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(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 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 u_int sv_mask; /* optional mask to index */ 60 int sv_sigsize; /* size of signal translation table */ 61 int *sv_sigtbl; /* signal translation table */ 62 int sv_errsize; /* size of errno translation table */ 63 int *sv_errtbl; /* errno translation table */ 64 int (*sv_transtrap)(int, int); 65 /* translate trap-to-signal mapping */ 66 int (*sv_fixup)(register_t **, struct image_params *); 67 /* stack fixup function */ 68 void (*sv_sendsig)(void (*)(int), int, struct __sigset *, 69 u_long); /* send signal */ 70 char *sv_sigcode; /* start of sigtramp code */ 71 int *sv_szsigcode; /* size of sigtramp code */ 72 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *, 73 caddr_t *); 74 char *sv_name; /* name of binary type */ 75 int (*sv_coredump)(struct thread *, struct vnode *, 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 int sv_pagesize; /* pagesize */ 80 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 81 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 82 vm_offset_t sv_usrstack; /* USRSTACK */ 83 vm_offset_t sv_psstrings; /* PS_STRINGS */ 84 int sv_stackprot; /* vm protection for stack */ 85 register_t *(*sv_copyout_strings)(struct image_params *); 86 void (*sv_setregs)(struct thread *, u_long, u_long, u_long); 87 }; 88 89 #ifdef _KERNEL 90 extern struct sysentvec aout_sysvec; 91 extern struct sysentvec elf_freebsd_sysvec; 92 extern struct sysentvec null_sysvec; 93 extern struct sysent sysent[]; 94 95 #define NO_SYSCALL (-1) 96 97 struct module; 98 99 struct syscall_module_data { 100 int (*chainevh)(struct module *, int, void *); /* next handler */ 101 void *chainarg; /* arg for next event handler */ 102 int *offset; /* offset into sysent */ 103 struct sysent *new_sysent; /* new sysent */ 104 struct sysent old_sysent; /* old sysent */ 105 }; 106 107 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 108 static struct syscall_module_data name##_syscall_mod = { \ 109 evh, arg, offset, new_sysent, { 0, NULL } \ 110 }; \ 111 \ 112 static moduledata_t name##_mod = { \ 113 #name, \ 114 syscall_module_handler, \ 115 &name##_syscall_mod \ 116 }; \ 117 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 118 119 #define SYSCALL_MODULE_HELPER(syscallname) \ 120 static int syscallname##_syscall = SYS_##syscallname; \ 121 static struct sysent syscallname##_sysent = { \ 122 (sizeof(struct syscallname ## _args ) \ 123 / sizeof(register_t)), \ 124 (sy_call_t *)& syscallname \ 125 }; \ 126 SYSCALL_MODULE(syscallname, \ 127 & syscallname##_syscall, & syscallname##_sysent, \ 128 NULL, NULL); 129 130 int syscall_register(int *offset, struct sysent *new_sysent, 131 struct sysent *old_sysent); 132 int syscall_deregister(int *offset, struct sysent *old_sysent); 133 int syscall_module_handler(struct module *mod, int what, void *arg); 134 135 #endif /* _KERNEL */ 136 137 #endif /* !_SYS_SYSENT_H_ */ 138