#include "debug/SyscallVerbose.hh"
#include "kern/linux/linux.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
using namespace std;
#include "cpu/thread_context.hh"
#include "kern/freebsd/freebsd.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
#include "sim/system.hh"
#include "cpu/thread_context.hh"
#include "kern/linux/linux.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
#include "sim/system.hh"
#include "kern/linux/linux.hh"
#include "sim/eventq.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
#include "sim/system.hh"
#include "cpu/thread_context.hh"
#include "kern/linux/linux.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
#include "sim/system.hh"
#include "kern/linux/linux.hh"
#include "sim/eventq.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
#include "sim/system.hh"
#include "cpu/thread_context.hh"
#include "kern/linux/linux.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
using namespace std;
*/
#include "arch/sparc/linux/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
class LiveProcess;
#include "cpu/thread_context.hh"
#include "kern/solaris/solaris.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
using namespace std;
#include "cpu/thread_context.hh"
#include "kern/linux/linux.hh"
#include "sim/process.hh"
+#include "sim/syscall_desc.hh"
#include "sim/syscall_emul.hh"
using namespace std;
return -EFAULT;
if (!gdt.copyIn(tc->getMemProxy()))
- panic("Failed to copy in GDT for %s.\n", desc->name);
+ panic("Failed to copy in GDT for %s.\n", desc->name());
if (userDesc->entry_number == (uint32_t)(-1)) {
// Find a free TLS entry.
if (!userDesc.copyOut(tc->getMemProxy()))
return -EFAULT;
if (!gdt.copyOut(tc->getMemProxy()))
- panic("Failed to copy out GDT for %s.\n", desc->name);
+ panic("Failed to copy out GDT for %s.\n", desc->name());
return 0;
}
#include "mem/multi_level_page_table.hh"
#include "mem/page_table.hh"
#include "sim/process_impl.hh"
-#include "sim/syscall_emul.hh"
+#include "sim/syscall_desc.hh"
#include "sim/system.hh"
using namespace std;
Source('fd_entry.cc')
Source('pseudo_inst.cc')
Source('syscall_emul.cc')
+ Source('syscall_desc.cc')
DebugFlag('Checkpoint')
DebugFlag('Config')
#include "sim/debug.hh"
#include "sim/process_impl.hh"
#include "sim/stats.hh"
-#include "sim/syscall_emul.hh"
+#include "sim/syscall_desc.hh"
#include "sim/system.hh"
#if THE_ISA == ALPHA_ISA
#include "mem/se_translating_port_proxy.hh"
#include "sim/fd_entry.hh"
#include "sim/sim_object.hh"
-#include "sim/syscallreturn.hh"
+#include "sim/syscall_return.hh"
class PageTable;
struct ProcessParams;
--- /dev/null
+/*
+ * Copyright (c) 2012-2013, 2015 ARM Limited
+ * Copyright (c) 2015-2016 Advanced Micro Devices, Inc.
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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
+ * Kevin Lim
+ * Brandon Potter
+ */
+
+#ifndef __SIM_SYSCALL_DEBUG_MACROS_HH__
+#define __SIM_SYSCALL_DEBUG_MACROS_HH__
+
+#include "debug/SyscallBase.hh"
+#include "debug/SyscallVerbose.hh"
+
+/**
+ * This macro is intended to help with readability.
+ * FLAGEXT specifies to which flag to assign the message: SyscallBase,
+ * SyscallVerbose, etc..; notice that 'Syscall' is already prepended.
+ * FMT is the message to be appended to the header information. The header
+ * information contains the cpuid and thread id.
+ */
+#define DPRINTF_SYSCALL(FLAGEXT, FMT, ...) \
+ DPRINTFS(Syscall##FLAGEXT, tc->getCpuPtr(), "T%d : syscall " FMT, \
+ tc->threadId(), __VA_ARGS__)
+
+#endif // __SIM_SYSCALL_DEBUG_MACROS_HH__
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * Copyright (c) 2012-2013, 2015 ARM Limited
+ * Copyright (c) 2015-2016 Advanced Micro Devices, Inc.
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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
+ * Kevin Lim
+ * Brandon Potter
+ */
+
+#ifndef __SIM_SYSCALL_DESC_HH__
+#define __SIM_SYSCALL_DESC_HH__
+
+#include <string>
+
+class LiveProcess;
+class SyscallReturn;
+class ThreadContext;
+
+/**
+ * This class provides the wrapper interface for the system call
+ * implementations which are defined in the sim/syscall_emul files and
+ * bound to the ISAs in the architecture specific code
+ * (i.e. arch/X86/linux/process.cc).
+ */
+class SyscallDesc {
+ public:
+ /** Typedef the function pointer here to clean up code below */
+ typedef SyscallReturn (*SyscallExecutor)(SyscallDesc*, int num,
+ LiveProcess*, ThreadContext*);
+
+ SyscallDesc(const char *name, SyscallExecutor sys_exec, int flags = 0)
+ : _name(name), executor(sys_exec), _flags(flags), _warned(false)
+ {
+ }
+
+ /** Provide a mechanism to specify behavior for abnormal system calls */
+ enum Flags {
+ /**
+ * Do not set return registers according to executor return value.
+ * Used for system calls with non-standard return conventions that
+ * explicitly set the thread context regs (e.g., sigreturn, clone)
+ */
+ SuppressReturnValue = 1,
+ /** Warn only once for unimplemented system calls */
+ WarnOnce = 2
+ /* X2 = 4, // Remove these comments when the next field is added; */
+ /* X3 = 8, // point is to make it obvious that this defines vector */
+ };
+
+ /**
+ * Interface for invoking the system call funcion pointer. Note that
+ * this acts as a gateway for all system calls and serves a good point
+ * to add filters for behaviors or apply checks for all system calls.
+ * @param callnum Number associated with call (by operating system)
+ * @param proc Handle for the owning Process to pass information
+ * @param tc Handle for owning ThreadContext to pass information
+ */
+ void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
+
+ /**
+ * Return false if WarnOnce is set and a warning has already been issued.
+ * Otherwise, return true. Updates state as a side effect to help
+ * keep track of issued warnings.
+ */
+ bool needWarning();
+
+ bool warnOnce() const { return (_flags & WarnOnce); }
+
+ std::string name() { return _name; }
+
+ private:
+ /** System call name (e.g., open, mmap, clone, socket, etc.) */
+ std::string _name;
+
+ /** Mechanism for ISAs to connect to the emul function definitions */
+ SyscallExecutor executor;
+
+ /**
+ * Holds values set with the preceding enum; note that this has been
+ * used primarily for features that are mutually exclusive, but there's
+ * no reason that this needs to be true going forward.
+ */
+ int _flags;
+
+ /** Set if WarnOnce is specified in flags AFTER first call */
+ bool _warned;
+};
+
+#endif // __SIM_SYSCALL_DESC_HH__
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
-#include "debug/SyscallBase.hh"
-#include "debug/SyscallVerbose.hh"
#include "mem/page_table.hh"
#include "sim/process.hh"
#include "sim/sim_exit.hh"
+#include "sim/syscall_debug_macros.hh"
+#include "sim/syscall_desc.hh"
#include "sim/system.hh"
using namespace std;
using namespace TheISA;
-void
-SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc)
-{
- if (DTRACE(SyscallBase)) {
- int index = 0;
- IntReg arg[6] M5_VAR_USED;
-
- // we can't just put the calls to getSyscallArg() in the
- // DPRINTF arg list, because C++ doesn't guarantee their order
- for (int i = 0; i < 6; ++i)
- arg[i] = 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]);
- }
-
- SyscallReturn retval = (*funcPtr)(this, callnum, process, tc);
-
- 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);
-}
-
-
SyscallReturn
unimplementedFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
- fatal("syscall %s (#%d) unimplemented.", desc->name, callnum);
+ fatal("syscall %s (#%d) unimplemented.", desc->name(), callnum);
return 1;
}
ignoreFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
ThreadContext *tc)
{
- int index = 0;
- const char *extra_text = "";
-
- if (desc->warnOnce()) {
- if (desc->warned)
- return 0;
-
- desc->warned = true;
- extra_text = "\n (further warnings will be suppressed)";
+ if (desc->needWarning()) {
+ warn("ignoring syscall %s(...)%s", desc->name(), desc->warnOnce() ?
+ "\n (further warnings will be suppressed)" : "");
}
- warn("ignoring syscall %s(%d, ...)%s", desc->name,
- process->getSyscallArg(tc, index), extra_text);
-
return 0;
}
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
-#include "debug/SyscallBase.hh"
-#include "debug/SyscallVerbose.hh"
#include "mem/page_table.hh"
#include "sim/byteswap.hh"
#include "sim/emul_driver.hh"
#include "sim/process.hh"
+#include "sim/syscall_debug_macros.hh"
#include "sim/syscall_emul_buf.hh"
-#include "sim/syscallreturn.hh"
+#include "sim/syscall_return.hh"
#include "sim/system.hh"
-// This wrapper macro helps out with readability a bit. FLAGEXT specifies
-// the verbosity and FMT is the message to be appended to the syscall
-// header information. The syscall header information contains the cpuid
-// and thread id.
-#define DPRINTF_SYSCALL(FLAGEXT, FMT, ...) \
- DPRINTFS(Syscall##FLAGEXT, tc->getCpuPtr(), "T%d : syscall " FMT, \
- tc->threadId(), __VA_ARGS__)
-
-///
-/// System call descriptor.
-///
-class SyscallDesc {
-
- public:
-
- /// Typedef for target syscall handler functions.
- typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
- LiveProcess *, ThreadContext *);
-
- const char *name; //!< Syscall name (e.g., "open").
- FuncPtr funcPtr; //!< Pointer to emulation function.
- int flags; //!< Flags (see Flags enum).
- bool warned; //!< Have we warned about unimplemented syscall?
-
- /// Flag values for controlling syscall behavior.
- enum Flags {
- /// Don't set return regs according to funcPtr return value.
- /// Used for syscalls with non-standard return conventions
- /// that explicitly set the ThreadContext regs (e.g.,
- /// sigreturn).
- SuppressReturnValue = 1,
- WarnOnce = 2
- };
-
- /// Constructor.
- SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
- : name(_name), funcPtr(_funcPtr), flags(_flags), warned(false)
- {
- }
-
- /// Emulate the syscall. Public interface for calling through funcPtr.
- void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
-
- /// Is the WarnOnce flag set?
- bool warnOnce() const { return (flags & WarnOnce); }
-};
-
+class SyscallDesc;
//////////////////////////////////////////////////////////////////////
//
--- /dev/null
+/*
+ * 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: Gabe Black
+ */
+
+#ifndef __SIM_SYSCALLRETURN_HH__
+#define __SIM_SYSCALLRETURN_HH__
+
+#include "base/types.hh"
+
+/**
+ * This class represents the return value from an emulated system call,
+ * including any errno setting.
+ *
+ * On some platforms, the return value and errno are encoded in a
+ * single signed integer. A value less than zero but greater than
+ * -4096 indicates an error, and the value is the negation of the
+ * errno value. Otherwise, the call was successful and the integer is
+ * the return value. (Large negative numbers are considered
+ * successful to allow syscalls to return pointers to high memory,
+ * e.g., stack addresses.) See, for example, Appendix A of the AMD64
+ * ABI spec at http://www.x86-64.org/documentation/abi.pdf.
+ *
+ * Other platforms use a more complex interface, returning a value and
+ * an error code in separate registers.
+ *
+ * This class is designed to support both types of interfaces.
+ */
+class SyscallReturn
+{
+ public:
+
+ /// For simplicity, allow the object to be initialized with a
+ /// single signed integer using the same positive=success,
+ /// negative=-errno convention described above.
+ ///
+ /// Typically this constructor is used as a default type
+ /// conversion, so a bare integer is used where a SyscallReturn
+ /// value is expected, e.g., as the return value from a system
+ /// call emulation function ('return 0;' or 'return -EFAULT;').
+ SyscallReturn(int64_t v)
+ : value(v), retryFlag(false)
+ {}
+
+ /// Pseudo-constructor to create an instance with the retry flag set.
+ static SyscallReturn retry()
+ {
+ SyscallReturn s(0);
+ s.retryFlag = true;
+ return s;
+ }
+
+ ~SyscallReturn() {}
+
+ /// Was the system call successful?
+ bool successful() const
+ {
+ return (value >= 0 || value <= -4096);
+ }
+
+ /// Does the syscall need to be retried?
+ bool needsRetry() const { return retryFlag; }
+
+ /// The return value
+ int64_t returnValue() const
+ {
+ assert(successful());
+ return value;
+ }
+
+ /// The errno value
+ int errnoValue() const
+ {
+ assert(!successful());
+ return -value;
+ }
+
+ /// The encoded value (as described above)
+ int64_t encodedValue() const
+ {
+ return value;
+ }
+
+ private:
+
+ int64_t value;
+
+ bool retryFlag;
+};
+
+#endif
+++ /dev/null
-/*
- * 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: Gabe Black
- */
-
-#ifndef __SIM_SYSCALLRETURN_HH__
-#define __SIM_SYSCALLRETURN_HH__
-
-#include "base/types.hh"
-
-/**
- * This class represents the return value from an emulated system call,
- * including any errno setting.
- *
- * On some platforms, the return value and errno are encoded in a
- * single signed integer. A value less than zero but greater than
- * -4096 indicates an error, and the value is the negation of the
- * errno value. Otherwise, the call was successful and the integer is
- * the return value. (Large negative numbers are considered
- * successful to allow syscalls to return pointers to high memory,
- * e.g., stack addresses.) See, for example, Appendix A of the AMD64
- * ABI spec at http://www.x86-64.org/documentation/abi.pdf.
- *
- * Other platforms use a more complex interface, returning a value and
- * an error code in separate registers.
- *
- * This class is designed to support both types of interfaces.
- */
-class SyscallReturn
-{
- public:
-
- /// For simplicity, allow the object to be initialized with a
- /// single signed integer using the same positive=success,
- /// negative=-errno convention described above.
- ///
- /// Typically this constructor is used as a default type
- /// conversion, so a bare integer is used where a SyscallReturn
- /// value is expected, e.g., as the return value from a system
- /// call emulation function ('return 0;' or 'return -EFAULT;').
- SyscallReturn(int64_t v)
- : value(v), retryFlag(false)
- {}
-
- /// Pseudo-constructor to create an instance with the retry flag set.
- static SyscallReturn retry()
- {
- SyscallReturn s(0);
- s.retryFlag = true;
- return s;
- }
-
- ~SyscallReturn() {}
-
- /// Was the system call successful?
- bool successful() const
- {
- return (value >= 0 || value <= -4096);
- }
-
- /// Does the syscall need to be retried?
- bool needsRetry() const { return retryFlag; }
-
- /// The return value
- int64_t returnValue() const
- {
- assert(successful());
- return value;
- }
-
- /// The errno value
- int errnoValue() const
- {
- assert(!successful());
- return -value;
- }
-
- /// The encoded value (as described above)
- int64_t encodedValue() const
- {
- return value;
- }
-
- private:
-
- int64_t value;
-
- bool retryFlag;
-};
-
-#endif
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