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#if (defined(__APPLE__) || defined(__OpenBSD__) || \
49 defined(__FreeBSD__) || defined(__CYGWIN__) || \
50 defined(__NetBSD__))
51#define NO_STAT64 1
52#else
53#define NO_STAT64 0
54#endif
55
56#if (defined(__APPLE__) || defined(__OpenBSD__) || \
57 defined(__FreeBSD__) || defined(__NetBSD__))
58#define NO_STATFS 1
59#else
60#define NO_STATFS 0
61#endif
62
63#if (defined(__APPLE__) || defined(__OpenBSD__) || \
64 defined(__FreeBSD__) || defined(__NetBSD__))
65#define NO_FALLOCATE 1
66#else
67#define NO_FALLOCATE 0
68#endif
69
70///
71/// @file syscall_emul.hh
72///
73/// This file defines objects used to emulate syscalls from the target
74/// application on the host machine.
75
76#ifdef __CYGWIN32__
77#include <sys/fcntl.h>
78
79#endif
80#include <fcntl.h>
81#include <poll.h>
82#include <sys/mman.h>
83#include <sys/socket.h>
84#include <sys/stat.h>
85#if (NO_STATFS == 0)
86#include <sys/statfs.h>
87#else
88#include <sys/mount.h>
89#endif
90#include <sys/time.h>
91#include <sys/types.h>
92#include <sys/uio.h>
93#include <unistd.h>
94
95#include <cerrno>
96#include <memory>
97#include <string>
98
99#include "arch/generic/tlb.hh"
100#include "arch/utility.hh"
101#include "base/intmath.hh"
102#include "base/loader/object_file.hh"
103#include "base/logging.hh"
104#include "base/trace.hh"
105#include "base/types.hh"
106#include "config/the_isa.hh"
107#include "cpu/base.hh"
108#include "cpu/thread_context.hh"
109#include "mem/page_table.hh"
110#include "params/Process.hh"
111#include "sim/emul_driver.hh"
112#include "sim/futex_map.hh"
113#include "sim/process.hh"
114#include "sim/syscall_debug_macros.hh"
115#include "sim/syscall_desc.hh"
116#include "sim/syscall_emul_buf.hh"
117#include "sim/syscall_return.hh"
118
119//////////////////////////////////////////////////////////////////////
120//
121// The following emulation functions are generic enough that they
122// don't need to be recompiled for different emulated OS's. They are
123// defined in sim/syscall_emul.cc.
124//
125//////////////////////////////////////////////////////////////////////
126
127
128/// Handler for unimplemented syscalls that we haven't thought about.
129SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
130 Process *p, ThreadContext *tc);
131
132/// Handler for unimplemented syscalls that we never intend to
133/// implement (signal handling, etc.) and should not affect the correct
134/// behavior of the program. Print a warning only if the appropriate
135/// trace flag is enabled. Return success to the target program.
136SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
137 Process *p, ThreadContext *tc);
138
139// Target fallocateFunc() handler.
140SyscallReturn fallocateFunc(SyscallDesc *desc, int num,
141 Process *p, ThreadContext *tc);
142
143/// Target exit() handler: terminate current context.
144SyscallReturn exitFunc(SyscallDesc *desc, int num,
145 Process *p, ThreadContext *tc);
146
147/// Target exit_group() handler: terminate simulation. (exit all threads)
148SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
149 Process *p, ThreadContext *tc);
150
151/// Target set_tid_address() handler.
152SyscallReturn setTidAddressFunc(SyscallDesc *desc, int num,
153 Process *p, ThreadContext *tc);
154
155/// Target getpagesize() handler.
156SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
157 Process *p, ThreadContext *tc);
158
159/// Target brk() handler: set brk address.
160SyscallReturn brkFunc(SyscallDesc *desc, int num,
161 Process *p, ThreadContext *tc);
162
163/// Target close() handler.
164SyscallReturn closeFunc(SyscallDesc *desc, int num,
165 Process *p, ThreadContext *tc);
166
167/// Target lseek() handler.
168SyscallReturn lseekFunc(SyscallDesc *desc, int num,
169 Process *p, ThreadContext *tc);
170
171/// Target _llseek() handler.
172SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
173 Process *p, ThreadContext *tc);
174
175/// Target munmap() handler.
176SyscallReturn munmapFunc(SyscallDesc *desc, int num,
177 Process *p, ThreadContext *tc);
178
179/// Target shutdown() handler.
180SyscallReturn shutdownFunc(SyscallDesc *desc, int num,
181 Process *p, ThreadContext *tc);
182
183/// Target gethostname() handler.
184SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
185 Process *p, ThreadContext *tc);
186
187/// Target getcwd() handler.
188SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
189 Process *p, ThreadContext *tc);
190
191/// Target readlink() handler.
192SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
193 Process *p, ThreadContext *tc,
194 int index = 0);
195SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
196 Process *p, ThreadContext *tc);
197
198/// Target unlink() handler.
199SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
200 Process *p, ThreadContext *tc,
201 int index);
202SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
203 Process *p, ThreadContext *tc);
204
205/// Target link() handler
206SyscallReturn linkFunc(SyscallDesc *desc, int num, Process *p,
207 ThreadContext *tc);
208
209/// Target symlink() handler.
210SyscallReturn symlinkFunc(SyscallDesc *desc, int num, Process *p,
211 ThreadContext *tc);
212
213/// Target mkdir() handler.
214SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
215 Process *p, ThreadContext *tc);
216
217/// Target mknod() handler.
218SyscallReturn mknodFunc(SyscallDesc *desc, int num,
219 Process *p, ThreadContext *tc);
220
221/// Target chdir() handler.
222SyscallReturn chdirFunc(SyscallDesc *desc, int num,
223 Process *p, ThreadContext *tc);
224
225// Target rmdir() handler.
226SyscallReturn rmdirFunc(SyscallDesc *desc, int num,
227 Process *p, ThreadContext *tc);
228
229/// Target rename() handler.
230SyscallReturn renameFunc(SyscallDesc *desc, int num,
231 Process *p, ThreadContext *tc);
232
233
234/// Target truncate() handler.
235SyscallReturn truncateFunc(SyscallDesc *desc, int num,
236 Process *p, ThreadContext *tc);
237
238
239/// Target ftruncate() handler.
240SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
241 Process *p, ThreadContext *tc);
242
243
244/// Target truncate64() handler.
245SyscallReturn truncate64Func(SyscallDesc *desc, int num,
246 Process *p, ThreadContext *tc);
247
248/// Target ftruncate64() handler.
249SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
250 Process *p, ThreadContext *tc);
251
252
253/// Target umask() handler.
254SyscallReturn umaskFunc(SyscallDesc *desc, int num,
255 Process *p, ThreadContext *tc);
256
257/// Target gettid() handler.
258SyscallReturn gettidFunc(SyscallDesc *desc, int num,
259 Process *p, ThreadContext *tc);
260
261/// Target chown() handler.
262SyscallReturn chownFunc(SyscallDesc *desc, int num,
263 Process *p, ThreadContext *tc);
264
265/// Target setpgid() handler.
266SyscallReturn setpgidFunc(SyscallDesc *desc, int num,
267 Process *p, ThreadContext *tc);
268
269/// Target fchown() handler.
270SyscallReturn fchownFunc(SyscallDesc *desc, int num,
271 Process *p, ThreadContext *tc);
272
273/// Target dup() handler.
274SyscallReturn dupFunc(SyscallDesc *desc, int num,
275 Process *process, ThreadContext *tc);
276
277/// Target dup2() handler.
278SyscallReturn dup2Func(SyscallDesc *desc, int num,
279 Process *process, ThreadContext *tc);
280
281/// Target fcntl() handler.
282SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
283 Process *process, ThreadContext *tc);
284
285/// Target fcntl64() handler.
286SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
287 Process *process, ThreadContext *tc);
288
289/// Target setuid() handler.
290SyscallReturn setuidFunc(SyscallDesc *desc, int num,
291 Process *p, ThreadContext *tc);
292
293/// Target pipe() handler.
294SyscallReturn pipeFunc(SyscallDesc *desc, int num,
295 Process *p, ThreadContext *tc);
296
297/// Internal pipe() handler.
298SyscallReturn pipeImpl(SyscallDesc *desc, int num, Process *p,
299 ThreadContext *tc, bool pseudoPipe);
300
301/// Target getpid() handler.
302SyscallReturn getpidFunc(SyscallDesc *desc, int num,
303 Process *p, ThreadContext *tc);
304
305// Target bind() handler.
306SyscallReturn bindFunc(SyscallDesc *desc, int num,
307 Process *p, ThreadContext *tc);
308
309// Target listen() handler.
310SyscallReturn listenFunc(SyscallDesc *desc, int num,
311 Process *p, ThreadContext *tc);
312
313// Target connect() handler.
314SyscallReturn connectFunc(SyscallDesc *desc, int num,
315 Process *p, ThreadContext *tc);
316
317#if defined(SYS_getdents)
318// Target getdents() handler.
319SyscallReturn getdentsFunc(SyscallDesc *desc, int num,
320 Process *p, ThreadContext *tc);
321#endif
322
323#if defined(SYS_getdents64)
324// Target getdents() handler.
325SyscallReturn getdents64Func(SyscallDesc *desc, int num,
326 Process *p, ThreadContext *tc);
327#endif
328
329// Target sendto() handler.
330SyscallReturn sendtoFunc(SyscallDesc *desc, int num,
331 Process *p, ThreadContext *tc);
332
333// Target recvfrom() handler.
334SyscallReturn recvfromFunc(SyscallDesc *desc, int num,
335 Process *p, ThreadContext *tc);
336
337// Target recvmsg() handler.
338SyscallReturn recvmsgFunc(SyscallDesc *desc, int num,
339 Process *p, ThreadContext *tc);
340
341// Target sendmsg() handler.
342SyscallReturn sendmsgFunc(SyscallDesc *desc, int num,
343 Process *p, ThreadContext *tc);
344
345// Target getuid() handler.
346SyscallReturn getuidFunc(SyscallDesc *desc, int num,
347 Process *p, ThreadContext *tc);
348
349/// Target getgid() handler.
350SyscallReturn getgidFunc(SyscallDesc *desc, int num,
351 Process *p, ThreadContext *tc);
352
353/// Target getppid() handler.
354SyscallReturn getppidFunc(SyscallDesc *desc, int num,
355 Process *p, ThreadContext *tc);
356
357/// Target geteuid() handler.
358SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
359 Process *p, ThreadContext *tc);
360
361/// Target getegid() handler.
362SyscallReturn getegidFunc(SyscallDesc *desc, int num,
363 Process *p, ThreadContext *tc);
364
365/// Target access() handler
366SyscallReturn accessFunc(SyscallDesc *desc, int num,
367 Process *p, ThreadContext *tc);
368SyscallReturn accessFunc(SyscallDesc *desc, int num,
369 Process *p, ThreadContext *tc,
370 int index);
371
372/// Futex system call
373/// Implemented by Daniel Sanchez
374/// Used by printf's in multi-threaded apps
375template <class OS>
376SyscallReturn
377futexFunc(SyscallDesc *desc, int callnum, Process *process,
378 ThreadContext *tc)
379{
380 using namespace std;
381
382 int index = 0;
383 Addr uaddr = process->getSyscallArg(tc, index);
384 int op = process->getSyscallArg(tc, index);
385 int val = process->getSyscallArg(tc, index);
386
387 /*
388 * Unsupported option that does not affect the correctness of the
389 * application. This is a performance optimization utilized by Linux.
390 */
391 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
392
393 FutexMap &futex_map = tc->getSystemPtr()->futexMap;
394
395 if (OS::TGT_FUTEX_WAIT == op) {
396 // Ensure futex system call accessed atomically.
397 BufferArg buf(uaddr, sizeof(int));
398 buf.copyIn(tc->getMemProxy());
399 int mem_val = *(int*)buf.bufferPtr();
400
401 /*
402 * The value in memory at uaddr is not equal with the expected val
403 * (a different thread must have changed it before the system call was
404 * invoked). In this case, we need to throw an error.
405 */
406 if (val != mem_val)
407 return -OS::TGT_EWOULDBLOCK;
408
409 futex_map.suspend(uaddr, process->tgid(), tc);
410
411 return 0;
412 } else if (OS::TGT_FUTEX_WAKE == op) {
413 return futex_map.wakeup(uaddr, process->tgid(), val);
414 }
415
416 warn("futex: op %d not implemented; ignoring.", op);
417 return -ENOSYS;
418}
419
420
421/// Pseudo Funcs - These functions use a different return convension,
422/// returning a second value in a register other than the normal return register
423SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
424 Process *process, ThreadContext *tc);
425
426/// Target getpidPseudo() handler.
427SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
428 Process *p, ThreadContext *tc);
429
430/// Target getuidPseudo() handler.
431SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
432 Process *p, ThreadContext *tc);
433
434/// Target getgidPseudo() handler.
435SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
436 Process *p, ThreadContext *tc);
437
438
439/// A readable name for 1,000,000, for converting microseconds to seconds.
440const int one_million = 1000000;
441/// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
442const int one_billion = 1000000000;
443
444/// Approximate seconds since the epoch (1/1/1970). About a billion,
445/// by my reckoning. We want to keep this a constant (not use the
446/// real-world time) to keep simulations repeatable.
447const unsigned seconds_since_epoch = 1000000000;
448
449/// Helper function to convert current elapsed time to seconds and
450/// microseconds.
451template <class T1, class T2>
452void
453getElapsedTimeMicro(T1 &sec, T2 &usec)
454{
455 uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
456 sec = elapsed_usecs / one_million;
457 usec = elapsed_usecs % one_million;
458}
459
460/// Helper function to convert current elapsed time to seconds and
461/// nanoseconds.
462template <class T1, class T2>
463void
464getElapsedTimeNano(T1 &sec, T2 &nsec)
465{
466 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
467 sec = elapsed_nsecs / one_billion;
468 nsec = elapsed_nsecs % one_billion;
469}
470
471//////////////////////////////////////////////////////////////////////
472//
473// The following emulation functions are generic, but need to be
474// templated to account for differences in types, constants, etc.
475//
476//////////////////////////////////////////////////////////////////////
477
478 typedef struct statfs hst_statfs;
479#if NO_STAT64
480 typedef struct stat hst_stat;
481 typedef struct stat hst_stat64;
482#else
483 typedef struct stat hst_stat;
484 typedef struct stat64 hst_stat64;
485#endif
486
487//// Helper function to convert a host stat buffer to a target stat
488//// buffer. Also copies the target buffer out to the simulated
489//// memory space. Used by stat(), fstat(), and lstat().
490
491template <typename target_stat, typename host_stat>
492void
493convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
494{
495 using namespace TheISA;
496
497 if (fakeTTY)
498 tgt->st_dev = 0xA;
499 else
500 tgt->st_dev = host->st_dev;
501 tgt->st_dev = TheISA::htog(tgt->st_dev);
502 tgt->st_ino = host->st_ino;
503 tgt->st_ino = TheISA::htog(tgt->st_ino);
504 tgt->st_mode = host->st_mode;
505 if (fakeTTY) {
506 // Claim to be a character device
507 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
508 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
509 }
510 tgt->st_mode = TheISA::htog(tgt->st_mode);
511 tgt->st_nlink = host->st_nlink;
512 tgt->st_nlink = TheISA::htog(tgt->st_nlink);
513 tgt->st_uid = host->st_uid;
514 tgt->st_uid = TheISA::htog(tgt->st_uid);
515 tgt->st_gid = host->st_gid;
516 tgt->st_gid = TheISA::htog(tgt->st_gid);
517 if (fakeTTY)
518 tgt->st_rdev = 0x880d;
519 else
520 tgt->st_rdev = host->st_rdev;
521 tgt->st_rdev = TheISA::htog(tgt->st_rdev);
522 tgt->st_size = host->st_size;
523 tgt->st_size = TheISA::htog(tgt->st_size);
524 tgt->st_atimeX = host->st_atime;
525 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
526 tgt->st_mtimeX = host->st_mtime;
527 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
528 tgt->st_ctimeX = host->st_ctime;
529 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
530 // Force the block size to be 8KB. This helps to ensure buffered io works
531 // consistently across different hosts.
532 tgt->st_blksize = 0x2000;
533 tgt->st_blksize = TheISA::htog(tgt->st_blksize);
534 tgt->st_blocks = host->st_blocks;
535 tgt->st_blocks = TheISA::htog(tgt->st_blocks);
536}
537
538// Same for stat64
539
540template <typename target_stat, typename host_stat64>
541void
542convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
543{
544 using namespace TheISA;
545
546 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
547#if defined(STAT_HAVE_NSEC)
548 tgt->st_atime_nsec = host->st_atime_nsec;
549 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
550 tgt->st_mtime_nsec = host->st_mtime_nsec;
551 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
552 tgt->st_ctime_nsec = host->st_ctime_nsec;
553 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
554#else
555 tgt->st_atime_nsec = 0;
556 tgt->st_mtime_nsec = 0;
557 tgt->st_ctime_nsec = 0;
558#endif
559}
560
561// Here are a couple of convenience functions
562template<class OS>
563void
564copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
565 hst_stat *host, bool fakeTTY = false)
566{
567 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
568 tgt_stat_buf tgt(addr);
569 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
570 tgt.copyOut(mem);
571}
572
573template<class OS>
574void
575copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
576 hst_stat64 *host, bool fakeTTY = false)
577{
578 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
579 tgt_stat_buf tgt(addr);
580 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
581 tgt.copyOut(mem);
582}
583
584template <class OS>
585void
586copyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr,
587 hst_statfs *host)
588{
589 TypedBufferArg<typename OS::tgt_statfs> tgt(addr);
590
591 tgt->f_type = TheISA::htog(host->f_type);
592#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
593 tgt->f_bsize = TheISA::htog(host->f_iosize);
594#else
595 tgt->f_bsize = TheISA::htog(host->f_bsize);
596#endif
597 tgt->f_blocks = TheISA::htog(host->f_blocks);
598 tgt->f_bfree = TheISA::htog(host->f_bfree);
599 tgt->f_bavail = TheISA::htog(host->f_bavail);
600 tgt->f_files = TheISA::htog(host->f_files);
601 tgt->f_ffree = TheISA::htog(host->f_ffree);
602 memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid));
603#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
604 tgt->f_namelen = TheISA::htog(host->f_namemax);
605 tgt->f_frsize = TheISA::htog(host->f_bsize);
606#elif defined(__APPLE__)
607 tgt->f_namelen = 0;
608 tgt->f_frsize = 0;
609#else
610 tgt->f_namelen = TheISA::htog(host->f_namelen);
611 tgt->f_frsize = TheISA::htog(host->f_frsize);
612#endif
613#if defined(__linux__)
614 memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare));
615#else
616 /*
617 * The fields are different sizes per OS. Don't bother with
618 * f_spare or f_reserved on non-Linux for now.
619 */
620 memset(&tgt->f_spare, 0, sizeof(tgt->f_spare));
621#endif
622
623 tgt.copyOut(mem);
624}
625
626/// Target ioctl() handler. For the most part, programs call ioctl()
627/// only to find out if their stdout is a tty, to determine whether to
628/// do line or block buffering. We always claim that output fds are
629/// not TTYs to provide repeatable results.
630template <class OS>
631SyscallReturn
632ioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
633{
634 int index = 0;
635 int tgt_fd = p->getSyscallArg(tc, index);
636 unsigned req = p->getSyscallArg(tc, index);
637
638 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req);
639
640 if (OS::isTtyReq(req))
641 return -ENOTTY;
642
643 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]);
644 if (!dfdp)
645 return -EBADF;
646
647 /**
648 * If the driver is valid, issue the ioctl through it. Otherwise,
649 * there's an implicit assumption that the device is a TTY type and we
650 * return that we do not have a valid TTY.
651 */
652 EmulatedDriver *emul_driver = dfdp->getDriver();
653 if (emul_driver)
654 return emul_driver->ioctl(p, tc, req);
655
656 /**
657 * For lack of a better return code, return ENOTTY. Ideally, we should
658 * return something better here, but at least we issue the warning.
659 */
660 warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n",
661 tgt_fd, req, tc->pcState());
662 return -ENOTTY;
663}
664
665template <class OS>
666SyscallReturn
667openImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc,
668 bool isopenat)
669{
670 int index = 0;
671 int tgt_dirfd = -1;
672
673 /**
674 * If using the openat variant, read in the target directory file
675 * descriptor from the simulated process.
676 */
677 if (isopenat)
678 tgt_dirfd = p->getSyscallArg(tc, index);
679
680 /**
681 * Retrieve the simulated process' memory proxy and then read in the path
682 * string from that memory space into the host's working memory space.
683 */
684 std::string path;
685 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
686 return -EFAULT;
687
688#ifdef __CYGWIN32__
689 int host_flags = O_BINARY;
690#else
691 int host_flags = 0;
692#endif
693 /**
694 * Translate target flags into host flags. Flags exist which are not
695 * ported between architectures which can cause check failures.
696 */
697 int tgt_flags = p->getSyscallArg(tc, index);
698 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
699 if (tgt_flags & OS::openFlagTable[i].tgtFlag) {
700 tgt_flags &= ~OS::openFlagTable[i].tgtFlag;
701 host_flags |= OS::openFlagTable[i].hostFlag;
702 }
703 }
704 if (tgt_flags) {
705 warn("open%s: cannot decode flags 0x%x",
706 isopenat ? "at" : "", tgt_flags);
707 }
708#ifdef __CYGWIN32__
709 host_flags |= O_BINARY;
710#endif
711
712 int mode = p->getSyscallArg(tc, index);
713
714 /**
715 * If the simulated process called open or openat with AT_FDCWD specified,
716 * take the current working directory value which was passed into the
717 * process class as a Python parameter and append the current path to
718 * create a full path.
719 * Otherwise, openat with a valid target directory file descriptor has
720 * been called. If the path option, which was passed in as a parameter,
721 * is not absolute, retrieve the directory file descriptor's path and
722 * prepend it to the path passed in as a parameter.
723 * In every case, we should have a full path (which is relevant to the
724 * host) to work with after this block has been passed.
725 */
726 if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) {
727 path = p->fullPath(path);
728 } else if (!startswith(path, "/")) {
729 std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]);
730 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep);
731 if (!ffdp)
732 return -EBADF;
733 path.insert(0, ffdp->getFileName() + "/");
734 }
735
736 /**
737 * Since this is an emulated environment, we create pseudo file
738 * descriptors for device requests that have been registered with
739 * the process class through Python; this allows us to create a file
740 * descriptor for subsequent ioctl or mmap calls.
741 */
742 if (startswith(path, "/dev/")) {
743 std::string filename = path.substr(strlen("/dev/"));
744 EmulatedDriver *drv = p->findDriver(filename);
745 if (drv) {
746 DPRINTF_SYSCALL(Verbose, "open%s: passing call to "
747 "driver open with path[%s]\n",
748 isopenat ? "at" : "", path.c_str());
749 return drv->open(p, tc, mode, host_flags);
750 }
751 /**
752 * Fall through here for pass through to host devices, such
753 * as /dev/zero
754 */
755 }
756
757 /**
758 * Some special paths and files cannot be called on the host and need
759 * to be handled as special cases inside the simulator.
760 * If the full path that was created above does not match any of the
761 * special cases, pass it through to the open call on the host to let
762 * the host open the file on our behalf.
763 * If the host cannot open the file, return the host's error code back
764 * through the system call to the simulated process.
765 */
766 int sim_fd = -1;
767 std::vector<std::string> special_paths =
768 { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" };
769 for (auto entry : special_paths) {
770 if (startswith(path, entry))
771 sim_fd = OS::openSpecialFile(path, p, tc);
772 }
773 if (sim_fd == -1) {
774 sim_fd = open(path.c_str(), host_flags, mode);
775 }
776 if (sim_fd == -1) {
777 int local = -errno;
778 DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n",
779 isopenat ? "at" : "", path.c_str());
780 return local;
781 }
782
783 /**
784 * The file was opened successfully and needs to be recorded in the
785 * process' file descriptor array so that it can be retrieved later.
786 * The target file descriptor that is chosen will be the lowest unused
787 * file descriptor.
788 * Return the indirect target file descriptor back to the simulated
789 * process to act as a handle for the opened file.
790 */
791 auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0);
792 int tgt_fd = p->fds->allocFD(ffdp);
793 DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n",
794 isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str());
795 return tgt_fd;
796}
797
798/// Target open() handler.
799template <class OS>
800SyscallReturn
801openFunc(SyscallDesc *desc, int callnum, Process *process,
802 ThreadContext *tc)
803{
804 return openImpl<OS>(desc, callnum, process, tc, false);
805}
806
807/// Target openat() handler.
808template <class OS>
809SyscallReturn
810openatFunc(SyscallDesc *desc, int callnum, Process *process,
811 ThreadContext *tc)
812{
813 return openImpl<OS>(desc, callnum, process, tc, true);
814}
815
816/// Target unlinkat() handler.
817template <class OS>
818SyscallReturn
819unlinkatFunc(SyscallDesc *desc, int callnum, Process *process,
820 ThreadContext *tc)
821{
822 int index = 0;
823 int dirfd = process->getSyscallArg(tc, index);
824 if (dirfd != OS::TGT_AT_FDCWD)
825 warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
826
827 return unlinkHelper(desc, callnum, process, tc, 1);
828}
829
830/// Target facessat() handler
831template <class OS>
832SyscallReturn
833faccessatFunc(SyscallDesc *desc, int callnum, Process *process,
834 ThreadContext *tc)
835{
836 int index = 0;
837 int dirfd = process->getSyscallArg(tc, index);
838 if (dirfd != OS::TGT_AT_FDCWD)
839 warn("faccessat: first argument not AT_FDCWD; unlikely to work");
840 return accessFunc(desc, callnum, process, tc, 1);
841}
842
843/// Target readlinkat() handler
844template <class OS>
845SyscallReturn
846readlinkatFunc(SyscallDesc *desc, int callnum, Process *process,
847 ThreadContext *tc)
848{
849 int index = 0;
850 int dirfd = process->getSyscallArg(tc, index);
851 if (dirfd != OS::TGT_AT_FDCWD)
852 warn("openat: first argument not AT_FDCWD; unlikely to work");
853 return readlinkFunc(desc, callnum, process, tc, 1);
854}
855
856/// Target renameat() handler.
857template <class OS>
858SyscallReturn
859renameatFunc(SyscallDesc *desc, int callnum, Process *process,
860 ThreadContext *tc)
861{
862 int index = 0;
863
864 int olddirfd = process->getSyscallArg(tc, index);
865 if (olddirfd != OS::TGT_AT_FDCWD)
866 warn("renameat: first argument not AT_FDCWD; unlikely to work");
867
868 std::string old_name;
869
870 if (!tc->getMemProxy().tryReadString(old_name,
871 process->getSyscallArg(tc, index)))
872 return -EFAULT;
873
874 int newdirfd = process->getSyscallArg(tc, index);
875 if (newdirfd != OS::TGT_AT_FDCWD)
876 warn("renameat: third argument not AT_FDCWD; unlikely to work");
877
878 std::string new_name;
879
880 if (!tc->getMemProxy().tryReadString(new_name,
881 process->getSyscallArg(tc, index)))
882 return -EFAULT;
883
884 // Adjust path for current working directory
885 old_name = process->fullPath(old_name);
886 new_name = process->fullPath(new_name);
887
888 int result = rename(old_name.c_str(), new_name.c_str());
889 return (result == -1) ? -errno : result;
890}
891
892/// Target sysinfo() handler.
893template <class OS>
894SyscallReturn
895sysinfoFunc(SyscallDesc *desc, int callnum, Process *process,
896 ThreadContext *tc)
897{
898
899 int index = 0;
900 TypedBufferArg<typename OS::tgt_sysinfo>
901 sysinfo(process->getSyscallArg(tc, index));
902
903 sysinfo->uptime = seconds_since_epoch;
904 sysinfo->totalram = process->system->memSize();
905 sysinfo->mem_unit = 1;
906
907 sysinfo.copyOut(tc->getMemProxy());
908
909 return 0;
910}
911
912/// Target chmod() handler.
913template <class OS>
914SyscallReturn
915chmodFunc(SyscallDesc *desc, int callnum, Process *process,
916 ThreadContext *tc)
917{
918 std::string path;
919
920 int index = 0;
921 if (!tc->getMemProxy().tryReadString(path,
922 process->getSyscallArg(tc, index))) {
923 return -EFAULT;
924 }
925
926 uint32_t mode = process->getSyscallArg(tc, index);
927 mode_t hostMode = 0;
928
929 // XXX translate mode flags via OS::something???
930 hostMode = mode;
931
932 // Adjust path for current working directory
933 path = process->fullPath(path);
934
935 // do the chmod
936 int result = chmod(path.c_str(), hostMode);
937 if (result < 0)
938 return -errno;
939
940 return 0;
941}
942
943template <class OS>
944SyscallReturn
945pollFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
946{
947 int index = 0;
948 Addr fdsPtr = p->getSyscallArg(tc, index);
949 int nfds = p->getSyscallArg(tc, index);
950 int tmout = p->getSyscallArg(tc, index);
951
952 BufferArg fdsBuf(fdsPtr, sizeof(struct pollfd) * nfds);
953 fdsBuf.copyIn(tc->getMemProxy());
954
955 /**
956 * Record the target file descriptors in a local variable. We need to
957 * replace them with host file descriptors but we need a temporary copy
958 * for later. Afterwards, replace each target file descriptor in the
959 * poll_fd array with its host_fd.
960 */
961 int temp_tgt_fds[nfds];
962 for (index = 0; index < nfds; index++) {
963 temp_tgt_fds[index] = ((struct pollfd *)fdsBuf.bufferPtr())[index].fd;
964 auto tgt_fd = temp_tgt_fds[index];
965 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
966 if (!hbfdp)
967 return -EBADF;
968 auto host_fd = hbfdp->getSimFD();
969 ((struct pollfd *)fdsBuf.bufferPtr())[index].fd = host_fd;
970 }
971
972 /**
973 * We cannot allow an infinite poll to occur or it will inevitably cause
974 * a deadlock in the gem5 simulator with clone. We must pass in tmout with
975 * a non-negative value, however it also makes no sense to poll on the
976 * underlying host for any other time than tmout a zero timeout.
977 */
978 int status;
979 if (tmout < 0) {
980 status = poll((struct pollfd *)fdsBuf.bufferPtr(), nfds, 0);
981 if (status == 0) {
982 /**
983 * If blocking indefinitely, check the signal list to see if a
984 * signal would break the poll out of the retry cycle and try
985 * to return the signal interrupt instead.
986 */
987 System *sysh = tc->getSystemPtr();
988 std::list<BasicSignal>::iterator it;
989 for (it=sysh->signalList.begin(); it!=sysh->signalList.end(); it++)
990 if (it->receiver == p)
991 return -EINTR;
992 return SyscallReturn::retry();
993 }
994 } else
995 status = poll((struct pollfd *)fdsBuf.bufferPtr(), nfds, 0);
996
997 if (status == -1)
998 return -errno;
999
1000 /**
1001 * Replace each host_fd in the returned poll_fd array with its original
1002 * target file descriptor.
1003 */
1004 for (index = 0; index < nfds; index++) {
1005 auto tgt_fd = temp_tgt_fds[index];
1006 ((struct pollfd *)fdsBuf.bufferPtr())[index].fd = tgt_fd;
1007 }
1008
1009 /**
1010 * Copy out the pollfd struct because the host may have updated fields
1011 * in the structure.
1012 */
1013 fdsBuf.copyOut(tc->getMemProxy());
1014
1015 return status;
1016}
1017
1018/// Target fchmod() handler.
1019template <class OS>
1020SyscallReturn
1021fchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1022{
1023 int index = 0;
1024 int tgt_fd = p->getSyscallArg(tc, index);
1025 uint32_t mode = p->getSyscallArg(tc, index);
1026
1027 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1028 if (!ffdp)
1029 return -EBADF;
1030 int sim_fd = ffdp->getSimFD();
1031
1032 mode_t hostMode = mode;
1033
1034 int result = fchmod(sim_fd, hostMode);
1035
1036 return (result < 0) ? -errno : 0;
1037}
1038
1039/// Target mremap() handler.
1040template <class OS>
1041SyscallReturn
1042mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
1043{
1044 int index = 0;
1045 Addr start = process->getSyscallArg(tc, index);
1046 uint64_t old_length = process->getSyscallArg(tc, index);
1047 uint64_t new_length = process->getSyscallArg(tc, index);
1048 uint64_t flags = process->getSyscallArg(tc, index);
1049 uint64_t provided_address = 0;
1050 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
1051
1052 if (use_provided_address)
1053 provided_address = process->getSyscallArg(tc, index);
1054
1055 if ((start % TheISA::PageBytes != 0) ||
1056 (provided_address % TheISA::PageBytes != 0)) {
1057 warn("mremap failing: arguments not page aligned");
1058 return -EINVAL;
1059 }
1060
1061 new_length = roundUp(new_length, TheISA::PageBytes);
1062
1063 if (new_length > old_length) {
1064 std::shared_ptr<MemState> mem_state = process->memState;
1065 Addr mmap_end = mem_state->getMmapEnd();
1066
1067 if ((start + old_length) == mmap_end &&
1068 (!use_provided_address || provided_address == start)) {
1069 // This case cannot occur when growing downward, as
1070 // start is greater than or equal to mmap_end.
1071 uint64_t diff = new_length - old_length;
1072 process->allocateMem(mmap_end, diff);
1073 mem_state->setMmapEnd(mmap_end + diff);
1074 return start;
1075 } else {
1076 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
1077 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
1078 return -ENOMEM;
1079 } else {
1080 uint64_t new_start = provided_address;
1081 if (!use_provided_address) {
1082 new_start = process->mmapGrowsDown() ?
1083 mmap_end - new_length : mmap_end;
1084 mmap_end = process->mmapGrowsDown() ?
1085 new_start : mmap_end + new_length;
1086 mem_state->setMmapEnd(mmap_end);
1087 }
1088
1089 process->pTable->remap(start, old_length, new_start);
1090 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
1091 new_start, new_start + new_length,
1092 new_length - old_length);
1093 // add on the remaining unallocated pages
1094 process->allocateMem(new_start + old_length,
1095 new_length - old_length,
1096 use_provided_address /* clobber */);
1097 if (use_provided_address &&
1098 ((new_start + new_length > mem_state->getMmapEnd() &&
1099 !process->mmapGrowsDown()) ||
1100 (new_start < mem_state->getMmapEnd() &&
1101 process->mmapGrowsDown()))) {
1102 // something fishy going on here, at least notify the user
1103 // @todo: increase mmap_end?
1104 warn("mmap region limit exceeded with MREMAP_FIXED\n");
1105 }
1106 warn("returning %08p as start\n", new_start);
1107 return new_start;
1108 }
1109 }
1110 } else {
1111 if (use_provided_address && provided_address != start)
1112 process->pTable->remap(start, new_length, provided_address);
1113 process->pTable->unmap(start + new_length, old_length - new_length);
1114 return use_provided_address ? provided_address : start;
1115 }
1116}
1117
1118/// Target stat() handler.
1119template <class OS>
1120SyscallReturn
1121statFunc(SyscallDesc *desc, int callnum, Process *process,
1122 ThreadContext *tc)
1123{
1124 std::string path;
1125
1126 int index = 0;
1127 if (!tc->getMemProxy().tryReadString(path,
1128 process->getSyscallArg(tc, index))) {
1129 return -EFAULT;
1130 }
1131 Addr bufPtr = process->getSyscallArg(tc, index);
1132
1133 // Adjust path for current working directory
1134 path = process->fullPath(path);
1135
1136 struct stat hostBuf;
1137 int result = stat(path.c_str(), &hostBuf);
1138
1139 if (result < 0)
1140 return -errno;
1141
1142 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1143
1144 return 0;
1145}
1146
1147
1148/// Target stat64() handler.
1149template <class OS>
1150SyscallReturn
1151stat64Func(SyscallDesc *desc, int callnum, Process *process,
1152 ThreadContext *tc)
1153{
1154 std::string path;
1155
1156 int index = 0;
1157 if (!tc->getMemProxy().tryReadString(path,
1158 process->getSyscallArg(tc, index)))
1159 return -EFAULT;
1160 Addr bufPtr = process->getSyscallArg(tc, index);
1161
1162 // Adjust path for current working directory
1163 path = process->fullPath(path);
1164
1165#if NO_STAT64
1166 struct stat hostBuf;
1167 int result = stat(path.c_str(), &hostBuf);
1168#else
1169 struct stat64 hostBuf;
1170 int result = stat64(path.c_str(), &hostBuf);
1171#endif
1172
1173 if (result < 0)
1174 return -errno;
1175
1176 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1177
1178 return 0;
1179}
1180
1181
1182/// Target fstatat64() handler.
1183template <class OS>
1184SyscallReturn
1185fstatat64Func(SyscallDesc *desc, int callnum, Process *process,
1186 ThreadContext *tc)
1187{
1188 int index = 0;
1189 int dirfd = process->getSyscallArg(tc, index);
1190 if (dirfd != OS::TGT_AT_FDCWD)
1191 warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
1192
1193 std::string path;
1194 if (!tc->getMemProxy().tryReadString(path,
1195 process->getSyscallArg(tc, index)))
1196 return -EFAULT;
1197 Addr bufPtr = process->getSyscallArg(tc, index);
1198
1199 // Adjust path for current working directory
1200 path = process->fullPath(path);
1201
1202#if NO_STAT64
1203 struct stat hostBuf;
1204 int result = stat(path.c_str(), &hostBuf);
1205#else
1206 struct stat64 hostBuf;
1207 int result = stat64(path.c_str(), &hostBuf);
1208#endif
1209
1210 if (result < 0)
1211 return -errno;
1212
1213 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1214
1215 return 0;
1216}
1217
1218
1219/// Target fstat64() handler.
1220template <class OS>
1221SyscallReturn
1222fstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1223{
1224 int index = 0;
1225 int tgt_fd = p->getSyscallArg(tc, index);
1226 Addr bufPtr = p->getSyscallArg(tc, index);
1227
1228 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1229 if (!ffdp)
1230 return -EBADF;
1231 int sim_fd = ffdp->getSimFD();
1232
1233#if NO_STAT64
1234 struct stat hostBuf;
1235 int result = fstat(sim_fd, &hostBuf);
1236#else
1237 struct stat64 hostBuf;
1238 int result = fstat64(sim_fd, &hostBuf);
1239#endif
1240
1241 if (result < 0)
1242 return -errno;
1243
1244 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1245
1246 return 0;
1247}
1248
1249
1250/// Target lstat() handler.
1251template <class OS>
1252SyscallReturn
1253lstatFunc(SyscallDesc *desc, int callnum, Process *process,
1254 ThreadContext *tc)
1255{
1256 std::string path;
1257
1258 int index = 0;
1259 if (!tc->getMemProxy().tryReadString(path,
1260 process->getSyscallArg(tc, index))) {
1261 return -EFAULT;
1262 }
1263 Addr bufPtr = process->getSyscallArg(tc, index);
1264
1265 // Adjust path for current working directory
1266 path = process->fullPath(path);
1267
1268 struct stat hostBuf;
1269 int result = lstat(path.c_str(), &hostBuf);
1270
1271 if (result < 0)
1272 return -errno;
1273
1274 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1275
1276 return 0;
1277}
1278
1279/// Target lstat64() handler.
1280template <class OS>
1281SyscallReturn
1282lstat64Func(SyscallDesc *desc, int callnum, Process *process,
1283 ThreadContext *tc)
1284{
1285 std::string path;
1286
1287 int index = 0;
1288 if (!tc->getMemProxy().tryReadString(path,
1289 process->getSyscallArg(tc, index))) {
1290 return -EFAULT;
1291 }
1292 Addr bufPtr = process->getSyscallArg(tc, index);
1293
1294 // Adjust path for current working directory
1295 path = process->fullPath(path);
1296
1297#if NO_STAT64
1298 struct stat hostBuf;
1299 int result = lstat(path.c_str(), &hostBuf);
1300#else
1301 struct stat64 hostBuf;
1302 int result = lstat64(path.c_str(), &hostBuf);
1303#endif
1304
1305 if (result < 0)
1306 return -errno;
1307
1308 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1309
1310 return 0;
1311}
1312
1313/// Target fstat() handler.
1314template <class OS>
1315SyscallReturn
1316fstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1317{
1318 int index = 0;
1319 int tgt_fd = p->getSyscallArg(tc, index);
1320 Addr bufPtr = p->getSyscallArg(tc, index);
1321
1322 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd);
1323
1324 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1325 if (!ffdp)
1326 return -EBADF;
1327 int sim_fd = ffdp->getSimFD();
1328
1329 struct stat hostBuf;
1330 int result = fstat(sim_fd, &hostBuf);
1331
1332 if (result < 0)
1333 return -errno;
1334
1335 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1336
1337 return 0;
1338}
1339
1340/// Target statfs() handler.
1341template <class OS>
1342SyscallReturn
1343statfsFunc(SyscallDesc *desc, int callnum, Process *process,
1344 ThreadContext *tc)
1345{
1346#if NO_STATFS
1347 warn("Host OS cannot support calls to statfs. Ignoring syscall");
1348#else
1349 std::string path;
1350
1351 int index = 0;
1352 if (!tc->getMemProxy().tryReadString(path,
1353 process->getSyscallArg(tc, index))) {
1354 return -EFAULT;
1355 }
1356 Addr bufPtr = process->getSyscallArg(tc, index);
1357
1358 // Adjust path for current working directory
1359 path = process->fullPath(path);
1360
1361 struct statfs hostBuf;
1362 int result = statfs(path.c_str(), &hostBuf);
1363
1364 if (result < 0)
1365 return -errno;
1366
1367 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1368#endif
1369 return 0;
1370}
1371
1372template <class OS>
1373SyscallReturn
1374cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1375{
1376 int index = 0;
1377
1378 RegVal flags = p->getSyscallArg(tc, index);
1379 RegVal newStack = p->getSyscallArg(tc, index);
1380 Addr ptidPtr = p->getSyscallArg(tc, index);
1381
1382#if THE_ISA == RISCV_ISA or THE_ISA == ARM_ISA
1383 /**
1384 * Linux sets CLONE_BACKWARDS flag for RISC-V and Arm.
1385 * The flag defines the list of clone() arguments in the following
1386 * order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr
1387 */
1388 Addr tlsPtr = p->getSyscallArg(tc, index);
1389 Addr ctidPtr = p->getSyscallArg(tc, index);
1390#else
1391 Addr ctidPtr = p->getSyscallArg(tc, index);
1392 Addr tlsPtr = p->getSyscallArg(tc, index);
1393#endif
1394
1395 if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) ||
1396 ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) ||
1397 ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) ||
1398 ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) ||
1399 ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) ||
1400 ((flags & OS::TGT_CLONE_VM) && !(newStack)))
1401 return -EINVAL;
1402
1403 ThreadContext *ctc;
1404 if (!(ctc = p->findFreeContext()))
1405 fatal("clone: no spare thread context in system");
1406
1407 /**
1408 * Note that ProcessParams is generated by swig and there are no other
1409 * examples of how to create anything but this default constructor. The
1410 * fields are manually initialized instead of passing parameters to the
1411 * constructor.
1412 */
1413 ProcessParams *pp = new ProcessParams();
1414 pp->executable.assign(*(new std::string(p->progName())));
1415 pp->cmd.push_back(*(new std::string(p->progName())));
1416 pp->system = p->system;
1417 pp->cwd.assign(p->getcwd());
1418 pp->input.assign("stdin");
1419 pp->output.assign("stdout");
1420 pp->errout.assign("stderr");
1421 pp->uid = p->uid();
1422 pp->euid = p->euid();
1423 pp->gid = p->gid();
1424 pp->egid = p->egid();
1425
1426 /* Find the first free PID that's less than the maximum */
1427 std::set<int> const& pids = p->system->PIDs;
1428 int temp_pid = *pids.begin();
1429 do {
1430 temp_pid++;
1431 } while (pids.find(temp_pid) != pids.end());
1432 if (temp_pid >= System::maxPID)
1433 fatal("temp_pid is too large: %d", temp_pid);
1434
1435 pp->pid = temp_pid;
1436 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid();
1437 Process *cp = pp->create();
1438 delete pp;
1439
1440 Process *owner = ctc->getProcessPtr();
1441 ctc->setProcessPtr(cp);
1442 cp->assignThreadContext(ctc->contextId());
1443 owner->revokeThreadContext(ctc->contextId());
1444
1445 if (flags & OS::TGT_CLONE_PARENT_SETTID) {
1446 BufferArg ptidBuf(ptidPtr, sizeof(long));
1447 long *ptid = (long *)ptidBuf.bufferPtr();
1448 *ptid = cp->pid();
1449 ptidBuf.copyOut(tc->getMemProxy());
1450 }
1451
1452 cp->initState();
1453 p->clone(tc, ctc, cp, flags);
1454
1455 if (flags & OS::TGT_CLONE_THREAD) {
1456 delete cp->sigchld;
1457 cp->sigchld = p->sigchld;
1458 } else if (flags & OS::TGT_SIGCHLD) {
1459 *cp->sigchld = true;
1460 }
1461
1462 if (flags & OS::TGT_CLONE_CHILD_SETTID) {
1463 BufferArg ctidBuf(ctidPtr, sizeof(long));
1464 long *ctid = (long *)ctidBuf.bufferPtr();
1465 *ctid = cp->pid();
1466 ctidBuf.copyOut(ctc->getMemProxy());
1467 }
1468
1469 if (flags & OS::TGT_CLONE_CHILD_CLEARTID)
1470 cp->childClearTID = (uint64_t)ctidPtr;
1471
1472 ctc->clearArchRegs();
1473
1474 OS::archClone(flags, p, cp, tc, ctc, newStack, tlsPtr);
1475
1476 cp->setSyscallReturn(ctc, 0);
1477
1478#if THE_ISA == ALPHA_ISA
1479 ctc->setIntReg(TheISA::SyscallSuccessReg, 0);
1480#elif THE_ISA == SPARC_ISA
1481 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0);
1482 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1);
1483#endif
1484
1485 TheISA::PCState cpc = tc->pcState();
1486 cpc.advance();
1487 ctc->pcState(cpc);
1488 ctc->activate();
1489
1490 return cp->pid();
1491}
1492
1493/// Target fstatfs() handler.
1494template <class OS>
1495SyscallReturn
1496fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1497{
1498 int index = 0;
1499 int tgt_fd = p->getSyscallArg(tc, index);
1500 Addr bufPtr = p->getSyscallArg(tc, index);
1501
1502 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1503 if (!ffdp)
1504 return -EBADF;
1505 int sim_fd = ffdp->getSimFD();
1506
1507 struct statfs hostBuf;
1508 int result = fstatfs(sim_fd, &hostBuf);
1509
1510 if (result < 0)
1511 return -errno;
1512
1513 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1514
1515 return 0;
1516}
1517
1518
1519/// Target writev() handler.
1520template <class OS>
1521SyscallReturn
1522writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1523{
1524 int index = 0;
1525 int tgt_fd = p->getSyscallArg(tc, index);
1526
1527 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
1528 if (!hbfdp)
1529 return -EBADF;
1530 int sim_fd = hbfdp->getSimFD();
1531
1532 SETranslatingPortProxy &prox = tc->getMemProxy();
1533 uint64_t tiov_base = p->getSyscallArg(tc, index);
1534 size_t count = p->getSyscallArg(tc, index);
1535 struct iovec hiov[count];
1536 for (size_t i = 0; i < count; ++i) {
1537 typename OS::tgt_iovec tiov;
1538
1539 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1540 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1541 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1542 hiov[i].iov_base = new char [hiov[i].iov_len];
1543 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1544 hiov[i].iov_len);
1545 }
1546
1547 int result = writev(sim_fd, hiov, count);
1548
1549 for (size_t i = 0; i < count; ++i)
1550 delete [] (char *)hiov[i].iov_base;
1551
1552 if (result < 0)
1553 return -errno;
1554
1555 return result;
1556}
1557
1558/// Real mmap handler.
1559template <class OS>
1560SyscallReturn
1561mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc,
1562 bool is_mmap2)
1563{
1564 int index = 0;
1565 Addr start = p->getSyscallArg(tc, index);
1566 uint64_t length = p->getSyscallArg(tc, index);
1567 int prot = p->getSyscallArg(tc, index);
1568 int tgt_flags = p->getSyscallArg(tc, index);
1569 int tgt_fd = p->getSyscallArg(tc, index);
1570 int offset = p->getSyscallArg(tc, index);
1571
1572 if (is_mmap2)
1573 offset *= TheISA::PageBytes;
1574
1575 if (start & (TheISA::PageBytes - 1) ||
1576 offset & (TheISA::PageBytes - 1) ||
1577 (tgt_flags & OS::TGT_MAP_PRIVATE &&
1578 tgt_flags & OS::TGT_MAP_SHARED) ||
1579 (!(tgt_flags & OS::TGT_MAP_PRIVATE) &&
1580 !(tgt_flags & OS::TGT_MAP_SHARED)) ||
1581 !length) {
1582 return -EINVAL;
1583 }
1584
1585 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) {
1586 // With shared mmaps, there are two cases to consider:
1587 // 1) anonymous: writes should modify the mapping and this should be
1588 // visible to observers who share the mapping. Currently, it's
1589 // difficult to update the shared mapping because there's no
1590 // structure which maintains information about the which virtual
1591 // memory areas are shared. If that structure existed, it would be
1592 // possible to make the translations point to the same frames.
1593 // 2) file-backed: writes should modify the mapping and the file
1594 // which is backed by the mapping. The shared mapping problem is the
1595 // same as what was mentioned about the anonymous mappings. For
1596 // file-backed mappings, the writes to the file are difficult
1597 // because it requires syncing what the mapping holds with the file
1598 // that resides on the host system. So, any write on a real system
1599 // would cause the change to be propagated to the file mapping at
1600 // some point in the future (the inode is tracked along with the
1601 // mapping). This isn't guaranteed to always happen, but it usually
1602 // works well enough. The guarantee is provided by the msync system
1603 // call. We could force the change through with shared mappings with
1604 // a call to msync, but that again would require more information
1605 // than we currently maintain.
1606 warn("mmap: writing to shared mmap region is currently "
1607 "unsupported. The write succeeds on the target, but it "
1608 "will not be propagated to the host or shared mappings");
1609 }
1610
1611 length = roundUp(length, TheISA::PageBytes);
1612
1613 int sim_fd = -1;
1614 uint8_t *pmap = nullptr;
1615 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) {
1616 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd];
1617
1618 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep);
1619 if (dfdp) {
1620 EmulatedDriver *emul_driver = dfdp->getDriver();
1621 return emul_driver->mmap(p, tc, start, length, prot,
1622 tgt_flags, tgt_fd, offset);
1623 }
1624
1625 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep);
1626 if (!ffdp)
1627 return -EBADF;
1628 sim_fd = ffdp->getSimFD();
1629
1630 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE,
1631 sim_fd, offset);
1632
1633 if (pmap == (decltype(pmap))-1) {
1634 warn("mmap: failed to map file into host address space");
1635 return -errno;
1636 }
1637 }
1638
1639 // Extend global mmap region if necessary. Note that we ignore the
1640 // start address unless MAP_FIXED is specified.
1641 if (!(tgt_flags & OS::TGT_MAP_FIXED)) {
1642 std::shared_ptr<MemState> mem_state = p->memState;
1643 Addr mmap_end = mem_state->getMmapEnd();
1644
1645 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end;
1646 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length;
1647
1648 mem_state->setMmapEnd(mmap_end);
1649 }
1650
1651 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n",
1652 start, start + length - 1);
1653
1654 // We only allow mappings to overwrite existing mappings if
1655 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem
1656 // because we ignore the start hint if TGT_MAP_FIXED is not set.
1657 int clobber = tgt_flags & OS::TGT_MAP_FIXED;
1658 if (clobber) {
1659 for (auto tc : p->system->threadContexts) {
1660 // If we might be overwriting old mappings, we need to
1661 // invalidate potentially stale mappings out of the TLBs.
1662 tc->getDTBPtr()->flushAll();
1663 tc->getITBPtr()->flushAll();
1664 }
1665 }
1666
1667 // Allocate physical memory and map it in. If the page table is already
1668 // mapped and clobber is not set, the simulator will issue throw a
1669 // fatal and bail out of the simulation.
1670 p->allocateMem(start, length, clobber);
1671
1672 // Transfer content into target address space.
1673 SETranslatingPortProxy &tp = tc->getMemProxy();
1674 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) {
1675 // In general, we should zero the mapped area for anonymous mappings,
1676 // with something like:
1677 // tp.memsetBlob(start, 0, length);
1678 // However, given that we don't support sparse mappings, and
1679 // some applications can map a couple of gigabytes of space
1680 // (intending sparse usage), that can get painfully expensive.
1681 // Fortunately, since we don't properly implement munmap either,
1682 // there's no danger of remapping used memory, so for now all
1683 // newly mapped memory should already be zeroed so we can skip it.
1684 } else {
1685 // It is possible to mmap an area larger than a file, however
1686 // accessing unmapped portions the system triggers a "Bus error"
1687 // on the host. We must know when to stop copying the file from
1688 // the host into the target address space.
1689 struct stat file_stat;
1690 if (fstat(sim_fd, &file_stat) > 0)
1691 fatal("mmap: cannot stat file");
1692
1693 // Copy the portion of the file that is resident. This requires
1694 // checking both the mmap size and the filesize that we are
1695 // trying to mmap into this space; the mmap size also depends
1696 // on the specified offset into the file.
1697 uint64_t size = std::min((uint64_t)file_stat.st_size - offset,
1698 length);
1699 tp.writeBlob(start, pmap, size);
1700
1701 // Cleanup the mmap region before exiting this function.
1702 munmap(pmap, length);
1703
1704 // Maintain the symbol table for dynamic executables.
1705 // The loader will call mmap to map the images into its address
1706 // space and we intercept that here. We can verify that we are
1707 // executing inside the loader by checking the program counter value.
1708 // XXX: with multiprogrammed workloads or multi-node configurations,
1709 // this will not work since there is a single global symbol table.
1710 ObjectFile *interpreter = p->getInterpreter();
1711 if (interpreter) {
1712 Addr text_start = interpreter->textBase();
1713 Addr text_end = text_start + interpreter->textSize();
1714
1715 Addr pc = tc->pcState().pc();
1716
1717 if (pc >= text_start && pc < text_end) {
1718 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd];
1719 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep);
1720 ObjectFile *lib = createObjectFile(ffdp->getFileName());
1721
1722 if (lib) {
1723 lib->loadAllSymbols(debugSymbolTable,
1724 lib->textBase(), start);
1725 }
1726 }
1727 }
1728
1729 // Note that we do not zero out the remainder of the mapping. This
1730 // is done by a real system, but it probably will not affect
1731 // execution (hopefully).
1732 }
1733
1734 return start;
1735}
1736
1737template <class OS>
1738SyscallReturn
1739pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1740{
1741 int index = 0;
1742 int tgt_fd = p->getSyscallArg(tc, index);
1743 Addr bufPtr = p->getSyscallArg(tc, index);
1744 int nbytes = p->getSyscallArg(tc, index);
1745 int offset = p->getSyscallArg(tc, index);
1746
1747 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
1748 if (!ffdp)
1749 return -EBADF;
1750 int sim_fd = ffdp->getSimFD();
1751
1752 BufferArg bufArg(bufPtr, nbytes);
1753 bufArg.copyIn(tc->getMemProxy());
1754
1755 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset);
1756
1757 return (bytes_written == -1) ? -errno : bytes_written;
1758}
1759
1760/// Target mmap() handler.
1761template <class OS>
1762SyscallReturn
1763mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1764{
1765 return mmapImpl<OS>(desc, num, p, tc, false);
1766}
1767
1768/// Target mmap2() handler.
1769template <class OS>
1770SyscallReturn
1771mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1772{
1773 return mmapImpl<OS>(desc, num, p, tc, true);
1774}
1775
1776/// Target getrlimit() handler.
1777template <class OS>
1778SyscallReturn
1779getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
1780 ThreadContext *tc)
1781{
1782 int index = 0;
1783 unsigned resource = process->getSyscallArg(tc, index);
1784 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1785
1786 switch (resource) {
1787 case OS::TGT_RLIMIT_STACK:
1788 // max stack size in bytes: make up a number (8MB for now)
1789 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1790 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1791 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1792 break;
1793
1794 case OS::TGT_RLIMIT_DATA:
1795 // max data segment size in bytes: make up a number
1796 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1797 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1798 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1799 break;
1800
1801 default:
1802 warn("getrlimit: unimplemented resource %d", resource);
1803 return -EINVAL;
1804 break;
1805 }
1806
1807 rlp.copyOut(tc->getMemProxy());
1808 return 0;
1809}
1810
1811template <class OS>
1812SyscallReturn
1813prlimitFunc(SyscallDesc *desc, int callnum, Process *process,
1814 ThreadContext *tc)
1815{
1816 int index = 0;
1817 if (process->getSyscallArg(tc, index) != 0)
1818 {
1819 warn("prlimit: ignoring rlimits for nonzero pid");
1820 return -EPERM;
1821 }
1822 int resource = process->getSyscallArg(tc, index);
1823 Addr n = process->getSyscallArg(tc, index);
1824 if (n != 0)
1825 warn("prlimit: ignoring new rlimit");
1826 Addr o = process->getSyscallArg(tc, index);
1827 if (o != 0)
1828 {
1829 TypedBufferArg<typename OS::rlimit> rlp(o);
1830 switch (resource) {
1831 case OS::TGT_RLIMIT_STACK:
1832 // max stack size in bytes: make up a number (8MB for now)
1833 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1834 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1835 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1836 break;
1837 case OS::TGT_RLIMIT_DATA:
1838 // max data segment size in bytes: make up a number
1839 rlp->rlim_cur = rlp->rlim_max = 256*1024*1024;
1840 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1841 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1842 break;
1843 default:
1844 warn("prlimit: unimplemented resource %d", resource);
1845 return -EINVAL;
1846 break;
1847 }
1848 rlp.copyOut(tc->getMemProxy());
1849 }
1850 return 0;
1851}
1852
1853/// Target clock_gettime() function.
1854template <class OS>
1855SyscallReturn
1856clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1857{
1858 int index = 1;
1859 //int clk_id = p->getSyscallArg(tc, index);
1860 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1861
1862 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1863 tp->tv_sec += seconds_since_epoch;
1864 tp->tv_sec = TheISA::htog(tp->tv_sec);
1865 tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1866
1867 tp.copyOut(tc->getMemProxy());
1868
1869 return 0;
1870}
1871
1872/// Target clock_getres() function.
1873template <class OS>
1874SyscallReturn
1875clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
1876{
1877 int index = 1;
1878 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1879
1880 // Set resolution at ns, which is what clock_gettime() returns
1881 tp->tv_sec = 0;
1882 tp->tv_nsec = 1;
1883
1884 tp.copyOut(tc->getMemProxy());
1885
1886 return 0;
1887}
1888
1889/// Target gettimeofday() handler.
1890template <class OS>
1891SyscallReturn
1892gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
1893 ThreadContext *tc)
1894{
1895 int index = 0;
1896 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1897
1898 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1899 tp->tv_sec += seconds_since_epoch;
1900 tp->tv_sec = TheISA::htog(tp->tv_sec);
1901 tp->tv_usec = TheISA::htog(tp->tv_usec);
1902
1903 tp.copyOut(tc->getMemProxy());
1904
1905 return 0;
1906}
1907
1908
1909/// Target utimes() handler.
1910template <class OS>
1911SyscallReturn
1912utimesFunc(SyscallDesc *desc, int callnum, Process *process,
1913 ThreadContext *tc)
1914{
1915 std::string path;
1916
1917 int index = 0;
1918 if (!tc->getMemProxy().tryReadString(path,
1919 process->getSyscallArg(tc, index))) {
1920 return -EFAULT;
1921 }
1922
1923 TypedBufferArg<typename OS::timeval [2]>
1924 tp(process->getSyscallArg(tc, index));
1925 tp.copyIn(tc->getMemProxy());
1926
1927 struct timeval hostTimeval[2];
1928 for (int i = 0; i < 2; ++i) {
1929 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1930 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1931 }
1932
1933 // Adjust path for current working directory
1934 path = process->fullPath(path);
1935
1936 int result = utimes(path.c_str(), hostTimeval);
1937
1938 if (result < 0)
1939 return -errno;
1940
1941 return 0;
1942}
1943
1944template <class OS>
1945SyscallReturn
1946execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
1947{
1948 desc->setFlags(0);
1949
1950 int index = 0;
1951 std::string path;
1952 SETranslatingPortProxy & mem_proxy = tc->getMemProxy();
1953 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index)))
1954 return -EFAULT;
1955
1956 if (access(path.c_str(), F_OK) == -1)
1957 return -EACCES;
1958
1959 auto read_in = [](std::vector<std::string> & vect,
1960 SETranslatingPortProxy & mem_proxy,
1961 Addr mem_loc)
1962 {
1963 for (int inc = 0; ; inc++) {
1964 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr));
1965 b.copyIn(mem_proxy);
1966
1967 if (!*(Addr*)b.bufferPtr())
1968 break;
1969
1970 vect.push_back(std::string());
1971 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr());
1972 }
1973 };
1974
1975 /**
1976 * Note that ProcessParams is generated by swig and there are no other
1977 * examples of how to create anything but this default constructor. The
1978 * fields are manually initialized instead of passing parameters to the
1979 * constructor.
1980 */
1981 ProcessParams *pp = new ProcessParams();
1982 pp->executable = path;
1983 Addr argv_mem_loc = p->getSyscallArg(tc, index);
1984 read_in(pp->cmd, mem_proxy, argv_mem_loc);
1985 Addr envp_mem_loc = p->getSyscallArg(tc, index);
1986 read_in(pp->env, mem_proxy, envp_mem_loc);
1987 pp->uid = p->uid();
1988 pp->egid = p->egid();
1989 pp->euid = p->euid();
1990 pp->gid = p->gid();
1991 pp->ppid = p->ppid();
1992 pp->pid = p->pid();
1993 pp->input.assign("cin");
1994 pp->output.assign("cout");
1995 pp->errout.assign("cerr");
1996 pp->cwd.assign(p->getcwd());
1997 pp->system = p->system;
1998 /**
1999 * Prevent process object creation with identical PIDs (which will trip
2000 * a fatal check in Process constructor). The execve call is supposed to
2001 * take over the currently executing process' identity but replace
2002 * whatever it is doing with a new process image. Instead of hijacking
2003 * the process object in the simulator, we create a new process object
2004 * and bind to the previous process' thread below (hijacking the thread).
2005 */
2006 p->system->PIDs.erase(p->pid());
2007 Process *new_p = pp->create();
2008 delete pp;
2009
2010 /**
2011 * Work through the file descriptor array and close any files marked
2012 * close-on-exec.
2013 */
2014 new_p->fds = p->fds;
2015 for (int i = 0; i < new_p->fds->getSize(); i++) {
2016 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i];
2017 if (fdep && fdep->getCOE())
2018 new_p->fds->closeFDEntry(i);
2019 }
2020
2021 *new_p->sigchld = true;
2022
2023 delete p;
2024 tc->clearArchRegs();
2025 tc->setProcessPtr(new_p);
2026 new_p->assignThreadContext(tc->contextId());
2027 new_p->initState();
2028 tc->activate();
2029 TheISA::PCState pcState = tc->pcState();
2030 tc->setNPC(pcState.instAddr());
2031
2032 desc->setFlags(SyscallDesc::SuppressReturnValue);
2033 return 0;
2034}
2035
2036/// Target getrusage() function.
2037template <class OS>
2038SyscallReturn
2039getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
2040 ThreadContext *tc)
2041{
2042 int index = 0;
2043 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
2044 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
2045
2046 rup->ru_utime.tv_sec = 0;
2047 rup->ru_utime.tv_usec = 0;
2048 rup->ru_stime.tv_sec = 0;
2049 rup->ru_stime.tv_usec = 0;
2050 rup->ru_maxrss = 0;
2051 rup->ru_ixrss = 0;
2052 rup->ru_idrss = 0;
2053 rup->ru_isrss = 0;
2054 rup->ru_minflt = 0;
2055 rup->ru_majflt = 0;
2056 rup->ru_nswap = 0;
2057 rup->ru_inblock = 0;
2058 rup->ru_oublock = 0;
2059 rup->ru_msgsnd = 0;
2060 rup->ru_msgrcv = 0;
2061 rup->ru_nsignals = 0;
2062 rup->ru_nvcsw = 0;
2063 rup->ru_nivcsw = 0;
2064
2065 switch (who) {
2066 case OS::TGT_RUSAGE_SELF:
2067 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
2068 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
2069 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
2070 break;
2071
2072 case OS::TGT_RUSAGE_CHILDREN:
2073 // do nothing. We have no child processes, so they take no time.
2074 break;
2075
2076 default:
2077 // don't really handle THREAD or CHILDREN, but just warn and
2078 // plow ahead
2079 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
2080 who);
2081 }
2082
2083 rup.copyOut(tc->getMemProxy());
2084
2085 return 0;
2086}
2087
2088/// Target times() function.
2089template <class OS>
2090SyscallReturn
2091timesFunc(SyscallDesc *desc, int callnum, Process *process,
2092 ThreadContext *tc)
2093{
2094 int index = 0;
2095 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
2096
2097 // Fill in the time structure (in clocks)
2098 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
2099 bufp->tms_utime = clocks;
2100 bufp->tms_stime = 0;
2101 bufp->tms_cutime = 0;
2102 bufp->tms_cstime = 0;
2103
2104 // Convert to host endianness
2105 bufp->tms_utime = TheISA::htog(bufp->tms_utime);
2106
2107 // Write back
2108 bufp.copyOut(tc->getMemProxy());
2109
2110 // Return clock ticks since system boot
2111 return clocks;
2112}
2113
2114/// Target time() function.
2115template <class OS>
2116SyscallReturn
2117timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
2118{
2119 typename OS::time_t sec, usec;
2120 getElapsedTimeMicro(sec, usec);
2121 sec += seconds_since_epoch;
2122
2123 int index = 0;
2124 Addr taddr = (Addr)process->getSyscallArg(tc, index);
2125 if (taddr != 0) {
2126 typename OS::time_t t = sec;
2127 t = TheISA::htog(t);
2128 SETranslatingPortProxy &p = tc->getMemProxy();
2129 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
2130 }
2131 return sec;
2132}
2133
2134template <class OS>
2135SyscallReturn
2136tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc)
2137{
2138 int index = 0;
2139 int tgid = process->getSyscallArg(tc, index);
2140 int tid = process->getSyscallArg(tc, index);
2141 int sig = process->getSyscallArg(tc, index);
2142
2143 /**
2144 * This system call is intended to allow killing a specific thread
2145 * within an arbitrary thread group if sanctioned with permission checks.
2146 * It's usually true that threads share the termination signal as pointed
2147 * out by the pthread_kill man page and this seems to be the intended
2148 * usage. Due to this being an emulated environment, assume the following:
2149 * Threads are allowed to call tgkill because the EUID for all threads
2150 * should be the same. There is no signal handling mechanism for kernel
2151 * registration of signal handlers since signals are poorly supported in
2152 * emulation mode. Since signal handlers cannot be registered, all
2153 * threads within in a thread group must share the termination signal.
2154 * We never exhaust PIDs so there's no chance of finding the wrong one
2155 * due to PID rollover.
2156 */
2157
2158 System *sys = tc->getSystemPtr();
2159 Process *tgt_proc = nullptr;
2160 for (int i = 0; i < sys->numContexts(); i++) {
2161 Process *temp = sys->threadContexts[i]->getProcessPtr();
2162 if (temp->pid() == tid) {
2163 tgt_proc = temp;
2164 break;
2165 }
2166 }
2167
2168 if (sig != 0 || sig != OS::TGT_SIGABRT)
2169 return -EINVAL;
2170
2171 if (tgt_proc == nullptr)
2172 return -ESRCH;
2173
2174 if (tgid != -1 && tgt_proc->tgid() != tgid)
2175 return -ESRCH;
2176
2177 if (sig == OS::TGT_SIGABRT)
2178 exitGroupFunc(desc, 252, process, tc);
2179
2180 return 0;
2181}
2182
2183template <class OS>
2184SyscallReturn
2185socketFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
2186{
2187 int index = 0;
2188 int domain = p->getSyscallArg(tc, index);
2189 int type = p->getSyscallArg(tc, index);
2190 int prot = p->getSyscallArg(tc, index);
2191
2192 int sim_fd = socket(domain, type, prot);
2193 if (sim_fd == -1)
2194 return -errno;
2195
2196 auto sfdp = std::make_shared<SocketFDEntry>(sim_fd, domain, type, prot);
2197 int tgt_fd = p->fds->allocFD(sfdp);
2198
2199 return tgt_fd;
2200}
2201
2202template <class OS>
2203SyscallReturn
2204socketpairFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
2205{
2206 int index = 0;
2207 int domain = p->getSyscallArg(tc, index);
2208 int type = p->getSyscallArg(tc, index);
2209 int prot = p->getSyscallArg(tc, index);
2210 Addr svPtr = p->getSyscallArg(tc, index);
2211
2212 BufferArg svBuf((Addr)svPtr, 2 * sizeof(int));
2213 int status = socketpair(domain, type, prot, (int *)svBuf.bufferPtr());
2214 if (status == -1)
2215 return -errno;
2216
2217 int *fds = (int *)svBuf.bufferPtr();
2218
2219 auto sfdp1 = std::make_shared<SocketFDEntry>(fds[0], domain, type, prot);
2220 fds[0] = p->fds->allocFD(sfdp1);
2221 auto sfdp2 = std::make_shared<SocketFDEntry>(fds[1], domain, type, prot);
2222 fds[1] = p->fds->allocFD(sfdp2);
2223 svBuf.copyOut(tc->getMemProxy());
2224
2225 return status;
2226}
2227
2228template <class OS>
2229SyscallReturn
2230selectFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
2231{
2232 int retval;
2233
2234 int index = 0;
2235 int nfds_t = p->getSyscallArg(tc, index);
2236 Addr fds_read_ptr = p->getSyscallArg(tc, index);
2237 Addr fds_writ_ptr = p->getSyscallArg(tc, index);
2238 Addr fds_excp_ptr = p->getSyscallArg(tc, index);
2239 Addr time_val_ptr = p->getSyscallArg(tc, index);
2240
2241 TypedBufferArg<typename OS::fd_set> rd_t(fds_read_ptr);
2242 TypedBufferArg<typename OS::fd_set> wr_t(fds_writ_ptr);
2243 TypedBufferArg<typename OS::fd_set> ex_t(fds_excp_ptr);
2244 TypedBufferArg<typename OS::timeval> tp(time_val_ptr);
2245
2246 /**
2247 * Host fields. Notice that these use the definitions from the system
2248 * headers instead of the gem5 headers and libraries. If the host and
2249 * target have different header file definitions, this will not work.
2250 */
2251 fd_set rd_h;
2252 FD_ZERO(&rd_h);
2253 fd_set wr_h;
2254 FD_ZERO(&wr_h);
2255 fd_set ex_h;
2256 FD_ZERO(&ex_h);
2257
2258 /**
2259 * Copy in the fd_set from the target.
2260 */
2261 if (fds_read_ptr)
2262 rd_t.copyIn(tc->getMemProxy());
2263 if (fds_writ_ptr)
2264 wr_t.copyIn(tc->getMemProxy());
2265 if (fds_excp_ptr)
2266 ex_t.copyIn(tc->getMemProxy());
2267
2268 /**
2269 * We need to translate the target file descriptor set into a host file
2270 * descriptor set. This involves both our internal process fd array
2271 * and the fd_set defined in Linux header files. The nfds field also
2272 * needs to be updated as it will be only target specific after
2273 * retrieving it from the target; the nfds value is expected to be the
2274 * highest file descriptor that needs to be checked, so we need to extend
2275 * it out for nfds_h when we do the update.
2276 */
2277 int nfds_h = 0;
2278 std::map<int, int> trans_map;
2279 auto try_add_host_set = [&](fd_set *tgt_set_entry,
2280 fd_set *hst_set_entry,
2281 int iter) -> bool
2282 {
2283 /**
2284 * By this point, we know that we are looking at a valid file
2285 * descriptor set on the target. We need to check if the target file
2286 * descriptor value passed in as iter is part of the set.
2287 */
2288 if (FD_ISSET(iter, tgt_set_entry)) {
2289 /**
2290 * We know that the target file descriptor belongs to the set,
2291 * but we do not yet know if the file descriptor is valid or
2292 * that we have a host mapping. Check that now.
2293 */
2294 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[iter]);
2295 if (!hbfdp)
2296 return true;
2297 auto sim_fd = hbfdp->getSimFD();
2298
2299 /**
2300 * Add the sim_fd to tgt_fd translation into trans_map for use
2301 * later when we need to zero the target fd_set structures and
2302 * then update them with hits returned from the host select call.
2303 */
2304 trans_map[sim_fd] = iter;
2305
2306 /**
2307 * We know that the host file descriptor exists so now we check
2308 * if we need to update the max count for nfds_h before passing
2309 * the duplicated structure into the host.
2310 */
2311 nfds_h = std::max(nfds_h - 1, sim_fd + 1);
2312
2313 /**
2314 * Add the host file descriptor to the set that we are going to
2315 * pass into the host.
2316 */
2317 FD_SET(sim_fd, hst_set_entry);
2318 }
2319 return false;
2320 };
2321
2322 for (int i = 0; i < nfds_t; i++) {
2323 if (fds_read_ptr) {
2324 bool ebadf = try_add_host_set((fd_set*)&*rd_t, &rd_h, i);
2325 if (ebadf) return -EBADF;
2326 }
2327 if (fds_writ_ptr) {
2328 bool ebadf = try_add_host_set((fd_set*)&*wr_t, &wr_h, i);
2329 if (ebadf) return -EBADF;
2330 }
2331 if (fds_excp_ptr) {
2332 bool ebadf = try_add_host_set((fd_set*)&*ex_t, &ex_h, i);
2333 if (ebadf) return -EBADF;
2334 }
2335 }
2336
2337 if (time_val_ptr) {
2338 /**
2339 * It might be possible to decrement the timeval based on some
2340 * derivation of wall clock determined from elapsed simulator ticks
2341 * but that seems like overkill. Rather, we just set the timeval with
2342 * zero timeout. (There is no reason to block during the simulation
2343 * as it only decreases simulator performance.)
2344 */
2345 tp->tv_sec = 0;
2346 tp->tv_usec = 0;
2347
2348 retval = select(nfds_h,
2349 fds_read_ptr ? &rd_h : nullptr,
2350 fds_writ_ptr ? &wr_h : nullptr,
2351 fds_excp_ptr ? &ex_h : nullptr,
2352 (timeval*)&*tp);
2353 } else {
2354 /**
2355 * If the timeval pointer is null, setup a new timeval structure to
2356 * pass into the host select call. Unfortunately, we will need to
2357 * manually check the return value and throw a retry fault if the
2358 * return value is zero. Allowing the system call to block will
2359 * likely deadlock the event queue.
2360 */
2361 struct timeval tv = { 0, 0 };
2362
2363 retval = select(nfds_h,
2364 fds_read_ptr ? &rd_h : nullptr,
2365 fds_writ_ptr ? &wr_h : nullptr,
2366 fds_excp_ptr ? &ex_h : nullptr,
2367 &tv);
2368
2369 if (retval == 0) {
2370 /**
2371 * If blocking indefinitely, check the signal list to see if a
2372 * signal would break the poll out of the retry cycle and try to
2373 * return the signal interrupt instead.
2374 */
2375 for (auto sig : tc->getSystemPtr()->signalList)
2376 if (sig.receiver == p)
2377 return -EINTR;
2378 return SyscallReturn::retry();
2379 }
2380 }
2381
2382 if (retval == -1)
2383 return -errno;
2384
2385 FD_ZERO((fd_set*)&*rd_t);
2386 FD_ZERO((fd_set*)&*wr_t);
2387 FD_ZERO((fd_set*)&*ex_t);
2388
2389 /**
2390 * We need to translate the host file descriptor set into a target file
2391 * descriptor set. This involves both our internal process fd array
2392 * and the fd_set defined in header files.
2393 */
2394 for (int i = 0; i < nfds_h; i++) {
2395 if (fds_read_ptr) {
2396 if (FD_ISSET(i, &rd_h))
2397 FD_SET(trans_map[i], (fd_set*)&*rd_t);
2398 }
2399
2400 if (fds_writ_ptr) {
2401 if (FD_ISSET(i, &wr_h))
2402 FD_SET(trans_map[i], (fd_set*)&*wr_t);
2403 }
2404
2405 if (fds_excp_ptr) {
2406 if (FD_ISSET(i, &ex_h))
2407 FD_SET(trans_map[i], (fd_set*)&*ex_t);
2408 }
2409 }
2410
2411 if (fds_read_ptr)
2412 rd_t.copyOut(tc->getMemProxy());
2413 if (fds_writ_ptr)
2414 wr_t.copyOut(tc->getMemProxy());
2415 if (fds_excp_ptr)
2416 ex_t.copyOut(tc->getMemProxy());
2417 if (time_val_ptr)
2418 tp.copyOut(tc->getMemProxy());
2419
2420 return retval;
2421}
2422
2423template <class OS>
2424SyscallReturn
2425readFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
2426{
2427 int index = 0;
2428 int tgt_fd = p->getSyscallArg(tc, index);
2429 Addr buf_ptr = p->getSyscallArg(tc, index);
2430 int nbytes = p->getSyscallArg(tc, index);
2431
2432 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
2433 if (!hbfdp)
2434 return -EBADF;
2435 int sim_fd = hbfdp->getSimFD();
2436
2437 struct pollfd pfd;
2438 pfd.fd = sim_fd;
2439 pfd.events = POLLIN | POLLPRI;
2440 if ((poll(&pfd, 1, 0) == 0)
2441 && !(hbfdp->getFlags() & OS::TGT_O_NONBLOCK))
2442 return SyscallReturn::retry();
2443
2444 BufferArg buf_arg(buf_ptr, nbytes);
2445 int bytes_read = read(sim_fd, buf_arg.bufferPtr(), nbytes);
2446
2447 if (bytes_read > 0)
2448 buf_arg.copyOut(tc->getMemProxy());
2449
2450 return (bytes_read == -1) ? -errno : bytes_read;
2451}
2452
2453template <class OS>
2454SyscallReturn
2455writeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
2456{
2457 int index = 0;
2458 int tgt_fd = p->getSyscallArg(tc, index);
2459 Addr buf_ptr = p->getSyscallArg(tc, index);
2460 int nbytes = p->getSyscallArg(tc, index);
2461
2462 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]);
2463 if (!hbfdp)
2464 return -EBADF;
2465 int sim_fd = hbfdp->getSimFD();
2466
2467 BufferArg buf_arg(buf_ptr, nbytes);
2468 buf_arg.copyIn(tc->getMemProxy());
2469
2470 struct pollfd pfd;
2471 pfd.fd = sim_fd;
2472 pfd.events = POLLOUT;
2473
2474 /**
2475 * We don't want to poll on /dev/random. The kernel will not enable the
2476 * file descriptor for writing unless the entropy in the system falls
2477 * below write_wakeup_threshold. This is not guaranteed to happen
2478 * depending on host settings.
2479 */
2480 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(hbfdp);
2481 if (ffdp && (ffdp->getFileName() != "/dev/random")) {
2482 if (!poll(&pfd, 1, 0) && !(ffdp->getFlags() & OS::TGT_O_NONBLOCK))
2483 return SyscallReturn::retry();
2484 }
2485
2486 int bytes_written = write(sim_fd, buf_arg.bufferPtr(), nbytes);
2487
2488 if (bytes_written != -1)
2489 fsync(sim_fd);
2490
2491 return (bytes_written == -1) ? -errno : bytes_written;
2492}
2493
2494template <class OS>
2495SyscallReturn
2496wait4Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
2497{
2498 int index = 0;
2499 pid_t pid = p->getSyscallArg(tc, index);
2500 Addr statPtr = p->getSyscallArg(tc, index);
2501 int options = p->getSyscallArg(tc, index);
2502 Addr rusagePtr = p->getSyscallArg(tc, index);
2503
2504 if (rusagePtr)
2505 DPRINTFR(SyscallVerbose,
2506 "%d: %s: syscall wait4: rusage pointer provided however "
2507 "functionality not supported. Ignoring rusage pointer.\n",
2508 curTick(), tc->getCpuPtr()->name());
2509
2510 /**
2511 * Currently, wait4 is only implemented so that it will wait for children
2512 * exit conditions which are denoted by a SIGCHLD signals posted into the
2513 * system signal list. We return no additional information via any of the
2514 * parameters supplied to wait4. If nothing is found in the system signal
2515 * list, we will wait indefinitely for SIGCHLD to post by retrying the
2516 * call.
2517 */
2518 System *sysh = tc->getSystemPtr();
2519 std::list<BasicSignal>::iterator iter;
2520 for (iter=sysh->signalList.begin(); iter!=sysh->signalList.end(); iter++) {
2521 if (iter->receiver == p) {
2522 if (pid < -1) {
2523 if ((iter->sender->pgid() == -pid)
2524 && (iter->signalValue == OS::TGT_SIGCHLD))
2525 goto success;
2526 } else if (pid == -1) {
2527 if (iter->signalValue == OS::TGT_SIGCHLD)
2528 goto success;
2529 } else if (pid == 0) {
2530 if ((iter->sender->pgid() == p->pgid())
2531 && (iter->signalValue == OS::TGT_SIGCHLD))
2532 goto success;
2533 } else {
2534 if ((iter->sender->pid() == pid)
2535 && (iter->signalValue == OS::TGT_SIGCHLD))
2536 goto success;
2537 }
2538 }
2539 }
2540
2541 return (options & OS::TGT_WNOHANG) ? 0 : SyscallReturn::retry();
2542
2543success:
2544 // Set status to EXITED for WIFEXITED evaluations.
2545 const int EXITED = 0;
2546 BufferArg statusBuf(statPtr, sizeof(int));
2547 *(int *)statusBuf.bufferPtr() = EXITED;
2548 statusBuf.copyOut(tc->getMemProxy());
2549
2550 // Return the child PID.
2551 pid_t retval = iter->sender->pid();
2552 sysh->signalList.erase(iter);
2553 return retval;
2554}
2555
2556template <class OS>
2557SyscallReturn
2558acceptFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
2559{
2560 struct sockaddr sa;
2561 socklen_t addrLen;
2562 int host_fd;
2563 int index = 0;
2564 int tgt_fd = p->getSyscallArg(tc, index);
2565 Addr addrPtr = p->getSyscallArg(tc, index);
2566 Addr lenPtr = p->getSyscallArg(tc, index);
2567
2568 BufferArg *lenBufPtr = nullptr;
2569 BufferArg *addrBufPtr = nullptr;
2570
2571 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]);
2572 if (!sfdp)
2573 return -EBADF;
2574 int sim_fd = sfdp->getSimFD();
2575
2576 /**
2577 * We poll the socket file descriptor first to guarantee that we do not
2578 * block on our accept call. The socket can be opened without the
2579 * non-blocking flag (it blocks). This will cause deadlocks between
2580 * communicating processes.
2581 */
2582 struct pollfd pfd;
2583 pfd.fd = sim_fd;
2584 pfd.events = POLLIN | POLLPRI;
2585 if ((poll(&pfd, 1, 0) == 0)
2586 && !(sfdp->getFlags() & OS::TGT_O_NONBLOCK))
2587 return SyscallReturn::retry();
2588
2589 if (lenPtr) {
2590 lenBufPtr = new BufferArg(lenPtr, sizeof(socklen_t));
2591 lenBufPtr->copyIn(tc->getMemProxy());
2592 memcpy(&addrLen, (socklen_t *)lenBufPtr->bufferPtr(),
2593 sizeof(socklen_t));
2594 }
2595
2596 if (addrPtr) {
2597 addrBufPtr = new BufferArg(addrPtr, sizeof(struct sockaddr));
2598 addrBufPtr->copyIn(tc->getMemProxy());
2599 memcpy(&sa, (struct sockaddr *)addrBufPtr->bufferPtr(),
2600 sizeof(struct sockaddr));
2601 }
2602
2603 host_fd = accept(sim_fd, &sa, &addrLen);
2604
2605 if (host_fd == -1)
2606 return -errno;
2607
2608 if (addrPtr) {
2609 memcpy(addrBufPtr->bufferPtr(), &sa, sizeof(sa));
2610 addrBufPtr->copyOut(tc->getMemProxy());
2611 delete(addrBufPtr);
2612 }
2613
2614 if (lenPtr) {
2615 *(socklen_t *)lenBufPtr->bufferPtr() = addrLen;
2616 lenBufPtr->copyOut(tc->getMemProxy());
2617 delete(lenBufPtr);
2618 }
2619
2620 auto afdp = std::make_shared<SocketFDEntry>(host_fd, sfdp->_domain,
2621 sfdp->_type, sfdp->_protocol);
2622 return p->fds->allocFD(afdp);
2623}
2624
2625#endif // __SIM_SYSCALL_EMUL_HH__