gem5/sim/syscall_emul.cc

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Restructuring of LiveProcess etc. to support multiple emulated OS syscall interfaces, and specific support for Alpha Linux. Split syscall emulation functions into several groups, based on whether they depend on the specific OS and/or architecture (and all combinations of above), including the use of template functions to support syscalls with slightly different constants or interface structs. arch/alpha/alpha_tru64_process.cc: Incorporate full Tru64 object definition here, including structure and constant definitions. This way we can wrap all of the functions inside the object, and not worry about namespace conflicts because no one outside this file will ever see it. base/loader/aout_object.cc: base/loader/aout_object.hh: base/loader/ecoff_object.cc: base/loader/ecoff_object.hh: base/loader/elf_object.cc: base/loader/elf_object.hh: base/loader/object_file.cc: base/loader/object_file.hh: Add enums to ObjectFile to indicate the object's architecture and operating system. cpu/exec_context.cc: prog.hh is now process.hh cpu/exec_context.hh: prog.hh is now process.hh move architecture-specific syscall arg accessors into ExecContext cpu/simple_cpu/simple_cpu.cc: No need to include prog.hh (which has been renamed) sim/process.cc: sim/process.hh: LiveProcess is now effectively an abstract base class. New LiveProcess::create() function takes an object file and dynamically picks the appropriate subclass of LiveProcess to handle the syscall interface that file expects (currently Tru64 or Linux). --HG-- rename : arch/alpha/fake_syscall.cc => arch/alpha/alpha_tru64_process.cc rename : sim/prog.cc => sim/process.cc rename : sim/prog.hh => sim/process.hh extra : convert_revision : 4a03ca7d94a34177cb672931f8aae83a6bad179a
2003-12-02 04:34:38 +01:00
/*
* Copyright (c) 2003 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.
*/
#include <unistd.h>
#include <string>
#include <iostream>
#include "sim/syscall_emul.hh"
#include "base/trace.hh"
#include "cpu/exec_context.hh"
#include "cpu/base_cpu.hh"
#include "sim/process.hh"
#include "sim/sim_events.hh"
using namespace std;
void
SyscallDesc::doSyscall(int callnum, Process *process, ExecContext *xc)
{
DPRINTFR(SyscallVerbose, "%s: syscall %s called\n",
xc->cpu->name(), name);
int retval = (*funcPtr)(this, callnum, process, xc);
DPRINTFR(SyscallVerbose, "%s: syscall %s returns %d\n",
xc->cpu->name(), name, retval);
if (!((flags & SyscallDesc::SuppressReturnValue) && retval == 0))
xc->setSyscallReturn(retval);
}
int
unimplementedFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
cerr << "Error: syscall " << desc->name
<< " (#" << callnum << ") unimplemented.";
cerr << " Args: " << xc->getSyscallArg(0) << ", " << xc->getSyscallArg(1)
<< ", ..." << endl;
abort();
}
int
ignoreFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
DCOUT(SyscallWarnings) << "Warning: ignoring syscall " << desc->name
<< "(" << xc->getSyscallArg(0)
<< ", " << xc->getSyscallArg(1)
<< ", ...)" << endl;
return 0;
}
int
exitFunc(SyscallDesc *desc, int callnum, Process *process,
ExecContext *xc)
{
new SimExitEvent("syscall caused exit", xc->getSyscallArg(0) & 0xff);
return 1;
}
int
getpagesizeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
return VMPageSize;
}
int
obreakFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
// change brk addr to first arg
Addr new_brk = xc->getSyscallArg(0);
if (new_brk != 0)
p->brk_point = xc->getSyscallArg(0);
Restructuring of LiveProcess etc. to support multiple emulated OS syscall interfaces, and specific support for Alpha Linux. Split syscall emulation functions into several groups, based on whether they depend on the specific OS and/or architecture (and all combinations of above), including the use of template functions to support syscalls with slightly different constants or interface structs. arch/alpha/alpha_tru64_process.cc: Incorporate full Tru64 object definition here, including structure and constant definitions. This way we can wrap all of the functions inside the object, and not worry about namespace conflicts because no one outside this file will ever see it. base/loader/aout_object.cc: base/loader/aout_object.hh: base/loader/ecoff_object.cc: base/loader/ecoff_object.hh: base/loader/elf_object.cc: base/loader/elf_object.hh: base/loader/object_file.cc: base/loader/object_file.hh: Add enums to ObjectFile to indicate the object's architecture and operating system. cpu/exec_context.cc: prog.hh is now process.hh cpu/exec_context.hh: prog.hh is now process.hh move architecture-specific syscall arg accessors into ExecContext cpu/simple_cpu/simple_cpu.cc: No need to include prog.hh (which has been renamed) sim/process.cc: sim/process.hh: LiveProcess is now effectively an abstract base class. New LiveProcess::create() function takes an object file and dynamically picks the appropriate subclass of LiveProcess to handle the syscall interface that file expects (currently Tru64 or Linux). --HG-- rename : arch/alpha/fake_syscall.cc => arch/alpha/alpha_tru64_process.cc rename : sim/prog.cc => sim/process.cc rename : sim/prog.hh => sim/process.hh extra : convert_revision : 4a03ca7d94a34177cb672931f8aae83a6bad179a
2003-12-02 04:34:38 +01:00
return p->brk_point;
}
int
closeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
return close(fd);
}
int
readFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
int nbytes = xc->getSyscallArg(2);
BufferArg bufArg(xc->getSyscallArg(1), nbytes);
int bytes_read = read(fd, bufArg.bufferPtr(), nbytes);
if (bytes_read != -1)
bufArg.copyOut(xc->mem);
return bytes_read;
}
int
writeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
int nbytes = xc->getSyscallArg(2);
BufferArg bufArg(xc->getSyscallArg(1), nbytes);
bufArg.copyIn(xc->mem);
int bytes_written = write(fd, bufArg.bufferPtr(), nbytes);
fsync(fd);
return bytes_written;
}
int
lseekFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int fd = p->sim_fd(xc->getSyscallArg(0));
uint64_t offs = xc->getSyscallArg(1);
int whence = xc->getSyscallArg(2);
off_t result = lseek(fd, offs, whence);
return (result == (off_t)-1) ? -errno : result;
}
int
munmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
// given that we don't really implement mmap, munmap is really easy
return 0;
}
const char *hostname = "m5.eecs.umich.edu";
int
gethostnameFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
int name_len = xc->getSyscallArg(1);
BufferArg name(xc->getSyscallArg(0), name_len);
strncpy((char *)name.bufferPtr(), hostname, name_len);
name.copyOut(xc->mem);
return 0;
}
int
unlinkFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
std::string path;
if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
int result = unlink(path.c_str());
return (result == -1) ? -errno : result;
}
int
renameFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
{
std::string old_name;
if (xc->mem->readString(old_name, xc->getSyscallArg(0)) != No_Fault)
return -EFAULT;
std::string new_name;
if (xc->mem->readString(new_name, xc->getSyscallArg(1)) != No_Fault)
return -EFAULT;
int result = rename(old_name.c_str(),new_name.c_str());
return (result == -1) ? -errno : result;
}
Restructuring of LiveProcess etc. to support multiple emulated OS syscall interfaces, and specific support for Alpha Linux. Split syscall emulation functions into several groups, based on whether they depend on the specific OS and/or architecture (and all combinations of above), including the use of template functions to support syscalls with slightly different constants or interface structs. arch/alpha/alpha_tru64_process.cc: Incorporate full Tru64 object definition here, including structure and constant definitions. This way we can wrap all of the functions inside the object, and not worry about namespace conflicts because no one outside this file will ever see it. base/loader/aout_object.cc: base/loader/aout_object.hh: base/loader/ecoff_object.cc: base/loader/ecoff_object.hh: base/loader/elf_object.cc: base/loader/elf_object.hh: base/loader/object_file.cc: base/loader/object_file.hh: Add enums to ObjectFile to indicate the object's architecture and operating system. cpu/exec_context.cc: prog.hh is now process.hh cpu/exec_context.hh: prog.hh is now process.hh move architecture-specific syscall arg accessors into ExecContext cpu/simple_cpu/simple_cpu.cc: No need to include prog.hh (which has been renamed) sim/process.cc: sim/process.hh: LiveProcess is now effectively an abstract base class. New LiveProcess::create() function takes an object file and dynamically picks the appropriate subclass of LiveProcess to handle the syscall interface that file expects (currently Tru64 or Linux). --HG-- rename : arch/alpha/fake_syscall.cc => arch/alpha/alpha_tru64_process.cc rename : sim/prog.cc => sim/process.cc rename : sim/prog.hh => sim/process.hh extra : convert_revision : 4a03ca7d94a34177cb672931f8aae83a6bad179a
2003-12-02 04:34:38 +01:00