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 BSD_HOST (defined(__APPLE__) || defined(__OpenBSD__) || \
36 defined(__FreeBSD__))
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/uio.h>
50
51#include "arch/isa_traits.hh" // for Addr
52#include "base/chunk_generator.hh"
53#include "base/intmath.hh" // for RoundUp
54#include "base/misc.hh"
55#include "base/trace.hh"
56#include "cpu/base.hh"
57#include "cpu/thread_context.hh"
58#include "mem/translating_port.hh"
59#include "mem/page_table.hh"
60#include "sim/process.hh"
61
62///
63/// System call descriptor.
64///
65class SyscallDesc {
66
67 public:
68
69 /// Typedef for target syscall handler functions.
70 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
71 Process *, ThreadContext *);
72
73 const char *name; //!< Syscall name (e.g., "open").
74 FuncPtr funcPtr; //!< Pointer to emulation function.
75 int flags; //!< Flags (see Flags enum).
76
77 /// Flag values for controlling syscall behavior.
78 enum Flags {
79 /// Don't set return regs according to funcPtr return value.
80 /// Used for syscalls with non-standard return conventions
81 /// that explicitly set the ThreadContext regs (e.g.,
82 /// sigreturn).
83 SuppressReturnValue = 1
84 };
85
86 /// Constructor.
87 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
88 : name(_name), funcPtr(_funcPtr), flags(_flags)
89 {
90 }
91
92 /// Emulate the syscall. Public interface for calling through funcPtr.
93 void doSyscall(int callnum, Process *proc, ThreadContext *tc);
94};
95
96
97class BaseBufferArg {
98
99 public:
100
101 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
102 {
103 bufPtr = new uint8_t[size];
104 // clear out buffer: in case we only partially populate this,
105 // and then do a copyOut(), we want to make sure we don't
106 // introduce any random junk into the simulated address space
107 memset(bufPtr, 0, size);
108 }
109
110 virtual ~BaseBufferArg() { delete [] bufPtr; }
111
112 //
113 // copy data into simulator space (read from target memory)
114 //
115 virtual bool copyIn(TranslatingPort *memport)
116 {
117 memport->readBlob(addr, bufPtr, size);
118 return true; // no EFAULT detection for now
119 }
120
121 //
122 // copy data out of simulator space (write to target memory)
123 //
124 virtual bool copyOut(TranslatingPort *memport)
125 {
126 memport->writeBlob(addr, bufPtr, size);
127 return true; // no EFAULT detection for now
128 }
129
130 protected:
131 Addr addr;
132 int size;
133 uint8_t *bufPtr;
134};
135
136
137class BufferArg : public BaseBufferArg
138{
139 public:
140 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
141 void *bufferPtr() { return bufPtr; }
142};
143
144template <class T>
145class TypedBufferArg : public BaseBufferArg
146{
147 public:
148 // user can optionally specify a specific number of bytes to
149 // allocate to deal with those structs that have variable-size
150 // arrays at the end
151 TypedBufferArg(Addr _addr, int _size = sizeof(T))
152 : BaseBufferArg(_addr, _size)
153 { }
154
155 // type case
156 operator T*() { return (T *)bufPtr; }
157
158 // dereference operators
159 T &operator*() { return *((T *)bufPtr); }
160 T* operator->() { return (T *)bufPtr; }
161 T &operator[](int i) { return ((T *)bufPtr)[i]; }
162};
163
164//////////////////////////////////////////////////////////////////////
165//
166// The following emulation functions are generic enough that they
167// don't need to be recompiled for different emulated OS's. They are
168// defined in sim/syscall_emul.cc.
169//
170//////////////////////////////////////////////////////////////////////
171
172
173/// Handler for unimplemented syscalls that we haven't thought about.
174SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
175 Process *p, ThreadContext *tc);
176
177/// Handler for unimplemented syscalls that we never intend to
178/// implement (signal handling, etc.) and should not affect the correct
179/// behavior of the program. Print a warning only if the appropriate
180/// trace flag is enabled. Return success to the target program.
181SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
182 Process *p, ThreadContext *tc);
183
184/// Target exit() handler: terminate simulation.
185SyscallReturn exitFunc(SyscallDesc *desc, int num,
186 Process *p, ThreadContext *tc);
187
188/// Target getpagesize() handler.
189SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
190 Process *p, ThreadContext *tc);
191
192/// Target obreak() handler: set brk address.
193SyscallReturn obreakFunc(SyscallDesc *desc, int num,
194 Process *p, ThreadContext *tc);
195
196/// Target close() handler.
197SyscallReturn closeFunc(SyscallDesc *desc, int num,
198 Process *p, ThreadContext *tc);
199
200/// Target read() handler.
201SyscallReturn readFunc(SyscallDesc *desc, int num,
202 Process *p, ThreadContext *tc);
203
204/// Target write() handler.
205SyscallReturn writeFunc(SyscallDesc *desc, int num,
206 Process *p, ThreadContext *tc);
207
208/// Target lseek() handler.
209SyscallReturn lseekFunc(SyscallDesc *desc, int num,
210 Process *p, ThreadContext *tc);
211
212/// Target munmap() handler.
213SyscallReturn munmapFunc(SyscallDesc *desc, int num,
214 Process *p, ThreadContext *tc);
215
216/// Target gethostname() handler.
217SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
218 Process *p, ThreadContext *tc);
219
220/// Target unlink() handler.
221SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
222 Process *p, ThreadContext *tc);
223
224/// Target rename() handler.
225SyscallReturn renameFunc(SyscallDesc *desc, int num,
226 Process *p, ThreadContext *tc);
227
228
229/// Target truncate() handler.
230SyscallReturn truncateFunc(SyscallDesc *desc, int num,
231 Process *p, ThreadContext *tc);
232
233
234/// Target ftruncate() handler.
235SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
236 Process *p, ThreadContext *tc);
237
238
239/// Target chown() handler.
240SyscallReturn chownFunc(SyscallDesc *desc, int num,
241 Process *p, ThreadContext *tc);
242
243
244/// Target fchown() handler.
245SyscallReturn fchownFunc(SyscallDesc *desc, int num,
246 Process *p, ThreadContext *tc);
247
248/// Target fnctl() handler.
249SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
250 Process *process, ThreadContext *tc);
251
| 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 BSD_HOST (defined(__APPLE__) || defined(__OpenBSD__) || \
36 defined(__FreeBSD__))
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/uio.h>
50
51#include "arch/isa_traits.hh" // for Addr
52#include "base/chunk_generator.hh"
53#include "base/intmath.hh" // for RoundUp
54#include "base/misc.hh"
55#include "base/trace.hh"
56#include "cpu/base.hh"
57#include "cpu/thread_context.hh"
58#include "mem/translating_port.hh"
59#include "mem/page_table.hh"
60#include "sim/process.hh"
61
62///
63/// System call descriptor.
64///
65class SyscallDesc {
66
67 public:
68
69 /// Typedef for target syscall handler functions.
70 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
71 Process *, ThreadContext *);
72
73 const char *name; //!< Syscall name (e.g., "open").
74 FuncPtr funcPtr; //!< Pointer to emulation function.
75 int flags; //!< Flags (see Flags enum).
76
77 /// Flag values for controlling syscall behavior.
78 enum Flags {
79 /// Don't set return regs according to funcPtr return value.
80 /// Used for syscalls with non-standard return conventions
81 /// that explicitly set the ThreadContext regs (e.g.,
82 /// sigreturn).
83 SuppressReturnValue = 1
84 };
85
86 /// Constructor.
87 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
88 : name(_name), funcPtr(_funcPtr), flags(_flags)
89 {
90 }
91
92 /// Emulate the syscall. Public interface for calling through funcPtr.
93 void doSyscall(int callnum, Process *proc, ThreadContext *tc);
94};
95
96
97class BaseBufferArg {
98
99 public:
100
101 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
102 {
103 bufPtr = new uint8_t[size];
104 // clear out buffer: in case we only partially populate this,
105 // and then do a copyOut(), we want to make sure we don't
106 // introduce any random junk into the simulated address space
107 memset(bufPtr, 0, size);
108 }
109
110 virtual ~BaseBufferArg() { delete [] bufPtr; }
111
112 //
113 // copy data into simulator space (read from target memory)
114 //
115 virtual bool copyIn(TranslatingPort *memport)
116 {
117 memport->readBlob(addr, bufPtr, size);
118 return true; // no EFAULT detection for now
119 }
120
121 //
122 // copy data out of simulator space (write to target memory)
123 //
124 virtual bool copyOut(TranslatingPort *memport)
125 {
126 memport->writeBlob(addr, bufPtr, size);
127 return true; // no EFAULT detection for now
128 }
129
130 protected:
131 Addr addr;
132 int size;
133 uint8_t *bufPtr;
134};
135
136
137class BufferArg : public BaseBufferArg
138{
139 public:
140 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
141 void *bufferPtr() { return bufPtr; }
142};
143
144template <class T>
145class TypedBufferArg : public BaseBufferArg
146{
147 public:
148 // user can optionally specify a specific number of bytes to
149 // allocate to deal with those structs that have variable-size
150 // arrays at the end
151 TypedBufferArg(Addr _addr, int _size = sizeof(T))
152 : BaseBufferArg(_addr, _size)
153 { }
154
155 // type case
156 operator T*() { return (T *)bufPtr; }
157
158 // dereference operators
159 T &operator*() { return *((T *)bufPtr); }
160 T* operator->() { return (T *)bufPtr; }
161 T &operator[](int i) { return ((T *)bufPtr)[i]; }
162};
163
164//////////////////////////////////////////////////////////////////////
165//
166// The following emulation functions are generic enough that they
167// don't need to be recompiled for different emulated OS's. They are
168// defined in sim/syscall_emul.cc.
169//
170//////////////////////////////////////////////////////////////////////
171
172
173/// Handler for unimplemented syscalls that we haven't thought about.
174SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
175 Process *p, ThreadContext *tc);
176
177/// Handler for unimplemented syscalls that we never intend to
178/// implement (signal handling, etc.) and should not affect the correct
179/// behavior of the program. Print a warning only if the appropriate
180/// trace flag is enabled. Return success to the target program.
181SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
182 Process *p, ThreadContext *tc);
183
184/// Target exit() handler: terminate simulation.
185SyscallReturn exitFunc(SyscallDesc *desc, int num,
186 Process *p, ThreadContext *tc);
187
188/// Target getpagesize() handler.
189SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
190 Process *p, ThreadContext *tc);
191
192/// Target obreak() handler: set brk address.
193SyscallReturn obreakFunc(SyscallDesc *desc, int num,
194 Process *p, ThreadContext *tc);
195
196/// Target close() handler.
197SyscallReturn closeFunc(SyscallDesc *desc, int num,
198 Process *p, ThreadContext *tc);
199
200/// Target read() handler.
201SyscallReturn readFunc(SyscallDesc *desc, int num,
202 Process *p, ThreadContext *tc);
203
204/// Target write() handler.
205SyscallReturn writeFunc(SyscallDesc *desc, int num,
206 Process *p, ThreadContext *tc);
207
208/// Target lseek() handler.
209SyscallReturn lseekFunc(SyscallDesc *desc, int num,
210 Process *p, ThreadContext *tc);
211
212/// Target munmap() handler.
213SyscallReturn munmapFunc(SyscallDesc *desc, int num,
214 Process *p, ThreadContext *tc);
215
216/// Target gethostname() handler.
217SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
218 Process *p, ThreadContext *tc);
219
220/// Target unlink() handler.
221SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
222 Process *p, ThreadContext *tc);
223
224/// Target rename() handler.
225SyscallReturn renameFunc(SyscallDesc *desc, int num,
226 Process *p, ThreadContext *tc);
227
228
229/// Target truncate() handler.
230SyscallReturn truncateFunc(SyscallDesc *desc, int num,
231 Process *p, ThreadContext *tc);
232
233
234/// Target ftruncate() handler.
235SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
236 Process *p, ThreadContext *tc);
237
238
239/// Target chown() handler.
240SyscallReturn chownFunc(SyscallDesc *desc, int num,
241 Process *p, ThreadContext *tc);
242
243
244/// Target fchown() handler.
245SyscallReturn fchownFunc(SyscallDesc *desc, int num,
246 Process *p, ThreadContext *tc);
247
248/// Target fnctl() handler.
249SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
250 Process *process, ThreadContext *tc);
251
|
252/// Target setuid() handler.
253SyscallReturn setuidFunc(SyscallDesc *desc, int num,
254 Process *p, ThreadContext *tc);
255
256/// Target getpid() handler.
257SyscallReturn getpidFunc(SyscallDesc *desc, int num,
258 Process *p, ThreadContext *tc);
259
260/// Target getuid() handler.
261SyscallReturn getuidFunc(SyscallDesc *desc, int num,
262 Process *p, ThreadContext *tc);
263
264/// Target getgid() handler.
265SyscallReturn getgidFunc(SyscallDesc *desc, int num,
266 Process *p, ThreadContext *tc);
267
268/// Target getppid() handler.
269SyscallReturn getppidFunc(SyscallDesc *desc, int num,
270 Process *p, ThreadContext *tc);
271
272/// Target geteuid() handler.
273SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
274 Process *p, ThreadContext *tc);
275
276/// Target getegid() handler.
277SyscallReturn getegidFunc(SyscallDesc *desc, int num,
278 Process *p, ThreadContext *tc);
279
280
281
282/// Pseudo Funcs - These functions use a different return convension,
283/// returning a second value in a register other than the normal return register
284SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
285 Process *process, ThreadContext *tc);
286
287/// Target getpidPseudo() handler.
288SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
289 Process *p, ThreadContext *tc);
290
291/// Target getuidPseudo() handler.
292SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
293 Process *p, ThreadContext *tc);
294
295/// Target getgidPseudo() handler.
296SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
297 Process *p, ThreadContext *tc);
298
299
300/// This struct is used to build an target-OS-dependent table that
301/// maps the target's open() flags to the host open() flags.
302struct OpenFlagTransTable {
303 int tgtFlag; //!< Target system flag value.
304 int hostFlag; //!< Corresponding host system flag value.
305};
306
307
308
309/// A readable name for 1,000,000, for converting microseconds to seconds.
310const int one_million = 1000000;
311
312/// Approximate seconds since the epoch (1/1/1970). About a billion,
313/// by my reckoning. We want to keep this a constant (not use the
314/// real-world time) to keep simulations repeatable.
315const unsigned seconds_since_epoch = 1000000000;
316
317/// Helper function to convert current elapsed time to seconds and
318/// microseconds.
319template <class T1, class T2>
320void
321getElapsedTime(T1 &sec, T2 &usec)
322{
323 int elapsed_usecs = curTick / Clock::Int::us;
324 sec = elapsed_usecs / one_million;
325 usec = elapsed_usecs % one_million;
326}
327
328//////////////////////////////////////////////////////////////////////
329//
330// The following emulation functions are generic, but need to be
331// templated to account for differences in types, constants, etc.
332//
333//////////////////////////////////////////////////////////////////////
334
335/// Target ioctl() handler. For the most part, programs call ioctl()
336/// only to find out if their stdout is a tty, to determine whether to
337/// do line or block buffering.
338template <class OS>
339SyscallReturn
340ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
341 ThreadContext *tc)
342{
343 int fd = tc->getSyscallArg(0);
344 unsigned req = tc->getSyscallArg(1);
345
346 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
347
348 if (fd < 0 || process->sim_fd(fd) < 0) {
349 // doesn't map to any simulator fd: not a valid target fd
350 return -EBADF;
351 }
352
353 switch (req) {
354 case OS::TIOCISATTY:
355 case OS::TIOCGETP:
356 case OS::TIOCSETP:
357 case OS::TIOCSETN:
358 case OS::TIOCSETC:
359 case OS::TIOCGETC:
360 case OS::TIOCGETS:
361 case OS::TIOCGETA:
362 return -ENOTTY;
363
364 default:
365 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
366 fd, req, tc->readPC());
367 }
368}
369
370/// Target open() handler.
371template <class OS>
372SyscallReturn
373openFunc(SyscallDesc *desc, int callnum, Process *process,
374 ThreadContext *tc)
375{
376 std::string path;
377
378 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
379 return -EFAULT;
380
381 if (path == "/dev/sysdev0") {
382 // This is a memory-mapped high-resolution timer device on Alpha.
383 // We don't support it, so just punt.
384 warn("Ignoring open(%s, ...)\n", path);
385 return -ENOENT;
386 }
387
388 int tgtFlags = tc->getSyscallArg(1);
389 int mode = tc->getSyscallArg(2);
390 int hostFlags = 0;
391
392 // translate open flags
393 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
394 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
395 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
396 hostFlags |= OS::openFlagTable[i].hostFlag;
397 }
398 }
399
400 // any target flags left?
401 if (tgtFlags != 0)
402 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
403
404#ifdef __CYGWIN32__
405 hostFlags |= O_BINARY;
406#endif
407
408 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
409
410 // open the file
411 int fd = open(path.c_str(), hostFlags, mode);
412
413 return (fd == -1) ? -errno : process->alloc_fd(fd);
414}
415
416
417/// Target chmod() handler.
418template <class OS>
419SyscallReturn
420chmodFunc(SyscallDesc *desc, int callnum, Process *process,
421 ThreadContext *tc)
422{
423 std::string path;
424
425 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
426 return -EFAULT;
427
428 uint32_t mode = tc->getSyscallArg(1);
429 mode_t hostMode = 0;
430
431 // XXX translate mode flags via OS::something???
432 hostMode = mode;
433
434 // do the chmod
435 int result = chmod(path.c_str(), hostMode);
436 if (result < 0)
437 return -errno;
438
439 return 0;
440}
441
442
443/// Target fchmod() handler.
444template <class OS>
445SyscallReturn
446fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
447 ThreadContext *tc)
448{
449 int fd = tc->getSyscallArg(0);
450 if (fd < 0 || process->sim_fd(fd) < 0) {
451 // doesn't map to any simulator fd: not a valid target fd
452 return -EBADF;
453 }
454
455 uint32_t mode = tc->getSyscallArg(1);
456 mode_t hostMode = 0;
457
458 // XXX translate mode flags via OS::someting???
459 hostMode = mode;
460
461 // do the fchmod
462 int result = fchmod(process->sim_fd(fd), hostMode);
463 if (result < 0)
464 return -errno;
465
466 return 0;
467}
468
469
470/// Target stat() handler.
471template <class OS>
472SyscallReturn
473statFunc(SyscallDesc *desc, int callnum, Process *process,
474 ThreadContext *tc)
475{
476 std::string path;
477
478 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
479 return -EFAULT;
480
481 struct stat hostBuf;
482 int result = stat(path.c_str(), &hostBuf);
483
484 if (result < 0)
485 return -errno;
486
487 OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
488
489 return 0;
490}
491
492
493/// Target fstat64() handler.
494template <class OS>
495SyscallReturn
496fstat64Func(SyscallDesc *desc, int callnum, Process *process,
497 ThreadContext *tc)
498{
499 int fd = tc->getSyscallArg(0);
500 if (fd < 0 || process->sim_fd(fd) < 0) {
501 // doesn't map to any simulator fd: not a valid target fd
502 return -EBADF;
503 }
504
505#if BSD_HOST
506 struct stat hostBuf;
507 int result = fstat(process->sim_fd(fd), &hostBuf);
508#else
509 struct stat64 hostBuf;
510 int result = fstat64(process->sim_fd(fd), &hostBuf);
511#endif
512
513 if (result < 0)
514 return -errno;
515
516 OS::copyOutStat64Buf(tc->getMemPort(), fd, tc->getSyscallArg(1), &hostBuf);
517
518 return 0;
519}
520
521
522/// Target lstat() handler.
523template <class OS>
524SyscallReturn
525lstatFunc(SyscallDesc *desc, int callnum, Process *process,
526 ThreadContext *tc)
527{
528 std::string path;
529
530 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
531 return -EFAULT;
532
533 struct stat hostBuf;
534 int result = lstat(path.c_str(), &hostBuf);
535
536 if (result < 0)
537 return -errno;
538
539 OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
540
541 return 0;
542}
543
544/// Target lstat64() handler.
545template <class OS>
546SyscallReturn
547lstat64Func(SyscallDesc *desc, int callnum, Process *process,
548 ThreadContext *tc)
549{
550 std::string path;
551
552 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
553 return -EFAULT;
554
555#if BSD_HOST
556 struct stat hostBuf;
557 int result = lstat(path.c_str(), &hostBuf);
558#else
559 struct stat64 hostBuf;
560 int result = lstat64(path.c_str(), &hostBuf);
561#endif
562
563 if (result < 0)
564 return -errno;
565
566 OS::copyOutStat64Buf(tc->getMemPort(), -1, tc->getSyscallArg(1), &hostBuf);
567
568 return 0;
569}
570
571/// Target fstat() handler.
572template <class OS>
573SyscallReturn
574fstatFunc(SyscallDesc *desc, int callnum, Process *process,
575 ThreadContext *tc)
576{
577 int fd = process->sim_fd(tc->getSyscallArg(0));
578
579 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
580
581 if (fd < 0)
582 return -EBADF;
583
584 struct stat hostBuf;
585 int result = fstat(fd, &hostBuf);
586
587 if (result < 0)
588 return -errno;
589
590 OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
591
592 return 0;
593}
594
595
596/// Target statfs() handler.
597template <class OS>
598SyscallReturn
599statfsFunc(SyscallDesc *desc, int callnum, Process *process,
600 ThreadContext *tc)
601{
602 std::string path;
603
604 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
605 return -EFAULT;
606
607 struct statfs hostBuf;
608 int result = statfs(path.c_str(), &hostBuf);
609
610 if (result < 0)
611 return -errno;
612
613 OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
614
615 return 0;
616}
617
618
619/// Target fstatfs() handler.
620template <class OS>
621SyscallReturn
622fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
623 ThreadContext *tc)
624{
625 int fd = process->sim_fd(tc->getSyscallArg(0));
626
627 if (fd < 0)
628 return -EBADF;
629
630 struct statfs hostBuf;
631 int result = fstatfs(fd, &hostBuf);
632
633 if (result < 0)
634 return -errno;
635
636 OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
637
638 return 0;
639}
640
641
642/// Target writev() handler.
643template <class OS>
644SyscallReturn
645writevFunc(SyscallDesc *desc, int callnum, Process *process,
646 ThreadContext *tc)
647{
648 int fd = tc->getSyscallArg(0);
649 if (fd < 0 || process->sim_fd(fd) < 0) {
650 // doesn't map to any simulator fd: not a valid target fd
651 return -EBADF;
652 }
653
654 TranslatingPort *p = tc->getMemPort();
655 uint64_t tiov_base = tc->getSyscallArg(1);
656 size_t count = tc->getSyscallArg(2);
657 struct iovec hiov[count];
658 for (int i = 0; i < count; ++i)
659 {
660 typename OS::tgt_iovec tiov;
661
662 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
663 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
664 hiov[i].iov_len = gtoh(tiov.iov_len);
665 hiov[i].iov_base = new char [hiov[i].iov_len];
666 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
667 hiov[i].iov_len);
668 }
669
670 int result = writev(process->sim_fd(fd), hiov, count);
671
672 for (int i = 0; i < count; ++i)
673 {
674 delete [] (char *)hiov[i].iov_base;
675 }
676
677 if (result < 0)
678 return -errno;
679
680 return 0;
681}
682
683
684/// Target mmap() handler.
685///
686/// We don't really handle mmap(). If the target is mmaping an
687/// anonymous region or /dev/zero, we can get away with doing basically
688/// nothing (since memory is initialized to zero and the simulator
689/// doesn't really check addresses anyway). Always print a warning,
690/// since this could be seriously broken if we're not mapping
691/// /dev/zero.
692//
693/// Someday we should explicitly check for /dev/zero in open, flag the
694/// file descriptor, and fail (or implement!) a non-anonymous mmap to
695/// anything else.
696template <class OS>
697SyscallReturn
698mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
699{
700 Addr start = tc->getSyscallArg(0);
701 uint64_t length = tc->getSyscallArg(1);
702 // int prot = tc->getSyscallArg(2);
703 int flags = tc->getSyscallArg(3);
704 // int fd = p->sim_fd(tc->getSyscallArg(4));
705 // int offset = tc->getSyscallArg(5);
706
707 if ((start % TheISA::VMPageSize) != 0 ||
708 (length % TheISA::VMPageSize) != 0) {
709 warn("mmap failing: arguments not page-aligned: "
710 "start 0x%x length 0x%x",
711 start, length);
712 return -EINVAL;
713 }
714
715 if (start != 0) {
716 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
717 start, p->mmap_end);
718 }
719
720 // pick next address from our "mmap region"
721 start = p->mmap_end;
722 p->pTable->allocate(start, length);
723 p->mmap_end += length;
724
725 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
726 warn("allowing mmap of file @ fd %d. "
727 "This will break if not /dev/zero.", tc->getSyscallArg(4));
728 }
729
730 return start;
731}
732
733/// Target getrlimit() handler.
734template <class OS>
735SyscallReturn
736getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
737 ThreadContext *tc)
738{
739 unsigned resource = tc->getSyscallArg(0);
740 TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
741
742 switch (resource) {
743 case OS::TGT_RLIMIT_STACK:
744 // max stack size in bytes: make up a number (2MB for now)
745 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
746 rlp->rlim_cur = htog(rlp->rlim_cur);
747 rlp->rlim_max = htog(rlp->rlim_max);
748 break;
749
750 default:
751 std::cerr << "getrlimitFunc: unimplemented resource " << resource
752 << std::endl;
753 abort();
754 break;
755 }
756
757 rlp.copyOut(tc->getMemPort());
758 return 0;
759}
760
761/// Target gettimeofday() handler.
762template <class OS>
763SyscallReturn
764gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
765 ThreadContext *tc)
766{
767 TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
768
769 getElapsedTime(tp->tv_sec, tp->tv_usec);
770 tp->tv_sec += seconds_since_epoch;
771 tp->tv_sec = htog(tp->tv_sec);
772 tp->tv_usec = htog(tp->tv_usec);
773
774 tp.copyOut(tc->getMemPort());
775
776 return 0;
777}
778
779
780/// Target utimes() handler.
781template <class OS>
782SyscallReturn
783utimesFunc(SyscallDesc *desc, int callnum, Process *process,
784 ThreadContext *tc)
785{
786 std::string path;
787
788 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
789 return -EFAULT;
790
791 TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
792 tp.copyIn(tc->getMemPort());
793
794 struct timeval hostTimeval[2];
795 for (int i = 0; i < 2; ++i)
796 {
797 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
798 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
799 }
800 int result = utimes(path.c_str(), hostTimeval);
801
802 if (result < 0)
803 return -errno;
804
805 return 0;
806}
807/// Target getrusage() function.
808template <class OS>
809SyscallReturn
810getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
811 ThreadContext *tc)
812{
813 int who = tc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
814 TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
815
816 if (who != OS::TGT_RUSAGE_SELF) {
817 // don't really handle THREAD or CHILDREN, but just warn and
818 // plow ahead
819 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
820 who);
821 }
822
823 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
824 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
825 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
826
827 rup->ru_stime.tv_sec = 0;
828 rup->ru_stime.tv_usec = 0;
829 rup->ru_maxrss = 0;
830 rup->ru_ixrss = 0;
831 rup->ru_idrss = 0;
832 rup->ru_isrss = 0;
833 rup->ru_minflt = 0;
834 rup->ru_majflt = 0;
835 rup->ru_nswap = 0;
836 rup->ru_inblock = 0;
837 rup->ru_oublock = 0;
838 rup->ru_msgsnd = 0;
839 rup->ru_msgrcv = 0;
840 rup->ru_nsignals = 0;
841 rup->ru_nvcsw = 0;
842 rup->ru_nivcsw = 0;
843
844 rup.copyOut(tc->getMemPort());
845
846 return 0;
847}
848
849
850
851
852#endif // __SIM_SYSCALL_EMUL_HH__
| 256/// Target setuid() handler.
257SyscallReturn setuidFunc(SyscallDesc *desc, int num,
258 Process *p, ThreadContext *tc);
259
260/// Target getpid() handler.
261SyscallReturn getpidFunc(SyscallDesc *desc, int num,
262 Process *p, ThreadContext *tc);
263
264/// Target getuid() handler.
265SyscallReturn getuidFunc(SyscallDesc *desc, int num,
266 Process *p, ThreadContext *tc);
267
268/// Target getgid() handler.
269SyscallReturn getgidFunc(SyscallDesc *desc, int num,
270 Process *p, ThreadContext *tc);
271
272/// Target getppid() handler.
273SyscallReturn getppidFunc(SyscallDesc *desc, int num,
274 Process *p, ThreadContext *tc);
275
276/// Target geteuid() handler.
277SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
278 Process *p, ThreadContext *tc);
279
280/// Target getegid() handler.
281SyscallReturn getegidFunc(SyscallDesc *desc, int num,
282 Process *p, ThreadContext *tc);
283
284
285
286/// Pseudo Funcs - These functions use a different return convension,
287/// returning a second value in a register other than the normal return register
288SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
289 Process *process, ThreadContext *tc);
290
291/// Target getpidPseudo() handler.
292SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
293 Process *p, ThreadContext *tc);
294
295/// Target getuidPseudo() handler.
296SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
297 Process *p, ThreadContext *tc);
298
299/// Target getgidPseudo() handler.
300SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
301 Process *p, ThreadContext *tc);
302
303
304/// This struct is used to build an target-OS-dependent table that
305/// maps the target's open() flags to the host open() flags.
306struct OpenFlagTransTable {
307 int tgtFlag; //!< Target system flag value.
308 int hostFlag; //!< Corresponding host system flag value.
309};
310
311
312
313/// A readable name for 1,000,000, for converting microseconds to seconds.
314const int one_million = 1000000;
315
316/// Approximate seconds since the epoch (1/1/1970). About a billion,
317/// by my reckoning. We want to keep this a constant (not use the
318/// real-world time) to keep simulations repeatable.
319const unsigned seconds_since_epoch = 1000000000;
320
321/// Helper function to convert current elapsed time to seconds and
322/// microseconds.
323template <class T1, class T2>
324void
325getElapsedTime(T1 &sec, T2 &usec)
326{
327 int elapsed_usecs = curTick / Clock::Int::us;
328 sec = elapsed_usecs / one_million;
329 usec = elapsed_usecs % one_million;
330}
331
332//////////////////////////////////////////////////////////////////////
333//
334// The following emulation functions are generic, but need to be
335// templated to account for differences in types, constants, etc.
336//
337//////////////////////////////////////////////////////////////////////
338
339/// Target ioctl() handler. For the most part, programs call ioctl()
340/// only to find out if their stdout is a tty, to determine whether to
341/// do line or block buffering.
342template <class OS>
343SyscallReturn
344ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
345 ThreadContext *tc)
346{
347 int fd = tc->getSyscallArg(0);
348 unsigned req = tc->getSyscallArg(1);
349
350 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
351
352 if (fd < 0 || process->sim_fd(fd) < 0) {
353 // doesn't map to any simulator fd: not a valid target fd
354 return -EBADF;
355 }
356
357 switch (req) {
358 case OS::TIOCISATTY:
359 case OS::TIOCGETP:
360 case OS::TIOCSETP:
361 case OS::TIOCSETN:
362 case OS::TIOCSETC:
363 case OS::TIOCGETC:
364 case OS::TIOCGETS:
365 case OS::TIOCGETA:
366 return -ENOTTY;
367
368 default:
369 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
370 fd, req, tc->readPC());
371 }
372}
373
374/// Target open() handler.
375template <class OS>
376SyscallReturn
377openFunc(SyscallDesc *desc, int callnum, Process *process,
378 ThreadContext *tc)
379{
380 std::string path;
381
382 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
383 return -EFAULT;
384
385 if (path == "/dev/sysdev0") {
386 // This is a memory-mapped high-resolution timer device on Alpha.
387 // We don't support it, so just punt.
388 warn("Ignoring open(%s, ...)\n", path);
389 return -ENOENT;
390 }
391
392 int tgtFlags = tc->getSyscallArg(1);
393 int mode = tc->getSyscallArg(2);
394 int hostFlags = 0;
395
396 // translate open flags
397 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
398 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
399 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
400 hostFlags |= OS::openFlagTable[i].hostFlag;
401 }
402 }
403
404 // any target flags left?
405 if (tgtFlags != 0)
406 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
407
408#ifdef __CYGWIN32__
409 hostFlags |= O_BINARY;
410#endif
411
412 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
413
414 // open the file
415 int fd = open(path.c_str(), hostFlags, mode);
416
417 return (fd == -1) ? -errno : process->alloc_fd(fd);
418}
419
420
421/// Target chmod() handler.
422template <class OS>
423SyscallReturn
424chmodFunc(SyscallDesc *desc, int callnum, Process *process,
425 ThreadContext *tc)
426{
427 std::string path;
428
429 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
430 return -EFAULT;
431
432 uint32_t mode = tc->getSyscallArg(1);
433 mode_t hostMode = 0;
434
435 // XXX translate mode flags via OS::something???
436 hostMode = mode;
437
438 // do the chmod
439 int result = chmod(path.c_str(), hostMode);
440 if (result < 0)
441 return -errno;
442
443 return 0;
444}
445
446
447/// Target fchmod() handler.
448template <class OS>
449SyscallReturn
450fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
451 ThreadContext *tc)
452{
453 int fd = tc->getSyscallArg(0);
454 if (fd < 0 || process->sim_fd(fd) < 0) {
455 // doesn't map to any simulator fd: not a valid target fd
456 return -EBADF;
457 }
458
459 uint32_t mode = tc->getSyscallArg(1);
460 mode_t hostMode = 0;
461
462 // XXX translate mode flags via OS::someting???
463 hostMode = mode;
464
465 // do the fchmod
466 int result = fchmod(process->sim_fd(fd), hostMode);
467 if (result < 0)
468 return -errno;
469
470 return 0;
471}
472
473
474/// Target stat() handler.
475template <class OS>
476SyscallReturn
477statFunc(SyscallDesc *desc, int callnum, Process *process,
478 ThreadContext *tc)
479{
480 std::string path;
481
482 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
483 return -EFAULT;
484
485 struct stat hostBuf;
486 int result = stat(path.c_str(), &hostBuf);
487
488 if (result < 0)
489 return -errno;
490
491 OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
492
493 return 0;
494}
495
496
497/// Target fstat64() handler.
498template <class OS>
499SyscallReturn
500fstat64Func(SyscallDesc *desc, int callnum, Process *process,
501 ThreadContext *tc)
502{
503 int fd = tc->getSyscallArg(0);
504 if (fd < 0 || process->sim_fd(fd) < 0) {
505 // doesn't map to any simulator fd: not a valid target fd
506 return -EBADF;
507 }
508
509#if BSD_HOST
510 struct stat hostBuf;
511 int result = fstat(process->sim_fd(fd), &hostBuf);
512#else
513 struct stat64 hostBuf;
514 int result = fstat64(process->sim_fd(fd), &hostBuf);
515#endif
516
517 if (result < 0)
518 return -errno;
519
520 OS::copyOutStat64Buf(tc->getMemPort(), fd, tc->getSyscallArg(1), &hostBuf);
521
522 return 0;
523}
524
525
526/// Target lstat() handler.
527template <class OS>
528SyscallReturn
529lstatFunc(SyscallDesc *desc, int callnum, Process *process,
530 ThreadContext *tc)
531{
532 std::string path;
533
534 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
535 return -EFAULT;
536
537 struct stat hostBuf;
538 int result = lstat(path.c_str(), &hostBuf);
539
540 if (result < 0)
541 return -errno;
542
543 OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
544
545 return 0;
546}
547
548/// Target lstat64() handler.
549template <class OS>
550SyscallReturn
551lstat64Func(SyscallDesc *desc, int callnum, Process *process,
552 ThreadContext *tc)
553{
554 std::string path;
555
556 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
557 return -EFAULT;
558
559#if BSD_HOST
560 struct stat hostBuf;
561 int result = lstat(path.c_str(), &hostBuf);
562#else
563 struct stat64 hostBuf;
564 int result = lstat64(path.c_str(), &hostBuf);
565#endif
566
567 if (result < 0)
568 return -errno;
569
570 OS::copyOutStat64Buf(tc->getMemPort(), -1, tc->getSyscallArg(1), &hostBuf);
571
572 return 0;
573}
574
575/// Target fstat() handler.
576template <class OS>
577SyscallReturn
578fstatFunc(SyscallDesc *desc, int callnum, Process *process,
579 ThreadContext *tc)
580{
581 int fd = process->sim_fd(tc->getSyscallArg(0));
582
583 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
584
585 if (fd < 0)
586 return -EBADF;
587
588 struct stat hostBuf;
589 int result = fstat(fd, &hostBuf);
590
591 if (result < 0)
592 return -errno;
593
594 OS::copyOutStatBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
595
596 return 0;
597}
598
599
600/// Target statfs() handler.
601template <class OS>
602SyscallReturn
603statfsFunc(SyscallDesc *desc, int callnum, Process *process,
604 ThreadContext *tc)
605{
606 std::string path;
607
608 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
609 return -EFAULT;
610
611 struct statfs hostBuf;
612 int result = statfs(path.c_str(), &hostBuf);
613
614 if (result < 0)
615 return -errno;
616
617 OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
618
619 return 0;
620}
621
622
623/// Target fstatfs() handler.
624template <class OS>
625SyscallReturn
626fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
627 ThreadContext *tc)
628{
629 int fd = process->sim_fd(tc->getSyscallArg(0));
630
631 if (fd < 0)
632 return -EBADF;
633
634 struct statfs hostBuf;
635 int result = fstatfs(fd, &hostBuf);
636
637 if (result < 0)
638 return -errno;
639
640 OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
641
642 return 0;
643}
644
645
646/// Target writev() handler.
647template <class OS>
648SyscallReturn
649writevFunc(SyscallDesc *desc, int callnum, Process *process,
650 ThreadContext *tc)
651{
652 int fd = tc->getSyscallArg(0);
653 if (fd < 0 || process->sim_fd(fd) < 0) {
654 // doesn't map to any simulator fd: not a valid target fd
655 return -EBADF;
656 }
657
658 TranslatingPort *p = tc->getMemPort();
659 uint64_t tiov_base = tc->getSyscallArg(1);
660 size_t count = tc->getSyscallArg(2);
661 struct iovec hiov[count];
662 for (int i = 0; i < count; ++i)
663 {
664 typename OS::tgt_iovec tiov;
665
666 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
667 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
668 hiov[i].iov_len = gtoh(tiov.iov_len);
669 hiov[i].iov_base = new char [hiov[i].iov_len];
670 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
671 hiov[i].iov_len);
672 }
673
674 int result = writev(process->sim_fd(fd), hiov, count);
675
676 for (int i = 0; i < count; ++i)
677 {
678 delete [] (char *)hiov[i].iov_base;
679 }
680
681 if (result < 0)
682 return -errno;
683
684 return 0;
685}
686
687
688/// Target mmap() handler.
689///
690/// We don't really handle mmap(). If the target is mmaping an
691/// anonymous region or /dev/zero, we can get away with doing basically
692/// nothing (since memory is initialized to zero and the simulator
693/// doesn't really check addresses anyway). Always print a warning,
694/// since this could be seriously broken if we're not mapping
695/// /dev/zero.
696//
697/// Someday we should explicitly check for /dev/zero in open, flag the
698/// file descriptor, and fail (or implement!) a non-anonymous mmap to
699/// anything else.
700template <class OS>
701SyscallReturn
702mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
703{
704 Addr start = tc->getSyscallArg(0);
705 uint64_t length = tc->getSyscallArg(1);
706 // int prot = tc->getSyscallArg(2);
707 int flags = tc->getSyscallArg(3);
708 // int fd = p->sim_fd(tc->getSyscallArg(4));
709 // int offset = tc->getSyscallArg(5);
710
711 if ((start % TheISA::VMPageSize) != 0 ||
712 (length % TheISA::VMPageSize) != 0) {
713 warn("mmap failing: arguments not page-aligned: "
714 "start 0x%x length 0x%x",
715 start, length);
716 return -EINVAL;
717 }
718
719 if (start != 0) {
720 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
721 start, p->mmap_end);
722 }
723
724 // pick next address from our "mmap region"
725 start = p->mmap_end;
726 p->pTable->allocate(start, length);
727 p->mmap_end += length;
728
729 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
730 warn("allowing mmap of file @ fd %d. "
731 "This will break if not /dev/zero.", tc->getSyscallArg(4));
732 }
733
734 return start;
735}
736
737/// Target getrlimit() handler.
738template <class OS>
739SyscallReturn
740getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
741 ThreadContext *tc)
742{
743 unsigned resource = tc->getSyscallArg(0);
744 TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
745
746 switch (resource) {
747 case OS::TGT_RLIMIT_STACK:
748 // max stack size in bytes: make up a number (2MB for now)
749 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
750 rlp->rlim_cur = htog(rlp->rlim_cur);
751 rlp->rlim_max = htog(rlp->rlim_max);
752 break;
753
754 default:
755 std::cerr << "getrlimitFunc: unimplemented resource " << resource
756 << std::endl;
757 abort();
758 break;
759 }
760
761 rlp.copyOut(tc->getMemPort());
762 return 0;
763}
764
765/// Target gettimeofday() handler.
766template <class OS>
767SyscallReturn
768gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
769 ThreadContext *tc)
770{
771 TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
772
773 getElapsedTime(tp->tv_sec, tp->tv_usec);
774 tp->tv_sec += seconds_since_epoch;
775 tp->tv_sec = htog(tp->tv_sec);
776 tp->tv_usec = htog(tp->tv_usec);
777
778 tp.copyOut(tc->getMemPort());
779
780 return 0;
781}
782
783
784/// Target utimes() handler.
785template <class OS>
786SyscallReturn
787utimesFunc(SyscallDesc *desc, int callnum, Process *process,
788 ThreadContext *tc)
789{
790 std::string path;
791
792 if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
793 return -EFAULT;
794
795 TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
796 tp.copyIn(tc->getMemPort());
797
798 struct timeval hostTimeval[2];
799 for (int i = 0; i < 2; ++i)
800 {
801 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
802 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
803 }
804 int result = utimes(path.c_str(), hostTimeval);
805
806 if (result < 0)
807 return -errno;
808
809 return 0;
810}
811/// Target getrusage() function.
812template <class OS>
813SyscallReturn
814getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
815 ThreadContext *tc)
816{
817 int who = tc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
818 TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
819
820 if (who != OS::TGT_RUSAGE_SELF) {
821 // don't really handle THREAD or CHILDREN, but just warn and
822 // plow ahead
823 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
824 who);
825 }
826
827 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
828 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
829 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
830
831 rup->ru_stime.tv_sec = 0;
832 rup->ru_stime.tv_usec = 0;
833 rup->ru_maxrss = 0;
834 rup->ru_ixrss = 0;
835 rup->ru_idrss = 0;
836 rup->ru_isrss = 0;
837 rup->ru_minflt = 0;
838 rup->ru_majflt = 0;
839 rup->ru_nswap = 0;
840 rup->ru_inblock = 0;
841 rup->ru_oublock = 0;
842 rup->ru_msgsnd = 0;
843 rup->ru_msgrcv = 0;
844 rup->ru_nsignals = 0;
845 rup->ru_nvcsw = 0;
846 rup->ru_nivcsw = 0;
847
848 rup.copyOut(tc->getMemPort());
849
850 return 0;
851}
852
853
854
855
856#endif // __SIM_SYSCALL_EMUL_HH__
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