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 1.12 2007/02/21 15:45:37 corecode Exp $ 35 */ 36 37 #ifndef _SYS_SYSENT_H_ 38 #define _SYS_SYSENT_H_ 39 40 #ifndef _SYS_TYPES_H_ 41 #include <sys/types.h> 42 #endif 43 44 struct lwp; 45 46 typedef int sy_call_t (void *); 47 48 struct sysent { /* system call table */ 49 int sy_narg; /* number of arguments */ 50 sy_call_t *sy_call; /* start function */ 51 sy_call_t *sy_abort; /* abort function (only if start was async) */ 52 }; 53 54 #define SYF_ARGMASK 0x0000FFFF 55 56 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */ 57 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */ 58 59 struct image_params; 60 struct __sigset; 61 struct trapframe; 62 struct vnode; 63 64 struct sysentvec { 65 int sv_size; /* number of entries */ 66 struct sysent *sv_table; /* pointer to sysent */ 67 u_int sv_mask; /* optional mask to index, else -1 */ 68 int sv_sigsize; /* size of signal translation table */ 69 int *sv_sigtbl; /* signal translation table */ 70 int sv_errsize; /* size of errno translation table */ 71 int *sv_errtbl; /* errno translation table */ 72 int (*sv_transtrap) (int, int); 73 /* translate trap-to-signal mapping */ 74 int (*sv_fixup) (register_t **, struct image_params *); 75 /* stack fixup function */ 76 void (*sv_sendsig) (void (*)(int), int, 77 struct __sigset *, u_long); 78 /* send signal */ 79 char *sv_sigcode; /* start of sigtramp code */ 80 int *sv_szsigcode; /* size of sigtramp code */ 81 /* prep syscall (must be MPSAFE) */ 82 void (*sv_prepsyscall) (struct trapframe *, int *, 83 u_int *, caddr_t *); 84 char *sv_name; /* name of binary type */ 85 int (*sv_coredump) (struct lwp *, int, struct vnode *, 86 off_t); 87 /* function to dump core, or NULL */ 88 int (*sv_imgact_try) (struct image_params *); 89 int sv_minsigstksz; /* minimum signal stack size */ 90 }; 91 92 #ifdef _KERNEL 93 extern struct sysentvec aout_sysvec; 94 extern struct sysent sysent[]; 95 96 #define NO_SYSCALL (-1) 97 98 struct module; 99 100 struct syscall_module_data { 101 int (*chainevh)(struct module *, int, void *); /* next handler */ 102 void *chainarg; /* arg for next event handler */ 103 int *offset; /* offset into sysent */ 104 struct sysent *new_sysent; /* new sysent */ 105 struct sysent old_sysent; /* old sysent */ 106 }; 107 108 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 109 static struct syscall_module_data name##_syscall_mod = { \ 110 evh, arg, offset, new_sysent, { 0, NULL } \ 111 }; \ 112 \ 113 static moduledata_t name##_mod = { \ 114 #name, \ 115 syscall_module_handler, \ 116 &name##_syscall_mod \ 117 }; \ 118 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 119 120 #define SYSCALL_MODULE_HELPER(syscallname) \ 121 static int syscallname##_syscall = SYS_##syscallname; \ 122 static struct sysent syscallname##_sysent = { \ 123 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg)) \ 124 / sizeof(register_t)), \ 125 (sy_call_t *)& syscallname \ 126 }; \ 127 SYSCALL_MODULE(syscallname, \ 128 & syscallname##_syscall, & syscallname##_sysent, \ 129 NULL, NULL); 130 131 int syscall_register (int *offset, struct sysent *new_sysent, 132 struct sysent *old_sysent); 133 int syscall_deregister (int *offset, struct sysent *old_sysent); 134 int syscall_module_handler (struct module *mod, int what, void *arg); 135 136 #endif /* _KERNEL */ 137 138 #endif /* !_SYS_SYSENT_H_ */ 139