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#ifdef __CYGWIN32__
45#include <sys/fcntl.h> // for O_BINARY
46#endif
47#include <sys/stat.h>
48#include <sys/time.h>
49#include <sys/uio.h>
50#include <fcntl.h>
51
52#include <cerrno>
53#include <string>
54
55#include "base/chunk_generator.hh"
56#include "base/intmath.hh" // for RoundUp
57#include "base/misc.hh"
58#include "base/trace.hh"
59#include "base/types.hh"
60#include "config/the_isa.hh"
61#include "cpu/base.hh"
62#include "cpu/thread_context.hh"
63#include "debug/SyscallVerbose.hh"
64#include "mem/page_table.hh"
65#include "mem/se_translating_port_proxy.hh"
66#include "sim/byteswap.hh"
67#include "sim/process.hh"
68#include "sim/syscallreturn.hh"
69#include "sim/system.hh"
70
71///
72/// System call descriptor.
73///
74class SyscallDesc {
75
76 public:
77
78 /// Typedef for target syscall handler functions.
79 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
80 LiveProcess *, ThreadContext *);
81
82 const char *name; //!< Syscall name (e.g., "open").
83 FuncPtr funcPtr; //!< Pointer to emulation function.
84 int flags; //!< Flags (see Flags enum).
85
86 /// Flag values for controlling syscall behavior.
87 enum Flags {
88 /// Don't set return regs according to funcPtr return value.
89 /// Used for syscalls with non-standard return conventions
90 /// that explicitly set the ThreadContext regs (e.g.,
91 /// sigreturn).
92 SuppressReturnValue = 1
93 };
94
95 /// Constructor.
96 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
97 : name(_name), funcPtr(_funcPtr), flags(_flags)
98 {
99 }
100
101 /// Emulate the syscall. Public interface for calling through funcPtr.
102 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
103};
104
105
106class BaseBufferArg {
107
108 public:
109
110 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
111 {
112 bufPtr = new uint8_t[size];
113 // clear out buffer: in case we only partially populate this,
114 // and then do a copyOut(), we want to make sure we don't
115 // introduce any random junk into the simulated address space
116 memset(bufPtr, 0, size);
117 }
118
119 virtual ~BaseBufferArg() { delete [] bufPtr; }
120
121 //
122 // copy data into simulator space (read from target memory)
123 //
124 virtual bool copyIn(SETranslatingPortProxy &memproxy)
125 {
126 memproxy.readBlob(addr, bufPtr, size);
127 return true; // no EFAULT detection for now
128 }
129
130 //
131 // copy data out of simulator space (write to target memory)
132 //
133 virtual bool copyOut(SETranslatingPortProxy &memproxy)
134 {
135 memproxy.writeBlob(addr, bufPtr, size);
136 return true; // no EFAULT detection for now
137 }
138
139 protected:
140 Addr addr;
141 int size;
142 uint8_t *bufPtr;
143};
144
145
146class BufferArg : public BaseBufferArg
147{
148 public:
149 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
150 void *bufferPtr() { return bufPtr; }
151};
152
153template <class T>
154class TypedBufferArg : public BaseBufferArg
155{
156 public:
157 // user can optionally specify a specific number of bytes to
158 // allocate to deal with those structs that have variable-size
159 // arrays at the end
160 TypedBufferArg(Addr _addr, int _size = sizeof(T))
161 : BaseBufferArg(_addr, _size)
162 { }
163
164 // type case
165 operator T*() { return (T *)bufPtr; }
166
167 // dereference operators
168 T &operator*() { return *((T *)bufPtr); }
169 T* operator->() { return (T *)bufPtr; }
170 T &operator[](int i) { return ((T *)bufPtr)[i]; }
171};
172
173//////////////////////////////////////////////////////////////////////
174//
175// The following emulation functions are generic enough that they
176// don't need to be recompiled for different emulated OS's. They are
177// defined in sim/syscall_emul.cc.
178//
179//////////////////////////////////////////////////////////////////////
180
181
182/// Handler for unimplemented syscalls that we haven't thought about.
183SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
184 LiveProcess *p, ThreadContext *tc);
185
186/// Handler for unimplemented syscalls that we never intend to
187/// implement (signal handling, etc.) and should not affect the correct
188/// behavior of the program. Print a warning only if the appropriate
189/// trace flag is enabled. Return success to the target program.
190SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
191 LiveProcess *p, ThreadContext *tc);
192SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
193 LiveProcess *p, ThreadContext *tc);
194
195/// Target exit() handler: terminate current context.
196SyscallReturn exitFunc(SyscallDesc *desc, int num,
197 LiveProcess *p, ThreadContext *tc);
198
199/// Target exit_group() handler: terminate simulation. (exit all threads)
200SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
201 LiveProcess *p, ThreadContext *tc);
202
203/// Target getpagesize() handler.
204SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
205 LiveProcess *p, ThreadContext *tc);
206
207/// Target brk() handler: set brk address.
208SyscallReturn brkFunc(SyscallDesc *desc, int num,
209 LiveProcess *p, ThreadContext *tc);
210
211/// Target close() handler.
212SyscallReturn closeFunc(SyscallDesc *desc, int num,
213 LiveProcess *p, ThreadContext *tc);
214
215/// Target read() handler.
216SyscallReturn readFunc(SyscallDesc *desc, int num,
217 LiveProcess *p, ThreadContext *tc);
218
219/// Target write() handler.
220SyscallReturn writeFunc(SyscallDesc *desc, int num,
221 LiveProcess *p, ThreadContext *tc);
222
223/// Target lseek() handler.
224SyscallReturn lseekFunc(SyscallDesc *desc, int num,
225 LiveProcess *p, ThreadContext *tc);
226
227/// Target _llseek() handler.
228SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
229 LiveProcess *p, ThreadContext *tc);
230
231/// Target munmap() handler.
232SyscallReturn munmapFunc(SyscallDesc *desc, int num,
233 LiveProcess *p, ThreadContext *tc);
234
235/// Target gethostname() handler.
236SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
237 LiveProcess *p, ThreadContext *tc);
238
239/// Target getcwd() handler.
240SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
241 LiveProcess *p, ThreadContext *tc);
242
243/// Target unlink() handler.
244SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
245 LiveProcess *p, ThreadContext *tc);
246
247/// Target unlink() handler.
248SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
249 LiveProcess *p, ThreadContext *tc);
250
251/// Target mkdir() handler.
252SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
253 LiveProcess *p, ThreadContext *tc);
254
255/// Target rename() handler.
256SyscallReturn renameFunc(SyscallDesc *desc, int num,
257 LiveProcess *p, ThreadContext *tc);
258
259
260/// Target truncate() handler.
261SyscallReturn truncateFunc(SyscallDesc *desc, int num,
262 LiveProcess *p, ThreadContext *tc);
263
264
265/// Target ftruncate() handler.
266SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
267 LiveProcess *p, ThreadContext *tc);
268
269
270/// Target truncate64() handler.
271SyscallReturn truncate64Func(SyscallDesc *desc, int num,
272 LiveProcess *p, ThreadContext *tc);
273
274/// Target ftruncate64() handler.
275SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
276 LiveProcess *p, ThreadContext *tc);
277
278
279/// Target umask() handler.
280SyscallReturn umaskFunc(SyscallDesc *desc, int num,
281 LiveProcess *p, ThreadContext *tc);
282
283
284/// Target chown() handler.
285SyscallReturn chownFunc(SyscallDesc *desc, int num,
286 LiveProcess *p, ThreadContext *tc);
287
288
289/// Target fchown() handler.
290SyscallReturn fchownFunc(SyscallDesc *desc, int num,
291 LiveProcess *p, ThreadContext *tc);
292
293/// Target dup() handler.
294SyscallReturn dupFunc(SyscallDesc *desc, int num,
295 LiveProcess *process, ThreadContext *tc);
296
297/// Target fnctl() handler.
298SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
299 LiveProcess *process, ThreadContext *tc);
300
301/// Target fcntl64() handler.
302SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
303 LiveProcess *process, ThreadContext *tc);
304
305/// Target setuid() handler.
306SyscallReturn setuidFunc(SyscallDesc *desc, int num,
307 LiveProcess *p, ThreadContext *tc);
308
309/// Target getpid() handler.
310SyscallReturn getpidFunc(SyscallDesc *desc, int num,
311 LiveProcess *p, ThreadContext *tc);
312
313/// Target getuid() handler.
314SyscallReturn getuidFunc(SyscallDesc *desc, int num,
315 LiveProcess *p, ThreadContext *tc);
316
317/// Target getgid() handler.
318SyscallReturn getgidFunc(SyscallDesc *desc, int num,
319 LiveProcess *p, ThreadContext *tc);
320
321/// Target getppid() handler.
322SyscallReturn getppidFunc(SyscallDesc *desc, int num,
323 LiveProcess *p, ThreadContext *tc);
324
325/// Target geteuid() handler.
326SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
327 LiveProcess *p, ThreadContext *tc);
328
329/// Target getegid() handler.
330SyscallReturn getegidFunc(SyscallDesc *desc, int num,
331 LiveProcess *p, ThreadContext *tc);
332
333/// Target clone() handler.
334SyscallReturn cloneFunc(SyscallDesc *desc, int num,
335 LiveProcess *p, ThreadContext *tc);
336
337/// Futex system call
338/// Implemented by Daniel Sanchez
339/// Used by printf's in multi-threaded apps
340template <class OS>
341SyscallReturn
342futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
343 ThreadContext *tc)
344{
345 int index_uaddr = 0;
346 int index_op = 1;
347 int index_val = 2;
348 int index_timeout = 3;
349
350 uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
351 int op = process->getSyscallArg(tc, index_op);
352 int val = process->getSyscallArg(tc, index_val);
353 uint64_t timeout = process->getSyscallArg(tc, index_timeout);
354
355 std::map<uint64_t, std::list<ThreadContext *> * >
356 &futex_map = tc->getSystemPtr()->futexMap;
357
358 DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
359 uaddr, op, val);
360
361
362 if (op == OS::TGT_FUTEX_WAIT) {
363 if (timeout != 0) {
364 warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
365 "we'll wait indefinitely");
366 }
367
368 uint8_t *buf = new uint8_t[sizeof(int)];
369 tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
370 int mem_val = *((int *)buf);
371 delete buf;
372
373 if(val != mem_val) {
374 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
375 "expected: %d\n", mem_val, val);
376 return -OS::TGT_EWOULDBLOCK;
377 }
378
379 // Queue the thread context
380 std::list<ThreadContext *> * tcWaitList;
381 if (futex_map.count(uaddr)) {
382 tcWaitList = futex_map.find(uaddr)->second;
383 } else {
384 tcWaitList = new std::list<ThreadContext *>();
385 futex_map.insert(std::pair< uint64_t,
386 std::list<ThreadContext *> * >(uaddr, tcWaitList));
387 }
388 tcWaitList->push_back(tc);
389 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
390 "thread context\n");
391 tc->suspend();
392 return 0;
393 } else if (op == OS::TGT_FUTEX_WAKE){
394 int wokenUp = 0;
395 std::list<ThreadContext *> * tcWaitList;
396 if (futex_map.count(uaddr)) {
397 tcWaitList = futex_map.find(uaddr)->second;
398 while (tcWaitList->size() > 0 && wokenUp < val) {
399 tcWaitList->front()->activate();
400 tcWaitList->pop_front();
401 wokenUp++;
402 }
403 if(tcWaitList->empty()) {
404 futex_map.erase(uaddr);
405 delete tcWaitList;
406 }
407 }
408 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
409 "thread contexts\n", wokenUp);
410 return wokenUp;
411 } else {
412 warn("sys_futex: op %d is not implemented, just returning...");
413 return 0;
414 }
415
416}
417
418
419/// Pseudo Funcs - These functions use a different return convension,
420/// returning a second value in a register other than the normal return register
421SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
422 LiveProcess *process, ThreadContext *tc);
423
424/// Target getpidPseudo() handler.
425SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
426 LiveProcess *p, ThreadContext *tc);
427
428/// Target getuidPseudo() handler.
429SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
430 LiveProcess *p, ThreadContext *tc);
431
432/// Target getgidPseudo() handler.
433SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
434 LiveProcess *p, ThreadContext *tc);
435
436
437/// A readable name for 1,000,000, for converting microseconds to seconds.
438const int one_million = 1000000;
439
440/// Approximate seconds since the epoch (1/1/1970). About a billion,
441/// by my reckoning. We want to keep this a constant (not use the
442/// real-world time) to keep simulations repeatable.
443const unsigned seconds_since_epoch = 1000000000;
444
445/// Helper function to convert current elapsed time to seconds and
446/// microseconds.
447template <class T1, class T2>
448void
449getElapsedTime(T1 &sec, T2 &usec)
450{
451 int elapsed_usecs = curTick() / SimClock::Int::us;
452 sec = elapsed_usecs / one_million;
453 usec = elapsed_usecs % one_million;
454}
455
456//////////////////////////////////////////////////////////////////////
457//
458// The following emulation functions are generic, but need to be
459// templated to account for differences in types, constants, etc.
460//
461//////////////////////////////////////////////////////////////////////
462
463#if NO_STAT64
464 typedef struct stat hst_stat;
465 typedef struct stat hst_stat64;
466#else
467 typedef struct stat hst_stat;
468 typedef struct stat64 hst_stat64;
469#endif
470
471//// Helper function to convert a host stat buffer to a target stat
472//// buffer. Also copies the target buffer out to the simulated
473//// memory space. Used by stat(), fstat(), and lstat().
474
475template <typename target_stat, typename host_stat>
476static void
477convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
478{
479 using namespace TheISA;
480
481 if (fakeTTY)
482 tgt->st_dev = 0xA;
483 else
484 tgt->st_dev = host->st_dev;
485 tgt->st_dev = TheISA::htog(tgt->st_dev);
486 tgt->st_ino = host->st_ino;
487 tgt->st_ino = TheISA::htog(tgt->st_ino);
488 tgt->st_mode = host->st_mode;
489 if (fakeTTY) {
490 // Claim to be a character device
491 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
492 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
493 }
494 tgt->st_mode = TheISA::htog(tgt->st_mode);
495 tgt->st_nlink = host->st_nlink;
496 tgt->st_nlink = TheISA::htog(tgt->st_nlink);
497 tgt->st_uid = host->st_uid;
498 tgt->st_uid = TheISA::htog(tgt->st_uid);
499 tgt->st_gid = host->st_gid;
500 tgt->st_gid = TheISA::htog(tgt->st_gid);
501 if (fakeTTY)
502 tgt->st_rdev = 0x880d;
503 else
504 tgt->st_rdev = host->st_rdev;
505 tgt->st_rdev = TheISA::htog(tgt->st_rdev);
506 tgt->st_size = host->st_size;
507 tgt->st_size = TheISA::htog(tgt->st_size);
508 tgt->st_atimeX = host->st_atime;
509 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
510 tgt->st_mtimeX = host->st_mtime;
511 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
512 tgt->st_ctimeX = host->st_ctime;
513 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
514 // Force the block size to be 8k. This helps to ensure buffered io works
515 // consistently across different hosts.
516 tgt->st_blksize = 0x2000;
517 tgt->st_blksize = TheISA::htog(tgt->st_blksize);
518 tgt->st_blocks = host->st_blocks;
519 tgt->st_blocks = TheISA::htog(tgt->st_blocks);
520}
521
522// Same for stat64
523
524template <typename target_stat, typename host_stat64>
525static void
526convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
527{
528 using namespace TheISA;
529
530 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
531#if defined(STAT_HAVE_NSEC)
532 tgt->st_atime_nsec = host->st_atime_nsec;
533 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
534 tgt->st_mtime_nsec = host->st_mtime_nsec;
535 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
536 tgt->st_ctime_nsec = host->st_ctime_nsec;
537 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
538#else
539 tgt->st_atime_nsec = 0;
540 tgt->st_mtime_nsec = 0;
541 tgt->st_ctime_nsec = 0;
542#endif
543}
544
545//Here are a couple convenience functions
546template<class OS>
547static void
548copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
549 hst_stat *host, bool fakeTTY = false)
550{
551 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
552 tgt_stat_buf tgt(addr);
553 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
554 tgt.copyOut(mem);
555}
556
557template<class OS>
558static void
559copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
560 hst_stat64 *host, bool fakeTTY = false)
561{
562 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
563 tgt_stat_buf tgt(addr);
564 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
565 tgt.copyOut(mem);
566}
567
568/// Target ioctl() handler. For the most part, programs call ioctl()
569/// only to find out if their stdout is a tty, to determine whether to
570/// do line or block buffering. We always claim that output fds are
571/// not TTYs to provide repeatable results.
572template <class OS>
573SyscallReturn
574ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
575 ThreadContext *tc)
576{
577 int index = 0;
578 int fd = process->getSyscallArg(tc, index);
579 unsigned req = process->getSyscallArg(tc, index);
580
581 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
582
583 if (fd < 0 || process->sim_fd(fd) < 0) {
584 // doesn't map to any simulator fd: not a valid target fd
585 return -EBADF;
586 }
587
588 if (OS::isTtyReq(req)) {
589 return -ENOTTY;
590 }
591
592 warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
593 fd, req, tc->pcState());
594 return -ENOTTY;
595}
596
597/// Target open() handler.
598template <class OS>
599SyscallReturn
600openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
601 ThreadContext *tc)
602{
603 std::string path;
604
605 int index = 0;
606 if (!tc->getMemProxy().tryReadString(path,
607 process->getSyscallArg(tc, index)))
608 return -EFAULT;
609
610 if (path == "/dev/sysdev0") {
611 // This is a memory-mapped high-resolution timer device on Alpha.
612 // We don't support it, so just punt.
613 warn("Ignoring open(%s, ...)\n", path);
614 return -ENOENT;
615 }
616
617 int tgtFlags = process->getSyscallArg(tc, index);
618 int mode = process->getSyscallArg(tc, index);
619 int hostFlags = 0;
620
621 // translate open flags
622 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
623 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
624 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
625 hostFlags |= OS::openFlagTable[i].hostFlag;
626 }
627 }
628
629 // any target flags left?
630 if (tgtFlags != 0)
631 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
632
633#ifdef __CYGWIN32__
634 hostFlags |= O_BINARY;
635#endif
636
637 // Adjust path for current working directory
638 path = process->fullPath(path);
639
640 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
641
642 int fd;
| 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#ifdef __CYGWIN32__
45#include <sys/fcntl.h> // for O_BINARY
46#endif
47#include <sys/stat.h>
48#include <sys/time.h>
49#include <sys/uio.h>
50#include <fcntl.h>
51
52#include <cerrno>
53#include <string>
54
55#include "base/chunk_generator.hh"
56#include "base/intmath.hh" // for RoundUp
57#include "base/misc.hh"
58#include "base/trace.hh"
59#include "base/types.hh"
60#include "config/the_isa.hh"
61#include "cpu/base.hh"
62#include "cpu/thread_context.hh"
63#include "debug/SyscallVerbose.hh"
64#include "mem/page_table.hh"
65#include "mem/se_translating_port_proxy.hh"
66#include "sim/byteswap.hh"
67#include "sim/process.hh"
68#include "sim/syscallreturn.hh"
69#include "sim/system.hh"
70
71///
72/// System call descriptor.
73///
74class SyscallDesc {
75
76 public:
77
78 /// Typedef for target syscall handler functions.
79 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
80 LiveProcess *, ThreadContext *);
81
82 const char *name; //!< Syscall name (e.g., "open").
83 FuncPtr funcPtr; //!< Pointer to emulation function.
84 int flags; //!< Flags (see Flags enum).
85
86 /// Flag values for controlling syscall behavior.
87 enum Flags {
88 /// Don't set return regs according to funcPtr return value.
89 /// Used for syscalls with non-standard return conventions
90 /// that explicitly set the ThreadContext regs (e.g.,
91 /// sigreturn).
92 SuppressReturnValue = 1
93 };
94
95 /// Constructor.
96 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
97 : name(_name), funcPtr(_funcPtr), flags(_flags)
98 {
99 }
100
101 /// Emulate the syscall. Public interface for calling through funcPtr.
102 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
103};
104
105
106class BaseBufferArg {
107
108 public:
109
110 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
111 {
112 bufPtr = new uint8_t[size];
113 // clear out buffer: in case we only partially populate this,
114 // and then do a copyOut(), we want to make sure we don't
115 // introduce any random junk into the simulated address space
116 memset(bufPtr, 0, size);
117 }
118
119 virtual ~BaseBufferArg() { delete [] bufPtr; }
120
121 //
122 // copy data into simulator space (read from target memory)
123 //
124 virtual bool copyIn(SETranslatingPortProxy &memproxy)
125 {
126 memproxy.readBlob(addr, bufPtr, size);
127 return true; // no EFAULT detection for now
128 }
129
130 //
131 // copy data out of simulator space (write to target memory)
132 //
133 virtual bool copyOut(SETranslatingPortProxy &memproxy)
134 {
135 memproxy.writeBlob(addr, bufPtr, size);
136 return true; // no EFAULT detection for now
137 }
138
139 protected:
140 Addr addr;
141 int size;
142 uint8_t *bufPtr;
143};
144
145
146class BufferArg : public BaseBufferArg
147{
148 public:
149 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
150 void *bufferPtr() { return bufPtr; }
151};
152
153template <class T>
154class TypedBufferArg : public BaseBufferArg
155{
156 public:
157 // user can optionally specify a specific number of bytes to
158 // allocate to deal with those structs that have variable-size
159 // arrays at the end
160 TypedBufferArg(Addr _addr, int _size = sizeof(T))
161 : BaseBufferArg(_addr, _size)
162 { }
163
164 // type case
165 operator T*() { return (T *)bufPtr; }
166
167 // dereference operators
168 T &operator*() { return *((T *)bufPtr); }
169 T* operator->() { return (T *)bufPtr; }
170 T &operator[](int i) { return ((T *)bufPtr)[i]; }
171};
172
173//////////////////////////////////////////////////////////////////////
174//
175// The following emulation functions are generic enough that they
176// don't need to be recompiled for different emulated OS's. They are
177// defined in sim/syscall_emul.cc.
178//
179//////////////////////////////////////////////////////////////////////
180
181
182/// Handler for unimplemented syscalls that we haven't thought about.
183SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
184 LiveProcess *p, ThreadContext *tc);
185
186/// Handler for unimplemented syscalls that we never intend to
187/// implement (signal handling, etc.) and should not affect the correct
188/// behavior of the program. Print a warning only if the appropriate
189/// trace flag is enabled. Return success to the target program.
190SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
191 LiveProcess *p, ThreadContext *tc);
192SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
193 LiveProcess *p, ThreadContext *tc);
194
195/// Target exit() handler: terminate current context.
196SyscallReturn exitFunc(SyscallDesc *desc, int num,
197 LiveProcess *p, ThreadContext *tc);
198
199/// Target exit_group() handler: terminate simulation. (exit all threads)
200SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
201 LiveProcess *p, ThreadContext *tc);
202
203/// Target getpagesize() handler.
204SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
205 LiveProcess *p, ThreadContext *tc);
206
207/// Target brk() handler: set brk address.
208SyscallReturn brkFunc(SyscallDesc *desc, int num,
209 LiveProcess *p, ThreadContext *tc);
210
211/// Target close() handler.
212SyscallReturn closeFunc(SyscallDesc *desc, int num,
213 LiveProcess *p, ThreadContext *tc);
214
215/// Target read() handler.
216SyscallReturn readFunc(SyscallDesc *desc, int num,
217 LiveProcess *p, ThreadContext *tc);
218
219/// Target write() handler.
220SyscallReturn writeFunc(SyscallDesc *desc, int num,
221 LiveProcess *p, ThreadContext *tc);
222
223/// Target lseek() handler.
224SyscallReturn lseekFunc(SyscallDesc *desc, int num,
225 LiveProcess *p, ThreadContext *tc);
226
227/// Target _llseek() handler.
228SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
229 LiveProcess *p, ThreadContext *tc);
230
231/// Target munmap() handler.
232SyscallReturn munmapFunc(SyscallDesc *desc, int num,
233 LiveProcess *p, ThreadContext *tc);
234
235/// Target gethostname() handler.
236SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
237 LiveProcess *p, ThreadContext *tc);
238
239/// Target getcwd() handler.
240SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
241 LiveProcess *p, ThreadContext *tc);
242
243/// Target unlink() handler.
244SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
245 LiveProcess *p, ThreadContext *tc);
246
247/// Target unlink() handler.
248SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
249 LiveProcess *p, ThreadContext *tc);
250
251/// Target mkdir() handler.
252SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
253 LiveProcess *p, ThreadContext *tc);
254
255/// Target rename() handler.
256SyscallReturn renameFunc(SyscallDesc *desc, int num,
257 LiveProcess *p, ThreadContext *tc);
258
259
260/// Target truncate() handler.
261SyscallReturn truncateFunc(SyscallDesc *desc, int num,
262 LiveProcess *p, ThreadContext *tc);
263
264
265/// Target ftruncate() handler.
266SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
267 LiveProcess *p, ThreadContext *tc);
268
269
270/// Target truncate64() handler.
271SyscallReturn truncate64Func(SyscallDesc *desc, int num,
272 LiveProcess *p, ThreadContext *tc);
273
274/// Target ftruncate64() handler.
275SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
276 LiveProcess *p, ThreadContext *tc);
277
278
279/// Target umask() handler.
280SyscallReturn umaskFunc(SyscallDesc *desc, int num,
281 LiveProcess *p, ThreadContext *tc);
282
283
284/// Target chown() handler.
285SyscallReturn chownFunc(SyscallDesc *desc, int num,
286 LiveProcess *p, ThreadContext *tc);
287
288
289/// Target fchown() handler.
290SyscallReturn fchownFunc(SyscallDesc *desc, int num,
291 LiveProcess *p, ThreadContext *tc);
292
293/// Target dup() handler.
294SyscallReturn dupFunc(SyscallDesc *desc, int num,
295 LiveProcess *process, ThreadContext *tc);
296
297/// Target fnctl() handler.
298SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
299 LiveProcess *process, ThreadContext *tc);
300
301/// Target fcntl64() handler.
302SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
303 LiveProcess *process, ThreadContext *tc);
304
305/// Target setuid() handler.
306SyscallReturn setuidFunc(SyscallDesc *desc, int num,
307 LiveProcess *p, ThreadContext *tc);
308
309/// Target getpid() handler.
310SyscallReturn getpidFunc(SyscallDesc *desc, int num,
311 LiveProcess *p, ThreadContext *tc);
312
313/// Target getuid() handler.
314SyscallReturn getuidFunc(SyscallDesc *desc, int num,
315 LiveProcess *p, ThreadContext *tc);
316
317/// Target getgid() handler.
318SyscallReturn getgidFunc(SyscallDesc *desc, int num,
319 LiveProcess *p, ThreadContext *tc);
320
321/// Target getppid() handler.
322SyscallReturn getppidFunc(SyscallDesc *desc, int num,
323 LiveProcess *p, ThreadContext *tc);
324
325/// Target geteuid() handler.
326SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
327 LiveProcess *p, ThreadContext *tc);
328
329/// Target getegid() handler.
330SyscallReturn getegidFunc(SyscallDesc *desc, int num,
331 LiveProcess *p, ThreadContext *tc);
332
333/// Target clone() handler.
334SyscallReturn cloneFunc(SyscallDesc *desc, int num,
335 LiveProcess *p, ThreadContext *tc);
336
337/// Futex system call
338/// Implemented by Daniel Sanchez
339/// Used by printf's in multi-threaded apps
340template <class OS>
341SyscallReturn
342futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
343 ThreadContext *tc)
344{
345 int index_uaddr = 0;
346 int index_op = 1;
347 int index_val = 2;
348 int index_timeout = 3;
349
350 uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
351 int op = process->getSyscallArg(tc, index_op);
352 int val = process->getSyscallArg(tc, index_val);
353 uint64_t timeout = process->getSyscallArg(tc, index_timeout);
354
355 std::map<uint64_t, std::list<ThreadContext *> * >
356 &futex_map = tc->getSystemPtr()->futexMap;
357
358 DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
359 uaddr, op, val);
360
361
362 if (op == OS::TGT_FUTEX_WAIT) {
363 if (timeout != 0) {
364 warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
365 "we'll wait indefinitely");
366 }
367
368 uint8_t *buf = new uint8_t[sizeof(int)];
369 tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
370 int mem_val = *((int *)buf);
371 delete buf;
372
373 if(val != mem_val) {
374 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
375 "expected: %d\n", mem_val, val);
376 return -OS::TGT_EWOULDBLOCK;
377 }
378
379 // Queue the thread context
380 std::list<ThreadContext *> * tcWaitList;
381 if (futex_map.count(uaddr)) {
382 tcWaitList = futex_map.find(uaddr)->second;
383 } else {
384 tcWaitList = new std::list<ThreadContext *>();
385 futex_map.insert(std::pair< uint64_t,
386 std::list<ThreadContext *> * >(uaddr, tcWaitList));
387 }
388 tcWaitList->push_back(tc);
389 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
390 "thread context\n");
391 tc->suspend();
392 return 0;
393 } else if (op == OS::TGT_FUTEX_WAKE){
394 int wokenUp = 0;
395 std::list<ThreadContext *> * tcWaitList;
396 if (futex_map.count(uaddr)) {
397 tcWaitList = futex_map.find(uaddr)->second;
398 while (tcWaitList->size() > 0 && wokenUp < val) {
399 tcWaitList->front()->activate();
400 tcWaitList->pop_front();
401 wokenUp++;
402 }
403 if(tcWaitList->empty()) {
404 futex_map.erase(uaddr);
405 delete tcWaitList;
406 }
407 }
408 DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
409 "thread contexts\n", wokenUp);
410 return wokenUp;
411 } else {
412 warn("sys_futex: op %d is not implemented, just returning...");
413 return 0;
414 }
415
416}
417
418
419/// Pseudo Funcs - These functions use a different return convension,
420/// returning a second value in a register other than the normal return register
421SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
422 LiveProcess *process, ThreadContext *tc);
423
424/// Target getpidPseudo() handler.
425SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
426 LiveProcess *p, ThreadContext *tc);
427
428/// Target getuidPseudo() handler.
429SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
430 LiveProcess *p, ThreadContext *tc);
431
432/// Target getgidPseudo() handler.
433SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
434 LiveProcess *p, ThreadContext *tc);
435
436
437/// A readable name for 1,000,000, for converting microseconds to seconds.
438const int one_million = 1000000;
439
440/// Approximate seconds since the epoch (1/1/1970). About a billion,
441/// by my reckoning. We want to keep this a constant (not use the
442/// real-world time) to keep simulations repeatable.
443const unsigned seconds_since_epoch = 1000000000;
444
445/// Helper function to convert current elapsed time to seconds and
446/// microseconds.
447template <class T1, class T2>
448void
449getElapsedTime(T1 &sec, T2 &usec)
450{
451 int elapsed_usecs = curTick() / SimClock::Int::us;
452 sec = elapsed_usecs / one_million;
453 usec = elapsed_usecs % one_million;
454}
455
456//////////////////////////////////////////////////////////////////////
457//
458// The following emulation functions are generic, but need to be
459// templated to account for differences in types, constants, etc.
460//
461//////////////////////////////////////////////////////////////////////
462
463#if NO_STAT64
464 typedef struct stat hst_stat;
465 typedef struct stat hst_stat64;
466#else
467 typedef struct stat hst_stat;
468 typedef struct stat64 hst_stat64;
469#endif
470
471//// Helper function to convert a host stat buffer to a target stat
472//// buffer. Also copies the target buffer out to the simulated
473//// memory space. Used by stat(), fstat(), and lstat().
474
475template <typename target_stat, typename host_stat>
476static void
477convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
478{
479 using namespace TheISA;
480
481 if (fakeTTY)
482 tgt->st_dev = 0xA;
483 else
484 tgt->st_dev = host->st_dev;
485 tgt->st_dev = TheISA::htog(tgt->st_dev);
486 tgt->st_ino = host->st_ino;
487 tgt->st_ino = TheISA::htog(tgt->st_ino);
488 tgt->st_mode = host->st_mode;
489 if (fakeTTY) {
490 // Claim to be a character device
491 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
492 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
493 }
494 tgt->st_mode = TheISA::htog(tgt->st_mode);
495 tgt->st_nlink = host->st_nlink;
496 tgt->st_nlink = TheISA::htog(tgt->st_nlink);
497 tgt->st_uid = host->st_uid;
498 tgt->st_uid = TheISA::htog(tgt->st_uid);
499 tgt->st_gid = host->st_gid;
500 tgt->st_gid = TheISA::htog(tgt->st_gid);
501 if (fakeTTY)
502 tgt->st_rdev = 0x880d;
503 else
504 tgt->st_rdev = host->st_rdev;
505 tgt->st_rdev = TheISA::htog(tgt->st_rdev);
506 tgt->st_size = host->st_size;
507 tgt->st_size = TheISA::htog(tgt->st_size);
508 tgt->st_atimeX = host->st_atime;
509 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
510 tgt->st_mtimeX = host->st_mtime;
511 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
512 tgt->st_ctimeX = host->st_ctime;
513 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
514 // Force the block size to be 8k. This helps to ensure buffered io works
515 // consistently across different hosts.
516 tgt->st_blksize = 0x2000;
517 tgt->st_blksize = TheISA::htog(tgt->st_blksize);
518 tgt->st_blocks = host->st_blocks;
519 tgt->st_blocks = TheISA::htog(tgt->st_blocks);
520}
521
522// Same for stat64
523
524template <typename target_stat, typename host_stat64>
525static void
526convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
527{
528 using namespace TheISA;
529
530 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
531#if defined(STAT_HAVE_NSEC)
532 tgt->st_atime_nsec = host->st_atime_nsec;
533 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
534 tgt->st_mtime_nsec = host->st_mtime_nsec;
535 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
536 tgt->st_ctime_nsec = host->st_ctime_nsec;
537 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
538#else
539 tgt->st_atime_nsec = 0;
540 tgt->st_mtime_nsec = 0;
541 tgt->st_ctime_nsec = 0;
542#endif
543}
544
545//Here are a couple convenience functions
546template<class OS>
547static void
548copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
549 hst_stat *host, bool fakeTTY = false)
550{
551 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
552 tgt_stat_buf tgt(addr);
553 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
554 tgt.copyOut(mem);
555}
556
557template<class OS>
558static void
559copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
560 hst_stat64 *host, bool fakeTTY = false)
561{
562 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
563 tgt_stat_buf tgt(addr);
564 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
565 tgt.copyOut(mem);
566}
567
568/// Target ioctl() handler. For the most part, programs call ioctl()
569/// only to find out if their stdout is a tty, to determine whether to
570/// do line or block buffering. We always claim that output fds are
571/// not TTYs to provide repeatable results.
572template <class OS>
573SyscallReturn
574ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
575 ThreadContext *tc)
576{
577 int index = 0;
578 int fd = process->getSyscallArg(tc, index);
579 unsigned req = process->getSyscallArg(tc, index);
580
581 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
582
583 if (fd < 0 || process->sim_fd(fd) < 0) {
584 // doesn't map to any simulator fd: not a valid target fd
585 return -EBADF;
586 }
587
588 if (OS::isTtyReq(req)) {
589 return -ENOTTY;
590 }
591
592 warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
593 fd, req, tc->pcState());
594 return -ENOTTY;
595}
596
597/// Target open() handler.
598template <class OS>
599SyscallReturn
600openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
601 ThreadContext *tc)
602{
603 std::string path;
604
605 int index = 0;
606 if (!tc->getMemProxy().tryReadString(path,
607 process->getSyscallArg(tc, index)))
608 return -EFAULT;
609
610 if (path == "/dev/sysdev0") {
611 // This is a memory-mapped high-resolution timer device on Alpha.
612 // We don't support it, so just punt.
613 warn("Ignoring open(%s, ...)\n", path);
614 return -ENOENT;
615 }
616
617 int tgtFlags = process->getSyscallArg(tc, index);
618 int mode = process->getSyscallArg(tc, index);
619 int hostFlags = 0;
620
621 // translate open flags
622 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
623 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
624 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
625 hostFlags |= OS::openFlagTable[i].hostFlag;
626 }
627 }
628
629 // any target flags left?
630 if (tgtFlags != 0)
631 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
632
633#ifdef __CYGWIN32__
634 hostFlags |= O_BINARY;
635#endif
636
637 // Adjust path for current working directory
638 path = process->fullPath(path);
639
640 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
641
642 int fd;
|
645 // It's a proc/sys entery and requires special handling
646 fd = OS::openSpecialFile(path, process, tc);
647 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
648 } else {
649 // open the file
650 fd = open(path.c_str(), hostFlags, mode);
651 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
652 }
653
654}
655
656/// Target sysinfo() handler.
657template <class OS>
658SyscallReturn
659sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
660 ThreadContext *tc)
661{
662
663 int index = 0;
664 TypedBufferArg<typename OS::tgt_sysinfo>
665 sysinfo(process->getSyscallArg(tc, index));
666
667 sysinfo->uptime=seconds_since_epoch;
668 sysinfo->totalram=process->system->memSize();
669
670 sysinfo.copyOut(tc->getMemProxy());
671
672 return 0;
673}
674
675/// Target chmod() handler.
676template <class OS>
677SyscallReturn
678chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
679 ThreadContext *tc)
680{
681 std::string path;
682
683 int index = 0;
684 if (!tc->getMemProxy().tryReadString(path,
685 process->getSyscallArg(tc, index))) {
686 return -EFAULT;
687 }
688
689 uint32_t mode = process->getSyscallArg(tc, index);
690 mode_t hostMode = 0;
691
692 // XXX translate mode flags via OS::something???
693 hostMode = mode;
694
695 // Adjust path for current working directory
696 path = process->fullPath(path);
697
698 // do the chmod
699 int result = chmod(path.c_str(), hostMode);
700 if (result < 0)
701 return -errno;
702
703 return 0;
704}
705
706
707/// Target fchmod() handler.
708template <class OS>
709SyscallReturn
710fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
711 ThreadContext *tc)
712{
713 int index = 0;
714 int fd = process->getSyscallArg(tc, index);
715 if (fd < 0 || process->sim_fd(fd) < 0) {
716 // doesn't map to any simulator fd: not a valid target fd
717 return -EBADF;
718 }
719
720 uint32_t mode = process->getSyscallArg(tc, index);
721 mode_t hostMode = 0;
722
723 // XXX translate mode flags via OS::someting???
724 hostMode = mode;
725
726 // do the fchmod
727 int result = fchmod(process->sim_fd(fd), hostMode);
728 if (result < 0)
729 return -errno;
730
731 return 0;
732}
733
734/// Target mremap() handler.
735template <class OS>
736SyscallReturn
737mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
738{
739 int index = 0;
740 Addr start = process->getSyscallArg(tc, index);
741 uint64_t old_length = process->getSyscallArg(tc, index);
742 uint64_t new_length = process->getSyscallArg(tc, index);
743 uint64_t flags = process->getSyscallArg(tc, index);
744
745 if ((start % TheISA::VMPageSize != 0) ||
746 (new_length % TheISA::VMPageSize != 0)) {
747 warn("mremap failing: arguments not page aligned");
748 return -EINVAL;
749 }
750
751 if (new_length > old_length) {
752 if ((start + old_length) == process->mmap_end) {
753 uint64_t diff = new_length - old_length;
754 process->allocateMem(process->mmap_end, diff);
755 process->mmap_end += diff;
756 return start;
757 } else {
758 // sys/mman.h defined MREMAP_MAYMOVE
759 if (!(flags & 1)) {
760 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
761 return -ENOMEM;
762 } else {
763 process->pTable->remap(start, old_length, process->mmap_end);
764 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
765 process->mmap_end, process->mmap_end + new_length, new_length);
766 start = process->mmap_end;
767 // add on the remaining unallocated pages
768 process->allocateMem(start + old_length,
769 new_length - old_length);
770 process->mmap_end += new_length;
771 warn("returning %08p as start\n", start);
772 return start;
773 }
774 }
775 } else {
776 process->pTable->unmap(start + new_length, old_length - new_length);
777 return start;
778 }
779}
780
781/// Target stat() handler.
782template <class OS>
783SyscallReturn
784statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
785 ThreadContext *tc)
786{
787 std::string path;
788
789 int index = 0;
790 if (!tc->getMemProxy().tryReadString(path,
791 process->getSyscallArg(tc, index))) {
792 return -EFAULT;
793 }
794 Addr bufPtr = process->getSyscallArg(tc, index);
795
796 // Adjust path for current working directory
797 path = process->fullPath(path);
798
799 struct stat hostBuf;
800 int result = stat(path.c_str(), &hostBuf);
801
802 if (result < 0)
803 return -errno;
804
805 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
806
807 return 0;
808}
809
810
811/// Target stat64() handler.
812template <class OS>
813SyscallReturn
814stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
815 ThreadContext *tc)
816{
817 std::string path;
818
819 int index = 0;
820 if (!tc->getMemProxy().tryReadString(path,
821 process->getSyscallArg(tc, index)))
822 return -EFAULT;
823 Addr bufPtr = process->getSyscallArg(tc, index);
824
825 // Adjust path for current working directory
826 path = process->fullPath(path);
827
828#if NO_STAT64
829 struct stat hostBuf;
830 int result = stat(path.c_str(), &hostBuf);
831#else
832 struct stat64 hostBuf;
833 int result = stat64(path.c_str(), &hostBuf);
834#endif
835
836 if (result < 0)
837 return -errno;
838
839 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
840
841 return 0;
842}
843
844
845/// Target fstat64() handler.
846template <class OS>
847SyscallReturn
848fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
849 ThreadContext *tc)
850{
851 int index = 0;
852 int fd = process->getSyscallArg(tc, index);
853 Addr bufPtr = process->getSyscallArg(tc, index);
854 if (fd < 0 || process->sim_fd(fd) < 0) {
855 // doesn't map to any simulator fd: not a valid target fd
856 return -EBADF;
857 }
858
859#if NO_STAT64
860 struct stat hostBuf;
861 int result = fstat(process->sim_fd(fd), &hostBuf);
862#else
863 struct stat64 hostBuf;
864 int result = fstat64(process->sim_fd(fd), &hostBuf);
865#endif
866
867 if (result < 0)
868 return -errno;
869
870 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
871
872 return 0;
873}
874
875
876/// Target lstat() handler.
877template <class OS>
878SyscallReturn
879lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
880 ThreadContext *tc)
881{
882 std::string path;
883
884 int index = 0;
885 if (!tc->getMemProxy().tryReadString(path,
886 process->getSyscallArg(tc, index))) {
887 return -EFAULT;
888 }
889 Addr bufPtr = process->getSyscallArg(tc, index);
890
891 // Adjust path for current working directory
892 path = process->fullPath(path);
893
894 struct stat hostBuf;
895 int result = lstat(path.c_str(), &hostBuf);
896
897 if (result < 0)
898 return -errno;
899
900 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
901
902 return 0;
903}
904
905/// Target lstat64() handler.
906template <class OS>
907SyscallReturn
908lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
909 ThreadContext *tc)
910{
911 std::string path;
912
913 int index = 0;
914 if (!tc->getMemProxy().tryReadString(path,
915 process->getSyscallArg(tc, index))) {
916 return -EFAULT;
917 }
918 Addr bufPtr = process->getSyscallArg(tc, index);
919
920 // Adjust path for current working directory
921 path = process->fullPath(path);
922
923#if NO_STAT64
924 struct stat hostBuf;
925 int result = lstat(path.c_str(), &hostBuf);
926#else
927 struct stat64 hostBuf;
928 int result = lstat64(path.c_str(), &hostBuf);
929#endif
930
931 if (result < 0)
932 return -errno;
933
934 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
935
936 return 0;
937}
938
939/// Target fstat() handler.
940template <class OS>
941SyscallReturn
942fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
943 ThreadContext *tc)
944{
945 int index = 0;
946 int fd = process->sim_fd(process->getSyscallArg(tc, index));
947 Addr bufPtr = process->getSyscallArg(tc, index);
948
949 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
950
951 if (fd < 0)
952 return -EBADF;
953
954 struct stat hostBuf;
955 int result = fstat(fd, &hostBuf);
956
957 if (result < 0)
958 return -errno;
959
960 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
961
962 return 0;
963}
964
965
966/// Target statfs() handler.
967template <class OS>
968SyscallReturn
969statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
970 ThreadContext *tc)
971{
972 std::string path;
973
974 int index = 0;
975 if (!tc->getMemProxy().tryReadString(path,
976 process->getSyscallArg(tc, index))) {
977 return -EFAULT;
978 }
979 Addr bufPtr = process->getSyscallArg(tc, index);
980
981 // Adjust path for current working directory
982 path = process->fullPath(path);
983
984 struct statfs hostBuf;
985 int result = statfs(path.c_str(), &hostBuf);
986
987 if (result < 0)
988 return -errno;
989
990 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
991
992 return 0;
993}
994
995
996/// Target fstatfs() handler.
997template <class OS>
998SyscallReturn
999fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1000 ThreadContext *tc)
1001{
1002 int index = 0;
1003 int fd = process->sim_fd(process->getSyscallArg(tc, index));
1004 Addr bufPtr = process->getSyscallArg(tc, index);
1005
1006 if (fd < 0)
1007 return -EBADF;
1008
1009 struct statfs hostBuf;
1010 int result = fstatfs(fd, &hostBuf);
1011
1012 if (result < 0)
1013 return -errno;
1014
1015 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1016
1017 return 0;
1018}
1019
1020
1021/// Target writev() handler.
1022template <class OS>
1023SyscallReturn
1024writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1025 ThreadContext *tc)
1026{
1027 int index = 0;
1028 int fd = process->getSyscallArg(tc, index);
1029 if (fd < 0 || process->sim_fd(fd) < 0) {
1030 // doesn't map to any simulator fd: not a valid target fd
1031 return -EBADF;
1032 }
1033
1034 SETranslatingPortProxy &p = tc->getMemProxy();
1035 uint64_t tiov_base = process->getSyscallArg(tc, index);
1036 size_t count = process->getSyscallArg(tc, index);
1037 struct iovec hiov[count];
1038 for (size_t i = 0; i < count; ++i) {
1039 typename OS::tgt_iovec tiov;
1040
1041 p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1042 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1043 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1044 hiov[i].iov_base = new char [hiov[i].iov_len];
1045 p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1046 hiov[i].iov_len);
1047 }
1048
1049 int result = writev(process->sim_fd(fd), hiov, count);
1050
1051 for (size_t i = 0; i < count; ++i)
1052 delete [] (char *)hiov[i].iov_base;
1053
1054 if (result < 0)
1055 return -errno;
1056
1057 return 0;
1058}
1059
1060
1061/// Target mmap() handler.
1062///
1063/// We don't really handle mmap(). If the target is mmaping an
1064/// anonymous region or /dev/zero, we can get away with doing basically
1065/// nothing (since memory is initialized to zero and the simulator
1066/// doesn't really check addresses anyway).
1067///
1068template <class OS>
1069SyscallReturn
1070mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1071{
1072 int index = 0;
1073 Addr start = p->getSyscallArg(tc, index);
1074 uint64_t length = p->getSyscallArg(tc, index);
1075 index++; // int prot = p->getSyscallArg(tc, index);
1076 int flags = p->getSyscallArg(tc, index);
1077 int tgt_fd = p->getSyscallArg(tc, index);
1078 // int offset = p->getSyscallArg(tc, index);
1079
1080 if (length > 0x100000000ULL)
1081 warn("mmap length argument %#x is unreasonably large.\n", length);
1082
1083 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1084 Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1085 if (!fd_map || fd_map->fd < 0) {
1086 warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1087 return -EBADF;
1088 }
1089
1090 if (fd_map->filename != "/dev/zero") {
1091 // This is very likely broken, but leave a warning here
1092 // (rather than panic) in case /dev/zero is known by
1093 // another name on some platform
1094 warn("allowing mmap of file %s; mmap not supported on files"
1095 " other than /dev/zero\n", fd_map->filename);
1096 }
1097 }
1098
1099 if ((start % TheISA::VMPageSize) != 0 ||
1100 (length % TheISA::VMPageSize) != 0) {
1101 warn("mmap failing: arguments not page-aligned: "
1102 "start 0x%x length 0x%x",
1103 start, length);
1104 return -EINVAL;
1105 }
1106
1107 // are we ok with clobbering existing mappings? only set this to
1108 // true if the user has been warned.
1109 bool clobber = false;
1110
1111 // try to use the caller-provided address if there is one
1112 bool use_provided_address = (start != 0);
1113
1114 if (use_provided_address) {
1115 // check to see if the desired address is already in use
1116 if (!p->pTable->isUnmapped(start, length)) {
1117 // there are existing mappings in the desired range
1118 // whether we clobber them or not depends on whether the caller
1119 // specified MAP_FIXED
1120 if (flags & OS::TGT_MAP_FIXED) {
1121 // MAP_FIXED specified: clobber existing mappings
1122 warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
1123 start);
1124 clobber = true;
1125 } else {
1126 // MAP_FIXED not specified: ignore suggested start address
1127 warn("mmap: ignoring suggested map address 0x%x\n", start);
1128 use_provided_address = false;
1129 }
1130 }
1131 }
1132
1133 if (!use_provided_address) {
1134 // no address provided, or provided address unusable:
1135 // pick next address from our "mmap region"
1136 if (OS::mmapGrowsDown()) {
1137 start = p->mmap_end - length;
1138 p->mmap_end = start;
1139 } else {
1140 start = p->mmap_end;
1141 p->mmap_end += length;
1142 }
1143 }
1144
1145 p->allocateMem(start, length, clobber);
1146
1147 return start;
1148}
1149
1150/// Target getrlimit() handler.
1151template <class OS>
1152SyscallReturn
1153getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1154 ThreadContext *tc)
1155{
1156 int index = 0;
1157 unsigned resource = process->getSyscallArg(tc, index);
1158 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1159
1160 switch (resource) {
1161 case OS::TGT_RLIMIT_STACK:
1162 // max stack size in bytes: make up a number (8MB for now)
1163 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1164 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1165 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1166 break;
1167
1168 case OS::TGT_RLIMIT_DATA:
1169 // max data segment size in bytes: make up a number
1170 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1171 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1172 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1173 break;
1174
1175 default:
1176 std::cerr << "getrlimitFunc: unimplemented resource " << resource
1177 << std::endl;
1178 abort();
1179 break;
1180 }
1181
1182 rlp.copyOut(tc->getMemProxy());
1183 return 0;
1184}
1185
1186/// Target gettimeofday() handler.
1187template <class OS>
1188SyscallReturn
1189gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1190 ThreadContext *tc)
1191{
1192 int index = 0;
1193 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1194
1195 getElapsedTime(tp->tv_sec, tp->tv_usec);
1196 tp->tv_sec += seconds_since_epoch;
1197 tp->tv_sec = TheISA::htog(tp->tv_sec);
1198 tp->tv_usec = TheISA::htog(tp->tv_usec);
1199
1200 tp.copyOut(tc->getMemProxy());
1201
1202 return 0;
1203}
1204
1205
1206/// Target utimes() handler.
1207template <class OS>
1208SyscallReturn
1209utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1210 ThreadContext *tc)
1211{
1212 std::string path;
1213
1214 int index = 0;
1215 if (!tc->getMemProxy().tryReadString(path,
1216 process->getSyscallArg(tc, index))) {
1217 return -EFAULT;
1218 }
1219
1220 TypedBufferArg<typename OS::timeval [2]>
1221 tp(process->getSyscallArg(tc, index));
1222 tp.copyIn(tc->getMemProxy());
1223
1224 struct timeval hostTimeval[2];
1225 for (int i = 0; i < 2; ++i)
1226 {
1227 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1228 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1229 }
1230
1231 // Adjust path for current working directory
1232 path = process->fullPath(path);
1233
1234 int result = utimes(path.c_str(), hostTimeval);
1235
1236 if (result < 0)
1237 return -errno;
1238
1239 return 0;
1240}
1241/// Target getrusage() function.
1242template <class OS>
1243SyscallReturn
1244getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1245 ThreadContext *tc)
1246{
1247 int index = 0;
1248 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1249 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1250
1251 rup->ru_utime.tv_sec = 0;
1252 rup->ru_utime.tv_usec = 0;
1253 rup->ru_stime.tv_sec = 0;
1254 rup->ru_stime.tv_usec = 0;
1255 rup->ru_maxrss = 0;
1256 rup->ru_ixrss = 0;
1257 rup->ru_idrss = 0;
1258 rup->ru_isrss = 0;
1259 rup->ru_minflt = 0;
1260 rup->ru_majflt = 0;
1261 rup->ru_nswap = 0;
1262 rup->ru_inblock = 0;
1263 rup->ru_oublock = 0;
1264 rup->ru_msgsnd = 0;
1265 rup->ru_msgrcv = 0;
1266 rup->ru_nsignals = 0;
1267 rup->ru_nvcsw = 0;
1268 rup->ru_nivcsw = 0;
1269
1270 switch (who) {
1271 case OS::TGT_RUSAGE_SELF:
1272 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1273 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1274 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1275 break;
1276
1277 case OS::TGT_RUSAGE_CHILDREN:
1278 // do nothing. We have no child processes, so they take no time.
1279 break;
1280
1281 default:
1282 // don't really handle THREAD or CHILDREN, but just warn and
1283 // plow ahead
1284 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1285 who);
1286 }
1287
1288 rup.copyOut(tc->getMemProxy());
1289
1290 return 0;
1291}
1292
1293/// Target times() function.
1294template <class OS>
1295SyscallReturn
1296timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1297 ThreadContext *tc)
1298{
1299 int index = 0;
1300 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1301
1302 // Fill in the time structure (in clocks)
1303 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1304 bufp->tms_utime = clocks;
1305 bufp->tms_stime = 0;
1306 bufp->tms_cutime = 0;
1307 bufp->tms_cstime = 0;
1308
1309 // Convert to host endianness
1310 bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1311
1312 // Write back
1313 bufp.copyOut(tc->getMemProxy());
1314
1315 // Return clock ticks since system boot
1316 return clocks;
1317}
1318
1319/// Target time() function.
1320template <class OS>
1321SyscallReturn
1322timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1323 ThreadContext *tc)
1324{
1325 typename OS::time_t sec, usec;
1326 getElapsedTime(sec, usec);
1327 sec += seconds_since_epoch;
1328
1329 int index = 0;
1330 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1331 if(taddr != 0) {
1332 typename OS::time_t t = sec;
1333 t = TheISA::htog(t);
1334 SETranslatingPortProxy &p = tc->getMemProxy();
1335 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1336 }
1337 return sec;
1338}
1339
1340
1341#endif // __SIM_SYSCALL_EMUL_HH__
| 645 // It's a proc/sys entery and requires special handling
646 fd = OS::openSpecialFile(path, process, tc);
647 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
648 } else {
649 // open the file
650 fd = open(path.c_str(), hostFlags, mode);
651 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
652 }
653
654}
655
656/// Target sysinfo() handler.
657template <class OS>
658SyscallReturn
659sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
660 ThreadContext *tc)
661{
662
663 int index = 0;
664 TypedBufferArg<typename OS::tgt_sysinfo>
665 sysinfo(process->getSyscallArg(tc, index));
666
667 sysinfo->uptime=seconds_since_epoch;
668 sysinfo->totalram=process->system->memSize();
669
670 sysinfo.copyOut(tc->getMemProxy());
671
672 return 0;
673}
674
675/// Target chmod() handler.
676template <class OS>
677SyscallReturn
678chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
679 ThreadContext *tc)
680{
681 std::string path;
682
683 int index = 0;
684 if (!tc->getMemProxy().tryReadString(path,
685 process->getSyscallArg(tc, index))) {
686 return -EFAULT;
687 }
688
689 uint32_t mode = process->getSyscallArg(tc, index);
690 mode_t hostMode = 0;
691
692 // XXX translate mode flags via OS::something???
693 hostMode = mode;
694
695 // Adjust path for current working directory
696 path = process->fullPath(path);
697
698 // do the chmod
699 int result = chmod(path.c_str(), hostMode);
700 if (result < 0)
701 return -errno;
702
703 return 0;
704}
705
706
707/// Target fchmod() handler.
708template <class OS>
709SyscallReturn
710fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
711 ThreadContext *tc)
712{
713 int index = 0;
714 int fd = process->getSyscallArg(tc, index);
715 if (fd < 0 || process->sim_fd(fd) < 0) {
716 // doesn't map to any simulator fd: not a valid target fd
717 return -EBADF;
718 }
719
720 uint32_t mode = process->getSyscallArg(tc, index);
721 mode_t hostMode = 0;
722
723 // XXX translate mode flags via OS::someting???
724 hostMode = mode;
725
726 // do the fchmod
727 int result = fchmod(process->sim_fd(fd), hostMode);
728 if (result < 0)
729 return -errno;
730
731 return 0;
732}
733
734/// Target mremap() handler.
735template <class OS>
736SyscallReturn
737mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
738{
739 int index = 0;
740 Addr start = process->getSyscallArg(tc, index);
741 uint64_t old_length = process->getSyscallArg(tc, index);
742 uint64_t new_length = process->getSyscallArg(tc, index);
743 uint64_t flags = process->getSyscallArg(tc, index);
744
745 if ((start % TheISA::VMPageSize != 0) ||
746 (new_length % TheISA::VMPageSize != 0)) {
747 warn("mremap failing: arguments not page aligned");
748 return -EINVAL;
749 }
750
751 if (new_length > old_length) {
752 if ((start + old_length) == process->mmap_end) {
753 uint64_t diff = new_length - old_length;
754 process->allocateMem(process->mmap_end, diff);
755 process->mmap_end += diff;
756 return start;
757 } else {
758 // sys/mman.h defined MREMAP_MAYMOVE
759 if (!(flags & 1)) {
760 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
761 return -ENOMEM;
762 } else {
763 process->pTable->remap(start, old_length, process->mmap_end);
764 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
765 process->mmap_end, process->mmap_end + new_length, new_length);
766 start = process->mmap_end;
767 // add on the remaining unallocated pages
768 process->allocateMem(start + old_length,
769 new_length - old_length);
770 process->mmap_end += new_length;
771 warn("returning %08p as start\n", start);
772 return start;
773 }
774 }
775 } else {
776 process->pTable->unmap(start + new_length, old_length - new_length);
777 return start;
778 }
779}
780
781/// Target stat() handler.
782template <class OS>
783SyscallReturn
784statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
785 ThreadContext *tc)
786{
787 std::string path;
788
789 int index = 0;
790 if (!tc->getMemProxy().tryReadString(path,
791 process->getSyscallArg(tc, index))) {
792 return -EFAULT;
793 }
794 Addr bufPtr = process->getSyscallArg(tc, index);
795
796 // Adjust path for current working directory
797 path = process->fullPath(path);
798
799 struct stat hostBuf;
800 int result = stat(path.c_str(), &hostBuf);
801
802 if (result < 0)
803 return -errno;
804
805 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
806
807 return 0;
808}
809
810
811/// Target stat64() handler.
812template <class OS>
813SyscallReturn
814stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
815 ThreadContext *tc)
816{
817 std::string path;
818
819 int index = 0;
820 if (!tc->getMemProxy().tryReadString(path,
821 process->getSyscallArg(tc, index)))
822 return -EFAULT;
823 Addr bufPtr = process->getSyscallArg(tc, index);
824
825 // Adjust path for current working directory
826 path = process->fullPath(path);
827
828#if NO_STAT64
829 struct stat hostBuf;
830 int result = stat(path.c_str(), &hostBuf);
831#else
832 struct stat64 hostBuf;
833 int result = stat64(path.c_str(), &hostBuf);
834#endif
835
836 if (result < 0)
837 return -errno;
838
839 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
840
841 return 0;
842}
843
844
845/// Target fstat64() handler.
846template <class OS>
847SyscallReturn
848fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
849 ThreadContext *tc)
850{
851 int index = 0;
852 int fd = process->getSyscallArg(tc, index);
853 Addr bufPtr = process->getSyscallArg(tc, index);
854 if (fd < 0 || process->sim_fd(fd) < 0) {
855 // doesn't map to any simulator fd: not a valid target fd
856 return -EBADF;
857 }
858
859#if NO_STAT64
860 struct stat hostBuf;
861 int result = fstat(process->sim_fd(fd), &hostBuf);
862#else
863 struct stat64 hostBuf;
864 int result = fstat64(process->sim_fd(fd), &hostBuf);
865#endif
866
867 if (result < 0)
868 return -errno;
869
870 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
871
872 return 0;
873}
874
875
876/// Target lstat() handler.
877template <class OS>
878SyscallReturn
879lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
880 ThreadContext *tc)
881{
882 std::string path;
883
884 int index = 0;
885 if (!tc->getMemProxy().tryReadString(path,
886 process->getSyscallArg(tc, index))) {
887 return -EFAULT;
888 }
889 Addr bufPtr = process->getSyscallArg(tc, index);
890
891 // Adjust path for current working directory
892 path = process->fullPath(path);
893
894 struct stat hostBuf;
895 int result = lstat(path.c_str(), &hostBuf);
896
897 if (result < 0)
898 return -errno;
899
900 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
901
902 return 0;
903}
904
905/// Target lstat64() handler.
906template <class OS>
907SyscallReturn
908lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
909 ThreadContext *tc)
910{
911 std::string path;
912
913 int index = 0;
914 if (!tc->getMemProxy().tryReadString(path,
915 process->getSyscallArg(tc, index))) {
916 return -EFAULT;
917 }
918 Addr bufPtr = process->getSyscallArg(tc, index);
919
920 // Adjust path for current working directory
921 path = process->fullPath(path);
922
923#if NO_STAT64
924 struct stat hostBuf;
925 int result = lstat(path.c_str(), &hostBuf);
926#else
927 struct stat64 hostBuf;
928 int result = lstat64(path.c_str(), &hostBuf);
929#endif
930
931 if (result < 0)
932 return -errno;
933
934 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
935
936 return 0;
937}
938
939/// Target fstat() handler.
940template <class OS>
941SyscallReturn
942fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
943 ThreadContext *tc)
944{
945 int index = 0;
946 int fd = process->sim_fd(process->getSyscallArg(tc, index));
947 Addr bufPtr = process->getSyscallArg(tc, index);
948
949 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
950
951 if (fd < 0)
952 return -EBADF;
953
954 struct stat hostBuf;
955 int result = fstat(fd, &hostBuf);
956
957 if (result < 0)
958 return -errno;
959
960 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
961
962 return 0;
963}
964
965
966/// Target statfs() handler.
967template <class OS>
968SyscallReturn
969statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
970 ThreadContext *tc)
971{
972 std::string path;
973
974 int index = 0;
975 if (!tc->getMemProxy().tryReadString(path,
976 process->getSyscallArg(tc, index))) {
977 return -EFAULT;
978 }
979 Addr bufPtr = process->getSyscallArg(tc, index);
980
981 // Adjust path for current working directory
982 path = process->fullPath(path);
983
984 struct statfs hostBuf;
985 int result = statfs(path.c_str(), &hostBuf);
986
987 if (result < 0)
988 return -errno;
989
990 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
991
992 return 0;
993}
994
995
996/// Target fstatfs() handler.
997template <class OS>
998SyscallReturn
999fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1000 ThreadContext *tc)
1001{
1002 int index = 0;
1003 int fd = process->sim_fd(process->getSyscallArg(tc, index));
1004 Addr bufPtr = process->getSyscallArg(tc, index);
1005
1006 if (fd < 0)
1007 return -EBADF;
1008
1009 struct statfs hostBuf;
1010 int result = fstatfs(fd, &hostBuf);
1011
1012 if (result < 0)
1013 return -errno;
1014
1015 OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1016
1017 return 0;
1018}
1019
1020
1021/// Target writev() handler.
1022template <class OS>
1023SyscallReturn
1024writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1025 ThreadContext *tc)
1026{
1027 int index = 0;
1028 int fd = process->getSyscallArg(tc, index);
1029 if (fd < 0 || process->sim_fd(fd) < 0) {
1030 // doesn't map to any simulator fd: not a valid target fd
1031 return -EBADF;
1032 }
1033
1034 SETranslatingPortProxy &p = tc->getMemProxy();
1035 uint64_t tiov_base = process->getSyscallArg(tc, index);
1036 size_t count = process->getSyscallArg(tc, index);
1037 struct iovec hiov[count];
1038 for (size_t i = 0; i < count; ++i) {
1039 typename OS::tgt_iovec tiov;
1040
1041 p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1042 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1043 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1044 hiov[i].iov_base = new char [hiov[i].iov_len];
1045 p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1046 hiov[i].iov_len);
1047 }
1048
1049 int result = writev(process->sim_fd(fd), hiov, count);
1050
1051 for (size_t i = 0; i < count; ++i)
1052 delete [] (char *)hiov[i].iov_base;
1053
1054 if (result < 0)
1055 return -errno;
1056
1057 return 0;
1058}
1059
1060
1061/// Target mmap() handler.
1062///
1063/// We don't really handle mmap(). If the target is mmaping an
1064/// anonymous region or /dev/zero, we can get away with doing basically
1065/// nothing (since memory is initialized to zero and the simulator
1066/// doesn't really check addresses anyway).
1067///
1068template <class OS>
1069SyscallReturn
1070mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1071{
1072 int index = 0;
1073 Addr start = p->getSyscallArg(tc, index);
1074 uint64_t length = p->getSyscallArg(tc, index);
1075 index++; // int prot = p->getSyscallArg(tc, index);
1076 int flags = p->getSyscallArg(tc, index);
1077 int tgt_fd = p->getSyscallArg(tc, index);
1078 // int offset = p->getSyscallArg(tc, index);
1079
1080 if (length > 0x100000000ULL)
1081 warn("mmap length argument %#x is unreasonably large.\n", length);
1082
1083 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1084 Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1085 if (!fd_map || fd_map->fd < 0) {
1086 warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1087 return -EBADF;
1088 }
1089
1090 if (fd_map->filename != "/dev/zero") {
1091 // This is very likely broken, but leave a warning here
1092 // (rather than panic) in case /dev/zero is known by
1093 // another name on some platform
1094 warn("allowing mmap of file %s; mmap not supported on files"
1095 " other than /dev/zero\n", fd_map->filename);
1096 }
1097 }
1098
1099 if ((start % TheISA::VMPageSize) != 0 ||
1100 (length % TheISA::VMPageSize) != 0) {
1101 warn("mmap failing: arguments not page-aligned: "
1102 "start 0x%x length 0x%x",
1103 start, length);
1104 return -EINVAL;
1105 }
1106
1107 // are we ok with clobbering existing mappings? only set this to
1108 // true if the user has been warned.
1109 bool clobber = false;
1110
1111 // try to use the caller-provided address if there is one
1112 bool use_provided_address = (start != 0);
1113
1114 if (use_provided_address) {
1115 // check to see if the desired address is already in use
1116 if (!p->pTable->isUnmapped(start, length)) {
1117 // there are existing mappings in the desired range
1118 // whether we clobber them or not depends on whether the caller
1119 // specified MAP_FIXED
1120 if (flags & OS::TGT_MAP_FIXED) {
1121 // MAP_FIXED specified: clobber existing mappings
1122 warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
1123 start);
1124 clobber = true;
1125 } else {
1126 // MAP_FIXED not specified: ignore suggested start address
1127 warn("mmap: ignoring suggested map address 0x%x\n", start);
1128 use_provided_address = false;
1129 }
1130 }
1131 }
1132
1133 if (!use_provided_address) {
1134 // no address provided, or provided address unusable:
1135 // pick next address from our "mmap region"
1136 if (OS::mmapGrowsDown()) {
1137 start = p->mmap_end - length;
1138 p->mmap_end = start;
1139 } else {
1140 start = p->mmap_end;
1141 p->mmap_end += length;
1142 }
1143 }
1144
1145 p->allocateMem(start, length, clobber);
1146
1147 return start;
1148}
1149
1150/// Target getrlimit() handler.
1151template <class OS>
1152SyscallReturn
1153getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1154 ThreadContext *tc)
1155{
1156 int index = 0;
1157 unsigned resource = process->getSyscallArg(tc, index);
1158 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1159
1160 switch (resource) {
1161 case OS::TGT_RLIMIT_STACK:
1162 // max stack size in bytes: make up a number (8MB for now)
1163 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1164 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1165 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1166 break;
1167
1168 case OS::TGT_RLIMIT_DATA:
1169 // max data segment size in bytes: make up a number
1170 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1171 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1172 rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1173 break;
1174
1175 default:
1176 std::cerr << "getrlimitFunc: unimplemented resource " << resource
1177 << std::endl;
1178 abort();
1179 break;
1180 }
1181
1182 rlp.copyOut(tc->getMemProxy());
1183 return 0;
1184}
1185
1186/// Target gettimeofday() handler.
1187template <class OS>
1188SyscallReturn
1189gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1190 ThreadContext *tc)
1191{
1192 int index = 0;
1193 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1194
1195 getElapsedTime(tp->tv_sec, tp->tv_usec);
1196 tp->tv_sec += seconds_since_epoch;
1197 tp->tv_sec = TheISA::htog(tp->tv_sec);
1198 tp->tv_usec = TheISA::htog(tp->tv_usec);
1199
1200 tp.copyOut(tc->getMemProxy());
1201
1202 return 0;
1203}
1204
1205
1206/// Target utimes() handler.
1207template <class OS>
1208SyscallReturn
1209utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1210 ThreadContext *tc)
1211{
1212 std::string path;
1213
1214 int index = 0;
1215 if (!tc->getMemProxy().tryReadString(path,
1216 process->getSyscallArg(tc, index))) {
1217 return -EFAULT;
1218 }
1219
1220 TypedBufferArg<typename OS::timeval [2]>
1221 tp(process->getSyscallArg(tc, index));
1222 tp.copyIn(tc->getMemProxy());
1223
1224 struct timeval hostTimeval[2];
1225 for (int i = 0; i < 2; ++i)
1226 {
1227 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1228 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1229 }
1230
1231 // Adjust path for current working directory
1232 path = process->fullPath(path);
1233
1234 int result = utimes(path.c_str(), hostTimeval);
1235
1236 if (result < 0)
1237 return -errno;
1238
1239 return 0;
1240}
1241/// Target getrusage() function.
1242template <class OS>
1243SyscallReturn
1244getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1245 ThreadContext *tc)
1246{
1247 int index = 0;
1248 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1249 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1250
1251 rup->ru_utime.tv_sec = 0;
1252 rup->ru_utime.tv_usec = 0;
1253 rup->ru_stime.tv_sec = 0;
1254 rup->ru_stime.tv_usec = 0;
1255 rup->ru_maxrss = 0;
1256 rup->ru_ixrss = 0;
1257 rup->ru_idrss = 0;
1258 rup->ru_isrss = 0;
1259 rup->ru_minflt = 0;
1260 rup->ru_majflt = 0;
1261 rup->ru_nswap = 0;
1262 rup->ru_inblock = 0;
1263 rup->ru_oublock = 0;
1264 rup->ru_msgsnd = 0;
1265 rup->ru_msgrcv = 0;
1266 rup->ru_nsignals = 0;
1267 rup->ru_nvcsw = 0;
1268 rup->ru_nivcsw = 0;
1269
1270 switch (who) {
1271 case OS::TGT_RUSAGE_SELF:
1272 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1273 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1274 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1275 break;
1276
1277 case OS::TGT_RUSAGE_CHILDREN:
1278 // do nothing. We have no child processes, so they take no time.
1279 break;
1280
1281 default:
1282 // don't really handle THREAD or CHILDREN, but just warn and
1283 // plow ahead
1284 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1285 who);
1286 }
1287
1288 rup.copyOut(tc->getMemProxy());
1289
1290 return 0;
1291}
1292
1293/// Target times() function.
1294template <class OS>
1295SyscallReturn
1296timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1297 ThreadContext *tc)
1298{
1299 int index = 0;
1300 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1301
1302 // Fill in the time structure (in clocks)
1303 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1304 bufp->tms_utime = clocks;
1305 bufp->tms_stime = 0;
1306 bufp->tms_cutime = 0;
1307 bufp->tms_cstime = 0;
1308
1309 // Convert to host endianness
1310 bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1311
1312 // Write back
1313 bufp.copyOut(tc->getMemProxy());
1314
1315 // Return clock ticks since system boot
1316 return clocks;
1317}
1318
1319/// Target time() function.
1320template <class OS>
1321SyscallReturn
1322timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1323 ThreadContext *tc)
1324{
1325 typename OS::time_t sec, usec;
1326 getElapsedTime(sec, usec);
1327 sec += seconds_since_epoch;
1328
1329 int index = 0;
1330 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1331 if(taddr != 0) {
1332 typename OS::time_t t = sec;
1333 t = TheISA::htog(t);
1334 SETranslatingPortProxy &p = tc->getMemProxy();
1335 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1336 }
1337 return sec;
1338}
1339
1340
1341#endif // __SIM_SYSCALL_EMUL_HH__
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