linux.hh

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/*
 * Copyright (c) 2021 Arm Limited
 * 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) 2004-2009 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.
 */
 
#ifndef __LINUX_HH__
#define __LINUX_HH__
 
#include <string>
 
#include "base/random.hh"
#include "base/types.hh"
#include "kern/operatingsystem.hh"
#include "sim/process.hh"
 
namespace gem5
{
 
class ThreadContext;
 
class Linux : public OperatingSystem
{
 
  public:
 
    typedef uint64_t size_t;
    typedef uint64_t off_t;
    typedef int64_t time_t;
    typedef int64_t clock_t;
    typedef uint32_t uid_t;
    typedef uint32_t gid_t;
 
    struct tgt_stat
    {
        uint32_t        st_dev;         
        uint32_t        st_ino;         
        uint32_t        st_mode;        
        uint32_t        st_nlink;       
        uint32_t        st_uid;         
        uint32_t        st_gid;         
        uint32_t        st_rdev;        
        int32_t         _pad1;          
        int64_t         st_size;        
        uint64_t        st_atimeX;      
        uint64_t        st_mtimeX;      
        uint64_t        st_ctimeX;      
        uint32_t        st_blksize;     
        int32_t         st_blocks;      
        uint32_t        st_flags;       
        uint32_t        st_gen;         
    };
 
    // same for stat64
    struct tgt_stat64
    {
        uint64_t        st_dev;
        uint64_t        st_ino;
        uint64_t        st_rdev;
        int64_t         st_size;
        uint64_t        st_blocks;
 
        uint32_t        st_mode;
        uint32_t        st_uid;
        uint32_t        st_gid;
        uint32_t        st_blksize;
        uint32_t        st_nlink;
        uint32_t        __pad0;
 
        uint64_t        st_atimeX;
        uint64_t        st_atime_nsec;
        uint64_t        st_mtimeX;
        uint64_t        st_mtime_nsec;
        uint64_t        st_ctimeX;
        uint64_t        st_ctime_nsec;
        int64_t         ___unused[3];
    };
 
    static const int _SYS_NMLN = 65;
 
    struct utsname
    {
        char sysname[_SYS_NMLN];        
        char nodename[_SYS_NMLN];       
        char release[_SYS_NMLN];        
        char version[_SYS_NMLN];        
        char machine[_SYS_NMLN];        
    };
 
    struct rlimit
    {
        uint64_t  rlim_cur;     
        uint64_t  rlim_max;     
    };
 
    struct timeval
    {
        int64_t tv_sec;         
        int64_t tv_usec;        
    };
 
    struct timespec
    {
        time_t tv_sec;         
        int64_t tv_nsec;        
    };
 
    static const int M5_SC_CLK_TCK = 100;
 
    struct tms
    {
        int64_t tms_utime;      
        int64_t tms_stime;      
        int64_t tms_cutime;     
        int64_t tms_cstime;     
    };
 
    // For writev/readv
    struct tgt_iovec
    {
        uint64_t iov_base; // void *
        uint64_t iov_len;
    };
 
    // For select().
    // linux-3.14-src/include/uapi/linux/posix_types.h
    struct fd_set
    {
#ifndef LINUX__FD_SETSIZE
#define LINUX__FD_SETSIZE 1024
        unsigned long fds_bits[LINUX__FD_SETSIZE / (8 * sizeof(long))];
#endif
    };
 
    static const unsigned TGT_TCGETS     = 0x5401;
    static const unsigned TGT_TCGETA     = 0x5405;
    static const unsigned TGT_TCSETAW    = 0x5407;
    static const unsigned TGT_FIONREAD   = 0x541B;
 
    static bool
    isTtyReq(unsigned req)
    {
        switch (req) {
          case TGT_FIONREAD:
          case TGT_TCSETAW:
          case TGT_TCGETS:
          case TGT_TCGETA:
            return true;
          default:
            return false;
        }
    }
 
 
    static const unsigned TGT_RLIMIT_CPU = 0;
    static const unsigned TGT_RLIMIT_FSIZE = 1;
    static const unsigned TGT_RLIMIT_DATA = 2;
    static const unsigned TGT_RLIMIT_STACK = 3;
    static const unsigned TGT_RLIMIT_CORE = 4;
    static const unsigned TGT_RLIMIT_RSS = 5;
    static const unsigned TGT_RLIMIT_NPROC = 6;
    static const unsigned TGT_RLIMIT_NOFILE = 7;
    static const unsigned TGT_RLIMIT_MEMLOCK = 8;
    static const unsigned TGT_RLIMIT_AS = 9;
    static const unsigned TGT_RLIMIT_LOCKS = 10;
    static const unsigned TGT_RLIMIT_SIGPENDING = 11;
    static const unsigned TGT_RLIMIT_MSGQUEUE = 12;
    static const unsigned TGT_RLIMIT_NICE = 13;
    static const unsigned TGT_RLIMIT_RTPRIO = 14;
    static const unsigned TGT_RLIMIT_RTTIME = 15;
    static const unsigned TGT_RLIM_NLIMITS = 16;
 
    static const int TGT_RUSAGE_SELF     = 0;
    static const int TGT_RUSAGE_CHILDREN = -1;
    static const int TGT_RUSAGE_BOTH     = -2;
 
    struct rusage
    {
        struct timeval ru_utime;        
        struct timeval ru_stime;        
        int64_t ru_maxrss;              
        int64_t ru_ixrss;               
        int64_t ru_idrss;               
        int64_t ru_isrss;               
        int64_t ru_minflt;              
        int64_t ru_majflt;              
        int64_t ru_nswap;               
        int64_t ru_inblock;             
        int64_t ru_oublock;             
        int64_t ru_msgsnd;              
        int64_t ru_msgrcv;              
        int64_t ru_nsignals;            
        int64_t ru_nvcsw;               
        int64_t ru_nivcsw;              
    };
 
    // For /dev/urandom accesses
    static Random random;
 
    static int openSpecialFile(std::string path, Process *process,
                               ThreadContext *tc);
    static std::string procMeminfo(Process *process, ThreadContext *tc);
    static std::string etcPasswd(Process *process, ThreadContext *tc);
    static std::string procSelfMaps(Process *process, ThreadContext *tc);
    static std::string cpuOnline(Process *process, ThreadContext *tc);
    static std::string devRandom(Process *process, ThreadContext *tc);
 
    // For futex system call
    static const unsigned TGT_FUTEX_WAIT                = 0;
    static const unsigned TGT_FUTEX_WAKE                = 1;
    static const unsigned TGT_FUTEX_REQUEUE             = 3;
    static const unsigned TGT_FUTEX_CMP_REQUEUE         = 4;
    static const unsigned TGT_FUTEX_WAKE_OP             = 5;
    static const unsigned TGT_FUTEX_WAIT_BITSET         = 9;
    static const unsigned TGT_FUTEX_WAKE_BITSET         = 10;
    static const unsigned TGT_EAGAIN                    = 11;
    static const unsigned TGT_EWOULDBLOCK               = TGT_EAGAIN;
    static const unsigned TGT_FUTEX_PRIVATE_FLAG        = 128;
    static const unsigned TGT_FUTEX_CLOCK_REALTIME_FLAG = 256;
    // op field of futex_wake_op operation
    static const unsigned TGT_FUTEX_OP_SET  = 0; // uaddr2 = oparg;
    static const unsigned TGT_FUTEX_OP_ADD  = 1; // uaddr2 += oparg;
    static const unsigned TGT_FUTEX_OP_OR   = 2; // uaddr2 |= oparg;
    static const unsigned TGT_FUTEX_OP_ANDN = 3; // uaddr2 &= ~oparg;
    static const unsigned TGT_FUTEX_OP_XOR  = 4; // uaddr2 ^= oparg;
    // Use (1 << oparg) as operand
    static const unsigned TGT_FUTEX_OP_ARG_SHIFT = 8;
    // cmp field of futex_wake_op operation
    static const unsigned TGT_FUTEX_OP_CMP_EQ = 0;
    static const unsigned TGT_FUTEX_OP_CMP_NE = 1;
    static const unsigned TGT_FUTEX_OP_CMP_LT = 2;
    static const unsigned TGT_FUTEX_OP_CMP_LE = 3;
    static const unsigned TGT_FUTEX_OP_CMP_GT = 4;
    static const unsigned TGT_FUTEX_OP_CMP_GE = 5;
 
    // for *at syscalls
    static const int TGT_AT_FDCWD     = -100;
    static const int TGT_AT_REMOVEDIR = 0x200;
    static const int TGT_AT_SYMLINK_FOLLOW = 0x400;
    static const int TGT_AT_NO_AUTOMOUNT = 0x800;
    static const int TGT_AT_EMPTY_PATH = 0x1000;
 
    // for MREMAP
    static const unsigned TGT_MREMAP_MAYMOVE    = 0x1;
    static const unsigned TGT_MREMAP_FIXED      = 0x2;
 
    static const unsigned TGT_CLONE_VM              = 0x00000100;
    static const unsigned TGT_CLONE_FS              = 0x00000200;
    static const unsigned TGT_CLONE_FILES           = 0x00000400;
    static const unsigned TGT_CLONE_SIGHAND         = 0x00000800;
    static const unsigned TGT_CLONE_PIDFD           = 0x00001000;
    static const unsigned TGT_CLONE_PTRACE          = 0x00002000;
    static const unsigned TGT_CLONE_VFORK           = 0x00004000;
    static const unsigned TGT_CLONE_PARENT          = 0x00008000;
    static const unsigned TGT_CLONE_THREAD          = 0x00010000;
    static const unsigned TGT_CLONE_NEWNS           = 0x00020000;
    static const unsigned TGT_CLONE_SYSVSEM         = 0x00040000;
    static const unsigned TGT_CLONE_SETTLS          = 0x00080000;
    static const unsigned TGT_CLONE_PARENT_SETTID   = 0x00100000;
    static const unsigned TGT_CLONE_CHILD_CLEARTID  = 0x00200000;
    static const unsigned TGT_CLONE_DETACHED        = 0x00400000;
    static const unsigned TGT_CLONE_UNTRACED        = 0x00800000;
    static const unsigned TGT_CLONE_CHILD_SETTID    = 0x01000000;
    static const unsigned TGT_CLONE_NEWUTS          = 0x04000000;
    static const unsigned TGT_CLONE_NEWIPC          = 0x08000000;
    static const unsigned TGT_CLONE_NEWUSER         = 0x10000000;
    static const unsigned TGT_CLONE_NEWPID          = 0x20000000;
    static const unsigned TGT_CLONE_NEWNET          = 0x40000000;
    static const unsigned TGT_CLONE_IO              = 0x80000000;
 
    // linux-3.13-src/include/uapi/linux/wait.h
    static const unsigned TGT_WNOHANG               = 0x00000001;
    static const unsigned TGT_WUNTRACED             = 0x00000002;
    static const unsigned TGT_WSTOPPED              = TGT_WUNTRACED;
    static const unsigned TGT_WEXITED               = 0x00000004;
    static const unsigned TGT_WCONTINUED            = 0x00000008;
    static const unsigned TGT_WNOWAIT               = 0x01000000;
};  // class Linux
 
} // namespace gem5
 
#endif // __LINUX_HH__