63#include "mem/page_table.hh"
64#include "mem/translating_port.hh"
65#include "sim/byteswap.hh"
66#include "sim/process.hh"
67#include "sim/system.hh"
68
69///
70/// System call descriptor.
71///
72class SyscallDesc {
73
74 public:
75
76 /// Typedef for target syscall handler functions.
77 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
78 LiveProcess *, ThreadContext *);
79
80 const char *name; //!< Syscall name (e.g., "open").
81 FuncPtr funcPtr; //!< Pointer to emulation function.
82 int flags; //!< Flags (see Flags enum).
83
84 /// Flag values for controlling syscall behavior.
85 enum Flags {
86 /// Don't set return regs according to funcPtr return value.
87 /// Used for syscalls with non-standard return conventions
88 /// that explicitly set the ThreadContext regs (e.g.,
89 /// sigreturn).
90 SuppressReturnValue = 1
91 };
92
93 /// Constructor.
94 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
95 : name(_name), funcPtr(_funcPtr), flags(_flags)
96 {
97 }
98
99 /// Emulate the syscall. Public interface for calling through funcPtr.
100 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
101};
102
103
104class BaseBufferArg {
105
106 public:
107
108 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
109 {
110 bufPtr = new uint8_t[size];
111 // clear out buffer: in case we only partially populate this,
112 // and then do a copyOut(), we want to make sure we don't
113 // introduce any random junk into the simulated address space
114 memset(bufPtr, 0, size);
115 }
116
117 virtual ~BaseBufferArg() { delete [] bufPtr; }
118
119 //
120 // copy data into simulator space (read from target memory)
121 //
122 virtual bool copyIn(TranslatingPort *memport)
123 {
124 memport->readBlob(addr, bufPtr, size);
125 return true; // no EFAULT detection for now
126 }
127
128 //
129 // copy data out of simulator space (write to target memory)
130 //
131 virtual bool copyOut(TranslatingPort *memport)
132 {
133 memport->writeBlob(addr, bufPtr, size);
134 return true; // no EFAULT detection for now
135 }
136
137 protected:
138 Addr addr;
139 int size;
140 uint8_t *bufPtr;
141};
142
143
144class BufferArg : public BaseBufferArg
145{
146 public:
147 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
148 void *bufferPtr() { return bufPtr; }
149};
150
151template <class T>
152class TypedBufferArg : public BaseBufferArg
153{
154 public:
155 // user can optionally specify a specific number of bytes to
156 // allocate to deal with those structs that have variable-size
157 // arrays at the end
158 TypedBufferArg(Addr _addr, int _size = sizeof(T))
159 : BaseBufferArg(_addr, _size)
160 { }
161
162 // type case
163 operator T*() { return (T *)bufPtr; }
164
165 // dereference operators
166 T &operator*() { return *((T *)bufPtr); }
167 T* operator->() { return (T *)bufPtr; }
168 T &operator[](int i) { return ((T *)bufPtr)[i]; }
169};
170
171//////////////////////////////////////////////////////////////////////
172//
173// The following emulation functions are generic enough that they
174// don't need to be recompiled for different emulated OS's. They are
175// defined in sim/syscall_emul.cc.
176//
177//////////////////////////////////////////////////////////////////////
178
179
180/// Handler for unimplemented syscalls that we haven't thought about.
181SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
182 LiveProcess *p, ThreadContext *tc);
183
184/// Handler for unimplemented syscalls that we never intend to
185/// implement (signal handling, etc.) and should not affect the correct
186/// behavior of the program. Print a warning only if the appropriate
187/// trace flag is enabled. Return success to the target program.
188SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
189 LiveProcess *p, ThreadContext *tc);
190SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
191 LiveProcess *p, ThreadContext *tc);
192
193/// Target exit() handler: terminate current context.
194SyscallReturn exitFunc(SyscallDesc *desc, int num,
195 LiveProcess *p, ThreadContext *tc);
196
197/// Target exit_group() handler: terminate simulation. (exit all threads)
198SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
199 LiveProcess *p, ThreadContext *tc);
200
201/// Target getpagesize() handler.
202SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
203 LiveProcess *p, ThreadContext *tc);
204
205/// Target brk() handler: set brk address.
206SyscallReturn brkFunc(SyscallDesc *desc, int num,
207 LiveProcess *p, ThreadContext *tc);
208
209/// Target close() handler.
210SyscallReturn closeFunc(SyscallDesc *desc, int num,
211 LiveProcess *p, ThreadContext *tc);
212
213/// Target read() handler.
214SyscallReturn readFunc(SyscallDesc *desc, int num,
215 LiveProcess *p, ThreadContext *tc);
216
217/// Target write() handler.
218SyscallReturn writeFunc(SyscallDesc *desc, int num,
219 LiveProcess *p, ThreadContext *tc);
220
221/// Target lseek() handler.
222SyscallReturn lseekFunc(SyscallDesc *desc, int num,
223 LiveProcess *p, ThreadContext *tc);
224
225/// Target _llseek() handler.
226SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
227 LiveProcess *p, ThreadContext *tc);
228
229/// Target munmap() handler.
230SyscallReturn munmapFunc(SyscallDesc *desc, int num,
231 LiveProcess *p, ThreadContext *tc);
232
233/// Target gethostname() handler.
234SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
235 LiveProcess *p, ThreadContext *tc);
236
237/// Target getcwd() handler.
238SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
239 LiveProcess *p, ThreadContext *tc);
240
241/// Target unlink() handler.
242SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
243 LiveProcess *p, ThreadContext *tc);
244
245/// Target unlink() handler.
246SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
247 LiveProcess *p, ThreadContext *tc);
248
249/// Target mkdir() handler.
250SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
251 LiveProcess *p, ThreadContext *tc);
252
253/// Target rename() handler.
254SyscallReturn renameFunc(SyscallDesc *desc, int num,
255 LiveProcess *p, ThreadContext *tc);
256
257
258/// Target truncate() handler.
259SyscallReturn truncateFunc(SyscallDesc *desc, int num,
260 LiveProcess *p, ThreadContext *tc);
261
262
263/// Target ftruncate() handler.
264SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
265 LiveProcess *p, ThreadContext *tc);
266
267
268/// Target truncate64() handler.
269SyscallReturn truncate64Func(SyscallDesc *desc, int num,
270 LiveProcess *p, ThreadContext *tc);
271
272/// Target ftruncate64() handler.
273SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
274 LiveProcess *p, ThreadContext *tc);
275
276
277/// Target umask() handler.
278SyscallReturn umaskFunc(SyscallDesc *desc, int num,
279 LiveProcess *p, ThreadContext *tc);
280
281
282/// Target chown() handler.
283SyscallReturn chownFunc(SyscallDesc *desc, int num,
284 LiveProcess *p, ThreadContext *tc);
285
286
287/// Target fchown() handler.
288SyscallReturn fchownFunc(SyscallDesc *desc, int num,
289 LiveProcess *p, ThreadContext *tc);
290
291/// Target dup() handler.
292SyscallReturn dupFunc(SyscallDesc *desc, int num,
293 LiveProcess *process, ThreadContext *tc);
294
295/// Target fnctl() handler.
296SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
297 LiveProcess *process, ThreadContext *tc);
298
299/// Target fcntl64() handler.
300SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
301 LiveProcess *process, ThreadContext *tc);
302
303/// Target setuid() handler.
304SyscallReturn setuidFunc(SyscallDesc *desc, int num,
305 LiveProcess *p, ThreadContext *tc);
306
307/// Target getpid() handler.
308SyscallReturn getpidFunc(SyscallDesc *desc, int num,
309 LiveProcess *p, ThreadContext *tc);
310
311/// Target getuid() handler.
312SyscallReturn getuidFunc(SyscallDesc *desc, int num,
313 LiveProcess *p, ThreadContext *tc);
314
315/// Target getgid() handler.
316SyscallReturn getgidFunc(SyscallDesc *desc, int num,
317 LiveProcess *p, ThreadContext *tc);
318
319/// Target getppid() handler.
320SyscallReturn getppidFunc(SyscallDesc *desc, int num,
321 LiveProcess *p, ThreadContext *tc);
322
323/// Target geteuid() handler.
324SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
325 LiveProcess *p, ThreadContext *tc);
326
327/// Target getegid() handler.
328SyscallReturn getegidFunc(SyscallDesc *desc, int num,
329 LiveProcess *p, ThreadContext *tc);
330
331/// Target clone() handler.
332SyscallReturn cloneFunc(SyscallDesc *desc, int num,
333 LiveProcess *p, ThreadContext *tc);
334
335
336/// Pseudo Funcs - These functions use a different return convension,
337/// returning a second value in a register other than the normal return register
338SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
339 LiveProcess *process, ThreadContext *tc);
340
341/// Target getpidPseudo() handler.
342SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
343 LiveProcess *p, ThreadContext *tc);
344
345/// Target getuidPseudo() handler.
346SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
347 LiveProcess *p, ThreadContext *tc);
348
349/// Target getgidPseudo() handler.
350SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
351 LiveProcess *p, ThreadContext *tc);
352
353
354/// A readable name for 1,000,000, for converting microseconds to seconds.
355const int one_million = 1000000;
356
357/// Approximate seconds since the epoch (1/1/1970). About a billion,
358/// by my reckoning. We want to keep this a constant (not use the
359/// real-world time) to keep simulations repeatable.
360const unsigned seconds_since_epoch = 1000000000;
361
362/// Helper function to convert current elapsed time to seconds and
363/// microseconds.
364template <class T1, class T2>
365void
366getElapsedTime(T1 &sec, T2 &usec)
367{
368 int elapsed_usecs = curTick() / SimClock::Int::us;
369 sec = elapsed_usecs / one_million;
370 usec = elapsed_usecs % one_million;
371}
372
373//////////////////////////////////////////////////////////////////////
374//
375// The following emulation functions are generic, but need to be
376// templated to account for differences in types, constants, etc.
377//
378//////////////////////////////////////////////////////////////////////
379
380#if NO_STAT64
381 typedef struct stat hst_stat;
382 typedef struct stat hst_stat64;
383#else
384 typedef struct stat hst_stat;
385 typedef struct stat64 hst_stat64;
386#endif
387
388//// Helper function to convert a host stat buffer to a target stat
389//// buffer. Also copies the target buffer out to the simulated
390//// memory space. Used by stat(), fstat(), and lstat().
391
392template <typename target_stat, typename host_stat>
393static void
394convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
395{
396 using namespace TheISA;
397
398 if (fakeTTY)
399 tgt->st_dev = 0xA;
400 else
401 tgt->st_dev = host->st_dev;
402 tgt->st_dev = htog(tgt->st_dev);
403 tgt->st_ino = host->st_ino;
404 tgt->st_ino = htog(tgt->st_ino);
405 tgt->st_mode = host->st_mode;
406 if (fakeTTY) {
407 // Claim to be a character device
408 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
409 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
410 }
411 tgt->st_mode = htog(tgt->st_mode);
412 tgt->st_nlink = host->st_nlink;
413 tgt->st_nlink = htog(tgt->st_nlink);
414 tgt->st_uid = host->st_uid;
415 tgt->st_uid = htog(tgt->st_uid);
416 tgt->st_gid = host->st_gid;
417 tgt->st_gid = htog(tgt->st_gid);
418 if (fakeTTY)
419 tgt->st_rdev = 0x880d;
420 else
421 tgt->st_rdev = host->st_rdev;
422 tgt->st_rdev = htog(tgt->st_rdev);
423 tgt->st_size = host->st_size;
424 tgt->st_size = htog(tgt->st_size);
425 tgt->st_atimeX = host->st_atime;
426 tgt->st_atimeX = htog(tgt->st_atimeX);
427 tgt->st_mtimeX = host->st_mtime;
428 tgt->st_mtimeX = htog(tgt->st_mtimeX);
429 tgt->st_ctimeX = host->st_ctime;
430 tgt->st_ctimeX = htog(tgt->st_ctimeX);
431 // Force the block size to be 8k. This helps to ensure buffered io works
432 // consistently across different hosts.
433 tgt->st_blksize = 0x2000;
434 tgt->st_blksize = htog(tgt->st_blksize);
435 tgt->st_blocks = host->st_blocks;
436 tgt->st_blocks = htog(tgt->st_blocks);
437}
438
439// Same for stat64
440
441template <typename target_stat, typename host_stat64>
442static void
443convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
444{
445 using namespace TheISA;
446
447 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
448#if defined(STAT_HAVE_NSEC)
449 tgt->st_atime_nsec = host->st_atime_nsec;
450 tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
451 tgt->st_mtime_nsec = host->st_mtime_nsec;
452 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
453 tgt->st_ctime_nsec = host->st_ctime_nsec;
454 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
455#else
456 tgt->st_atime_nsec = 0;
457 tgt->st_mtime_nsec = 0;
458 tgt->st_ctime_nsec = 0;
459#endif
460}
461
462//Here are a couple convenience functions
463template<class OS>
464static void
465copyOutStatBuf(TranslatingPort * mem, Addr addr,
466 hst_stat *host, bool fakeTTY = false)
467{
468 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
469 tgt_stat_buf tgt(addr);
470 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
471 tgt.copyOut(mem);
472}
473
474template<class OS>
475static void
476copyOutStat64Buf(TranslatingPort * mem, Addr addr,
477 hst_stat64 *host, bool fakeTTY = false)
478{
479 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
480 tgt_stat_buf tgt(addr);
481 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
482 tgt.copyOut(mem);
483}
484
485/// Target ioctl() handler. For the most part, programs call ioctl()
486/// only to find out if their stdout is a tty, to determine whether to
487/// do line or block buffering.
488template <class OS>
489SyscallReturn
490ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
491 ThreadContext *tc)
492{
493 int index = 0;
494 int fd = process->getSyscallArg(tc, index);
495 unsigned req = process->getSyscallArg(tc, index);
496
497 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
498
499 if (fd < 0 || process->sim_fd(fd) < 0) {
500 // doesn't map to any simulator fd: not a valid target fd
501 return -EBADF;
502 }
503
504 switch (req) {
505 case OS::TIOCISATTY_:
506 case OS::TIOCGETP_:
507 case OS::TIOCSETP_:
508 case OS::TIOCSETN_:
509 case OS::TIOCSETC_:
510 case OS::TIOCGETC_:
511 case OS::TIOCGETS_:
512 case OS::TIOCGETA_:
513 case OS::TCSETAW_:
514 return -ENOTTY;
515
516 default:
517 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
518 fd, req, tc->pcState());
519 }
520}
521
522/// Target open() handler.
523template <class OS>
524SyscallReturn
525openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
526 ThreadContext *tc)
527{
528 std::string path;
529
530 int index = 0;
531 if (!tc->getMemPort()->tryReadString(path,
532 process->getSyscallArg(tc, index)))
533 return -EFAULT;
534
535 if (path == "/dev/sysdev0") {
536 // This is a memory-mapped high-resolution timer device on Alpha.
537 // We don't support it, so just punt.
538 warn("Ignoring open(%s, ...)\n", path);
539 return -ENOENT;
540 }
541
542 int tgtFlags = process->getSyscallArg(tc, index);
543 int mode = process->getSyscallArg(tc, index);
544 int hostFlags = 0;
545
546 // translate open flags
547 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
548 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
549 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
550 hostFlags |= OS::openFlagTable[i].hostFlag;
551 }
552 }
553
554 // any target flags left?
555 if (tgtFlags != 0)
556 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
557
558#ifdef __CYGWIN32__
559 hostFlags |= O_BINARY;
560#endif
561
562 // Adjust path for current working directory
563 path = process->fullPath(path);
564
565 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
566
567 int fd;
568 if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
569 !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
570 // It's a proc/sys entery and requires special handling
571 fd = OS::openSpecialFile(path, process, tc);
572 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
573 } else {
574 // open the file
575 fd = open(path.c_str(), hostFlags, mode);
576 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
577 }
578
579}
580
581/// Target sysinfo() handler.
582template <class OS>
583SyscallReturn
584sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
585 ThreadContext *tc)
586{
587
588 int index = 0;
589 TypedBufferArg<typename OS::tgt_sysinfo>
590 sysinfo(process->getSyscallArg(tc, index));
591
592 sysinfo->uptime=seconds_since_epoch;
593 sysinfo->totalram=process->system->memSize();
594
595 sysinfo.copyOut(tc->getMemPort());
596
597 return 0;
598}
599
600/// Target chmod() handler.
601template <class OS>
602SyscallReturn
603chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
604 ThreadContext *tc)
605{
606 std::string path;
607
608 int index = 0;
609 if (!tc->getMemPort()->tryReadString(path,
610 process->getSyscallArg(tc, index))) {
611 return -EFAULT;
612 }
613
614 uint32_t mode = process->getSyscallArg(tc, index);
615 mode_t hostMode = 0;
616
617 // XXX translate mode flags via OS::something???
618 hostMode = mode;
619
620 // Adjust path for current working directory
621 path = process->fullPath(path);
622
623 // do the chmod
624 int result = chmod(path.c_str(), hostMode);
625 if (result < 0)
626 return -errno;
627
628 return 0;
629}
630
631
632/// Target fchmod() handler.
633template <class OS>
634SyscallReturn
635fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
636 ThreadContext *tc)
637{
638 int index = 0;
639 int fd = process->getSyscallArg(tc, index);
640 if (fd < 0 || process->sim_fd(fd) < 0) {
641 // doesn't map to any simulator fd: not a valid target fd
642 return -EBADF;
643 }
644
645 uint32_t mode = process->getSyscallArg(tc, index);
646 mode_t hostMode = 0;
647
648 // XXX translate mode flags via OS::someting???
649 hostMode = mode;
650
651 // do the fchmod
652 int result = fchmod(process->sim_fd(fd), hostMode);
653 if (result < 0)
654 return -errno;
655
656 return 0;
657}
658
659/// Target mremap() handler.
660template <class OS>
661SyscallReturn
662mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
663{
664 int index = 0;
665 Addr start = process->getSyscallArg(tc, index);
666 uint64_t old_length = process->getSyscallArg(tc, index);
667 uint64_t new_length = process->getSyscallArg(tc, index);
668 uint64_t flags = process->getSyscallArg(tc, index);
669
670 if ((start % TheISA::VMPageSize != 0) ||
671 (new_length % TheISA::VMPageSize != 0)) {
672 warn("mremap failing: arguments not page aligned");
673 return -EINVAL;
674 }
675
676 if (new_length > old_length) {
677 if ((start + old_length) == process->mmap_end) {
678 uint64_t diff = new_length - old_length;
679 process->pTable->allocate(process->mmap_end, diff);
680 process->mmap_end += diff;
681 return start;
682 } else {
683 // sys/mman.h defined MREMAP_MAYMOVE
684 if (!(flags & 1)) {
685 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
686 return -ENOMEM;
687 } else {
688 process->pTable->remap(start, old_length, process->mmap_end);
689 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
690 process->mmap_end, process->mmap_end + new_length, new_length);
691 start = process->mmap_end;
692 // add on the remaining unallocated pages
693 process->pTable->allocate(start + old_length, new_length - old_length);
694 process->mmap_end += new_length;
695 warn("returning %08p as start\n", start);
696 return start;
697 }
698 }
699 } else {
700 process->pTable->deallocate(start + new_length, old_length -
701 new_length);
702 return start;
703 }
704}
705
706/// Target stat() handler.
707template <class OS>
708SyscallReturn
709statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
710 ThreadContext *tc)
711{
712 std::string path;
713
714 int index = 0;
715 if (!tc->getMemPort()->tryReadString(path,
716 process->getSyscallArg(tc, index))) {
717 return -EFAULT;
718 }
719 Addr bufPtr = process->getSyscallArg(tc, index);
720
721 // Adjust path for current working directory
722 path = process->fullPath(path);
723
724 struct stat hostBuf;
725 int result = stat(path.c_str(), &hostBuf);
726
727 if (result < 0)
728 return -errno;
729
730 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
731
732 return 0;
733}
734
735
736/// Target stat64() handler.
737template <class OS>
738SyscallReturn
739stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
740 ThreadContext *tc)
741{
742 std::string path;
743
744 int index = 0;
745 if (!tc->getMemPort()->tryReadString(path,
746 process->getSyscallArg(tc, index)))
747 return -EFAULT;
748 Addr bufPtr = process->getSyscallArg(tc, index);
749
750 // Adjust path for current working directory
751 path = process->fullPath(path);
752
753#if NO_STAT64
754 struct stat hostBuf;
755 int result = stat(path.c_str(), &hostBuf);
756#else
757 struct stat64 hostBuf;
758 int result = stat64(path.c_str(), &hostBuf);
759#endif
760
761 if (result < 0)
762 return -errno;
763
764 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
765
766 return 0;
767}
768
769
770/// Target fstat64() handler.
771template <class OS>
772SyscallReturn
773fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
774 ThreadContext *tc)
775{
776 int index = 0;
777 int fd = process->getSyscallArg(tc, index);
778 Addr bufPtr = process->getSyscallArg(tc, index);
779 if (fd < 0 || process->sim_fd(fd) < 0) {
780 // doesn't map to any simulator fd: not a valid target fd
781 return -EBADF;
782 }
783
784#if NO_STAT64
785 struct stat hostBuf;
786 int result = fstat(process->sim_fd(fd), &hostBuf);
787#else
788 struct stat64 hostBuf;
789 int result = fstat64(process->sim_fd(fd), &hostBuf);
790#endif
791
792 if (result < 0)
793 return -errno;
794
795 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
796
797 return 0;
798}
799
800
801/// Target lstat() handler.
802template <class OS>
803SyscallReturn
804lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
805 ThreadContext *tc)
806{
807 std::string path;
808
809 int index = 0;
810 if (!tc->getMemPort()->tryReadString(path,
811 process->getSyscallArg(tc, index))) {
812 return -EFAULT;
813 }
814 Addr bufPtr = process->getSyscallArg(tc, index);
815
816 // Adjust path for current working directory
817 path = process->fullPath(path);
818
819 struct stat hostBuf;
820 int result = lstat(path.c_str(), &hostBuf);
821
822 if (result < 0)
823 return -errno;
824
825 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
826
827 return 0;
828}
829
830/// Target lstat64() handler.
831template <class OS>
832SyscallReturn
833lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
834 ThreadContext *tc)
835{
836 std::string path;
837
838 int index = 0;
839 if (!tc->getMemPort()->tryReadString(path,
840 process->getSyscallArg(tc, index))) {
841 return -EFAULT;
842 }
843 Addr bufPtr = process->getSyscallArg(tc, index);
844
845 // Adjust path for current working directory
846 path = process->fullPath(path);
847
848#if NO_STAT64
849 struct stat hostBuf;
850 int result = lstat(path.c_str(), &hostBuf);
851#else
852 struct stat64 hostBuf;
853 int result = lstat64(path.c_str(), &hostBuf);
854#endif
855
856 if (result < 0)
857 return -errno;
858
859 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
860
861 return 0;
862}
863
864/// Target fstat() handler.
865template <class OS>
866SyscallReturn
867fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
868 ThreadContext *tc)
869{
870 int index = 0;
871 int fd = process->sim_fd(process->getSyscallArg(tc, index));
872 Addr bufPtr = process->getSyscallArg(tc, index);
873
874 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
875
876 if (fd < 0)
877 return -EBADF;
878
879 struct stat hostBuf;
880 int result = fstat(fd, &hostBuf);
881
882 if (result < 0)
883 return -errno;
884
885 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
886
887 return 0;
888}
889
890
891/// Target statfs() handler.
892template <class OS>
893SyscallReturn
894statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
895 ThreadContext *tc)
896{
897 std::string path;
898
899 int index = 0;
900 if (!tc->getMemPort()->tryReadString(path,
901 process->getSyscallArg(tc, index))) {
902 return -EFAULT;
903 }
904 Addr bufPtr = process->getSyscallArg(tc, index);
905
906 // Adjust path for current working directory
907 path = process->fullPath(path);
908
909 struct statfs hostBuf;
910 int result = statfs(path.c_str(), &hostBuf);
911
912 if (result < 0)
913 return -errno;
914
915 OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
916
917 return 0;
918}
919
920
921/// Target fstatfs() handler.
922template <class OS>
923SyscallReturn
924fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
925 ThreadContext *tc)
926{
927 int index = 0;
928 int fd = process->sim_fd(process->getSyscallArg(tc, index));
929 Addr bufPtr = process->getSyscallArg(tc, index);
930
931 if (fd < 0)
932 return -EBADF;
933
934 struct statfs hostBuf;
935 int result = fstatfs(fd, &hostBuf);
936
937 if (result < 0)
938 return -errno;
939
940 OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
941
942 return 0;
943}
944
945
946/// Target writev() handler.
947template <class OS>
948SyscallReturn
949writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
950 ThreadContext *tc)
951{
952 int index = 0;
953 int fd = process->getSyscallArg(tc, index);
954 if (fd < 0 || process->sim_fd(fd) < 0) {
955 // doesn't map to any simulator fd: not a valid target fd
956 return -EBADF;
957 }
958
959 TranslatingPort *p = tc->getMemPort();
960 uint64_t tiov_base = process->getSyscallArg(tc, index);
961 size_t count = process->getSyscallArg(tc, index);
962 struct iovec hiov[count];
963 for (size_t i = 0; i < count; ++i) {
964 typename OS::tgt_iovec tiov;
965
966 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
967 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
968 hiov[i].iov_len = gtoh(tiov.iov_len);
969 hiov[i].iov_base = new char [hiov[i].iov_len];
970 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
971 hiov[i].iov_len);
972 }
973
974 int result = writev(process->sim_fd(fd), hiov, count);
975
976 for (size_t i = 0; i < count; ++i)
977 delete [] (char *)hiov[i].iov_base;
978
979 if (result < 0)
980 return -errno;
981
982 return 0;
983}
984
985
986/// Target mmap() handler.
987///
988/// We don't really handle mmap(). If the target is mmaping an
989/// anonymous region or /dev/zero, we can get away with doing basically
990/// nothing (since memory is initialized to zero and the simulator
991/// doesn't really check addresses anyway). Always print a warning,
992/// since this could be seriously broken if we're not mapping
993/// /dev/zero.
994//
995/// Someday we should explicitly check for /dev/zero in open, flag the
996/// file descriptor, and fail (or implement!) a non-anonymous mmap to
997/// anything else.
998template <class OS>
999SyscallReturn
1000mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1001{
1002 int index = 0;
1003 Addr start = p->getSyscallArg(tc, index);
1004 uint64_t length = p->getSyscallArg(tc, index);
1005 index++; // int prot = p->getSyscallArg(tc, index);
1006 int flags = p->getSyscallArg(tc, index);
1007 int fd = p->sim_fd(p->getSyscallArg(tc, index));
1008 // int offset = p->getSyscallArg(tc, index);
1009
1010
1011 if ((start % TheISA::VMPageSize) != 0 ||
1012 (length % TheISA::VMPageSize) != 0) {
1013 warn("mmap failing: arguments not page-aligned: "
1014 "start 0x%x length 0x%x",
1015 start, length);
1016 return -EINVAL;
1017 }
1018
1019 if (start != 0) {
1020 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
1021 start, p->mmap_end);
1022 }
1023
1024 // pick next address from our "mmap region"
1025 if (OS::mmapGrowsDown()) {
1026 start = p->mmap_end - length;
1027 p->mmap_end = start;
1028 } else {
1029 start = p->mmap_end;
1030 p->mmap_end += length;
1031 }
1032 p->pTable->allocate(start, length);
1033
1034 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1035 warn("allowing mmap of file @ fd %d. "
1036 "This will break if not /dev/zero.", fd);
1037 }
1038
1039 return start;
1040}
1041
1042/// Target getrlimit() handler.
1043template <class OS>
1044SyscallReturn
1045getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1046 ThreadContext *tc)
1047{
1048 int index = 0;
1049 unsigned resource = process->getSyscallArg(tc, index);
1050 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1051
1052 switch (resource) {
1053 case OS::TGT_RLIMIT_STACK:
1054 // max stack size in bytes: make up a number (8MB for now)
1055 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1056 rlp->rlim_cur = htog(rlp->rlim_cur);
1057 rlp->rlim_max = htog(rlp->rlim_max);
1058 break;
1059
1060 case OS::TGT_RLIMIT_DATA:
1061 // max data segment size in bytes: make up a number
1062 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1063 rlp->rlim_cur = htog(rlp->rlim_cur);
1064 rlp->rlim_max = htog(rlp->rlim_max);
1065 break;
1066
1067 default:
1068 std::cerr << "getrlimitFunc: unimplemented resource " << resource
1069 << std::endl;
1070 abort();
1071 break;
1072 }
1073
1074 rlp.copyOut(tc->getMemPort());
1075 return 0;
1076}
1077
1078/// Target gettimeofday() handler.
1079template <class OS>
1080SyscallReturn
1081gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1082 ThreadContext *tc)
1083{
1084 int index = 0;
1085 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1086
1087 getElapsedTime(tp->tv_sec, tp->tv_usec);
1088 tp->tv_sec += seconds_since_epoch;
1089 tp->tv_sec = TheISA::htog(tp->tv_sec);
1090 tp->tv_usec = TheISA::htog(tp->tv_usec);
1091
1092 tp.copyOut(tc->getMemPort());
1093
1094 return 0;
1095}
1096
1097
1098/// Target utimes() handler.
1099template <class OS>
1100SyscallReturn
1101utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1102 ThreadContext *tc)
1103{
1104 std::string path;
1105
1106 int index = 0;
1107 if (!tc->getMemPort()->tryReadString(path,
1108 process->getSyscallArg(tc, index))) {
1109 return -EFAULT;
1110 }
1111
1112 TypedBufferArg<typename OS::timeval [2]>
1113 tp(process->getSyscallArg(tc, index));
1114 tp.copyIn(tc->getMemPort());
1115
1116 struct timeval hostTimeval[2];
1117 for (int i = 0; i < 2; ++i)
1118 {
1119 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
1120 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
1121 }
1122
1123 // Adjust path for current working directory
1124 path = process->fullPath(path);
1125
1126 int result = utimes(path.c_str(), hostTimeval);
1127
1128 if (result < 0)
1129 return -errno;
1130
1131 return 0;
1132}
1133/// Target getrusage() function.
1134template <class OS>
1135SyscallReturn
1136getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1137 ThreadContext *tc)
1138{
1139 int index = 0;
1140 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1141 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1142
1143 rup->ru_utime.tv_sec = 0;
1144 rup->ru_utime.tv_usec = 0;
1145 rup->ru_stime.tv_sec = 0;
1146 rup->ru_stime.tv_usec = 0;
1147 rup->ru_maxrss = 0;
1148 rup->ru_ixrss = 0;
1149 rup->ru_idrss = 0;
1150 rup->ru_isrss = 0;
1151 rup->ru_minflt = 0;
1152 rup->ru_majflt = 0;
1153 rup->ru_nswap = 0;
1154 rup->ru_inblock = 0;
1155 rup->ru_oublock = 0;
1156 rup->ru_msgsnd = 0;
1157 rup->ru_msgrcv = 0;
1158 rup->ru_nsignals = 0;
1159 rup->ru_nvcsw = 0;
1160 rup->ru_nivcsw = 0;
1161
1162 switch (who) {
1163 case OS::TGT_RUSAGE_SELF:
1164 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1165 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1166 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1167 break;
1168
1169 case OS::TGT_RUSAGE_CHILDREN:
1170 // do nothing. We have no child processes, so they take no time.
1171 break;
1172
1173 default:
1174 // don't really handle THREAD or CHILDREN, but just warn and
1175 // plow ahead
1176 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1177 who);
1178 }
1179
1180 rup.copyOut(tc->getMemPort());
1181
1182 return 0;
1183}
1184
1185/// Target times() function.
1186template <class OS>
1187SyscallReturn
1188timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1189 ThreadContext *tc)
1190{
1191 int index = 0;
1192 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1193
1194 // Fill in the time structure (in clocks)
1195 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1196 bufp->tms_utime = clocks;
1197 bufp->tms_stime = 0;
1198 bufp->tms_cutime = 0;
1199 bufp->tms_cstime = 0;
1200
1201 // Convert to host endianness
1202 bufp->tms_utime = htog(bufp->tms_utime);
1203
1204 // Write back
1205 bufp.copyOut(tc->getMemPort());
1206
1207 // Return clock ticks since system boot
1208 return clocks;
1209}
1210
1211/// Target time() function.
1212template <class OS>
1213SyscallReturn
1214timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1215 ThreadContext *tc)
1216{
1217 typename OS::time_t sec, usec;
1218 getElapsedTime(sec, usec);
1219 sec += seconds_since_epoch;
1220
1221 int index = 0;
1222 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1223 if(taddr != 0) {
1224 typename OS::time_t t = sec;
1225 t = htog(t);
1226 TranslatingPort *p = tc->getMemPort();
1227 p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1228 }
1229 return sec;
1230}
1231
1232
1233#endif // __SIM_SYSCALL_EMUL_HH__
| 64#include "mem/page_table.hh"
65#include "mem/translating_port.hh"
66#include "sim/byteswap.hh"
67#include "sim/process.hh"
68#include "sim/system.hh"
69
70///
71/// System call descriptor.
72///
73class SyscallDesc {
74
75 public:
76
77 /// Typedef for target syscall handler functions.
78 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
79 LiveProcess *, ThreadContext *);
80
81 const char *name; //!< Syscall name (e.g., "open").
82 FuncPtr funcPtr; //!< Pointer to emulation function.
83 int flags; //!< Flags (see Flags enum).
84
85 /// Flag values for controlling syscall behavior.
86 enum Flags {
87 /// Don't set return regs according to funcPtr return value.
88 /// Used for syscalls with non-standard return conventions
89 /// that explicitly set the ThreadContext regs (e.g.,
90 /// sigreturn).
91 SuppressReturnValue = 1
92 };
93
94 /// Constructor.
95 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
96 : name(_name), funcPtr(_funcPtr), flags(_flags)
97 {
98 }
99
100 /// Emulate the syscall. Public interface for calling through funcPtr.
101 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
102};
103
104
105class BaseBufferArg {
106
107 public:
108
109 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
110 {
111 bufPtr = new uint8_t[size];
112 // clear out buffer: in case we only partially populate this,
113 // and then do a copyOut(), we want to make sure we don't
114 // introduce any random junk into the simulated address space
115 memset(bufPtr, 0, size);
116 }
117
118 virtual ~BaseBufferArg() { delete [] bufPtr; }
119
120 //
121 // copy data into simulator space (read from target memory)
122 //
123 virtual bool copyIn(TranslatingPort *memport)
124 {
125 memport->readBlob(addr, bufPtr, size);
126 return true; // no EFAULT detection for now
127 }
128
129 //
130 // copy data out of simulator space (write to target memory)
131 //
132 virtual bool copyOut(TranslatingPort *memport)
133 {
134 memport->writeBlob(addr, bufPtr, size);
135 return true; // no EFAULT detection for now
136 }
137
138 protected:
139 Addr addr;
140 int size;
141 uint8_t *bufPtr;
142};
143
144
145class BufferArg : public BaseBufferArg
146{
147 public:
148 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
149 void *bufferPtr() { return bufPtr; }
150};
151
152template <class T>
153class TypedBufferArg : public BaseBufferArg
154{
155 public:
156 // user can optionally specify a specific number of bytes to
157 // allocate to deal with those structs that have variable-size
158 // arrays at the end
159 TypedBufferArg(Addr _addr, int _size = sizeof(T))
160 : BaseBufferArg(_addr, _size)
161 { }
162
163 // type case
164 operator T*() { return (T *)bufPtr; }
165
166 // dereference operators
167 T &operator*() { return *((T *)bufPtr); }
168 T* operator->() { return (T *)bufPtr; }
169 T &operator[](int i) { return ((T *)bufPtr)[i]; }
170};
171
172//////////////////////////////////////////////////////////////////////
173//
174// The following emulation functions are generic enough that they
175// don't need to be recompiled for different emulated OS's. They are
176// defined in sim/syscall_emul.cc.
177//
178//////////////////////////////////////////////////////////////////////
179
180
181/// Handler for unimplemented syscalls that we haven't thought about.
182SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
183 LiveProcess *p, ThreadContext *tc);
184
185/// Handler for unimplemented syscalls that we never intend to
186/// implement (signal handling, etc.) and should not affect the correct
187/// behavior of the program. Print a warning only if the appropriate
188/// trace flag is enabled. Return success to the target program.
189SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
190 LiveProcess *p, ThreadContext *tc);
191SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
192 LiveProcess *p, ThreadContext *tc);
193
194/// Target exit() handler: terminate current context.
195SyscallReturn exitFunc(SyscallDesc *desc, int num,
196 LiveProcess *p, ThreadContext *tc);
197
198/// Target exit_group() handler: terminate simulation. (exit all threads)
199SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
200 LiveProcess *p, ThreadContext *tc);
201
202/// Target getpagesize() handler.
203SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
204 LiveProcess *p, ThreadContext *tc);
205
206/// Target brk() handler: set brk address.
207SyscallReturn brkFunc(SyscallDesc *desc, int num,
208 LiveProcess *p, ThreadContext *tc);
209
210/// Target close() handler.
211SyscallReturn closeFunc(SyscallDesc *desc, int num,
212 LiveProcess *p, ThreadContext *tc);
213
214/// Target read() handler.
215SyscallReturn readFunc(SyscallDesc *desc, int num,
216 LiveProcess *p, ThreadContext *tc);
217
218/// Target write() handler.
219SyscallReturn writeFunc(SyscallDesc *desc, int num,
220 LiveProcess *p, ThreadContext *tc);
221
222/// Target lseek() handler.
223SyscallReturn lseekFunc(SyscallDesc *desc, int num,
224 LiveProcess *p, ThreadContext *tc);
225
226/// Target _llseek() handler.
227SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
228 LiveProcess *p, ThreadContext *tc);
229
230/// Target munmap() handler.
231SyscallReturn munmapFunc(SyscallDesc *desc, int num,
232 LiveProcess *p, ThreadContext *tc);
233
234/// Target gethostname() handler.
235SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
236 LiveProcess *p, ThreadContext *tc);
237
238/// Target getcwd() handler.
239SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
240 LiveProcess *p, ThreadContext *tc);
241
242/// Target unlink() handler.
243SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
244 LiveProcess *p, ThreadContext *tc);
245
246/// Target unlink() handler.
247SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
248 LiveProcess *p, ThreadContext *tc);
249
250/// Target mkdir() handler.
251SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
252 LiveProcess *p, ThreadContext *tc);
253
254/// Target rename() handler.
255SyscallReturn renameFunc(SyscallDesc *desc, int num,
256 LiveProcess *p, ThreadContext *tc);
257
258
259/// Target truncate() handler.
260SyscallReturn truncateFunc(SyscallDesc *desc, int num,
261 LiveProcess *p, ThreadContext *tc);
262
263
264/// Target ftruncate() handler.
265SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
266 LiveProcess *p, ThreadContext *tc);
267
268
269/// Target truncate64() handler.
270SyscallReturn truncate64Func(SyscallDesc *desc, int num,
271 LiveProcess *p, ThreadContext *tc);
272
273/// Target ftruncate64() handler.
274SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
275 LiveProcess *p, ThreadContext *tc);
276
277
278/// Target umask() handler.
279SyscallReturn umaskFunc(SyscallDesc *desc, int num,
280 LiveProcess *p, ThreadContext *tc);
281
282
283/// Target chown() handler.
284SyscallReturn chownFunc(SyscallDesc *desc, int num,
285 LiveProcess *p, ThreadContext *tc);
286
287
288/// Target fchown() handler.
289SyscallReturn fchownFunc(SyscallDesc *desc, int num,
290 LiveProcess *p, ThreadContext *tc);
291
292/// Target dup() handler.
293SyscallReturn dupFunc(SyscallDesc *desc, int num,
294 LiveProcess *process, ThreadContext *tc);
295
296/// Target fnctl() handler.
297SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
298 LiveProcess *process, ThreadContext *tc);
299
300/// Target fcntl64() handler.
301SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
302 LiveProcess *process, ThreadContext *tc);
303
304/// Target setuid() handler.
305SyscallReturn setuidFunc(SyscallDesc *desc, int num,
306 LiveProcess *p, ThreadContext *tc);
307
308/// Target getpid() handler.
309SyscallReturn getpidFunc(SyscallDesc *desc, int num,
310 LiveProcess *p, ThreadContext *tc);
311
312/// Target getuid() handler.
313SyscallReturn getuidFunc(SyscallDesc *desc, int num,
314 LiveProcess *p, ThreadContext *tc);
315
316/// Target getgid() handler.
317SyscallReturn getgidFunc(SyscallDesc *desc, int num,
318 LiveProcess *p, ThreadContext *tc);
319
320/// Target getppid() handler.
321SyscallReturn getppidFunc(SyscallDesc *desc, int num,
322 LiveProcess *p, ThreadContext *tc);
323
324/// Target geteuid() handler.
325SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
326 LiveProcess *p, ThreadContext *tc);
327
328/// Target getegid() handler.
329SyscallReturn getegidFunc(SyscallDesc *desc, int num,
330 LiveProcess *p, ThreadContext *tc);
331
332/// Target clone() handler.
333SyscallReturn cloneFunc(SyscallDesc *desc, int num,
334 LiveProcess *p, ThreadContext *tc);
335
336
337/// Pseudo Funcs - These functions use a different return convension,
338/// returning a second value in a register other than the normal return register
339SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
340 LiveProcess *process, ThreadContext *tc);
341
342/// Target getpidPseudo() handler.
343SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
344 LiveProcess *p, ThreadContext *tc);
345
346/// Target getuidPseudo() handler.
347SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
348 LiveProcess *p, ThreadContext *tc);
349
350/// Target getgidPseudo() handler.
351SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
352 LiveProcess *p, ThreadContext *tc);
353
354
355/// A readable name for 1,000,000, for converting microseconds to seconds.
356const int one_million = 1000000;
357
358/// Approximate seconds since the epoch (1/1/1970). About a billion,
359/// by my reckoning. We want to keep this a constant (not use the
360/// real-world time) to keep simulations repeatable.
361const unsigned seconds_since_epoch = 1000000000;
362
363/// Helper function to convert current elapsed time to seconds and
364/// microseconds.
365template <class T1, class T2>
366void
367getElapsedTime(T1 &sec, T2 &usec)
368{
369 int elapsed_usecs = curTick() / SimClock::Int::us;
370 sec = elapsed_usecs / one_million;
371 usec = elapsed_usecs % one_million;
372}
373
374//////////////////////////////////////////////////////////////////////
375//
376// The following emulation functions are generic, but need to be
377// templated to account for differences in types, constants, etc.
378//
379//////////////////////////////////////////////////////////////////////
380
381#if NO_STAT64
382 typedef struct stat hst_stat;
383 typedef struct stat hst_stat64;
384#else
385 typedef struct stat hst_stat;
386 typedef struct stat64 hst_stat64;
387#endif
388
389//// Helper function to convert a host stat buffer to a target stat
390//// buffer. Also copies the target buffer out to the simulated
391//// memory space. Used by stat(), fstat(), and lstat().
392
393template <typename target_stat, typename host_stat>
394static void
395convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
396{
397 using namespace TheISA;
398
399 if (fakeTTY)
400 tgt->st_dev = 0xA;
401 else
402 tgt->st_dev = host->st_dev;
403 tgt->st_dev = htog(tgt->st_dev);
404 tgt->st_ino = host->st_ino;
405 tgt->st_ino = htog(tgt->st_ino);
406 tgt->st_mode = host->st_mode;
407 if (fakeTTY) {
408 // Claim to be a character device
409 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
410 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
411 }
412 tgt->st_mode = htog(tgt->st_mode);
413 tgt->st_nlink = host->st_nlink;
414 tgt->st_nlink = htog(tgt->st_nlink);
415 tgt->st_uid = host->st_uid;
416 tgt->st_uid = htog(tgt->st_uid);
417 tgt->st_gid = host->st_gid;
418 tgt->st_gid = htog(tgt->st_gid);
419 if (fakeTTY)
420 tgt->st_rdev = 0x880d;
421 else
422 tgt->st_rdev = host->st_rdev;
423 tgt->st_rdev = htog(tgt->st_rdev);
424 tgt->st_size = host->st_size;
425 tgt->st_size = htog(tgt->st_size);
426 tgt->st_atimeX = host->st_atime;
427 tgt->st_atimeX = htog(tgt->st_atimeX);
428 tgt->st_mtimeX = host->st_mtime;
429 tgt->st_mtimeX = htog(tgt->st_mtimeX);
430 tgt->st_ctimeX = host->st_ctime;
431 tgt->st_ctimeX = htog(tgt->st_ctimeX);
432 // Force the block size to be 8k. This helps to ensure buffered io works
433 // consistently across different hosts.
434 tgt->st_blksize = 0x2000;
435 tgt->st_blksize = htog(tgt->st_blksize);
436 tgt->st_blocks = host->st_blocks;
437 tgt->st_blocks = htog(tgt->st_blocks);
438}
439
440// Same for stat64
441
442template <typename target_stat, typename host_stat64>
443static void
444convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
445{
446 using namespace TheISA;
447
448 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
449#if defined(STAT_HAVE_NSEC)
450 tgt->st_atime_nsec = host->st_atime_nsec;
451 tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
452 tgt->st_mtime_nsec = host->st_mtime_nsec;
453 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
454 tgt->st_ctime_nsec = host->st_ctime_nsec;
455 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
456#else
457 tgt->st_atime_nsec = 0;
458 tgt->st_mtime_nsec = 0;
459 tgt->st_ctime_nsec = 0;
460#endif
461}
462
463//Here are a couple convenience functions
464template<class OS>
465static void
466copyOutStatBuf(TranslatingPort * mem, Addr addr,
467 hst_stat *host, bool fakeTTY = false)
468{
469 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
470 tgt_stat_buf tgt(addr);
471 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
472 tgt.copyOut(mem);
473}
474
475template<class OS>
476static void
477copyOutStat64Buf(TranslatingPort * mem, Addr addr,
478 hst_stat64 *host, bool fakeTTY = false)
479{
480 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
481 tgt_stat_buf tgt(addr);
482 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
483 tgt.copyOut(mem);
484}
485
486/// Target ioctl() handler. For the most part, programs call ioctl()
487/// only to find out if their stdout is a tty, to determine whether to
488/// do line or block buffering.
489template <class OS>
490SyscallReturn
491ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
492 ThreadContext *tc)
493{
494 int index = 0;
495 int fd = process->getSyscallArg(tc, index);
496 unsigned req = process->getSyscallArg(tc, index);
497
498 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
499
500 if (fd < 0 || process->sim_fd(fd) < 0) {
501 // doesn't map to any simulator fd: not a valid target fd
502 return -EBADF;
503 }
504
505 switch (req) {
506 case OS::TIOCISATTY_:
507 case OS::TIOCGETP_:
508 case OS::TIOCSETP_:
509 case OS::TIOCSETN_:
510 case OS::TIOCSETC_:
511 case OS::TIOCGETC_:
512 case OS::TIOCGETS_:
513 case OS::TIOCGETA_:
514 case OS::TCSETAW_:
515 return -ENOTTY;
516
517 default:
518 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
519 fd, req, tc->pcState());
520 }
521}
522
523/// Target open() handler.
524template <class OS>
525SyscallReturn
526openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
527 ThreadContext *tc)
528{
529 std::string path;
530
531 int index = 0;
532 if (!tc->getMemPort()->tryReadString(path,
533 process->getSyscallArg(tc, index)))
534 return -EFAULT;
535
536 if (path == "/dev/sysdev0") {
537 // This is a memory-mapped high-resolution timer device on Alpha.
538 // We don't support it, so just punt.
539 warn("Ignoring open(%s, ...)\n", path);
540 return -ENOENT;
541 }
542
543 int tgtFlags = process->getSyscallArg(tc, index);
544 int mode = process->getSyscallArg(tc, index);
545 int hostFlags = 0;
546
547 // translate open flags
548 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
549 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
550 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
551 hostFlags |= OS::openFlagTable[i].hostFlag;
552 }
553 }
554
555 // any target flags left?
556 if (tgtFlags != 0)
557 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
558
559#ifdef __CYGWIN32__
560 hostFlags |= O_BINARY;
561#endif
562
563 // Adjust path for current working directory
564 path = process->fullPath(path);
565
566 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
567
568 int fd;
569 if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
570 !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
571 // It's a proc/sys entery and requires special handling
572 fd = OS::openSpecialFile(path, process, tc);
573 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
574 } else {
575 // open the file
576 fd = open(path.c_str(), hostFlags, mode);
577 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
578 }
579
580}
581
582/// Target sysinfo() handler.
583template <class OS>
584SyscallReturn
585sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
586 ThreadContext *tc)
587{
588
589 int index = 0;
590 TypedBufferArg<typename OS::tgt_sysinfo>
591 sysinfo(process->getSyscallArg(tc, index));
592
593 sysinfo->uptime=seconds_since_epoch;
594 sysinfo->totalram=process->system->memSize();
595
596 sysinfo.copyOut(tc->getMemPort());
597
598 return 0;
599}
600
601/// Target chmod() handler.
602template <class OS>
603SyscallReturn
604chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
605 ThreadContext *tc)
606{
607 std::string path;
608
609 int index = 0;
610 if (!tc->getMemPort()->tryReadString(path,
611 process->getSyscallArg(tc, index))) {
612 return -EFAULT;
613 }
614
615 uint32_t mode = process->getSyscallArg(tc, index);
616 mode_t hostMode = 0;
617
618 // XXX translate mode flags via OS::something???
619 hostMode = mode;
620
621 // Adjust path for current working directory
622 path = process->fullPath(path);
623
624 // do the chmod
625 int result = chmod(path.c_str(), hostMode);
626 if (result < 0)
627 return -errno;
628
629 return 0;
630}
631
632
633/// Target fchmod() handler.
634template <class OS>
635SyscallReturn
636fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
637 ThreadContext *tc)
638{
639 int index = 0;
640 int fd = process->getSyscallArg(tc, index);
641 if (fd < 0 || process->sim_fd(fd) < 0) {
642 // doesn't map to any simulator fd: not a valid target fd
643 return -EBADF;
644 }
645
646 uint32_t mode = process->getSyscallArg(tc, index);
647 mode_t hostMode = 0;
648
649 // XXX translate mode flags via OS::someting???
650 hostMode = mode;
651
652 // do the fchmod
653 int result = fchmod(process->sim_fd(fd), hostMode);
654 if (result < 0)
655 return -errno;
656
657 return 0;
658}
659
660/// Target mremap() handler.
661template <class OS>
662SyscallReturn
663mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
664{
665 int index = 0;
666 Addr start = process->getSyscallArg(tc, index);
667 uint64_t old_length = process->getSyscallArg(tc, index);
668 uint64_t new_length = process->getSyscallArg(tc, index);
669 uint64_t flags = process->getSyscallArg(tc, index);
670
671 if ((start % TheISA::VMPageSize != 0) ||
672 (new_length % TheISA::VMPageSize != 0)) {
673 warn("mremap failing: arguments not page aligned");
674 return -EINVAL;
675 }
676
677 if (new_length > old_length) {
678 if ((start + old_length) == process->mmap_end) {
679 uint64_t diff = new_length - old_length;
680 process->pTable->allocate(process->mmap_end, diff);
681 process->mmap_end += diff;
682 return start;
683 } else {
684 // sys/mman.h defined MREMAP_MAYMOVE
685 if (!(flags & 1)) {
686 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
687 return -ENOMEM;
688 } else {
689 process->pTable->remap(start, old_length, process->mmap_end);
690 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
691 process->mmap_end, process->mmap_end + new_length, new_length);
692 start = process->mmap_end;
693 // add on the remaining unallocated pages
694 process->pTable->allocate(start + old_length, new_length - old_length);
695 process->mmap_end += new_length;
696 warn("returning %08p as start\n", start);
697 return start;
698 }
699 }
700 } else {
701 process->pTable->deallocate(start + new_length, old_length -
702 new_length);
703 return start;
704 }
705}
706
707/// Target stat() handler.
708template <class OS>
709SyscallReturn
710statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
711 ThreadContext *tc)
712{
713 std::string path;
714
715 int index = 0;
716 if (!tc->getMemPort()->tryReadString(path,
717 process->getSyscallArg(tc, index))) {
718 return -EFAULT;
719 }
720 Addr bufPtr = process->getSyscallArg(tc, index);
721
722 // Adjust path for current working directory
723 path = process->fullPath(path);
724
725 struct stat hostBuf;
726 int result = stat(path.c_str(), &hostBuf);
727
728 if (result < 0)
729 return -errno;
730
731 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
732
733 return 0;
734}
735
736
737/// Target stat64() handler.
738template <class OS>
739SyscallReturn
740stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
741 ThreadContext *tc)
742{
743 std::string path;
744
745 int index = 0;
746 if (!tc->getMemPort()->tryReadString(path,
747 process->getSyscallArg(tc, index)))
748 return -EFAULT;
749 Addr bufPtr = process->getSyscallArg(tc, index);
750
751 // Adjust path for current working directory
752 path = process->fullPath(path);
753
754#if NO_STAT64
755 struct stat hostBuf;
756 int result = stat(path.c_str(), &hostBuf);
757#else
758 struct stat64 hostBuf;
759 int result = stat64(path.c_str(), &hostBuf);
760#endif
761
762 if (result < 0)
763 return -errno;
764
765 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
766
767 return 0;
768}
769
770
771/// Target fstat64() handler.
772template <class OS>
773SyscallReturn
774fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
775 ThreadContext *tc)
776{
777 int index = 0;
778 int fd = process->getSyscallArg(tc, index);
779 Addr bufPtr = process->getSyscallArg(tc, index);
780 if (fd < 0 || process->sim_fd(fd) < 0) {
781 // doesn't map to any simulator fd: not a valid target fd
782 return -EBADF;
783 }
784
785#if NO_STAT64
786 struct stat hostBuf;
787 int result = fstat(process->sim_fd(fd), &hostBuf);
788#else
789 struct stat64 hostBuf;
790 int result = fstat64(process->sim_fd(fd), &hostBuf);
791#endif
792
793 if (result < 0)
794 return -errno;
795
796 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
797
798 return 0;
799}
800
801
802/// Target lstat() handler.
803template <class OS>
804SyscallReturn
805lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
806 ThreadContext *tc)
807{
808 std::string path;
809
810 int index = 0;
811 if (!tc->getMemPort()->tryReadString(path,
812 process->getSyscallArg(tc, index))) {
813 return -EFAULT;
814 }
815 Addr bufPtr = process->getSyscallArg(tc, index);
816
817 // Adjust path for current working directory
818 path = process->fullPath(path);
819
820 struct stat hostBuf;
821 int result = lstat(path.c_str(), &hostBuf);
822
823 if (result < 0)
824 return -errno;
825
826 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
827
828 return 0;
829}
830
831/// Target lstat64() handler.
832template <class OS>
833SyscallReturn
834lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
835 ThreadContext *tc)
836{
837 std::string path;
838
839 int index = 0;
840 if (!tc->getMemPort()->tryReadString(path,
841 process->getSyscallArg(tc, index))) {
842 return -EFAULT;
843 }
844 Addr bufPtr = process->getSyscallArg(tc, index);
845
846 // Adjust path for current working directory
847 path = process->fullPath(path);
848
849#if NO_STAT64
850 struct stat hostBuf;
851 int result = lstat(path.c_str(), &hostBuf);
852#else
853 struct stat64 hostBuf;
854 int result = lstat64(path.c_str(), &hostBuf);
855#endif
856
857 if (result < 0)
858 return -errno;
859
860 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
861
862 return 0;
863}
864
865/// Target fstat() handler.
866template <class OS>
867SyscallReturn
868fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
869 ThreadContext *tc)
870{
871 int index = 0;
872 int fd = process->sim_fd(process->getSyscallArg(tc, index));
873 Addr bufPtr = process->getSyscallArg(tc, index);
874
875 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
876
877 if (fd < 0)
878 return -EBADF;
879
880 struct stat hostBuf;
881 int result = fstat(fd, &hostBuf);
882
883 if (result < 0)
884 return -errno;
885
886 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
887
888 return 0;
889}
890
891
892/// Target statfs() handler.
893template <class OS>
894SyscallReturn
895statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
896 ThreadContext *tc)
897{
898 std::string path;
899
900 int index = 0;
901 if (!tc->getMemPort()->tryReadString(path,
902 process->getSyscallArg(tc, index))) {
903 return -EFAULT;
904 }
905 Addr bufPtr = process->getSyscallArg(tc, index);
906
907 // Adjust path for current working directory
908 path = process->fullPath(path);
909
910 struct statfs hostBuf;
911 int result = statfs(path.c_str(), &hostBuf);
912
913 if (result < 0)
914 return -errno;
915
916 OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
917
918 return 0;
919}
920
921
922/// Target fstatfs() handler.
923template <class OS>
924SyscallReturn
925fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
926 ThreadContext *tc)
927{
928 int index = 0;
929 int fd = process->sim_fd(process->getSyscallArg(tc, index));
930 Addr bufPtr = process->getSyscallArg(tc, index);
931
932 if (fd < 0)
933 return -EBADF;
934
935 struct statfs hostBuf;
936 int result = fstatfs(fd, &hostBuf);
937
938 if (result < 0)
939 return -errno;
940
941 OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
942
943 return 0;
944}
945
946
947/// Target writev() handler.
948template <class OS>
949SyscallReturn
950writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
951 ThreadContext *tc)
952{
953 int index = 0;
954 int fd = process->getSyscallArg(tc, index);
955 if (fd < 0 || process->sim_fd(fd) < 0) {
956 // doesn't map to any simulator fd: not a valid target fd
957 return -EBADF;
958 }
959
960 TranslatingPort *p = tc->getMemPort();
961 uint64_t tiov_base = process->getSyscallArg(tc, index);
962 size_t count = process->getSyscallArg(tc, index);
963 struct iovec hiov[count];
964 for (size_t i = 0; i < count; ++i) {
965 typename OS::tgt_iovec tiov;
966
967 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
968 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
969 hiov[i].iov_len = gtoh(tiov.iov_len);
970 hiov[i].iov_base = new char [hiov[i].iov_len];
971 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
972 hiov[i].iov_len);
973 }
974
975 int result = writev(process->sim_fd(fd), hiov, count);
976
977 for (size_t i = 0; i < count; ++i)
978 delete [] (char *)hiov[i].iov_base;
979
980 if (result < 0)
981 return -errno;
982
983 return 0;
984}
985
986
987/// Target mmap() handler.
988///
989/// We don't really handle mmap(). If the target is mmaping an
990/// anonymous region or /dev/zero, we can get away with doing basically
991/// nothing (since memory is initialized to zero and the simulator
992/// doesn't really check addresses anyway). Always print a warning,
993/// since this could be seriously broken if we're not mapping
994/// /dev/zero.
995//
996/// Someday we should explicitly check for /dev/zero in open, flag the
997/// file descriptor, and fail (or implement!) a non-anonymous mmap to
998/// anything else.
999template <class OS>
1000SyscallReturn
1001mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1002{
1003 int index = 0;
1004 Addr start = p->getSyscallArg(tc, index);
1005 uint64_t length = p->getSyscallArg(tc, index);
1006 index++; // int prot = p->getSyscallArg(tc, index);
1007 int flags = p->getSyscallArg(tc, index);
1008 int fd = p->sim_fd(p->getSyscallArg(tc, index));
1009 // int offset = p->getSyscallArg(tc, index);
1010
1011
1012 if ((start % TheISA::VMPageSize) != 0 ||
1013 (length % TheISA::VMPageSize) != 0) {
1014 warn("mmap failing: arguments not page-aligned: "
1015 "start 0x%x length 0x%x",
1016 start, length);
1017 return -EINVAL;
1018 }
1019
1020 if (start != 0) {
1021 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
1022 start, p->mmap_end);
1023 }
1024
1025 // pick next address from our "mmap region"
1026 if (OS::mmapGrowsDown()) {
1027 start = p->mmap_end - length;
1028 p->mmap_end = start;
1029 } else {
1030 start = p->mmap_end;
1031 p->mmap_end += length;
1032 }
1033 p->pTable->allocate(start, length);
1034
1035 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1036 warn("allowing mmap of file @ fd %d. "
1037 "This will break if not /dev/zero.", fd);
1038 }
1039
1040 return start;
1041}
1042
1043/// Target getrlimit() handler.
1044template <class OS>
1045SyscallReturn
1046getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1047 ThreadContext *tc)
1048{
1049 int index = 0;
1050 unsigned resource = process->getSyscallArg(tc, index);
1051 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1052
1053 switch (resource) {
1054 case OS::TGT_RLIMIT_STACK:
1055 // max stack size in bytes: make up a number (8MB for now)
1056 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1057 rlp->rlim_cur = htog(rlp->rlim_cur);
1058 rlp->rlim_max = htog(rlp->rlim_max);
1059 break;
1060
1061 case OS::TGT_RLIMIT_DATA:
1062 // max data segment size in bytes: make up a number
1063 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1064 rlp->rlim_cur = htog(rlp->rlim_cur);
1065 rlp->rlim_max = htog(rlp->rlim_max);
1066 break;
1067
1068 default:
1069 std::cerr << "getrlimitFunc: unimplemented resource " << resource
1070 << std::endl;
1071 abort();
1072 break;
1073 }
1074
1075 rlp.copyOut(tc->getMemPort());
1076 return 0;
1077}
1078
1079/// Target gettimeofday() handler.
1080template <class OS>
1081SyscallReturn
1082gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1083 ThreadContext *tc)
1084{
1085 int index = 0;
1086 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1087
1088 getElapsedTime(tp->tv_sec, tp->tv_usec);
1089 tp->tv_sec += seconds_since_epoch;
1090 tp->tv_sec = TheISA::htog(tp->tv_sec);
1091 tp->tv_usec = TheISA::htog(tp->tv_usec);
1092
1093 tp.copyOut(tc->getMemPort());
1094
1095 return 0;
1096}
1097
1098
1099/// Target utimes() handler.
1100template <class OS>
1101SyscallReturn
1102utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1103 ThreadContext *tc)
1104{
1105 std::string path;
1106
1107 int index = 0;
1108 if (!tc->getMemPort()->tryReadString(path,
1109 process->getSyscallArg(tc, index))) {
1110 return -EFAULT;
1111 }
1112
1113 TypedBufferArg<typename OS::timeval [2]>
1114 tp(process->getSyscallArg(tc, index));
1115 tp.copyIn(tc->getMemPort());
1116
1117 struct timeval hostTimeval[2];
1118 for (int i = 0; i < 2; ++i)
1119 {
1120 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
1121 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
1122 }
1123
1124 // Adjust path for current working directory
1125 path = process->fullPath(path);
1126
1127 int result = utimes(path.c_str(), hostTimeval);
1128
1129 if (result < 0)
1130 return -errno;
1131
1132 return 0;
1133}
1134/// Target getrusage() function.
1135template <class OS>
1136SyscallReturn
1137getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1138 ThreadContext *tc)
1139{
1140 int index = 0;
1141 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1142 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1143
1144 rup->ru_utime.tv_sec = 0;
1145 rup->ru_utime.tv_usec = 0;
1146 rup->ru_stime.tv_sec = 0;
1147 rup->ru_stime.tv_usec = 0;
1148 rup->ru_maxrss = 0;
1149 rup->ru_ixrss = 0;
1150 rup->ru_idrss = 0;
1151 rup->ru_isrss = 0;
1152 rup->ru_minflt = 0;
1153 rup->ru_majflt = 0;
1154 rup->ru_nswap = 0;
1155 rup->ru_inblock = 0;
1156 rup->ru_oublock = 0;
1157 rup->ru_msgsnd = 0;
1158 rup->ru_msgrcv = 0;
1159 rup->ru_nsignals = 0;
1160 rup->ru_nvcsw = 0;
1161 rup->ru_nivcsw = 0;
1162
1163 switch (who) {
1164 case OS::TGT_RUSAGE_SELF:
1165 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1166 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1167 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1168 break;
1169
1170 case OS::TGT_RUSAGE_CHILDREN:
1171 // do nothing. We have no child processes, so they take no time.
1172 break;
1173
1174 default:
1175 // don't really handle THREAD or CHILDREN, but just warn and
1176 // plow ahead
1177 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1178 who);
1179 }
1180
1181 rup.copyOut(tc->getMemPort());
1182
1183 return 0;
1184}
1185
1186/// Target times() function.
1187template <class OS>
1188SyscallReturn
1189timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1190 ThreadContext *tc)
1191{
1192 int index = 0;
1193 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1194
1195 // Fill in the time structure (in clocks)
1196 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1197 bufp->tms_utime = clocks;
1198 bufp->tms_stime = 0;
1199 bufp->tms_cutime = 0;
1200 bufp->tms_cstime = 0;
1201
1202 // Convert to host endianness
1203 bufp->tms_utime = htog(bufp->tms_utime);
1204
1205 // Write back
1206 bufp.copyOut(tc->getMemPort());
1207
1208 // Return clock ticks since system boot
1209 return clocks;
1210}
1211
1212/// Target time() function.
1213template <class OS>
1214SyscallReturn
1215timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1216 ThreadContext *tc)
1217{
1218 typename OS::time_t sec, usec;
1219 getElapsedTime(sec, usec);
1220 sec += seconds_since_epoch;
1221
1222 int index = 0;
1223 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1224 if(taddr != 0) {
1225 typename OS::time_t t = sec;
1226 t = htog(t);
1227 TranslatingPort *p = tc->getMemPort();
1228 p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1229 }
1230 return sec;
1231}
1232
1233
1234#endif // __SIM_SYSCALL_EMUL_HH__
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