diff options
author | Brandon Potter <brandon.potter@amd.com> | 2016-11-09 14:27:40 -0600 |
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committer | Brandon Potter <brandon.potter@amd.com> | 2016-11-09 14:27:40 -0600 |
commit | 1ced08c85055d5da845ca549c0f5fcea65ee3e08 (patch) | |
tree | d0e6b2bbd69b07281a35ac561697a1b145591042 /src/sim/syscall_desc.cc | |
parent | 7a8dda49a4ec33be17bbd101ebd68e02562b9c3d (diff) | |
download | gem5-1ced08c85055d5da845ca549c0f5fcea65ee3e08.tar.xz |
syscall_emul: [patch 2/22] move SyscallDesc into its own .hh and .cc
The class was crammed into syscall_emul.hh which has tons of forward
declarations and template definitions. To clean it up a bit, moved the
class into separate files and commented the class with doxygen style
comments. Also, provided some encapsulation by adding some accessors and
a mutator.
The syscallreturn.hh file was renamed syscall_return.hh to make it consistent
with other similarly named files in the src/sim directory.
The DPRINTF_SYSCALL macro was moved into its own header file with the
include the Base and Verbose flags as well.
--HG--
rename : src/sim/syscallreturn.hh => src/sim/syscall_return.hh
Diffstat (limited to 'src/sim/syscall_desc.cc')
-rw-r--r-- | src/sim/syscall_desc.cc | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/sim/syscall_desc.cc b/src/sim/syscall_desc.cc new file mode 100644 index 000000000..34fb43dae --- /dev/null +++ b/src/sim/syscall_desc.cc @@ -0,0 +1,88 @@ +/* + * Copyright (c) 2016 Advanced Micro Devices, Inc. + * 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 + * Ali Saidi + * Brandon Potter + */ + +#include "sim/syscall_desc.hh" + +#include "base/trace.hh" +#include "config/the_isa.hh" +#include "cpu/base.hh" +#include "cpu/thread_context.hh" +#include "sim/process.hh" +#include "sim/syscall_debug_macros.hh" +#include "sim/syscall_return.hh" + +void +SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc) +{ + TheISA::IntReg arg[6] M5_VAR_USED; + + /** + * Step through the first six parameters for the system call and + * retrieve their values. Note that index is incremented as a + * side-effect of the calling method. + */ + for (int index = 0; index < 6; ) + arg[index] = process->getSyscallArg(tc, index); + + /** + * Linux supports up to six system call arguments through registers + * so we want to print all six. Check to the relevant man page to + * verify how many are actually used by a given system call. + */ + DPRINTF_SYSCALL(Base, "%s called w/arguments %d, %d, %d, %d, %d, %d\n", + _name, arg[0], arg[1], arg[2], arg[3], arg[4], arg[5]); + + /** Invoke the system call */ + SyscallReturn retval = (*executor)(this, callnum, process, tc); + + /** + * If the system call needs to be restarted, most likely due to + * blocking behavior, warn that the system call will retry; + * alternatively, print the return value. + */ + if (retval.needsRetry()) + DPRINTF_SYSCALL(Base, "%s needs retry\n", _name); + else + DPRINTF_SYSCALL(Base, "%s returns %d\n", _name, retval.encodedValue()); + + if (!(_flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry()) + process->setSyscallReturn(tc, retval); +} + +bool +SyscallDesc::needWarning() +{ + bool suppress_warning = warnOnce() && _warned; + _warned = true; + return !suppress_warning; +} |