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 * $FreeBSD$ 34 */ 35 36 #ifndef _SYS_SYSENT_H_ 37 #define _SYS_SYSENT_H_ 38 39 struct thread; 40 41 typedef int sy_call_t __P((struct thread *, void *)); 42 43 struct sysent { /* system call table */ 44 int sy_narg; /* number of arguments */ 45 sy_call_t *sy_call; /* implementing function */ 46 }; 47 48 #define SYF_ARGMASK 0x0000FFFF 49 #define SYF_MPSAFE 0x00010000 50 51 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */ 52 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */ 53 54 struct image_params; 55 struct __sigset; 56 struct trapframe; 57 struct vnode; 58 59 struct sysentvec { 60 int sv_size; /* number of entries */ 61 struct sysent *sv_table; /* pointer to sysent */ 62 u_int sv_mask; /* optional mask to index */ 63 int sv_sigsize; /* size of signal translation table */ 64 int *sv_sigtbl; /* signal translation table */ 65 int sv_errsize; /* size of errno translation table */ 66 int *sv_errtbl; /* errno translation table */ 67 int (*sv_transtrap) __P((int, int)); 68 /* translate trap-to-signal mapping */ 69 int (*sv_fixup) __P((register_t **, struct image_params *)); 70 /* stack fixup function */ 71 void (*sv_sendsig) __P((void (*)(int), int, 72 struct __sigset *, u_long)); 73 /* send signal */ 74 char *sv_sigcode; /* start of sigtramp code */ 75 int *sv_szsigcode; /* size of sigtramp code */ 76 void (*sv_prepsyscall) __P((struct trapframe *, int *, 77 u_int *, caddr_t *)); 78 char *sv_name; /* name of binary type */ 79 int (*sv_coredump) __P((struct thread *, struct vnode *, 80 off_t)); 81 /* function to dump core, or NULL */ 82 int (*sv_imgact_try) __P((struct image_params *)); 83 int sv_minsigstksz; /* minimum signal stack size */ 84 }; 85 86 #ifdef _KERNEL 87 extern struct sysentvec aout_sysvec; 88 extern struct sysentvec elf_freebsd_sysvec; 89 extern struct sysent sysent[]; 90 91 #define NO_SYSCALL (-1) 92 93 struct module; 94 95 struct syscall_module_data { 96 int (*chainevh)(struct module *, int, void *); /* next handler */ 97 void *chainarg; /* arg for next event handler */ 98 int *offset; /* offset into sysent */ 99 struct sysent *new_sysent; /* new sysent */ 100 struct sysent old_sysent; /* old sysent */ 101 }; 102 103 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 104 static struct syscall_module_data name##_syscall_mod = { \ 105 evh, arg, offset, new_sysent \ 106 }; \ 107 \ 108 static moduledata_t name##_mod = { \ 109 #name, \ 110 syscall_module_handler, \ 111 &name##_syscall_mod \ 112 }; \ 113 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 114 115 #define SYSCALL_MODULE_HELPER(syscallname, argcount) \ 116 static int syscallname##_syscall = SYS_##syscallname; \ 117 static struct sysent syscallname##_sysent = { \ 118 argcount, (sy_call_t *)& syscallname \ 119 }; \ 120 SYSCALL_MODULE(syscallname, \ 121 & syscallname##_syscall, & syscallname##_sysent, \ 122 NULL, NULL); 123 124 int syscall_register __P((int *offset, struct sysent *new_sysent, 125 struct sysent *old_sysent)); 126 int syscall_deregister __P((int *offset, struct sysent *old_sysent)); 127 int syscall_module_handler __P((struct module *mod, int what, void *arg)); 128 129 #endif /* _KERNEL */ 130 131 #endif /* !_SYS_SYSENT_H_ */ 132