1/*
2 * Copyright (c) 2012-2013, 2015 ARM Limited
3 * Copyright (c) 2015 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder. You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2003-2005 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Steve Reinhardt
42 * Kevin Lim
43 */
44
45#ifndef __SIM_SYSCALL_EMUL_HH__
46#define __SIM_SYSCALL_EMUL_HH__
47
48#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
49 defined(__FreeBSD__) || defined(__CYGWIN__) || \
50 defined(__NetBSD__))
51
52#define NO_STATFS (defined(__APPLE__) || defined(__OpenBSD__) || \
53 defined(__FreeBSD__) || defined(__NetBSD__))
54
55#define NO_FALLOCATE (defined(__APPLE__) || defined(__OpenBSD__) || \
56 defined(__FreeBSD__) || defined(__NetBSD__))
57
58///
59/// @file syscall_emul.hh
60///
61/// This file defines objects used to emulate syscalls from the target
62/// application on the host machine.
63
64#ifdef __CYGWIN32__
65#include <sys/fcntl.h>
66
67#endif
68#include <fcntl.h>
69#include <sys/mman.h>
70#include <sys/stat.h>
71#if (NO_STATFS == 0)
72#include <sys/statfs.h>
73#else
74#include <sys/mount.h>
75#endif
76#include <sys/time.h>
77#include <sys/uio.h>
78#include <unistd.h>
79
80#include <cerrno>
81#include <memory>
82#include <string>
83
84#include "arch/utility.hh"
85#include "base/intmath.hh"
86#include "base/loader/object_file.hh"
87#include "base/misc.hh"
88#include "base/trace.hh"
89#include "base/types.hh"
90#include "config/the_isa.hh"
91#include "cpu/base.hh"
92#include "cpu/thread_context.hh"
93#include "mem/page_table.hh"
94#include "params/Process.hh"
95#include "sim/emul_driver.hh"
96#include "sim/futex_map.hh"
97#include "sim/process.hh"
98#include "sim/syscall_debug_macros.hh"
99#include "sim/syscall_desc.hh"
100#include "sim/syscall_emul_buf.hh"
101#include "sim/syscall_return.hh"
102
103//////////////////////////////////////////////////////////////////////
104//
105// The following emulation functions are generic enough that they
106// don't need to be recompiled for different emulated OS's. They are
107// defined in sim/syscall_emul.cc.
108//
109//////////////////////////////////////////////////////////////////////
110
111
112/// Handler for unimplemented syscalls that we haven't thought about.
113SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
114 Process *p, ThreadContext *tc);
115
116/// Handler for unimplemented syscalls that we never intend to
117/// implement (signal handling, etc.) and should not affect the correct
118/// behavior of the program. Print a warning only if the appropriate
119/// trace flag is enabled. Return success to the target program.
120SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
121 Process *p, ThreadContext *tc);
122
123// Target fallocateFunc() handler.
124SyscallReturn fallocateFunc(SyscallDesc *desc, int num,
125 Process *p, ThreadContext *tc);
126
127/// Target exit() handler: terminate current context.
128SyscallReturn exitFunc(SyscallDesc *desc, int num,
129 Process *p, ThreadContext *tc);
130
131/// Target exit_group() handler: terminate simulation. (exit all threads)
132SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
133 Process *p, ThreadContext *tc);
134
135/// Target set_tid_address() handler.
136SyscallReturn setTidAddressFunc(SyscallDesc *desc, int num,
137 Process *p, ThreadContext *tc);
138
139/// Target getpagesize() handler.
140SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
141 Process *p, ThreadContext *tc);
142
143/// Target brk() handler: set brk address.
144SyscallReturn brkFunc(SyscallDesc *desc, int num,
145 Process *p, ThreadContext *tc);
146
147/// Target close() handler.
148SyscallReturn closeFunc(SyscallDesc *desc, int num,
149 Process *p, ThreadContext *tc);
150
151// Target read() handler.
152SyscallReturn readFunc(SyscallDesc *desc, int num,
153 Process *p, ThreadContext *tc);
154
155/// Target write() handler.
156SyscallReturn writeFunc(SyscallDesc *desc, int num,
157 Process *p, ThreadContext *tc);
158
159/// Target lseek() handler.
160SyscallReturn lseekFunc(SyscallDesc *desc, int num,
161 Process *p, ThreadContext *tc);
162
163/// Target _llseek() handler.
164SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
165 Process *p, ThreadContext *tc);
166
167/// Target munmap() handler.
168SyscallReturn munmapFunc(SyscallDesc *desc, int num,
169 Process *p, ThreadContext *tc);
170
171/// Target gethostname() handler.
172SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
173 Process *p, ThreadContext *tc);
174
175/// Target getcwd() handler.
176SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
177 Process *p, ThreadContext *tc);
178
179/// Target readlink() handler.
180SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
181 Process *p, ThreadContext *tc,
182 int index = 0);
183SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
184 Process *p, ThreadContext *tc);
185
186/// Target unlink() handler.
187SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
188 Process *p, ThreadContext *tc,
189 int index);
190SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
191 Process *p, ThreadContext *tc);
192
193/// Target mkdir() handler.
194SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
195 Process *p, ThreadContext *tc);
196
197/// Target rename() handler.
198SyscallReturn renameFunc(SyscallDesc *desc, int num,
199 Process *p, ThreadContext *tc);
200
201
202/// Target truncate() handler.
203SyscallReturn truncateFunc(SyscallDesc *desc, int num,
204 Process *p, ThreadContext *tc);
205
206
207/// Target ftruncate() handler.
208SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
209 Process *p, ThreadContext *tc);
210
211
212/// Target truncate64() handler.
213SyscallReturn truncate64Func(SyscallDesc *desc, int num,
214 Process *p, ThreadContext *tc);
215
216/// Target ftruncate64() handler.
217SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
218 Process *p, ThreadContext *tc);
219
220
221/// Target umask() handler.
222SyscallReturn umaskFunc(SyscallDesc *desc, int num,
223 Process *p, ThreadContext *tc);
224
225/// Target gettid() handler.
226SyscallReturn gettidFunc(SyscallDesc *desc, int num,
227 Process *p, ThreadContext *tc);
228
229/// Target chown() handler.
230SyscallReturn chownFunc(SyscallDesc *desc, int num,
231 Process *p, ThreadContext *tc);
232
233/// Target setpgid() handler.
234SyscallReturn setpgidFunc(SyscallDesc *desc, int num,
235 Process *p, ThreadContext *tc);
236
237/// Target fchown() handler.
238SyscallReturn fchownFunc(SyscallDesc *desc, int num,
239 Process *p, ThreadContext *tc);
240
241/// Target dup() handler.
242SyscallReturn dupFunc(SyscallDesc *desc, int num,
243 Process *process, ThreadContext *tc);
244
245/// Target dup2() handler.
246SyscallReturn dup2Func(SyscallDesc *desc, int num,
247 Process *process, ThreadContext *tc);
248
249/// Target fcntl() handler.
250SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
251 Process *process, ThreadContext *tc);
252
253/// Target fcntl64() handler.
254SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
255 Process *process, ThreadContext *tc);
256
257/// Target setuid() handler.
258SyscallReturn setuidFunc(SyscallDesc *desc, int num,
259 Process *p, ThreadContext *tc);
260
261/// Target pipe() handler.
262SyscallReturn pipeFunc(SyscallDesc *desc, int num,
263 Process *p, ThreadContext *tc);
264
265/// Internal pipe() handler.
266SyscallReturn pipeImpl(SyscallDesc *desc, int num, Process *p,
267 ThreadContext *tc, bool pseudoPipe);
268
269/// Target getpid() handler.
270SyscallReturn getpidFunc(SyscallDesc *desc, int num,
271 Process *p, ThreadContext *tc);
272
273/// Target getuid() handler.
274SyscallReturn getuidFunc(SyscallDesc *desc, int num,
275 Process *p, ThreadContext *tc);
276
277/// Target getgid() handler.
278SyscallReturn getgidFunc(SyscallDesc *desc, int num,
279 Process *p, ThreadContext *tc);
280
281/// Target getppid() handler.
282SyscallReturn getppidFunc(SyscallDesc *desc, int num,
283 Process *p, ThreadContext *tc);
284
285/// Target geteuid() handler.
286SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
287 Process *p, ThreadContext *tc);
288
289/// Target getegid() handler.
290SyscallReturn getegidFunc(SyscallDesc *desc, int num,
291 Process *p, ThreadContext *tc);
292
293/// Target access() handler
294SyscallReturn accessFunc(SyscallDesc *desc, int num,
295 Process *p, ThreadContext *tc);
296SyscallReturn accessFunc(SyscallDesc *desc, int num,
297 Process *p, ThreadContext *tc,
298 int index);
299
300/// Futex system call
301/// Implemented by Daniel Sanchez
302/// Used by printf's in multi-threaded apps
303template <class OS>
304SyscallReturn
305futexFunc(SyscallDesc *desc, int callnum, Process *process,
306 ThreadContext *tc)
307{
308 using namespace std;
309
310 int index = 0;
311 Addr uaddr = process->getSyscallArg(tc, index);
312 int op = process->getSyscallArg(tc, index);
313 int val = process->getSyscallArg(tc, index);
314
315 /*
316 * Unsupported option that does not affect the correctness of the
317 * application. This is a performance optimization utilized by Linux.
318 */
319 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
320
321 FutexMap &futex_map = tc->getSystemPtr()->futexMap;
322
323 if (OS::TGT_FUTEX_WAIT == op) {
324 // Ensure futex system call accessed atomically.
325 BufferArg buf(uaddr, sizeof(int));
326 buf.copyIn(tc->getMemProxy());
327 int mem_val = *(int*)buf.bufferPtr();
328
329 /*
330 * The value in memory at uaddr is not equal with the expected val
331 * (a different thread must have changed it before the system call was
332 * invoked). In this case, we need to throw an error.
333 */
334 if (val != mem_val)
335 return -OS::TGT_EWOULDBLOCK;
336
337 futex_map.suspend(uaddr, process->tgid(), tc);
338
339 return 0;
340 } else if (OS::TGT_FUTEX_WAKE == op) {
341 return futex_map.wakeup(uaddr, process->tgid(), val);
342 }
343
344 warn("futex: op %d not implemented; ignoring.", op);
345 return -ENOSYS;
346}
347
348
349/// Pseudo Funcs - These functions use a different return convension,
350/// returning a second value in a register other than the normal return register
351SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
352 Process *process, ThreadContext *tc);
353
354/// Target getpidPseudo() handler.
355SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
356 Process *p, ThreadContext *tc);
357
358/// Target getuidPseudo() handler.
359SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
360 Process *p, ThreadContext *tc);
361
362/// Target getgidPseudo() handler.
363SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
364 Process *p, ThreadContext *tc);
365
366
367/// A readable name for 1,000,000, for converting microseconds to seconds.
368const int one_million = 1000000;
369/// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
370const int one_billion = 1000000000;
371
372/// Approximate seconds since the epoch (1/1/1970). About a billion,
373/// by my reckoning. We want to keep this a constant (not use the
374/// real-world time) to keep simulations repeatable.
375const unsigned seconds_since_epoch = 1000000000;
376
377/// Helper function to convert current elapsed time to seconds and
378/// microseconds.
379template <class T1, class T2>
380void
381getElapsedTimeMicro(T1 &sec, T2 &usec)
382{
383 uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
384 sec = elapsed_usecs / one_million;
385 usec = elapsed_usecs % one_million;
386}
387
388/// Helper function to convert current elapsed time to seconds and
389/// nanoseconds.
390template <class T1, class T2>
391void
392getElapsedTimeNano(T1 &sec, T2 &nsec)
393{
394 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
395 sec = elapsed_nsecs / one_billion;
396 nsec = elapsed_nsecs % one_billion;
397}
398
399//////////////////////////////////////////////////////////////////////
400//
401// The following emulation functions are generic, but need to be
402// templated to account for differences in types, constants, etc.
403//
404//////////////////////////////////////////////////////////////////////
405
406 typedef struct statfs hst_statfs;
407#if NO_STAT64
408 typedef struct stat hst_stat;
409 typedef struct stat hst_stat64;
410#else
411 typedef struct stat hst_stat;
412 typedef struct stat64 hst_stat64;
413#endif
414
415//// Helper function to convert a host stat buffer to a target stat
416//// buffer. Also copies the target buffer out to the simulated
417//// memory space. Used by stat(), fstat(), and lstat().
418
419template <typename target_stat, typename host_stat>
420static void
421convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
422{
423 using namespace TheISA;
424
425 if (fakeTTY)
426 tgt->st_dev = 0xA;
427 else
428 tgt->st_dev = host->st_dev;
429 tgt->st_dev = TheISA::htog(tgt->st_dev);
430 tgt->st_ino = host->st_ino;
431 tgt->st_ino = TheISA::htog(tgt->st_ino);
432 tgt->st_mode = host->st_mode;
433 if (fakeTTY) {
434 // Claim to be a character device
435 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
436 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
437 }
438 tgt->st_mode = TheISA::htog(tgt->st_mode);
439 tgt->st_nlink = host->st_nlink;
440 tgt->st_nlink = TheISA::htog(tgt->st_nlink);
441 tgt->st_uid = host->st_uid;
442 tgt->st_uid = TheISA::htog(tgt->st_uid);
443 tgt->st_gid = host->st_gid;
444 tgt->st_gid = TheISA::htog(tgt->st_gid);
445 if (fakeTTY)
446 tgt->st_rdev = 0x880d;
447 else
448 tgt->st_rdev = host->st_rdev;
449 tgt->st_rdev = TheISA::htog(tgt->st_rdev);
450 tgt->st_size = host->st_size;
451 tgt->st_size = TheISA::htog(tgt->st_size);
452 tgt->st_atimeX = host->st_atime;
453 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
454 tgt->st_mtimeX = host->st_mtime;
455 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
456 tgt->st_ctimeX = host->st_ctime;
457 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
458 // Force the block size to be 8KB. This helps to ensure buffered io works
459 // consistently across different hosts.
460 tgt->st_blksize = 0x2000;
461 tgt->st_blksize = TheISA::htog(tgt->st_blksize);
462 tgt->st_blocks = host->st_blocks;
463 tgt->st_blocks = TheISA::htog(tgt->st_blocks);
464}
465
466// Same for stat64
467
468template <typename target_stat, typename host_stat64>
469static void
470convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
471{
472 using namespace TheISA;
473
474 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
475#if defined(STAT_HAVE_NSEC)
476 tgt->st_atime_nsec = host->st_atime_nsec;
477 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
478 tgt->st_mtime_nsec = host->st_mtime_nsec;
479 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
480 tgt->st_ctime_nsec = host->st_ctime_nsec;
481 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
482#else
483 tgt->st_atime_nsec = 0;
484 tgt->st_mtime_nsec = 0;
485 tgt->st_ctime_nsec = 0;
486#endif
487}
488
489// Here are a couple of convenience functions
490template<class OS>
491static void
492copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
493 hst_stat *host, bool fakeTTY = false)
494{
495 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
496 tgt_stat_buf tgt(addr);
497 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
498 tgt.copyOut(mem);
499}
500
501template<class OS>
502static void
503copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
504 hst_stat64 *host, bool fakeTTY = false)
505{
506 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
507 tgt_stat_buf tgt(addr);
508 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
509 tgt.copyOut(mem);
510}
511
512template <class OS>
513static void
514copyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr,
515 hst_statfs *host)
516{
517 TypedBufferArg<typename OS::tgt_statfs> tgt(addr);
518
519 tgt->f_type = TheISA::htog(host->f_type);
520#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
521 tgt->f_bsize = TheISA::htog(host->f_iosize);
522#else
523 tgt->f_bsize = TheISA::htog(host->f_bsize);
524#endif
525 tgt->f_blocks = TheISA::htog(host->f_blocks);
526 tgt->f_bfree = TheISA::htog(host->f_bfree);
527 tgt->f_bavail = TheISA::htog(host->f_bavail);
528 tgt->f_files = TheISA::htog(host->f_files);
529 tgt->f_ffree = TheISA::htog(host->f_ffree);
530 memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid));
531#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
532 tgt->f_namelen = TheISA::htog(host->f_namemax);
533 tgt->f_frsize = TheISA::htog(host->f_bsize);
534#elif defined(__APPLE__)
535 tgt->f_namelen = 0;
536 tgt->f_frsize = 0;
537#else
538 tgt->f_namelen = TheISA::htog(host->f_namelen);
539 tgt->f_frsize = TheISA::htog(host->f_frsize);
540#endif
541#if defined(__linux__)
542 memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare));
543#else
544 /*
545 * The fields are different sizes per OS. Don't bother with
546 * f_spare or f_reserved on non-Linux for now.
547 */
548 memset(&tgt->f_spare, 0, sizeof(tgt->f_spare));
549#endif
550
551 tgt.copyOut(mem);
552}
553
554/// Target ioctl() handler. For the most part, programs call ioctl()
555/// only to find out if their stdout is a tty, to determine whether to
556/// do line or block buffering. We always claim that output fds are
557/// not TTYs to provide repeatable results.
558template <class OS>
559SyscallReturn
560ioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
561{
562 int index = 0;
563 int tgt_fd = p->getSyscallArg(tc, index);
564 unsigned req = p->getSyscallArg(tc, index);
565
566 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req);
567
568 if (OS::isTtyReq(req))
569 return -ENOTTY;
570
571 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]);
572 if (!dfdp)
573 return -EBADF;
574
575 /**
576 * If the driver is valid, issue the ioctl through it. Otherwise,
577 * there's an implicit assumption that the device is a TTY type and we
578 * return that we do not have a valid TTY.
579 */
580 EmulatedDriver *emul_driver = dfdp->getDriver();
581 if (emul_driver)
582 return emul_driver->ioctl(p, tc, req);
583
584 /**
585 * For lack of a better return code, return ENOTTY. Ideally, we should
586 * return something better here, but at least we issue the warning.
587 */
588 warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n",
589 tgt_fd, req, tc->pcState());
590 return -ENOTTY;
591}
592
593template <class OS>
594SyscallReturn
595openImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc,
596 bool isopenat)
597{
598 int index = 0;
599 int tgt_dirfd = -1;
600
601 /**
602 * If using the openat variant, read in the target directory file
603 * descriptor from the simulated process.
604 */
605 if (isopenat)
606 tgt_dirfd = p->getSyscallArg(tc, index);
607
608 /**
609 * Retrieve the simulated process' memory proxy and then read in the path
610 * string from that memory space into the host's working memory space.
611 */
612 std::string path;
613 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
614 return -EFAULT;
615
616#ifdef __CYGWIN32__
617 int host_flags = O_BINARY;
618#else
619 int host_flags = 0;
620#endif
621 /**
622 * Translate target flags into host flags. Flags exist which are not
623 * ported between architectures which can cause check failures.
624 */
625 int tgt_flags = p->getSyscallArg(tc, index);
626 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
627 if (tgt_flags & OS::openFlagTable[i].tgtFlag) {
628 tgt_flags &= ~OS::openFlagTable[i].tgtFlag;
629 host_flags |= OS::openFlagTable[i].hostFlag;
630 }
631 }
632 if (tgt_flags) {
633 warn("open%s: cannot decode flags 0x%x",
634 isopenat ? "at" : "", tgt_flags);
635 }
636#ifdef __CYGWIN32__
637 host_flags |= O_BINARY;
638#endif
639
640 int mode = p->getSyscallArg(tc, index);
641
642 /**
643 * If the simulated process called open or openat with AT_FDCWD specified,
644 * take the current working directory value which was passed into the
645 * process class as a Python parameter and append the current path to
646 * create a full path.
647 * Otherwise, openat with a valid target directory file descriptor has
648 * been called. If the path option, which was passed in as a parameter,
649 * is not absolute, retrieve the directory file descriptor's path and
650 * prepend it to the path passed in as a parameter.
651 * In every case, we should have a full path (which is relevant to the
652 * host) to work with after this block has been passed.
653 */
654 if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) {
655 path = p->fullPath(path);
656 } else if (!startswith(path, "/")) {
657 std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]);
658 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep);
659 if (!ffdp)
660 return -EBADF;
661 path.insert(0, ffdp->getFileName());
662 }
663
664 /**
665 * Since this is an emulated environment, we create pseudo file
666 * descriptors for device requests that have been registered with
667 * the process class through Python; this allows us to create a file
668 * descriptor for subsequent ioctl or mmap calls.
669 */
670 if (startswith(path, "/dev/")) {
671 std::string filename = path.substr(strlen("/dev/"));
672 EmulatedDriver *drv = p->findDriver(filename);
673 if (drv) {
674 DPRINTF_SYSCALL(Verbose, "open%s: passing call to "
675 "driver open with path[%s]\n",
676 isopenat ? "at" : "", path.c_str());
677 return drv->open(p, tc, mode, host_flags);
678 }
679 /**
680 * Fall through here for pass through to host devices, such
681 * as /dev/zero
682 */
683 }
684
685 /**
686 * Some special paths and files cannot be called on the host and need
687 * to be handled as special cases inside the simulator.
688 * If the full path that was created above does not match any of the
689 * special cases, pass it through to the open call on the host to let
690 * the host open the file on our behalf.
691 * If the host cannot open the file, return the host's error code back
692 * through the system call to the simulated process.
693 */
694 int sim_fd = -1;
695 std::vector<std::string> special_paths =
696 { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" };
697 for (auto entry : special_paths) {
698 if (startswith(path, entry))
699 sim_fd = OS::openSpecialFile(path, p, tc);
700 }
701 if (sim_fd == -1) {
702 sim_fd = open(path.c_str(), host_flags, mode);
703 }
704 if (sim_fd == -1) {
705 int local = -errno;
706 DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n",
707 isopenat ? "at" : "", path.c_str());
708 return local;
709 }
710
711 /**
712 * The file was opened successfully and needs to be recorded in the
713 * process' file descriptor array so that it can be retrieved later.
714 * The target file descriptor that is chosen will be the lowest unused
715 * file descriptor.
716 * Return the indirect target file descriptor back to the simulated
717 * process to act as a handle for the opened file.
718 */
719 auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0);
720 int tgt_fd = p->fds->allocFD(ffdp);
721 DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n",
722 isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str());
723 return tgt_fd;
724}
725
726/// Target open() handler.
727template <class OS>
728SyscallReturn
729openFunc(SyscallDesc *desc, int callnum, Process *process,
730 ThreadContext *tc)
731{
732 return openImpl<OS>(desc, callnum, process, tc, false);
733}
734
735/// Target openat() handler.
736template <class OS>
737SyscallReturn
738openatFunc(SyscallDesc *desc, int callnum, Process *process,
739 ThreadContext *tc)
740{
741 return openImpl<OS>(desc, callnum, process, tc, true);
742}
743
744/// Target unlinkat() handler.
745template <class OS>
746SyscallReturn
747unlinkatFunc(SyscallDesc *desc, int callnum, Process *process,
748 ThreadContext *tc)
749{
750 int index = 0;
751 int dirfd = process->getSyscallArg(tc, index);
752 if (dirfd != OS::TGT_AT_FDCWD)
753 warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
754
755 return unlinkHelper(desc, callnum, process, tc, 1);
756}
757
758/// Target facessat() handler
759template <class OS>
760SyscallReturn
761faccessatFunc(SyscallDesc *desc, int callnum, Process *process,
762 ThreadContext *tc)
763{
764 int index = 0;
765 int dirfd = process->getSyscallArg(tc, index);
766 if (dirfd != OS::TGT_AT_FDCWD)
767 warn("faccessat: first argument not AT_FDCWD; unlikely to work");
768 return accessFunc(desc, callnum, process, tc, 1);
769}
770
771/// Target readlinkat() handler
772template <class OS>
773SyscallReturn
774readlinkatFunc(SyscallDesc *desc, int callnum, Process *process,
775 ThreadContext *tc)
776{
777 int index = 0;
778 int dirfd = process->getSyscallArg(tc, index);
779 if (dirfd != OS::TGT_AT_FDCWD)
780 warn("openat: first argument not AT_FDCWD; unlikely to work");
781 return readlinkFunc(desc, callnum, process, tc, 1);
782}
783
784/// Target renameat() handler.
785template <class OS>
786SyscallReturn
787renameatFunc(SyscallDesc *desc, int callnum, Process *process,
788 ThreadContext *tc)
789{
790 int index = 0;
791
792 int olddirfd = process->getSyscallArg(tc, index);
793 if (olddirfd != OS::TGT_AT_FDCWD)
794 warn("renameat: first argument not AT_FDCWD; unlikely to work");
795
796 std::string old_name;
797
798 if (!tc->getMemProxy().tryReadString(old_name,
799 process->getSyscallArg(tc, index)))
800 return -EFAULT;
801
802 int newdirfd = process->getSyscallArg(tc, index);
803 if (newdirfd != OS::TGT_AT_FDCWD)
804 warn("renameat: third argument not AT_FDCWD; unlikely to work");
805
806 std::string new_name;
807
808 if (!tc->getMemProxy().tryReadString(new_name,
809 process->getSyscallArg(tc, index)))
810 return -EFAULT;
811
812 // Adjust path for current working directory
813 old_name = process->fullPath(old_name);
814 new_name = process->fullPath(new_name);
815
816 int result = rename(old_name.c_str(), new_name.c_str());
817 return (result == -1) ? -errno : result;
818}
819
820/// Target sysinfo() handler.
821template <class OS>
822SyscallReturn
823sysinfoFunc(SyscallDesc *desc, int callnum, Process *process,
824 ThreadContext *tc)
825{
826
827 int index = 0;
828 TypedBufferArg<typename OS::tgt_sysinfo>
829 sysinfo(process->getSyscallArg(tc, index));
830
831 sysinfo->uptime = seconds_since_epoch;
832 sysinfo->totalram = process->system->memSize();
833 sysinfo->mem_unit = 1;
834
835 sysinfo.copyOut(tc->getMemProxy());
836
837 return 0;
838}
839
840/// Target chmod() handler.
841template <class OS>
842SyscallReturn
843chmodFunc(SyscallDesc *desc, int callnum, Process *process,
844 ThreadContext *tc)
845{
846 std::string path;
847
848 int index = 0;
849 if (!tc->getMemProxy().tryReadString(path,
850 process->getSyscallArg(tc, index))) {
851 return -EFAULT;
852 }
853
854 uint32_t mode = process->getSyscallArg(tc, index);
855 mode_t hostMode = 0;
856
857 // XXX translate mode flags via OS::something???
858 hostMode = mode;
859
860 // Adjust path for current working directory
861 path = process->fullPath(path);
862
863 // do the chmod
864 int result = chmod(path.c_str(), hostMode);
865 if (result < 0)
866 return -errno;
867
868 return 0;
869}
870
871
872/// Target fchmod() handler.
873template <class OS>
874SyscallReturn
875fchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
876{
877 int index = 0;
878 int tgt_fd = p->getSyscallArg(tc, index);
879 uint32_t mode = p->getSyscallArg(tc, index);
880
881 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
882 if (!ffdp)
883 return -EBADF;
884 int sim_fd = ffdp->getSimFD();
885
886 mode_t hostMode = mode;
887
888 int result = fchmod(sim_fd, hostMode);
889
890 return (result < 0) ? -errno : 0;
891}
892
893/// Target mremap() handler.
894template <class OS>
895SyscallReturn
896mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
897{
898 int index = 0;
899 Addr start = process->getSyscallArg(tc, index);
900 uint64_t old_length = process->getSyscallArg(tc, index);
901 uint64_t new_length = process->getSyscallArg(tc, index);
902 uint64_t flags = process->getSyscallArg(tc, index);
903 uint64_t provided_address = 0;
904 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
905
906 if (use_provided_address)
907 provided_address = process->getSyscallArg(tc, index);
908
909 if ((start % TheISA::PageBytes != 0) ||
910 (provided_address % TheISA::PageBytes != 0)) {
911 warn("mremap failing: arguments not page aligned");
912 return -EINVAL;
913 }
914
915 new_length = roundUp(new_length, TheISA::PageBytes);
916
917 if (new_length > old_length) {
918 std::shared_ptr<MemState> mem_state = process->memState;
919 Addr mmap_end = mem_state->getMmapEnd();
920
921 if ((start + old_length) == mmap_end &&
922 (!use_provided_address || provided_address == start)) {
923 uint64_t diff = new_length - old_length;
924 process->allocateMem(mmap_end, diff);
925 mem_state->setMmapEnd(mmap_end + diff);
926 return start;
927 } else {
928 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
929 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
930 return -ENOMEM;
931 } else {
932 uint64_t new_start = use_provided_address ?
933 provided_address : mmap_end;
934 process->pTable->remap(start, old_length, new_start);
935 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
936 new_start, new_start + new_length,
937 new_length - old_length);
938 // add on the remaining unallocated pages
939 process->allocateMem(new_start + old_length,
940 new_length - old_length,
941 use_provided_address /* clobber */);
942 if (!use_provided_address)
943 mem_state->setMmapEnd(mmap_end + new_length);
944 if (use_provided_address &&
945 new_start + new_length > mem_state->getMmapEnd()) {
946 // something fishy going on here, at least notify the user
947 // @todo: increase mmap_end?
948 warn("mmap region limit exceeded with MREMAP_FIXED\n");
949 }
950 warn("returning %08p as start\n", new_start);
951 return new_start;
952 }
953 }
954 } else {
955 if (use_provided_address && provided_address != start)
956 process->pTable->remap(start, new_length, provided_address);
957 process->pTable->unmap(start + new_length, old_length - new_length);
958 return use_provided_address ? provided_address : start;
959 }
960}
961
962/// Target stat() handler.
963template <class OS>
964SyscallReturn
965statFunc(SyscallDesc *desc, int callnum, Process *process,
966 ThreadContext *tc)
967{
968 std::string path;
969
970 int index = 0;
971 if (!tc->getMemProxy().tryReadString(path,
972 process->getSyscallArg(tc, index))) {
973 return -EFAULT;
974 }
975 Addr bufPtr = process->getSyscallArg(tc, index);
976
977 // Adjust path for current working directory
978 path = process->fullPath(path);
979
980 struct stat hostBuf;
981 int result = stat(path.c_str(), &hostBuf);
982
983 if (result < 0)
984 return -errno;
985
986 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
987
988 return 0;
989}
990
991
992/// Target stat64() handler.
993template <class OS>
994SyscallReturn
995stat64Func(SyscallDesc *desc, int callnum, Process *process,
996 ThreadContext *tc)
997{
998 std::string path;
999
1000 int index = 0;
1001 if (!tc->getMemProxy().tryReadString(path,
1002 process->getSyscallArg(tc, index)))
1003 return -EFAULT;
1004 Addr bufPtr = process->getSyscallArg(tc, index);
1005
1006 // Adjust path for current working directory
1007 path = process->fullPath(path);
1008
1009#if NO_STAT64
1010 struct stat hostBuf;
1011 int result = stat(path.c_str(), &hostBuf);
1012#else
1013 struct stat64 hostBuf;
1014 int result = stat64(path.c_str(), &hostBuf);
1015#endif
1016
1017 if (result < 0)
1018 return -errno;
1019
1020 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1021
1022 return 0;
1023}
1024
1025
1026/// Target fstatat64() handler.
1027template <class OS>
1028SyscallReturn
1029fstatat64Func(SyscallDesc *desc, int callnum, Process *process,
1030 ThreadContext *tc)
1031{
1032 int index = 0;
1033 int dirfd = process->getSyscallArg(tc, index);
1034 if (dirfd != OS::TGT_AT_FDCWD)
1035 warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
1036
1037 std::string path;
1038 if (!tc->getMemProxy().tryReadString(path,
1039 process->getSyscallArg(tc, index)))
1040 return -EFAULT;
1041 Addr bufPtr = process->getSyscallArg(tc, index);
1042
1043 // Adjust path for current working directory
1044 path = process->fullPath(path);
1045
1046#if NO_STAT64
1047 struct stat hostBuf;
1048 int result = stat(path.c_str(), &hostBuf);
1049#else
1050 struct stat64 hostBuf;
1051 int result = stat64(path.c_str(), &hostBuf);
1052#endif
1053
1054 if (result < 0)
1055 return -errno;
1056
1057 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1058
1059 return 0;
1060}
1061
1062
1063/// Target fstat64() handler.
1064template <class OS>
1065SyscallReturn
1066fstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1067{
1068 int index = 0;
1069 int tgt_fd = p->getSyscallArg(tc, index);
1070 Addr bufPtr = p->getSyscallArg(tc, index);
1071
1072 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1073 if (!ffdp)
1074 return -EBADF;
1075 int sim_fd = ffdp->getSimFD();
1076
1077#if NO_STAT64
1078 struct stat hostBuf;
1079 int result = fstat(sim_fd, &hostBuf);
1080#else
1081 struct stat64 hostBuf;
1082 int result = fstat64(sim_fd, &hostBuf);
1083#endif
1084
1085 if (result < 0)
1086 return -errno;
1087
1088 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1089
1090 return 0;
1091}
1092
1093
1094/// Target lstat() handler.
1095template <class OS>
1096SyscallReturn
1097lstatFunc(SyscallDesc *desc, int callnum, Process *process,
1098 ThreadContext *tc)
1099{
1100 std::string path;
1101
1102 int index = 0;
1103 if (!tc->getMemProxy().tryReadString(path,
1104 process->getSyscallArg(tc, index))) {
1105 return -EFAULT;
1106 }
1107 Addr bufPtr = process->getSyscallArg(tc, index);
1108
1109 // Adjust path for current working directory
1110 path = process->fullPath(path);
1111
1112 struct stat hostBuf;
1113 int result = lstat(path.c_str(), &hostBuf);
1114
1115 if (result < 0)
1116 return -errno;
1117
1118 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1119
1120 return 0;
1121}
1122
1123/// Target lstat64() handler.
1124template <class OS>
1125SyscallReturn
1126lstat64Func(SyscallDesc *desc, int callnum, Process *process,
1127 ThreadContext *tc)
1128{
1129 std::string path;
1130
1131 int index = 0;
1132 if (!tc->getMemProxy().tryReadString(path,
1133 process->getSyscallArg(tc, index))) {
1134 return -EFAULT;
1135 }
1136 Addr bufPtr = process->getSyscallArg(tc, index);
1137
1138 // Adjust path for current working directory
1139 path = process->fullPath(path);
1140
1141#if NO_STAT64
1142 struct stat hostBuf;
1143 int result = lstat(path.c_str(), &hostBuf);
1144#else
1145 struct stat64 hostBuf;
1146 int result = lstat64(path.c_str(), &hostBuf);
1147#endif
1148
1149 if (result < 0)
1150 return -errno;
1151
1152 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1153
1154 return 0;
1155}
1156
1157/// Target fstat() handler.
1158template <class OS>
1159SyscallReturn
1160fstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1161{
1162 int index = 0;
1163 int tgt_fd = p->getSyscallArg(tc, index);
1164 Addr bufPtr = p->getSyscallArg(tc, index);
1165
1166 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd);
1167
1168 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1169 if (!ffdp)
1170 return -EBADF;
1171 int sim_fd = ffdp->getSimFD();
1172
1173 struct stat hostBuf;
1174 int result = fstat(sim_fd, &hostBuf);
1175
1176 if (result < 0)
1177 return -errno;
1178
1179 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1180
1181 return 0;
1182}
1183
1184
1185/// Target statfs() handler.
1186template <class OS>
1187SyscallReturn
1188statfsFunc(SyscallDesc *desc, int callnum, Process *process,
1189 ThreadContext *tc)
1190{
1191#if NO_STATFS
1192 warn("Host OS cannot support calls to statfs. Ignoring syscall");
1193#else
1194 std::string path;
1195
1196 int index = 0;
1197 if (!tc->getMemProxy().tryReadString(path,
1198 process->getSyscallArg(tc, index))) {
1199 return -EFAULT;
1200 }
1201 Addr bufPtr = process->getSyscallArg(tc, index);
1202
1203 // Adjust path for current working directory
1204 path = process->fullPath(path);
1205
1206 struct statfs hostBuf;
1207 int result = statfs(path.c_str(), &hostBuf);
1208
1209 if (result < 0)
1210 return -errno;
1211
1212 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1213#endif
1214 return 0;
1215}
1216
1217template <class OS>
1218SyscallReturn
1219cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1220{
1221 int index = 0;
1222 TheISA::IntReg flags = p->getSyscallArg(tc, index);
1223 TheISA::IntReg newStack = p->getSyscallArg(tc, index);
1224 Addr ptidPtr = p->getSyscallArg(tc, index);
1225 Addr ctidPtr = p->getSyscallArg(tc, index);
1226 Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index);
1227
1228 if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) ||
1229 ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) ||
1230 ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) ||
1231 ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) ||
1232 ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) ||
1233 ((flags & OS::TGT_CLONE_VM) && !(newStack)))
1234 return -EINVAL;
1235
1236 ThreadContext *ctc;
1237 if (!(ctc = p->findFreeContext()))
1238 fatal("clone: no spare thread context in system");
1239
1240 /**
1241 * Note that ProcessParams is generated by swig and there are no other
1242 * examples of how to create anything but this default constructor. The
1243 * fields are manually initialized instead of passing parameters to the
1244 * constructor.
1245 */
1246 ProcessParams *pp = new ProcessParams();
1247 pp->executable.assign(*(new std::string(p->progName())));
1248 pp->cmd.push_back(*(new std::string(p->progName())));
1249 pp->system = p->system;
1250 pp->cwd.assign(p->getcwd());
1251 pp->input.assign("stdin");
1252 pp->output.assign("stdout");
1253 pp->errout.assign("stderr");
1254 pp->uid = p->uid();
1255 pp->euid = p->euid();
1256 pp->gid = p->gid();
1257 pp->egid = p->egid();
1258
1259 /* Find the first free PID that's less than the maximum */
1260 std::set<int> const& pids = p->system->PIDs;
1261 int temp_pid = *pids.begin();
1262 do {
1263 temp_pid++;
1264 } while (pids.find(temp_pid) != pids.end());
1265 if (temp_pid >= System::maxPID)
1266 fatal("temp_pid is too large: %d", temp_pid);
1267
1268 pp->pid = temp_pid;
1269 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid();
1270 Process *cp = pp->create();
1271 delete pp;
1272
1273 Process *owner = ctc->getProcessPtr();
1274 ctc->setProcessPtr(cp);
1275 cp->assignThreadContext(ctc->contextId());
1276 owner->revokeThreadContext(ctc->contextId());
1277
1278 if (flags & OS::TGT_CLONE_PARENT_SETTID) {
1279 BufferArg ptidBuf(ptidPtr, sizeof(long));
1280 long *ptid = (long *)ptidBuf.bufferPtr();
1281 *ptid = cp->pid();
1282 ptidBuf.copyOut(tc->getMemProxy());
1283 }
1284
1285 cp->initState();
1286 p->clone(tc, ctc, cp, flags);
1287
1288 if (flags & OS::TGT_CLONE_THREAD) {
1289 delete cp->sigchld;
1290 cp->sigchld = p->sigchld;
1291 } else if (flags & OS::TGT_SIGCHLD) {
1292 *cp->sigchld = true;
1293 }
1294
1295 if (flags & OS::TGT_CLONE_CHILD_SETTID) {
1296 BufferArg ctidBuf(ctidPtr, sizeof(long));
1297 long *ctid = (long *)ctidBuf.bufferPtr();
1298 *ctid = cp->pid();
1299 ctidBuf.copyOut(ctc->getMemProxy());
1300 }
1301
1302 if (flags & OS::TGT_CLONE_CHILD_CLEARTID)
1303 cp->childClearTID = (uint64_t)ctidPtr;
1304
1305 ctc->clearArchRegs();
1306
1307#if THE_ISA == ALPHA_ISA
1308 TheISA::copyMiscRegs(tc, ctc);
1309#elif THE_ISA == SPARC_ISA
1310 TheISA::copyRegs(tc, ctc);
1311 ctc->setIntReg(TheISA::NumIntArchRegs + 6, 0);
1312 ctc->setIntReg(TheISA::NumIntArchRegs + 4, 0);
1313 ctc->setIntReg(TheISA::NumIntArchRegs + 3, TheISA::NWindows - 2);
1314 ctc->setIntReg(TheISA::NumIntArchRegs + 5, TheISA::NWindows);
1315 ctc->setMiscReg(TheISA::MISCREG_CWP, 0);
1316 ctc->setIntReg(TheISA::NumIntArchRegs + 7, 0);
1317 ctc->setMiscRegNoEffect(TheISA::MISCREG_TL, 0);
1318 ctc->setMiscReg(TheISA::MISCREG_ASI, TheISA::ASI_PRIMARY);
1319 for (int y = 8; y < 32; y++)
1320 ctc->setIntReg(y, tc->readIntReg(y));
1321#elif THE_ISA == ARM_ISA or THE_ISA == X86_ISA
1322 TheISA::copyRegs(tc, ctc);
1323#endif
1324
1325#if THE_ISA == X86_ISA
1326 if (flags & OS::TGT_CLONE_SETTLS) {
1327 ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_BASE, tlsPtr);
1328 ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_EFF_BASE, tlsPtr);
1329 }
1330#endif
1331
1332 if (newStack)
1333 ctc->setIntReg(TheISA::StackPointerReg, newStack);
1334
1335 cp->setSyscallReturn(ctc, 0);
1336
1337#if THE_ISA == ALPHA_ISA
1338 ctc->setIntReg(TheISA::SyscallSuccessReg, 0);
1339#elif THE_ISA == SPARC_ISA
1340 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0);
1341 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1);
1342#endif
1343
1344 ctc->pcState(tc->nextInstAddr());
1345 ctc->activate();
1346
1347 return cp->pid();
1348}
1349
1350/// Target fstatfs() handler.
1351template <class OS>
1352SyscallReturn
1353fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1354{
1355 int index = 0;
1356 int tgt_fd = p->getSyscallArg(tc, index);
1357 Addr bufPtr = p->getSyscallArg(tc, index);
1358
1359 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1360 if (!ffdp)
1361 return -EBADF;
1362 int sim_fd = ffdp->getSimFD();
1363
1364 struct statfs hostBuf;
1365 int result = fstatfs(sim_fd, &hostBuf);
1366
1367 if (result < 0)
1368 return -errno;
1369
1370 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1371
1372 return 0;
1373}
1374
1375
1376/// Target writev() handler.
1377template <class OS>
1378SyscallReturn
1379writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1380{
1381 int index = 0;
1382 int tgt_fd = p->getSyscallArg(tc, index);
1383
1384 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
1385 if (!hbfdp)
1386 return -EBADF;
1387 int sim_fd = hbfdp->getSimFD();
1388
1389 SETranslatingPortProxy &prox = tc->getMemProxy();
1390 uint64_t tiov_base = p->getSyscallArg(tc, index);
1391 size_t count = p->getSyscallArg(tc, index);
1392 struct iovec hiov[count];
1393 for (size_t i = 0; i < count; ++i) {
1394 typename OS::tgt_iovec tiov;
1395
1396 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1397 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1398 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1399 hiov[i].iov_base = new char [hiov[i].iov_len];
1400 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1401 hiov[i].iov_len);
1402 }
1403
1404 int result = writev(sim_fd, hiov, count);
1405
1406 for (size_t i = 0; i < count; ++i)
1407 delete [] (char *)hiov[i].iov_base;
1408
1409 if (result < 0)
1410 return -errno;
1411
1412 return result;
1413}
1414
1415/// Real mmap handler.
1416template <class OS>
1417SyscallReturn
1418mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc,
1419 bool is_mmap2)
1420{
1421 int index = 0;
1422 Addr start = p->getSyscallArg(tc, index);
1423 uint64_t length = p->getSyscallArg(tc, index);
1424 int prot = p->getSyscallArg(tc, index);
1425 int tgt_flags = p->getSyscallArg(tc, index);
1426 int tgt_fd = p->getSyscallArg(tc, index);
1427 int offset = p->getSyscallArg(tc, index);
1428
1429 if (is_mmap2)
1430 offset *= TheISA::PageBytes;
1431
1432 if (start & (TheISA::PageBytes - 1) ||
1433 offset & (TheISA::PageBytes - 1) ||
1434 (tgt_flags & OS::TGT_MAP_PRIVATE &&
1435 tgt_flags & OS::TGT_MAP_SHARED) ||
1436 (!(tgt_flags & OS::TGT_MAP_PRIVATE) &&
1437 !(tgt_flags & OS::TGT_MAP_SHARED)) ||
1438 !length) {
1439 return -EINVAL;
1440 }
1441
1442 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) {
1443 // With shared mmaps, there are two cases to consider:
1444 // 1) anonymous: writes should modify the mapping and this should be
1445 // visible to observers who share the mapping. Currently, it's
1446 // difficult to update the shared mapping because there's no
1447 // structure which maintains information about the which virtual
1448 // memory areas are shared. If that structure existed, it would be
1449 // possible to make the translations point to the same frames.
1450 // 2) file-backed: writes should modify the mapping and the file
1451 // which is backed by the mapping. The shared mapping problem is the
1452 // same as what was mentioned about the anonymous mappings. For
1453 // file-backed mappings, the writes to the file are difficult
1454 // because it requires syncing what the mapping holds with the file
1455 // that resides on the host system. So, any write on a real system
1456 // would cause the change to be propagated to the file mapping at
1457 // some point in the future (the inode is tracked along with the
1458 // mapping). This isn't guaranteed to always happen, but it usually
1459 // works well enough. The guarantee is provided by the msync system
1460 // call. We could force the change through with shared mappings with
1461 // a call to msync, but that again would require more information
1462 // than we currently maintain.
1463 warn("mmap: writing to shared mmap region is currently "
1464 "unsupported. The write succeeds on the target, but it "
1465 "will not be propagated to the host or shared mappings");
1466 }
1467
1468 length = roundUp(length, TheISA::PageBytes);
1469
1470 int sim_fd = -1;
1471 uint8_t *pmap = nullptr;
1472 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) {
1473 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd];
1474
1475 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep);
1476 if (dfdp) {
1477 EmulatedDriver *emul_driver = dfdp->getDriver();
1478 return emul_driver->mmap(p, tc, start, length, prot,
1479 tgt_flags, tgt_fd, offset);
1480 }
1481
1482 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep);
1483 if (!ffdp)
1484 return -EBADF;
1485 sim_fd = ffdp->getSimFD();
1486
1487 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE,
1488 sim_fd, offset);
1489
1490 if (pmap == (decltype(pmap))-1) {
1491 warn("mmap: failed to map file into host address space");
1492 return -errno;
1493 }
1494 }
1495
1496 // Extend global mmap region if necessary. Note that we ignore the
1497 // start address unless MAP_FIXED is specified.
1498 if (!(tgt_flags & OS::TGT_MAP_FIXED)) {
1499 std::shared_ptr<MemState> mem_state = p->memState;
1500 Addr mmap_end = mem_state->getMmapEnd();
1501
1502 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end;
1503 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length;
1504
1505 mem_state->setMmapEnd(mmap_end);
1506 }
1507
1508 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n",
1509 start, start + length - 1);
1510
1511 // We only allow mappings to overwrite existing mappings if
1512 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem
1513 // because we ignore the start hint if TGT_MAP_FIXED is not set.
1514 int clobber = tgt_flags & OS::TGT_MAP_FIXED;
1515 if (clobber) {
1516 for (auto tc : p->system->threadContexts) {
1517 // If we might be overwriting old mappings, we need to
1518 // invalidate potentially stale mappings out of the TLBs.
1519 tc->getDTBPtr()->flushAll();
1520 tc->getITBPtr()->flushAll();
1521 }
1522 }
1523
1524 // Allocate physical memory and map it in. If the page table is already
1525 // mapped and clobber is not set, the simulator will issue throw a
1526 // fatal and bail out of the simulation.
1527 p->allocateMem(start, length, clobber);
1528
1529 // Transfer content into target address space.
1530 SETranslatingPortProxy &tp = tc->getMemProxy();
1531 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) {
1532 // In general, we should zero the mapped area for anonymous mappings,
1533 // with something like:
1534 // tp.memsetBlob(start, 0, length);
1535 // However, given that we don't support sparse mappings, and
1536 // some applications can map a couple of gigabytes of space
1537 // (intending sparse usage), that can get painfully expensive.
1538 // Fortunately, since we don't properly implement munmap either,
1539 // there's no danger of remapping used memory, so for now all
1540 // newly mapped memory should already be zeroed so we can skip it.
1541 } else {
1542 // It is possible to mmap an area larger than a file, however
1543 // accessing unmapped portions the system triggers a "Bus error"
1544 // on the host. We must know when to stop copying the file from
1545 // the host into the target address space.
1546 struct stat file_stat;
1547 if (fstat(sim_fd, &file_stat) > 0)
1548 fatal("mmap: cannot stat file");
1549
1550 // Copy the portion of the file that is resident. This requires
1551 // checking both the mmap size and the filesize that we are
1552 // trying to mmap into this space; the mmap size also depends
1553 // on the specified offset into the file.
1554 uint64_t size = std::min((uint64_t)file_stat.st_size - offset,
1555 length);
1556 tp.writeBlob(start, pmap, size);
1557
1558 // Cleanup the mmap region before exiting this function.
1559 munmap(pmap, length);
1560
1561 // Maintain the symbol table for dynamic executables.
1562 // The loader will call mmap to map the images into its address
1563 // space and we intercept that here. We can verify that we are
1564 // executing inside the loader by checking the program counter value.
1565 // XXX: with multiprogrammed workloads or multi-node configurations,
1566 // this will not work since there is a single global symbol table.
1567 ObjectFile *interpreter = p->getInterpreter();
1568 if (interpreter) {
1569 Addr text_start = interpreter->textBase();
1570 Addr text_end = text_start + interpreter->textSize();
1571
1572 Addr pc = tc->pcState().pc();
1573
1574 if (pc >= text_start && pc < text_end) {
1575 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd];
1576 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep);
1577 ObjectFile *lib = createObjectFile(ffdp->getFileName());
1578
1579 if (lib) {
1580 lib->loadAllSymbols(debugSymbolTable,
1581 lib->textBase(), start);
1582 }
1583 }
1584 }
1585
1586 // Note that we do not zero out the remainder of the mapping. This
1587 // is done by a real system, but it probably will not affect
1588 // execution (hopefully).
1589 }
1590
1591 return start;
1592}
1593
1594template <class OS>
1595SyscallReturn
1596pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1597{
1598 int index = 0;
1599 int tgt_fd = p->getSyscallArg(tc, index);
1600 Addr bufPtr = p->getSyscallArg(tc, index);
1601 int nbytes = p->getSyscallArg(tc, index);
1602 int offset = p->getSyscallArg(tc, index);
1603
1604 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1605 if (!ffdp)
1606 return -EBADF;
1607 int sim_fd = ffdp->getSimFD();
1608
1609 BufferArg bufArg(bufPtr, nbytes);
1610 bufArg.copyIn(tc->getMemProxy());
1611
1612 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset);
1613
1614 return (bytes_written == -1) ? -errno : bytes_written;
1615}
1616
1617/// Target mmap() handler.
1618template <class OS>
1619SyscallReturn
1620mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1621{
1622 return mmapImpl<OS>(desc, num, p, tc, false);
1623}
1624
1625/// Target mmap2() handler.
1626template <class OS>
1627SyscallReturn
1628mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1629{
1630 return mmapImpl<OS>(desc, num, p, tc, true);
1631}
1632
1633/// Target getrlimit() handler.
1634template <class OS>
1635SyscallReturn
1636getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
1637 ThreadContext *tc)
1638{
1639 int index = 0;
1640 unsigned resource = process->getSyscallArg(tc, index);
1641 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1642
1643 switch (resource) {
1644 case OS::TGT_RLIMIT_STACK:
1645 // max stack size in bytes: make up a number (8MB for now)
1646 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1647 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1648 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1649 break;
1650
1651 case OS::TGT_RLIMIT_DATA:
1652 // max data segment size in bytes: make up a number
1653 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1654 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1655 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1656 break;
1657
1658 default:
1659 warn("getrlimit: unimplemented resource %d", resource);
1660 return -EINVAL;
1661 break;
1662 }
1663
1664 rlp.copyOut(tc->getMemProxy());
1665 return 0;
1666}
1667
1668/// Target clock_gettime() function.
1669template <class OS>
1670SyscallReturn
1671clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1672{
1673 int index = 1;
1674 //int clk_id = p->getSyscallArg(tc, index);
1675 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1676
1677 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1678 tp->tv_sec += seconds_since_epoch;
1679 tp->tv_sec = TheISA::htog(tp->tv_sec);
1680 tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1681
1682 tp.copyOut(tc->getMemProxy());
1683
1684 return 0;
1685}
1686
1687/// Target clock_getres() function.
1688template <class OS>
1689SyscallReturn
1690clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1691{
1692 int index = 1;
1693 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1694
1695 // Set resolution at ns, which is what clock_gettime() returns
1696 tp->tv_sec = 0;
1697 tp->tv_nsec = 1;
1698
1699 tp.copyOut(tc->getMemProxy());
1700
1701 return 0;
1702}
1703
1704/// Target gettimeofday() handler.
1705template <class OS>
1706SyscallReturn
1707gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
1708 ThreadContext *tc)
1709{
1710 int index = 0;
1711 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1712
1713 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1714 tp->tv_sec += seconds_since_epoch;
1715 tp->tv_sec = TheISA::htog(tp->tv_sec);
1716 tp->tv_usec = TheISA::htog(tp->tv_usec);
1717
1718 tp.copyOut(tc->getMemProxy());
1719
1720 return 0;
1721}
1722
1723
1724/// Target utimes() handler.
1725template <class OS>
1726SyscallReturn
1727utimesFunc(SyscallDesc *desc, int callnum, Process *process,
1728 ThreadContext *tc)
1729{
1730 std::string path;
1731
1732 int index = 0;
1733 if (!tc->getMemProxy().tryReadString(path,
1734 process->getSyscallArg(tc, index))) {
1735 return -EFAULT;
1736 }
1737
1738 TypedBufferArg<typename OS::timeval [2]>
1739 tp(process->getSyscallArg(tc, index));
1740 tp.copyIn(tc->getMemProxy());
1741
1742 struct timeval hostTimeval[2];
1743 for (int i = 0; i < 2; ++i) {
1744 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1745 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1746 }
1747
1748 // Adjust path for current working directory
1749 path = process->fullPath(path);
1750
1751 int result = utimes(path.c_str(), hostTimeval);
1752
1753 if (result < 0)
1754 return -errno;
1755
1756 return 0;
1757}
1758
1759template <class OS>
1760SyscallReturn
1761execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1762{
1763 desc->setFlags(0);
1764
1765 int index = 0;
1766 std::string path;
1767 SETranslatingPortProxy & mem_proxy = tc->getMemProxy();
1768 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index)))
1769 return -EFAULT;
1770
1771 if (access(path.c_str(), F_OK) == -1)
1772 return -EACCES;
1773
1774 auto read_in = [](std::vector<std::string> & vect,
1775 SETranslatingPortProxy & mem_proxy,
1776 Addr mem_loc)
1777 {
1778 for (int inc = 0; ; inc++) {
1779 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr));
1780 b.copyIn(mem_proxy);
1781
1782 if (!*(Addr*)b.bufferPtr())
1783 break;
1784
1785 vect.push_back(std::string());
1786 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr());
1787 }
1788 };
1789
1790 /**
1791 * Note that ProcessParams is generated by swig and there are no other
1792 * examples of how to create anything but this default constructor. The
1793 * fields are manually initialized instead of passing parameters to the
1794 * constructor.
1795 */
1796 ProcessParams *pp = new ProcessParams();
1797 pp->executable = path;
1798 Addr argv_mem_loc = p->getSyscallArg(tc, index);
1799 read_in(pp->cmd, mem_proxy, argv_mem_loc);
1800 Addr envp_mem_loc = p->getSyscallArg(tc, index);
1801 read_in(pp->env, mem_proxy, envp_mem_loc);
1802 pp->uid = p->uid();
1803 pp->egid = p->egid();
1804 pp->euid = p->euid();
1805 pp->gid = p->gid();
1806 pp->ppid = p->ppid();
1807 pp->pid = p->pid();
1808 pp->input.assign("cin");
1809 pp->output.assign("cout");
1810 pp->errout.assign("cerr");
1811 pp->cwd.assign(p->getcwd());
1812 pp->system = p->system;
1813 /**
1814 * Prevent process object creation with identical PIDs (which will trip
1815 * a fatal check in Process constructor). The execve call is supposed to
1816 * take over the currently executing process' identity but replace
1817 * whatever it is doing with a new process image. Instead of hijacking
1818 * the process object in the simulator, we create a new process object
1819 * and bind to the previous process' thread below (hijacking the thread).
1820 */
1821 p->system->PIDs.erase(p->pid());
1822 Process *new_p = pp->create();
1823 delete pp;
1824
1825 /**
1826 * Work through the file descriptor array and close any files marked
1827 * close-on-exec.
1828 */
1829 new_p->fds = p->fds;
1830 for (int i = 0; i < new_p->fds->getSize(); i++) {
1831 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i];
1832 if (fdep && fdep->getCOE())
1833 new_p->fds->closeFDEntry(i);
1834 }
1835
1836 *new_p->sigchld = true;
1837
1838 delete p;
1839 tc->clearArchRegs();
1840 tc->setProcessPtr(new_p);
1841 new_p->assignThreadContext(tc->contextId());
1842 new_p->initState();
1843 tc->activate();
1844 TheISA::PCState pcState = tc->pcState();
1845 tc->setNPC(pcState.instAddr());
1846
1847 desc->setFlags(SyscallDesc::SuppressReturnValue);
1848 return 0;
1849}
1850
1851/// Target getrusage() function.
1852template <class OS>
1853SyscallReturn
1854getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
1855 ThreadContext *tc)
1856{
1857 int index = 0;
1858 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1859 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1860
1861 rup->ru_utime.tv_sec = 0;
1862 rup->ru_utime.tv_usec = 0;
1863 rup->ru_stime.tv_sec = 0;
1864 rup->ru_stime.tv_usec = 0;
1865 rup->ru_maxrss = 0;
1866 rup->ru_ixrss = 0;
1867 rup->ru_idrss = 0;
1868 rup->ru_isrss = 0;
1869 rup->ru_minflt = 0;
1870 rup->ru_majflt = 0;
1871 rup->ru_nswap = 0;
1872 rup->ru_inblock = 0;
1873 rup->ru_oublock = 0;
1874 rup->ru_msgsnd = 0;
1875 rup->ru_msgrcv = 0;
1876 rup->ru_nsignals = 0;
1877 rup->ru_nvcsw = 0;
1878 rup->ru_nivcsw = 0;
1879
1880 switch (who) {
1881 case OS::TGT_RUSAGE_SELF:
1882 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1883 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1884 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1885 break;
1886
1887 case OS::TGT_RUSAGE_CHILDREN:
1888 // do nothing. We have no child processes, so they take no time.
1889 break;
1890
1891 default:
1892 // don't really handle THREAD or CHILDREN, but just warn and
1893 // plow ahead
1894 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1895 who);
1896 }
1897
1898 rup.copyOut(tc->getMemProxy());
1899
1900 return 0;
1901}
1902
1903/// Target times() function.
1904template <class OS>
1905SyscallReturn
1906timesFunc(SyscallDesc *desc, int callnum, Process *process,
1907 ThreadContext *tc)
1908{
1909 int index = 0;
1910 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1911
1912 // Fill in the time structure (in clocks)
1913 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1914 bufp->tms_utime = clocks;
1915 bufp->tms_stime = 0;
1916 bufp->tms_cutime = 0;
1917 bufp->tms_cstime = 0;
1918
1919 // Convert to host endianness
1920 bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1921
1922 // Write back
1923 bufp.copyOut(tc->getMemProxy());
1924
1925 // Return clock ticks since system boot
1926 return clocks;
1927}
1928
1929/// Target time() function.
1930template <class OS>
1931SyscallReturn
1932timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
1933{
1934 typename OS::time_t sec, usec;
1935 getElapsedTimeMicro(sec, usec);
1936 sec += seconds_since_epoch;
1937
1938 int index = 0;
1939 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1940 if (taddr != 0) {
1941 typename OS::time_t t = sec;
1942 t = TheISA::htog(t);
1943 SETranslatingPortProxy &p = tc->getMemProxy();
1944 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1945 }
1946 return sec;
1947}
1948
1949template <class OS>
1950SyscallReturn
1951tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc)
1952{
1953 int index = 0;
1954 int tgid = process->getSyscallArg(tc, index);
1955 int tid = process->getSyscallArg(tc, index);
1956 int sig = process->getSyscallArg(tc, index);
1957
1958 /**
1959 * This system call is intended to allow killing a specific thread
1960 * within an arbitrary thread group if sanctioned with permission checks.
1961 * It's usually true that threads share the termination signal as pointed
1962 * out by the pthread_kill man page and this seems to be the intended
1963 * usage. Due to this being an emulated environment, assume the following:
1964 * Threads are allowed to call tgkill because the EUID for all threads
1965 * should be the same. There is no signal handling mechanism for kernel
1966 * registration of signal handlers since signals are poorly supported in
1967 * emulation mode. Since signal handlers cannot be registered, all
1968 * threads within in a thread group must share the termination signal.
1969 * We never exhaust PIDs so there's no chance of finding the wrong one
1970 * due to PID rollover.
1971 */
1972
1973 System *sys = tc->getSystemPtr();
1974 Process *tgt_proc = nullptr;
1975 for (int i = 0; i < sys->numContexts(); i++) {
1976 Process *temp = sys->threadContexts[i]->getProcessPtr();
1977 if (temp->pid() == tid) {
1978 tgt_proc = temp;
1979 break;
1980 }
1981 }
1982
1983 if (sig != 0 || sig != OS::TGT_SIGABRT)
1984 return -EINVAL;
1985
1986 if (tgt_proc == nullptr)
1987 return -ESRCH;
1988
1989 if (tgid != -1 && tgt_proc->tgid() != tgid)
1990 return -ESRCH;
1991
1992 if (sig == OS::TGT_SIGABRT)
1993 exitGroupFunc(desc, 252, process, tc);
1994
1995 return 0;
1996}
1997
1998
1999#endif // __SIM_SYSCALL_EMUL_HH__