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. 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: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $ 30 */ 31 32 #ifndef _SYS_SYSENT_H_ 33 #define _SYS_SYSENT_H_ 34 35 #ifndef _SYS_TYPES_H_ 36 #include <sys/types.h> 37 #endif 38 39 struct lwp; 40 struct sysmsg; 41 42 typedef int sy_call_t (struct sysmsg *sysmsg, const void *); 43 44 struct sysent { /* system call table */ 45 int32_t sy_narg; /* number of arguments */ 46 uint32_t sy_rsize; /* sizeof(result) */ 47 sy_call_t *sy_call; /* start function */ 48 sy_call_t *sy_abort; /* abort function (only if start was async) */ 49 }; 50 51 struct image_params; 52 struct __sigset; 53 struct trapframe; 54 struct vnode; 55 56 struct sysentvec { 57 int sv_size; /* number of entries */ 58 struct sysent *sv_table; /* pointer to sysent */ 59 int sv_sigsize; /* size of signal translation table */ 60 int *sv_sigtbl; /* signal translation table */ 61 int sv_errsize; /* size of errno translation table */ 62 int *sv_errtbl; /* errno translation table */ 63 int (*sv_transtrap) (int, int); 64 /* translate trap-to-signal mapping */ 65 int (*sv_fixup) (register_t **, struct image_params *); 66 /* stack fixup function */ 67 void (*sv_sendsig) (void (*)(int), int, 68 struct __sigset *, u_long); 69 /* send signal */ 70 char *sv_sigcode; /* start of sigtramp code */ 71 int *sv_szsigcode; /* size of sigtramp code */ 72 /* prep syscall (must be MPSAFE) */ 73 char *sv_name; /* name of binary type */ 74 int (*sv_coredump) (struct lwp *, int, struct vnode *, 75 off_t); 76 /* function to dump core, or NULL */ 77 int (*sv_imgact_try) (struct image_params *); 78 int sv_minsigstksz; /* minimum signal stack size */ 79 }; 80 81 #ifdef _KERNEL 82 extern struct sysent sysent[]; 83 84 #define NO_SYSCALL (-1) 85 86 struct module; 87 88 struct syscall_module_data { 89 int (*chainevh)(struct module *, int, void *); /* next handler */ 90 void *chainarg; /* arg for next event handler */ 91 int *offset; /* offset into sysent */ 92 struct sysent *new_sysent; /* new sysent */ 93 struct sysent old_sysent; /* old sysent */ 94 }; 95 96 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 97 static struct syscall_module_data name##_syscall_mod = { \ 98 evh, arg, offset, new_sysent, { 0, NULL } \ 99 }; \ 100 \ 101 static moduledata_t name##_mod = { \ 102 #name, \ 103 syscall_module_handler, \ 104 &name##_syscall_mod \ 105 }; \ 106 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 107 108 #define SYSCALL_MODULE_HELPER(syscallname) \ 109 static int syscallname##_syscall = SYS_##syscallname; \ 110 static struct sysent syscallname##_sysent = { \ 111 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg)) \ 112 / sizeof(register_t)), \ 113 (sy_call_t *)& syscallname \ 114 }; \ 115 SYSCALL_MODULE(syscallname, \ 116 & syscallname##_syscall, & syscallname##_sysent, \ 117 NULL, NULL); 118 119 int syscall_register (int *offset, struct sysent *new_sysent, 120 struct sysent *old_sysent); 121 int syscall_deregister (int *offset, struct sysent *old_sysent); 122 int syscall_module_handler (struct module *mod, int what, void *arg); 123 124 #endif /* _KERNEL */ 125 126 #endif /* !_SYS_SYSENT_H_ */ 127