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 LiveProcess *, 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, LiveProcess *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 LiveProcess *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 LiveProcess *p, ThreadContext *tc);
185
186/// Target exit() handler: terminate simulation.
187SyscallReturn exitFunc(SyscallDesc *desc, int num,
188 LiveProcess *p, ThreadContext *tc);
189
190/// Target getpagesize() handler.
191SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
192 LiveProcess *p, ThreadContext *tc);
193
194/// Target obreak() handler: set brk address.
195SyscallReturn obreakFunc(SyscallDesc *desc, int num,
196 LiveProcess *p, ThreadContext *tc);
197
198/// Target close() handler.
199SyscallReturn closeFunc(SyscallDesc *desc, int num,
200 LiveProcess *p, ThreadContext *tc);
201
202/// Target read() handler.
203SyscallReturn readFunc(SyscallDesc *desc, int num,
204 LiveProcess *p, ThreadContext *tc);
205
206/// Target write() handler.
207SyscallReturn writeFunc(SyscallDesc *desc, int num,
208 LiveProcess *p, ThreadContext *tc);
209
210/// Target lseek() handler.
211SyscallReturn lseekFunc(SyscallDesc *desc, int num,
212 LiveProcess *p, ThreadContext *tc);
213
214/// Target _llseek() handler.
215SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
216 LiveProcess *p, ThreadContext *tc);
217
218/// Target munmap() handler.
219SyscallReturn munmapFunc(SyscallDesc *desc, int num,
220 LiveProcess *p, ThreadContext *tc);
221
222/// Target gethostname() handler.
223SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
224 LiveProcess *p, ThreadContext *tc);
225
226/// Target getcwd() handler.
227SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
228 LiveProcess *p, ThreadContext *tc);
229
230/// Target unlink() handler.
231SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
232 LiveProcess *p, ThreadContext *tc);
233
234/// Target unlink() handler.
235SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
236 LiveProcess *p, ThreadContext *tc);
237
238/// Target mkdir() handler.
239SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
240 LiveProcess *p, ThreadContext *tc);
241
242/// Target rename() handler.
243SyscallReturn renameFunc(SyscallDesc *desc, int num,
244 LiveProcess *p, ThreadContext *tc);
245
246
247/// Target truncate() handler.
248SyscallReturn truncateFunc(SyscallDesc *desc, int num,
249 LiveProcess *p, ThreadContext *tc);
250
251
252/// Target ftruncate() handler.
253SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
254 LiveProcess *p, ThreadContext *tc);
255
256
257/// Target umask() handler.
258SyscallReturn umaskFunc(SyscallDesc *desc, int num,
259 LiveProcess *p, ThreadContext *tc);
260
261
262/// Target chown() handler.
263SyscallReturn chownFunc(SyscallDesc *desc, int num,
264 LiveProcess *p, ThreadContext *tc);
265
266
267/// Target fchown() handler.
268SyscallReturn fchownFunc(SyscallDesc *desc, int num,
269 LiveProcess *p, ThreadContext *tc);
270
271/// Target dup() handler.
272SyscallReturn dupFunc(SyscallDesc *desc, int num,
273 LiveProcess *process, ThreadContext *tc);
274
275/// Target fnctl() handler.
276SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
277 LiveProcess *process, ThreadContext *tc);
278
279/// Target fcntl64() handler.
280SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
281 LiveProcess *process, ThreadContext *tc);
282
283/// Target setuid() handler.
284SyscallReturn setuidFunc(SyscallDesc *desc, int num,
285 LiveProcess *p, ThreadContext *tc);
286
287/// Target getpid() handler.
288SyscallReturn getpidFunc(SyscallDesc *desc, int num,
289 LiveProcess *p, ThreadContext *tc);
290
291/// Target getuid() handler.
292SyscallReturn getuidFunc(SyscallDesc *desc, int num,
293 LiveProcess *p, ThreadContext *tc);
294
295/// Target getgid() handler.
296SyscallReturn getgidFunc(SyscallDesc *desc, int num,
297 LiveProcess *p, ThreadContext *tc);
298
299/// Target getppid() handler.
300SyscallReturn getppidFunc(SyscallDesc *desc, int num,
301 LiveProcess *p, ThreadContext *tc);
302
303/// Target geteuid() handler.
304SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
305 LiveProcess *p, ThreadContext *tc);
306
307/// Target getegid() handler.
308SyscallReturn getegidFunc(SyscallDesc *desc, int num,
309 LiveProcess *p, ThreadContext *tc);
310
311
312
313/// Pseudo Funcs - These functions use a different return convension,
314/// returning a second value in a register other than the normal return register
315SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
316 LiveProcess *process, ThreadContext *tc);
317
318/// Target getpidPseudo() handler.
319SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
320 LiveProcess *p, ThreadContext *tc);
321
322/// Target getuidPseudo() handler.
323SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
324 LiveProcess *p, ThreadContext *tc);
325
326/// Target getgidPseudo() handler.
327SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
328 LiveProcess *p, ThreadContext *tc);
329
330
331/// A readable name for 1,000,000, for converting microseconds to seconds.
332const int one_million = 1000000;
333
334/// Approximate seconds since the epoch (1/1/1970). About a billion,
335/// by my reckoning. We want to keep this a constant (not use the
336/// real-world time) to keep simulations repeatable.
337const unsigned seconds_since_epoch = 1000000000;
338
339/// Helper function to convert current elapsed time to seconds and
340/// microseconds.
341template <class T1, class T2>
342void
343getElapsedTime(T1 &sec, T2 &usec)
344{
345 int elapsed_usecs = curTick / Clock::Int::us;
346 sec = elapsed_usecs / one_million;
347 usec = elapsed_usecs % one_million;
348}
349
350//////////////////////////////////////////////////////////////////////
351//
352// The following emulation functions are generic, but need to be
353// templated to account for differences in types, constants, etc.
354//
355//////////////////////////////////////////////////////////////////////
356
357#if NO_STAT64
358 typedef struct stat hst_stat;
359 typedef struct stat hst_stat64;
360#else
361 typedef struct stat hst_stat;
362 typedef struct stat64 hst_stat64;
363#endif
364
365//// Helper function to convert a host stat buffer to a target stat
366//// buffer. Also copies the target buffer out to the simulated
367//// memory space. Used by stat(), fstat(), and lstat().
368
369template <typename target_stat, typename host_stat>
370static void
371convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
372{
373 using namespace TheISA;
374
375 if (fakeTTY)
376 tgt->st_dev = 0xA;
377 else
378 tgt->st_dev = host->st_dev;
379 tgt->st_dev = htog(tgt->st_dev);
380 tgt->st_ino = host->st_ino;
381 tgt->st_ino = htog(tgt->st_ino);
382 tgt->st_mode = host->st_mode;
383 tgt->st_mode = htog(tgt->st_mode);
384 tgt->st_nlink = host->st_nlink;
385 tgt->st_nlink = htog(tgt->st_nlink);
386 tgt->st_uid = host->st_uid;
387 tgt->st_uid = htog(tgt->st_uid);
388 tgt->st_gid = host->st_gid;
389 tgt->st_gid = htog(tgt->st_gid);
390 if (fakeTTY)
391 tgt->st_rdev = 0x880d;
392 else
393 tgt->st_rdev = host->st_rdev;
394 tgt->st_rdev = htog(tgt->st_rdev);
395 tgt->st_size = host->st_size;
396 tgt->st_size = htog(tgt->st_size);
397 tgt->st_atimeX = host->st_atime;
398 tgt->st_atimeX = htog(tgt->st_atimeX);
399 tgt->st_mtimeX = host->st_mtime;
400 tgt->st_mtimeX = htog(tgt->st_mtimeX);
401 tgt->st_ctimeX = host->st_ctime;
402 tgt->st_ctimeX = htog(tgt->st_ctimeX);
403 // Force the block size to be 8k. This helps to ensure buffered io works
404 // consistently across different hosts.
405 tgt->st_blksize = 0x2000;
406 tgt->st_blksize = htog(tgt->st_blksize);
407 tgt->st_blocks = host->st_blocks;
408 tgt->st_blocks = htog(tgt->st_blocks);
409}
410
411// Same for stat64
412
413template <typename target_stat, typename host_stat64>
414static void
415convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
416{
417 using namespace TheISA;
418
419 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
420#if defined(STAT_HAVE_NSEC)
421 tgt->st_atime_nsec = host->st_atime_nsec;
422 tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
423 tgt->st_mtime_nsec = host->st_mtime_nsec;
424 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
425 tgt->st_ctime_nsec = host->st_ctime_nsec;
426 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
427#else
428 tgt->st_atime_nsec = 0;
429 tgt->st_mtime_nsec = 0;
430 tgt->st_ctime_nsec = 0;
431#endif
432}
433
434//Here are a couple convenience functions
435template<class OS>
436static void
437copyOutStatBuf(TranslatingPort * mem, Addr addr,
438 hst_stat *host, bool fakeTTY = false)
439{
440 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
441 tgt_stat_buf tgt(addr);
442 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
443 tgt.copyOut(mem);
444}
445
446template<class OS>
447static void
448copyOutStat64Buf(TranslatingPort * mem, Addr addr,
449 hst_stat64 *host, bool fakeTTY = false)
450{
451 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
452 tgt_stat_buf tgt(addr);
453 convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
454 tgt.copyOut(mem);
455}
456
457/// Target ioctl() handler. For the most part, programs call ioctl()
458/// only to find out if their stdout is a tty, to determine whether to
459/// do line or block buffering.
460template <class OS>
461SyscallReturn
462ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
463 ThreadContext *tc)
464{
465 int fd = tc->getSyscallArg(0);
466 unsigned req = tc->getSyscallArg(1);
467
468 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
469
470 if (fd < 0 || process->sim_fd(fd) < 0) {
471 // doesn't map to any simulator fd: not a valid target fd
472 return -EBADF;
473 }
474
475 switch (req) {
476 case OS::TIOCISATTY_:
477 case OS::TIOCGETP_:
478 case OS::TIOCSETP_:
479 case OS::TIOCSETN_:
480 case OS::TIOCSETC_:
481 case OS::TIOCGETC_:
482 case OS::TIOCGETS_:
483 case OS::TIOCGETA_:
484 return -ENOTTY;
485
486 default:
487 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
488 fd, req, tc->readPC());
489 }
490}
491
492/// Target open() handler.
493template <class OS>
494SyscallReturn
495openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
496 ThreadContext *tc)
497{
498 std::string path;
499
500 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
501 return -EFAULT;
502
503 if (path == "/dev/sysdev0") {
504 // This is a memory-mapped high-resolution timer device on Alpha.
505 // We don't support it, so just punt.
506 warn("Ignoring open(%s, ...)\n", path);
507 return -ENOENT;
508 }
509
510 int tgtFlags = tc->getSyscallArg(1);
511 int mode = tc->getSyscallArg(2);
512 int hostFlags = 0;
513
514 // translate open flags
515 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
516 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
517 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
518 hostFlags |= OS::openFlagTable[i].hostFlag;
519 }
520 }
521
522 // any target flags left?
523 if (tgtFlags != 0)
524 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
525
526#ifdef __CYGWIN32__
527 hostFlags |= O_BINARY;
528#endif
529
530 // Adjust path for current working directory
531 path = process->fullPath(path);
532
533 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
534
535 // open the file
536 int fd = open(path.c_str(), hostFlags, mode);
537
538 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
539}
540
541
542/// Target chmod() handler.
543template <class OS>
544SyscallReturn
545chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
546 ThreadContext *tc)
547{
548 std::string path;
549
550 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
551 return -EFAULT;
552
553 uint32_t mode = tc->getSyscallArg(1);
554 mode_t hostMode = 0;
555
556 // XXX translate mode flags via OS::something???
557 hostMode = mode;
558
559 // Adjust path for current working directory
560 path = process->fullPath(path);
561
562 // do the chmod
563 int result = chmod(path.c_str(), hostMode);
564 if (result < 0)
565 return -errno;
566
567 return 0;
568}
569
570
571/// Target fchmod() handler.
572template <class OS>
573SyscallReturn
574fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
575 ThreadContext *tc)
576{
577 int fd = tc->getSyscallArg(0);
578 if (fd < 0 || process->sim_fd(fd) < 0) {
579 // doesn't map to any simulator fd: not a valid target fd
580 return -EBADF;
581 }
582
583 uint32_t mode = tc->getSyscallArg(1);
584 mode_t hostMode = 0;
585
586 // XXX translate mode flags via OS::someting???
587 hostMode = mode;
588
589 // do the fchmod
590 int result = fchmod(process->sim_fd(fd), hostMode);
591 if (result < 0)
592 return -errno;
593
594 return 0;
595}
596
597
598/// Target stat() handler.
599template <class OS>
600SyscallReturn
601statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
602 ThreadContext *tc)
603{
604 std::string path;
605
606 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
607 return -EFAULT;
608
609 // Adjust path for current working directory
610 path = process->fullPath(path);
611
612 struct stat hostBuf;
613 int result = stat(path.c_str(), &hostBuf);
614
615 if (result < 0)
616 return -errno;
617
618 copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
619
620 return 0;
621}
622
623
624/// Target stat64() handler.
625template <class OS>
626SyscallReturn
627stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
628 ThreadContext *tc)
629{
630 std::string path;
631
632 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
633 return -EFAULT;
634
635 // Adjust path for current working directory
636 path = process->fullPath(path);
637
638#if NO_STAT64
639 struct stat hostBuf;
640 int result = stat(path.c_str(), &hostBuf);
641#else
642 struct stat64 hostBuf;
643 int result = stat64(path.c_str(), &hostBuf);
644#endif
645
646 if (result < 0)
647 return -errno;
648
649 copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
650
651 return 0;
652}
653
654
655/// Target fstat64() handler.
656template <class OS>
657SyscallReturn
658fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
659 ThreadContext *tc)
660{
661 int fd = tc->getSyscallArg(0);
662 if (fd < 0 || process->sim_fd(fd) < 0) {
663 // doesn't map to any simulator fd: not a valid target fd
664 return -EBADF;
665 }
666
667#if NO_STAT64
668 struct stat hostBuf;
669 int result = fstat(process->sim_fd(fd), &hostBuf);
670#else
671 struct stat64 hostBuf;
672 int result = fstat64(process->sim_fd(fd), &hostBuf);
673#endif
674
675 if (result < 0)
676 return -errno;
677
678 copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
679 &hostBuf, (fd == 1));
680
681 return 0;
682}
683
684
685/// Target lstat() handler.
686template <class OS>
687SyscallReturn
688lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
689 ThreadContext *tc)
690{
691 std::string path;
692
693 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
694 return -EFAULT;
695
696 // Adjust path for current working directory
697 path = process->fullPath(path);
698
699 struct stat hostBuf;
700 int result = lstat(path.c_str(), &hostBuf);
701
702 if (result < 0)
703 return -errno;
704
705 copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
706
707 return 0;
708}
709
710/// Target lstat64() handler.
711template <class OS>
712SyscallReturn
713lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
714 ThreadContext *tc)
715{
716 std::string path;
717
718 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
719 return -EFAULT;
720
721 // Adjust path for current working directory
722 path = process->fullPath(path);
723
724#if NO_STAT64
725 struct stat hostBuf;
726 int result = lstat(path.c_str(), &hostBuf);
727#else
728 struct stat64 hostBuf;
729 int result = lstat64(path.c_str(), &hostBuf);
730#endif
731
732 if (result < 0)
733 return -errno;
734
735 copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
736
737 return 0;
738}
739
740/// Target fstat() handler.
741template <class OS>
742SyscallReturn
743fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
744 ThreadContext *tc)
745{
746 int fd = process->sim_fd(tc->getSyscallArg(0));
747
748 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
749
750 if (fd < 0)
751 return -EBADF;
752
753 struct stat hostBuf;
754 int result = fstat(fd, &hostBuf);
755
756 if (result < 0)
757 return -errno;
758
759 copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
760 &hostBuf, (fd == 1));
761
762 return 0;
763}
764
765
766/// Target statfs() handler.
767template <class OS>
768SyscallReturn
769statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
770 ThreadContext *tc)
771{
772 std::string path;
773
774 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
775 return -EFAULT;
776
777 // Adjust path for current working directory
778 path = process->fullPath(path);
779
780 struct statfs hostBuf;
781 int result = statfs(path.c_str(), &hostBuf);
782
783 if (result < 0)
784 return -errno;
785
786 OS::copyOutStatfsBuf(tc->getMemPort(),
787 (Addr)(tc->getSyscallArg(1)), &hostBuf);
788
789 return 0;
790}
791
792
793/// Target fstatfs() handler.
794template <class OS>
795SyscallReturn
796fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
797 ThreadContext *tc)
798{
799 int fd = process->sim_fd(tc->getSyscallArg(0));
800
801 if (fd < 0)
802 return -EBADF;
803
804 struct statfs hostBuf;
805 int result = fstatfs(fd, &hostBuf);
806
807 if (result < 0)
808 return -errno;
809
810 OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
811 &hostBuf);
812
813 return 0;
814}
815
816
817/// Target writev() handler.
818template <class OS>
819SyscallReturn
820writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
821 ThreadContext *tc)
822{
823 int fd = tc->getSyscallArg(0);
824 if (fd < 0 || process->sim_fd(fd) < 0) {
825 // doesn't map to any simulator fd: not a valid target fd
826 return -EBADF;
827 }
828
829 TranslatingPort *p = tc->getMemPort();
830 uint64_t tiov_base = tc->getSyscallArg(1);
831 size_t count = tc->getSyscallArg(2);
832 struct iovec hiov[count];
833 for (int i = 0; i < count; ++i)
834 {
835 typename OS::tgt_iovec tiov;
836
837 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
838 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
839 hiov[i].iov_len = gtoh(tiov.iov_len);
840 hiov[i].iov_base = new char [hiov[i].iov_len];
841 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
842 hiov[i].iov_len);
843 }
844
845 int result = writev(process->sim_fd(fd), hiov, count);
846
847 for (int i = 0; i < count; ++i)
848 {
849 delete [] (char *)hiov[i].iov_base;
850 }
851
852 if (result < 0)
853 return -errno;
854
855 return 0;
856}
857
858
859/// Target mmap() handler.
860///
861/// We don't really handle mmap(). If the target is mmaping an
862/// anonymous region or /dev/zero, we can get away with doing basically
863/// nothing (since memory is initialized to zero and the simulator
864/// doesn't really check addresses anyway). Always print a warning,
865/// since this could be seriously broken if we're not mapping
866/// /dev/zero.
867//
868/// Someday we should explicitly check for /dev/zero in open, flag the
869/// file descriptor, and fail (or implement!) a non-anonymous mmap to
870/// anything else.
871template <class OS>
872SyscallReturn
873mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
874{
875 Addr start = tc->getSyscallArg(0);
876 uint64_t length = tc->getSyscallArg(1);
877 // int prot = tc->getSyscallArg(2);
878 int flags = tc->getSyscallArg(3);
879 // int fd = p->sim_fd(tc->getSyscallArg(4));
880 // int offset = tc->getSyscallArg(5);
881
882 if ((start % TheISA::VMPageSize) != 0 ||
883 (length % TheISA::VMPageSize) != 0) {
884 warn("mmap failing: arguments not page-aligned: "
885 "start 0x%x length 0x%x",
886 start, length);
887 return -EINVAL;
888 }
889
890 if (start != 0) {
891 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
892 start, p->mmap_end);
893 }
894
895 // pick next address from our "mmap region"
896 start = p->mmap_end;
897 p->pTable->allocate(start, length);
898 p->mmap_end += length;
899
900 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
901 warn("allowing mmap of file @ fd %d. "
902 "This will break if not /dev/zero.", tc->getSyscallArg(4));
903 }
904
905 return start;
906}
907
908/// Target getrlimit() handler.
909template <class OS>
910SyscallReturn
911getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
912 ThreadContext *tc)
913{
914 unsigned resource = tc->getSyscallArg(0);
915 TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
916
917 switch (resource) {
918 case OS::TGT_RLIMIT_STACK:
919 // max stack size in bytes: make up a number (2MB for now)
920 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
921 rlp->rlim_cur = htog(rlp->rlim_cur);
922 rlp->rlim_max = htog(rlp->rlim_max);
923 break;
924
925 default:
926 std::cerr << "getrlimitFunc: unimplemented resource " << resource
927 << std::endl;
928 abort();
929 break;
930 }
931
932 rlp.copyOut(tc->getMemPort());
933 return 0;
934}
935
936/// Target gettimeofday() handler.
937template <class OS>
938SyscallReturn
939gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
940 ThreadContext *tc)
941{
942 TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
943
944 getElapsedTime(tp->tv_sec, tp->tv_usec);
945 tp->tv_sec += seconds_since_epoch;
946 tp->tv_sec = htog(tp->tv_sec);
947 tp->tv_usec = htog(tp->tv_usec);
948
949 tp.copyOut(tc->getMemPort());
950
951 return 0;
952}
953
954
955/// Target utimes() handler.
956template <class OS>
957SyscallReturn
958utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
959 ThreadContext *tc)
960{
961 std::string path;
962
963 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
964 return -EFAULT;
965
966 TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
967 tp.copyIn(tc->getMemPort());
968
969 struct timeval hostTimeval[2];
970 for (int i = 0; i < 2; ++i)
971 {
972 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
973 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
974 }
975
976 // Adjust path for current working directory
977 path = process->fullPath(path);
978
979 int result = utimes(path.c_str(), hostTimeval);
980
981 if (result < 0)
982 return -errno;
983
984 return 0;
985}
986/// Target getrusage() function.
987template <class OS>
988SyscallReturn
989getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
990 ThreadContext *tc)
991{
992 int who = tc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
993 TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
994
995 rup->ru_utime.tv_sec = 0;
996 rup->ru_utime.tv_usec = 0;
997 rup->ru_stime.tv_sec = 0;
998 rup->ru_stime.tv_usec = 0;
999 rup->ru_maxrss = 0;
1000 rup->ru_ixrss = 0;
1001 rup->ru_idrss = 0;
1002 rup->ru_isrss = 0;
1003 rup->ru_minflt = 0;
1004 rup->ru_majflt = 0;
1005 rup->ru_nswap = 0;
1006 rup->ru_inblock = 0;
1007 rup->ru_oublock = 0;
1008 rup->ru_msgsnd = 0;
1009 rup->ru_msgrcv = 0;
1010 rup->ru_nsignals = 0;
1011 rup->ru_nvcsw = 0;
1012 rup->ru_nivcsw = 0;
1013
1014 switch (who) {
1015 case OS::TGT_RUSAGE_SELF:
1016 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1017 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1018 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1019 break;
1020
1021 case OS::TGT_RUSAGE_CHILDREN:
1022 // do nothing. We have no child processes, so they take no time.
1023 break;
1024
1025 default:
1026 // don't really handle THREAD or CHILDREN, but just warn and
1027 // plow ahead
1028 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1029 who);
1030 }
1031
1032 rup.copyOut(tc->getMemPort());
1033
1034 return 0;
1035}
1036
1037
1038
1039
1040#endif // __SIM_SYSCALL_EMUL_HH__