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/sys/sysent.h

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    1 /*-
    2  * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/8.1/sys/sys/sysent.h 206347 2010-04-07 14:28:47Z kib $
   30  */
   31 
   32 #ifndef _SYS_SYSENT_H_
   33 #define _SYS_SYSENT_H_
   34 
   35 #include <bsm/audit.h>
   36 
   37 struct rlimit;
   38 struct sysent;
   39 struct thread;
   40 struct ksiginfo;
   41 
   42 typedef int     sy_call_t(struct thread *, void *);
   43 
   44 /* Used by the machine dependent syscall() code. */
   45 typedef void (*systrace_probe_func_t)(u_int32_t, int, struct sysent *, void *);
   46 
   47 /*
   48  * Used by loaded syscalls to convert arguments to a DTrace array
   49  * of 64-bit arguments.
   50  */
   51 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *);
   52 
   53 extern systrace_probe_func_t    systrace_probe_func;
   54 
   55 struct sysent {                 /* system call table */
   56         int     sy_narg;        /* number of arguments */
   57         sy_call_t *sy_call;     /* implementing function */
   58         au_event_t sy_auevent;  /* audit event associated with syscall */
   59         systrace_args_func_t sy_systrace_args_func;
   60                                 /* optional argument conversion function. */
   61         u_int32_t sy_entry;     /* DTrace entry ID for systrace. */
   62         u_int32_t sy_return;    /* DTrace return ID for systrace. */
   63         u_int32_t sy_flags;     /* General flags for system calls. */
   64 };
   65 
   66 struct image_params;
   67 struct __sigset;
   68 struct trapframe;
   69 struct vnode;
   70 
   71 struct sysentvec {
   72         int             sv_size;        /* number of entries */
   73         struct sysent   *sv_table;      /* pointer to sysent */
   74         u_int           sv_mask;        /* optional mask to index */
   75         int             sv_sigsize;     /* size of signal translation table */
   76         int             *sv_sigtbl;     /* signal translation table */
   77         int             sv_errsize;     /* size of errno translation table */
   78         int             *sv_errtbl;     /* errno translation table */
   79         int             (*sv_transtrap)(int, int);
   80                                         /* translate trap-to-signal mapping */
   81         int             (*sv_fixup)(register_t **, struct image_params *);
   82                                         /* stack fixup function */
   83         void            (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
   84                                         /* send signal */
   85         char            *sv_sigcode;    /* start of sigtramp code */
   86         int             *sv_szsigcode;  /* size of sigtramp code */
   87         void            (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
   88                             caddr_t *);
   89         char            *sv_name;       /* name of binary type */
   90         int             (*sv_coredump)(struct thread *, struct vnode *, off_t);
   91                                         /* function to dump core, or NULL */
   92         int             (*sv_imgact_try)(struct image_params *);
   93         int             sv_minsigstksz; /* minimum signal stack size */
   94         int             sv_pagesize;    /* pagesize */
   95         vm_offset_t     sv_minuser;     /* VM_MIN_ADDRESS */
   96         vm_offset_t     sv_maxuser;     /* VM_MAXUSER_ADDRESS */
   97         vm_offset_t     sv_usrstack;    /* USRSTACK */
   98         vm_offset_t     sv_psstrings;   /* PS_STRINGS */
   99         int             sv_stackprot;   /* vm protection for stack */
  100         register_t      *(*sv_copyout_strings)(struct image_params *);
  101         void            (*sv_setregs)(struct thread *, u_long, u_long, u_long);
  102         void            (*sv_fixlimit)(struct rlimit *, int);
  103         u_long          *sv_maxssiz;
  104         u_int           sv_flags;
  105 };
  106 
  107 #define SV_ILP32        0x000100
  108 #define SV_LP64         0x000200
  109 #define SV_IA32         0x004000
  110 #define SV_AOUT         0x008000
  111 
  112 #define SV_ABI_MASK     0xff
  113 #define SV_CURPROC_FLAG(x) (curproc->p_sysent->sv_flags & (x))
  114 #define SV_CURPROC_ABI() (curproc->p_sysent->sv_flags & SV_ABI_MASK)
  115 /* same as ELFOSABI_XXX, to prevent header pollution */
  116 #define SV_ABI_LINUX    3
  117 #define SV_ABI_FREEBSD  9
  118 #define SV_ABI_UNDEF    255
  119 
  120 #ifdef _KERNEL
  121 extern struct sysentvec aout_sysvec;
  122 extern struct sysentvec elf_freebsd_sysvec;
  123 extern struct sysentvec null_sysvec;
  124 extern struct sysent sysent[];
  125 
  126 #define NO_SYSCALL (-1)
  127 
  128 struct module;
  129 
  130 struct syscall_module_data {
  131         int     (*chainevh)(struct module *, int, void *); /* next handler */
  132         void    *chainarg;              /* arg for next event handler */
  133         int     *offset;                /* offset into sysent */
  134         struct sysent *new_sysent;      /* new sysent */
  135         struct sysent old_sysent;       /* old sysent */
  136 };
  137 
  138 #define MAKE_SYSENT(syscallname)                                \
  139 static struct sysent syscallname##_sysent = {                   \
  140         (sizeof(struct syscallname ## _args )                   \
  141             / sizeof(register_t)),                              \
  142         (sy_call_t *)& syscallname,                             \
  143         SYS_AUE_##syscallname                                   \
  144 }
  145 
  146 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg)      \
  147 static struct syscall_module_data name##_syscall_mod = {        \
  148         evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL }     \
  149 };                                                              \
  150                                                                 \
  151 static moduledata_t name##_mod = {                              \
  152         "sys/" #name,                                           \
  153         syscall_module_handler,                                 \
  154         &name##_syscall_mod                                     \
  155 };                                                              \
  156 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
  157 
  158 #define SYSCALL_MODULE_HELPER(syscallname)                      \
  159 static int syscallname##_syscall = SYS_##syscallname;           \
  160 MAKE_SYSENT(syscallname);                                       \
  161 SYSCALL_MODULE(syscallname,                                     \
  162     & syscallname##_syscall, & syscallname##_sysent,            \
  163     NULL, NULL)
  164 
  165 #define SYSCALL_MODULE_PRESENT(syscallname)                             \
  166         (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys &&  \
  167         sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
  168 
  169 /*
  170  * Syscall registration helpers with resource allocation handling.
  171  */
  172 struct syscall_helper_data {
  173         struct sysent new_sysent;
  174         struct sysent old_sysent;
  175         int syscall_no;
  176         int registered;
  177 };
  178 #define SYSCALL_INIT_HELPER(syscallname) {                      \
  179     .new_sysent = {                                             \
  180         .sy_narg = (sizeof(struct syscallname ## _args )        \
  181             / sizeof(register_t)),                              \
  182         .sy_call = (sy_call_t *)& syscallname,                  \
  183         .sy_auevent = SYS_AUE_##syscallname                     \
  184     },                                                          \
  185     .syscall_no = SYS_##syscallname                             \
  186 }
  187 #define SYSCALL_INIT_LAST {                                     \
  188     .syscall_no = NO_SYSCALL                                    \
  189 }
  190 
  191 int     syscall_register(int *offset, struct sysent *new_sysent,
  192             struct sysent *old_sysent);
  193 int     syscall_deregister(int *offset, struct sysent *old_sysent);
  194 int     syscall_module_handler(struct module *mod, int what, void *arg);
  195 int     syscall_helper_register(struct syscall_helper_data *sd);
  196 int     syscall_helper_unregister(struct syscall_helper_data *sd);
  197 
  198 /* Special purpose system call functions. */
  199 struct nosys_args;
  200 
  201 int     lkmnosys(struct thread *, struct nosys_args *);
  202 int     lkmressys(struct thread *, struct nosys_args *);
  203 
  204 #endif /* _KERNEL */
  205 
  206 #endif /* !_SYS_SYSENT_H_ */

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