1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 * Ali Saidi
30 */
31
32#include <fcntl.h>
33#include <unistd.h>
34
35#include <cstdio>
36#include <iostream>
37#include <string>
38
39#include "arch/utility.hh"
40#include "base/chunk_generator.hh"
41#include "base/trace.hh"
42#include "config/the_isa.hh"
43#include "cpu/base.hh"
44#include "cpu/thread_context.hh"
45#include "debug/SyscallVerbose.hh"
46#include "mem/page_table.hh"
47#include "sim/process.hh"
48#include "sim/sim_exit.hh"
49#include "sim/syscall_emul.hh"
50#include "sim/system.hh"
51
52using namespace std;
53using namespace TheISA;
54
55void
56SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc)
57{
58 if (DTRACE(SyscallVerbose)) {
59 int index = 0;
60 IntReg arg[4] M5_VAR_USED;
61
62 // we can't just put the calls to getSyscallArg() in the
63 // DPRINTF arg list, because C++ doesn't guarantee their order
64 for (int i = 0; i < 4; ++i)
65 arg[i] = process->getSyscallArg(tc, index);
66
67 DPRINTFNR("%d: %s: syscall %s called w/arguments %d,%d,%d,%d\n",
68 curTick(), tc->getCpuPtr()->name(), name,
69 arg[0], arg[1], arg[2], arg[3]);
70 }
71
72 SyscallReturn retval = (*funcPtr)(this, callnum, process, tc);
73
74 if (retval.needsRetry()) {
75 DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s needs retry\n",
76 name);
77 } else {
78 DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s returns %d\n",
79 name, retval.encodedValue());
80 }
81
82 if (!(flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry())
83 process->setSyscallReturn(tc, retval);
84}
85
86
87SyscallReturn
88unimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
89 ThreadContext *tc)
90{
91 fatal("syscall %s (#%d) unimplemented.", desc->name, callnum);
92
93 return 1;
94}
95
96
97SyscallReturn
98ignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
99 ThreadContext *tc)
100{
101 int index = 0;
102 const char *extra_text = "";
103
104 if (desc->warnOnce()) {
105 if (desc->warned)
106 return 0;
107
108 desc->warned = true;
109 extra_text = "\n (further warnings will be suppressed)";
110 }
111
112 warn("ignoring syscall %s(%d, ...)%s", desc->name,
113 process->getSyscallArg(tc, index), extra_text);
114
115 return 0;
116}
117
118
119SyscallReturn
120exitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
121 ThreadContext *tc)
122{
123 if (process->system->numRunningContexts() == 1) {
124 // Last running context... exit simulator
125 int index = 0;
126 exitSimLoop("target called exit()",
127 process->getSyscallArg(tc, index) & 0xff);
128 } else {
129 // other running threads... just halt this one
130 tc->halt();
131 }
132
133 return 1;
134}
135
136
137SyscallReturn
138exitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
139 ThreadContext *tc)
140{
141 // halt all threads belonging to this process
142 for (auto i: process->contextIds) {
143 process->system->getThreadContext(i)->halt();
144 }
145
146 if (!process->system->numRunningContexts()) {
147 // all threads belonged to this process... exit simulator
148 int index = 0;
149 exitSimLoop("target called exit()",
150 process->getSyscallArg(tc, index) & 0xff);
151 }
152
153 return 1;
154}
155
156
157SyscallReturn
158getpagesizeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
159{
160 return (int)PageBytes;
161}
162
163
164SyscallReturn
165brkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
166{
167 // change brk addr to first arg
168 int index = 0;
169 Addr new_brk = p->getSyscallArg(tc, index);
170
171 // in Linux at least, brk(0) returns the current break value
172 // (note that the syscall and the glibc function have different behavior)
173 if (new_brk == 0)
174 return p->brk_point;
175
176 if (new_brk > p->brk_point) {
177 // might need to allocate some new pages
178 for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point,
179 PageBytes); !gen.done(); gen.next()) {
180 if (!p->pTable->translate(gen.addr()))
181 p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes);
182
183 // if the address is already there, zero it out
184 else {
185 uint8_t zero = 0;
186 SETranslatingPortProxy &tp = tc->getMemProxy();
187
188 // split non-page aligned accesses
189 Addr next_page = roundUp(gen.addr(), PageBytes);
190 uint32_t size_needed = next_page - gen.addr();
191 tp.memsetBlob(gen.addr(), zero, size_needed);
192 if (gen.addr() + PageBytes > next_page &&
193 next_page < new_brk &&
194 p->pTable->translate(next_page))
195 {
196 size_needed = PageBytes - size_needed;
197 tp.memsetBlob(next_page, zero, size_needed);
198 }
199 }
200 }
201 }
202
203 p->brk_point = new_brk;
204 DPRINTF(SyscallVerbose, "Break Point changed to: %#X\n", p->brk_point);
205 return p->brk_point;
206}
207
208
209SyscallReturn
210closeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
211{
212 int index = 0;
213 int tgt_fd = p->getSyscallArg(tc, index);
214
215 int sim_fd = p->getSimFD(tgt_fd);
216 if (sim_fd < 0)
217 return -EBADF;
218
219 int status = 0;
220 if (sim_fd > 2)
221 status = close(sim_fd);
222 if (status >= 0)
223 p->resetFDEntry(tgt_fd);
224 return status;
225}
226
227
228SyscallReturn
229readFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
230{
231 int index = 0;
232 int tgt_fd = p->getSyscallArg(tc, index);
233 Addr bufPtr = p->getSyscallArg(tc, index);
234 int nbytes = p->getSyscallArg(tc, index);
235 BufferArg bufArg(bufPtr, nbytes);
236
237 int sim_fd = p->getSimFD(tgt_fd);
238 if (sim_fd < 0)
239 return -EBADF;
240
241 int bytes_read = read(sim_fd, bufArg.bufferPtr(), nbytes);
242
243 if (bytes_read != -1)
244 bufArg.copyOut(tc->getMemProxy());
245
246 return bytes_read;
247}
248
249SyscallReturn
250writeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
251{
252 int index = 0;
253 int tgt_fd = p->getSyscallArg(tc, index);
254 Addr bufPtr = p->getSyscallArg(tc, index);
255 int nbytes = p->getSyscallArg(tc, index);
256 BufferArg bufArg(bufPtr, nbytes);
257
258 int sim_fd = p->getSimFD(tgt_fd);
259 if (sim_fd < 0)
260 return -EBADF;
261
262 bufArg.copyIn(tc->getMemProxy());
263
264 int bytes_written = write(sim_fd, bufArg.bufferPtr(), nbytes);
265
266 fsync(sim_fd);
267
268 return bytes_written;
269}
270
271
272SyscallReturn
273lseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
274{
275 int index = 0;
276 int tgt_fd = p->getSyscallArg(tc, index);
277 uint64_t offs = p->getSyscallArg(tc, index);
278 int whence = p->getSyscallArg(tc, index);
279
280 int sim_fd = p->getSimFD(tgt_fd);
281 if (sim_fd < 0)
282 return -EBADF;
283
284 off_t result = lseek(sim_fd, offs, whence);
285
286 return (result == (off_t)-1) ? -errno : result;
287}
288
289
290SyscallReturn
291_llseekFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
292{
293 int index = 0;
294 int tgt_fd = p->getSyscallArg(tc, index);
295 uint64_t offset_high = p->getSyscallArg(tc, index);
296 uint32_t offset_low = p->getSyscallArg(tc, index);
297 Addr result_ptr = p->getSyscallArg(tc, index);
298 int whence = p->getSyscallArg(tc, index);
299
300 int sim_fd = p->getSimFD(tgt_fd);
301 if (sim_fd < 0)
302 return -EBADF;
303
304 uint64_t offset = (offset_high << 32) | offset_low;
305
306 uint64_t result = lseek(sim_fd, offset, whence);
307 result = TheISA::htog(result);
308
309 if (result == (off_t)-1) {
310 //The seek failed.
311 return -errno;
312 } else {
313 // The seek succeeded.
314 // Copy "result" to "result_ptr"
315 // XXX We'll assume that the size of loff_t is 64 bits on the
316 // target platform
317 BufferArg result_buf(result_ptr, sizeof(result));
318 memcpy(result_buf.bufferPtr(), &result, sizeof(result));
319 result_buf.copyOut(tc->getMemProxy());
320 return 0;
321 }
322}
323
324
325SyscallReturn
326munmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
327{
328 // given that we don't really implement mmap, munmap is really easy
329 return 0;
330}
331
332
333const char *hostname = "m5.eecs.umich.edu";
334
335SyscallReturn
336gethostnameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
337{
338 int index = 0;
339 Addr bufPtr = p->getSyscallArg(tc, index);
340 int name_len = p->getSyscallArg(tc, index);
341 BufferArg name(bufPtr, name_len);
342
343 strncpy((char *)name.bufferPtr(), hostname, name_len);
344
345 name.copyOut(tc->getMemProxy());
346
347 return 0;
348}
349
350SyscallReturn
351getcwdFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
352{
353 int result = 0;
354 int index = 0;
355 Addr bufPtr = p->getSyscallArg(tc, index);
356 unsigned long size = p->getSyscallArg(tc, index);
357 BufferArg buf(bufPtr, size);
358
359 // Is current working directory defined?
360 string cwd = p->getcwd();
361 if (!cwd.empty()) {
362 if (cwd.length() >= size) {
363 // Buffer too small
364 return -ERANGE;
365 }
366 strncpy((char *)buf.bufferPtr(), cwd.c_str(), size);
367 result = cwd.length();
368 } else {
369 if (getcwd((char *)buf.bufferPtr(), size) != NULL) {
370 result = strlen((char *)buf.bufferPtr());
371 } else {
372 result = -1;
373 }
374 }
375
376 buf.copyOut(tc->getMemProxy());
377
378 return (result == -1) ? -errno : result;
379}
380
381/// Target open() handler.
382SyscallReturn
383readlinkFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
384 ThreadContext *tc)
385{
386 return readlinkFunc(desc, callnum, process, tc, 0);
387}
388
389SyscallReturn
390readlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
391 int index)
392{
393 string path;
394
395 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
396 return -EFAULT;
397
398 // Adjust path for current working directory
399 path = p->fullPath(path);
400
401 Addr bufPtr = p->getSyscallArg(tc, index);
402 size_t bufsiz = p->getSyscallArg(tc, index);
403
404 BufferArg buf(bufPtr, bufsiz);
405
406 int result = -1;
407 if (path != "/proc/self/exe") {
408 result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz);
409 } else {
410 // readlink() will return the path of the binary given
411 // with the -c option, however it is possible that this
412 // will still result in incorrect behavior if one binary
413 // runs another, e.g., -c time -o "my_binary" where
414 // my_binary calls readlink(). this is a very unlikely case,
415 // so we issue a warning.
416 warn_once("readlink may yield unexpected results if multiple "
417 "binaries are used\n");
418 if (strlen(p->progName()) > bufsiz) {
419 // readlink will truncate the contents of the
420 // path to ensure it is no more than bufsiz
421 strncpy((char*)buf.bufferPtr(), p->progName(), bufsiz);
422 result = bufsiz;
423 } else {
424 // return the program's working path rather
425 // than the one for the gem5 binary itself.
426 strcpy((char*)buf.bufferPtr(), p->progName());
427 result = strlen((char*)buf.bufferPtr());
428 }
429 }
430
431 buf.copyOut(tc->getMemProxy());
432
433 return (result == -1) ? -errno : result;
434}
435
436SyscallReturn
437unlinkFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
438{
439 return unlinkHelper(desc, num, p, tc, 0);
440}
441
442SyscallReturn
443unlinkHelper(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
444 int index)
445{
446 string path;
447
448 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
449 return -EFAULT;
450
451 // Adjust path for current working directory
452 path = p->fullPath(path);
453
454 int result = unlink(path.c_str());
455 return (result == -1) ? -errno : result;
456}
457
458
459SyscallReturn
460mkdirFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
461{
462 string path;
463
464 int index = 0;
465 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
466 return -EFAULT;
467
468 // Adjust path for current working directory
469 path = p->fullPath(path);
470
471 mode_t mode = p->getSyscallArg(tc, index);
472
473 int result = mkdir(path.c_str(), mode);
474 return (result == -1) ? -errno : result;
475}
476
477SyscallReturn
478renameFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
479{
480 string old_name;
481
482 int index = 0;
483 if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index)))
484 return -EFAULT;
485
486 string new_name;
487
488 if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index)))
489 return -EFAULT;
490
491 // Adjust path for current working directory
492 old_name = p->fullPath(old_name);
493 new_name = p->fullPath(new_name);
494
495 int64_t result = rename(old_name.c_str(), new_name.c_str());
496 return (result == -1) ? -errno : result;
497}
498
499SyscallReturn
500truncateFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
501{
502 string path;
503
504 int index = 0;
505 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
506 return -EFAULT;
507
508 off_t length = p->getSyscallArg(tc, index);
509
510 // Adjust path for current working directory
511 path = p->fullPath(path);
512
513 int result = truncate(path.c_str(), length);
514 return (result == -1) ? -errno : result;
515}
516
517SyscallReturn
518ftruncateFunc(SyscallDesc *desc, int num,
519 LiveProcess *process, ThreadContext *tc)
520{
521 int index = 0;
522 int tgt_fd = process->getSyscallArg(tc, index);
523 off_t length = process->getSyscallArg(tc, index);
524
525 int sim_fd = process->getSimFD(tgt_fd);
526 if (sim_fd < 0)
527 return -EBADF;
528
529 int result = ftruncate(sim_fd, length);
530 return (result == -1) ? -errno : result;
531}
532
533SyscallReturn
534truncate64Func(SyscallDesc *desc, int num,
535 LiveProcess *process, ThreadContext *tc)
536{
537 int index = 0;
538 string path;
539
540 if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index)))
541 return -EFAULT;
542
543 int64_t length = process->getSyscallArg(tc, index, 64);
544
545 // Adjust path for current working directory
546 path = process->fullPath(path);
547
548#if NO_STAT64
549 int result = truncate(path.c_str(), length);
550#else
551 int result = truncate64(path.c_str(), length);
552#endif
553 return (result == -1) ? -errno : result;
554}
555
556SyscallReturn
557ftruncate64Func(SyscallDesc *desc, int num,
558 LiveProcess *process, ThreadContext *tc)
559{
560 int index = 0;
561 int tgt_fd = process->getSyscallArg(tc, index);
562 int64_t length = process->getSyscallArg(tc, index, 64);
563
564 int sim_fd = process->getSimFD(tgt_fd);
565 if (sim_fd < 0)
566 return -EBADF;
567
568#if NO_STAT64
569 int result = ftruncate(sim_fd, length);
570#else
571 int result = ftruncate64(sim_fd, length);
572#endif
573 return (result == -1) ? -errno : result;
574}
575
576SyscallReturn
577umaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
578{
579 // Letting the simulated program change the simulator's umask seems like
580 // a bad idea. Compromise by just returning the current umask but not
581 // changing anything.
582 mode_t oldMask = umask(0);
583 umask(oldMask);
584 return (int)oldMask;
585}
586
587SyscallReturn
588chownFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
589{
590 string path;
591
592 int index = 0;
593 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
594 return -EFAULT;
595
596 /* XXX endianess */
597 uint32_t owner = p->getSyscallArg(tc, index);
598 uid_t hostOwner = owner;
599 uint32_t group = p->getSyscallArg(tc, index);
600 gid_t hostGroup = group;
601
602 // Adjust path for current working directory
603 path = p->fullPath(path);
604
605 int result = chown(path.c_str(), hostOwner, hostGroup);
606 return (result == -1) ? -errno : result;
607}
608
609SyscallReturn
610fchownFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
611{
612 int index = 0;
613 int tgt_fd = process->getSyscallArg(tc, index);
614
615 int sim_fd = process->getSimFD(tgt_fd);
616 if (sim_fd < 0)
617 return -EBADF;
618
619 /* XXX endianess */
620 uint32_t owner = process->getSyscallArg(tc, index);
621 uid_t hostOwner = owner;
622 uint32_t group = process->getSyscallArg(tc, index);
623 gid_t hostGroup = group;
624
625 int result = fchown(sim_fd, hostOwner, hostGroup);
626 return (result == -1) ? -errno : result;
627}
628
629
630SyscallReturn
631dupFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
632{
633 int index = 0;
634 int tgt_fd = process->getSyscallArg(tc, index);
635
636 int sim_fd = process->getSimFD(tgt_fd);
637 if (sim_fd < 0)
638 return -EBADF;
639
640 FDEntry *fde = process->getFDEntry(tgt_fd);
641
642 int result = dup(sim_fd);
643 return (result == -1) ? -errno :
644 process->allocFD(result, fde->filename, fde->flags, fde->mode, false);
645}
646
647
648SyscallReturn
649fcntlFunc(SyscallDesc *desc, int num, LiveProcess *process,
650 ThreadContext *tc)
651{
652 int index = 0;
653 int tgt_fd = process->getSyscallArg(tc, index);
654
655 int sim_fd = process->getSimFD(tgt_fd);
656 if (sim_fd < 0)
657 return -EBADF;
658
659 int cmd = process->getSyscallArg(tc, index);
660 switch (cmd) {
661 case 0: // F_DUPFD
662 // if we really wanted to support this, we'd need to do it
663 // in the target fd space.
664 warn("fcntl(%d, F_DUPFD) not supported, error returned\n", tgt_fd);
665 return -EMFILE;
666
667 case 1: // F_GETFD (get close-on-exec flag)
668 case 2: // F_SETFD (set close-on-exec flag)
669 return 0;
670
671 case 3: // F_GETFL (get file flags)
672 case 4: // F_SETFL (set file flags)
673 // not sure if this is totally valid, but we'll pass it through
674 // to the underlying OS
675 warn("fcntl(%d, %d) passed through to host\n", tgt_fd, cmd);
676 return fcntl(sim_fd, cmd);
677 // return 0;
678
679 case 7: // F_GETLK (get lock)
680 case 8: // F_SETLK (set lock)
681 case 9: // F_SETLKW (set lock and wait)
682 // don't mess with file locking... just act like it's OK
683 warn("File lock call (fcntl(%d, %d)) ignored.\n", tgt_fd, cmd);
684 return 0;
685
686 default:
687 warn("Unknown fcntl command %d\n", cmd);
688 return 0;
689 }
690}
691
692SyscallReturn
693fcntl64Func(SyscallDesc *desc, int num, LiveProcess *process,
694 ThreadContext *tc)
695{
696 int index = 0;
697 int tgt_fd = process->getSyscallArg(tc, index);
698
699 int sim_fd = process->getSimFD(tgt_fd);
700 if (sim_fd < 0)
701 return -EBADF;
702
703 int cmd = process->getSyscallArg(tc, index);
704 switch (cmd) {
705 case 33: //F_GETLK64
706 warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd);
707 return -EMFILE;
708
709 case 34: // F_SETLK64
710 case 35: // F_SETLKW64
711 warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n",
712 tgt_fd);
713 return -EMFILE;
714
715 default:
716 // not sure if this is totally valid, but we'll pass it through
717 // to the underlying OS
718 warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd);
719 return fcntl(sim_fd, cmd);
720 // return 0;
721 }
722}
723
724SyscallReturn
725pipePseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
726 ThreadContext *tc)
727{
728 int fds[2], sim_fds[2];
729 int pipe_retval = pipe(fds);
730
731 if (pipe_retval < 0) {
732 // error
733 return pipe_retval;
734 }
735
736 sim_fds[0] = process->allocFD(fds[0], "PIPE-READ", O_WRONLY, -1, true);
737 sim_fds[1] = process->allocFD(fds[1], "PIPE-WRITE", O_RDONLY, -1, true);
738
739 process->setReadPipeSource(sim_fds[0], sim_fds[1]);
740 // Alpha Linux convention for pipe() is that fd[0] is returned as
741 // the return value of the function, and fd[1] is returned in r20.
742 tc->setIntReg(SyscallPseudoReturnReg, sim_fds[1]);
743 return sim_fds[0];
744}
745
746
747SyscallReturn
748getpidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
749 ThreadContext *tc)
750{
751 // Make up a PID. There's no interprocess communication in
752 // fake_syscall mode, so there's no way for a process to know it's
753 // not getting a unique value.
754
755 tc->setIntReg(SyscallPseudoReturnReg, process->ppid());
756 return process->pid();
757}
758
759
760SyscallReturn
761getuidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
762 ThreadContext *tc)
763{
764 // Make up a UID and EUID... it shouldn't matter, and we want the
765 // simulation to be deterministic.
766
767 // EUID goes in r20.
768 tc->setIntReg(SyscallPseudoReturnReg, process->euid()); //EUID
769 return process->uid(); // UID
770}
771
772
773SyscallReturn
774getgidPseudoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
775 ThreadContext *tc)
776{
777 // Get current group ID. EGID goes in r20.
778 tc->setIntReg(SyscallPseudoReturnReg, process->egid()); //EGID
779 return process->gid();
780}
781
782
783SyscallReturn
784setuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
785 ThreadContext *tc)
786{
787 // can't fathom why a benchmark would call this.
788 int index = 0;
789 warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index));
790 return 0;
791}
792
793SyscallReturn
794getpidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
795 ThreadContext *tc)
796{
797 // Make up a PID. There's no interprocess communication in
798 // fake_syscall mode, so there's no way for a process to know it's
799 // not getting a unique value.
800
801 tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); //PID
802 return process->pid();
803}
804
805SyscallReturn
806getppidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
807 ThreadContext *tc)
808{
809 return process->ppid();
810}
811
812SyscallReturn
813getuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
814 ThreadContext *tc)
815{
816 return process->uid(); // UID
817}
818
819SyscallReturn
820geteuidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
821 ThreadContext *tc)
822{
823 return process->euid(); // UID
824}
825
826SyscallReturn
827getgidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
828 ThreadContext *tc)
829{
830 return process->gid();
831}
832
833SyscallReturn
834getegidFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
835 ThreadContext *tc)
836{
837 return process->egid();
838}
839
840
841SyscallReturn
842cloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
843 ThreadContext *tc)
844{
845 int index = 0;
846 IntReg flags = process->getSyscallArg(tc, index);
847 IntReg newStack = process->getSyscallArg(tc, index);
848
849 DPRINTF(SyscallVerbose, "In sys_clone:\n");
850 DPRINTF(SyscallVerbose, " Flags=%llx\n", flags);
851 DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack);
852
853
854 if (flags != 0x10f00) {
855 warn("This sys_clone implementation assumes flags "
856 "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD "
857 "(0x10f00), and may not work correctly with given flags "
858 "0x%llx\n", flags);
859 }
860
861 ThreadContext* ctc; // child thread context
862 if ( ( ctc = process->findFreeContext() ) != NULL ) {
863 DPRINTF(SyscallVerbose, " Found unallocated thread context\n");
864
865 ctc->clearArchRegs();
866
867 // Arch-specific cloning code
868 #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA
869 // Cloning the misc. regs for these archs is enough
870 TheISA::copyMiscRegs(tc, ctc);
871 #elif THE_ISA == SPARC_ISA
872 TheISA::copyRegs(tc, ctc);
873
874 // TODO: Explain what this code actually does :-)
875 ctc->setIntReg(NumIntArchRegs + 6, 0);
876 ctc->setIntReg(NumIntArchRegs + 4, 0);
877 ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2);
878 ctc->setIntReg(NumIntArchRegs + 5, NWindows);
879 ctc->setMiscReg(MISCREG_CWP, 0);
880 ctc->setIntReg(NumIntArchRegs + 7, 0);
881 ctc->setMiscRegNoEffect(MISCREG_TL, 0);
882 ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY);
883
884 for (int y = 8; y < 32; y++)
885 ctc->setIntReg(y, tc->readIntReg(y));
886 #elif THE_ISA == ARM_ISA
887 TheISA::copyRegs(tc, ctc);
888 #else
889 fatal("sys_clone is not implemented for this ISA\n");
890 #endif
891
892 // Set up stack register
893 ctc->setIntReg(TheISA::StackPointerReg, newStack);
894
895 // Set up syscall return values in parent and child
896 ctc->setIntReg(ReturnValueReg, 0); // return value, child
897
898 // Alpha needs SyscallSuccessReg=0 in child
899 #if THE_ISA == ALPHA_ISA
900 ctc->setIntReg(TheISA::SyscallSuccessReg, 0);
901 #endif
902
903 // In SPARC/Linux, clone returns 0 on pseudo-return register if
904 // parent, non-zero if child
905 #if THE_ISA == SPARC_ISA
906 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0);
907 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1);
908 #endif
909
910 ctc->pcState(tc->nextInstAddr());
911
912 ctc->activate();
913
914 // Should return nonzero child TID in parent's syscall return register,
915 // but for our pthread library any non-zero value will work
916 return 1;
917 } else {
918 fatal("Called sys_clone, but no unallocated thread contexts found!\n");
919 return 0;
920 }
921}
922
923SyscallReturn
924accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc,
925 int index)
926{
927 string path;
928 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
929 return -EFAULT;
930
931 // Adjust path for current working directory
932 path = p->fullPath(path);
933
934 mode_t mode = p->getSyscallArg(tc, index);
935
936 int result = access(path.c_str(), mode);
937 return (result == -1) ? -errno : result;
938}
939
940SyscallReturn
941accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc)
942{
943 return accessFunc(desc, callnum, p, tc, 0);
944}
945