Merge zizzer:/bk/m5 into isabel.reinhardt.house:/z/stever/bk/m5

--HG--
extra : convert_revision : d66ebc598fdcfc9477ea5a1e455b21d7b9e56936

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;
+}
+
+