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Diffstat (limited to 'src/sim/syscall_emul.hh')
-rw-r--r-- | src/sim/syscall_emul.hh | 943 |
1 files changed, 943 insertions, 0 deletions
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh new file mode 100644 index 000000000..edd4e331d --- /dev/null +++ b/src/sim/syscall_emul.hh @@ -0,0 +1,943 @@ +/* + * 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 + */ + +#ifndef __SIM_SYSCALL_EMUL_HH__ +#define __SIM_SYSCALL_EMUL_HH__ + +#define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \ + defined(__FreeBSD__) || defined(__CYGWIN__)) + +/// +/// @file syscall_emul.hh +/// +/// This file defines objects used to emulate syscalls from the target +/// application on the host machine. + +#include <errno.h> +#include <string> +#ifdef __CYGWIN32__ +#include <sys/fcntl.h> // for O_BINARY +#endif +#include <sys/stat.h> +#include <fcntl.h> +#include <sys/uio.h> + +#include "sim/host.hh" // for Addr +#include "base/chunk_generator.hh" +#include "base/intmath.hh" // for RoundUp +#include "base/misc.hh" +#include "base/trace.hh" +#include "cpu/base.hh" +#include "cpu/thread_context.hh" +#include "mem/translating_port.hh" +#include "mem/page_table.hh" +#include "sim/process.hh" + +/// +/// 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). + + /// 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 + }; + + /// Constructor. + SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0) + : name(_name), funcPtr(_funcPtr), flags(_flags) + { + } + + /// Emulate the syscall. Public interface for calling through funcPtr. + void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc); +}; + + +class BaseBufferArg { + + public: + + BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size) + { + bufPtr = new uint8_t[size]; + // clear out buffer: in case we only partially populate this, + // and then do a copyOut(), we want to make sure we don't + // introduce any random junk into the simulated address space + memset(bufPtr, 0, size); + } + + virtual ~BaseBufferArg() { delete [] bufPtr; } + + // + // copy data into simulator space (read from target memory) + // + virtual bool copyIn(TranslatingPort *memport) + { + memport->readBlob(addr, bufPtr, size); + return true; // no EFAULT detection for now + } + + // + // copy data out of simulator space (write to target memory) + // + virtual bool copyOut(TranslatingPort *memport) + { + memport->writeBlob(addr, bufPtr, size); + return true; // no EFAULT detection for now + } + + protected: + Addr addr; + int size; + uint8_t *bufPtr; +}; + + +class BufferArg : public BaseBufferArg +{ + public: + BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { } + void *bufferPtr() { return bufPtr; } +}; + +template <class T> +class TypedBufferArg : public BaseBufferArg +{ + public: + // user can optionally specify a specific number of bytes to + // allocate to deal with those structs that have variable-size + // arrays at the end + TypedBufferArg(Addr _addr, int _size = sizeof(T)) + : BaseBufferArg(_addr, _size) + { } + + // type case + operator T*() { return (T *)bufPtr; } + + // dereference operators + T &operator*() { return *((T *)bufPtr); } + T* operator->() { return (T *)bufPtr; } + T &operator[](int i) { return ((T *)bufPtr)[i]; } +}; + +////////////////////////////////////////////////////////////////////// +// +// The following emulation functions are generic enough that they +// don't need to be recompiled for different emulated OS's. They are +// defined in sim/syscall_emul.cc. +// +////////////////////////////////////////////////////////////////////// + + +/// Handler for unimplemented syscalls that we haven't thought about. +SyscallReturn unimplementedFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// 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. +SyscallReturn ignoreFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target exit() handler: terminate simulation. +SyscallReturn exitFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getpagesize() handler. +SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target obreak() handler: set brk address. +SyscallReturn obreakFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target close() handler. +SyscallReturn closeFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target read() handler. +SyscallReturn readFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target write() handler. +SyscallReturn writeFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target lseek() handler. +SyscallReturn lseekFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target munmap() handler. +SyscallReturn munmapFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target gethostname() handler. +SyscallReturn gethostnameFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target unlink() handler. +SyscallReturn unlinkFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target rename() handler. +SyscallReturn renameFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + + +/// Target truncate() handler. +SyscallReturn truncateFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + + +/// Target ftruncate() handler. +SyscallReturn ftruncateFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + + +/// Target chown() handler. +SyscallReturn chownFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + + +/// Target fchown() handler. +SyscallReturn fchownFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target dup() handler. +SyscallReturn dupFunc(SyscallDesc *desc, int num, + LiveProcess *process, ThreadContext *tc); + +/// Target fnctl() handler. +SyscallReturn fcntlFunc(SyscallDesc *desc, int num, + LiveProcess *process, ThreadContext *tc); + +/// Target fcntl64() handler. +SyscallReturn fcntl64Func(SyscallDesc *desc, int num, + LiveProcess *process, ThreadContext *tc); + +/// Target setuid() handler. +SyscallReturn setuidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getpid() handler. +SyscallReturn getpidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getuid() handler. +SyscallReturn getuidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getgid() handler. +SyscallReturn getgidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getppid() handler. +SyscallReturn getppidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target geteuid() handler. +SyscallReturn geteuidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getegid() handler. +SyscallReturn getegidFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + + + +/// Pseudo Funcs - These functions use a different return convension, +/// returning a second value in a register other than the normal return register +SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, + LiveProcess *process, ThreadContext *tc); + +/// Target getpidPseudo() handler. +SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getuidPseudo() handler. +SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + +/// Target getgidPseudo() handler. +SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, + LiveProcess *p, ThreadContext *tc); + + +/// A readable name for 1,000,000, for converting microseconds to seconds. +const int one_million = 1000000; + +/// Approximate seconds since the epoch (1/1/1970). About a billion, +/// by my reckoning. We want to keep this a constant (not use the +/// real-world time) to keep simulations repeatable. +const unsigned seconds_since_epoch = 1000000000; + +/// Helper function to convert current elapsed time to seconds and +/// microseconds. +template <class T1, class T2> +void +getElapsedTime(T1 &sec, T2 &usec) +{ + int elapsed_usecs = curTick / Clock::Int::us; + sec = elapsed_usecs / one_million; + usec = elapsed_usecs % one_million; +} + +////////////////////////////////////////////////////////////////////// +// +// The following emulation functions are generic, but need to be +// templated to account for differences in types, constants, etc. +// +////////////////////////////////////////////////////////////////////// + +#if NO_STAT64 + typedef struct stat hst_stat; + typedef struct stat hst_stat64; +#else + typedef struct stat hst_stat; + typedef struct stat64 hst_stat64; +#endif + +//// Helper function to convert a host stat buffer to a target stat +//// buffer. Also copies the target buffer out to the simulated +//// memory space. Used by stat(), fstat(), and lstat(). + +template <typename target_stat, typename host_stat> +static void +convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) +{ + if (fakeTTY) + tgt->st_dev = 0xA; + else + tgt->st_dev = host->st_dev; + tgt->st_dev = htog(tgt->st_dev); + tgt->st_ino = host->st_ino; + tgt->st_ino = htog(tgt->st_ino); + if (fakeTTY) + tgt->st_rdev = 0x880d; + else + tgt->st_rdev = host->st_rdev; + tgt->st_rdev = htog(tgt->st_rdev); + tgt->st_size = host->st_size; + tgt->st_size = htog(tgt->st_size); + tgt->st_atimeX = host->st_atime; + tgt->st_atimeX = htog(tgt->st_atimeX); + tgt->st_mtimeX = host->st_mtime; + tgt->st_mtimeX = htog(tgt->st_mtimeX); + tgt->st_ctimeX = host->st_ctime; + tgt->st_ctimeX = htog(tgt->st_ctimeX); + tgt->st_blksize = host->st_blksize; + tgt->st_blksize = htog(tgt->st_blksize); + tgt->st_blocks = host->st_blocks; + tgt->st_blocks = htog(tgt->st_blocks); +} + +// Same for stat64 + +template <typename target_stat, typename host_stat64> +static void +convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) +{ + convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); +#if defined(STAT_HAVE_NSEC) + tgt->st_atime_nsec = host->st_atime_nsec; + tgt->st_atime_nsec = htog(tgt->st_atime_nsec); + tgt->st_mtime_nsec = host->st_mtime_nsec; + tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec); + tgt->st_ctime_nsec = host->st_ctime_nsec; + tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec); +#else + tgt->st_atime_nsec = 0; + tgt->st_mtime_nsec = 0; + tgt->st_ctime_nsec = 0; +#endif +} + +//Here are a couple convenience functions +template<class OS> +static void +copyOutStatBuf(TranslatingPort * mem, Addr addr, + hst_stat *host, bool fakeTTY = false) +{ + typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; + tgt_stat_buf tgt(addr); + convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); + tgt.copyOut(mem); +} + +template<class OS> +static void +copyOutStat64Buf(TranslatingPort * mem, Addr addr, + hst_stat64 *host, bool fakeTTY = false) +{ + typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; + tgt_stat_buf tgt(addr); + convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); + tgt.copyOut(mem); +} + +/// Target ioctl() handler. For the most part, programs call ioctl() +/// only to find out if their stdout is a tty, to determine whether to +/// do line or block buffering. +template <class OS> +SyscallReturn +ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int fd = tc->getSyscallArg(0); + unsigned req = tc->getSyscallArg(1); + + DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req); + + if (fd < 0 || process->sim_fd(fd) < 0) { + // doesn't map to any simulator fd: not a valid target fd + return -EBADF; + } + + switch (req) { + case OS::TIOCISATTY: + case OS::TIOCGETP: + case OS::TIOCSETP: + case OS::TIOCSETN: + case OS::TIOCSETC: + case OS::TIOCGETC: + case OS::TIOCGETS: + case OS::TIOCGETA: + return -ENOTTY; + + default: + fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n", + fd, req, tc->readPC()); + } +} + +/// Target open() handler. +template <class OS> +SyscallReturn +openFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + + if (path == "/dev/sysdev0") { + // This is a memory-mapped high-resolution timer device on Alpha. + // We don't support it, so just punt. + warn("Ignoring open(%s, ...)\n", path); + return -ENOENT; + } + + int tgtFlags = tc->getSyscallArg(1); + int mode = tc->getSyscallArg(2); + int hostFlags = 0; + + // translate open flags + for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { + if (tgtFlags & OS::openFlagTable[i].tgtFlag) { + tgtFlags &= ~OS::openFlagTable[i].tgtFlag; + hostFlags |= OS::openFlagTable[i].hostFlag; + } + } + + // any target flags left? + if (tgtFlags != 0) + warn("Syscall: open: cannot decode flags 0x%x", tgtFlags); + +#ifdef __CYGWIN32__ + hostFlags |= O_BINARY; +#endif + + DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str()); + + // open the file + int fd = open(path.c_str(), hostFlags, mode); + + return (fd == -1) ? -errno : process->alloc_fd(fd); +} + + +/// Target chmod() handler. +template <class OS> +SyscallReturn +chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + + uint32_t mode = tc->getSyscallArg(1); + mode_t hostMode = 0; + + // XXX translate mode flags via OS::something??? + hostMode = mode; + + // do the chmod + int result = chmod(path.c_str(), hostMode); + if (result < 0) + return -errno; + + return 0; +} + + +/// Target fchmod() handler. +template <class OS> +SyscallReturn +fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int fd = tc->getSyscallArg(0); + if (fd < 0 || process->sim_fd(fd) < 0) { + // doesn't map to any simulator fd: not a valid target fd + return -EBADF; + } + + uint32_t mode = tc->getSyscallArg(1); + mode_t hostMode = 0; + + // XXX translate mode flags via OS::someting??? + hostMode = mode; + + // do the fchmod + int result = fchmod(process->sim_fd(fd), hostMode); + if (result < 0) + return -errno; + + return 0; +} + + +/// Target stat() handler. +template <class OS> +SyscallReturn +statFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + + struct stat hostBuf; + int result = stat(path.c_str(), &hostBuf); + + if (result < 0) + return -errno; + + copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf); + + return 0; +} + + +/// Target fstat64() handler. +template <class OS> +SyscallReturn +fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int fd = tc->getSyscallArg(0); + if (fd < 0 || process->sim_fd(fd) < 0) { + // doesn't map to any simulator fd: not a valid target fd + return -EBADF; + } + +#if NO_STAT64 + struct stat hostBuf; + int result = fstat(process->sim_fd(fd), &hostBuf); +#else + struct stat64 hostBuf; + int result = fstat64(process->sim_fd(fd), &hostBuf); +#endif + + if (result < 0) + return -errno; + + copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), + &hostBuf, (fd == 1)); + + return 0; +} + + +/// Target lstat() handler. +template <class OS> +SyscallReturn +lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + + struct stat hostBuf; + int result = lstat(path.c_str(), &hostBuf); + + if (result < 0) + return -errno; + + copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf); + + return 0; +} + +/// Target lstat64() handler. +template <class OS> +SyscallReturn +lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + +#if NO_STAT64 + struct stat hostBuf; + int result = lstat(path.c_str(), &hostBuf); +#else + struct stat64 hostBuf; + int result = lstat64(path.c_str(), &hostBuf); +#endif + + if (result < 0) + return -errno; + + copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf); + + return 0; +} + +/// Target fstat() handler. +template <class OS> +SyscallReturn +fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int fd = process->sim_fd(tc->getSyscallArg(0)); + + DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd); + + if (fd < 0) + return -EBADF; + + struct stat hostBuf; + int result = fstat(fd, &hostBuf); + + if (result < 0) + return -errno; + + copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), + &hostBuf, (fd == 1)); + + return 0; +} + + +/// Target statfs() handler. +template <class OS> +SyscallReturn +statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + + struct statfs hostBuf; + int result = statfs(path.c_str(), &hostBuf); + + if (result < 0) + return -errno; + + OS::copyOutStatfsBuf(tc->getMemPort(), + (Addr)(tc->getSyscallArg(1)), &hostBuf); + + return 0; +} + + +/// Target fstatfs() handler. +template <class OS> +SyscallReturn +fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int fd = process->sim_fd(tc->getSyscallArg(0)); + + if (fd < 0) + return -EBADF; + + struct statfs hostBuf; + int result = fstatfs(fd, &hostBuf); + + if (result < 0) + return -errno; + + OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1), + &hostBuf); + + return 0; +} + + +/// Target writev() handler. +template <class OS> +SyscallReturn +writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int fd = tc->getSyscallArg(0); + if (fd < 0 || process->sim_fd(fd) < 0) { + // doesn't map to any simulator fd: not a valid target fd + return -EBADF; + } + + TranslatingPort *p = tc->getMemPort(); + uint64_t tiov_base = tc->getSyscallArg(1); + size_t count = tc->getSyscallArg(2); + struct iovec hiov[count]; + for (int i = 0; i < count; ++i) + { + typename OS::tgt_iovec tiov; + + p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), + (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); + hiov[i].iov_len = gtoh(tiov.iov_len); + hiov[i].iov_base = new char [hiov[i].iov_len]; + p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, + hiov[i].iov_len); + } + + int result = writev(process->sim_fd(fd), hiov, count); + + for (int i = 0; i < count; ++i) + { + delete [] (char *)hiov[i].iov_base; + } + + if (result < 0) + return -errno; + + return 0; +} + + +/// Target mmap() handler. +/// +/// We don't really handle mmap(). If the target is mmaping an +/// anonymous region or /dev/zero, we can get away with doing basically +/// nothing (since memory is initialized to zero and the simulator +/// doesn't really check addresses anyway). Always print a warning, +/// since this could be seriously broken if we're not mapping +/// /dev/zero. +// +/// Someday we should explicitly check for /dev/zero in open, flag the +/// file descriptor, and fail (or implement!) a non-anonymous mmap to +/// anything else. +template <class OS> +SyscallReturn +mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) +{ + Addr start = tc->getSyscallArg(0); + uint64_t length = tc->getSyscallArg(1); + // int prot = tc->getSyscallArg(2); + int flags = tc->getSyscallArg(3); + // int fd = p->sim_fd(tc->getSyscallArg(4)); + // int offset = tc->getSyscallArg(5); + + if ((start % TheISA::VMPageSize) != 0 || + (length % TheISA::VMPageSize) != 0) { + warn("mmap failing: arguments not page-aligned: " + "start 0x%x length 0x%x", + start, length); + return -EINVAL; + } + + if (start != 0) { + warn("mmap: ignoring suggested map address 0x%x, using 0x%x", + start, p->mmap_end); + } + + // pick next address from our "mmap region" + start = p->mmap_end; + p->pTable->allocate(start, length); + p->mmap_end += length; + + if (!(flags & OS::TGT_MAP_ANONYMOUS)) { + warn("allowing mmap of file @ fd %d. " + "This will break if not /dev/zero.", tc->getSyscallArg(4)); + } + + return start; +} + +/// Target getrlimit() handler. +template <class OS> +SyscallReturn +getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + unsigned resource = tc->getSyscallArg(0); + TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1)); + + switch (resource) { + case OS::TGT_RLIMIT_STACK: + // max stack size in bytes: make up a number (2MB for now) + rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; + rlp->rlim_cur = htog(rlp->rlim_cur); + rlp->rlim_max = htog(rlp->rlim_max); + break; + + default: + std::cerr << "getrlimitFunc: unimplemented resource " << resource + << std::endl; + abort(); + break; + } + + rlp.copyOut(tc->getMemPort()); + return 0; +} + +/// Target gettimeofday() handler. +template <class OS> +SyscallReturn +gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0)); + + getElapsedTime(tp->tv_sec, tp->tv_usec); + tp->tv_sec += seconds_since_epoch; + tp->tv_sec = htog(tp->tv_sec); + tp->tv_usec = htog(tp->tv_usec); + + tp.copyOut(tc->getMemPort()); + + return 0; +} + + +/// Target utimes() handler. +template <class OS> +SyscallReturn +utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + std::string path; + + if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0))) + return -EFAULT; + + TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1)); + tp.copyIn(tc->getMemPort()); + + struct timeval hostTimeval[2]; + for (int i = 0; i < 2; ++i) + { + hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec); + hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec); + } + int result = utimes(path.c_str(), hostTimeval); + + if (result < 0) + return -errno; + + return 0; +} +/// Target getrusage() function. +template <class OS> +SyscallReturn +getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process, + ThreadContext *tc) +{ + int who = tc->getSyscallArg(0); // THREAD, SELF, or CHILDREN + TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1)); + + if (who != OS::TGT_RUSAGE_SELF) { + // don't really handle THREAD or CHILDREN, but just warn and + // plow ahead + warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", + who); + } + + getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); + rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec); + rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec); + + rup->ru_stime.tv_sec = 0; + rup->ru_stime.tv_usec = 0; + rup->ru_maxrss = 0; + rup->ru_ixrss = 0; + rup->ru_idrss = 0; + rup->ru_isrss = 0; + rup->ru_minflt = 0; + rup->ru_majflt = 0; + rup->ru_nswap = 0; + rup->ru_inblock = 0; + rup->ru_oublock = 0; + rup->ru_msgsnd = 0; + rup->ru_msgrcv = 0; + rup->ru_nsignals = 0; + rup->ru_nvcsw = 0; + rup->ru_nivcsw = 0; + + rup.copyOut(tc->getMemPort()); + + return 0; +} + + + + +#endif // __SIM_SYSCALL_EMUL_HH__ |