which is evaluated slightly differently than in previous versions of gcc. arch/alpha/alpha_linux_process.cc: Alphabetize includes. arch/alpha/vptr.hh: Change the constants that are being used for alpha pagebytes to come from the ISA. base/random.hh: cpu/static_inst.cc: sim/param.cc: Fix up template syntax. base/range.hh: Include iostream for << operator. base/res_list.hh: base/statistics.hh: cpu/simple_cpu/simple_cpu.hh: cpu/static_inst.hh: sim/eventq.hh: sim/param.hh: Fixup for templated code to resolve different scope lookup in gcc 3.4. This defers the lookup of the function/variable until actual instantiation time by making it dependent on the templated class/function. base/trace.cc: Fix call to new. base/trace.hh: Fix up #define to have full path. cpu/base_cpu.cc: Fix up call to new. dev/etherlink.hh: dev/ns_gige.hh: dev/sinic.hh: Fixup for friend class/function declaration. g++ 3.4 no longer allows typedefs to be declared as a friend class. dev/pcidev.hh: Fix up re-definition of access level to params. kern/linux/linux_syscalls.hh: kern/tru64/tru64_syscalls.hh: Fix up header. Fix up template syntax. sim/serialize.cc: Include errno.h. sim/startup.cc: Change startupq. queue was getting destructed before all things had called ~StartupCallback(), which lead to a segfault. This puts startupq in global space, and we allocate it ourselves. Other code may be similar to this and may need changing in the future. sim/syscall_emul.hh: Include cpu/exec_context.hh and sim/process.hh, as forward declarations are no longer sufficient. sim/universe.cc: Include errno.h --HG-- extra : convert_revision : e49d08ee89eb06a28351f02bafc028ca6652d5af
507 lines
15 KiB
C++
507 lines
15 KiB
C++
/*
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* Copyright (c) 2003-2004 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __SIM_SYSCALL_EMUL_HH__
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#define __SIM_SYSCALL_EMUL_HH__
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///
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/// @file syscall_emul.hh
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///
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/// This file defines objects used to emulate syscalls from the target
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/// application on the host machine.
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#include <errno.h>
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#include <string>
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#include "base/intmath.hh" // for RoundUp
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#include "mem/functional_mem/functional_memory.hh"
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#include "targetarch/isa_traits.hh" // for Addr
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#include "base/trace.hh"
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#include "cpu/exec_context.hh"
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#include "sim/process.hh"
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///
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/// System call descriptor.
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///
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class SyscallDesc {
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public:
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/// Typedef for target syscall handler functions.
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typedef int (*FuncPtr)(SyscallDesc *, int num,
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Process *, ExecContext *);
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const char *name; //!< Syscall name (e.g., "open").
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FuncPtr funcPtr; //!< Pointer to emulation function.
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int flags; //!< Flags (see Flags enum).
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/// Flag values for controlling syscall behavior.
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enum Flags {
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/// Don't set return regs according to funcPtr return value.
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/// Used for syscalls with non-standard return conventions
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/// that explicitly set the ExecContext regs (e.g.,
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/// sigreturn).
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SuppressReturnValue = 1
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};
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/// Constructor.
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SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
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: name(_name), funcPtr(_funcPtr), flags(_flags)
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{
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}
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/// Emulate the syscall. Public interface for calling through funcPtr.
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void doSyscall(int callnum, Process *proc, ExecContext *xc);
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};
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class BaseBufferArg {
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public:
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BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
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{
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bufPtr = new uint8_t[size];
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// clear out buffer: in case we only partially populate this,
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// and then do a copyOut(), we want to make sure we don't
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// introduce any random junk into the simulated address space
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memset(bufPtr, 0, size);
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}
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virtual ~BaseBufferArg() { delete [] bufPtr; }
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//
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// copy data into simulator space (read from target memory)
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//
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virtual bool copyIn(FunctionalMemory *mem)
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{
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mem->access(Read, addr, bufPtr, size);
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return true; // no EFAULT detection for now
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}
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//
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// copy data out of simulator space (write to target memory)
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//
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virtual bool copyOut(FunctionalMemory *mem)
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{
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mem->access(Write, addr, bufPtr, size);
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return true; // no EFAULT detection for now
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}
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protected:
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Addr addr;
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int size;
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uint8_t *bufPtr;
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};
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class BufferArg : public BaseBufferArg
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{
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public:
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BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
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void *bufferPtr() { return bufPtr; }
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};
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template <class T>
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class TypedBufferArg : public BaseBufferArg
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{
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public:
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// user can optionally specify a specific number of bytes to
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// allocate to deal with those structs that have variable-size
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// arrays at the end
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TypedBufferArg(Addr _addr, int _size = sizeof(T))
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: BaseBufferArg(_addr, _size)
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{ }
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// type case
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operator T*() { return (T *)bufPtr; }
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// dereference operators
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T &operator*() { return *((T *)bufPtr); }
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T* operator->() { return (T *)bufPtr; }
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T &operator[](int i) { return ((T *)bufPtr)[i]; }
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};
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//////////////////////////////////////////////////////////////////////
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//
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// The following emulation functions are generic enough that they
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// don't need to be recompiled for different emulated OS's. They are
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// defined in sim/syscall_emul.cc.
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//
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//////////////////////////////////////////////////////////////////////
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/// Handler for unimplemented syscalls that we haven't thought about.
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int unimplementedFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Handler for unimplemented syscalls that we never intend to
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/// implement (signal handling, etc.) and should not affect the correct
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/// behavior of the program. Print a warning only if the appropriate
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/// trace flag is enabled. Return success to the target program.
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int ignoreFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target exit() handler: terminate simulation.
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int exitFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target getpagesize() handler.
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int getpagesizeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target obreak() handler: set brk address.
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int obreakFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target close() handler.
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int closeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target read() handler.
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int readFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target write() handler.
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int writeFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target lseek() handler.
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int lseekFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target munmap() handler.
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int munmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target gethostname() handler.
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int gethostnameFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target unlink() handler.
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int unlinkFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// Target rename() handler.
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int renameFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc);
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/// This struct is used to build an target-OS-dependent table that
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/// maps the target's open() flags to the host open() flags.
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struct OpenFlagTransTable {
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int tgtFlag; //!< Target system flag value.
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int hostFlag; //!< Corresponding host system flag value.
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};
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/// A readable name for 1,000,000, for converting microseconds to seconds.
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const int one_million = 1000000;
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/// Approximate seconds since the epoch (1/1/1970). About a billion,
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/// by my reckoning. We want to keep this a constant (not use the
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/// real-world time) to keep simulations repeatable.
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const unsigned seconds_since_epoch = 1000000000;
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/// Helper function to convert current elapsed time to seconds and
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/// microseconds.
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template <class T1, class T2>
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void
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getElapsedTime(T1 &sec, T2 &usec)
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{
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int cycles_per_usec = ticksPerSecond / one_million;
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int elapsed_usecs = curTick / cycles_per_usec;
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sec = elapsed_usecs / one_million;
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usec = elapsed_usecs % one_million;
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}
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//////////////////////////////////////////////////////////////////////
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//
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// The following emulation functions are generic, but need to be
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// templated to account for differences in types, constants, etc.
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//
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//////////////////////////////////////////////////////////////////////
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/// Target ioctl() handler. For the most part, programs call ioctl()
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/// only to find out if their stdout is a tty, to determine whether to
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/// do line or block buffering.
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template <class OS>
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int
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ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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int fd = xc->getSyscallArg(0);
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unsigned req = xc->getSyscallArg(1);
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// DPRINTFR(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
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if (fd < 0 || process->sim_fd(fd) < 0) {
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// doesn't map to any simulator fd: not a valid target fd
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return -EBADF;
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}
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switch (req) {
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case OS::TIOCISATTY:
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case OS::TIOCGETP:
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case OS::TIOCSETP:
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case OS::TIOCSETN:
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case OS::TIOCSETC:
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case OS::TIOCGETC:
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case OS::TIOCGETS:
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case OS::TIOCGETA:
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return -ENOTTY;
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default:
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fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n", fd, req, xc->readPC());
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}
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}
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/// Target open() handler.
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template <class OS>
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int
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openFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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std::string path;
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if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
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return -EFAULT;
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if (path == "/dev/sysdev0") {
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// This is a memory-mapped high-resolution timer device on Alpha.
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// We don't support it, so just punt.
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DCOUT(SyscallWarnings) << "Ignoring open(" << path << ", ...)" << std::endl;
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return -ENOENT;
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}
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int tgtFlags = xc->getSyscallArg(1);
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int mode = xc->getSyscallArg(2);
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int hostFlags = 0;
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// translate open flags
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for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
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if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
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tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
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hostFlags |= OS::openFlagTable[i].hostFlag;
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}
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}
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// any target flags left?
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if (tgtFlags != 0)
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std::cerr << "Syscall: open: cannot decode flags: " << tgtFlags << std::endl;
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#ifdef __CYGWIN32__
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hostFlags |= O_BINARY;
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#endif
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// open the file
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int fd = open(path.c_str(), hostFlags, mode);
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return (fd == -1) ? -errno : process->open_fd(fd);
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}
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/// Target stat() handler.
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template <class OS>
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int
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statFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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std::string path;
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if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
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return -EFAULT;
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struct stat hostBuf;
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int result = stat(path.c_str(), &hostBuf);
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if (result < 0)
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return -errno;
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OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
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return 0;
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}
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/// Target lstat() handler.
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template <class OS>
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int
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lstatFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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std::string path;
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if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
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return -EFAULT;
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struct stat hostBuf;
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int result = lstat(path.c_str(), &hostBuf);
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if (result < 0)
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return -errno;
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OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
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return 0;
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}
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/// Target fstat() handler.
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template <class OS>
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int
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fstatFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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int fd = process->sim_fd(xc->getSyscallArg(0));
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// DPRINTFR(SyscallVerbose, "fstat(%d, ...)\n", fd);
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if (fd < 0)
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return -EBADF;
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struct stat hostBuf;
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int result = fstat(fd, &hostBuf);
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if (result < 0)
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return -errno;
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OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
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return 0;
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}
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/// Target mmap() handler.
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///
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/// We don't really handle mmap(). If the target is mmaping an
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/// anonymous region or /dev/zero, we can get away with doing basically
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/// nothing (since memory is initialized to zero and the simulator
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/// doesn't really check addresses anyway). Always print a warning,
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/// since this could be seriously broken if we're not mapping
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/// /dev/zero.
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//
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/// Someday we should explicitly check for /dev/zero in open, flag the
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/// file descriptor, and fail (or implement!) a non-anonymous mmap to
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/// anything else.
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template <class OS>
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int
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mmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
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{
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Addr start = xc->getSyscallArg(0);
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uint64_t length = xc->getSyscallArg(1);
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// int prot = xc->getSyscallArg(2);
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int flags = xc->getSyscallArg(3);
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// int fd = p->sim_fd(xc->getSyscallArg(4));
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// int offset = xc->getSyscallArg(5);
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if (start == 0) {
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// user didn't give an address... pick one from our "mmap region"
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start = p->mmap_base;
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p->mmap_base += RoundUp<Addr>(length, VMPageSize);
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}
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if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
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DPRINTF(SyscallWarnings, "Warning: allowing mmap of file @ fd %d. "
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"This will break if not /dev/zero.", xc->getSyscallArg(4));
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}
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return start;
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}
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/// Target getrlimit() handler.
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template <class OS>
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int
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getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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unsigned resource = xc->getSyscallArg(0);
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TypedBufferArg<typename OS::rlimit> rlp(xc->getSyscallArg(1));
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switch (resource) {
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case OS::RLIMIT_STACK:
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// max stack size in bytes: make up a number (2MB for now)
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rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
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break;
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default:
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std::cerr << "getrlimitFunc: unimplemented resource " << resource << std::endl;
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abort();
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break;
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}
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rlp.copyOut(xc->mem);
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return 0;
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}
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/// Target gettimeofday() handler.
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template <class OS>
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int
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gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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TypedBufferArg<typename OS::timeval> tp(xc->getSyscallArg(0));
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getElapsedTime(tp->tv_sec, tp->tv_usec);
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tp->tv_sec += seconds_since_epoch;
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tp.copyOut(xc->mem);
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return 0;
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}
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/// Target getrusage() function.
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template <class OS>
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int
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getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
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ExecContext *xc)
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{
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int who = xc->getSyscallArg(0); // THREAD, SELF, or CHILDREN
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TypedBufferArg<typename OS::rusage> rup(xc->getSyscallArg(1));
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if (who != OS::RUSAGE_SELF) {
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// don't really handle THREAD or CHILDREN, but just warn and
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// plow ahead
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DCOUT(SyscallWarnings)
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<< "Warning: getrusage() only supports RUSAGE_SELF."
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<< " Parameter " << who << " ignored." << std::endl;
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}
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getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
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rup->ru_stime.tv_sec = 0;
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rup->ru_stime.tv_usec = 0;
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rup->ru_maxrss = 0;
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rup->ru_ixrss = 0;
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rup->ru_idrss = 0;
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rup->ru_isrss = 0;
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rup->ru_minflt = 0;
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rup->ru_majflt = 0;
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rup->ru_nswap = 0;
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rup->ru_inblock = 0;
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rup->ru_oublock = 0;
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rup->ru_msgsnd = 0;
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rup->ru_msgrcv = 0;
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rup->ru_nsignals = 0;
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rup->ru_nvcsw = 0;
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rup->ru_nivcsw = 0;
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rup.copyOut(xc->mem);
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return 0;
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}
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#endif // __SIM_SYSCALL_EMUL_HH__
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