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gem5/src/sim/syscall_emul.hh
Rick Strong 376c7285ee Serialization: Fix serialization of file descriptors. Make sure open 
file descriptors are reopened and the file pointer is in the same
place as when the checkpoint occured.

Signed-off by: Ali Saidi

--HG--
extra : convert_revision : d9d2cd388c9c02f60e1269d6845891c35f94fc47
2007-11-29 00:22:46 -05:00

1023 lines
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/*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Steve Reinhardt
* Kevin Lim
*/
#ifndef __SIM_SYSCALL_EMUL_HH__
#define __SIM_SYSCALL_EMUL_HH__
#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
defined(__FreeBSD__) || defined(__CYGWIN__))
///
/// @file syscall_emul.hh
///
/// This file defines objects used to emulate syscalls from the target
/// application on the host machine.
#include <errno.h>
#include <string>
#ifdef __CYGWIN32__
#include <sys/fcntl.h> // for O_BINARY
#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/uio.h>
#include "sim/host.hh" // for Addr
#include "base/chunk_generator.hh"
#include "base/intmath.hh" // for RoundUp
#include "base/misc.hh"
#include "base/trace.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "mem/translating_port.hh"
#include "mem/page_table.hh"
#include "sim/process.hh"
///
/// System call descriptor.
///
class SyscallDesc {
public:
/// Typedef for target syscall handler functions.
typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
LiveProcess *, ThreadContext *);
const char *name; //!< Syscall name (e.g., "open").
FuncPtr funcPtr; //!< Pointer to emulation function.
int flags; //!< Flags (see Flags enum).
/// Flag values for controlling syscall behavior.
enum Flags {
/// Don't set return regs according to funcPtr return value.
/// Used for syscalls with non-standard return conventions
/// that explicitly set the ThreadContext regs (e.g.,
/// sigreturn).
SuppressReturnValue = 1
};
/// Constructor.
SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
: name(_name), funcPtr(_funcPtr), flags(_flags)
{
}
/// Emulate the syscall. Public interface for calling through funcPtr.
void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
};
class BaseBufferArg {
public:
BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
{
bufPtr = new uint8_t[size];
// clear out buffer: in case we only partially populate this,
// and then do a copyOut(), we want to make sure we don't
// introduce any random junk into the simulated address space
memset(bufPtr, 0, size);
}
virtual ~BaseBufferArg() { delete [] bufPtr; }
//
// copy data into simulator space (read from target memory)
//
virtual bool copyIn(TranslatingPort *memport)
{
memport->readBlob(addr, bufPtr, size);
return true; // no EFAULT detection for now
}
//
// copy data out of simulator space (write to target memory)
//
virtual bool copyOut(TranslatingPort *memport)
{
memport->writeBlob(addr, bufPtr, size);
return true; // no EFAULT detection for now
}
protected:
Addr addr;
int size;
uint8_t *bufPtr;
};
class BufferArg : public BaseBufferArg
{
public:
BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
void *bufferPtr() { return bufPtr; }
};
template <class T>
class TypedBufferArg : public BaseBufferArg
{
public:
// user can optionally specify a specific number of bytes to
// allocate to deal with those structs that have variable-size
// arrays at the end
TypedBufferArg(Addr _addr, int _size = sizeof(T))
: BaseBufferArg(_addr, _size)
{ }
// type case
operator T*() { return (T *)bufPtr; }
// dereference operators
T &operator*() { return *((T *)bufPtr); }
T* operator->() { return (T *)bufPtr; }
T &operator[](int i) { return ((T *)bufPtr)[i]; }
};
//////////////////////////////////////////////////////////////////////
//
// The following emulation functions are generic enough that they
// don't need to be recompiled for different emulated OS's. They are
// defined in sim/syscall_emul.cc.
//
//////////////////////////////////////////////////////////////////////
/// Handler for unimplemented syscalls that we haven't thought about.
SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Handler for unimplemented syscalls that we never intend to
/// implement (signal handling, etc.) and should not affect the correct
/// behavior of the program. Print a warning only if the appropriate
/// trace flag is enabled. Return success to the target program.
SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target exit() handler: terminate simulation.
SyscallReturn exitFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getpagesize() handler.
SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target obreak() handler: set brk address.
SyscallReturn obreakFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target close() handler.
SyscallReturn closeFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target read() handler.
SyscallReturn readFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target write() handler.
SyscallReturn writeFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target lseek() handler.
SyscallReturn lseekFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target _llseek() handler.
SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target munmap() handler.
SyscallReturn munmapFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target gethostname() handler.
SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target unlink() handler.
SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target rename() handler.
SyscallReturn renameFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target truncate() handler.
SyscallReturn truncateFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target ftruncate() handler.
SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target chown() handler.
SyscallReturn chownFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target fchown() handler.
SyscallReturn fchownFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target dup() handler.
SyscallReturn dupFunc(SyscallDesc *desc, int num,
LiveProcess *process, ThreadContext *tc);
/// Target fnctl() handler.
SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
LiveProcess *process, ThreadContext *tc);
/// Target fcntl64() handler.
SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
LiveProcess *process, ThreadContext *tc);
/// Target setuid() handler.
SyscallReturn setuidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getpid() handler.
SyscallReturn getpidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getuid() handler.
SyscallReturn getuidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getgid() handler.
SyscallReturn getgidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getppid() handler.
SyscallReturn getppidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target geteuid() handler.
SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getegid() handler.
SyscallReturn getegidFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Pseudo Funcs - These functions use a different return convension,
/// returning a second value in a register other than the normal return register
SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
LiveProcess *process, ThreadContext *tc);
/// Target getpidPseudo() handler.
SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getuidPseudo() handler.
SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getgidPseudo() handler.
SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// A readable name for 1,000,000, for converting microseconds to seconds.
const int one_million = 1000000;
/// Approximate seconds since the epoch (1/1/1970). About a billion,
/// by my reckoning. We want to keep this a constant (not use the
/// real-world time) to keep simulations repeatable.
const unsigned seconds_since_epoch = 1000000000;
/// Helper function to convert current elapsed time to seconds and
/// microseconds.
template <class T1, class T2>
void
getElapsedTime(T1 &sec, T2 &usec)
{
int elapsed_usecs = curTick / Clock::Int::us;
sec = elapsed_usecs / one_million;
usec = elapsed_usecs % one_million;
}
//////////////////////////////////////////////////////////////////////
//
// The following emulation functions are generic, but need to be
// templated to account for differences in types, constants, etc.
//
//////////////////////////////////////////////////////////////////////
#if NO_STAT64
typedef struct stat hst_stat;
typedef struct stat hst_stat64;
#else
typedef struct stat hst_stat;
typedef struct stat64 hst_stat64;
#endif
//// Helper function to convert a host stat buffer to a target stat
//// buffer. Also copies the target buffer out to the simulated
//// memory space. Used by stat(), fstat(), and lstat().
template <typename target_stat, typename host_stat>
static void
convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
{
using namespace TheISA;
if (fakeTTY)
tgt->st_dev = 0xA;
else
tgt->st_dev = host->st_dev;
tgt->st_dev = htog(tgt->st_dev);
tgt->st_ino = host->st_ino;
tgt->st_ino = htog(tgt->st_ino);
tgt->st_mode = host->st_mode;
tgt->st_mode = htog(tgt->st_mode);
tgt->st_nlink = host->st_nlink;
tgt->st_nlink = htog(tgt->st_nlink);
tgt->st_uid = host->st_uid;
tgt->st_uid = htog(tgt->st_uid);
tgt->st_gid = host->st_gid;
tgt->st_gid = htog(tgt->st_gid);
if (fakeTTY)
tgt->st_rdev = 0x880d;
else
tgt->st_rdev = host->st_rdev;
tgt->st_rdev = htog(tgt->st_rdev);
tgt->st_size = host->st_size;
tgt->st_size = htog(tgt->st_size);
tgt->st_atimeX = host->st_atime;
tgt->st_atimeX = htog(tgt->st_atimeX);
tgt->st_mtimeX = host->st_mtime;
tgt->st_mtimeX = htog(tgt->st_mtimeX);
tgt->st_ctimeX = host->st_ctime;
tgt->st_ctimeX = htog(tgt->st_ctimeX);
// Force the block size to be 8k. This helps to ensure buffered io works
// consistently across different hosts.
tgt->st_blksize = 0x2000;
tgt->st_blksize = htog(tgt->st_blksize);
tgt->st_blocks = host->st_blocks;
tgt->st_blocks = htog(tgt->st_blocks);
}
// Same for stat64
template <typename target_stat, typename host_stat64>
static void
convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
{
using namespace TheISA;
convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
#if defined(STAT_HAVE_NSEC)
tgt->st_atime_nsec = host->st_atime_nsec;
tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
tgt->st_mtime_nsec = host->st_mtime_nsec;
tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
tgt->st_ctime_nsec = host->st_ctime_nsec;
tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
#else
tgt->st_atime_nsec = 0;
tgt->st_mtime_nsec = 0;
tgt->st_ctime_nsec = 0;
#endif
}
//Here are a couple convenience functions
template<class OS>
static void
copyOutStatBuf(TranslatingPort * mem, Addr addr,
hst_stat *host, bool fakeTTY = false)
{
typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
tgt_stat_buf tgt(addr);
convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
tgt.copyOut(mem);
}
template<class OS>
static void
copyOutStat64Buf(TranslatingPort * mem, Addr addr,
hst_stat64 *host, bool fakeTTY = false)
{
typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
tgt_stat_buf tgt(addr);
convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
tgt.copyOut(mem);
}
/// Target ioctl() handler. For the most part, programs call ioctl()
/// only to find out if their stdout is a tty, to determine whether to
/// do line or block buffering.
template <class OS>
SyscallReturn
ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int fd = tc->getSyscallArg(0);
unsigned req = tc->getSyscallArg(1);
DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
if (fd < 0 || process->sim_fd(fd) < 0) {
// doesn't map to any simulator fd: not a valid target fd
return -EBADF;
}
switch (req) {
case OS::TIOCISATTY_:
case OS::TIOCGETP_:
case OS::TIOCSETP_:
case OS::TIOCSETN_:
case OS::TIOCSETC_:
case OS::TIOCGETC_:
case OS::TIOCGETS_:
case OS::TIOCGETA_:
return -ENOTTY;
default:
fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
fd, req, tc->readPC());
}
}
/// Target open() handler.
template <class OS>
SyscallReturn
openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
if (path == "/dev/sysdev0") {
// This is a memory-mapped high-resolution timer device on Alpha.
// We don't support it, so just punt.
warn("Ignoring open(%s, ...)\n", path);
return -ENOENT;
}
int tgtFlags = tc->getSyscallArg(1);
int mode = tc->getSyscallArg(2);
int hostFlags = 0;
// translate open flags
for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
hostFlags |= OS::openFlagTable[i].hostFlag;
}
}
// any target flags left?
if (tgtFlags != 0)
warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
#ifdef __CYGWIN32__
hostFlags |= O_BINARY;
#endif
// Adjust path for current working directory
path = process->fullPath(path);
DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
// open the file
int fd = open(path.c_str(), hostFlags, mode);
return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
}
/// Target chmod() handler.
template <class OS>
SyscallReturn
chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
uint32_t mode = tc->getSyscallArg(1);
mode_t hostMode = 0;
// XXX translate mode flags via OS::something???
hostMode = mode;
// Adjust path for current working directory
path = process->fullPath(path);
// do the chmod
int result = chmod(path.c_str(), hostMode);
if (result < 0)
return -errno;
return 0;
}
/// Target fchmod() handler.
template <class OS>
SyscallReturn
fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int fd = tc->getSyscallArg(0);
if (fd < 0 || process->sim_fd(fd) < 0) {
// doesn't map to any simulator fd: not a valid target fd
return -EBADF;
}
uint32_t mode = tc->getSyscallArg(1);
mode_t hostMode = 0;
// XXX translate mode flags via OS::someting???
hostMode = mode;
// do the fchmod
int result = fchmod(process->sim_fd(fd), hostMode);
if (result < 0)
return -errno;
return 0;
}
/// Target stat() handler.
template <class OS>
SyscallReturn
statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
// Adjust path for current working directory
path = process->fullPath(path);
struct stat hostBuf;
int result = stat(path.c_str(), &hostBuf);
if (result < 0)
return -errno;
copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target stat64() handler.
template <class OS>
SyscallReturn
stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
// Adjust path for current working directory
path = process->fullPath(path);
#if NO_STAT64
struct stat hostBuf;
int result = stat(path.c_str(), &hostBuf);
#else
struct stat64 hostBuf;
int result = stat64(path.c_str(), &hostBuf);
#endif
if (result < 0)
return -errno;
copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target fstat64() handler.
template <class OS>
SyscallReturn
fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int fd = tc->getSyscallArg(0);
if (fd < 0 || process->sim_fd(fd) < 0) {
// doesn't map to any simulator fd: not a valid target fd
return -EBADF;
}
#if NO_STAT64
struct stat hostBuf;
int result = fstat(process->sim_fd(fd), &hostBuf);
#else
struct stat64 hostBuf;
int result = fstat64(process->sim_fd(fd), &hostBuf);
#endif
if (result < 0)
return -errno;
copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
&hostBuf, (fd == 1));
return 0;
}
/// Target lstat() handler.
template <class OS>
SyscallReturn
lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
// Adjust path for current working directory
path = process->fullPath(path);
struct stat hostBuf;
int result = lstat(path.c_str(), &hostBuf);
if (result < 0)
return -errno;
copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target lstat64() handler.
template <class OS>
SyscallReturn
lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
// Adjust path for current working directory
path = process->fullPath(path);
#if NO_STAT64
struct stat hostBuf;
int result = lstat(path.c_str(), &hostBuf);
#else
struct stat64 hostBuf;
int result = lstat64(path.c_str(), &hostBuf);
#endif
if (result < 0)
return -errno;
copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target fstat() handler.
template <class OS>
SyscallReturn
fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int fd = process->sim_fd(tc->getSyscallArg(0));
DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
if (fd < 0)
return -EBADF;
struct stat hostBuf;
int result = fstat(fd, &hostBuf);
if (result < 0)
return -errno;
copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
&hostBuf, (fd == 1));
return 0;
}
/// Target statfs() handler.
template <class OS>
SyscallReturn
statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
// Adjust path for current working directory
path = process->fullPath(path);
struct statfs hostBuf;
int result = statfs(path.c_str(), &hostBuf);
if (result < 0)
return -errno;
OS::copyOutStatfsBuf(tc->getMemPort(),
(Addr)(tc->getSyscallArg(1)), &hostBuf);
return 0;
}
/// Target fstatfs() handler.
template <class OS>
SyscallReturn
fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int fd = process->sim_fd(tc->getSyscallArg(0));
if (fd < 0)
return -EBADF;
struct statfs hostBuf;
int result = fstatfs(fd, &hostBuf);
if (result < 0)
return -errno;
OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
&hostBuf);
return 0;
}
/// Target writev() handler.
template <class OS>
SyscallReturn
writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int fd = tc->getSyscallArg(0);
if (fd < 0 || process->sim_fd(fd) < 0) {
// doesn't map to any simulator fd: not a valid target fd
return -EBADF;
}
TranslatingPort *p = tc->getMemPort();
uint64_t tiov_base = tc->getSyscallArg(1);
size_t count = tc->getSyscallArg(2);
struct iovec hiov[count];
for (int i = 0; i < count; ++i)
{
typename OS::tgt_iovec tiov;
p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
(uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
hiov[i].iov_len = gtoh(tiov.iov_len);
hiov[i].iov_base = new char [hiov[i].iov_len];
p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
hiov[i].iov_len);
}
int result = writev(process->sim_fd(fd), hiov, count);
for (int i = 0; i < count; ++i)
{
delete [] (char *)hiov[i].iov_base;
}
if (result < 0)
return -errno;
return 0;
}
/// Target mmap() handler.
///
/// We don't really handle mmap(). If the target is mmaping an
/// anonymous region or /dev/zero, we can get away with doing basically
/// nothing (since memory is initialized to zero and the simulator
/// doesn't really check addresses anyway). Always print a warning,
/// since this could be seriously broken if we're not mapping
/// /dev/zero.
//
/// Someday we should explicitly check for /dev/zero in open, flag the
/// file descriptor, and fail (or implement!) a non-anonymous mmap to
/// anything else.
template <class OS>
SyscallReturn
mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
{
Addr start = tc->getSyscallArg(0);
uint64_t length = tc->getSyscallArg(1);
// int prot = tc->getSyscallArg(2);
int flags = tc->getSyscallArg(3);
// int fd = p->sim_fd(tc->getSyscallArg(4));
// int offset = tc->getSyscallArg(5);
if ((start % TheISA::VMPageSize) != 0 ||
(length % TheISA::VMPageSize) != 0) {
warn("mmap failing: arguments not page-aligned: "
"start 0x%x length 0x%x",
start, length);
return -EINVAL;
}
if (start != 0) {
warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
start, p->mmap_end);
}
// pick next address from our "mmap region"
start = p->mmap_end;
p->pTable->allocate(start, length);
p->mmap_end += length;
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
warn("allowing mmap of file @ fd %d. "
"This will break if not /dev/zero.", tc->getSyscallArg(4));
}
return start;
}
/// Target getrlimit() handler.
template <class OS>
SyscallReturn
getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
unsigned resource = tc->getSyscallArg(0);
TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
switch (resource) {
case OS::TGT_RLIMIT_STACK:
// max stack size in bytes: make up a number (2MB for now)
rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
rlp->rlim_cur = htog(rlp->rlim_cur);
rlp->rlim_max = htog(rlp->rlim_max);
break;
default:
std::cerr << "getrlimitFunc: unimplemented resource " << resource
<< std::endl;
abort();
break;
}
rlp.copyOut(tc->getMemPort());
return 0;
}
/// Target gettimeofday() handler.
template <class OS>
SyscallReturn
gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
getElapsedTime(tp->tv_sec, tp->tv_usec);
tp->tv_sec += seconds_since_epoch;
tp->tv_sec = htog(tp->tv_sec);
tp->tv_usec = htog(tp->tv_usec);
tp.copyOut(tc->getMemPort());
return 0;
}
/// Target utimes() handler.
template <class OS>
SyscallReturn
utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
return -EFAULT;
TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
tp.copyIn(tc->getMemPort());
struct timeval hostTimeval[2];
for (int i = 0; i < 2; ++i)
{
hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
}
// Adjust path for current working directory
path = process->fullPath(path);
int result = utimes(path.c_str(), hostTimeval);
if (result < 0)
return -errno;
return 0;
}
/// Target getrusage() function.
template <class OS>
SyscallReturn
getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int who = tc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
rup->ru_utime.tv_sec = 0;
rup->ru_utime.tv_usec = 0;
rup->ru_stime.tv_sec = 0;
rup->ru_stime.tv_usec = 0;
rup->ru_maxrss = 0;
rup->ru_ixrss = 0;
rup->ru_idrss = 0;
rup->ru_isrss = 0;
rup->ru_minflt = 0;
rup->ru_majflt = 0;
rup->ru_nswap = 0;
rup->ru_inblock = 0;
rup->ru_oublock = 0;
rup->ru_msgsnd = 0;
rup->ru_msgrcv = 0;
rup->ru_nsignals = 0;
rup->ru_nvcsw = 0;
rup->ru_nivcsw = 0;
switch (who) {
case OS::TGT_RUSAGE_SELF:
getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
break;
case OS::TGT_RUSAGE_CHILDREN:
// do nothing. We have no child processes, so they take no time.
break;
default:
// don't really handle THREAD or CHILDREN, but just warn and
// plow ahead
warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.",
who);
}
rup.copyOut(tc->getMemPort());
return 0;
}
#endif // __SIM_SYSCALL_EMUL_HH__
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