bb0e80f5fdc311de91ac558d5268c919d2a820c3
2 * Copyright (c) 2016 Advanced Micro Devices, Inc.
3 * Copyright (c) 2003-2005 The Regents of The University of Michigan
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15 * this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29 * Authors: Steve Reinhardt
34 #include "sim/syscall_desc.hh"
36 #include "base/trace.hh"
37 #include "config/the_isa.hh"
38 #include "cpu/base.hh"
39 #include "cpu/thread_context.hh"
40 #include "sim/process.hh"
41 #include "sim/syscall_debug_macros.hh"
42 #include "sim/syscall_return.hh"
45 SyscallDesc::doSyscall(int callnum
, Process
*process
, ThreadContext
*tc
)
47 TheISA::IntReg arg
[6] M5_VAR_USED
;
50 * Step through the first six parameters for the system call and
51 * retrieve their values. Note that index is incremented as a
52 * side-effect of the getSyscallArg method which is why the LHS
55 for (int index
= 0; index
< 6; )
56 arg
[index
- 1] = process
->getSyscallArg(tc
, index
);
59 * Linux supports up to six system call arguments through registers
60 * so we want to print all six. Check to the relevant man page to
61 * verify how many are actually used by a given system call.
63 DPRINTF_SYSCALL(Base
, "%s called w/arguments %d, %d, %d, %d, %d, %d\n",
64 _name
, arg
[0], arg
[1], arg
[2], arg
[3], arg
[4], arg
[5]);
66 /** Invoke the system call */
67 SyscallReturn retval
= (*executor
)(this, callnum
, process
, tc
);
70 * If the system call needs to be restarted, most likely due to
71 * blocking behavior, warn that the system call will retry;
72 * alternatively, print the return value.
74 if (retval
.needsRetry())
75 DPRINTF_SYSCALL(Base
, "%s needs retry\n", _name
);
77 DPRINTF_SYSCALL(Base
, "%s returns %d\n", _name
, retval
.encodedValue());
79 if (!(_flags
& SyscallDesc::SuppressReturnValue
) && !retval
.needsRetry())
80 process
->setSyscallReturn(tc
, retval
);
84 SyscallDesc::needWarning()
86 bool suppress_warning
= warnOnce() && _warned
;
88 return !suppress_warning
;