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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $ 34 * $DragonFly: src/sys/sys/sysent.h,v 1.8 2004/07/24 20:21:35 dillon Exp $ 35 */ 36 37 #ifndef _SYS_SYSENT_H_ 38 #define _SYS_SYSENT_H_ 39 40 struct proc; 41 42 typedef int sy_call_t (void *); 43 44 struct sysent { /* system call table */ 45 int sy_narg; /* number of arguments */ 46 sy_call_t *sy_call; /* start function */ 47 sy_call_t *sy_abort; /* abort function (only if start was async) */ 48 }; 49 50 #define SYF_ARGMASK 0x0000FFFF 51 #define SYF_MPSAFE 0x00010000 52 53 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */ 54 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */ 55 56 struct image_params; 57 struct __sigset; 58 struct trapframe; 59 struct vnode; 60 61 struct sysentvec { 62 int sv_size; /* number of entries */ 63 struct sysent *sv_table; /* pointer to sysent */ 64 u_int sv_mask; /* optional mask to index, else -1 */ 65 int sv_sigsize; /* size of signal translation table */ 66 int *sv_sigtbl; /* signal translation table */ 67 int sv_errsize; /* size of errno translation table */ 68 int *sv_errtbl; /* errno translation table */ 69 int (*sv_transtrap) (int, int); 70 /* translate trap-to-signal mapping */ 71 int (*sv_fixup) (register_t **, struct image_params *); 72 /* stack fixup function */ 73 void (*sv_sendsig) (void (*)(int), int, 74 struct __sigset *, u_long); 75 /* send signal */ 76 char *sv_sigcode; /* start of sigtramp code */ 77 int *sv_szsigcode; /* size of sigtramp code */ 78 void (*sv_prepsyscall) (struct trapframe *, int *, 79 u_int *, caddr_t *); 80 char *sv_name; /* name of binary type */ 81 int (*sv_coredump) (struct proc *, struct vnode *, 82 off_t); 83 /* function to dump core, or NULL */ 84 int (*sv_imgact_try) (struct image_params *); 85 int sv_minsigstksz; /* minimum signal stack size */ 86 }; 87 88 #ifdef _KERNEL 89 extern struct sysentvec aout_sysvec; 90 extern struct sysent sysent[]; 91 92 #define NO_SYSCALL (-1) 93 94 struct module; 95 96 struct syscall_module_data { 97 int (*chainevh)(struct module *, int, void *); /* next handler */ 98 void *chainarg; /* arg for next event handler */ 99 int *offset; /* offset into sysent */ 100 struct sysent *new_sysent; /* new sysent */ 101 struct sysent old_sysent; /* old sysent */ 102 }; 103 104 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 105 static struct syscall_module_data name##_syscall_mod = { \ 106 evh, arg, offset, new_sysent, { 0, NULL } \ 107 }; \ 108 \ 109 static moduledata_t name##_mod = { \ 110 #name, \ 111 syscall_module_handler, \ 112 &name##_syscall_mod \ 113 }; \ 114 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 115 116 #define SYSCALL_MODULE_HELPER(syscallname) \ 117 static int syscallname##_syscall = SYS_##syscallname; \ 118 static struct sysent syscallname##_sysent = { \ 119 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg) - \ 120 sizeof(union usrmsg)) / sizeof(register_t)), \ 121 (sy_call_t *)& syscallname \ 122 }; \ 123 SYSCALL_MODULE(syscallname, \ 124 & syscallname##_syscall, & syscallname##_sysent, \ 125 NULL, NULL); 126 127 int syscall_register (int *offset, struct sysent *new_sysent, 128 struct sysent *old_sysent); 129 int syscall_deregister (int *offset, struct sysent *old_sysent); 130 int syscall_module_handler (struct module *mod, int what, void *arg); 131 132 #endif /* _KERNEL */ 133 134 #endif /* !_SYS_SYSENT_H_ */ 135