gem5/sim/syscall_emul.hh
Nathan Binkert 13c005a8af shuffle files around for new directory structure
--HG--
rename : cpu/base_cpu.cc => cpu/base.cc
rename : cpu/base_cpu.hh => cpu/base.hh
rename : cpu/beta_cpu/2bit_local_pred.cc => cpu/o3/2bit_local_pred.cc
rename : cpu/beta_cpu/2bit_local_pred.hh => cpu/o3/2bit_local_pred.hh
rename : cpu/beta_cpu/alpha_full_cpu.cc => cpu/o3/alpha_cpu.cc
rename : cpu/beta_cpu/alpha_full_cpu.hh => cpu/o3/alpha_cpu.hh
rename : cpu/beta_cpu/alpha_full_cpu_builder.cc => cpu/o3/alpha_cpu_builder.cc
rename : cpu/beta_cpu/alpha_full_cpu_impl.hh => cpu/o3/alpha_cpu_impl.hh
rename : cpu/beta_cpu/alpha_dyn_inst.cc => cpu/o3/alpha_dyn_inst.cc
rename : cpu/beta_cpu/alpha_dyn_inst.hh => cpu/o3/alpha_dyn_inst.hh
rename : cpu/beta_cpu/alpha_dyn_inst_impl.hh => cpu/o3/alpha_dyn_inst_impl.hh
rename : cpu/beta_cpu/alpha_impl.hh => cpu/o3/alpha_impl.hh
rename : cpu/beta_cpu/alpha_params.hh => cpu/o3/alpha_params.hh
rename : cpu/beta_cpu/bpred_unit.cc => cpu/o3/bpred_unit.cc
rename : cpu/beta_cpu/bpred_unit.hh => cpu/o3/bpred_unit.hh
rename : cpu/beta_cpu/bpred_unit_impl.hh => cpu/o3/bpred_unit_impl.hh
rename : cpu/beta_cpu/btb.cc => cpu/o3/btb.cc
rename : cpu/beta_cpu/btb.hh => cpu/o3/btb.hh
rename : cpu/beta_cpu/comm.hh => cpu/o3/comm.hh
rename : cpu/beta_cpu/commit.cc => cpu/o3/commit.cc
rename : cpu/beta_cpu/commit.hh => cpu/o3/commit.hh
rename : cpu/beta_cpu/commit_impl.hh => cpu/o3/commit_impl.hh
rename : cpu/beta_cpu/full_cpu.cc => cpu/o3/cpu.cc
rename : cpu/beta_cpu/full_cpu.hh => cpu/o3/cpu.hh
rename : cpu/beta_cpu/cpu_policy.hh => cpu/o3/cpu_policy.hh
rename : cpu/beta_cpu/decode.cc => cpu/o3/decode.cc
rename : cpu/beta_cpu/decode.hh => cpu/o3/decode.hh
rename : cpu/beta_cpu/decode_impl.hh => cpu/o3/decode_impl.hh
rename : cpu/beta_cpu/fetch.cc => cpu/o3/fetch.cc
rename : cpu/beta_cpu/fetch.hh => cpu/o3/fetch.hh
rename : cpu/beta_cpu/fetch_impl.hh => cpu/o3/fetch_impl.hh
rename : cpu/beta_cpu/free_list.cc => cpu/o3/free_list.cc
rename : cpu/beta_cpu/free_list.hh => cpu/o3/free_list.hh
rename : cpu/beta_cpu/iew.cc => cpu/o3/iew.cc
rename : cpu/beta_cpu/iew.hh => cpu/o3/iew.hh
rename : cpu/beta_cpu/iew_impl.hh => cpu/o3/iew_impl.hh
rename : cpu/beta_cpu/inst_queue.cc => cpu/o3/inst_queue.cc
rename : cpu/beta_cpu/inst_queue.hh => cpu/o3/inst_queue.hh
rename : cpu/beta_cpu/inst_queue_impl.hh => cpu/o3/inst_queue_impl.hh
rename : cpu/beta_cpu/mem_dep_unit.cc => cpu/o3/mem_dep_unit.cc
rename : cpu/beta_cpu/mem_dep_unit.hh => cpu/o3/mem_dep_unit.hh
rename : cpu/beta_cpu/mem_dep_unit_impl.hh => cpu/o3/mem_dep_unit_impl.hh
rename : cpu/beta_cpu/ras.cc => cpu/o3/ras.cc
rename : cpu/beta_cpu/ras.hh => cpu/o3/ras.hh
rename : cpu/beta_cpu/regfile.hh => cpu/o3/regfile.hh
rename : cpu/beta_cpu/rename.cc => cpu/o3/rename.cc
rename : cpu/beta_cpu/rename.hh => cpu/o3/rename.hh
rename : cpu/beta_cpu/rename_impl.hh => cpu/o3/rename_impl.hh
rename : cpu/beta_cpu/rename_map.cc => cpu/o3/rename_map.cc
rename : cpu/beta_cpu/rename_map.hh => cpu/o3/rename_map.hh
rename : cpu/beta_cpu/rob.cc => cpu/o3/rob.cc
rename : cpu/beta_cpu/rob.hh => cpu/o3/rob.hh
rename : cpu/beta_cpu/rob_impl.hh => cpu/o3/rob_impl.hh
rename : cpu/beta_cpu/sat_counter.cc => cpu/o3/sat_counter.cc
rename : cpu/beta_cpu/sat_counter.hh => cpu/o3/sat_counter.hh
rename : cpu/beta_cpu/store_set.cc => cpu/o3/store_set.cc
rename : cpu/beta_cpu/store_set.hh => cpu/o3/store_set.hh
rename : cpu/beta_cpu/tournament_pred.cc => cpu/o3/tournament_pred.cc
rename : cpu/beta_cpu/tournament_pred.hh => cpu/o3/tournament_pred.hh
rename : cpu/ooo_cpu/ooo_cpu.cc => cpu/ozone/cpu.cc
rename : cpu/ooo_cpu/ooo_cpu.hh => cpu/ozone/cpu.hh
rename : cpu/ooo_cpu/ooo_impl.hh => cpu/ozone/cpu_impl.hh
rename : cpu/ooo_cpu/ea_list.cc => cpu/ozone/ea_list.cc
rename : cpu/ooo_cpu/ea_list.hh => cpu/ozone/ea_list.hh
rename : cpu/simple_cpu/simple_cpu.cc => cpu/simple/cpu.cc
rename : cpu/simple_cpu/simple_cpu.hh => cpu/simple/cpu.hh
rename : cpu/full_cpu/smt.hh => cpu/smt.hh
rename : cpu/full_cpu/op_class.hh => encumbered/cpu/full/op_class.hh
extra : convert_revision : c4a891d8d6d3e0e9e5ea56be47d851da44d8c032
2005-06-04 20:50:10 -04:00

583 lines
16 KiB
C++

/*
* 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.
*/
#ifndef __SIM_SYSCALL_EMUL_HH__
#define __SIM_SYSCALL_EMUL_HH__
///
/// @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>
#include "base/intmath.hh" // for RoundUp
#include "mem/functional/functional.hh"
#include "targetarch/isa_traits.hh" // for Addr
#include "base/trace.hh"
#include "cpu/exec_context.hh"
#include "sim/process.hh"
///
/// System call descriptor.
///
class SyscallDesc {
public:
/// Typedef for target syscall handler functions.
typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
Process *, ExecContext *);
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 ExecContext 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, Process *proc, ExecContext *xc);
};
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(FunctionalMemory *mem)
{
mem->access(Read, addr, bufPtr, size);
return true; // no EFAULT detection for now
}
//
// copy data out of simulator space (write to target memory)
//
virtual bool copyOut(FunctionalMemory *mem)
{
mem->access(Write, 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,
Process *p, ExecContext *xc);
/// 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,
Process *p, ExecContext *xc);
/// Target exit() handler: terminate simulation.
SyscallReturn exitFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target getpagesize() handler.
SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target obreak() handler: set brk address.
SyscallReturn obreakFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target close() handler.
SyscallReturn closeFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target read() handler.
SyscallReturn readFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target write() handler.
SyscallReturn writeFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target lseek() handler.
SyscallReturn lseekFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target munmap() handler.
SyscallReturn munmapFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target gethostname() handler.
SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target unlink() handler.
SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target rename() handler.
SyscallReturn renameFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target truncate() handler.
SyscallReturn truncateFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// Target ftruncate() handler.
SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
Process *p, ExecContext *xc);
/// This struct is used to build an target-OS-dependent table that
/// maps the target's open() flags to the host open() flags.
struct OpenFlagTransTable {
int tgtFlag; //!< Target system flag value.
int hostFlag; //!< Corresponding host system flag value.
};
/// 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.
//
//////////////////////////////////////////////////////////////////////
/// 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, Process *process,
ExecContext *xc)
{
int fd = xc->getSyscallArg(0);
unsigned req = xc->getSyscallArg(1);
// DPRINTFR(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, xc->readPC());
}
}
/// Target open() handler.
template <class OS>
SyscallReturn
openFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
std::string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
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 = xc->getSyscallArg(1);
int mode = xc->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
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->open_fd(fd);
}
/// Target stat() handler.
template <class OS>
SyscallReturn
statFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
std::string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
struct stat hostBuf;
int result = stat(path.c_str(), &hostBuf);
if (result < 0)
return errno;
OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target lstat() handler.
template <class OS>
SyscallReturn
lstatFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
std::string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
struct stat hostBuf;
int result = lstat(path.c_str(), &hostBuf);
if (result < 0)
return -errno;
OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target fstat() handler.
template <class OS>
SyscallReturn
fstatFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
int fd = process->sim_fd(xc->getSyscallArg(0));
// DPRINTFR(SyscallVerbose, "fstat(%d, ...)\n", fd);
if (fd < 0)
return -EBADF;
struct stat hostBuf;
int result = fstat(fd, &hostBuf);
if (result < 0)
return -errno;
OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target statfs() handler.
template <class OS>
SyscallReturn
statfsFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
std::string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
struct statfs hostBuf;
int result = statfs(path.c_str(), &hostBuf);
if (result < 0)
return errno;
OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
return 0;
}
/// Target fstatfs() handler.
template <class OS>
SyscallReturn
fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
int fd = process->sim_fd(xc->getSyscallArg(0));
if (fd < 0)
return -EBADF;
struct statfs hostBuf;
int result = fstatfs(fd, &hostBuf);
if (result < 0)
return errno;
OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
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, Process *p, ExecContext *xc)
{
Addr start = xc->getSyscallArg(0);
uint64_t length = xc->getSyscallArg(1);
// int prot = xc->getSyscallArg(2);
int flags = xc->getSyscallArg(3);
// int fd = p->sim_fd(xc->getSyscallArg(4));
// int offset = xc->getSyscallArg(5);
if (start == 0) {
// user didn't give an address... pick one from our "mmap region"
start = p->mmap_end;
p->mmap_end += RoundUp<Addr>(length, VMPageSize);
if (p->nxm_start != 0) {
//If we have an nxm space, make sure we haven't colided
assert(p->mmap_end < p->nxm_start);
}
}
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
DPRINTF(SyscallWarnings, "Warning: allowing mmap of file @ fd %d. "
"This will break if not /dev/zero.", xc->getSyscallArg(4));
}
return start;
}
/// Target getrlimit() handler.
template <class OS>
SyscallReturn
getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
unsigned resource = xc->getSyscallArg(0);
TypedBufferArg<typename OS::rlimit> rlp(xc->getSyscallArg(1));
switch (resource) {
case OS::RLIMIT_STACK:
// max stack size in bytes: make up a number (2MB for now)
rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
break;
default:
std::cerr << "getrlimitFunc: unimplemented resource " << resource
<< std::endl;
abort();
break;
}
rlp.copyOut(xc->mem);
return 0;
}
/// Target gettimeofday() handler.
template <class OS>
SyscallReturn
gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
TypedBufferArg<typename OS::timeval> tp(xc->getSyscallArg(0));
getElapsedTime(tp->tv_sec, tp->tv_usec);
tp->tv_sec += seconds_since_epoch;
tp.copyOut(xc->mem);
return 0;
}
/// Target getrusage() function.
template <class OS>
SyscallReturn
getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
int who = xc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
TypedBufferArg<typename OS::rusage> rup(xc->getSyscallArg(1));
if (who != OS::RUSAGE_SELF) {
// don't really handle THREAD or CHILDREN, but just warn and
// plow ahead
DCOUT(SyscallWarnings)
<< "Warning: getrusage() only supports RUSAGE_SELF."
<< " Parameter " << who << " ignored." << std::endl;
}
getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
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;
rup.copyOut(xc->mem);
return 0;
}
#endif // __SIM_SYSCALL_EMUL_HH__