1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 * Kevin Lim
30 */
31
32#ifndef __SIM_SYSCALL_EMUL_HH__
33#define __SIM_SYSCALL_EMUL_HH__
34
35#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
36 defined(__FreeBSD__) || defined(__CYGWIN__))
37
38///
39/// @file syscall_emul.hh
40///
41/// This file defines objects used to emulate syscalls from the target
42/// application on the host machine.
43
44#include <errno.h>
45#include <string>
46#ifdef __CYGWIN32__
47#include <sys/fcntl.h> // for O_BINARY
48#endif
49#include <sys/stat.h>
50#include <fcntl.h>
51#include <sys/uio.h>
52
53#include "sim/host.hh" // for Addr
54#include "base/chunk_generator.hh"
55#include "base/intmath.hh" // for RoundUp
56#include "base/misc.hh"
57#include "base/trace.hh"
58#include "cpu/base.hh"
59#include "cpu/thread_context.hh"
60#include "mem/translating_port.hh"
61#include "mem/page_table.hh"
62#include "sim/process.hh"
63
64///
65/// System call descriptor.
66///
67class SyscallDesc {
68
69 public:
70
71 /// Typedef for target syscall handler functions.
72 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
73 Process *, ThreadContext *);
74
75 const char *name; //!< Syscall name (e.g., "open").
76 FuncPtr funcPtr; //!< Pointer to emulation function.
77 int flags; //!< Flags (see Flags enum).
78
79 /// Flag values for controlling syscall behavior.
80 enum Flags {
81 /// Don't set return regs according to funcPtr return value.
82 /// Used for syscalls with non-standard return conventions
83 /// that explicitly set the ThreadContext regs (e.g.,
84 /// sigreturn).
85 SuppressReturnValue = 1
86 };
87
88 /// Constructor.
89 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
90 : name(_name), funcPtr(_funcPtr), flags(_flags)
91 {
92 }
93
94 /// Emulate the syscall. Public interface for calling through funcPtr.
95 void doSyscall(int callnum, Process *proc, ThreadContext *tc);
96};
97
98
99class BaseBufferArg {
100
101 public:
102
103 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
104 {
105 bufPtr = new uint8_t[size];
106 // clear out buffer: in case we only partially populate this,
107 // and then do a copyOut(), we want to make sure we don't
108 // introduce any random junk into the simulated address space
109 memset(bufPtr, 0, size);
110 }
111
112 virtual ~BaseBufferArg() { delete [] bufPtr; }
113
114 //
115 // copy data into simulator space (read from target memory)
116 //
117 virtual bool copyIn(TranslatingPort *memport)
118 {
119 memport->readBlob(addr, bufPtr, size);
120 return true; // no EFAULT detection for now
121 }
122
123 //
124 // copy data out of simulator space (write to target memory)
125 //
126 virtual bool copyOut(TranslatingPort *memport)
127 {
128 memport->writeBlob(addr, bufPtr, size);
129 return true; // no EFAULT detection for now
130 }
131
132 protected:
133 Addr addr;
134 int size;
135 uint8_t *bufPtr;
136};
137
138
139class BufferArg : public BaseBufferArg
140{
141 public:
142 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
143 void *bufferPtr() { return bufPtr; }
144};
145
146template <class T>
147class TypedBufferArg : public BaseBufferArg
148{
149 public:
150 // user can optionally specify a specific number of bytes to
151 // allocate to deal with those structs that have variable-size
152 // arrays at the end
153 TypedBufferArg(Addr _addr, int _size = sizeof(T))
154 : BaseBufferArg(_addr, _size)
155 { }
156
157 // type case
158 operator T*() { return (T *)bufPtr; }
159
160 // dereference operators
161 T &operator*() { return *((T *)bufPtr); }
162 T* operator->() { return (T *)bufPtr; }
163 T &operator[](int i) { return ((T *)bufPtr)[i]; }
164};
165
166//////////////////////////////////////////////////////////////////////
167//
168// The following emulation functions are generic enough that they
169// don't need to be recompiled for different emulated OS's. They are
170// defined in sim/syscall_emul.cc.
171//
172//////////////////////////////////////////////////////////////////////
173
174
175/// Handler for unimplemented syscalls that we haven't thought about.
176SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
177 Process *p, ThreadContext *tc);
178
179/// Handler for unimplemented syscalls that we never intend to
180/// implement (signal handling, etc.) and should not affect the correct
181/// behavior of the program. Print a warning only if the appropriate
182/// trace flag is enabled. Return success to the target program.
183SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
184 Process *p, ThreadContext *tc);
185
186/// Target exit() handler: terminate simulation.
187SyscallReturn exitFunc(SyscallDesc *desc, int num,
188 Process *p, ThreadContext *tc);
189
190/// Target getpagesize() handler.
191SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
192 Process *p, ThreadContext *tc);
193
194/// Target obreak() handler: set brk address.
195SyscallReturn obreakFunc(SyscallDesc *desc, int num,
196 Process *p, ThreadContext *tc);
197
198/// Target close() handler.
199SyscallReturn closeFunc(SyscallDesc *desc, int num,
200 Process *p, ThreadContext *tc);
201
202/// Target read() handler.
203SyscallReturn readFunc(SyscallDesc *desc, int num,
204 Process *p, ThreadContext *tc);
205
206/// Target write() handler.
207SyscallReturn writeFunc(SyscallDesc *desc, int num,
208 Process *p, ThreadContext *tc);
209
210/// Target lseek() handler.
211SyscallReturn lseekFunc(SyscallDesc *desc, int num,
212 Process *p, ThreadContext *tc);
213
214/// Target munmap() handler.
215SyscallReturn munmapFunc(SyscallDesc *desc, int num,
216 Process *p, ThreadContext *tc);
217
218/// Target gethostname() handler.
219SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
220 Process *p, ThreadContext *tc);
221
222/// Target unlink() handler.
223SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
224 Process *p, ThreadContext *tc);
225
226/// Target rename() handler.
227SyscallReturn renameFunc(SyscallDesc *desc, int num,
228 Process *p, ThreadContext *tc);
229
230
231/// Target truncate() handler.
232SyscallReturn truncateFunc(SyscallDesc *desc, int num,
233 Process *p, ThreadContext *tc);
234
235
236/// Target ftruncate() handler.
237SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
238 Process *p, ThreadContext *tc);
239
240
241/// Target chown() handler.
242SyscallReturn chownFunc(SyscallDesc *desc, int num,
243 Process *p, ThreadContext *tc);
244
245
246/// Target fchown() handler.
247SyscallReturn fchownFunc(SyscallDesc *desc, int num,
248 Process *p, ThreadContext *tc);
249
250/// Target dup() handler.
251SyscallReturn dupFunc(SyscallDesc *desc, int num,
252 Process *process, ThreadContext *tc);
253
254/// Target fnctl() handler.
255SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
256 Process *process, ThreadContext *tc);
257
258/// Target fcntl64() handler.
259SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
260 Process *process, ThreadContext *tc);
261
262/// Target setuid() handler.
263SyscallReturn setuidFunc(SyscallDesc *desc, int num,
264 Process *p, ThreadContext *tc);
265
266/// Target getpid() handler.
267SyscallReturn getpidFunc(SyscallDesc *desc, int num,
268 Process *p, ThreadContext *tc);
269
270/// Target getuid() handler.
271SyscallReturn getuidFunc(SyscallDesc *desc, int num,
272 Process *p, ThreadContext *tc);
273
274/// Target getgid() handler.
275SyscallReturn getgidFunc(SyscallDesc *desc, int num,
276 Process *p, ThreadContext *tc);
277
278/// Target getppid() handler.
279SyscallReturn getppidFunc(SyscallDesc *desc, int num,
280 Process *p, ThreadContext *tc);
281
282/// Target geteuid() handler.
283SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
284 Process *p, ThreadContext *tc);
285
286/// Target getegid() handler.
287SyscallReturn getegidFunc(SyscallDesc *desc, int num,
288 Process *p, ThreadContext *tc);
289
290
291
292/// Pseudo Funcs - These functions use a different return convension,
293/// returning a second value in a register other than the normal return register
294SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
295 Process *process, ThreadContext *tc);
296
297/// Target getpidPseudo() handler.
298SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
299 Process *p, ThreadContext *tc);
300
301/// Target getuidPseudo() handler.
302SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
303 Process *p, ThreadContext *tc);
304
305/// Target getgidPseudo() handler.
306SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
307 Process *p, ThreadContext *tc);
308
309
310/// A readable name for 1,000,000, for converting microseconds to seconds.
311const int one_million = 1000000;
312
313/// Approximate seconds since the epoch (1/1/1970). About a billion,
314/// by my reckoning. We want to keep this a constant (not use the
315/// real-world time) to keep simulations repeatable.
316const unsigned seconds_since_epoch = 1000000000;
317
318/// Helper function to convert current elapsed time to seconds and
319/// microseconds.
320template <class T1, class T2>
321void
322getElapsedTime(T1 &sec, T2 &usec)
323{
324 int elapsed_usecs = curTick / Clock::Int::us;
325 sec = elapsed_usecs / one_million;
326 usec = elapsed_usecs % one_million;
327}
328
329//////////////////////////////////////////////////////////////////////
330//
331// The following emulation functions are generic, but need to be
332// templated to account for differences in types, constants, etc.
333//
334//////////////////////////////////////////////////////////////////////
335
336#if NO_STAT64
337 typedef struct stat hst_stat;
338 typedef struct stat hst_stat64;
339#else
340 typedef struct stat hst_stat;
341 typedef struct stat64 hst_stat64;
342#endif
343
344//// Helper function to convert a host stat buffer to a target stat
345//// buffer. Also copies the target buffer out to the simulated
346//// memory space. Used by stat(), fstat(), and lstat().
347
348template <typename target_stat, typename host_stat>
349static void
350convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
351{
352 if (fakeTTY)
353 tgt->st_dev = 0xA;
354 else
355 tgt->st_dev = host->st_dev;
356 tgt->st_dev = htog(tgt->st_dev);
357 tgt->st_ino = host->st_ino;
358 tgt->st_ino = htog(tgt->st_ino);
359 if (fakeTTY)
360 tgt->st_rdev = 0x880d;
361 else
362 tgt->st_rdev = host->st_rdev;
363 tgt->st_rdev = htog(tgt->st_rdev);
364 tgt->st_size = host->st_size;
365 tgt->st_size = htog(tgt->st_size);
366 tgt->st_atimeX = host->st_atimeX;
367 tgt->st_atimeX = htog(tgt->st_atimeX);
368 tgt->st_mtimeX = host->st_mtimeX;
369 tgt->st_mtimeX = htog(tgt->st_mtimeX);
370 tgt->st_ctimeX = host->st_ctimeX;
371 tgt->st_ctimeX = htog(tgt->st_ctimeX);
372 tgt->st_blksize = host->st_blksize;
373 tgt->st_blksize = htog(tgt->st_blksize);
374 tgt->st_blocks = host->st_blocks;
375 tgt->st_blocks = htog(tgt->st_blocks);
376}
377
378// Same for stat64
379
380template <typename target_stat, typename host_stat64>
381static void
382convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
383{
384 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
385#if defined(STAT_HAVE_NSEC)
386 tgt->st_atime_nsec = host->st_atime_nsec;
387 tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
388 tgt->st_mtime_nsec = host->st_mtime_nsec;
389 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
390 tgt->st_ctime_nsec = host->st_ctime_nsec;
391 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
392#else
393 tgt->st_atime_nsec = 0;
394 tgt->st_mtime_nsec = 0;
395 tgt->st_ctime_nsec = 0;
396#endif
397}
398
399//Here are a couple convenience functions
400template<class OS>
401static void
402copyOutStatBuf(TranslatingPort * mem, Addr addr,
403 hst_stat *host, bool fakeTTY = false)
404{
405 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
406 tgt_stat_buf tgt(addr);
407 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
408 tgt.copyOut(mem);
409}
410
411template<class OS>
412static void
413copyOutStat64Buf(TranslatingPort * mem, Addr addr,
414 hst_stat64 *host, bool fakeTTY = false)
415{
416 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
417 tgt_stat_buf tgt(addr);
418 convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
419 tgt.copyOut(mem);
420}
421
422/// Target ioctl() handler. For the most part, programs call ioctl()
423/// only to find out if their stdout is a tty, to determine whether to
424/// do line or block buffering.
425template <class OS>
426SyscallReturn
427ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
428 ThreadContext *tc)
429{
430 int fd = tc->getSyscallArg(0);
431 unsigned req = tc->getSyscallArg(1);
432
433 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
434
435 if (fd < 0 || process->sim_fd(fd) < 0) {
436 // doesn't map to any simulator fd: not a valid target fd
437 return -EBADF;
438 }
439
440 switch (req) {
441 case OS::TIOCISATTY:
442 case OS::TIOCGETP:
443 case OS::TIOCSETP:
444 case OS::TIOCSETN:
445 case OS::TIOCSETC:
446 case OS::TIOCGETC:
447 case OS::TIOCGETS:
448 case OS::TIOCGETA:
449 return -ENOTTY;
450
451 default:
452 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
453 fd, req, tc->readPC());
454 }
455}
456
457/// Target open() handler.
458template <class OS>
459SyscallReturn
460openFunc(SyscallDesc *desc, int callnum, Process *process,
461 ThreadContext *tc)
462{
463 std::string path;
464
465 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
466 return -EFAULT;
467
468 if (path == "/dev/sysdev0") {
469 // This is a memory-mapped high-resolution timer device on Alpha.
470 // We don't support it, so just punt.
471 warn("Ignoring open(%s, ...)\n", path);
472 return -ENOENT;
473 }
474
475 int tgtFlags = tc->getSyscallArg(1);
476 int mode = tc->getSyscallArg(2);
477 int hostFlags = 0;
478
479 // translate open flags
480 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
481 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
482 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
483 hostFlags |= OS::openFlagTable[i].hostFlag;
484 }
485 }
486
487 // any target flags left?
488 if (tgtFlags != 0)
489 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
490
491#ifdef __CYGWIN32__
492 hostFlags |= O_BINARY;
493#endif
494
495 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
496
497 // open the file
498 int fd = open(path.c_str(), hostFlags, mode);
499
500 return (fd == -1) ? -errno : process->alloc_fd(fd);
501}
502
503
504/// Target chmod() handler.
505template <class OS>
506SyscallReturn
507chmodFunc(SyscallDesc *desc, int callnum, Process *process,
508 ThreadContext *tc)
509{
510 std::string path;
511
512 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
513 return -EFAULT;
514
515 uint32_t mode = tc->getSyscallArg(1);
516 mode_t hostMode = 0;
517
518 // XXX translate mode flags via OS::something???
519 hostMode = mode;
520
521 // do the chmod
522 int result = chmod(path.c_str(), hostMode);
523 if (result < 0)
524 return -errno;
525
526 return 0;
527}
528
529
530/// Target fchmod() handler.
531template <class OS>
532SyscallReturn
533fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
534 ThreadContext *tc)
535{
536 int fd = tc->getSyscallArg(0);
537 if (fd < 0 || process->sim_fd(fd) < 0) {
538 // doesn't map to any simulator fd: not a valid target fd
539 return -EBADF;
540 }
541
542 uint32_t mode = tc->getSyscallArg(1);
543 mode_t hostMode = 0;
544
545 // XXX translate mode flags via OS::someting???
546 hostMode = mode;
547
548 // do the fchmod
549 int result = fchmod(process->sim_fd(fd), hostMode);
550 if (result < 0)
551 return -errno;
552
553 return 0;
554}
555
556
557/// Target stat() handler.
558template <class OS>
559SyscallReturn
560statFunc(SyscallDesc *desc, int callnum, Process *process,
561 ThreadContext *tc)
562{
563 std::string path;
564
565 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
566 return -EFAULT;
567
568 struct stat hostBuf;
569 int result = stat(path.c_str(), &hostBuf);
570
571 if (result < 0)
572 return -errno;
573
574 copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
575
576 return 0;
577}
578
579
580/// Target fstat64() handler.
581template <class OS>
582SyscallReturn
583fstat64Func(SyscallDesc *desc, int callnum, Process *process,
584 ThreadContext *tc)
585{
586 int fd = tc->getSyscallArg(0);
587 if (fd < 0 || process->sim_fd(fd) < 0) {
588 // doesn't map to any simulator fd: not a valid target fd
589 return -EBADF;
590 }
591
592#if NO_STAT64
593 struct stat hostBuf;
594 int result = fstat(process->sim_fd(fd), &hostBuf);
595#else
596 struct stat64 hostBuf;
597 int result = fstat64(process->sim_fd(fd), &hostBuf);
598#endif
599
600 if (result < 0)
601 return -errno;
602
603 copyOutStat64Buf<OS>(tc->getMemPort(), fd, tc->getSyscallArg(1), &hostBuf);
604
605 return 0;
606}
607
608
609/// Target lstat() handler.
610template <class OS>
611SyscallReturn
612lstatFunc(SyscallDesc *desc, int callnum, Process *process,
613 ThreadContext *tc)
614{
615 std::string path;
616
617 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
618 return -EFAULT;
619
620 struct stat hostBuf;
621 int result = lstat(path.c_str(), &hostBuf);
622
623 if (result < 0)
624 return -errno;
625
626 copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
627
628 return 0;
629}
630
631/// Target lstat64() handler.
632template <class OS>
633SyscallReturn
634lstat64Func(SyscallDesc *desc, int callnum, Process *process,
635 ThreadContext *tc)
636{
637 std::string path;
638
639 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
640 return -EFAULT;
641
642#if NO_STAT64
643 struct stat hostBuf;
644 int result = lstat(path.c_str(), &hostBuf);
645#else
646 struct stat64 hostBuf;
647 int result = lstat64(path.c_str(), &hostBuf);
648#endif
649
650 if (result < 0)
651 return -errno;
652
653 copyOutStat64Buf<OS>(tc->getMemPort(), -1, tc->getSyscallArg(1), &hostBuf);
654
655 return 0;
656}
657
658/// Target fstat() handler.
659template <class OS>
660SyscallReturn
661fstatFunc(SyscallDesc *desc, int callnum, Process *process,
662 ThreadContext *tc)
663{
664 int fd = process->sim_fd(tc->getSyscallArg(0));
665
666 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
667
668 if (fd < 0)
669 return -EBADF;
670
671 struct stat hostBuf;
672 int result = fstat(fd, &hostBuf);
673
674 if (result < 0)
675 return -errno;
676
677 copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
678
679 return 0;
680}
681
682
683/// Target statfs() handler.
684template <class OS>
685SyscallReturn
686statfsFunc(SyscallDesc *desc, int callnum, Process *process,
687 ThreadContext *tc)
688{
689 std::string path;
690
691 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
692 return -EFAULT;
693
694 struct statfs hostBuf;
695 int result = statfs(path.c_str(), &hostBuf);
696
697 if (result < 0)
698 return -errno;
699
700 copyOutStatfsBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
701
702 return 0;
703}
704
705
706/// Target fstatfs() handler.
707template <class OS>
708SyscallReturn
709fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
710 ThreadContext *tc)
711{
712 int fd = process->sim_fd(tc->getSyscallArg(0));
713
714 if (fd < 0)
715 return -EBADF;
716
717 struct statfs hostBuf;
718 int result = fstatfs(fd, &hostBuf);
719
720 if (result < 0)
721 return -errno;
722
723 copyOutStatfsBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
724
725 return 0;
726}
727
728
729/// Target writev() handler.
730template <class OS>
731SyscallReturn
732writevFunc(SyscallDesc *desc, int callnum, Process *process,
733 ThreadContext *tc)
734{
735 int fd = tc->getSyscallArg(0);
736 if (fd < 0 || process->sim_fd(fd) < 0) {
737 // doesn't map to any simulator fd: not a valid target fd
738 return -EBADF;
739 }
740
741 TranslatingPort *p = tc->getMemPort();
742 uint64_t tiov_base = tc->getSyscallArg(1);
743 size_t count = tc->getSyscallArg(2);
744 struct iovec hiov[count];
745 for (int i = 0; i < count; ++i)
746 {
747 typename OS::tgt_iovec tiov;
748
749 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
750 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
751 hiov[i].iov_len = gtoh(tiov.iov_len);
752 hiov[i].iov_base = new char [hiov[i].iov_len];
753 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
754 hiov[i].iov_len);
755 }
756
757 int result = writev(process->sim_fd(fd), hiov, count);
758
759 for (int i = 0; i < count; ++i)
760 {
761 delete [] (char *)hiov[i].iov_base;
762 }
763
764 if (result < 0)
765 return -errno;
766
767 return 0;
768}
769
770
771/// Target mmap() handler.
772///
773/// We don't really handle mmap(). If the target is mmaping an
774/// anonymous region or /dev/zero, we can get away with doing basically
775/// nothing (since memory is initialized to zero and the simulator
776/// doesn't really check addresses anyway). Always print a warning,
777/// since this could be seriously broken if we're not mapping
778/// /dev/zero.
779//
780/// Someday we should explicitly check for /dev/zero in open, flag the
781/// file descriptor, and fail (or implement!) a non-anonymous mmap to
782/// anything else.
783template <class OS>
784SyscallReturn
785mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
786{
787 Addr start = tc->getSyscallArg(0);
788 uint64_t length = tc->getSyscallArg(1);
789 // int prot = tc->getSyscallArg(2);
790 int flags = tc->getSyscallArg(3);
791 // int fd = p->sim_fd(tc->getSyscallArg(4));
792 // int offset = tc->getSyscallArg(5);
793
794 if ((start % TheISA::VMPageSize) != 0 ||
795 (length % TheISA::VMPageSize) != 0) {
796 warn("mmap failing: arguments not page-aligned: "
797 "start 0x%x length 0x%x",
798 start, length);
799 return -EINVAL;
800 }
801
802 if (start != 0) {
803 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
804 start, p->mmap_end);
805 }
806
807 // pick next address from our "mmap region"
808 start = p->mmap_end;
809 p->pTable->allocate(start, length);
810 p->mmap_end += length;
811
812 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
813 warn("allowing mmap of file @ fd %d. "
814 "This will break if not /dev/zero.", tc->getSyscallArg(4));
815 }
816
817 return start;
818}
819
820/// Target getrlimit() handler.
821template <class OS>
822SyscallReturn
823getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
824 ThreadContext *tc)
825{
826 unsigned resource = tc->getSyscallArg(0);
827 TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
828
829 switch (resource) {
830 case OS::TGT_RLIMIT_STACK:
831 // max stack size in bytes: make up a number (2MB for now)
832 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
833 rlp->rlim_cur = htog(rlp->rlim_cur);
834 rlp->rlim_max = htog(rlp->rlim_max);
835 break;
836
837 default:
838 std::cerr << "getrlimitFunc: unimplemented resource " << resource
839 << std::endl;
840 abort();
841 break;
842 }
843
844 rlp.copyOut(tc->getMemPort());
845 return 0;
846}
847
848/// Target gettimeofday() handler.
849template <class OS>
850SyscallReturn
851gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
852 ThreadContext *tc)
853{
854 TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
855
856 getElapsedTime(tp->tv_sec, tp->tv_usec);
857 tp->tv_sec += seconds_since_epoch;
858 tp->tv_sec = htog(tp->tv_sec);
859 tp->tv_usec = htog(tp->tv_usec);
860
861 tp.copyOut(tc->getMemPort());
862
863 return 0;
864}
865
866
867/// Target utimes() handler.
868template <class OS>
869SyscallReturn
870utimesFunc(SyscallDesc *desc, int callnum, Process *process,
871 ThreadContext *tc)
872{
873 std::string path;
874
875 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
876 return -EFAULT;
877
878 TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
879 tp.copyIn(tc->getMemPort());
880
881 struct timeval hostTimeval[2];
882 for (int i = 0; i < 2; ++i)
883 {
884 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
885 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
886 }
887 int result = utimes(path.c_str(), hostTimeval);
888
889 if (result < 0)
890 return -errno;
891
892 return 0;
893}
894/// Target getrusage() function.
895template <class OS>
896SyscallReturn
897getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
898 ThreadContext *tc)
899{
900 int who = tc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
901 TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
902
903 if (who != OS::TGT_RUSAGE_SELF) {
904 // don't really handle THREAD or CHILDREN, but just warn and
905 // plow ahead
906 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
907 who);
908 }
909
910 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
911 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
912 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
913
914 rup->ru_stime.tv_sec = 0;
915 rup->ru_stime.tv_usec = 0;
916 rup->ru_maxrss = 0;
917 rup->ru_ixrss = 0;
918 rup->ru_idrss = 0;
919 rup->ru_isrss = 0;
920 rup->ru_minflt = 0;
921 rup->ru_majflt = 0;
922 rup->ru_nswap = 0;
923 rup->ru_inblock = 0;
924 rup->ru_oublock = 0;
925 rup->ru_msgsnd = 0;
926 rup->ru_msgrcv = 0;
927 rup->ru_nsignals = 0;
928 rup->ru_nvcsw = 0;
929 rup->ru_nivcsw = 0;
930
931 rup.copyOut(tc->getMemPort());
932
933 return 0;
934}
935
936
937
938
939#endif // __SIM_SYSCALL_EMUL_HH__