1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 * Kevin Lim
30 */
31
32#ifndef __SIM_SYSCALL_EMUL_HH__
33#define __SIM_SYSCALL_EMUL_HH__
34
35#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
36 defined(__FreeBSD__) || defined(__CYGWIN__))
37
38///
39/// @file syscall_emul.hh
40///
41/// This file defines objects used to emulate syscalls from the target
42/// application on the host machine.
43
44#include <errno.h>
45#include <string>
46#ifdef __CYGWIN32__
47#include <sys/fcntl.h> // for O_BINARY
48#endif
49#include <sys/stat.h>
50#include <fcntl.h>
51#include <sys/uio.h>
52
53#include "sim/host.hh" // for Addr
54#include "base/chunk_generator.hh"
55#include "base/intmath.hh" // for RoundUp
56#include "base/misc.hh"
57#include "base/trace.hh"
58#include "cpu/base.hh"
59#include "cpu/thread_context.hh"
60#include "mem/translating_port.hh"
61#include "mem/page_table.hh"
62#include "sim/process.hh"
63
64///
65/// System call descriptor.
66///
67class SyscallDesc {
68
69 public:
70
71 /// Typedef for target syscall handler functions.
72 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
73 LiveProcess *, ThreadContext *);
74
75 const char *name; //!< Syscall name (e.g., "open").
76 FuncPtr funcPtr; //!< Pointer to emulation function.
77 int flags; //!< Flags (see Flags enum).
78
79 /// Flag values for controlling syscall behavior.
80 enum Flags {
81 /// Don't set return regs according to funcPtr return value.
82 /// Used for syscalls with non-standard return conventions
83 /// that explicitly set the ThreadContext regs (e.g.,
84 /// sigreturn).
85 SuppressReturnValue = 1
86 };
87
88 /// Constructor.
89 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
90 : name(_name), funcPtr(_funcPtr), flags(_flags)
91 {
92 }
93
94 /// Emulate the syscall. Public interface for calling through funcPtr.
95 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
96};
97
98
99class BaseBufferArg {
100
101 public:
102
103 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
104 {
105 bufPtr = new uint8_t[size];
106 // clear out buffer: in case we only partially populate this,
107 // and then do a copyOut(), we want to make sure we don't
108 // introduce any random junk into the simulated address space
109 memset(bufPtr, 0, size);
110 }
111
112 virtual ~BaseBufferArg() { delete [] bufPtr; }
113
114 //
115 // copy data into simulator space (read from target memory)
116 //
117 virtual bool copyIn(TranslatingPort *memport)
118 {
119 memport->readBlob(addr, bufPtr, size);
120 return true; // no EFAULT detection for now
121 }
122
123 //
124 // copy data out of simulator space (write to target memory)
125 //
126 virtual bool copyOut(TranslatingPort *memport)
127 {
128 memport->writeBlob(addr, bufPtr, size);
129 return true; // no EFAULT detection for now
130 }
131
132 protected:
133 Addr addr;
134 int size;
135 uint8_t *bufPtr;
136};
137
138
139class BufferArg : public BaseBufferArg
140{
141 public:
142 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
143 void *bufferPtr() { return bufPtr; }
144};
145
146template <class T>
147class TypedBufferArg : public BaseBufferArg
148{
149 public:
150 // user can optionally specify a specific number of bytes to
151 // allocate to deal with those structs that have variable-size
152 // arrays at the end
153 TypedBufferArg(Addr _addr, int _size = sizeof(T))
154 : BaseBufferArg(_addr, _size)
155 { }
156
157 // type case
158 operator T*() { return (T *)bufPtr; }
159
160 // dereference operators
161 T &operator*() { return *((T *)bufPtr); }
162 T* operator->() { return (T *)bufPtr; }
163 T &operator[](int i) { return ((T *)bufPtr)[i]; }
164};
165
166//////////////////////////////////////////////////////////////////////
167//
168// The following emulation functions are generic enough that they
169// don't need to be recompiled for different emulated OS's. They are
170// defined in sim/syscall_emul.cc.
171//
172//////////////////////////////////////////////////////////////////////
173
174
175/// Handler for unimplemented syscalls that we haven't thought about.
176SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
177 LiveProcess *p, ThreadContext *tc);
178
179/// Handler for unimplemented syscalls that we never intend to
180/// implement (signal handling, etc.) and should not affect the correct
181/// behavior of the program. Print a warning only if the appropriate
182/// trace flag is enabled. Return success to the target program.
183SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
184 LiveProcess *p, ThreadContext *tc);
185
186/// Target exit() handler: terminate current context.
187SyscallReturn exitFunc(SyscallDesc *desc, int num,
188 LiveProcess *p, ThreadContext *tc);
189
190/// Target exit_group() handler: terminate simulation. (exit all threads)
191SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
192 LiveProcess *p, ThreadContext *tc);
193
194/// Target getpagesize() handler.
195SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
196 LiveProcess *p, ThreadContext *tc);
197
198/// Target brk() handler: set brk address.
199SyscallReturn brkFunc(SyscallDesc *desc, int num,
200 LiveProcess *p, ThreadContext *tc);
201
202/// Target close() handler.
203SyscallReturn closeFunc(SyscallDesc *desc, int num,
204 LiveProcess *p, ThreadContext *tc);
205
206/// Target read() handler.
207SyscallReturn readFunc(SyscallDesc *desc, int num,
208 LiveProcess *p, ThreadContext *tc);
209
210/// Target write() handler.
211SyscallReturn writeFunc(SyscallDesc *desc, int num,
212 LiveProcess *p, ThreadContext *tc);
213
214/// Target lseek() handler.
215SyscallReturn lseekFunc(SyscallDesc *desc, int num,
216 LiveProcess *p, ThreadContext *tc);
217
218/// Target _llseek() handler.
219SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
220 LiveProcess *p, ThreadContext *tc);
221
222/// Target munmap() handler.
223SyscallReturn munmapFunc(SyscallDesc *desc, int num,
224 LiveProcess *p, ThreadContext *tc);
225
226/// Target gethostname() handler.
227SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
228 LiveProcess *p, ThreadContext *tc);
229
230/// Target getcwd() handler.
231SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
232 LiveProcess *p, ThreadContext *tc);
233
234/// Target unlink() handler.
235SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
236 LiveProcess *p, ThreadContext *tc);
237
238/// Target unlink() handler.
239SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
240 LiveProcess *p, ThreadContext *tc);
241
242/// Target mkdir() handler.
243SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
244 LiveProcess *p, ThreadContext *tc);
245
246/// Target rename() handler.
247SyscallReturn renameFunc(SyscallDesc *desc, int num,
248 LiveProcess *p, ThreadContext *tc);
249
250
251/// Target truncate() handler.
252SyscallReturn truncateFunc(SyscallDesc *desc, int num,
253 LiveProcess *p, ThreadContext *tc);
254
255
256/// Target ftruncate() handler.
257SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
258 LiveProcess *p, ThreadContext *tc);
259
260
261/// Target umask() handler.
262SyscallReturn umaskFunc(SyscallDesc *desc, int num,
263 LiveProcess *p, ThreadContext *tc);
264
265
266/// Target chown() handler.
267SyscallReturn chownFunc(SyscallDesc *desc, int num,
268 LiveProcess *p, ThreadContext *tc);
269
270
271/// Target fchown() handler.
272SyscallReturn fchownFunc(SyscallDesc *desc, int num,
273 LiveProcess *p, ThreadContext *tc);
274
275/// Target dup() handler.
276SyscallReturn dupFunc(SyscallDesc *desc, int num,
277 LiveProcess *process, ThreadContext *tc);
278
279/// Target fnctl() handler.
280SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
281 LiveProcess *process, ThreadContext *tc);
282
283/// Target fcntl64() handler.
284SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
285 LiveProcess *process, ThreadContext *tc);
286
287/// Target setuid() handler.
288SyscallReturn setuidFunc(SyscallDesc *desc, int num,
289 LiveProcess *p, ThreadContext *tc);
290
291/// Target getpid() handler.
292SyscallReturn getpidFunc(SyscallDesc *desc, int num,
293 LiveProcess *p, ThreadContext *tc);
294
295/// Target getuid() handler.
296SyscallReturn getuidFunc(SyscallDesc *desc, int num,
297 LiveProcess *p, ThreadContext *tc);
298
299/// Target getgid() handler.
300SyscallReturn getgidFunc(SyscallDesc *desc, int num,
301 LiveProcess *p, ThreadContext *tc);
302
303/// Target getppid() handler.
304SyscallReturn getppidFunc(SyscallDesc *desc, int num,
305 LiveProcess *p, ThreadContext *tc);
306
307/// Target geteuid() handler.
308SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
309 LiveProcess *p, ThreadContext *tc);
310
311/// Target getegid() handler.
312SyscallReturn getegidFunc(SyscallDesc *desc, int num,
313 LiveProcess *p, ThreadContext *tc);
314
315/// Target clone() handler.
316SyscallReturn cloneFunc(SyscallDesc *desc, int num,
317 LiveProcess *p, ThreadContext *tc);
318
319
320/// Pseudo Funcs - These functions use a different return convension,
321/// returning a second value in a register other than the normal return register
322SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
323 LiveProcess *process, ThreadContext *tc);
324
325/// Target getpidPseudo() handler.
326SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
327 LiveProcess *p, ThreadContext *tc);
328
329/// Target getuidPseudo() handler.
330SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
331 LiveProcess *p, ThreadContext *tc);
332
333/// Target getgidPseudo() handler.
334SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
335 LiveProcess *p, ThreadContext *tc);
336
337
338/// A readable name for 1,000,000, for converting microseconds to seconds.
339const int one_million = 1000000;
340
341/// Approximate seconds since the epoch (1/1/1970). About a billion,
342/// by my reckoning. We want to keep this a constant (not use the
343/// real-world time) to keep simulations repeatable.
344const unsigned seconds_since_epoch = 1000000000;
345
346/// Helper function to convert current elapsed time to seconds and
347/// microseconds.
348template <class T1, class T2>
349void
350getElapsedTime(T1 &sec, T2 &usec)
351{
352 int elapsed_usecs = curTick / Clock::Int::us;
353 sec = elapsed_usecs / one_million;
354 usec = elapsed_usecs % one_million;
355}
356
357//////////////////////////////////////////////////////////////////////
358//
359// The following emulation functions are generic, but need to be
360// templated to account for differences in types, constants, etc.
361//
362//////////////////////////////////////////////////////////////////////
363
364#if NO_STAT64
365 typedef struct stat hst_stat;
366 typedef struct stat hst_stat64;
367#else
368 typedef struct stat hst_stat;
369 typedef struct stat64 hst_stat64;
370#endif
371
372//// Helper function to convert a host stat buffer to a target stat
373//// buffer. Also copies the target buffer out to the simulated
374//// memory space. Used by stat(), fstat(), and lstat().
375
376template <typename target_stat, typename host_stat>
377static void
378convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
379{
380 using namespace TheISA;
381
382 if (fakeTTY)
383 tgt->st_dev = 0xA;
384 else
385 tgt->st_dev = host->st_dev;
386 tgt->st_dev = htog(tgt->st_dev);
387 tgt->st_ino = host->st_ino;
388 tgt->st_ino = htog(tgt->st_ino);
389 tgt->st_mode = host->st_mode;
390 if (fakeTTY) {
391 // Claim to be a character device
392 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
393 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
394 }
395 tgt->st_mode = htog(tgt->st_mode);
396 tgt->st_nlink = host->st_nlink;
397 tgt->st_nlink = htog(tgt->st_nlink);
398 tgt->st_uid = host->st_uid;
399 tgt->st_uid = htog(tgt->st_uid);
400 tgt->st_gid = host->st_gid;
401 tgt->st_gid = htog(tgt->st_gid);
402 if (fakeTTY)
403 tgt->st_rdev = 0x880d;
404 else
405 tgt->st_rdev = host->st_rdev;
406 tgt->st_rdev = htog(tgt->st_rdev);
407 tgt->st_size = host->st_size;
408 tgt->st_size = htog(tgt->st_size);
409 tgt->st_atimeX = host->st_atime;
410 tgt->st_atimeX = htog(tgt->st_atimeX);
411 tgt->st_mtimeX = host->st_mtime;
412 tgt->st_mtimeX = htog(tgt->st_mtimeX);
413 tgt->st_ctimeX = host->st_ctime;
414 tgt->st_ctimeX = htog(tgt->st_ctimeX);
415 // Force the block size to be 8k. This helps to ensure buffered io works
416 // consistently across different hosts.
417 tgt->st_blksize = 0x2000;
418 tgt->st_blksize = htog(tgt->st_blksize);
419 tgt->st_blocks = host->st_blocks;
420 tgt->st_blocks = htog(tgt->st_blocks);
421}
422
423// Same for stat64
424
425template <typename target_stat, typename host_stat64>
426static void
427convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
428{
429 using namespace TheISA;
430
431 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
432#if defined(STAT_HAVE_NSEC)
433 tgt->st_atime_nsec = host->st_atime_nsec;
434 tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
435 tgt->st_mtime_nsec = host->st_mtime_nsec;
436 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
437 tgt->st_ctime_nsec = host->st_ctime_nsec;
438 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
439#else
440 tgt->st_atime_nsec = 0;
441 tgt->st_mtime_nsec = 0;
442 tgt->st_ctime_nsec = 0;
443#endif
444}
445
446//Here are a couple convenience functions
447template<class OS>
448static void
449copyOutStatBuf(TranslatingPort * mem, Addr addr,
450 hst_stat *host, bool fakeTTY = false)
451{
452 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
453 tgt_stat_buf tgt(addr);
454 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
455 tgt.copyOut(mem);
456}
457
458template<class OS>
459static void
460copyOutStat64Buf(TranslatingPort * mem, Addr addr,
461 hst_stat64 *host, bool fakeTTY = false)
462{
463 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
464 tgt_stat_buf tgt(addr);
465 convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
466 tgt.copyOut(mem);
467}
468
469/// Target ioctl() handler. For the most part, programs call ioctl()
470/// only to find out if their stdout is a tty, to determine whether to
471/// do line or block buffering.
472template <class OS>
473SyscallReturn
474ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
475 ThreadContext *tc)
476{
477 int fd = process->getSyscallArg(tc, 0);
478 unsigned req = process->getSyscallArg(tc, 1);
479
480 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
481
482 if (fd < 0 || process->sim_fd(fd) < 0) {
483 // doesn't map to any simulator fd: not a valid target fd
484 return -EBADF;
485 }
486
487 switch (req) {
488 case OS::TIOCISATTY_:
489 case OS::TIOCGETP_:
490 case OS::TIOCSETP_:
491 case OS::TIOCSETN_:
492 case OS::TIOCSETC_:
493 case OS::TIOCGETC_:
494 case OS::TIOCGETS_:
495 case OS::TIOCGETA_:
496 return -ENOTTY;
497
498 default:
499 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
500 fd, req, tc->readPC());
501 }
502}
503
504/// Target open() handler.
505template <class OS>
506SyscallReturn
507openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
508 ThreadContext *tc)
509{
510 std::string path;
511
512 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
513 return -EFAULT;
514
515 if (path == "/dev/sysdev0") {
516 // This is a memory-mapped high-resolution timer device on Alpha.
517 // We don't support it, so just punt.
518 warn("Ignoring open(%s, ...)\n", path);
519 return -ENOENT;
520 }
521
522 int tgtFlags = process->getSyscallArg(tc, 1);
523 int mode = process->getSyscallArg(tc, 2);
524 int hostFlags = 0;
525
526 // translate open flags
527 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
528 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
529 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
530 hostFlags |= OS::openFlagTable[i].hostFlag;
531 }
532 }
533
534 // any target flags left?
535 if (tgtFlags != 0)
536 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
537
538#ifdef __CYGWIN32__
539 hostFlags |= O_BINARY;
540#endif
541
542 // Adjust path for current working directory
543 path = process->fullPath(path);
544
545 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
546
547 int fd;
548 if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
549 !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
550 // It's a proc/sys entery and requires special handling
551 fd = OS::openSpecialFile(path, process, tc);
552 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
553 } else {
554 // open the file
555 fd = open(path.c_str(), hostFlags, mode);
556 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
557 }
558
559}
560
561
562/// Target chmod() handler.
563template <class OS>
564SyscallReturn
565chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
566 ThreadContext *tc)
567{
568 std::string path;
569
570 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
571 return -EFAULT;
572
573 uint32_t mode = process->getSyscallArg(tc, 1);
574 mode_t hostMode = 0;
575
576 // XXX translate mode flags via OS::something???
577 hostMode = mode;
578
579 // Adjust path for current working directory
580 path = process->fullPath(path);
581
582 // do the chmod
583 int result = chmod(path.c_str(), hostMode);
584 if (result < 0)
585 return -errno;
586
587 return 0;
588}
589
590
591/// Target fchmod() handler.
592template <class OS>
593SyscallReturn
594fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
595 ThreadContext *tc)
596{
597 int fd = process->getSyscallArg(tc, 0);
598 if (fd < 0 || process->sim_fd(fd) < 0) {
599 // doesn't map to any simulator fd: not a valid target fd
600 return -EBADF;
601 }
602
603 uint32_t mode = process->getSyscallArg(tc, 1);
604 mode_t hostMode = 0;
605
606 // XXX translate mode flags via OS::someting???
607 hostMode = mode;
608
609 // do the fchmod
610 int result = fchmod(process->sim_fd(fd), hostMode);
611 if (result < 0)
612 return -errno;
613
614 return 0;
615}
616
617/// Target mremap() handler.
618template <class OS>
619SyscallReturn
620mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
621{
622 Addr start = process->getSyscallArg(tc, 0);
623 uint64_t old_length = process->getSyscallArg(tc, 1);
624 uint64_t new_length = process->getSyscallArg(tc, 2);
625 uint64_t flags = process->getSyscallArg(tc, 3);
626
627 if ((start % TheISA::VMPageSize != 0) ||
628 (new_length % TheISA::VMPageSize != 0)) {
629 warn("mremap failing: arguments not page aligned");
630 return -EINVAL;
631 }
632
633 if (new_length > old_length) {
634 if ((start + old_length) == process->mmap_end) {
635 uint64_t diff = new_length - old_length;
636 process->pTable->allocate(process->mmap_end, diff);
637 process->mmap_end += diff;
638 return start;
639 } else {
640 // sys/mman.h defined MREMAP_MAYMOVE
641 if (!(flags & 1)) {
642 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
643 return -ENOMEM;
644 } else {
645 process->pTable->remap(start, old_length, process->mmap_end);
646 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
647 process->mmap_end, process->mmap_end + new_length, new_length);
648 start = process->mmap_end;
649 // add on the remaining unallocated pages
650 process->pTable->allocate(start + old_length, new_length - old_length);
651 process->mmap_end += new_length;
652 warn("returning %08p as start\n", start);
653 return start;
654 }
655 }
656 } else {
657 process->pTable->deallocate(start + new_length, old_length -
658 new_length);
659 return start;
660 }
661}
662
663/// Target stat() handler.
664template <class OS>
665SyscallReturn
666statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
667 ThreadContext *tc)
668{
669 std::string path;
670
671 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
672 return -EFAULT;
673
674 // Adjust path for current working directory
675 path = process->fullPath(path);
676
677 struct stat hostBuf;
678 int result = stat(path.c_str(), &hostBuf);
679
680 if (result < 0)
681 return -errno;
682
683 copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
684 &hostBuf);
685
686 return 0;
687}
688
689
690/// Target stat64() handler.
691template <class OS>
692SyscallReturn
693stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
694 ThreadContext *tc)
695{
696 std::string path;
697
698 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
699 return -EFAULT;
700
701 // Adjust path for current working directory
702 path = process->fullPath(path);
703
704#if NO_STAT64
705 struct stat hostBuf;
706 int result = stat(path.c_str(), &hostBuf);
707#else
708 struct stat64 hostBuf;
709 int result = stat64(path.c_str(), &hostBuf);
710#endif
711
712 if (result < 0)
713 return -errno;
714
715 copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
716 &hostBuf);
717
718 return 0;
719}
720
721
722/// Target fstat64() handler.
723template <class OS>
724SyscallReturn
725fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
726 ThreadContext *tc)
727{
728 int fd = process->getSyscallArg(tc, 0);
729 if (fd < 0 || process->sim_fd(fd) < 0) {
730 // doesn't map to any simulator fd: not a valid target fd
731 return -EBADF;
732 }
733
734#if NO_STAT64
735 struct stat hostBuf;
736 int result = fstat(process->sim_fd(fd), &hostBuf);
737#else
738 struct stat64 hostBuf;
739 int result = fstat64(process->sim_fd(fd), &hostBuf);
740#endif
741
742 if (result < 0)
743 return -errno;
744
745 copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
746 &hostBuf, (fd == 1));
747
748 return 0;
749}
750
751
752/// Target lstat() handler.
753template <class OS>
754SyscallReturn
755lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
756 ThreadContext *tc)
757{
758 std::string path;
759
760 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
761 return -EFAULT;
762
763 // Adjust path for current working directory
764 path = process->fullPath(path);
765
766 struct stat hostBuf;
767 int result = lstat(path.c_str(), &hostBuf);
768
769 if (result < 0)
770 return -errno;
771
772 copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
773 &hostBuf);
774
775 return 0;
776}
777
778/// Target lstat64() handler.
779template <class OS>
780SyscallReturn
781lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
782 ThreadContext *tc)
783{
784 std::string path;
785
786 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
787 return -EFAULT;
788
789 // Adjust path for current working directory
790 path = process->fullPath(path);
791
792#if NO_STAT64
793 struct stat hostBuf;
794 int result = lstat(path.c_str(), &hostBuf);
795#else
796 struct stat64 hostBuf;
797 int result = lstat64(path.c_str(), &hostBuf);
798#endif
799
800 if (result < 0)
801 return -errno;
802
803 copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
804 &hostBuf);
805
806 return 0;
807}
808
809/// Target fstat() handler.
810template <class OS>
811SyscallReturn
812fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
813 ThreadContext *tc)
814{
815 int fd = process->sim_fd(process->getSyscallArg(tc, 0));
816
817 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
818
819 if (fd < 0)
820 return -EBADF;
821
822 struct stat hostBuf;
823 int result = fstat(fd, &hostBuf);
824
825 if (result < 0)
826 return -errno;
827
828 copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
829 &hostBuf, (fd == 1));
830
831 return 0;
832}
833
834
835/// Target statfs() handler.
836template <class OS>
837SyscallReturn
838statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
839 ThreadContext *tc)
840{
841 std::string path;
842
843 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
844 return -EFAULT;
845
846 // Adjust path for current working directory
847 path = process->fullPath(path);
848
849 struct statfs hostBuf;
850 int result = statfs(path.c_str(), &hostBuf);
851
852 if (result < 0)
853 return -errno;
854
855 OS::copyOutStatfsBuf(tc->getMemPort(),
856 (Addr)(process->getSyscallArg(tc, 1)), &hostBuf);
857
858 return 0;
859}
860
861
862/// Target fstatfs() handler.
863template <class OS>
864SyscallReturn
865fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
866 ThreadContext *tc)
867{
868 int fd = process->sim_fd(process->getSyscallArg(tc, 0));
869
870 if (fd < 0)
871 return -EBADF;
872
873 struct statfs hostBuf;
874 int result = fstatfs(fd, &hostBuf);
875
876 if (result < 0)
877 return -errno;
878
879 OS::copyOutStatfsBuf(tc->getMemPort(), process->getSyscallArg(tc, 1),
880 &hostBuf);
881
882 return 0;
883}
884
885
886/// Target writev() handler.
887template <class OS>
888SyscallReturn
889writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
890 ThreadContext *tc)
891{
892 int fd = process->getSyscallArg(tc, 0);
893 if (fd < 0 || process->sim_fd(fd) < 0) {
894 // doesn't map to any simulator fd: not a valid target fd
895 return -EBADF;
896 }
897
898 TranslatingPort *p = tc->getMemPort();
899 uint64_t tiov_base = process->getSyscallArg(tc, 1);
900 size_t count = process->getSyscallArg(tc, 2);
901 struct iovec hiov[count];
902 for (int i = 0; i < count; ++i)
903 {
904 typename OS::tgt_iovec tiov;
905
906 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
907 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
908 hiov[i].iov_len = gtoh(tiov.iov_len);
909 hiov[i].iov_base = new char [hiov[i].iov_len];
910 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
911 hiov[i].iov_len);
912 }
913
914 int result = writev(process->sim_fd(fd), hiov, count);
915
916 for (int i = 0; i < count; ++i)
917 {
918 delete [] (char *)hiov[i].iov_base;
919 }
920
921 if (result < 0)
922 return -errno;
923
924 return 0;
925}
926
927
928/// Target mmap() handler.
929///
930/// We don't really handle mmap(). If the target is mmaping an
931/// anonymous region or /dev/zero, we can get away with doing basically
932/// nothing (since memory is initialized to zero and the simulator
933/// doesn't really check addresses anyway). Always print a warning,
934/// since this could be seriously broken if we're not mapping
935/// /dev/zero.
936//
937/// Someday we should explicitly check for /dev/zero in open, flag the
938/// file descriptor, and fail (or implement!) a non-anonymous mmap to
939/// anything else.
940template <class OS>
941SyscallReturn
942mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
943{
944 Addr start = p->getSyscallArg(tc, 0);
945 uint64_t length = p->getSyscallArg(tc, 1);
946 // int prot = p->getSyscallArg(tc, 2);
947 int flags = p->getSyscallArg(tc, 3);
948 // int fd = p->sim_fd(p->getSyscallArg(tc, 4));
949 // int offset = p->getSyscallArg(tc, 5);
950
951
952 if ((start % TheISA::VMPageSize) != 0 ||
953 (length % TheISA::VMPageSize) != 0) {
954 warn("mmap failing: arguments not page-aligned: "
955 "start 0x%x length 0x%x",
956 start, length);
957 return -EINVAL;
958 }
959
960 if (start != 0) {
961 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
962 start, p->mmap_end);
963 }
964
965 // pick next address from our "mmap region"
966 start = p->mmap_end;
967 p->pTable->allocate(start, length);
968 p->mmap_end += length;
969
970 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
971 warn("allowing mmap of file @ fd %d. "
972 "This will break if not /dev/zero.", p->getSyscallArg(tc, 4));
973 }
974
975 return start;
976}
977
978/// Target getrlimit() handler.
979template <class OS>
980SyscallReturn
981getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
982 ThreadContext *tc)
983{
984 unsigned resource = process->getSyscallArg(tc, 0);
985 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, 1));
986
987 switch (resource) {
988 case OS::TGT_RLIMIT_STACK:
989 // max stack size in bytes: make up a number (8MB for now)
990 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
991 rlp->rlim_cur = htog(rlp->rlim_cur);
992 rlp->rlim_max = htog(rlp->rlim_max);
993 break;
994
995 case OS::TGT_RLIMIT_DATA:
996 // max data segment size in bytes: make up a number
997 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
998 rlp->rlim_cur = htog(rlp->rlim_cur);
999 rlp->rlim_max = htog(rlp->rlim_max);
1000 break;
1001
1002 default:
1003 std::cerr << "getrlimitFunc: unimplemented resource " << resource
1004 << std::endl;
1005 abort();
1006 break;
1007 }
1008
1009 rlp.copyOut(tc->getMemPort());
1010 return 0;
1011}
1012
1013/// Target gettimeofday() handler.
1014template <class OS>
1015SyscallReturn
1016gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1017 ThreadContext *tc)
1018{
1019 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, 0));
1020
1021 getElapsedTime(tp->tv_sec, tp->tv_usec);
1022 tp->tv_sec += seconds_since_epoch;
1023 tp->tv_sec = TheISA::htog(tp->tv_sec);
1024 tp->tv_usec = TheISA::htog(tp->tv_usec);
1025
1026 tp.copyOut(tc->getMemPort());
1027
1028 return 0;
1029}
1030
1031
1032/// Target utimes() handler.
1033template <class OS>
1034SyscallReturn
1035utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1036 ThreadContext *tc)
1037{
1038 std::string path;
1039
1040 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
1041 return -EFAULT;
1042
1043 TypedBufferArg<typename OS::timeval [2]> tp(process->getSyscallArg(tc, 1));
1044 tp.copyIn(tc->getMemPort());
1045
1046 struct timeval hostTimeval[2];
1047 for (int i = 0; i < 2; ++i)
1048 {
1049 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
1050 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
1051 }
1052
1053 // Adjust path for current working directory
1054 path = process->fullPath(path);
1055
1056 int result = utimes(path.c_str(), hostTimeval);
1057
1058 if (result < 0)
1059 return -errno;
1060
1061 return 0;
1062}
1063/// Target getrusage() function.
1064template <class OS>
1065SyscallReturn
1066getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1067 ThreadContext *tc)
1068{
1069 int who = process->getSyscallArg(tc, 0); // THREAD, SELF, or CHILDREN
1070 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, 1));
1071
1072 rup->ru_utime.tv_sec = 0;
1073 rup->ru_utime.tv_usec = 0;
1074 rup->ru_stime.tv_sec = 0;
1075 rup->ru_stime.tv_usec = 0;
1076 rup->ru_maxrss = 0;
1077 rup->ru_ixrss = 0;
1078 rup->ru_idrss = 0;
1079 rup->ru_isrss = 0;
1080 rup->ru_minflt = 0;
1081 rup->ru_majflt = 0;
1082 rup->ru_nswap = 0;
1083 rup->ru_inblock = 0;
1084 rup->ru_oublock = 0;
1085 rup->ru_msgsnd = 0;
1086 rup->ru_msgrcv = 0;
1087 rup->ru_nsignals = 0;
1088 rup->ru_nvcsw = 0;
1089 rup->ru_nivcsw = 0;
1090
1091 switch (who) {
1092 case OS::TGT_RUSAGE_SELF:
1093 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1094 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1095 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1096 break;
1097
1098 case OS::TGT_RUSAGE_CHILDREN:
1099 // do nothing. We have no child processes, so they take no time.
1100 break;
1101
1102 default:
1103 // don't really handle THREAD or CHILDREN, but just warn and
1104 // plow ahead
1105 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1106 who);
1107 }
1108
1109 rup.copyOut(tc->getMemPort());
1110
1111 return 0;
1112}
1113
1114
1115
1116
1117#endif // __SIM_SYSCALL_EMUL_HH__