sanchayanmaity/gem5
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity
gem5/src/sim/syscall_emul.hh
Koan-Sin Tan 7d4f187700 clang: Enable compiling gem5 using clang 2.9 and 3.0 
This patch adds the necessary flags to the SConstruct and SConscript
files for compiling using clang 2.9 and later (on Ubuntu et al and OSX
XCode 4.2), and also cleans up a bunch of compiler warnings found by
clang. Most of the warnings are related to hidden virtual functions,
comparisons with unsigneds >= 0, and if-statements with empty
bodies. A number of mismatches between struct and class are also
fixed. clang 2.8 is not working as it has problems with class names
that occur in multiple namespaces (e.g. Statistics in
kernel_stats.hh).

clang has a bug (http://llvm.org/bugs/show_bug.cgi?id=7247) which
causes confusion between the container std::set and the function
Packet::set, and this is currently addressed by not including the
entire namespace std, but rather selecting e.g. "using std::vector" in
the appropriate places.
2012-01-31 12:05:52 -05:00

1265 lines
37 KiB
C++
Raw Blame History

/*
* 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.
#ifdef __CYGWIN32__
#include <sys/fcntl.h> // for O_BINARY
#endif
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <fcntl.h>
#include <cerrno>
#include <string>
#include "base/chunk_generator.hh"
#include "base/intmath.hh" // for RoundUp
#include "base/misc.hh"
#include "base/trace.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "debug/SyscallVerbose.hh"
#include "mem/page_table.hh"
#include "mem/se_translating_port_proxy.hh"
#include "sim/byteswap.hh"
#include "sim/process.hh"
#include "sim/system.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(SETranslatingPortProxy* memproxy)
{
memproxy->readBlob(addr, bufPtr, size);
return true; // no EFAULT detection for now
}
//
// copy data out of simulator space (write to target memory)
//
virtual bool copyOut(SETranslatingPortProxy* memproxy)
{
memproxy->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);
SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target exit() handler: terminate current context.
SyscallReturn exitFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target exit_group() handler: terminate simulation. (exit all threads)
SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target getpagesize() handler.
SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target brk() handler: set brk address.
SyscallReturn brkFunc(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 getcwd() handler.
SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target unlink() handler.
SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target unlink() handler.
SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target mkdir() handler.
SyscallReturn mkdirFunc(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 truncate64() handler.
SyscallReturn truncate64Func(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target ftruncate64() handler.
SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
LiveProcess *p, ThreadContext *tc);
/// Target umask() handler.
SyscallReturn umaskFunc(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);
/// Target clone() handler.
SyscallReturn cloneFunc(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() / SimClock::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 = TheISA::htog(tgt->st_dev);
tgt->st_ino = host->st_ino;
tgt->st_ino = TheISA::htog(tgt->st_ino);
tgt->st_mode = host->st_mode;
if (fakeTTY) {
// Claim to be a character device
tgt->st_mode &= ~S_IFMT; // Clear S_IFMT
tgt->st_mode |= S_IFCHR; // Set S_IFCHR
}
tgt->st_mode = TheISA::htog(tgt->st_mode);
tgt->st_nlink = host->st_nlink;
tgt->st_nlink = TheISA::htog(tgt->st_nlink);
tgt->st_uid = host->st_uid;
tgt->st_uid = TheISA::htog(tgt->st_uid);
tgt->st_gid = host->st_gid;
tgt->st_gid = TheISA::htog(tgt->st_gid);
if (fakeTTY)
tgt->st_rdev = 0x880d;
else
tgt->st_rdev = host->st_rdev;
tgt->st_rdev = TheISA::htog(tgt->st_rdev);
tgt->st_size = host->st_size;
tgt->st_size = TheISA::htog(tgt->st_size);
tgt->st_atimeX = host->st_atime;
tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
tgt->st_mtimeX = host->st_mtime;
tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
tgt->st_ctimeX = host->st_ctime;
tgt->st_ctimeX = TheISA::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 = TheISA::htog(tgt->st_blksize);
tgt->st_blocks = host->st_blocks;
tgt->st_blocks = TheISA::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 = TheISA::htog(tgt->st_atime_nsec);
tgt->st_mtime_nsec = host->st_mtime_nsec;
tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
tgt->st_ctime_nsec = host->st_ctime_nsec;
tgt->st_ctime_nsec = TheISA::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(SETranslatingPortProxy* 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(SETranslatingPortProxy* mem, Addr addr,
hst_stat64 *host, bool fakeTTY = false)
{
typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
tgt_stat_buf tgt(addr);
convertStat64Buf<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 index = 0;
int fd = process->getSyscallArg(tc, index);
unsigned req = process->getSyscallArg(tc, index);
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_:
case OS::TCSETAW_:
return -ENOTTY;
default:
fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
fd, req, tc->pcState());
}
}
/// Target open() handler.
template <class OS>
SyscallReturn
openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index)))
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 = process->getSyscallArg(tc, index);
int mode = process->getSyscallArg(tc, index);
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());
int fd;
if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
!path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
// It's a proc/sys entery and requires special handling
fd = OS::openSpecialFile(path, process, tc);
return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
} else {
// open the file
fd = open(path.c_str(), hostFlags, mode);
return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
}
}
/// Target sysinfo() handler.
template <class OS>
SyscallReturn
sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
TypedBufferArg<typename OS::tgt_sysinfo>
sysinfo(process->getSyscallArg(tc, index));
sysinfo->uptime=seconds_since_epoch;
sysinfo->totalram=process->system->memSize();
sysinfo.copyOut(tc->getMemProxy());
return 0;
}
/// Target chmod() handler.
template <class OS>
SyscallReturn
chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
uint32_t mode = process->getSyscallArg(tc, index);
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 index = 0;
int fd = process->getSyscallArg(tc, index);
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 = process->getSyscallArg(tc, index);
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 mremap() handler.
template <class OS>
SyscallReturn
mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
{
int index = 0;
Addr start = process->getSyscallArg(tc, index);
uint64_t old_length = process->getSyscallArg(tc, index);
uint64_t new_length = process->getSyscallArg(tc, index);
uint64_t flags = process->getSyscallArg(tc, index);
if ((start % TheISA::VMPageSize != 0) ||
(new_length % TheISA::VMPageSize != 0)) {
warn("mremap failing: arguments not page aligned");
return -EINVAL;
}
if (new_length > old_length) {
if ((start + old_length) == process->mmap_end) {
uint64_t diff = new_length - old_length;
process->allocateMem(process->mmap_end, diff);
process->mmap_end += diff;
return start;
} else {
// sys/mman.h defined MREMAP_MAYMOVE
if (!(flags & 1)) {
warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
return -ENOMEM;
} else {
process->pTable->remap(start, old_length, process->mmap_end);
warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
process->mmap_end, process->mmap_end + new_length, new_length);
start = process->mmap_end;
// add on the remaining unallocated pages
process->allocateMem(start + old_length,
new_length - old_length);
process->mmap_end += new_length;
warn("returning %08p as start\n", start);
return start;
}
}
} else {
process->pTable->unmap(start + new_length, old_length - new_length);
return start;
}
}
/// Target stat() handler.
template <class OS>
SyscallReturn
statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
Addr bufPtr = process->getSyscallArg(tc, index);
// 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->getMemProxy(), bufPtr, &hostBuf);
return 0;
}
/// Target stat64() handler.
template <class OS>
SyscallReturn
stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index)))
return -EFAULT;
Addr bufPtr = process->getSyscallArg(tc, index);
// 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->getMemProxy(), bufPtr, &hostBuf);
return 0;
}
/// Target fstat64() handler.
template <class OS>
SyscallReturn
fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
int fd = process->getSyscallArg(tc, index);
Addr bufPtr = process->getSyscallArg(tc, index);
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->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
return 0;
}
/// Target lstat() handler.
template <class OS>
SyscallReturn
lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
Addr bufPtr = process->getSyscallArg(tc, index);
// 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->getMemProxy(), bufPtr, &hostBuf);
return 0;
}
/// Target lstat64() handler.
template <class OS>
SyscallReturn
lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
Addr bufPtr = process->getSyscallArg(tc, index);
// 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->getMemProxy(), bufPtr, &hostBuf);
return 0;
}
/// Target fstat() handler.
template <class OS>
SyscallReturn
fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
int fd = process->sim_fd(process->getSyscallArg(tc, index));
Addr bufPtr = process->getSyscallArg(tc, index);
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->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
return 0;
}
/// Target statfs() handler.
template <class OS>
SyscallReturn
statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
Addr bufPtr = process->getSyscallArg(tc, index);
// 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->getMemProxy(), bufPtr, &hostBuf);
return 0;
}
/// Target fstatfs() handler.
template <class OS>
SyscallReturn
fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
int fd = process->sim_fd(process->getSyscallArg(tc, index));
Addr bufPtr = process->getSyscallArg(tc, index);
if (fd < 0)
return -EBADF;
struct statfs hostBuf;
int result = fstatfs(fd, &hostBuf);
if (result < 0)
return -errno;
OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
return 0;
}
/// Target writev() handler.
template <class OS>
SyscallReturn
writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
int fd = process->getSyscallArg(tc, index);
if (fd < 0 || process->sim_fd(fd) < 0) {
// doesn't map to any simulator fd: not a valid target fd
return -EBADF;
}
SETranslatingPortProxy *p = tc->getMemProxy();
uint64_t tiov_base = process->getSyscallArg(tc, index);
size_t count = process->getSyscallArg(tc, index);
struct iovec hiov[count];
for (size_t 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 = TheISA::gtoh(tiov.iov_len);
hiov[i].iov_base = new char [hiov[i].iov_len];
p->readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
hiov[i].iov_len);
}
int result = writev(process->sim_fd(fd), hiov, count);
for (size_t 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).
///
template <class OS>
SyscallReturn
mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
{
int index = 0;
Addr start = p->getSyscallArg(tc, index);
uint64_t length = p->getSyscallArg(tc, index);
index++; // int prot = p->getSyscallArg(tc, index);
int flags = p->getSyscallArg(tc, index);
int tgt_fd = p->getSyscallArg(tc, index);
// int offset = p->getSyscallArg(tc, index);
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
if (!fd_map || fd_map->fd < 0) {
warn("mmap failing: target fd %d is not valid\n", tgt_fd);
return -EBADF;
}
if (fd_map->filename != "/dev/zero") {
// This is very likely broken, but leave a warning here
// (rather than panic) in case /dev/zero is known by
// another name on some platform
warn("allowing mmap of file %s; mmap not supported on files"
" other than /dev/zero\n", fd_map->filename);
}
}
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;
}
// are we ok with clobbering existing mappings? only set this to
// true if the user has been warned.
bool clobber = false;
// try to use the caller-provided address if there is one
bool use_provided_address = (start != 0);
if (use_provided_address) {
// check to see if the desired address is already in use
if (!p->pTable->isUnmapped(start, length)) {
// there are existing mappings in the desired range
// whether we clobber them or not depends on whether the caller
// specified MAP_FIXED
if (flags & OS::TGT_MAP_FIXED) {
// MAP_FIXED specified: clobber existing mappings
warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
start);
clobber = true;
} else {
// MAP_FIXED not specified: ignore suggested start address
warn("mmap: ignoring suggested map address 0x%x\n", start);
use_provided_address = false;
}
}
}
if (!use_provided_address) {
// no address provided, or provided address unusable:
// pick next address from our "mmap region"
if (OS::mmapGrowsDown()) {
start = p->mmap_end - length;
p->mmap_end = start;
} else {
start = p->mmap_end;
p->mmap_end += length;
}
}
p->allocateMem(start, length, clobber);
return start;
}
/// Target getrlimit() handler.
template <class OS>
SyscallReturn
getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
unsigned resource = process->getSyscallArg(tc, index);
TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
switch (resource) {
case OS::TGT_RLIMIT_STACK:
// max stack size in bytes: make up a number (8MB for now)
rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
rlp->rlim_max = TheISA::htog(rlp->rlim_max);
break;
case OS::TGT_RLIMIT_DATA:
// max data segment size in bytes: make up a number
rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
rlp->rlim_max = TheISA::htog(rlp->rlim_max);
break;
default:
std::cerr << "getrlimitFunc: unimplemented resource " << resource
<< std::endl;
abort();
break;
}
rlp.copyOut(tc->getMemProxy());
return 0;
}
/// Target gettimeofday() handler.
template <class OS>
SyscallReturn
gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
getElapsedTime(tp->tv_sec, tp->tv_usec);
tp->tv_sec += seconds_since_epoch;
tp->tv_sec = TheISA::htog(tp->tv_sec);
tp->tv_usec = TheISA::htog(tp->tv_usec);
tp.copyOut(tc->getMemProxy());
return 0;
}
/// Target utimes() handler.
template <class OS>
SyscallReturn
utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
std::string path;
int index = 0;
if (!tc->getMemProxy()->tryReadString(path,
process->getSyscallArg(tc, index))) {
return -EFAULT;
}
TypedBufferArg<typename OS::timeval [2]>
tp(process->getSyscallArg(tc, index));
tp.copyIn(tc->getMemProxy());
struct timeval hostTimeval[2];
for (int i = 0; i < 2; ++i)
{
hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
hostTimeval[i].tv_usec = TheISA::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 index = 0;
int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
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 = TheISA::htog(rup->ru_utime.tv_sec);
rup->ru_utime.tv_usec = TheISA::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->getMemProxy());
return 0;
}
/// Target times() function.
template <class OS>
SyscallReturn
timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
int index = 0;
TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
// Fill in the time structure (in clocks)
int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
bufp->tms_utime = clocks;
bufp->tms_stime = 0;
bufp->tms_cutime = 0;
bufp->tms_cstime = 0;
// Convert to host endianness
bufp->tms_utime = TheISA::htog(bufp->tms_utime);
// Write back
bufp.copyOut(tc->getMemProxy());
// Return clock ticks since system boot
return clocks;
}
/// Target time() function.
template <class OS>
SyscallReturn
timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
typename OS::time_t sec, usec;
getElapsedTime(sec, usec);
sec += seconds_since_epoch;
int index = 0;
Addr taddr = (Addr)process->getSyscallArg(tc, index);
if(taddr != 0) {
typename OS::time_t t = sec;
t = TheISA::htog(t);
SETranslatingPortProxy *p = tc->getMemProxy();
p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
}
return sec;
}
#endif // __SIM_SYSCALL_EMUL_HH__
Reference in a new issue View git blame Copy permalink