diff options
Diffstat (limited to 'sim/syscall_emul.cc')
| -rw-r--r-- | sim/syscall_emul.cc | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/sim/syscall_emul.cc b/sim/syscall_emul.cc new file mode 100644 index 000000000..0e4e78612 --- /dev/null +++ b/sim/syscall_emul.cc @@ -0,0 +1,197 @@ +/* + * 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); +} + + +// +// Handler for unimplemented syscalls that we haven't thought about. +// +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(); +} + + +// +// 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. +// +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 + p->brk_point = xc->getSyscallArg(0); + 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; +} + + |