2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
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.
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.
28 * Authors: Steve Reinhardt
32 #ifndef __SIM_SYSCALL_EMUL_HH__
33 #define __SIM_SYSCALL_EMUL_HH__
35 #define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
36 defined(__FreeBSD__) || defined(__CYGWIN__))
39 /// @file syscall_emul.hh
41 /// This file defines objects used to emulate syscalls from the target
42 /// application on the host machine.
47 #include <sys/fcntl.h> // for O_BINARY
53 #include "base/chunk_generator.hh"
54 #include "base/intmath.hh" // for RoundUp
55 #include "base/misc.hh"
56 #include "base/trace.hh"
57 #include "base/types.hh"
58 #include "config/the_isa.hh"
59 #include "cpu/base.hh"
60 #include "cpu/thread_context.hh"
61 #include "mem/translating_port.hh"
62 #include "mem/page_table.hh"
63 #include "sim/system.hh"
64 #include "sim/process.hh"
67 /// System call descriptor.
73 /// Typedef for target syscall handler functions.
74 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
75 LiveProcess *, ThreadContext *);
77 const char *name; //!< Syscall name (e.g., "open").
78 FuncPtr funcPtr; //!< Pointer to emulation function.
79 int flags; //!< Flags (see Flags enum).
81 /// Flag values for controlling syscall behavior.
83 /// Don't set return regs according to funcPtr return value.
84 /// Used for syscalls with non-standard return conventions
85 /// that explicitly set the ThreadContext regs (e.g.,
87 SuppressReturnValue = 1
91 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
92 : name(_name), funcPtr(_funcPtr), flags(_flags)
96 /// Emulate the syscall. Public interface for calling through funcPtr.
97 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
101 class BaseBufferArg {
105 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
107 bufPtr = new uint8_t[size];
108 // clear out buffer: in case we only partially populate this,
109 // and then do a copyOut(), we want to make sure we don't
110 // introduce any random junk into the simulated address space
111 memset(bufPtr, 0, size);
114 virtual ~BaseBufferArg() { delete [] bufPtr; }
117 // copy data into simulator space (read from target memory)
119 virtual bool copyIn(TranslatingPort *memport)
121 memport->readBlob(addr, bufPtr, size);
122 return true; // no EFAULT detection for now
126 // copy data out of simulator space (write to target memory)
128 virtual bool copyOut(TranslatingPort *memport)
130 memport->writeBlob(addr, bufPtr, size);
131 return true; // no EFAULT detection for now
141 class BufferArg : public BaseBufferArg
144 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
145 void *bufferPtr() { return bufPtr; }
149 class TypedBufferArg : public BaseBufferArg
152 // user can optionally specify a specific number of bytes to
153 // allocate to deal with those structs that have variable-size
155 TypedBufferArg(Addr _addr, int _size = sizeof(T))
156 : BaseBufferArg(_addr, _size)
160 operator T*() { return (T *)bufPtr; }
162 // dereference operators
163 T &operator*() { return *((T *)bufPtr); }
164 T* operator->() { return (T *)bufPtr; }
165 T &operator[](int i) { return ((T *)bufPtr)[i]; }
168 //////////////////////////////////////////////////////////////////////
170 // The following emulation functions are generic enough that they
171 // don't need to be recompiled for different emulated OS's. They are
172 // defined in sim/syscall_emul.cc.
174 //////////////////////////////////////////////////////////////////////
177 /// Handler for unimplemented syscalls that we haven't thought about.
178 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
179 LiveProcess *p, ThreadContext *tc);
181 /// Handler for unimplemented syscalls that we never intend to
182 /// implement (signal handling, etc.) and should not affect the correct
183 /// behavior of the program. Print a warning only if the appropriate
184 /// trace flag is enabled. Return success to the target program.
185 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
186 LiveProcess *p, ThreadContext *tc);
188 /// Target exit() handler: terminate current context.
189 SyscallReturn exitFunc(SyscallDesc *desc, int num,
190 LiveProcess *p, ThreadContext *tc);
192 /// Target exit_group() handler: terminate simulation. (exit all threads)
193 SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
194 LiveProcess *p, ThreadContext *tc);
196 /// Target getpagesize() handler.
197 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
198 LiveProcess *p, ThreadContext *tc);
200 /// Target brk() handler: set brk address.
201 SyscallReturn brkFunc(SyscallDesc *desc, int num,
202 LiveProcess *p, ThreadContext *tc);
204 /// Target close() handler.
205 SyscallReturn closeFunc(SyscallDesc *desc, int num,
206 LiveProcess *p, ThreadContext *tc);
208 /// Target read() handler.
209 SyscallReturn readFunc(SyscallDesc *desc, int num,
210 LiveProcess *p, ThreadContext *tc);
212 /// Target write() handler.
213 SyscallReturn writeFunc(SyscallDesc *desc, int num,
214 LiveProcess *p, ThreadContext *tc);
216 /// Target lseek() handler.
217 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
218 LiveProcess *p, ThreadContext *tc);
220 /// Target _llseek() handler.
221 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
222 LiveProcess *p, ThreadContext *tc);
224 /// Target munmap() handler.
225 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
226 LiveProcess *p, ThreadContext *tc);
228 /// Target gethostname() handler.
229 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
230 LiveProcess *p, ThreadContext *tc);
232 /// Target getcwd() handler.
233 SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
234 LiveProcess *p, ThreadContext *tc);
236 /// Target unlink() handler.
237 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
238 LiveProcess *p, ThreadContext *tc);
240 /// Target unlink() handler.
241 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
242 LiveProcess *p, ThreadContext *tc);
244 /// Target mkdir() handler.
245 SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
246 LiveProcess *p, ThreadContext *tc);
248 /// Target rename() handler.
249 SyscallReturn renameFunc(SyscallDesc *desc, int num,
250 LiveProcess *p, ThreadContext *tc);
253 /// Target truncate() handler.
254 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
255 LiveProcess *p, ThreadContext *tc);
258 /// Target ftruncate() handler.
259 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
260 LiveProcess *p, ThreadContext *tc);
263 /// Target truncate64() handler.
264 SyscallReturn truncate64Func(SyscallDesc *desc, int num,
265 LiveProcess *p, ThreadContext *tc);
267 /// Target ftruncate64() handler.
268 SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
269 LiveProcess *p, ThreadContext *tc);
272 /// Target umask() handler.
273 SyscallReturn umaskFunc(SyscallDesc *desc, int num,
274 LiveProcess *p, ThreadContext *tc);
277 /// Target chown() handler.
278 SyscallReturn chownFunc(SyscallDesc *desc, int num,
279 LiveProcess *p, ThreadContext *tc);
282 /// Target fchown() handler.
283 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
284 LiveProcess *p, ThreadContext *tc);
286 /// Target dup() handler.
287 SyscallReturn dupFunc(SyscallDesc *desc, int num,
288 LiveProcess *process, ThreadContext *tc);
290 /// Target fnctl() handler.
291 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
292 LiveProcess *process, ThreadContext *tc);
294 /// Target fcntl64() handler.
295 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
296 LiveProcess *process, ThreadContext *tc);
298 /// Target setuid() handler.
299 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
300 LiveProcess *p, ThreadContext *tc);
302 /// Target getpid() handler.
303 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
304 LiveProcess *p, ThreadContext *tc);
306 /// Target getuid() handler.
307 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
308 LiveProcess *p, ThreadContext *tc);
310 /// Target getgid() handler.
311 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
312 LiveProcess *p, ThreadContext *tc);
314 /// Target getppid() handler.
315 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
316 LiveProcess *p, ThreadContext *tc);
318 /// Target geteuid() handler.
319 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
320 LiveProcess *p, ThreadContext *tc);
322 /// Target getegid() handler.
323 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
324 LiveProcess *p, ThreadContext *tc);
326 /// Target clone() handler.
327 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
328 LiveProcess *p, ThreadContext *tc);
331 /// Pseudo Funcs - These functions use a different return convension,
332 /// returning a second value in a register other than the normal return register
333 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
334 LiveProcess *process, ThreadContext *tc);
336 /// Target getpidPseudo() handler.
337 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
338 LiveProcess *p, ThreadContext *tc);
340 /// Target getuidPseudo() handler.
341 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
342 LiveProcess *p, ThreadContext *tc);
344 /// Target getgidPseudo() handler.
345 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
346 LiveProcess *p, ThreadContext *tc);
349 /// A readable name for 1,000,000, for converting microseconds to seconds.
350 const int one_million = 1000000;
352 /// Approximate seconds since the epoch (1/1/1970). About a billion,
353 /// by my reckoning. We want to keep this a constant (not use the
354 /// real-world time) to keep simulations repeatable.
355 const unsigned seconds_since_epoch = 1000000000;
357 /// Helper function to convert current elapsed time to seconds and
359 template <class T1, class T2>
361 getElapsedTime(T1 &sec, T2 &usec)
363 int elapsed_usecs = curTick / SimClock::Int::us;
364 sec = elapsed_usecs / one_million;
365 usec = elapsed_usecs % one_million;
368 //////////////////////////////////////////////////////////////////////
370 // The following emulation functions are generic, but need to be
371 // templated to account for differences in types, constants, etc.
373 //////////////////////////////////////////////////////////////////////
376 typedef struct stat hst_stat;
377 typedef struct stat hst_stat64;
379 typedef struct stat hst_stat;
380 typedef struct stat64 hst_stat64;
383 //// Helper function to convert a host stat buffer to a target stat
384 //// buffer. Also copies the target buffer out to the simulated
385 //// memory space. Used by stat(), fstat(), and lstat().
387 template <typename target_stat, typename host_stat>
389 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
391 using namespace TheISA;
396 tgt->st_dev = host->st_dev;
397 tgt->st_dev = htog(tgt->st_dev);
398 tgt->st_ino = host->st_ino;
399 tgt->st_ino = htog(tgt->st_ino);
400 tgt->st_mode = host->st_mode;
402 // Claim to be a character device
403 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
404 tgt->st_mode |= S_IFCHR; // Set S_IFCHR
406 tgt->st_mode = htog(tgt->st_mode);
407 tgt->st_nlink = host->st_nlink;
408 tgt->st_nlink = htog(tgt->st_nlink);
409 tgt->st_uid = host->st_uid;
410 tgt->st_uid = htog(tgt->st_uid);
411 tgt->st_gid = host->st_gid;
412 tgt->st_gid = htog(tgt->st_gid);
414 tgt->st_rdev = 0x880d;
416 tgt->st_rdev = host->st_rdev;
417 tgt->st_rdev = htog(tgt->st_rdev);
418 tgt->st_size = host->st_size;
419 tgt->st_size = htog(tgt->st_size);
420 tgt->st_atimeX = host->st_atime;
421 tgt->st_atimeX = htog(tgt->st_atimeX);
422 tgt->st_mtimeX = host->st_mtime;
423 tgt->st_mtimeX = htog(tgt->st_mtimeX);
424 tgt->st_ctimeX = host->st_ctime;
425 tgt->st_ctimeX = htog(tgt->st_ctimeX);
426 // Force the block size to be 8k. This helps to ensure buffered io works
427 // consistently across different hosts.
428 tgt->st_blksize = 0x2000;
429 tgt->st_blksize = htog(tgt->st_blksize);
430 tgt->st_blocks = host->st_blocks;
431 tgt->st_blocks = htog(tgt->st_blocks);
436 template <typename target_stat, typename host_stat64>
438 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
440 using namespace TheISA;
442 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
443 #if defined(STAT_HAVE_NSEC)
444 tgt->st_atime_nsec = host->st_atime_nsec;
445 tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
446 tgt->st_mtime_nsec = host->st_mtime_nsec;
447 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
448 tgt->st_ctime_nsec = host->st_ctime_nsec;
449 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
451 tgt->st_atime_nsec = 0;
452 tgt->st_mtime_nsec = 0;
453 tgt->st_ctime_nsec = 0;
457 //Here are a couple convenience functions
460 copyOutStatBuf(TranslatingPort * mem, Addr addr,
461 hst_stat *host, bool fakeTTY = false)
463 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
464 tgt_stat_buf tgt(addr);
465 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
471 copyOutStat64Buf(TranslatingPort * mem, Addr addr,
472 hst_stat64 *host, bool fakeTTY = false)
474 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
475 tgt_stat_buf tgt(addr);
476 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
480 /// Target ioctl() handler. For the most part, programs call ioctl()
481 /// only to find out if their stdout is a tty, to determine whether to
482 /// do line or block buffering.
485 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
489 int fd = process->getSyscallArg(tc, index);
490 unsigned req = process->getSyscallArg(tc, index);
492 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
494 if (fd < 0 || process->sim_fd(fd) < 0) {
495 // doesn't map to any simulator fd: not a valid target fd
500 case OS::TIOCISATTY_:
512 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
513 fd, req, tc->readPC());
517 /// Target open() handler.
520 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
526 if (!tc->getMemPort()->tryReadString(path,
527 process->getSyscallArg(tc, index)))
530 if (path == "/dev/sysdev0") {
531 // This is a memory-mapped high-resolution timer device on Alpha.
532 // We don't support it, so just punt.
533 warn("Ignoring open(%s, ...)\n", path);
537 int tgtFlags = process->getSyscallArg(tc, index);
538 int mode = process->getSyscallArg(tc, index);
541 // translate open flags
542 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
543 if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
544 tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
545 hostFlags |= OS::openFlagTable[i].hostFlag;
549 // any target flags left?
551 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
554 hostFlags |= O_BINARY;
557 // Adjust path for current working directory
558 path = process->fullPath(path);
560 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
563 if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
564 !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
565 // It's a proc/sys entery and requires special handling
566 fd = OS::openSpecialFile(path, process, tc);
567 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
570 fd = open(path.c_str(), hostFlags, mode);
571 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
576 /// Target sysinfo() handler.
579 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
584 TypedBufferArg<typename OS::tgt_sysinfo>
585 sysinfo(process->getSyscallArg(tc, index));
587 sysinfo->uptime=seconds_since_epoch;
588 sysinfo->totalram=process->system->memSize();
590 sysinfo.copyOut(tc->getMemPort());
595 /// Target chmod() handler.
598 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
604 if (!tc->getMemPort()->tryReadString(path,
605 process->getSyscallArg(tc, index))) {
609 uint32_t mode = process->getSyscallArg(tc, index);
612 // XXX translate mode flags via OS::something???
615 // Adjust path for current working directory
616 path = process->fullPath(path);
619 int result = chmod(path.c_str(), hostMode);
627 /// Target fchmod() handler.
630 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
634 int fd = process->getSyscallArg(tc, index);
635 if (fd < 0 || process->sim_fd(fd) < 0) {
636 // doesn't map to any simulator fd: not a valid target fd
640 uint32_t mode = process->getSyscallArg(tc, index);
643 // XXX translate mode flags via OS::someting???
647 int result = fchmod(process->sim_fd(fd), hostMode);
654 /// Target mremap() handler.
657 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
660 Addr start = process->getSyscallArg(tc, index);
661 uint64_t old_length = process->getSyscallArg(tc, index);
662 uint64_t new_length = process->getSyscallArg(tc, index);
663 uint64_t flags = process->getSyscallArg(tc, index);
665 if ((start % TheISA::VMPageSize != 0) ||
666 (new_length % TheISA::VMPageSize != 0)) {
667 warn("mremap failing: arguments not page aligned");
671 if (new_length > old_length) {
672 if ((start + old_length) == process->mmap_end) {
673 uint64_t diff = new_length - old_length;
674 process->pTable->allocate(process->mmap_end, diff);
675 process->mmap_end += diff;
678 // sys/mman.h defined MREMAP_MAYMOVE
680 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
683 process->pTable->remap(start, old_length, process->mmap_end);
684 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
685 process->mmap_end, process->mmap_end + new_length, new_length);
686 start = process->mmap_end;
687 // add on the remaining unallocated pages
688 process->pTable->allocate(start + old_length, new_length - old_length);
689 process->mmap_end += new_length;
690 warn("returning %08p as start\n", start);
695 process->pTable->deallocate(start + new_length, old_length -
701 /// Target stat() handler.
704 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
710 if (!tc->getMemPort()->tryReadString(path,
711 process->getSyscallArg(tc, index))) {
714 Addr bufPtr = process->getSyscallArg(tc, index);
716 // Adjust path for current working directory
717 path = process->fullPath(path);
720 int result = stat(path.c_str(), &hostBuf);
725 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
731 /// Target stat64() handler.
734 stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
740 if (!tc->getMemPort()->tryReadString(path,
741 process->getSyscallArg(tc, index)))
743 Addr bufPtr = process->getSyscallArg(tc, index);
745 // Adjust path for current working directory
746 path = process->fullPath(path);
750 int result = stat(path.c_str(), &hostBuf);
752 struct stat64 hostBuf;
753 int result = stat64(path.c_str(), &hostBuf);
759 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
765 /// Target fstat64() handler.
768 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
772 int fd = process->getSyscallArg(tc, index);
773 Addr bufPtr = process->getSyscallArg(tc, index);
774 if (fd < 0 || process->sim_fd(fd) < 0) {
775 // doesn't map to any simulator fd: not a valid target fd
781 int result = fstat(process->sim_fd(fd), &hostBuf);
783 struct stat64 hostBuf;
784 int result = fstat64(process->sim_fd(fd), &hostBuf);
790 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
796 /// Target lstat() handler.
799 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
805 if (!tc->getMemPort()->tryReadString(path,
806 process->getSyscallArg(tc, index))) {
809 Addr bufPtr = process->getSyscallArg(tc, index);
811 // Adjust path for current working directory
812 path = process->fullPath(path);
815 int result = lstat(path.c_str(), &hostBuf);
820 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
825 /// Target lstat64() handler.
828 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
834 if (!tc->getMemPort()->tryReadString(path,
835 process->getSyscallArg(tc, index))) {
838 Addr bufPtr = process->getSyscallArg(tc, index);
840 // Adjust path for current working directory
841 path = process->fullPath(path);
845 int result = lstat(path.c_str(), &hostBuf);
847 struct stat64 hostBuf;
848 int result = lstat64(path.c_str(), &hostBuf);
854 copyOutStat64Buf<OS>(tc->getMemPort(), bufPtr, &hostBuf);
859 /// Target fstat() handler.
862 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
866 int fd = process->sim_fd(process->getSyscallArg(tc, index));
867 Addr bufPtr = process->getSyscallArg(tc, index);
869 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
875 int result = fstat(fd, &hostBuf);
880 copyOutStatBuf<OS>(tc->getMemPort(), bufPtr, &hostBuf, (fd == 1));
886 /// Target statfs() handler.
889 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
895 if (!tc->getMemPort()->tryReadString(path,
896 process->getSyscallArg(tc, index))) {
899 Addr bufPtr = process->getSyscallArg(tc, index);
901 // Adjust path for current working directory
902 path = process->fullPath(path);
904 struct statfs hostBuf;
905 int result = statfs(path.c_str(), &hostBuf);
910 OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
916 /// Target fstatfs() handler.
919 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
923 int fd = process->sim_fd(process->getSyscallArg(tc, index));
924 Addr bufPtr = process->getSyscallArg(tc, index);
929 struct statfs hostBuf;
930 int result = fstatfs(fd, &hostBuf);
935 OS::copyOutStatfsBuf(tc->getMemPort(), bufPtr, &hostBuf);
941 /// Target writev() handler.
944 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
948 int fd = process->getSyscallArg(tc, index);
949 if (fd < 0 || process->sim_fd(fd) < 0) {
950 // doesn't map to any simulator fd: not a valid target fd
954 TranslatingPort *p = tc->getMemPort();
955 uint64_t tiov_base = process->getSyscallArg(tc, index);
956 size_t count = process->getSyscallArg(tc, index);
957 struct iovec hiov[count];
958 for (size_t i = 0; i < count; ++i) {
959 typename OS::tgt_iovec tiov;
961 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
962 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
963 hiov[i].iov_len = gtoh(tiov.iov_len);
964 hiov[i].iov_base = new char [hiov[i].iov_len];
965 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
969 int result = writev(process->sim_fd(fd), hiov, count);
971 for (size_t i = 0; i < count; ++i)
972 delete [] (char *)hiov[i].iov_base;
981 /// Target mmap() handler.
983 /// We don't really handle mmap(). If the target is mmaping an
984 /// anonymous region or /dev/zero, we can get away with doing basically
985 /// nothing (since memory is initialized to zero and the simulator
986 /// doesn't really check addresses anyway). Always print a warning,
987 /// since this could be seriously broken if we're not mapping
990 /// Someday we should explicitly check for /dev/zero in open, flag the
991 /// file descriptor, and fail (or implement!) a non-anonymous mmap to
995 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
998 Addr start = p->getSyscallArg(tc, index);
999 uint64_t length = p->getSyscallArg(tc, index);
1000 index++; // int prot = p->getSyscallArg(tc, index);
1001 int flags = p->getSyscallArg(tc, index);
1002 int fd = p->sim_fd(p->getSyscallArg(tc, index));
1003 // int offset = p->getSyscallArg(tc, index);
1006 if ((start % TheISA::VMPageSize) != 0 ||
1007 (length % TheISA::VMPageSize) != 0) {
1008 warn("mmap failing: arguments not page-aligned: "
1009 "start 0x%x length 0x%x",
1015 warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
1016 start, p->mmap_end);
1019 // pick next address from our "mmap region"
1020 if (OS::mmapGrowsDown()) {
1021 start = p->mmap_end - length;
1022 p->mmap_end = start;
1024 start = p->mmap_end;
1025 p->mmap_end += length;
1027 p->pTable->allocate(start, length);
1029 if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1030 warn("allowing mmap of file @ fd %d. "
1031 "This will break if not /dev/zero.", fd);
1037 /// Target getrlimit() handler.
1040 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1044 unsigned resource = process->getSyscallArg(tc, index);
1045 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1048 case OS::TGT_RLIMIT_STACK:
1049 // max stack size in bytes: make up a number (8MB for now)
1050 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1051 rlp->rlim_cur = htog(rlp->rlim_cur);
1052 rlp->rlim_max = htog(rlp->rlim_max);
1055 case OS::TGT_RLIMIT_DATA:
1056 // max data segment size in bytes: make up a number
1057 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1058 rlp->rlim_cur = htog(rlp->rlim_cur);
1059 rlp->rlim_max = htog(rlp->rlim_max);
1063 std::cerr << "getrlimitFunc: unimplemented resource " << resource
1069 rlp.copyOut(tc->getMemPort());
1073 /// Target gettimeofday() handler.
1076 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1080 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1082 getElapsedTime(tp->tv_sec, tp->tv_usec);
1083 tp->tv_sec += seconds_since_epoch;
1084 tp->tv_sec = TheISA::htog(tp->tv_sec);
1085 tp->tv_usec = TheISA::htog(tp->tv_usec);
1087 tp.copyOut(tc->getMemPort());
1093 /// Target utimes() handler.
1096 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1102 if (!tc->getMemPort()->tryReadString(path,
1103 process->getSyscallArg(tc, index))) {
1107 TypedBufferArg<typename OS::timeval [2]>
1108 tp(process->getSyscallArg(tc, index));
1109 tp.copyIn(tc->getMemPort());
1111 struct timeval hostTimeval[2];
1112 for (int i = 0; i < 2; ++i)
1114 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
1115 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
1118 // Adjust path for current working directory
1119 path = process->fullPath(path);
1121 int result = utimes(path.c_str(), hostTimeval);
1128 /// Target getrusage() function.
1131 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1135 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1136 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1138 rup->ru_utime.tv_sec = 0;
1139 rup->ru_utime.tv_usec = 0;
1140 rup->ru_stime.tv_sec = 0;
1141 rup->ru_stime.tv_usec = 0;
1149 rup->ru_inblock = 0;
1150 rup->ru_oublock = 0;
1153 rup->ru_nsignals = 0;
1158 case OS::TGT_RUSAGE_SELF:
1159 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1160 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1161 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1164 case OS::TGT_RUSAGE_CHILDREN:
1165 // do nothing. We have no child processes, so they take no time.
1169 // don't really handle THREAD or CHILDREN, but just warn and
1171 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
1175 rup.copyOut(tc->getMemPort());
1180 /// Target times() function.
1183 timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1187 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1189 // Fill in the time structure (in clocks)
1190 int64_t clocks = curTick * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1191 bufp->tms_utime = clocks;
1192 bufp->tms_stime = 0;
1193 bufp->tms_cutime = 0;
1194 bufp->tms_cstime = 0;
1196 // Convert to host endianness
1197 bufp->tms_utime = htog(bufp->tms_utime);
1200 bufp.copyOut(tc->getMemPort());
1202 // Return clock ticks since system boot
1206 /// Target time() function.
1209 timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1212 typename OS::time_t sec, usec;
1213 getElapsedTime(sec, usec);
1214 sec += seconds_since_epoch;
1217 Addr taddr = (Addr)process->getSyscallArg(tc, index);
1219 typename OS::time_t t = sec;
1221 TranslatingPort *p = tc->getMemPort();
1222 p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1228 #endif // __SIM_SYSCALL_EMUL_HH__