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 struct thread; 36 37 typedef int sy_call_t(struct thread *, void *); 38 39 struct sysent { /* system call table */ 40 int sy_narg; /* number of arguments */ 41 sy_call_t *sy_call; /* implementing function */ 42 }; 43 44 #define SYF_ARGMASK 0x0000FFFF 45 #define SYF_MPSAFE 0x00010000 46 47 struct image_params; 48 struct __sigset; 49 struct trapframe; 50 struct vnode; 51 52 struct sysentvec { 53 int sv_size; /* number of entries */ 54 struct sysent *sv_table; /* pointer to sysent */ 55 u_int sv_mask; /* optional mask to index */ 56 int sv_sigsize; /* size of signal translation table */ 57 int *sv_sigtbl; /* signal translation table */ 58 int sv_errsize; /* size of errno translation table */ 59 int *sv_errtbl; /* errno translation table */ 60 int (*sv_transtrap)(int, int); 61 /* translate trap-to-signal mapping */ 62 int (*sv_fixup)(register_t **, struct image_params *); 63 /* stack fixup function */ 64 void (*sv_sendsig)(void (*)(int), int, struct __sigset *, 65 u_long); /* send signal */ 66 char *sv_sigcode; /* start of sigtramp code */ 67 int *sv_szsigcode; /* size of sigtramp code */ 68 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *, 69 caddr_t *); 70 char *sv_name; /* name of binary type */ 71 int (*sv_coredump)(struct thread *, struct vnode *, off_t); 72 /* function to dump core, or NULL */ 73 int (*sv_imgact_try)(struct image_params *); 74 int sv_minsigstksz; /* minimum signal stack size */ 75 int sv_pagesize; /* pagesize */ 76 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 77 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 78 vm_offset_t sv_usrstack; /* USRSTACK */ 79 vm_offset_t sv_psstrings; /* PS_STRINGS */ 80 int sv_stackprot; /* vm protection for stack */ 81 register_t *(*sv_copyout_strings)(struct image_params *); 82 void (*sv_setregs)(struct thread *, u_long, u_long, u_long); 83 void (*sv_fixlimits)(struct image_params *); 84 }; 85 86 #ifdef _KERNEL 87 extern struct sysentvec aout_sysvec; 88 extern struct sysentvec elf_freebsd_sysvec; 89 extern struct sysentvec null_sysvec; 90 extern struct sysent sysent[]; 91 92 #define NO_SYSCALL (-1) 93 94 struct module; 95 96 struct syscall_module_data { 97 int (*chainevh)(struct module *, int, void *); /* next handler */ 98 void *chainarg; /* arg for next event handler */ 99 int *offset; /* offset into sysent */ 100 struct sysent *new_sysent; /* new sysent */ 101 struct sysent old_sysent; /* old sysent */ 102 }; 103 104 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 105 static struct syscall_module_data name##_syscall_mod = { \ 106 evh, arg, offset, new_sysent, { 0, NULL } \ 107 }; \ 108 \ 109 static moduledata_t name##_mod = { \ 110 #name, \ 111 syscall_module_handler, \ 112 &name##_syscall_mod \ 113 }; \ 114 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE) 115 116 #define SYSCALL_MODULE_HELPER(syscallname) \ 117 static int syscallname##_syscall = SYS_##syscallname; \ 118 static struct sysent syscallname##_sysent = { \ 119 (sizeof(struct syscallname ## _args ) \ 120 / sizeof(register_t)), \ 121 (sy_call_t *)& syscallname \ 122 }; \ 123 SYSCALL_MODULE(syscallname, \ 124 & syscallname##_syscall, & syscallname##_sysent, \ 125 NULL, NULL); 126 127 int syscall_register(int *offset, struct sysent *new_sysent, 128 struct sysent *old_sysent); 129 int syscall_deregister(int *offset, struct sysent *old_sysent); 130 int syscall_module_handler(struct module *mod, int what, void *arg); 131 132 #endif /* _KERNEL */ 133 134 #endif /* !_SYS_SYSENT_H_ */ 135