The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/linux32/linux.h

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    1 /*-
    2  * Copyright (c) 2004 Tim J. Robbins
    3  * Copyright (c) 2001 Doug Rabson
    4  * Copyright (c) 1994-1996 Søren Schmidt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD: stable/11/sys/amd64/linux32/linux.h 360451 2020-04-28 20:14:38Z brooks $
   31  */
   32 
   33 #ifndef _AMD64_LINUX_H_
   34 #define _AMD64_LINUX_H_
   35 
   36 #include <sys/abi_compat.h>
   37 
   38 #include <compat/linux/linux.h>
   39 #include <amd64/linux32/linux32_syscall.h>
   40 
   41 #define LINUX_LEGACY_SYSCALLS
   42 
   43 /*
   44  * debugging support
   45  */
   46 extern u_char linux_debug_map[];
   47 #define ldebug(name)    isclr(linux_debug_map, LINUX32_SYS_linux_ ## name)
   48 #define ARGS(nm, fmt)   "linux(%ld/%ld): "#nm"("fmt")\n",                       \
   49                         (long)td->td_proc->p_pid, (long)td->td_tid
   50 #define LMSG(fmt)       "linux(%ld/%ld): "fmt"\n",                              \
   51                         (long)td->td_proc->p_pid, (long)td->td_tid
   52 #define LINUX_DTRACE    linuxulator32
   53 
   54 #define LINUX32_MAXUSER         ((1ul << 32) - PAGE_SIZE)
   55 #define LINUX32_SHAREDPAGE      (LINUX32_MAXUSER - PAGE_SIZE)
   56 #define LINUX32_USRSTACK        LINUX32_SHAREDPAGE
   57 
   58 /* XXX 16 = sizeof(linux32_ps_strings) */
   59 #define LINUX32_PS_STRINGS      (LINUX32_USRSTACK - 16)
   60 #define LINUX32_MAXDSIZ         (512 * 1024 * 1024)     /* 512MB */
   61 #define LINUX32_MAXSSIZ         (64 * 1024 * 1024)      /* 64MB */
   62 #define LINUX32_MAXVMEM         0                       /* Unlimited */
   63 
   64 /*
   65  * Provide a separate set of types for the Linux types.
   66  */
   67 typedef int             l_int;
   68 typedef int32_t         l_long;
   69 typedef int64_t         l_longlong;
   70 typedef short           l_short;
   71 typedef unsigned int    l_uint;
   72 typedef uint32_t        l_ulong;
   73 typedef uint64_t        l_ulonglong;
   74 typedef unsigned short  l_ushort;
   75 
   76 typedef l_ulong         l_uintptr_t;
   77 typedef l_long          l_clock_t;
   78 typedef l_int           l_daddr_t;
   79 typedef l_ushort        l_dev_t;
   80 typedef l_uint          l_gid_t;
   81 typedef l_ushort        l_gid16_t;
   82 typedef l_ulong         l_ino_t;
   83 typedef l_int           l_key_t;
   84 typedef l_longlong      l_loff_t;
   85 typedef l_ushort        l_mode_t;
   86 typedef l_long          l_off_t;
   87 typedef l_int           l_pid_t;
   88 typedef l_uint          l_size_t;
   89 typedef l_long          l_suseconds_t;
   90 typedef l_long          l_time_t;
   91 typedef l_uint          l_uid_t;
   92 typedef l_ushort        l_uid16_t;
   93 typedef l_int           l_timer_t;
   94 typedef l_int           l_mqd_t;
   95 typedef l_ulong         l_fd_mask;
   96 
   97 typedef struct {
   98         l_int           val[2];
   99 } __packed l_fsid_t;
  100 
  101 typedef struct {
  102         l_time_t        tv_sec;
  103         l_suseconds_t   tv_usec;
  104 } l_timeval;
  105 
  106 #define l_fd_set        fd_set
  107 
  108 /*
  109  * Miscellaneous
  110  */
  111 #define LINUX_AT_COUNT          20      /* Count of used aux entry types.
  112                                          * Keep this synchronized with
  113                                          * linux_fixup_elf() code.
  114                                          */
  115 struct l___sysctl_args
  116 {
  117         l_uintptr_t     name;
  118         l_int           nlen;
  119         l_uintptr_t     oldval;
  120         l_uintptr_t     oldlenp;
  121         l_uintptr_t     newval;
  122         l_size_t        newlen;
  123         l_ulong         __spare[4];
  124 } __packed;
  125 
  126 /* Resource limits */
  127 #define LINUX_RLIMIT_CPU        0
  128 #define LINUX_RLIMIT_FSIZE      1
  129 #define LINUX_RLIMIT_DATA       2
  130 #define LINUX_RLIMIT_STACK      3
  131 #define LINUX_RLIMIT_CORE       4
  132 #define LINUX_RLIMIT_RSS        5
  133 #define LINUX_RLIMIT_NPROC      6
  134 #define LINUX_RLIMIT_NOFILE     7
  135 #define LINUX_RLIMIT_MEMLOCK    8
  136 #define LINUX_RLIMIT_AS         9       /* Address space limit */
  137 
  138 #define LINUX_RLIM_NLIMITS      10
  139 
  140 struct l_rlimit {
  141         l_ulong rlim_cur;
  142         l_ulong rlim_max;
  143 } __packed;
  144 
  145 struct l_rusage {
  146         l_timeval ru_utime;
  147         l_timeval ru_stime;
  148         l_long  ru_maxrss;
  149         l_long  ru_ixrss;
  150         l_long  ru_idrss;
  151         l_long  ru_isrss;
  152         l_long  ru_minflt;
  153         l_long  ru_majflt;
  154         l_long  ru_nswap;
  155         l_long  ru_inblock;
  156         l_long  ru_oublock;
  157         l_long  ru_msgsnd;
  158         l_long  ru_msgrcv;
  159         l_long  ru_nsignals;
  160         l_long  ru_nvcsw;
  161         l_long  ru_nivcsw;
  162 } __packed;
  163 
  164 struct l_mmap_argv {
  165         l_uintptr_t     addr;
  166         l_size_t        len;
  167         l_int           prot;
  168         l_int           flags;
  169         l_int           fd;
  170         l_ulong         pgoff;
  171 };
  172 
  173 /*
  174  * stat family of syscalls
  175  */
  176 struct l_timespec {
  177         l_time_t        tv_sec;
  178         l_long          tv_nsec;
  179 } __packed;
  180 
  181 struct l_newstat {
  182         l_ushort        st_dev;
  183         l_ushort        __pad1;
  184         l_ulong         st_ino;
  185         l_ushort        st_mode;
  186         l_ushort        st_nlink;
  187         l_ushort        st_uid;
  188         l_ushort        st_gid;
  189         l_ushort        st_rdev;
  190         l_ushort        __pad2;
  191         l_ulong         st_size;
  192         l_ulong         st_blksize;
  193         l_ulong         st_blocks;
  194         struct l_timespec       st_atim;
  195         struct l_timespec       st_mtim;
  196         struct l_timespec       st_ctim;
  197         l_ulong         __unused4;
  198         l_ulong         __unused5;
  199 } __packed;
  200 
  201 struct l_stat {
  202         l_ushort        st_dev;
  203         l_ulong         st_ino;
  204         l_ushort        st_mode;
  205         l_ushort        st_nlink;
  206         l_ushort        st_uid;
  207         l_ushort        st_gid;
  208         l_ushort        st_rdev;
  209         l_long          st_size;
  210         struct l_timespec       st_atim;
  211         struct l_timespec       st_mtim;
  212         struct l_timespec       st_ctim;
  213         l_long          st_blksize;
  214         l_long          st_blocks;
  215         l_ulong         st_flags;
  216         l_ulong         st_gen;
  217 };
  218 
  219 struct l_stat64 {
  220         l_ushort        st_dev;
  221         u_char          __pad0[10];
  222         l_ulong         __st_ino;
  223         l_uint          st_mode;
  224         l_uint          st_nlink;
  225         l_ulong         st_uid;
  226         l_ulong         st_gid;
  227         l_ushort        st_rdev;
  228         u_char          __pad3[10];
  229         l_longlong      st_size;
  230         l_ulong         st_blksize;
  231         l_ulong         st_blocks;
  232         l_ulong         __pad4;
  233         struct l_timespec       st_atim;
  234         struct l_timespec       st_mtim;
  235         struct l_timespec       st_ctim;
  236         l_ulonglong     st_ino;
  237 } __packed;
  238 
  239 struct l_statfs64 {
  240         l_int           f_type;
  241         l_int           f_bsize;
  242         uint64_t        f_blocks;
  243         uint64_t        f_bfree;
  244         uint64_t        f_bavail;
  245         uint64_t        f_files;
  246         uint64_t        f_ffree;
  247         l_fsid_t        f_fsid;
  248         l_int           f_namelen;
  249         l_int           f_frsize;
  250         l_int           f_flags;
  251         l_int           f_spare[4];
  252 } __packed;
  253 
  254 /* sigaction flags */
  255 #define LINUX_SA_NOCLDSTOP      0x00000001
  256 #define LINUX_SA_NOCLDWAIT      0x00000002
  257 #define LINUX_SA_SIGINFO        0x00000004
  258 #define LINUX_SA_RESTORER       0x04000000
  259 #define LINUX_SA_ONSTACK        0x08000000
  260 #define LINUX_SA_RESTART        0x10000000
  261 #define LINUX_SA_INTERRUPT      0x20000000
  262 #define LINUX_SA_NOMASK         0x40000000
  263 #define LINUX_SA_ONESHOT        0x80000000
  264 
  265 /* sigprocmask actions */
  266 #define LINUX_SIG_BLOCK         0
  267 #define LINUX_SIG_UNBLOCK       1
  268 #define LINUX_SIG_SETMASK       2
  269 
  270 /* sigaltstack */
  271 #define LINUX_MINSIGSTKSZ       2048
  272 
  273 typedef l_uintptr_t l_handler_t;
  274 typedef l_ulong l_osigset_t;
  275 
  276 typedef struct {
  277         l_handler_t     lsa_handler;
  278         l_osigset_t     lsa_mask;
  279         l_ulong         lsa_flags;
  280         l_uintptr_t     lsa_restorer;
  281 } __packed l_osigaction_t;
  282 
  283 typedef struct {
  284         l_handler_t     lsa_handler;
  285         l_ulong         lsa_flags;
  286         l_uintptr_t     lsa_restorer;
  287         l_sigset_t      lsa_mask;
  288 } __packed l_sigaction_t;
  289 
  290 typedef struct {
  291         l_uintptr_t     ss_sp;
  292         l_int           ss_flags;
  293         l_size_t        ss_size;
  294 } __packed l_stack_t;
  295 
  296 /* The Linux sigcontext, pretty much a standard 386 trapframe. */
  297 struct l_sigcontext {
  298         l_uint          sc_gs;
  299         l_uint          sc_fs;
  300         l_uint          sc_es;
  301         l_uint          sc_ds;
  302         l_uint          sc_edi;
  303         l_uint          sc_esi;
  304         l_uint          sc_ebp;
  305         l_uint          sc_esp;
  306         l_uint          sc_ebx;
  307         l_uint          sc_edx;
  308         l_uint          sc_ecx;
  309         l_uint          sc_eax;
  310         l_uint          sc_trapno;
  311         l_uint          sc_err;
  312         l_uint          sc_eip;
  313         l_uint          sc_cs;
  314         l_uint          sc_eflags;
  315         l_uint          sc_esp_at_signal;
  316         l_uint          sc_ss;
  317         l_uint          sc_387;
  318         l_uint          sc_mask;
  319         l_uint          sc_cr2;
  320 } __packed;
  321 
  322 struct l_ucontext {
  323         l_ulong         uc_flags;
  324         l_uintptr_t     uc_link;
  325         l_stack_t       uc_stack;
  326         struct l_sigcontext     uc_mcontext;
  327         l_sigset_t      uc_sigmask;
  328 } __packed;
  329 
  330 #define LINUX_SI_MAX_SIZE       128
  331 #define LINUX_SI_PAD_SIZE       ((LINUX_SI_MAX_SIZE/sizeof(l_int)) - 3)
  332 
  333 typedef union l_sigval {
  334         l_int           sival_int;
  335         l_uintptr_t     sival_ptr;
  336 } l_sigval_t;
  337 
  338 typedef struct l_siginfo {
  339         l_int           lsi_signo;
  340         l_int           lsi_errno;
  341         l_int           lsi_code;
  342         union {
  343                 l_int   _pad[LINUX_SI_PAD_SIZE];
  344 
  345                 struct {
  346                         l_pid_t         _pid;
  347                         l_uid_t         _uid;
  348                 } __packed _kill;
  349 
  350                 struct {
  351                         l_timer_t       _tid;
  352                         l_int           _overrun;
  353                         char            _pad[sizeof(l_uid_t) - sizeof(l_int)];
  354                         l_sigval_t      _sigval;
  355                         l_int           _sys_private;
  356                 } __packed _timer;
  357 
  358                 struct {
  359                         l_pid_t         _pid;           /* sender's pid */
  360                         l_uid_t         _uid;           /* sender's uid */
  361                         l_sigval_t      _sigval;
  362                 } __packed _rt;
  363 
  364                 struct {
  365                         l_pid_t         _pid;           /* which child */
  366                         l_uid_t         _uid;           /* sender's uid */
  367                         l_int           _status;        /* exit code */
  368                         l_clock_t       _utime;
  369                         l_clock_t       _stime;
  370                 } __packed _sigchld;
  371 
  372                 struct {
  373                         l_uintptr_t     _addr;  /* Faulting insn/memory ref. */
  374                 } __packed _sigfault;
  375 
  376                 struct {
  377                         l_long          _band;  /* POLL_IN,POLL_OUT,POLL_MSG */
  378                         l_int           _fd;
  379                 } __packed _sigpoll;
  380         } _sifields;
  381 } __packed l_siginfo_t;
  382 
  383 #define lsi_pid         _sifields._kill._pid
  384 #define lsi_uid         _sifields._kill._uid
  385 #define lsi_tid         _sifields._timer._tid
  386 #define lsi_overrun     _sifields._timer._overrun
  387 #define lsi_sys_private _sifields._timer._sys_private
  388 #define lsi_status      _sifields._sigchld._status
  389 #define lsi_utime       _sifields._sigchld._utime
  390 #define lsi_stime       _sifields._sigchld._stime
  391 #define lsi_value       _sifields._rt._sigval
  392 #define lsi_int         _sifields._rt._sigval.sival_int
  393 #define lsi_ptr         _sifields._rt._sigval.sival_ptr
  394 #define lsi_addr        _sifields._sigfault._addr
  395 #define lsi_band        _sifields._sigpoll._band
  396 #define lsi_fd          _sifields._sigpoll._fd
  397 
  398 struct l_fpreg {
  399         u_int16_t       significand[4];
  400         u_int16_t       exponent;
  401 } __packed;
  402 
  403 struct l_fpxreg {
  404         u_int16_t       significand[4];
  405         u_int16_t       exponent;
  406         u_int16_t       padding[3];
  407 } __packed;
  408 
  409 struct l_xmmreg {
  410         u_int32_t       element[4];
  411 } __packed;
  412 
  413 struct l_fpstate {
  414         /* Regular FPU environment */
  415         u_int32_t               cw;
  416         u_int32_t               sw;
  417         u_int32_t               tag;
  418         u_int32_t               ipoff;
  419         u_int32_t               cssel;
  420         u_int32_t               dataoff;
  421         u_int32_t               datasel;
  422         struct l_fpreg          _st[8];
  423         u_int16_t               status;
  424         u_int16_t               magic;          /* 0xffff = regular FPU data */
  425 
  426         /* FXSR FPU environment */
  427         u_int32_t               _fxsr_env[6];   /* env is ignored. */
  428         u_int32_t               mxcsr;
  429         u_int32_t               reserved;
  430         struct l_fpxreg         _fxsr_st[8];    /* reg data is ignored. */
  431         struct l_xmmreg         _xmm[8];
  432         u_int32_t               padding[56];
  433 } __packed;
  434 
  435 /*
  436  * We make the stack look like Linux expects it when calling a signal
  437  * handler, but use the BSD way of calling the handler and sigreturn().
  438  * This means that we need to pass the pointer to the handler too.
  439  * It is appended to the frame to not interfere with the rest of it.
  440  */
  441 struct l_sigframe {
  442         l_int                   sf_sig;
  443         struct l_sigcontext     sf_sc;
  444         struct l_fpstate        sf_fpstate;
  445         l_uint                  sf_extramask[1];
  446         l_handler_t             sf_handler;
  447 } __packed;
  448 
  449 struct l_rt_sigframe {
  450         l_int                   sf_sig;
  451         l_uintptr_t             sf_siginfo;
  452         l_uintptr_t             sf_ucontext;
  453         l_siginfo_t             sf_si;
  454         struct l_ucontext       sf_sc;
  455         l_handler_t             sf_handler;
  456 } __packed;
  457 
  458 /*
  459  * arch specific open/fcntl flags
  460  */
  461 #define LINUX_F_GETLK64         12
  462 #define LINUX_F_SETLK64         13
  463 #define LINUX_F_SETLKW64        14
  464 
  465 union l_semun {
  466         l_int           val;
  467         l_uintptr_t     buf;
  468         l_uintptr_t     array;
  469         l_uintptr_t     __buf;
  470         l_uintptr_t     __pad;
  471 } __packed;
  472 
  473 struct l_sockaddr {
  474         l_ushort        sa_family;
  475         char            sa_data[14];
  476 } __packed;
  477 
  478 struct l_ifmap {
  479         l_ulong         mem_start;
  480         l_ulong         mem_end;
  481         l_ushort        base_addr;
  482         u_char          irq;
  483         u_char          dma;
  484         u_char          port;
  485 } __packed;
  486 
  487 #define LINUX_IFHWADDRLEN       6
  488 #define LINUX_IFNAMSIZ          16
  489 
  490 struct l_ifreq {
  491         union {
  492                 char    ifrn_name[LINUX_IFNAMSIZ];
  493         } ifr_ifrn;
  494 
  495         union {
  496                 struct l_sockaddr       ifru_addr;
  497                 struct l_sockaddr       ifru_dstaddr;
  498                 struct l_sockaddr       ifru_broadaddr;
  499                 struct l_sockaddr       ifru_netmask;
  500                 struct l_sockaddr       ifru_hwaddr;
  501                 l_short         ifru_flags[1];
  502                 l_int           ifru_ivalue;
  503                 l_int           ifru_mtu;
  504                 struct l_ifmap  ifru_map;
  505                 char            ifru_slave[LINUX_IFNAMSIZ];
  506                 l_uintptr_t     ifru_data;
  507         } ifr_ifru;
  508 } __packed;
  509 
  510 #define ifr_name        ifr_ifrn.ifrn_name      /* Interface name */
  511 #define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address */
  512 #define ifr_ifindex     ifr_ifru.ifru_ivalue    /* Interface index */
  513 
  514 struct l_ifconf {
  515         int     ifc_len;
  516         union {
  517                 l_uintptr_t     ifcu_buf;
  518                 l_uintptr_t     ifcu_req;
  519         } ifc_ifcu;
  520 } __packed;
  521 
  522 #define ifc_buf         ifc_ifcu.ifcu_buf
  523 #define ifc_req         ifc_ifcu.ifcu_req
  524 
  525 /*
  526  * poll()
  527  */
  528 #define LINUX_POLLIN            0x0001
  529 #define LINUX_POLLPRI           0x0002
  530 #define LINUX_POLLOUT           0x0004
  531 #define LINUX_POLLERR           0x0008
  532 #define LINUX_POLLHUP           0x0010
  533 #define LINUX_POLLNVAL          0x0020
  534 #define LINUX_POLLRDNORM        0x0040
  535 #define LINUX_POLLRDBAND        0x0080
  536 #define LINUX_POLLWRNORM        0x0100
  537 #define LINUX_POLLWRBAND        0x0200
  538 #define LINUX_POLLMSG           0x0400
  539 
  540 struct l_pollfd {
  541         l_int           fd;
  542         l_short         events;
  543         l_short         revents;
  544 } __packed;
  545 
  546 struct l_user_desc {
  547         l_uint          entry_number;
  548         l_uint          base_addr;
  549         l_uint          limit;
  550         l_uint          seg_32bit:1;
  551         l_uint          contents:2;
  552         l_uint          read_exec_only:1;
  553         l_uint          limit_in_pages:1;
  554         l_uint          seg_not_present:1;
  555         l_uint          useable:1;
  556 };
  557 
  558 #define LINUX_LOWERWORD 0x0000ffff
  559 
  560 /*
  561  * Macros which does the same thing as those in Linux include/asm-um/ldt-i386.h.
  562  * These convert Linux user space descriptor to machine one.
  563  */
  564 #define LINUX_LDT_entry_a(info)                                 \
  565         ((((info)->base_addr & LINUX_LOWERWORD) << 16) |        \
  566         ((info)->limit & LINUX_LOWERWORD))
  567 
  568 #define LINUX_ENTRY_B_READ_EXEC_ONLY    9
  569 #define LINUX_ENTRY_B_CONTENTS          10
  570 #define LINUX_ENTRY_B_SEG_NOT_PRESENT   15
  571 #define LINUX_ENTRY_B_BASE_ADDR         16
  572 #define LINUX_ENTRY_B_USEABLE           20
  573 #define LINUX_ENTRY_B_SEG32BIT          22
  574 #define LINUX_ENTRY_B_LIMIT             23
  575 
  576 #define LINUX_LDT_entry_b(info)                                                 \
  577         (((info)->base_addr & 0xff000000) |                                     \
  578         ((info)->limit & 0xf0000) |                                             \
  579         ((info)->contents << LINUX_ENTRY_B_CONTENTS) |                          \
  580         (((info)->seg_not_present == 0) << LINUX_ENTRY_B_SEG_NOT_PRESENT) |     \
  581         (((info)->base_addr & 0x00ff0000) >> LINUX_ENTRY_B_BASE_ADDR) |         \
  582         (((info)->read_exec_only == 0) << LINUX_ENTRY_B_READ_EXEC_ONLY) |       \
  583         ((info)->seg_32bit << LINUX_ENTRY_B_SEG32BIT) |                         \
  584         ((info)->useable << LINUX_ENTRY_B_USEABLE) |                            \
  585         ((info)->limit_in_pages << LINUX_ENTRY_B_LIMIT) | 0x7000)
  586 
  587 #define LINUX_LDT_empty(info)           \
  588         ((info)->base_addr == 0 &&      \
  589         (info)->limit == 0 &&           \
  590         (info)->contents == 0 &&        \
  591         (info)->seg_not_present == 1 && \
  592         (info)->read_exec_only == 1 &&  \
  593         (info)->seg_32bit == 0 &&       \
  594         (info)->limit_in_pages == 0 &&  \
  595         (info)->useable == 0)
  596 
  597 /*
  598  * Macros for converting segments.
  599  * They do the same as those in arch/i386/kernel/process.c in Linux.
  600  */
  601 #define LINUX_GET_BASE(desc)                            \
  602         ((((desc)->a >> 16) & LINUX_LOWERWORD) |        \
  603         (((desc)->b << 16) & 0x00ff0000) |              \
  604         ((desc)->b & 0xff000000))
  605 
  606 #define LINUX_GET_LIMIT(desc)                   \
  607         (((desc)->a & LINUX_LOWERWORD) |        \
  608         ((desc)->b & 0xf0000))
  609 
  610 #define LINUX_GET_32BIT(desc)           \
  611         (((desc)->b >> LINUX_ENTRY_B_SEG32BIT) & 1)
  612 #define LINUX_GET_CONTENTS(desc)        \
  613         (((desc)->b >> LINUX_ENTRY_B_CONTENTS) & 3)
  614 #define LINUX_GET_WRITABLE(desc)        \
  615         (((desc)->b >> LINUX_ENTRY_B_READ_EXEC_ONLY) & 1)
  616 #define LINUX_GET_LIMIT_PAGES(desc)     \
  617         (((desc)->b >> LINUX_ENTRY_B_LIMIT) & 1)
  618 #define LINUX_GET_PRESENT(desc)         \
  619         (((desc)->b >> LINUX_ENTRY_B_SEG_NOT_PRESENT) & 1)
  620 #define LINUX_GET_USEABLE(desc)         \
  621         (((desc)->b >> LINUX_ENTRY_B_USEABLE) & 1)
  622 
  623 struct iovec;
  624 struct uio;
  625 
  626 struct l_iovec32 {
  627         uint32_t        iov_base;
  628         l_size_t        iov_len;
  629 };
  630 
  631 int linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt,
  632                             struct iovec **iovp, int error);
  633 int linux32_copyinuio(struct l_iovec32 *iovp, l_ulong iovcnt,
  634                             struct uio **uiop);
  635 int linux_copyout_rusage(struct rusage *ru, void *uaddr);
  636 
  637 /* robust futexes */
  638 struct linux_robust_list {
  639         l_uintptr_t                     next;
  640 };
  641 
  642 struct linux_robust_list_head {
  643         struct linux_robust_list        list;
  644         l_long                          futex_offset;
  645         l_uintptr_t                     pending_list;
  646 };
  647 
  648 #endif /* !_AMD64_LINUX_H_ */

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