort());
597
598    return 0;
599}
600
601/// Target chmod() handler.
602template <class OS>
603SyscallReturn
604chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
605          ThreadContext *tc)
606{
607    std::string path;
608
609    int index = 0;
610    if (!tc->getMemPort()->tryReadString(path,
611                process->getSyscallArg(tc, index))) {
612        return -EFAULT;
613    }
614
615    uint32_t mode = process->getSyscallArg(tc, index);
616    mode_t hostMode = 0;
617
618    // XXX translate mode flags via OS::something???
619    hostMode = mode;
620
621    // Adjust path for current working directory
622    path = process->fullPath(path);
623
624    // do the chmod
625    int result = chmod(path.c_str(), hostMode);
626    if (result < 0)
627        return -errno;
628
629    return 0;
630}
631
632
633/// Target fchmod() handler.
634template <class OS>
635SyscallReturn
636fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
637           ThreadContext *tc)
638{
639    int index = 0;
640    int fd = process->getSyscallArg(tc, index);
641    if (fd < 0 || process->sim_fd(fd) < 0) {
642        // doesn't map to any simulator fd: not a valid target fd
643        return -EBADF;
644    }
645
646    uint32_t mode = process->getSyscallArg(tc, index);
647    mode_t hostMode = 0;
648
649    // XXX translate mode flags via OS::someting???
650    hostMode = mode;
651
652    // do the fchmod
653    int result = fchmod(process->sim_fd(fd), hostMode);
654    if (result < 0)
655        return -errno;
656
657    return 0;
658}
659
660/// Target mremap() handler.
661template <class OS>
662SyscallReturn
663mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
664{
665    int index = 0;
666    Addr start = process->getSyscallArg(tc, index);
667    uint64_t old_length = process->getSyscallArg(tc, index);
668    uint64_t new_length = process->getSyscallArg(tc, index);
669    uint64_t flags = process->getSyscallArg(tc, index);
670
671    if ((start % TheISA::VMPageSize != 0) ||
672            (new_length % TheISA::VMPageSize != 0)) {
673        warn("mremap failing: arguments not page aligned");
674        return -EINVAL;
675    }
676
677    if (new_length > old_length) {
678        if ((start + old_length) == process->mmap_end) {
679            uint64_t diff = new_length - old_length;
680            process->allocateMem(process->mmap_end, diff);
681            process->mmap_end += diff;
682            return start;
683        } else {
684            // sys/mman.h defined MREMAP_MAYMOVE
685            if (!(flags & 1)) {
686                warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
687                return -ENOMEM;
688            } else {
689                process->pTable->remap(start, old_length, process->mmap_end);
690                warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
691                        process->mmap_end, process->mmap_end + new_length, new_length);
692                start = process->mmap_end;
693                // add on the remaining unallocated pages
694                process->allocateMem(start + old_length,
695                                     new_length - old_length);
696                process->mmap_end += new_length;
697                warn("returning %08p as start\n", start);
698                return start;
699            }
700        }
701    } else {
702        process->pTable->unmap(start + new_length, old_length - new_length);
703        return start;
704    }
705}
706
707/// Target stat() handler.
708template <class OS>
709SyscallReturn
710statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
711         ThreadContext *tc)
712{
713    std::string path;
714
715    int index = 0;
716    if (!tc->getMemPort()->tryReadString(path,
717                process->getSyscallArg(tc, index))) {
718        return -EFAULT;
719    }
720    Addr bufPtr = process->getSyscallArg(tc, index);
721
722    // Adjust path for current working directory
723    path = process->fullPath(path);
724
725    struct stat hostBuf;
726    int result = stat(path.c_str(), &hostBuf);
727
728    if (result < 0)
729        return -errno;
730
731    copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
732
733    return 0;
734}
735
736
737/// Target stat64() handler.
738template <class OS>
739SyscallReturn
740stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
741           ThreadContext *tc)
742{
743    std::string path;
744
745    int index = 0;
746    if (!tc->getMemPort()->tryReadString(path,
747                process->getSyscallArg(tc, index)))
748        return -EFAULT;
749    Addr bufPtr = process->getSyscallArg(tc, index);
750
751    // Adjust path for current working directory
752    path = process->fullPath(path);
753
754#if NO_STAT64
755    struct stat  hostBuf;
756    int result = stat(path.c_str(), &hostBuf);
757#else
758    struct stat64 hostBuf;
759    int result = stat64(path.c_str(), &hostBuf);
760#endif
761
762    if (result < 0)
763        return -errno;
764
765    copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
766
767    return 0;
768}
769
770
771/// Target fstat64() handler.
772template <class OS>
773SyscallReturn
774fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
775            ThreadContext *tc)
776{
777    int index = 0;
778    int fd = process->getSyscallArg(tc, index);
779    Addr bufPtr = process->getSyscallArg(tc, index);
780    if (fd < 0 || process->sim_fd(fd) < 0) {
781        // doesn't map to any simulator fd: not a valid target fd
782        return -EBADF;
783    }
784
785#if NO_STAT64
786    struct stat  hostBuf;
787    int result = fstat(process->sim_fd(fd), &hostBuf);
788#else
789    struct stat64  hostBuf;
790    int result = fstat64(process->sim_fd(fd), &hostBuf);
791#endif
792
793    if (result < 0)
794        return -errno;
795
796    copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
797
798    return 0;
799}
800
801
802/// Target lstat() handler.
803template <class OS>
804SyscallReturn
805lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
806          ThreadContext *tc)
807{
808    std::string path;
809
810    int index = 0;
811    if (!tc->getMemPort()->tryReadString(path,
812                process->getSyscallArg(tc, index))) {
813        return -EFAULT;
814    }
815    Addr bufPtr = process->getSyscallArg(tc, index);
816
817    // Adjust path for current working directory
818    path = process->fullPath(path);
819
820    struct stat hostBuf;
821    int result = lstat(path.c_str(), &hostBuf);
822
823    if (result < 0)
824        return -errno;
825
826    copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
827
828    return 0;
829}
830
831/// Target lstat64() handler.
832template <class OS>
833SyscallReturn
834lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
835            ThreadContext *tc)
836{
837    std::string path;
838
839    int index = 0;
840    if (!tc->getMemPort()->tryReadString(path,
841                process->getSyscallArg(tc, index))) {
842        return -EFAULT;
843    }
844    Addr bufPtr = process->getSyscallArg(tc, index);
845
846    // Adjust path for current working directory
847    path = process->fullPath(path);
848
849#if NO_STAT64
850    struct stat hostBuf;
851    int result = lstat(path.c_str(), &hostBuf);
852#else
853    struct stat64 hostBuf;
854    int result = lstat64(path.c_str(), &hostBuf);
855#endif
856
857    if (result < 0)
858        return -errno;
859
860    copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
861
862    return 0;
863}
864
865/// Target fstat() handler.
866template <class OS>
867SyscallReturn
868fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
869          ThreadContext *tc)
870{
871    int index = 0;
872    int fd = process->sim_fd(process->getSyscallArg(tc, index));
873    Addr bufPtr = process->getSyscallArg(tc, index);
874
875    DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
876
877    if (fd < 0)
878        return -EBADF;
879
880    struct stat hostBuf;
881    int result = fstat(fd, &hostBuf);
882
883    if (result < 0)
884        return -errno;
885
886    copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
887
888    return 0;
889}
890
891
892/// Target statfs() handler.
893template <class OS>
894SyscallReturn
895statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
896           ThreadContext *tc)
897{
898    std::string path;
899
900    int index = 0;
901    if (!tc->getMemPort()->tryReadString(path,
902                process->getSyscallArg(tc, index))) {
903        return -EFAULT;
904    }
905    Addr bufPtr = process->getSyscallArg(tc, index);
906
907    // Adjust path for current working directory
908    path = process->fullPath(path);
909
910    struct statfs hostBuf;
911    int result = statfs(path.c_str(), &hostBuf);
912
913    if (result < 0)
914        return -errno;
915
916    OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
917
918    return 0;
919}
920
921
922/// Target fstatfs() handler.
923template <class OS>
924SyscallReturn
925fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
926            ThreadContext *tc)
927{
928    int index = 0;
929    int fd = process->sim_fd(process->getSyscallArg(tc, index));
930    Addr bufPtr = process->getSyscallArg(tc, index);
931
932    if (fd < 0)
933        return -EBADF;
934
935    struct statfs hostBuf;
936    int result = fstatfs(fd, &hostBuf);
937
938    if (result < 0)
939        return -errno;
940
941    OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
942
943    return 0;
944}
945
946
947/// Target writev() handler.
948template <class OS>
949SyscallReturn
950writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
951           ThreadContext *tc)
952{
953    int index = 0;
954    int fd = process->getSyscallArg(tc, index);
955    if (fd < 0 || process->sim_fd(fd) < 0) {
956        // doesn't map to any simulator fd: not a valid target fd
957        return -EBADF;
958    }
959
960    TranslatingPort *p = tc->getMemPort();
961    uint64_t tiov_base = process->getSyscallArg(tc, index);
962    size_t count = process->getSyscallArg(tc, index);
963    struct iovec hiov[count];
964    for (size_t i = 0; i < count; ++i) {
965        typename OS::tgt_iovec tiov;
966
967        p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
968                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
969        hiov[i].iov_len = gtoh(tiov.iov_len);
970        hiov[i].iov_base = new char [hiov[i].iov_len];
971        p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
972                    hiov[i].iov_len);
973    }
974
975    int result = writev(process->sim_fd(fd), hiov, count);
976
977    for (size_t i = 0; i < count; ++i)
978        delete [] (char *)hiov[i].iov_base;
979
980    if (result < 0)
981        return -errno;
982
983    return 0;
984}
985
986
987/// Target mmap() handler.
988///
989/// We don't really handle mmap().  If the target is mmaping an
990/// anonymous region or /dev/zero, we can get away with doing basically
991/// nothing (since memory is initialized to zero and the simulator
992/// doesn't really check addresses anyway).
993///
994template <class OS>
995SyscallReturn
996mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
997{
998    int index = 0;
999    Addr start = p->getSyscallArg(tc, index);
1000    uint64_t length = p->getSyscallArg(tc, index);
1001    index++; // int prot = p->getSyscallArg(tc, index);
1002    int flags = p->getSyscallArg(tc, index);
1003    int tgt_fd = p->getSyscallArg(tc, index);
1004    // int offset = p->getSyscallArg(tc, index);
1005
1006    if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1007        Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1008        if (!fd_map || fd_map->fd < 0) {
1009            warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1010            return -EBADF;
1011        }
1012
1013        if (fd_map->filename != "/dev/zero") {
1014            // This is very likely broken, but leave a warning here
1015            // (rather than panic) in case /dev/zero is known by
1016            // another name on some platform
1017            warn("allowing mmap of file %s; mmap not supported on files"
1018                 " other than /dev/zero\n", fd_map->filename);
1019        }
1020    }
1021
1022    if ((start  % TheISA::VMPageSize) != 0 ||
1023        (length % TheISA::VMPageSize) != 0) {
1024        warn("mmap failing: arguments not page-aligned: "
1025             "start 0x%x length 0x%x",
1026             start, length);
1027        return -EINVAL;
1028    }
1029
1030    // are we ok with clobbering existing mappings?  only set this to
1031    // true if the user has been warned.
1032    bool clobber = false;
1033
1034    // try to use the caller-provided address if there is one
1035    bool use_provided_address = (start != 0);
1036
1037    if (use_provided_address) {
1038        // check to see if the desired address is already in use
1039        if (!p->pTable->isUnmapped(start, length)) {
1040            // there are existing mappings in the desired range
1041            // whether we clobber them or not depends on whether the caller
1042            // specified MAP_FIXED
1043            if (flags & OS::TGT_MAP_FIXED) {
1044                // MAP_FIXED specified: clobber existing mappings
1045                warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
1046                     start);
1047                clobber = true;
1048            } else {
1049                // MAP_FIXED not specified: ignore suggested start address
1050                warn("mmap: ignoring suggested map address 0x%x\n", start);
1051                use_provided_address = false;
1052            }
1053        }
1054    }
1055
1056    if (!use_provided_address) {
1057        // no address provided, or provided address unusable:
1058        // pick next address from our "mmap region"
1059        if (OS::mmapGrowsDown()) {
1060            start = p->mmap_end - length;
1061            p->mmap_end = start;
1062        } else {
1063            start = p->mmap_end;
1064            p->mmap_end += length;
1065        }
1066    }
1067
1068    p->allocateMem(start, length, clobber);
1069
1070    return start;
1071}
1072
1073/// Target getrlimit() handler.
1074template <class OS>
1075SyscallReturn
1076getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1077        ThreadContext *tc)
1078{
1079    int index = 0;
1080    unsigned resource = process->getSyscallArg(tc, index);
1081    TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1082
1083    switch (resource) {
1084        case OS::TGT_RLIMIT_STACK:
1085            // max stack size in bytes: make up a number (8MB for now)
1086            rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1087            rlp->rlim_cur = htog(rlp->rlim_cur);
1088            rlp->rlim_max = htog(rlp->rlim_max);
1089            break;
1090
1091        case OS::TGT_RLIMIT_DATA:
1092            // max data segment size in bytes: make up a number
1093            rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1094            rlp->rlim_cur = htog(rlp->rlim_cur);
1095            rlp->rlim_max = htog(rlp->rlim_max);
1096            break;
1097
1098        default:
1099            std::cerr << "getrlimitFunc: unimplemented resource " << resource
1100                << std::endl;
1101            abort();
1102            break;
1103    }
1104
1105    rlp.copyOut(tc->getMemPort());
1106    return 0;
1107}
1108
1109/// Target gettimeofday() handler.
1110template <class OS>
1111SyscallReturn
1112gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1113        ThreadContext *tc)
1114{
1115    int index = 0;
1116    TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1117
1118    getElapsedTime(tp->tv_sec, tp->tv_usec);
1119    tp->tv_sec += seconds_since_epoch;
1120    tp->tv_sec = TheISA::htog(tp->tv_sec);
1121    tp->tv_usec = TheISA::htog(tp->tv_usec);
1122
1123    tp.copyOut(tc->getMemPort());
1124
1125    return 0;
1126}
1127
1128
1129/// Target utimes() handler.
1130template <class OS>
1131SyscallReturn
1132utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1133           ThreadContext *tc)
1134{
1135    std::string path;
1136
1137    int index = 0;
1138    if (!tc->getMemPort()->tryReadString(path,
1139                process->getSyscallArg(tc, index))) {
1140        return -EFAULT;
1141    }
1142
1143    TypedBufferArg<typename OS::timeval [2]>
1144        tp(process->getSyscallArg(tc, index));
1145    tp.copyIn(tc->getMemPort());
1146
1147    struct timeval hostTimeval[2];
1148    for (int i = 0; i < 2; ++i)
1149    {
1150        hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
1151        hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
1152    }
1153
1154    // Adjust path for current working directory
1155    path = process->fullPath(path);
1156
1157    int result = utimes(path.c_str(), hostTimeval);
1158
1159    if (result < 0)
1160        return -errno;
1161
1162    return 0;
1163}
1164/// Target getrusage() function.
1165template <class OS>
1166SyscallReturn
1167getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1168              ThreadContext *tc)
1169{
1170    int index = 0;
1171    int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1172    TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1173
1174    rup->ru_utime.tv_sec = 0;
1175    rup->ru_utime.tv_usec = 0;
1176    rup->ru_stime.tv_sec = 0;
1177    rup->ru_stime.tv_usec = 0;
1178    rup->ru_maxrss = 0;
1179    rup->ru_ixrss = 0;
1180    rup->ru_idrss = 0;
1181    rup->ru_isrss = 0;
1182    rup->ru_minflt = 0;
1183    rup->ru_majflt = 0;
1184    rup->ru_nswap = 0;
1185    rup->ru_inblock = 0;
1186    rup->ru_oublock = 0;
1187    rup->ru_msgsnd = 0;
1188    rup->ru_msgrcv = 0;
1189    rup->ru_nsignals = 0;
1190    rup->ru_nvcsw = 0;
1191    rup->ru_nivcsw = 0;
1192
1193    switch (who) {
1194      case OS::TGT_RUSAGE_SELF:
1195        getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1196        rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1197        rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1198        break;
1199
1200      case OS::TGT_RUSAGE_CHILDREN:
1201        // do nothing.  We have no child processes, so they take no time.
1202        break;
1203
1204      default:
1205        // don't really handle THREAD or CHILDREN, but just warn and
1206        // plow ahead
1207        warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1208             who);
1209    }
1210
1211    rup.copyOut(tc->getMemPort());
1212
1213    return 0;
1214}
1215
1216/// Target times() function.
1217template <class OS>
1218SyscallReturn
1219timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1220           ThreadContext *tc)
1221{
1222    int index = 0;
1223    TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1224
1225    // Fill in the time structure (in clocks)
1226    int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1227    bufp->tms_utime = clocks;
1228    bufp->tms_stime = 0;
1229    bufp->tms_cutime = 0;
1230    bufp->tms_cstime = 0;
1231
1232    // Convert to host endianness
1233    bufp->tms_utime = htog(bufp->tms_utime);
1234
1235    // Write back
1236    bufp.copyOut(tc->getMemPort());
1237
1238    // Return clock ticks since system boot
1239    return clocks;
1240}
1241
1242/// Target time() function.
1243template <class OS>
1244SyscallReturn
1245timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1246           ThreadContext *tc)
1247{
1248    typename OS::time_t sec, usec;
1249    getElapsedTime(sec, usec);
1250    sec += seconds_since_epoch;
1251
1252    int index = 0;
1253    Addr taddr = (Addr)process->getSyscallArg(tc, index);
1254    if(taddr != 0) {
1255        typename OS::time_t t = sec;
1256        t = htog(t);
1257        TranslatingPort *p = tc->getMemPort();
1258        p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1259    }
1260    return sec;
1261}
1262
1263
1264#endif // __SIM_SYSCALL_EMUL_HH__
1265