1/*
2 * Copyright (c) 2012-2013, 2015 ARM Limited
3 * Copyright (c) 2015 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder. You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2003-2005 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Steve Reinhardt
42 * Kevin Lim
43 */
44
45#ifndef __SIM_SYSCALL_EMUL_HH__
46#define __SIM_SYSCALL_EMUL_HH__
47
48#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
49 defined(__FreeBSD__) || defined(__CYGWIN__) || \
50 defined(__NetBSD__))
51
52///
53/// @file syscall_emul.hh
54///
55/// This file defines objects used to emulate syscalls from the target
56/// application on the host machine.
57
58#ifdef __CYGWIN32__
59#include <sys/fcntl.h> // for O_BINARY
60
61#endif
62#include <fcntl.h>
63#include <sys/mman.h>
64#include <sys/stat.h>
65#include <sys/time.h>
66#include <sys/uio.h>
67#include <unistd.h>
68
69#include <cerrno>
70#include <string>
71
72#include "base/chunk_generator.hh"
73#include "base/intmath.hh" // for RoundUp
74#include "base/loader/object_file.hh"
75#include "base/misc.hh"
76#include "base/trace.hh"
77#include "base/types.hh"
78#include "config/the_isa.hh"
79#include "cpu/base.hh"
80#include "cpu/thread_context.hh"
81#include "debug/SyscallBase.hh"
82#include "debug/SyscallVerbose.hh"
83#include "mem/page_table.hh"
84#include "sim/byteswap.hh"
85#include "sim/emul_driver.hh"
86#include "sim/process.hh"
87#include "sim/syscall_emul_buf.hh"
88#include "sim/syscallreturn.hh"
89#include "sim/system.hh"
90
91// This wrapper macro helps out with readability a bit. FLAGEXT specifies
92// the verbosity and FMT is the message to be appended to the syscall
93// header information. The syscall header information contains the cpuid
94// and thread id.
95#define DPRINTF_SYSCALL(FLAGEXT, FMT, ...) \
96 DPRINTFS(Syscall##FLAGEXT, tc->getCpuPtr(), "T%d : syscall " FMT, \
97 tc->threadId(), __VA_ARGS__)
98
99///
100/// System call descriptor.
101///
102class SyscallDesc {
103
104 public:
105
106 /// Typedef for target syscall handler functions.
107 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
108 LiveProcess *, ThreadContext *);
109
110 const char *name; //!< Syscall name (e.g., "open").
111 FuncPtr funcPtr; //!< Pointer to emulation function.
112 int flags; //!< Flags (see Flags enum).
113 bool warned; //!< Have we warned about unimplemented syscall?
114
115 /// Flag values for controlling syscall behavior.
116 enum Flags {
117 /// Don't set return regs according to funcPtr return value.
118 /// Used for syscalls with non-standard return conventions
119 /// that explicitly set the ThreadContext regs (e.g.,
120 /// sigreturn).
121 SuppressReturnValue = 1,
122 WarnOnce = 2
123 };
124
125 /// Constructor.
126 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
127 : name(_name), funcPtr(_funcPtr), flags(_flags), warned(false)
128 {
129 }
130
131 /// Emulate the syscall. Public interface for calling through funcPtr.
132 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
133
134 /// Is the WarnOnce flag set?
135 bool warnOnce() const { return (flags & WarnOnce); }
136};
137
138
139//////////////////////////////////////////////////////////////////////
140//
141// The following emulation functions are generic enough that they
142// don't need to be recompiled for different emulated OS's. They are
143// defined in sim/syscall_emul.cc.
144//
145//////////////////////////////////////////////////////////////////////
146
147
148/// Handler for unimplemented syscalls that we haven't thought about.
149SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
150 LiveProcess *p, ThreadContext *tc);
151
152/// Handler for unimplemented syscalls that we never intend to
153/// implement (signal handling, etc.) and should not affect the correct
154/// behavior of the program. Print a warning only if the appropriate
155/// trace flag is enabled. Return success to the target program.
156SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
157 LiveProcess *p, ThreadContext *tc);
158
159/// Target exit() handler: terminate current context.
160SyscallReturn exitFunc(SyscallDesc *desc, int num,
161 LiveProcess *p, ThreadContext *tc);
162
163/// Target exit_group() handler: terminate simulation. (exit all threads)
164SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
165 LiveProcess *p, ThreadContext *tc);
166
167/// Target getpagesize() handler.
168SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
169 LiveProcess *p, ThreadContext *tc);
170
171/// Target brk() handler: set brk address.
172SyscallReturn brkFunc(SyscallDesc *desc, int num,
173 LiveProcess *p, ThreadContext *tc);
174
175/// Target close() handler.
176SyscallReturn closeFunc(SyscallDesc *desc, int num,
177 LiveProcess *p, ThreadContext *tc);
178
179/// Target read() handler.
180SyscallReturn readFunc(SyscallDesc *desc, int num,
181 LiveProcess *p, ThreadContext *tc);
182
183/// Target write() handler.
184SyscallReturn writeFunc(SyscallDesc *desc, int num,
185 LiveProcess *p, ThreadContext *tc);
186
187/// Target lseek() handler.
188SyscallReturn lseekFunc(SyscallDesc *desc, int num,
189 LiveProcess *p, ThreadContext *tc);
190
191/// Target _llseek() handler.
192SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
193 LiveProcess *p, ThreadContext *tc);
194
195/// Target munmap() handler.
196SyscallReturn munmapFunc(SyscallDesc *desc, int num,
197 LiveProcess *p, ThreadContext *tc);
198
199/// Target gethostname() handler.
200SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
201 LiveProcess *p, ThreadContext *tc);
202
203/// Target getcwd() handler.
204SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
205 LiveProcess *p, ThreadContext *tc);
206
207/// Target readlink() handler.
208SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
209 LiveProcess *p, ThreadContext *tc,
210 int index = 0);
211SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
212 LiveProcess *p, ThreadContext *tc);
213
214/// Target unlink() handler.
215SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
216 LiveProcess *p, ThreadContext *tc,
217 int index);
218SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
219 LiveProcess *p, ThreadContext *tc);
220
221/// Target mkdir() handler.
222SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
223 LiveProcess *p, ThreadContext *tc);
224
225/// Target rename() handler.
226SyscallReturn renameFunc(SyscallDesc *desc, int num,
227 LiveProcess *p, ThreadContext *tc);
228
229
230/// Target truncate() handler.
231SyscallReturn truncateFunc(SyscallDesc *desc, int num,
232 LiveProcess *p, ThreadContext *tc);
233
234
235/// Target ftruncate() handler.
236SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
237 LiveProcess *p, ThreadContext *tc);
238
239
240/// Target truncate64() handler.
241SyscallReturn truncate64Func(SyscallDesc *desc, int num,
242 LiveProcess *p, ThreadContext *tc);
243
244/// Target ftruncate64() handler.
245SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
246 LiveProcess *p, ThreadContext *tc);
247
248
249/// Target umask() handler.
250SyscallReturn umaskFunc(SyscallDesc *desc, int num,
251 LiveProcess *p, ThreadContext *tc);
252
253
254/// Target chown() handler.
255SyscallReturn chownFunc(SyscallDesc *desc, int num,
256 LiveProcess *p, ThreadContext *tc);
257
258
259/// Target fchown() handler.
260SyscallReturn fchownFunc(SyscallDesc *desc, int num,
261 LiveProcess *p, ThreadContext *tc);
262
263/// Target dup() handler.
264SyscallReturn dupFunc(SyscallDesc *desc, int num,
265 LiveProcess *process, ThreadContext *tc);
266
267/// Target fnctl() handler.
268SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
269 LiveProcess *process, ThreadContext *tc);
270
271/// Target fcntl64() handler.
272SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
273 LiveProcess *process, ThreadContext *tc);
274
275/// Target setuid() handler.
276SyscallReturn setuidFunc(SyscallDesc *desc, int num,
277 LiveProcess *p, ThreadContext *tc);
278
279/// Target getpid() handler.
280SyscallReturn getpidFunc(SyscallDesc *desc, int num,
281 LiveProcess *p, ThreadContext *tc);
282
283/// Target getuid() handler.
284SyscallReturn getuidFunc(SyscallDesc *desc, int num,
285 LiveProcess *p, ThreadContext *tc);
286
287/// Target getgid() handler.
288SyscallReturn getgidFunc(SyscallDesc *desc, int num,
289 LiveProcess *p, ThreadContext *tc);
290
291/// Target getppid() handler.
292SyscallReturn getppidFunc(SyscallDesc *desc, int num,
293 LiveProcess *p, ThreadContext *tc);
294
295/// Target geteuid() handler.
296SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
297 LiveProcess *p, ThreadContext *tc);
298
299/// Target getegid() handler.
300SyscallReturn getegidFunc(SyscallDesc *desc, int num,
301 LiveProcess *p, ThreadContext *tc);
302
303/// Target clone() handler.
304SyscallReturn cloneFunc(SyscallDesc *desc, int num,
305 LiveProcess *p, ThreadContext *tc);
306
307/// Target access() handler
308SyscallReturn accessFunc(SyscallDesc *desc, int num,
309 LiveProcess *p, ThreadContext *tc);
310SyscallReturn accessFunc(SyscallDesc *desc, int num,
311 LiveProcess *p, ThreadContext *tc,
312 int index);
313
314/// Futex system call
315/// Implemented by Daniel Sanchez
316/// Used by printf's in multi-threaded apps
317template <class OS>
318SyscallReturn
319futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
320 ThreadContext *tc)
321{
322 int index_uaddr = 0;
323 int index_op = 1;
324 int index_val = 2;
325 int index_timeout = 3;
326
327 uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
328 int op = process->getSyscallArg(tc, index_op);
329 int val = process->getSyscallArg(tc, index_val);
330 uint64_t timeout = process->getSyscallArg(tc, index_timeout);
331
332 std::map<uint64_t, std::list<ThreadContext *> * >
333 &futex_map = tc->getSystemPtr()->futexMap;
334
335 DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
336 uaddr, op, val);
337
338 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
339
340 if (op == OS::TGT_FUTEX_WAIT) {
341 if (timeout != 0) {
342 warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
343 "we'll wait indefinitely");
344 }
345
346 uint8_t *buf = new uint8_t[sizeof(int)];
347 tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
348 int mem_val = *((int *)buf);
349 delete[] buf;
350
351 if (val != mem_val) {
352 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
353 "expected: %d\n", mem_val, val);
354 return -OS::TGT_EWOULDBLOCK;
355 }
356
357 // Queue the thread context
358 std::list<ThreadContext *> * tcWaitList;
359 if (futex_map.count(uaddr)) {
360 tcWaitList = futex_map.find(uaddr)->second;
361 } else {
362 tcWaitList = new std::list<ThreadContext *>();
363 futex_map.insert(std::pair< uint64_t,
364 std::list<ThreadContext *> * >(uaddr, tcWaitList));
365 }
366 tcWaitList->push_back(tc);
367 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
368 "thread context\n");
369 tc->suspend();
370 return 0;
371 } else if (op == OS::TGT_FUTEX_WAKE){
372 int wokenUp = 0;
373 std::list<ThreadContext *> * tcWaitList;
374 if (futex_map.count(uaddr)) {
375 tcWaitList = futex_map.find(uaddr)->second;
376 while (tcWaitList->size() > 0 && wokenUp < val) {
377 tcWaitList->front()->activate();
378 tcWaitList->pop_front();
379 wokenUp++;
380 }
381 if (tcWaitList->empty()) {
382 futex_map.erase(uaddr);
383 delete tcWaitList;
384 }
385 }
386 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
387 "thread contexts\n", wokenUp);
388 return wokenUp;
389 } else {
390 warn("sys_futex: op %d is not implemented, just returning...", op);
391 return 0;
392 }
393
394}
395
396
397/// Pseudo Funcs - These functions use a different return convension,
398/// returning a second value in a register other than the normal return register
399SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
400 LiveProcess *process, ThreadContext *tc);
401
402/// Target getpidPseudo() handler.
403SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
404 LiveProcess *p, ThreadContext *tc);
405
406/// Target getuidPseudo() handler.
407SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
408 LiveProcess *p, ThreadContext *tc);
409
410/// Target getgidPseudo() handler.
411SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
412 LiveProcess *p, ThreadContext *tc);
413
414
415/// A readable name for 1,000,000, for converting microseconds to seconds.
416const int one_million = 1000000;
417/// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
418const int one_billion = 1000000000;
419
420/// Approximate seconds since the epoch (1/1/1970). About a billion,
421/// by my reckoning. We want to keep this a constant (not use the
422/// real-world time) to keep simulations repeatable.
423const unsigned seconds_since_epoch = 1000000000;
424
425/// Helper function to convert current elapsed time to seconds and
426/// microseconds.
427template <class T1, class T2>
428void
429getElapsedTimeMicro(T1 &sec, T2 &usec)
430{
431 uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
432 sec = elapsed_usecs / one_million;
433 usec = elapsed_usecs % one_million;
434}
435
436/// Helper function to convert current elapsed time to seconds and
437/// nanoseconds.
438template <class T1, class T2>
439void
440getElapsedTimeNano(T1 &sec, T2 &nsec)
441{
442 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
443 sec = elapsed_nsecs / one_billion;
444 nsec = elapsed_nsecs % one_billion;
445}
446
447//////////////////////////////////////////////////////////////////////
448//
449// The following emulation functions are generic, but need to be
450// templated to account for differences in types, constants, etc.
451//
452//////////////////////////////////////////////////////////////////////
453
454#if NO_STAT64
455 typedef struct stat hst_stat;
456 typedef struct stat hst_stat64;
457#else
458 typedef struct stat hst_stat;
459 typedef struct stat64 hst_stat64;
460#endif
461
462//// Helper function to convert a host stat buffer to a target stat
463//// buffer. Also copies the target buffer out to the simulated
464//// memory space. Used by stat(), fstat(), and lstat().
465
466template <typename target_stat, typename host_stat>
467static void
468convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
469{
470 using namespace TheISA;
471
472 if (fakeTTY)
473 tgt->st_dev = 0xA;
474 else
475 tgt->st_dev = host->st_dev;
476 tgt->st_dev = TheISA::htog(tgt->st_dev);
477 tgt->st_ino = host->st_ino;
478 tgt->st_ino = TheISA::htog(tgt->st_ino);
479 tgt->st_mode = host->st_mode;
480 if (fakeTTY) {
481 // Claim to be a character device
482 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
483 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
484 }
485 tgt->st_mode = TheISA::htog(tgt->st_mode);
486 tgt->st_nlink = host->st_nlink;
487 tgt->st_nlink = TheISA::htog(tgt->st_nlink);
488 tgt->st_uid = host->st_uid;
489 tgt->st_uid = TheISA::htog(tgt->st_uid);
490 tgt->st_gid = host->st_gid;
491 tgt->st_gid = TheISA::htog(tgt->st_gid);
492 if (fakeTTY)
493 tgt->st_rdev = 0x880d;
494 else
495 tgt->st_rdev = host->st_rdev;
496 tgt->st_rdev = TheISA::htog(tgt->st_rdev);
497 tgt->st_size = host->st_size;
498 tgt->st_size = TheISA::htog(tgt->st_size);
499 tgt->st_atimeX = host->st_atime;
500 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
501 tgt->st_mtimeX = host->st_mtime;
502 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
503 tgt->st_ctimeX = host->st_ctime;
504 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
505 // Force the block size to be 8k. This helps to ensure buffered io works
506 // consistently across different hosts.
507 tgt->st_blksize = 0x2000;
508 tgt->st_blksize = TheISA::htog(tgt->st_blksize);
509 tgt->st_blocks = host->st_blocks;
510 tgt->st_blocks = TheISA::htog(tgt->st_blocks);
511}
512
513// Same for stat64
514
515template <typename target_stat, typename host_stat64>
516static void
517convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
518{
519 using namespace TheISA;
520
521 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
522#if defined(STAT_HAVE_NSEC)
523 tgt->st_atime_nsec = host->st_atime_nsec;
524 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
525 tgt->st_mtime_nsec = host->st_mtime_nsec;
526 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
527 tgt->st_ctime_nsec = host->st_ctime_nsec;
528 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
529#else
530 tgt->st_atime_nsec = 0;
531 tgt->st_mtime_nsec = 0;
532 tgt->st_ctime_nsec = 0;
533#endif
534}
535
536//Here are a couple convenience functions
537template<class OS>
538static void
539copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
540 hst_stat *host, bool fakeTTY = false)
541{
542 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
543 tgt_stat_buf tgt(addr);
544 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
545 tgt.copyOut(mem);
546}
547
548template<class OS>
549static void
550copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
551 hst_stat64 *host, bool fakeTTY = false)
552{
553 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
554 tgt_stat_buf tgt(addr);
555 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
556 tgt.copyOut(mem);
557}
558
559/// Target ioctl() handler. For the most part, programs call ioctl()
560/// only to find out if their stdout is a tty, to determine whether to
561/// do line or block buffering. We always claim that output fds are
562/// not TTYs to provide repeatable results.
563template <class OS>
564SyscallReturn
565ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
566 ThreadContext *tc)
567{
568 int index = 0;
569 int tgt_fd = process->getSyscallArg(tc, index);
570 unsigned req = process->getSyscallArg(tc, index);
571
572 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req);
573
574 FDEntry *fde = process->getFDEntry(tgt_fd);
575
576 if (fde == NULL) {
577 // doesn't map to any simulator fd: not a valid target fd
578 return -EBADF;
579 }
580
581 if (fde->driver != NULL) {
582 return fde->driver->ioctl(process, tc, req);
583 }
584
585 if (OS::isTtyReq(req)) {
586 return -ENOTTY;
587 }
588
589 warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
590 tgt_fd, req, tc->pcState());
591 return -ENOTTY;
592}
593
594template <class OS>
595static SyscallReturn
596openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
597 ThreadContext *tc, int index)
598{
599 std::string path;
600
601 if (!tc->getMemProxy().tryReadString(path,
602 process->getSyscallArg(tc, index)))
603 return -EFAULT;
604
605 int tgtFlags = process->getSyscallArg(tc, index);
606 int mode = process->getSyscallArg(tc, index);
607 int hostFlags = 0;
608
609 // translate open flags
610 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
611 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
612 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
613 hostFlags |= OS::openFlagTable[i].hostFlag;
614 }
615 }
616
617 // any target flags left?
618 if (tgtFlags != 0)
619 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
620
621#ifdef __CYGWIN32__
622 hostFlags |= O_BINARY;
623#endif
624
625 // Adjust path for current working directory
626 path = process->fullPath(path);
627
628 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
629
630 if (startswith(path, "/dev/")) {
631 std::string filename = path.substr(strlen("/dev/"));
632 if (filename == "sysdev0") {
633 // This is a memory-mapped high-resolution timer device on Alpha.
634 // We don't support it, so just punt.
635 warn("Ignoring open(%s, ...)\n", path);
636 return -ENOENT;
637 }
638
639 EmulatedDriver *drv = process->findDriver(filename);
640 if (drv != NULL) {
641 // the driver's open method will allocate a fd from the
642 // process if necessary.
643 return drv->open(process, tc, mode, hostFlags);
644 }
645
646 // fall through here for pass through to host devices, such as
647 // /dev/zero
648 }
649
650 int fd;
651 int local_errno;
652 if (startswith(path, "/proc/") || startswith(path, "/system/") ||
653 startswith(path, "/platform/") || startswith(path, "/sys/")) {
654 // It's a proc/sys entry and requires special handling
655 fd = OS::openSpecialFile(path, process, tc);
656 local_errno = ENOENT;
657 } else {
658 // open the file
659 fd = open(path.c_str(), hostFlags, mode);
660 local_errno = errno;
661 }
662
663 if (fd == -1)
664 return -local_errno;
665
666 return process->allocFD(fd, path.c_str(), hostFlags, mode, false);
667}
668
669/// Target open() handler.
670template <class OS>
671SyscallReturn
672openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
673 ThreadContext *tc)
674{
675 return openFunc<OS>(desc, callnum, process, tc, 0);
676}
677
678/// Target openat() handler.
679template <class OS>
680SyscallReturn
681openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
682 ThreadContext *tc)
683{
684 int index = 0;
685 int dirfd = process->getSyscallArg(tc, index);
686 if (dirfd != OS::TGT_AT_FDCWD)
687 warn("openat: first argument not AT_FDCWD; unlikely to work");
688 return openFunc<OS>(desc, callnum, process, tc, 1);
689}
690
691/// Target unlinkat() handler.
692template <class OS>
693SyscallReturn
694unlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
695 ThreadContext *tc)
696{
697 int index = 0;
698 int dirfd = process->getSyscallArg(tc, index);
699 if (dirfd != OS::TGT_AT_FDCWD)
700 warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
701
702 return unlinkHelper(desc, callnum, process, tc, 1);
703}
704
705/// Target facessat() handler
706template <class OS>
707SyscallReturn
708faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
709 ThreadContext *tc)
710{
711 int index = 0;
712 int dirfd = process->getSyscallArg(tc, index);
713 if (dirfd != OS::TGT_AT_FDCWD)
714 warn("faccessat: first argument not AT_FDCWD; unlikely to work");
715 return accessFunc(desc, callnum, process, tc, 1);
716}
717
718/// Target readlinkat() handler
719template <class OS>
720SyscallReturn
721readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
722 ThreadContext *tc)
723{
724 int index = 0;
725 int dirfd = process->getSyscallArg(tc, index);
726 if (dirfd != OS::TGT_AT_FDCWD)
727 warn("openat: first argument not AT_FDCWD; unlikely to work");
728 return readlinkFunc(desc, callnum, process, tc, 1);
729}
730
731/// Target renameat() handler.
732template <class OS>
733SyscallReturn
734renameatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
735 ThreadContext *tc)
736{
737 int index = 0;
738
739 int olddirfd = process->getSyscallArg(tc, index);
740 if (olddirfd != OS::TGT_AT_FDCWD)
741 warn("renameat: first argument not AT_FDCWD; unlikely to work");
742
743 std::string old_name;
744
745 if (!tc->getMemProxy().tryReadString(old_name,
746 process->getSyscallArg(tc, index)))
747 return -EFAULT;
748
749 int newdirfd = process->getSyscallArg(tc, index);
750 if (newdirfd != OS::TGT_AT_FDCWD)
751 warn("renameat: third argument not AT_FDCWD; unlikely to work");
752
753 std::string new_name;
754
755 if (!tc->getMemProxy().tryReadString(new_name,
756 process->getSyscallArg(tc, index)))
757 return -EFAULT;
758
759 // Adjust path for current working directory
760 old_name = process->fullPath(old_name);
761 new_name = process->fullPath(new_name);
762
763 int result = rename(old_name.c_str(), new_name.c_str());
764 return (result == -1) ? -errno : result;
765}
766
767/// Target sysinfo() handler.
768template <class OS>
769SyscallReturn
770sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
771 ThreadContext *tc)
772{
773
774 int index = 0;
775 TypedBufferArg<typename OS::tgt_sysinfo>
776 sysinfo(process->getSyscallArg(tc, index));
777
778 sysinfo->uptime=seconds_since_epoch;
779 sysinfo->totalram=process->system->memSize();
780
781 sysinfo.copyOut(tc->getMemProxy());
782
783 return 0;
784}
785
786/// Target chmod() handler.
787template <class OS>
788SyscallReturn
789chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
790 ThreadContext *tc)
791{
792 std::string path;
793
794 int index = 0;
795 if (!tc->getMemProxy().tryReadString(path,
796 process->getSyscallArg(tc, index))) {
797 return -EFAULT;
798 }
799
800 uint32_t mode = process->getSyscallArg(tc, index);
801 mode_t hostMode = 0;
802
803 // XXX translate mode flags via OS::something???
804 hostMode = mode;
805
806 // Adjust path for current working directory
807 path = process->fullPath(path);
808
809 // do the chmod
810 int result = chmod(path.c_str(), hostMode);
811 if (result < 0)
812 return -errno;
813
814 return 0;
815}
816
817
818/// Target fchmod() handler.
819template <class OS>
820SyscallReturn
821fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
822 ThreadContext *tc)
823{
824 int index = 0;
825 int tgt_fd = process->getSyscallArg(tc, index);
826 uint32_t mode = process->getSyscallArg(tc, index);
827
828 int sim_fd = process->getSimFD(tgt_fd);
829 if (sim_fd < 0)
830 return -EBADF;
831
832 mode_t hostMode = 0;
833
834 // XXX translate mode flags via OS::someting???
835 hostMode = mode;
836
837 // do the fchmod
838 int result = fchmod(sim_fd, hostMode);
839 if (result < 0)
840 return -errno;
841
842 return 0;
843}
844
845/// Target mremap() handler.
846template <class OS>
847SyscallReturn
848mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
849{
850 int index = 0;
851 Addr start = process->getSyscallArg(tc, index);
852 uint64_t old_length = process->getSyscallArg(tc, index);
853 uint64_t new_length = process->getSyscallArg(tc, index);
854 uint64_t flags = process->getSyscallArg(tc, index);
855 uint64_t provided_address = 0;
856 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
857
858 if (use_provided_address)
859 provided_address = process->getSyscallArg(tc, index);
860
861 if ((start % TheISA::PageBytes != 0) ||
862 (provided_address % TheISA::PageBytes != 0)) {
863 warn("mremap failing: arguments not page aligned");
864 return -EINVAL;
865 }
866
867 new_length = roundUp(new_length, TheISA::PageBytes);
868
869 if (new_length > old_length) {
870 if ((start + old_length) == process->mmap_end &&
871 (!use_provided_address || provided_address == start)) {
872 uint64_t diff = new_length - old_length;
873 process->allocateMem(process->mmap_end, diff);
874 process->mmap_end += diff;
875 return start;
876 } else {
877 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
878 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
879 return -ENOMEM;
880 } else {
881 uint64_t new_start = use_provided_address ?
882 provided_address : process->mmap_end;
883 process->pTable->remap(start, old_length, new_start);
884 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
885 new_start, new_start + new_length,
886 new_length - old_length);
887 // add on the remaining unallocated pages
888 process->allocateMem(new_start + old_length,
889 new_length - old_length,
890 use_provided_address /* clobber */);
891 if (!use_provided_address)
892 process->mmap_end += new_length;
893 if (use_provided_address &&
894 new_start + new_length > process->mmap_end) {
895 // something fishy going on here, at least notify the user
896 // @todo: increase mmap_end?
897 warn("mmap region limit exceeded with MREMAP_FIXED\n");
898 }
899 warn("returning %08p as start\n", new_start);
900 return new_start;
901 }
902 }
903 } else {
904 if (use_provided_address && provided_address != start)
905 process->pTable->remap(start, new_length, provided_address);
906 process->pTable->unmap(start + new_length, old_length - new_length);
907 return use_provided_address ? provided_address : start;
908 }
909}
910
911/// Target stat() handler.
912template <class OS>
913SyscallReturn
914statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
915 ThreadContext *tc)
916{
917 std::string path;
918
919 int index = 0;
920 if (!tc->getMemProxy().tryReadString(path,
921 process->getSyscallArg(tc, index))) {
922 return -EFAULT;
923 }
924 Addr bufPtr = process->getSyscallArg(tc, index);
925
926 // Adjust path for current working directory
927 path = process->fullPath(path);
928
929 struct stat hostBuf;
930 int result = stat(path.c_str(), &hostBuf);
931
932 if (result < 0)
933 return -errno;
934
935 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
936
937 return 0;
938}
939
940
941/// Target stat64() handler.
942template <class OS>
943SyscallReturn
944stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
945 ThreadContext *tc)
946{
947 std::string path;
948
949 int index = 0;
950 if (!tc->getMemProxy().tryReadString(path,
951 process->getSyscallArg(tc, index)))
952 return -EFAULT;
953 Addr bufPtr = process->getSyscallArg(tc, index);
954
955 // Adjust path for current working directory
956 path = process->fullPath(path);
957
958#if NO_STAT64
959 struct stat hostBuf;
960 int result = stat(path.c_str(), &hostBuf);
961#else
962 struct stat64 hostBuf;
963 int result = stat64(path.c_str(), &hostBuf);
964#endif
965
966 if (result < 0)
967 return -errno;
968
969 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
970
971 return 0;
972}
973
974
975/// Target fstatat64() handler.
976template <class OS>
977SyscallReturn
978fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
979 ThreadContext *tc)
980{
981 int index = 0;
982 int dirfd = process->getSyscallArg(tc, index);
983 if (dirfd != OS::TGT_AT_FDCWD)
984 warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
985
986 std::string path;
987 if (!tc->getMemProxy().tryReadString(path,
988 process->getSyscallArg(tc, index)))
989 return -EFAULT;
990 Addr bufPtr = process->getSyscallArg(tc, index);
991
992 // Adjust path for current working directory
993 path = process->fullPath(path);
994
995#if NO_STAT64
996 struct stat hostBuf;
997 int result = stat(path.c_str(), &hostBuf);
998#else
999 struct stat64 hostBuf;
1000 int result = stat64(path.c_str(), &hostBuf);
1001#endif
1002
1003 if (result < 0)
1004 return -errno;
1005
1006 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1007
1008 return 0;
1009}
1010
1011
1012/// Target fstat64() handler.
1013template <class OS>
1014SyscallReturn
1015fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1016 ThreadContext *tc)
1017{
1018 int index = 0;
1019 int tgt_fd = process->getSyscallArg(tc, index);
1020 Addr bufPtr = process->getSyscallArg(tc, index);
1021
1022 int sim_fd = process->getSimFD(tgt_fd);
1023 if (sim_fd < 0)
1024 return -EBADF;
1025
1026#if NO_STAT64
1027 struct stat hostBuf;
1028 int result = fstat(sim_fd, &hostBuf);
1029#else
1030 struct stat64 hostBuf;
1031 int result = fstat64(sim_fd, &hostBuf);
1032#endif
1033
1034 if (result < 0)
1035 return -errno;
1036
1037 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1038
1039 return 0;
1040}
1041
1042
1043/// Target lstat() handler.
1044template <class OS>
1045SyscallReturn
1046lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1047 ThreadContext *tc)
1048{
1049 std::string path;
1050
1051 int index = 0;
1052 if (!tc->getMemProxy().tryReadString(path,
1053 process->getSyscallArg(tc, index))) {
1054 return -EFAULT;
1055 }
1056 Addr bufPtr = process->getSyscallArg(tc, index);
1057
1058 // Adjust path for current working directory
1059 path = process->fullPath(path);
1060
1061 struct stat hostBuf;
1062 int result = lstat(path.c_str(), &hostBuf);
1063
1064 if (result < 0)
1065 return -errno;
1066
1067 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1068
1069 return 0;
1070}
1071
1072/// Target lstat64() handler.
1073template <class OS>
1074SyscallReturn
1075lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1076 ThreadContext *tc)
1077{
1078 std::string path;
1079
1080 int index = 0;
1081 if (!tc->getMemProxy().tryReadString(path,
1082 process->getSyscallArg(tc, index))) {
1083 return -EFAULT;
1084 }
1085 Addr bufPtr = process->getSyscallArg(tc, index);
1086
1087 // Adjust path for current working directory
1088 path = process->fullPath(path);
1089
1090#if NO_STAT64
1091 struct stat hostBuf;
1092 int result = lstat(path.c_str(), &hostBuf);
1093#else
1094 struct stat64 hostBuf;
1095 int result = lstat64(path.c_str(), &hostBuf);
1096#endif
1097
1098 if (result < 0)
1099 return -errno;
1100
1101 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1102
1103 return 0;
1104}
1105
1106/// Target fstat() handler.
1107template <class OS>
1108SyscallReturn
1109fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1110 ThreadContext *tc)
1111{
1112 int index = 0;
1113 int tgt_fd = process->getSyscallArg(tc, index);
1114 Addr bufPtr = process->getSyscallArg(tc, index);
1115
1116 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd);
1117
1118 int sim_fd = process->getSimFD(tgt_fd);
1119 if (sim_fd < 0)
1120 return -EBADF;
1121
1122 struct stat hostBuf;
1123 int result = fstat(sim_fd, &hostBuf);
1124
1125 if (result < 0)
1126 return -errno;
1127
1128 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1129
1130 return 0;
1131}
1132
1133
1134/// Target statfs() handler.
1135template <class OS>
1136SyscallReturn
1137statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1138 ThreadContext *tc)
1139{
1140 std::string path;
1141
1142 int index = 0;
1143 if (!tc->getMemProxy().tryReadString(path,
1144 process->getSyscallArg(tc, index))) {
1145 return -EFAULT;
1146 }
1147 Addr bufPtr = process->getSyscallArg(tc, index);
1148
1149 // Adjust path for current working directory
1150 path = process->fullPath(path);
1151
1152 struct statfs hostBuf;
1153 int result = statfs(path.c_str(), &hostBuf);
1154
1155 if (result < 0)
1156 return -errno;
1157
1158 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1159
1160 return 0;
1161}
1162
1163
1164/// Target fstatfs() handler.
1165template <class OS>
1166SyscallReturn
1167fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1168 ThreadContext *tc)
1169{
1170 int index = 0;
1171 int tgt_fd = process->getSyscallArg(tc, index);
1172 Addr bufPtr = process->getSyscallArg(tc, index);
1173
1174 int sim_fd = process->getSimFD(tgt_fd);
1175 if (sim_fd < 0)
1176 return -EBADF;
1177
1178 struct statfs hostBuf;
1179 int result = fstatfs(sim_fd, &hostBuf);
1180
1181 if (result < 0)
1182 return -errno;
1183
1184 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1185
1186 return 0;
1187}
1188
1189
1190/// Target writev() handler.
1191template <class OS>
1192SyscallReturn
1193writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1194 ThreadContext *tc)
1195{
1196 int index = 0;
1197 int tgt_fd = process->getSyscallArg(tc, index);
1198
1199 int sim_fd = process->getSimFD(tgt_fd);
1200 if (sim_fd < 0)
1201 return -EBADF;
1202
1203 SETranslatingPortProxy &p = tc->getMemProxy();
1204 uint64_t tiov_base = process->getSyscallArg(tc, index);
1205 size_t count = process->getSyscallArg(tc, index);
1206 struct iovec hiov[count];
1207 for (size_t i = 0; i < count; ++i) {
1208 typename OS::tgt_iovec tiov;
1209
1210 p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1211 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1212 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1213 hiov[i].iov_base = new char [hiov[i].iov_len];
1214 p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1215 hiov[i].iov_len);
1216 }
1217
1218 int result = writev(sim_fd, hiov, count);
1219
1220 for (size_t i = 0; i < count; ++i)
1221 delete [] (char *)hiov[i].iov_base;
1222
1223 if (result < 0)
1224 return -errno;
1225
1226 return result;
1227}
1228
1229/// Real mmap handler.
1230template <class OS>
1231SyscallReturn
1232mmapImpl(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
1233 bool is_mmap2)
1234{
1235 int index = 0;
1236 Addr start = p->getSyscallArg(tc, index);
1237 uint64_t length = p->getSyscallArg(tc, index);
1238 int prot = p->getSyscallArg(tc, index);
1239 int tgt_flags = p->getSyscallArg(tc, index);
1240 int tgt_fd = p->getSyscallArg(tc, index);
1241 int offset = p->getSyscallArg(tc, index);
1242
1243 if (is_mmap2)
1244 offset *= TheISA::PageBytes;
1245
1246 if (start & (TheISA::PageBytes - 1) ||
1247 offset & (TheISA::PageBytes - 1) ||
1248 (tgt_flags & OS::TGT_MAP_PRIVATE &&
1249 tgt_flags & OS::TGT_MAP_SHARED) ||
1250 (!(tgt_flags & OS::TGT_MAP_PRIVATE) &&
1251 !(tgt_flags & OS::TGT_MAP_SHARED)) ||
1252 !length) {
1253 return -EINVAL;
1254 }
1255
1256 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) {
1257 // With shared mmaps, there are two cases to consider:
1258 // 1) anonymous: writes should modify the mapping and this should be
1259 // visible to observers who share the mapping. Currently, it's
1260 // difficult to update the shared mapping because there's no
1261 // structure which maintains information about the which virtual
1262 // memory areas are shared. If that structure existed, it would be
1263 // possible to make the translations point to the same frames.
1264 // 2) file-backed: writes should modify the mapping and the file
1265 // which is backed by the mapping. The shared mapping problem is the
1266 // same as what was mentioned about the anonymous mappings. For
1267 // file-backed mappings, the writes to the file are difficult
1268 // because it requires syncing what the mapping holds with the file
1269 // that resides on the host system. So, any write on a real system
1270 // would cause the change to be propagated to the file mapping at
1271 // some point in the future (the inode is tracked along with the
1272 // mapping). This isn't guaranteed to always happen, but it usually
1273 // works well enough. The guarantee is provided by the msync system
1274 // call. We could force the change through with shared mappings with
1275 // a call to msync, but that again would require more information
1276 // than we currently maintain.
1277 warn("mmap: writing to shared mmap region is currently "
1278 "unsupported. The write succeeds on the target, but it "
1279 "will not be propagated to the host or shared mappings");
1280 }
1281
1282 length = roundUp(length, TheISA::PageBytes);
1283
1284 int sim_fd = -1;
1285 uint8_t *pmap = nullptr;
1286 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) {
| 1/*
2 * Copyright (c) 2012-2013, 2015 ARM Limited
3 * Copyright (c) 2015 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder. You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2003-2005 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Steve Reinhardt
42 * Kevin Lim
43 */
44
45#ifndef __SIM_SYSCALL_EMUL_HH__
46#define __SIM_SYSCALL_EMUL_HH__
47
48#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
49 defined(__FreeBSD__) || defined(__CYGWIN__) || \
50 defined(__NetBSD__))
51
52///
53/// @file syscall_emul.hh
54///
55/// This file defines objects used to emulate syscalls from the target
56/// application on the host machine.
57
58#ifdef __CYGWIN32__
59#include <sys/fcntl.h> // for O_BINARY
60
61#endif
62#include <fcntl.h>
63#include <sys/mman.h>
64#include <sys/stat.h>
65#include <sys/time.h>
66#include <sys/uio.h>
67#include <unistd.h>
68
69#include <cerrno>
70#include <string>
71
72#include "base/chunk_generator.hh"
73#include "base/intmath.hh" // for RoundUp
74#include "base/loader/object_file.hh"
75#include "base/misc.hh"
76#include "base/trace.hh"
77#include "base/types.hh"
78#include "config/the_isa.hh"
79#include "cpu/base.hh"
80#include "cpu/thread_context.hh"
81#include "debug/SyscallBase.hh"
82#include "debug/SyscallVerbose.hh"
83#include "mem/page_table.hh"
84#include "sim/byteswap.hh"
85#include "sim/emul_driver.hh"
86#include "sim/process.hh"
87#include "sim/syscall_emul_buf.hh"
88#include "sim/syscallreturn.hh"
89#include "sim/system.hh"
90
91// This wrapper macro helps out with readability a bit. FLAGEXT specifies
92// the verbosity and FMT is the message to be appended to the syscall
93// header information. The syscall header information contains the cpuid
94// and thread id.
95#define DPRINTF_SYSCALL(FLAGEXT, FMT, ...) \
96 DPRINTFS(Syscall##FLAGEXT, tc->getCpuPtr(), "T%d : syscall " FMT, \
97 tc->threadId(), __VA_ARGS__)
98
99///
100/// System call descriptor.
101///
102class SyscallDesc {
103
104 public:
105
106 /// Typedef for target syscall handler functions.
107 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
108 LiveProcess *, ThreadContext *);
109
110 const char *name; //!< Syscall name (e.g., "open").
111 FuncPtr funcPtr; //!< Pointer to emulation function.
112 int flags; //!< Flags (see Flags enum).
113 bool warned; //!< Have we warned about unimplemented syscall?
114
115 /// Flag values for controlling syscall behavior.
116 enum Flags {
117 /// Don't set return regs according to funcPtr return value.
118 /// Used for syscalls with non-standard return conventions
119 /// that explicitly set the ThreadContext regs (e.g.,
120 /// sigreturn).
121 SuppressReturnValue = 1,
122 WarnOnce = 2
123 };
124
125 /// Constructor.
126 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
127 : name(_name), funcPtr(_funcPtr), flags(_flags), warned(false)
128 {
129 }
130
131 /// Emulate the syscall. Public interface for calling through funcPtr.
132 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
133
134 /// Is the WarnOnce flag set?
135 bool warnOnce() const { return (flags & WarnOnce); }
136};
137
138
139//////////////////////////////////////////////////////////////////////
140//
141// The following emulation functions are generic enough that they
142// don't need to be recompiled for different emulated OS's. They are
143// defined in sim/syscall_emul.cc.
144//
145//////////////////////////////////////////////////////////////////////
146
147
148/// Handler for unimplemented syscalls that we haven't thought about.
149SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
150 LiveProcess *p, ThreadContext *tc);
151
152/// Handler for unimplemented syscalls that we never intend to
153/// implement (signal handling, etc.) and should not affect the correct
154/// behavior of the program. Print a warning only if the appropriate
155/// trace flag is enabled. Return success to the target program.
156SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
157 LiveProcess *p, ThreadContext *tc);
158
159/// Target exit() handler: terminate current context.
160SyscallReturn exitFunc(SyscallDesc *desc, int num,
161 LiveProcess *p, ThreadContext *tc);
162
163/// Target exit_group() handler: terminate simulation. (exit all threads)
164SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
165 LiveProcess *p, ThreadContext *tc);
166
167/// Target getpagesize() handler.
168SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
169 LiveProcess *p, ThreadContext *tc);
170
171/// Target brk() handler: set brk address.
172SyscallReturn brkFunc(SyscallDesc *desc, int num,
173 LiveProcess *p, ThreadContext *tc);
174
175/// Target close() handler.
176SyscallReturn closeFunc(SyscallDesc *desc, int num,
177 LiveProcess *p, ThreadContext *tc);
178
179/// Target read() handler.
180SyscallReturn readFunc(SyscallDesc *desc, int num,
181 LiveProcess *p, ThreadContext *tc);
182
183/// Target write() handler.
184SyscallReturn writeFunc(SyscallDesc *desc, int num,
185 LiveProcess *p, ThreadContext *tc);
186
187/// Target lseek() handler.
188SyscallReturn lseekFunc(SyscallDesc *desc, int num,
189 LiveProcess *p, ThreadContext *tc);
190
191/// Target _llseek() handler.
192SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
193 LiveProcess *p, ThreadContext *tc);
194
195/// Target munmap() handler.
196SyscallReturn munmapFunc(SyscallDesc *desc, int num,
197 LiveProcess *p, ThreadContext *tc);
198
199/// Target gethostname() handler.
200SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
201 LiveProcess *p, ThreadContext *tc);
202
203/// Target getcwd() handler.
204SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
205 LiveProcess *p, ThreadContext *tc);
206
207/// Target readlink() handler.
208SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
209 LiveProcess *p, ThreadContext *tc,
210 int index = 0);
211SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
212 LiveProcess *p, ThreadContext *tc);
213
214/// Target unlink() handler.
215SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
216 LiveProcess *p, ThreadContext *tc,
217 int index);
218SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
219 LiveProcess *p, ThreadContext *tc);
220
221/// Target mkdir() handler.
222SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
223 LiveProcess *p, ThreadContext *tc);
224
225/// Target rename() handler.
226SyscallReturn renameFunc(SyscallDesc *desc, int num,
227 LiveProcess *p, ThreadContext *tc);
228
229
230/// Target truncate() handler.
231SyscallReturn truncateFunc(SyscallDesc *desc, int num,
232 LiveProcess *p, ThreadContext *tc);
233
234
235/// Target ftruncate() handler.
236SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
237 LiveProcess *p, ThreadContext *tc);
238
239
240/// Target truncate64() handler.
241SyscallReturn truncate64Func(SyscallDesc *desc, int num,
242 LiveProcess *p, ThreadContext *tc);
243
244/// Target ftruncate64() handler.
245SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
246 LiveProcess *p, ThreadContext *tc);
247
248
249/// Target umask() handler.
250SyscallReturn umaskFunc(SyscallDesc *desc, int num,
251 LiveProcess *p, ThreadContext *tc);
252
253
254/// Target chown() handler.
255SyscallReturn chownFunc(SyscallDesc *desc, int num,
256 LiveProcess *p, ThreadContext *tc);
257
258
259/// Target fchown() handler.
260SyscallReturn fchownFunc(SyscallDesc *desc, int num,
261 LiveProcess *p, ThreadContext *tc);
262
263/// Target dup() handler.
264SyscallReturn dupFunc(SyscallDesc *desc, int num,
265 LiveProcess *process, ThreadContext *tc);
266
267/// Target fnctl() handler.
268SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
269 LiveProcess *process, ThreadContext *tc);
270
271/// Target fcntl64() handler.
272SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
273 LiveProcess *process, ThreadContext *tc);
274
275/// Target setuid() handler.
276SyscallReturn setuidFunc(SyscallDesc *desc, int num,
277 LiveProcess *p, ThreadContext *tc);
278
279/// Target getpid() handler.
280SyscallReturn getpidFunc(SyscallDesc *desc, int num,
281 LiveProcess *p, ThreadContext *tc);
282
283/// Target getuid() handler.
284SyscallReturn getuidFunc(SyscallDesc *desc, int num,
285 LiveProcess *p, ThreadContext *tc);
286
287/// Target getgid() handler.
288SyscallReturn getgidFunc(SyscallDesc *desc, int num,
289 LiveProcess *p, ThreadContext *tc);
290
291/// Target getppid() handler.
292SyscallReturn getppidFunc(SyscallDesc *desc, int num,
293 LiveProcess *p, ThreadContext *tc);
294
295/// Target geteuid() handler.
296SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
297 LiveProcess *p, ThreadContext *tc);
298
299/// Target getegid() handler.
300SyscallReturn getegidFunc(SyscallDesc *desc, int num,
301 LiveProcess *p, ThreadContext *tc);
302
303/// Target clone() handler.
304SyscallReturn cloneFunc(SyscallDesc *desc, int num,
305 LiveProcess *p, ThreadContext *tc);
306
307/// Target access() handler
308SyscallReturn accessFunc(SyscallDesc *desc, int num,
309 LiveProcess *p, ThreadContext *tc);
310SyscallReturn accessFunc(SyscallDesc *desc, int num,
311 LiveProcess *p, ThreadContext *tc,
312 int index);
313
314/// Futex system call
315/// Implemented by Daniel Sanchez
316/// Used by printf's in multi-threaded apps
317template <class OS>
318SyscallReturn
319futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
320 ThreadContext *tc)
321{
322 int index_uaddr = 0;
323 int index_op = 1;
324 int index_val = 2;
325 int index_timeout = 3;
326
327 uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
328 int op = process->getSyscallArg(tc, index_op);
329 int val = process->getSyscallArg(tc, index_val);
330 uint64_t timeout = process->getSyscallArg(tc, index_timeout);
331
332 std::map<uint64_t, std::list<ThreadContext *> * >
333 &futex_map = tc->getSystemPtr()->futexMap;
334
335 DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
336 uaddr, op, val);
337
338 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
339
340 if (op == OS::TGT_FUTEX_WAIT) {
341 if (timeout != 0) {
342 warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
343 "we'll wait indefinitely");
344 }
345
346 uint8_t *buf = new uint8_t[sizeof(int)];
347 tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
348 int mem_val = *((int *)buf);
349 delete[] buf;
350
351 if (val != mem_val) {
352 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
353 "expected: %d\n", mem_val, val);
354 return -OS::TGT_EWOULDBLOCK;
355 }
356
357 // Queue the thread context
358 std::list<ThreadContext *> * tcWaitList;
359 if (futex_map.count(uaddr)) {
360 tcWaitList = futex_map.find(uaddr)->second;
361 } else {
362 tcWaitList = new std::list<ThreadContext *>();
363 futex_map.insert(std::pair< uint64_t,
364 std::list<ThreadContext *> * >(uaddr, tcWaitList));
365 }
366 tcWaitList->push_back(tc);
367 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
368 "thread context\n");
369 tc->suspend();
370 return 0;
371 } else if (op == OS::TGT_FUTEX_WAKE){
372 int wokenUp = 0;
373 std::list<ThreadContext *> * tcWaitList;
374 if (futex_map.count(uaddr)) {
375 tcWaitList = futex_map.find(uaddr)->second;
376 while (tcWaitList->size() > 0 && wokenUp < val) {
377 tcWaitList->front()->activate();
378 tcWaitList->pop_front();
379 wokenUp++;
380 }
381 if (tcWaitList->empty()) {
382 futex_map.erase(uaddr);
383 delete tcWaitList;
384 }
385 }
386 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
387 "thread contexts\n", wokenUp);
388 return wokenUp;
389 } else {
390 warn("sys_futex: op %d is not implemented, just returning...", op);
391 return 0;
392 }
393
394}
395
396
397/// Pseudo Funcs - These functions use a different return convension,
398/// returning a second value in a register other than the normal return register
399SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
400 LiveProcess *process, ThreadContext *tc);
401
402/// Target getpidPseudo() handler.
403SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
404 LiveProcess *p, ThreadContext *tc);
405
406/// Target getuidPseudo() handler.
407SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
408 LiveProcess *p, ThreadContext *tc);
409
410/// Target getgidPseudo() handler.
411SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
412 LiveProcess *p, ThreadContext *tc);
413
414
415/// A readable name for 1,000,000, for converting microseconds to seconds.
416const int one_million = 1000000;
417/// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
418const int one_billion = 1000000000;
419
420/// Approximate seconds since the epoch (1/1/1970). About a billion,
421/// by my reckoning. We want to keep this a constant (not use the
422/// real-world time) to keep simulations repeatable.
423const unsigned seconds_since_epoch = 1000000000;
424
425/// Helper function to convert current elapsed time to seconds and
426/// microseconds.
427template <class T1, class T2>
428void
429getElapsedTimeMicro(T1 &sec, T2 &usec)
430{
431 uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
432 sec = elapsed_usecs / one_million;
433 usec = elapsed_usecs % one_million;
434}
435
436/// Helper function to convert current elapsed time to seconds and
437/// nanoseconds.
438template <class T1, class T2>
439void
440getElapsedTimeNano(T1 &sec, T2 &nsec)
441{
442 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
443 sec = elapsed_nsecs / one_billion;
444 nsec = elapsed_nsecs % one_billion;
445}
446
447//////////////////////////////////////////////////////////////////////
448//
449// The following emulation functions are generic, but need to be
450// templated to account for differences in types, constants, etc.
451//
452//////////////////////////////////////////////////////////////////////
453
454#if NO_STAT64
455 typedef struct stat hst_stat;
456 typedef struct stat hst_stat64;
457#else
458 typedef struct stat hst_stat;
459 typedef struct stat64 hst_stat64;
460#endif
461
462//// Helper function to convert a host stat buffer to a target stat
463//// buffer. Also copies the target buffer out to the simulated
464//// memory space. Used by stat(), fstat(), and lstat().
465
466template <typename target_stat, typename host_stat>
467static void
468convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
469{
470 using namespace TheISA;
471
472 if (fakeTTY)
473 tgt->st_dev = 0xA;
474 else
475 tgt->st_dev = host->st_dev;
476 tgt->st_dev = TheISA::htog(tgt->st_dev);
477 tgt->st_ino = host->st_ino;
478 tgt->st_ino = TheISA::htog(tgt->st_ino);
479 tgt->st_mode = host->st_mode;
480 if (fakeTTY) {
481 // Claim to be a character device
482 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
483 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
484 }
485 tgt->st_mode = TheISA::htog(tgt->st_mode);
486 tgt->st_nlink = host->st_nlink;
487 tgt->st_nlink = TheISA::htog(tgt->st_nlink);
488 tgt->st_uid = host->st_uid;
489 tgt->st_uid = TheISA::htog(tgt->st_uid);
490 tgt->st_gid = host->st_gid;
491 tgt->st_gid = TheISA::htog(tgt->st_gid);
492 if (fakeTTY)
493 tgt->st_rdev = 0x880d;
494 else
495 tgt->st_rdev = host->st_rdev;
496 tgt->st_rdev = TheISA::htog(tgt->st_rdev);
497 tgt->st_size = host->st_size;
498 tgt->st_size = TheISA::htog(tgt->st_size);
499 tgt->st_atimeX = host->st_atime;
500 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
501 tgt->st_mtimeX = host->st_mtime;
502 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
503 tgt->st_ctimeX = host->st_ctime;
504 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
505 // Force the block size to be 8k. This helps to ensure buffered io works
506 // consistently across different hosts.
507 tgt->st_blksize = 0x2000;
508 tgt->st_blksize = TheISA::htog(tgt->st_blksize);
509 tgt->st_blocks = host->st_blocks;
510 tgt->st_blocks = TheISA::htog(tgt->st_blocks);
511}
512
513// Same for stat64
514
515template <typename target_stat, typename host_stat64>
516static void
517convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
518{
519 using namespace TheISA;
520
521 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
522#if defined(STAT_HAVE_NSEC)
523 tgt->st_atime_nsec = host->st_atime_nsec;
524 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
525 tgt->st_mtime_nsec = host->st_mtime_nsec;
526 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
527 tgt->st_ctime_nsec = host->st_ctime_nsec;
528 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
529#else
530 tgt->st_atime_nsec = 0;
531 tgt->st_mtime_nsec = 0;
532 tgt->st_ctime_nsec = 0;
533#endif
534}
535
536//Here are a couple convenience functions
537template<class OS>
538static void
539copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
540 hst_stat *host, bool fakeTTY = false)
541{
542 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
543 tgt_stat_buf tgt(addr);
544 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
545 tgt.copyOut(mem);
546}
547
548template<class OS>
549static void
550copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
551 hst_stat64 *host, bool fakeTTY = false)
552{
553 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
554 tgt_stat_buf tgt(addr);
555 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
556 tgt.copyOut(mem);
557}
558
559/// Target ioctl() handler. For the most part, programs call ioctl()
560/// only to find out if their stdout is a tty, to determine whether to
561/// do line or block buffering. We always claim that output fds are
562/// not TTYs to provide repeatable results.
563template <class OS>
564SyscallReturn
565ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
566 ThreadContext *tc)
567{
568 int index = 0;
569 int tgt_fd = process->getSyscallArg(tc, index);
570 unsigned req = process->getSyscallArg(tc, index);
571
572 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req);
573
574 FDEntry *fde = process->getFDEntry(tgt_fd);
575
576 if (fde == NULL) {
577 // doesn't map to any simulator fd: not a valid target fd
578 return -EBADF;
579 }
580
581 if (fde->driver != NULL) {
582 return fde->driver->ioctl(process, tc, req);
583 }
584
585 if (OS::isTtyReq(req)) {
586 return -ENOTTY;
587 }
588
589 warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
590 tgt_fd, req, tc->pcState());
591 return -ENOTTY;
592}
593
594template <class OS>
595static SyscallReturn
596openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
597 ThreadContext *tc, int index)
598{
599 std::string path;
600
601 if (!tc->getMemProxy().tryReadString(path,
602 process->getSyscallArg(tc, index)))
603 return -EFAULT;
604
605 int tgtFlags = process->getSyscallArg(tc, index);
606 int mode = process->getSyscallArg(tc, index);
607 int hostFlags = 0;
608
609 // translate open flags
610 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
611 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
612 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
613 hostFlags |= OS::openFlagTable[i].hostFlag;
614 }
615 }
616
617 // any target flags left?
618 if (tgtFlags != 0)
619 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
620
621#ifdef __CYGWIN32__
622 hostFlags |= O_BINARY;
623#endif
624
625 // Adjust path for current working directory
626 path = process->fullPath(path);
627
628 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
629
630 if (startswith(path, "/dev/")) {
631 std::string filename = path.substr(strlen("/dev/"));
632 if (filename == "sysdev0") {
633 // This is a memory-mapped high-resolution timer device on Alpha.
634 // We don't support it, so just punt.
635 warn("Ignoring open(%s, ...)\n", path);
636 return -ENOENT;
637 }
638
639 EmulatedDriver *drv = process->findDriver(filename);
640 if (drv != NULL) {
641 // the driver's open method will allocate a fd from the
642 // process if necessary.
643 return drv->open(process, tc, mode, hostFlags);
644 }
645
646 // fall through here for pass through to host devices, such as
647 // /dev/zero
648 }
649
650 int fd;
651 int local_errno;
652 if (startswith(path, "/proc/") || startswith(path, "/system/") ||
653 startswith(path, "/platform/") || startswith(path, "/sys/")) {
654 // It's a proc/sys entry and requires special handling
655 fd = OS::openSpecialFile(path, process, tc);
656 local_errno = ENOENT;
657 } else {
658 // open the file
659 fd = open(path.c_str(), hostFlags, mode);
660 local_errno = errno;
661 }
662
663 if (fd == -1)
664 return -local_errno;
665
666 return process->allocFD(fd, path.c_str(), hostFlags, mode, false);
667}
668
669/// Target open() handler.
670template <class OS>
671SyscallReturn
672openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
673 ThreadContext *tc)
674{
675 return openFunc<OS>(desc, callnum, process, tc, 0);
676}
677
678/// Target openat() handler.
679template <class OS>
680SyscallReturn
681openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
682 ThreadContext *tc)
683{
684 int index = 0;
685 int dirfd = process->getSyscallArg(tc, index);
686 if (dirfd != OS::TGT_AT_FDCWD)
687 warn("openat: first argument not AT_FDCWD; unlikely to work");
688 return openFunc<OS>(desc, callnum, process, tc, 1);
689}
690
691/// Target unlinkat() handler.
692template <class OS>
693SyscallReturn
694unlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
695 ThreadContext *tc)
696{
697 int index = 0;
698 int dirfd = process->getSyscallArg(tc, index);
699 if (dirfd != OS::TGT_AT_FDCWD)
700 warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
701
702 return unlinkHelper(desc, callnum, process, tc, 1);
703}
704
705/// Target facessat() handler
706template <class OS>
707SyscallReturn
708faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
709 ThreadContext *tc)
710{
711 int index = 0;
712 int dirfd = process->getSyscallArg(tc, index);
713 if (dirfd != OS::TGT_AT_FDCWD)
714 warn("faccessat: first argument not AT_FDCWD; unlikely to work");
715 return accessFunc(desc, callnum, process, tc, 1);
716}
717
718/// Target readlinkat() handler
719template <class OS>
720SyscallReturn
721readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
722 ThreadContext *tc)
723{
724 int index = 0;
725 int dirfd = process->getSyscallArg(tc, index);
726 if (dirfd != OS::TGT_AT_FDCWD)
727 warn("openat: first argument not AT_FDCWD; unlikely to work");
728 return readlinkFunc(desc, callnum, process, tc, 1);
729}
730
731/// Target renameat() handler.
732template <class OS>
733SyscallReturn
734renameatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
735 ThreadContext *tc)
736{
737 int index = 0;
738
739 int olddirfd = process->getSyscallArg(tc, index);
740 if (olddirfd != OS::TGT_AT_FDCWD)
741 warn("renameat: first argument not AT_FDCWD; unlikely to work");
742
743 std::string old_name;
744
745 if (!tc->getMemProxy().tryReadString(old_name,
746 process->getSyscallArg(tc, index)))
747 return -EFAULT;
748
749 int newdirfd = process->getSyscallArg(tc, index);
750 if (newdirfd != OS::TGT_AT_FDCWD)
751 warn("renameat: third argument not AT_FDCWD; unlikely to work");
752
753 std::string new_name;
754
755 if (!tc->getMemProxy().tryReadString(new_name,
756 process->getSyscallArg(tc, index)))
757 return -EFAULT;
758
759 // Adjust path for current working directory
760 old_name = process->fullPath(old_name);
761 new_name = process->fullPath(new_name);
762
763 int result = rename(old_name.c_str(), new_name.c_str());
764 return (result == -1) ? -errno : result;
765}
766
767/// Target sysinfo() handler.
768template <class OS>
769SyscallReturn
770sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
771 ThreadContext *tc)
772{
773
774 int index = 0;
775 TypedBufferArg<typename OS::tgt_sysinfo>
776 sysinfo(process->getSyscallArg(tc, index));
777
778 sysinfo->uptime=seconds_since_epoch;
779 sysinfo->totalram=process->system->memSize();
780
781 sysinfo.copyOut(tc->getMemProxy());
782
783 return 0;
784}
785
786/// Target chmod() handler.
787template <class OS>
788SyscallReturn
789chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
790 ThreadContext *tc)
791{
792 std::string path;
793
794 int index = 0;
795 if (!tc->getMemProxy().tryReadString(path,
796 process->getSyscallArg(tc, index))) {
797 return -EFAULT;
798 }
799
800 uint32_t mode = process->getSyscallArg(tc, index);
801 mode_t hostMode = 0;
802
803 // XXX translate mode flags via OS::something???
804 hostMode = mode;
805
806 // Adjust path for current working directory
807 path = process->fullPath(path);
808
809 // do the chmod
810 int result = chmod(path.c_str(), hostMode);
811 if (result < 0)
812 return -errno;
813
814 return 0;
815}
816
817
818/// Target fchmod() handler.
819template <class OS>
820SyscallReturn
821fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
822 ThreadContext *tc)
823{
824 int index = 0;
825 int tgt_fd = process->getSyscallArg(tc, index);
826 uint32_t mode = process->getSyscallArg(tc, index);
827
828 int sim_fd = process->getSimFD(tgt_fd);
829 if (sim_fd < 0)
830 return -EBADF;
831
832 mode_t hostMode = 0;
833
834 // XXX translate mode flags via OS::someting???
835 hostMode = mode;
836
837 // do the fchmod
838 int result = fchmod(sim_fd, hostMode);
839 if (result < 0)
840 return -errno;
841
842 return 0;
843}
844
845/// Target mremap() handler.
846template <class OS>
847SyscallReturn
848mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
849{
850 int index = 0;
851 Addr start = process->getSyscallArg(tc, index);
852 uint64_t old_length = process->getSyscallArg(tc, index);
853 uint64_t new_length = process->getSyscallArg(tc, index);
854 uint64_t flags = process->getSyscallArg(tc, index);
855 uint64_t provided_address = 0;
856 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
857
858 if (use_provided_address)
859 provided_address = process->getSyscallArg(tc, index);
860
861 if ((start % TheISA::PageBytes != 0) ||
862 (provided_address % TheISA::PageBytes != 0)) {
863 warn("mremap failing: arguments not page aligned");
864 return -EINVAL;
865 }
866
867 new_length = roundUp(new_length, TheISA::PageBytes);
868
869 if (new_length > old_length) {
870 if ((start + old_length) == process->mmap_end &&
871 (!use_provided_address || provided_address == start)) {
872 uint64_t diff = new_length - old_length;
873 process->allocateMem(process->mmap_end, diff);
874 process->mmap_end += diff;
875 return start;
876 } else {
877 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
878 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
879 return -ENOMEM;
880 } else {
881 uint64_t new_start = use_provided_address ?
882 provided_address : process->mmap_end;
883 process->pTable->remap(start, old_length, new_start);
884 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
885 new_start, new_start + new_length,
886 new_length - old_length);
887 // add on the remaining unallocated pages
888 process->allocateMem(new_start + old_length,
889 new_length - old_length,
890 use_provided_address /* clobber */);
891 if (!use_provided_address)
892 process->mmap_end += new_length;
893 if (use_provided_address &&
894 new_start + new_length > process->mmap_end) {
895 // something fishy going on here, at least notify the user
896 // @todo: increase mmap_end?
897 warn("mmap region limit exceeded with MREMAP_FIXED\n");
898 }
899 warn("returning %08p as start\n", new_start);
900 return new_start;
901 }
902 }
903 } else {
904 if (use_provided_address && provided_address != start)
905 process->pTable->remap(start, new_length, provided_address);
906 process->pTable->unmap(start + new_length, old_length - new_length);
907 return use_provided_address ? provided_address : start;
908 }
909}
910
911/// Target stat() handler.
912template <class OS>
913SyscallReturn
914statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
915 ThreadContext *tc)
916{
917 std::string path;
918
919 int index = 0;
920 if (!tc->getMemProxy().tryReadString(path,
921 process->getSyscallArg(tc, index))) {
922 return -EFAULT;
923 }
924 Addr bufPtr = process->getSyscallArg(tc, index);
925
926 // Adjust path for current working directory
927 path = process->fullPath(path);
928
929 struct stat hostBuf;
930 int result = stat(path.c_str(), &hostBuf);
931
932 if (result < 0)
933 return -errno;
934
935 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
936
937 return 0;
938}
939
940
941/// Target stat64() handler.
942template <class OS>
943SyscallReturn
944stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
945 ThreadContext *tc)
946{
947 std::string path;
948
949 int index = 0;
950 if (!tc->getMemProxy().tryReadString(path,
951 process->getSyscallArg(tc, index)))
952 return -EFAULT;
953 Addr bufPtr = process->getSyscallArg(tc, index);
954
955 // Adjust path for current working directory
956 path = process->fullPath(path);
957
958#if NO_STAT64
959 struct stat hostBuf;
960 int result = stat(path.c_str(), &hostBuf);
961#else
962 struct stat64 hostBuf;
963 int result = stat64(path.c_str(), &hostBuf);
964#endif
965
966 if (result < 0)
967 return -errno;
968
969 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
970
971 return 0;
972}
973
974
975/// Target fstatat64() handler.
976template <class OS>
977SyscallReturn
978fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
979 ThreadContext *tc)
980{
981 int index = 0;
982 int dirfd = process->getSyscallArg(tc, index);
983 if (dirfd != OS::TGT_AT_FDCWD)
984 warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
985
986 std::string path;
987 if (!tc->getMemProxy().tryReadString(path,
988 process->getSyscallArg(tc, index)))
989 return -EFAULT;
990 Addr bufPtr = process->getSyscallArg(tc, index);
991
992 // Adjust path for current working directory
993 path = process->fullPath(path);
994
995#if NO_STAT64
996 struct stat hostBuf;
997 int result = stat(path.c_str(), &hostBuf);
998#else
999 struct stat64 hostBuf;
1000 int result = stat64(path.c_str(), &hostBuf);
1001#endif
1002
1003 if (result < 0)
1004 return -errno;
1005
1006 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1007
1008 return 0;
1009}
1010
1011
1012/// Target fstat64() handler.
1013template <class OS>
1014SyscallReturn
1015fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1016 ThreadContext *tc)
1017{
1018 int index = 0;
1019 int tgt_fd = process->getSyscallArg(tc, index);
1020 Addr bufPtr = process->getSyscallArg(tc, index);
1021
1022 int sim_fd = process->getSimFD(tgt_fd);
1023 if (sim_fd < 0)
1024 return -EBADF;
1025
1026#if NO_STAT64
1027 struct stat hostBuf;
1028 int result = fstat(sim_fd, &hostBuf);
1029#else
1030 struct stat64 hostBuf;
1031 int result = fstat64(sim_fd, &hostBuf);
1032#endif
1033
1034 if (result < 0)
1035 return -errno;
1036
1037 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1038
1039 return 0;
1040}
1041
1042
1043/// Target lstat() handler.
1044template <class OS>
1045SyscallReturn
1046lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1047 ThreadContext *tc)
1048{
1049 std::string path;
1050
1051 int index = 0;
1052 if (!tc->getMemProxy().tryReadString(path,
1053 process->getSyscallArg(tc, index))) {
1054 return -EFAULT;
1055 }
1056 Addr bufPtr = process->getSyscallArg(tc, index);
1057
1058 // Adjust path for current working directory
1059 path = process->fullPath(path);
1060
1061 struct stat hostBuf;
1062 int result = lstat(path.c_str(), &hostBuf);
1063
1064 if (result < 0)
1065 return -errno;
1066
1067 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1068
1069 return 0;
1070}
1071
1072/// Target lstat64() handler.
1073template <class OS>
1074SyscallReturn
1075lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1076 ThreadContext *tc)
1077{
1078 std::string path;
1079
1080 int index = 0;
1081 if (!tc->getMemProxy().tryReadString(path,
1082 process->getSyscallArg(tc, index))) {
1083 return -EFAULT;
1084 }
1085 Addr bufPtr = process->getSyscallArg(tc, index);
1086
1087 // Adjust path for current working directory
1088 path = process->fullPath(path);
1089
1090#if NO_STAT64
1091 struct stat hostBuf;
1092 int result = lstat(path.c_str(), &hostBuf);
1093#else
1094 struct stat64 hostBuf;
1095 int result = lstat64(path.c_str(), &hostBuf);
1096#endif
1097
1098 if (result < 0)
1099 return -errno;
1100
1101 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1102
1103 return 0;
1104}
1105
1106/// Target fstat() handler.
1107template <class OS>
1108SyscallReturn
1109fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1110 ThreadContext *tc)
1111{
1112 int index = 0;
1113 int tgt_fd = process->getSyscallArg(tc, index);
1114 Addr bufPtr = process->getSyscallArg(tc, index);
1115
1116 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd);
1117
1118 int sim_fd = process->getSimFD(tgt_fd);
1119 if (sim_fd < 0)
1120 return -EBADF;
1121
1122 struct stat hostBuf;
1123 int result = fstat(sim_fd, &hostBuf);
1124
1125 if (result < 0)
1126 return -errno;
1127
1128 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1129
1130 return 0;
1131}
1132
1133
1134/// Target statfs() handler.
1135template <class OS>
1136SyscallReturn
1137statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1138 ThreadContext *tc)
1139{
1140 std::string path;
1141
1142 int index = 0;
1143 if (!tc->getMemProxy().tryReadString(path,
1144 process->getSyscallArg(tc, index))) {
1145 return -EFAULT;
1146 }
1147 Addr bufPtr = process->getSyscallArg(tc, index);
1148
1149 // Adjust path for current working directory
1150 path = process->fullPath(path);
1151
1152 struct statfs hostBuf;
1153 int result = statfs(path.c_str(), &hostBuf);
1154
1155 if (result < 0)
1156 return -errno;
1157
1158 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1159
1160 return 0;
1161}
1162
1163
1164/// Target fstatfs() handler.
1165template <class OS>
1166SyscallReturn
1167fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1168 ThreadContext *tc)
1169{
1170 int index = 0;
1171 int tgt_fd = process->getSyscallArg(tc, index);
1172 Addr bufPtr = process->getSyscallArg(tc, index);
1173
1174 int sim_fd = process->getSimFD(tgt_fd);
1175 if (sim_fd < 0)
1176 return -EBADF;
1177
1178 struct statfs hostBuf;
1179 int result = fstatfs(sim_fd, &hostBuf);
1180
1181 if (result < 0)
1182 return -errno;
1183
1184 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1185
1186 return 0;
1187}
1188
1189
1190/// Target writev() handler.
1191template <class OS>
1192SyscallReturn
1193writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1194 ThreadContext *tc)
1195{
1196 int index = 0;
1197 int tgt_fd = process->getSyscallArg(tc, index);
1198
1199 int sim_fd = process->getSimFD(tgt_fd);
1200 if (sim_fd < 0)
1201 return -EBADF;
1202
1203 SETranslatingPortProxy &p = tc->getMemProxy();
1204 uint64_t tiov_base = process->getSyscallArg(tc, index);
1205 size_t count = process->getSyscallArg(tc, index);
1206 struct iovec hiov[count];
1207 for (size_t i = 0; i < count; ++i) {
1208 typename OS::tgt_iovec tiov;
1209
1210 p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1211 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1212 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1213 hiov[i].iov_base = new char [hiov[i].iov_len];
1214 p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1215 hiov[i].iov_len);
1216 }
1217
1218 int result = writev(sim_fd, hiov, count);
1219
1220 for (size_t i = 0; i < count; ++i)
1221 delete [] (char *)hiov[i].iov_base;
1222
1223 if (result < 0)
1224 return -errno;
1225
1226 return result;
1227}
1228
1229/// Real mmap handler.
1230template <class OS>
1231SyscallReturn
1232mmapImpl(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
1233 bool is_mmap2)
1234{
1235 int index = 0;
1236 Addr start = p->getSyscallArg(tc, index);
1237 uint64_t length = p->getSyscallArg(tc, index);
1238 int prot = p->getSyscallArg(tc, index);
1239 int tgt_flags = p->getSyscallArg(tc, index);
1240 int tgt_fd = p->getSyscallArg(tc, index);
1241 int offset = p->getSyscallArg(tc, index);
1242
1243 if (is_mmap2)
1244 offset *= TheISA::PageBytes;
1245
1246 if (start & (TheISA::PageBytes - 1) ||
1247 offset & (TheISA::PageBytes - 1) ||
1248 (tgt_flags & OS::TGT_MAP_PRIVATE &&
1249 tgt_flags & OS::TGT_MAP_SHARED) ||
1250 (!(tgt_flags & OS::TGT_MAP_PRIVATE) &&
1251 !(tgt_flags & OS::TGT_MAP_SHARED)) ||
1252 !length) {
1253 return -EINVAL;
1254 }
1255
1256 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) {
1257 // With shared mmaps, there are two cases to consider:
1258 // 1) anonymous: writes should modify the mapping and this should be
1259 // visible to observers who share the mapping. Currently, it's
1260 // difficult to update the shared mapping because there's no
1261 // structure which maintains information about the which virtual
1262 // memory areas are shared. If that structure existed, it would be
1263 // possible to make the translations point to the same frames.
1264 // 2) file-backed: writes should modify the mapping and the file
1265 // which is backed by the mapping. The shared mapping problem is the
1266 // same as what was mentioned about the anonymous mappings. For
1267 // file-backed mappings, the writes to the file are difficult
1268 // because it requires syncing what the mapping holds with the file
1269 // that resides on the host system. So, any write on a real system
1270 // would cause the change to be propagated to the file mapping at
1271 // some point in the future (the inode is tracked along with the
1272 // mapping). This isn't guaranteed to always happen, but it usually
1273 // works well enough. The guarantee is provided by the msync system
1274 // call. We could force the change through with shared mappings with
1275 // a call to msync, but that again would require more information
1276 // than we currently maintain.
1277 warn("mmap: writing to shared mmap region is currently "
1278 "unsupported. The write succeeds on the target, but it "
1279 "will not be propagated to the host or shared mappings");
1280 }
1281
1282 length = roundUp(length, TheISA::PageBytes);
1283
1284 int sim_fd = -1;
1285 uint8_t *pmap = nullptr;
1286 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) {
|
1288 if (sim_fd < 0)
1289 return -EBADF;
1290
1291 pmap = (decltype(pmap))mmap(NULL, length, PROT_READ, MAP_PRIVATE,
1292 sim_fd, offset);
1293
1294 if (pmap == (decltype(pmap))-1) {
1295 warn("mmap: failed to map file into host address space");
1296 return -errno;
1297 }
1298 }
1299
1300 // Extend global mmap region if necessary. Note that we ignore the
1301 // start address unless MAP_FIXED is specified.
1302 if (!(tgt_flags & OS::TGT_MAP_FIXED)) {
1303 start = p->mmapGrowsDown() ? p->mmap_end - length : p->mmap_end;
1304 p->mmap_end = p->mmapGrowsDown() ? start : p->mmap_end + length;
1305 }
1306
1307 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n",
1308 start, start + length - 1);
1309
1310 // We only allow mappings to overwrite existing mappings if
1311 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem
1312 // because we ignore the start hint if TGT_MAP_FIXED is not set.
1313 int clobber = tgt_flags & OS::TGT_MAP_FIXED;
1314 if (clobber) {
1315 for (auto tc : p->system->threadContexts) {
1316 // If we might be overwriting old mappings, we need to
1317 // invalidate potentially stale mappings out of the TLBs.
1318 tc->getDTBPtr()->flushAll();
1319 tc->getITBPtr()->flushAll();
1320 }
1321 }
1322
1323 // Allocate physical memory and map it in. If the page table is already
1324 // mapped and clobber is not set, the simulator will issue throw a
1325 // fatal and bail out of the simulation.
1326 p->allocateMem(start, length, clobber);
1327
1328 // Transfer content into target address space.
1329 SETranslatingPortProxy &tp = tc->getMemProxy();
1330 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) {
1331 // In general, we should zero the mapped area for anonymous mappings,
1332 // with something like:
1333 // tp.memsetBlob(start, 0, length);
1334 // However, given that we don't support sparse mappings, and
1335 // some applications can map a couple of gigabytes of space
1336 // (intending sparse usage), that can get painfully expensive.
1337 // Fortunately, since we don't properly implement munmap either,
1338 // there's no danger of remapping used memory, so for now all
1339 // newly mapped memory should already be zeroed so we can skip it.
1340 } else {
1341 // It is possible to mmap an area larger than a file, however
1342 // accessing unmapped portions the system triggers a "Bus error"
1343 // on the host. We must know when to stop copying the file from
1344 // the host into the target address space.
1345 struct stat file_stat;
1346 if (fstat(sim_fd, &file_stat) > 0)
1347 fatal("mmap: cannot stat file");
1348
1349 // Copy the portion of the file that is resident. This requires
1350 // checking both the mmap size and the filesize that we are
1351 // trying to mmap into this space; the mmap size also depends
1352 // on the specified offset into the file.
1353 uint64_t size = std::min((uint64_t)file_stat.st_size - offset,
1354 length);
1355 tp.writeBlob(start, pmap, size);
1356
1357 // Cleanup the mmap region before exiting this function.
1358 munmap(pmap, length);
1359
1360 // Maintain the symbol table for dynamic executables.
1361 // The loader will call mmap to map the images into its address
1362 // space and we intercept that here. We can verify that we are
1363 // executing inside the loader by checking the program counter value.
1364 // XXX: with multiprogrammed workloads or multi-node configurations,
1365 // this will not work since there is a single global symbol table.
1366 ObjectFile *interpreter = p->getInterpreter();
1367 if (interpreter) {
1368 Addr text_start = interpreter->textBase();
1369 Addr text_end = text_start + interpreter->textSize();
1370
1371 Addr pc = tc->pcState().pc();
1372
1373 if (pc >= text_start && pc < text_end) {
1374 FDEntry *fde = p->getFDEntry(tgt_fd);
1375
1376 ObjectFile *lib = createObjectFile(fde->filename);
1377
1378 if (lib) {
1379 lib->loadAllSymbols(debugSymbolTable,
1380 lib->textBase(), start);
1381 }
1382 }
1383 }
1384
1385 // Note that we do not zero out the remainder of the mapping. This
1386 // is done by a real system, but it probably will not affect
1387 // execution (hopefully).
1388 }
1389
1390 return start;
1391}
1392
1393template <class OS>
1394SyscallReturn
1395pwrite64Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1396{
1397 int index = 0;
1398 int tgt_fd = p->getSyscallArg(tc, index);
1399 Addr bufPtr = p->getSyscallArg(tc, index);
1400 int nbytes = p->getSyscallArg(tc, index);
1401 int offset = p->getSyscallArg(tc, index);
1402
1403 int sim_fd = p->getSimFD(tgt_fd);
1404 if (sim_fd < 0)
1405 return -EBADF;
1406
1407 BufferArg bufArg(bufPtr, nbytes);
1408 bufArg.copyIn(tc->getMemProxy());
1409
1410 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset);
1411
1412 return (bytes_written == -1) ? -errno : bytes_written;
1413}
1414
1415/// Target mmap() handler.
1416template <class OS>
1417SyscallReturn
1418mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1419{
1420 return mmapImpl<OS>(desc, num, p, tc, false);
1421}
1422
1423/// Target mmap2() handler.
1424template <class OS>
1425SyscallReturn
1426mmap2Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1427{
1428 return mmapImpl<OS>(desc, num, p, tc, true);
1429}
1430
1431/// Target getrlimit() handler.
1432template <class OS>
1433SyscallReturn
1434getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1435 ThreadContext *tc)
1436{
1437 int index = 0;
1438 unsigned resource = process->getSyscallArg(tc, index);
1439 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1440
1441 switch (resource) {
1442 case OS::TGT_RLIMIT_STACK:
1443 // max stack size in bytes: make up a number (8MB for now)
1444 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1445 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1446 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1447 break;
1448
1449 case OS::TGT_RLIMIT_DATA:
1450 // max data segment size in bytes: make up a number
1451 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1452 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1453 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1454 break;
1455
1456 default:
1457 warn("getrlimit: unimplemented resource %d", resource);
1458 return -EINVAL;
1459 break;
1460 }
1461
1462 rlp.copyOut(tc->getMemProxy());
1463 return 0;
1464}
1465
1466/// Target clock_gettime() function.
1467template <class OS>
1468SyscallReturn
1469clock_gettimeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1470{
1471 int index = 1;
1472 //int clk_id = p->getSyscallArg(tc, index);
1473 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1474
1475 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1476 tp->tv_sec += seconds_since_epoch;
1477 tp->tv_sec = TheISA::htog(tp->tv_sec);
1478 tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1479
1480 tp.copyOut(tc->getMemProxy());
1481
1482 return 0;
1483}
1484
1485/// Target clock_getres() function.
1486template <class OS>
1487SyscallReturn
1488clock_getresFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1489{
1490 int index = 1;
1491 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1492
1493 // Set resolution at ns, which is what clock_gettime() returns
1494 tp->tv_sec = 0;
1495 tp->tv_nsec = 1;
1496
1497 tp.copyOut(tc->getMemProxy());
1498
1499 return 0;
1500}
1501
1502/// Target gettimeofday() handler.
1503template <class OS>
1504SyscallReturn
1505gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1506 ThreadContext *tc)
1507{
1508 int index = 0;
1509 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1510
1511 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1512 tp->tv_sec += seconds_since_epoch;
1513 tp->tv_sec = TheISA::htog(tp->tv_sec);
1514 tp->tv_usec = TheISA::htog(tp->tv_usec);
1515
1516 tp.copyOut(tc->getMemProxy());
1517
1518 return 0;
1519}
1520
1521
1522/// Target utimes() handler.
1523template <class OS>
1524SyscallReturn
1525utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1526 ThreadContext *tc)
1527{
1528 std::string path;
1529
1530 int index = 0;
1531 if (!tc->getMemProxy().tryReadString(path,
1532 process->getSyscallArg(tc, index))) {
1533 return -EFAULT;
1534 }
1535
1536 TypedBufferArg<typename OS::timeval [2]>
1537 tp(process->getSyscallArg(tc, index));
1538 tp.copyIn(tc->getMemProxy());
1539
1540 struct timeval hostTimeval[2];
1541 for (int i = 0; i < 2; ++i)
1542 {
1543 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1544 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1545 }
1546
1547 // Adjust path for current working directory
1548 path = process->fullPath(path);
1549
1550 int result = utimes(path.c_str(), hostTimeval);
1551
1552 if (result < 0)
1553 return -errno;
1554
1555 return 0;
1556}
1557/// Target getrusage() function.
1558template <class OS>
1559SyscallReturn
1560getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1561 ThreadContext *tc)
1562{
1563 int index = 0;
1564 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1565 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1566
1567 rup->ru_utime.tv_sec = 0;
1568 rup->ru_utime.tv_usec = 0;
1569 rup->ru_stime.tv_sec = 0;
1570 rup->ru_stime.tv_usec = 0;
1571 rup->ru_maxrss = 0;
1572 rup->ru_ixrss = 0;
1573 rup->ru_idrss = 0;
1574 rup->ru_isrss = 0;
1575 rup->ru_minflt = 0;
1576 rup->ru_majflt = 0;
1577 rup->ru_nswap = 0;
1578 rup->ru_inblock = 0;
1579 rup->ru_oublock = 0;
1580 rup->ru_msgsnd = 0;
1581 rup->ru_msgrcv = 0;
1582 rup->ru_nsignals = 0;
1583 rup->ru_nvcsw = 0;
1584 rup->ru_nivcsw = 0;
1585
1586 switch (who) {
1587 case OS::TGT_RUSAGE_SELF:
1588 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1589 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1590 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1591 break;
1592
1593 case OS::TGT_RUSAGE_CHILDREN:
1594 // do nothing. We have no child processes, so they take no time.
1595 break;
1596
1597 default:
1598 // don't really handle THREAD or CHILDREN, but just warn and
1599 // plow ahead
1600 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1601 who);
1602 }
1603
1604 rup.copyOut(tc->getMemProxy());
1605
1606 return 0;
1607}
1608
1609/// Target times() function.
1610template <class OS>
1611SyscallReturn
1612timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1613 ThreadContext *tc)
1614{
1615 int index = 0;
1616 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1617
1618 // Fill in the time structure (in clocks)
1619 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1620 bufp->tms_utime = clocks;
1621 bufp->tms_stime = 0;
1622 bufp->tms_cutime = 0;
1623 bufp->tms_cstime = 0;
1624
1625 // Convert to host endianness
1626 bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1627
1628 // Write back
1629 bufp.copyOut(tc->getMemProxy());
1630
1631 // Return clock ticks since system boot
1632 return clocks;
1633}
1634
1635/// Target time() function.
1636template <class OS>
1637SyscallReturn
1638timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1639 ThreadContext *tc)
1640{
1641 typename OS::time_t sec, usec;
1642 getElapsedTimeMicro(sec, usec);
1643 sec += seconds_since_epoch;
1644
1645 int index = 0;
1646 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1647 if (taddr != 0) {
1648 typename OS::time_t t = sec;
1649 t = TheISA::htog(t);
1650 SETranslatingPortProxy &p = tc->getMemProxy();
1651 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1652 }
1653 return sec;
1654}
1655
1656
1657#endif // __SIM_SYSCALL_EMUL_HH__
| 1298 if (sim_fd < 0)
1299 return -EBADF;
1300
1301 pmap = (decltype(pmap))mmap(NULL, length, PROT_READ, MAP_PRIVATE,
1302 sim_fd, offset);
1303
1304 if (pmap == (decltype(pmap))-1) {
1305 warn("mmap: failed to map file into host address space");
1306 return -errno;
1307 }
1308 }
1309
1310 // Extend global mmap region if necessary. Note that we ignore the
1311 // start address unless MAP_FIXED is specified.
1312 if (!(tgt_flags & OS::TGT_MAP_FIXED)) {
1313 start = p->mmapGrowsDown() ? p->mmap_end - length : p->mmap_end;
1314 p->mmap_end = p->mmapGrowsDown() ? start : p->mmap_end + length;
1315 }
1316
1317 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n",
1318 start, start + length - 1);
1319
1320 // We only allow mappings to overwrite existing mappings if
1321 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem
1322 // because we ignore the start hint if TGT_MAP_FIXED is not set.
1323 int clobber = tgt_flags & OS::TGT_MAP_FIXED;
1324 if (clobber) {
1325 for (auto tc : p->system->threadContexts) {
1326 // If we might be overwriting old mappings, we need to
1327 // invalidate potentially stale mappings out of the TLBs.
1328 tc->getDTBPtr()->flushAll();
1329 tc->getITBPtr()->flushAll();
1330 }
1331 }
1332
1333 // Allocate physical memory and map it in. If the page table is already
1334 // mapped and clobber is not set, the simulator will issue throw a
1335 // fatal and bail out of the simulation.
1336 p->allocateMem(start, length, clobber);
1337
1338 // Transfer content into target address space.
1339 SETranslatingPortProxy &tp = tc->getMemProxy();
1340 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) {
1341 // In general, we should zero the mapped area for anonymous mappings,
1342 // with something like:
1343 // tp.memsetBlob(start, 0, length);
1344 // However, given that we don't support sparse mappings, and
1345 // some applications can map a couple of gigabytes of space
1346 // (intending sparse usage), that can get painfully expensive.
1347 // Fortunately, since we don't properly implement munmap either,
1348 // there's no danger of remapping used memory, so for now all
1349 // newly mapped memory should already be zeroed so we can skip it.
1350 } else {
1351 // It is possible to mmap an area larger than a file, however
1352 // accessing unmapped portions the system triggers a "Bus error"
1353 // on the host. We must know when to stop copying the file from
1354 // the host into the target address space.
1355 struct stat file_stat;
1356 if (fstat(sim_fd, &file_stat) > 0)
1357 fatal("mmap: cannot stat file");
1358
1359 // Copy the portion of the file that is resident. This requires
1360 // checking both the mmap size and the filesize that we are
1361 // trying to mmap into this space; the mmap size also depends
1362 // on the specified offset into the file.
1363 uint64_t size = std::min((uint64_t)file_stat.st_size - offset,
1364 length);
1365 tp.writeBlob(start, pmap, size);
1366
1367 // Cleanup the mmap region before exiting this function.
1368 munmap(pmap, length);
1369
1370 // Maintain the symbol table for dynamic executables.
1371 // The loader will call mmap to map the images into its address
1372 // space and we intercept that here. We can verify that we are
1373 // executing inside the loader by checking the program counter value.
1374 // XXX: with multiprogrammed workloads or multi-node configurations,
1375 // this will not work since there is a single global symbol table.
1376 ObjectFile *interpreter = p->getInterpreter();
1377 if (interpreter) {
1378 Addr text_start = interpreter->textBase();
1379 Addr text_end = text_start + interpreter->textSize();
1380
1381 Addr pc = tc->pcState().pc();
1382
1383 if (pc >= text_start && pc < text_end) {
1384 FDEntry *fde = p->getFDEntry(tgt_fd);
1385
1386 ObjectFile *lib = createObjectFile(fde->filename);
1387
1388 if (lib) {
1389 lib->loadAllSymbols(debugSymbolTable,
1390 lib->textBase(), start);
1391 }
1392 }
1393 }
1394
1395 // Note that we do not zero out the remainder of the mapping. This
1396 // is done by a real system, but it probably will not affect
1397 // execution (hopefully).
1398 }
1399
1400 return start;
1401}
1402
1403template <class OS>
1404SyscallReturn
1405pwrite64Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1406{
1407 int index = 0;
1408 int tgt_fd = p->getSyscallArg(tc, index);
1409 Addr bufPtr = p->getSyscallArg(tc, index);
1410 int nbytes = p->getSyscallArg(tc, index);
1411 int offset = p->getSyscallArg(tc, index);
1412
1413 int sim_fd = p->getSimFD(tgt_fd);
1414 if (sim_fd < 0)
1415 return -EBADF;
1416
1417 BufferArg bufArg(bufPtr, nbytes);
1418 bufArg.copyIn(tc->getMemProxy());
1419
1420 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset);
1421
1422 return (bytes_written == -1) ? -errno : bytes_written;
1423}
1424
1425/// Target mmap() handler.
1426template <class OS>
1427SyscallReturn
1428mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1429{
1430 return mmapImpl<OS>(desc, num, p, tc, false);
1431}
1432
1433/// Target mmap2() handler.
1434template <class OS>
1435SyscallReturn
1436mmap2Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1437{
1438 return mmapImpl<OS>(desc, num, p, tc, true);
1439}
1440
1441/// Target getrlimit() handler.
1442template <class OS>
1443SyscallReturn
1444getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1445 ThreadContext *tc)
1446{
1447 int index = 0;
1448 unsigned resource = process->getSyscallArg(tc, index);
1449 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1450
1451 switch (resource) {
1452 case OS::TGT_RLIMIT_STACK:
1453 // max stack size in bytes: make up a number (8MB for now)
1454 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1455 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1456 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1457 break;
1458
1459 case OS::TGT_RLIMIT_DATA:
1460 // max data segment size in bytes: make up a number
1461 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1462 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1463 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1464 break;
1465
1466 default:
1467 warn("getrlimit: unimplemented resource %d", resource);
1468 return -EINVAL;
1469 break;
1470 }
1471
1472 rlp.copyOut(tc->getMemProxy());
1473 return 0;
1474}
1475
1476/// Target clock_gettime() function.
1477template <class OS>
1478SyscallReturn
1479clock_gettimeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1480{
1481 int index = 1;
1482 //int clk_id = p->getSyscallArg(tc, index);
1483 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1484
1485 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1486 tp->tv_sec += seconds_since_epoch;
1487 tp->tv_sec = TheISA::htog(tp->tv_sec);
1488 tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1489
1490 tp.copyOut(tc->getMemProxy());
1491
1492 return 0;
1493}
1494
1495/// Target clock_getres() function.
1496template <class OS>
1497SyscallReturn
1498clock_getresFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1499{
1500 int index = 1;
1501 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1502
1503 // Set resolution at ns, which is what clock_gettime() returns
1504 tp->tv_sec = 0;
1505 tp->tv_nsec = 1;
1506
1507 tp.copyOut(tc->getMemProxy());
1508
1509 return 0;
1510}
1511
1512/// Target gettimeofday() handler.
1513template <class OS>
1514SyscallReturn
1515gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1516 ThreadContext *tc)
1517{
1518 int index = 0;
1519 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1520
1521 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1522 tp->tv_sec += seconds_since_epoch;
1523 tp->tv_sec = TheISA::htog(tp->tv_sec);
1524 tp->tv_usec = TheISA::htog(tp->tv_usec);
1525
1526 tp.copyOut(tc->getMemProxy());
1527
1528 return 0;
1529}
1530
1531
1532/// Target utimes() handler.
1533template <class OS>
1534SyscallReturn
1535utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1536 ThreadContext *tc)
1537{
1538 std::string path;
1539
1540 int index = 0;
1541 if (!tc->getMemProxy().tryReadString(path,
1542 process->getSyscallArg(tc, index))) {
1543 return -EFAULT;
1544 }
1545
1546 TypedBufferArg<typename OS::timeval [2]>
1547 tp(process->getSyscallArg(tc, index));
1548 tp.copyIn(tc->getMemProxy());
1549
1550 struct timeval hostTimeval[2];
1551 for (int i = 0; i < 2; ++i)
1552 {
1553 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1554 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1555 }
1556
1557 // Adjust path for current working directory
1558 path = process->fullPath(path);
1559
1560 int result = utimes(path.c_str(), hostTimeval);
1561
1562 if (result < 0)
1563 return -errno;
1564
1565 return 0;
1566}
1567/// Target getrusage() function.
1568template <class OS>
1569SyscallReturn
1570getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1571 ThreadContext *tc)
1572{
1573 int index = 0;
1574 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1575 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1576
1577 rup->ru_utime.tv_sec = 0;
1578 rup->ru_utime.tv_usec = 0;
1579 rup->ru_stime.tv_sec = 0;
1580 rup->ru_stime.tv_usec = 0;
1581 rup->ru_maxrss = 0;
1582 rup->ru_ixrss = 0;
1583 rup->ru_idrss = 0;
1584 rup->ru_isrss = 0;
1585 rup->ru_minflt = 0;
1586 rup->ru_majflt = 0;
1587 rup->ru_nswap = 0;
1588 rup->ru_inblock = 0;
1589 rup->ru_oublock = 0;
1590 rup->ru_msgsnd = 0;
1591 rup->ru_msgrcv = 0;
1592 rup->ru_nsignals = 0;
1593 rup->ru_nvcsw = 0;
1594 rup->ru_nivcsw = 0;
1595
1596 switch (who) {
1597 case OS::TGT_RUSAGE_SELF:
1598 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1599 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1600 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1601 break;
1602
1603 case OS::TGT_RUSAGE_CHILDREN:
1604 // do nothing. We have no child processes, so they take no time.
1605 break;
1606
1607 default:
1608 // don't really handle THREAD or CHILDREN, but just warn and
1609 // plow ahead
1610 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1611 who);
1612 }
1613
1614 rup.copyOut(tc->getMemProxy());
1615
1616 return 0;
1617}
1618
1619/// Target times() function.
1620template <class OS>
1621SyscallReturn
1622timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1623 ThreadContext *tc)
1624{
1625 int index = 0;
1626 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1627
1628 // Fill in the time structure (in clocks)
1629 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1630 bufp->tms_utime = clocks;
1631 bufp->tms_stime = 0;
1632 bufp->tms_cutime = 0;
1633 bufp->tms_cstime = 0;
1634
1635 // Convert to host endianness
1636 bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1637
1638 // Write back
1639 bufp.copyOut(tc->getMemProxy());
1640
1641 // Return clock ticks since system boot
1642 return clocks;
1643}
1644
1645/// Target time() function.
1646template <class OS>
1647SyscallReturn
1648timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1649 ThreadContext *tc)
1650{
1651 typename OS::time_t sec, usec;
1652 getElapsedTimeMicro(sec, usec);
1653 sec += seconds_since_epoch;
1654
1655 int index = 0;
1656 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1657 if (taddr != 0) {
1658 typename OS::time_t t = sec;
1659 t = TheISA::htog(t);
1660 SETranslatingPortProxy &p = tc->getMemProxy();
1661 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1662 }
1663 return sec;
1664}
1665
1666
1667#endif // __SIM_SYSCALL_EMUL_HH__
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