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/10.2/sys/sys/sysent.h 237476 2012-06-23 10:14:51Z 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     int);
   47 
   48 /*
   49  * Used by loaded syscalls to convert arguments to a DTrace array
   50  * of 64-bit arguments.
   51  */
   52 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *);
   53 
   54 extern systrace_probe_func_t    systrace_probe_func;
   55 
   56 struct sysent {                 /* system call table */
   57         int     sy_narg;        /* number of arguments */
   58         sy_call_t *sy_call;     /* implementing function */
   59         au_event_t sy_auevent;  /* audit event associated with syscall */
   60         systrace_args_func_t sy_systrace_args_func;
   61                                 /* optional argument conversion function. */
   62         u_int32_t sy_entry;     /* DTrace entry ID for systrace. */
   63         u_int32_t sy_return;    /* DTrace return ID for systrace. */
   64         u_int32_t sy_flags;     /* General flags for system calls. */
   65         u_int32_t sy_thrcnt;
   66 };
   67 
   68 /*
   69  * A system call is permitted in capability mode.
   70  */
   71 #define SYF_CAPENABLED  0x00000001
   72 
   73 #define SY_THR_FLAGMASK 0x7
   74 #define SY_THR_STATIC   0x1
   75 #define SY_THR_DRAINING 0x2
   76 #define SY_THR_ABSENT   0x4
   77 #define SY_THR_INCR     0x8
   78 
   79 struct image_params;
   80 struct __sigset;
   81 struct syscall_args;
   82 struct trapframe;
   83 struct vnode;
   84 
   85 struct sysentvec {
   86         int             sv_size;        /* number of entries */
   87         struct sysent   *sv_table;      /* pointer to sysent */
   88         u_int           sv_mask;        /* optional mask to index */
   89         int             sv_sigsize;     /* size of signal translation table */
   90         int             *sv_sigtbl;     /* signal translation table */
   91         int             sv_errsize;     /* size of errno translation table */
   92         int             *sv_errtbl;     /* errno translation table */
   93         int             (*sv_transtrap)(int, int);
   94                                         /* translate trap-to-signal mapping */
   95         int             (*sv_fixup)(register_t **, struct image_params *);
   96                                         /* stack fixup function */
   97         void            (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
   98                                         /* send signal */
   99         char            *sv_sigcode;    /* start of sigtramp code */
  100         int             *sv_szsigcode;  /* size of sigtramp code */
  101         void            (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
  102                             caddr_t *);
  103         char            *sv_name;       /* name of binary type */
  104         int             (*sv_coredump)(struct thread *, struct vnode *, off_t, int);
  105                                         /* function to dump core, or NULL */
  106         int             (*sv_imgact_try)(struct image_params *);
  107         int             sv_minsigstksz; /* minimum signal stack size */
  108         int             sv_pagesize;    /* pagesize */
  109         vm_offset_t     sv_minuser;     /* VM_MIN_ADDRESS */
  110         vm_offset_t     sv_maxuser;     /* VM_MAXUSER_ADDRESS */
  111         vm_offset_t     sv_usrstack;    /* USRSTACK */
  112         vm_offset_t     sv_psstrings;   /* PS_STRINGS */
  113         int             sv_stackprot;   /* vm protection for stack */
  114         register_t      *(*sv_copyout_strings)(struct image_params *);
  115         void            (*sv_setregs)(struct thread *, struct image_params *,
  116                             u_long);
  117         void            (*sv_fixlimit)(struct rlimit *, int);
  118         u_long          *sv_maxssiz;
  119         u_int           sv_flags;
  120         void            (*sv_set_syscall_retval)(struct thread *, int);
  121         int             (*sv_fetch_syscall_args)(struct thread *, struct
  122                             syscall_args *);
  123         const char      **sv_syscallnames;
  124         vm_offset_t     sv_shared_page_base;
  125         vm_offset_t     sv_shared_page_len;
  126         vm_offset_t     sv_sigcode_base;
  127         vm_offset_t     sv_timekeep_base;
  128         int             sv_timekeep_off;
  129         int             sv_timekeep_curr;
  130         uint32_t        sv_timekeep_gen;
  131         void            *sv_shared_page_obj;
  132         void            (*sv_schedtail)(struct thread *);
  133 };
  134 
  135 #define SV_ILP32        0x000100
  136 #define SV_LP64         0x000200
  137 #define SV_IA32         0x004000
  138 #define SV_AOUT         0x008000
  139 #define SV_SHP          0x010000
  140 
  141 #define SV_ABI_MASK     0xff
  142 #define SV_PROC_FLAG(p, x)      ((p)->p_sysent->sv_flags & (x))
  143 #define SV_PROC_ABI(p)          ((p)->p_sysent->sv_flags & SV_ABI_MASK)
  144 #define SV_CURPROC_FLAG(x)      SV_PROC_FLAG(curproc, x)
  145 #define SV_CURPROC_ABI()        SV_PROC_ABI(curproc)
  146 /* same as ELFOSABI_XXX, to prevent header pollution */
  147 #define SV_ABI_LINUX    3
  148 #define SV_ABI_FREEBSD  9
  149 #define SV_ABI_UNDEF    255
  150 
  151 #ifdef _KERNEL
  152 extern struct sysentvec aout_sysvec;
  153 extern struct sysentvec elf_freebsd_sysvec;
  154 extern struct sysentvec null_sysvec;
  155 extern struct sysent sysent[];
  156 extern const char *syscallnames[];
  157 
  158 #if defined(__amd64__) || defined(__ia64__)
  159 extern int i386_read_exec;
  160 #endif
  161 
  162 #define NO_SYSCALL (-1)
  163 
  164 struct module;
  165 
  166 struct syscall_module_data {
  167         int     (*chainevh)(struct module *, int, void *); /* next handler */
  168         void    *chainarg;              /* arg for next event handler */
  169         int     *offset;                /* offset into sysent */
  170         struct sysent *new_sysent;      /* new sysent */
  171         struct sysent old_sysent;       /* old sysent */
  172 };
  173 
  174 #define MAKE_SYSENT(syscallname)                                \
  175 static struct sysent syscallname##_sysent = {                   \
  176         (sizeof(struct syscallname ## _args )                   \
  177             / sizeof(register_t)),                              \
  178         (sy_call_t *)& sys_##syscallname,                       \
  179         SYS_AUE_##syscallname                                   \
  180 }
  181 
  182 #define MAKE_SYSENT_COMPAT(syscallname)                         \
  183 static struct sysent syscallname##_sysent = {                   \
  184         (sizeof(struct syscallname ## _args )                   \
  185             / sizeof(register_t)),                              \
  186         (sy_call_t *)& syscallname,                             \
  187         SYS_AUE_##syscallname                                   \
  188 }
  189 
  190 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg)      \
  191 static struct syscall_module_data name##_syscall_mod = {        \
  192         evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL }     \
  193 };                                                              \
  194                                                                 \
  195 static moduledata_t name##_mod = {                              \
  196         "sys/" #name,                                           \
  197         syscall_module_handler,                                 \
  198         &name##_syscall_mod                                     \
  199 };                                                              \
  200 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
  201 
  202 #define SYSCALL_MODULE_HELPER(syscallname)                      \
  203 static int syscallname##_syscall = SYS_##syscallname;           \
  204 MAKE_SYSENT(syscallname);                                       \
  205 SYSCALL_MODULE(syscallname,                                     \
  206     & syscallname##_syscall, & syscallname##_sysent,            \
  207     NULL, NULL)
  208 
  209 #define SYSCALL_MODULE_PRESENT(syscallname)                             \
  210         (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys &&  \
  211         sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
  212 
  213 /*
  214  * Syscall registration helpers with resource allocation handling.
  215  */
  216 struct syscall_helper_data {
  217         struct sysent new_sysent;
  218         struct sysent old_sysent;
  219         int syscall_no;
  220         int registered;
  221 };
  222 #define SYSCALL_INIT_HELPER(syscallname) {                      \
  223     .new_sysent = {                                             \
  224         .sy_narg = (sizeof(struct syscallname ## _args )        \
  225             / sizeof(register_t)),                              \
  226         .sy_call = (sy_call_t *)& sys_ ## syscallname,          \
  227         .sy_auevent = SYS_AUE_##syscallname                     \
  228     },                                                          \
  229     .syscall_no = SYS_##syscallname                             \
  230 }
  231 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) {               \
  232     .new_sysent = {                                             \
  233         .sy_narg = (sizeof(struct syscallname ## _args )        \
  234             / sizeof(register_t)),                              \
  235         .sy_call = (sy_call_t *)& syscallname,                  \
  236         .sy_auevent = SYS_AUE_##syscallname                     \
  237     },                                                          \
  238     .syscall_no = SYS_##syscallname                             \
  239 }
  240 #define SYSCALL_INIT_LAST {                                     \
  241     .syscall_no = NO_SYSCALL                                    \
  242 }
  243 
  244 int     syscall_register(int *offset, struct sysent *new_sysent,
  245             struct sysent *old_sysent);
  246 int     syscall_deregister(int *offset, struct sysent *old_sysent);
  247 int     syscall_module_handler(struct module *mod, int what, void *arg);
  248 int     syscall_helper_register(struct syscall_helper_data *sd);
  249 int     syscall_helper_unregister(struct syscall_helper_data *sd);
  250 
  251 struct proc;
  252 const char *syscallname(struct proc *p, u_int code);
  253 
  254 /* Special purpose system call functions. */
  255 struct nosys_args;
  256 
  257 int     lkmnosys(struct thread *, struct nosys_args *);
  258 int     lkmressys(struct thread *, struct nosys_args *);
  259 
  260 int     syscall_thread_enter(struct thread *td, struct sysent *se);
  261 void    syscall_thread_exit(struct thread *td, struct sysent *se);
  262 
  263 int shared_page_alloc(int size, int align);
  264 int shared_page_fill(int size, int align, const void *data);
  265 void shared_page_write(int base, int size, const void *data);
  266 void exec_sysvec_init(void *param);
  267 
  268 #define INIT_SYSENTVEC(name, sv)                                        \
  269     SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY,                            \
  270         (sysinit_cfunc_t)exec_sysvec_init, sv);
  271 
  272 #endif /* _KERNEL */
  273 
  274 #endif /* !_SYS_SYSENT_H_ */

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