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 * 4. 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 * $FreeBSD$ 30 */ 31 32 #ifndef _SYS_SYSENT_H_ 33 #define _SYS_SYSENT_H_ 34 35 #include <bsm/audit.h> 36 37 struct proc; 38 struct thread; 39 struct ksiginfo; 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 au_event_t sy_auevent; /* audit event associated with syscall */ 47 }; 48 49 #define SYF_ARGMASK 0x0000FFFF 50 #define SYF_MPSAFE 0x00010000 51 52 struct image_params; 53 struct __sigset; 54 struct trapframe; 55 struct vnode; 56 57 struct sysentvec { 58 int sv_size; /* number of entries */ 59 struct sysent *sv_table; /* pointer to sysent */ 60 u_int sv_mask; /* optional mask to index */ 61 int sv_sigsize; /* size of signal translation table */ 62 int *sv_sigtbl; /* signal translation table */ 63 int sv_errsize; /* size of errno translation table */ 64 int *sv_errtbl; /* errno translation table */ 65 int (*sv_transtrap)(int, int); 66 /* translate trap-to-signal mapping */ 67 int (*sv_fixup)(register_t **, struct image_params *); 68 /* stack fixup function */ 69 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); 70 /* send signal */ 71 char *sv_sigcode; /* start of sigtramp code */ 72 int *sv_szsigcode; /* size of sigtramp code */ 73 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *, 74 caddr_t *); 75 char *sv_name; /* name of binary type */ 76 int (*sv_coredump)(struct thread *, struct vnode *, off_t); 77 /* function to dump core, or NULL */ 78 int (*sv_imgact_try)(struct image_params *); 79 int sv_minsigstksz; /* minimum signal stack size */ 80 int sv_pagesize; /* pagesize */ 81 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 82 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 83 vm_offset_t sv_usrstack; /* USRSTACK */ 84 vm_offset_t sv_psstrings; /* PS_STRINGS */ 85 int sv_stackprot; /* vm protection for stack */ 86 register_t *(*sv_copyout_strings)(struct image_params *); 87 void (*sv_setregs)(struct thread *, u_long, u_long, u_long); 88 void (*sv_fixlimits)(struct proc *); 89 }; 90 91 #ifdef _KERNEL 92 extern struct sysentvec aout_sysvec; 93 extern struct sysentvec elf_freebsd_sysvec; 94 extern struct sysentvec null_sysvec; 95 extern struct sysent sysent[]; 96 97 #define NO_SYSCALL (-1) 98 99 struct module; 100 101 struct syscall_module_data { 102 int (*chainevh)(struct module *, int, void *); /* next handler */ 103 void *chainarg; /* arg for next event handler */ 104 int *offset; /* offset into sysent */ 105 struct sysent *new_sysent; /* new sysent */ 106 struct sysent old_sysent; /* old sysent */ 107 }; 108 109 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 110 static struct syscall_module_data name##_syscall_mod = { \ 111 evh, arg, offset, new_sysent, { 0, NULL } \ 112 }; \ 113 \ 114 static moduledata_t name##_mod = { \ 115 #name, \ 116 syscall_module_handler, \ 117 &name##_syscall_mod \ 118 }; \ 119 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 120 121 #define SYSCALL_MODULE_HELPER(syscallname) \ 122 static int syscallname##_syscall = SYS_##syscallname; \ 123 static struct sysent syscallname##_sysent = { \ 124 (sizeof(struct syscallname ## _args ) \ 125 / sizeof(register_t)), \ 126 (sy_call_t *)& syscallname \ 127 }; \ 128 SYSCALL_MODULE(syscallname, \ 129 & syscallname##_syscall, & syscallname##_sysent, \ 130 NULL, NULL); 131 132 int syscall_register(int *offset, struct sysent *new_sysent, 133 struct sysent *old_sysent); 134 int syscall_deregister(int *offset, struct sysent *old_sysent); 135 int syscall_module_handler(struct module *mod, int what, void *arg); 136 137 #endif /* _KERNEL */ 138 139 #endif /* !_SYS_SYSENT_H_ */ 140