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 sysent; 39 struct thread; 40 struct ksiginfo; 41 42 typedef int sy_call_t(struct thread *, void *); 43 44 /* Used by the machine dependent syscall() code. */ 45 typedef void (*systrace_probe_func_t)(u_int32_t, int, struct sysent *, void *); 46 47 /* 48 * Used by loaded syscalls to convert arguments to a DTrace array 49 * of 64-bit arguments. 50 */ 51 typedef void (*systrace_args_func_t)(void *, u_int64_t *, int *); 52 53 extern systrace_probe_func_t systrace_probe_func; 54 55 struct sysent { /* system call table */ 56 int sy_narg; /* number of arguments */ 57 sy_call_t *sy_call; /* implementing function */ 58 au_event_t sy_auevent; /* audit event associated with syscall */ 59 systrace_args_func_t sy_systrace_args_func; 60 /* optional argument conversion function. */ 61 u_int32_t sy_entry; /* DTrace entry ID for systrace. */ 62 u_int32_t sy_return; /* DTrace return ID for systrace. */ 63 }; 64 65 struct image_params; 66 struct __sigset; 67 struct trapframe; 68 struct vnode; 69 70 struct sysentvec { 71 int sv_size; /* number of entries */ 72 struct sysent *sv_table; /* pointer to sysent */ 73 u_int sv_mask; /* optional mask to index */ 74 int sv_sigsize; /* size of signal translation table */ 75 int *sv_sigtbl; /* signal translation table */ 76 int sv_errsize; /* size of errno translation table */ 77 int *sv_errtbl; /* errno translation table */ 78 int (*sv_transtrap)(int, int); 79 /* translate trap-to-signal mapping */ 80 int (*sv_fixup)(register_t **, struct image_params *); 81 /* stack fixup function */ 82 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); 83 /* send signal */ 84 char *sv_sigcode; /* start of sigtramp code */ 85 int *sv_szsigcode; /* size of sigtramp code */ 86 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *, 87 caddr_t *); 88 char *sv_name; /* name of binary type */ 89 int (*sv_coredump)(struct thread *, struct vnode *, off_t); 90 /* function to dump core, or NULL */ 91 int (*sv_imgact_try)(struct image_params *); 92 int sv_minsigstksz; /* minimum signal stack size */ 93 int sv_pagesize; /* pagesize */ 94 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 95 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 96 vm_offset_t sv_usrstack; /* USRSTACK */ 97 vm_offset_t sv_psstrings; /* PS_STRINGS */ 98 int sv_stackprot; /* vm protection for stack */ 99 register_t *(*sv_copyout_strings)(struct image_params *); 100 void (*sv_setregs)(struct thread *, u_long, u_long, u_long); 101 void (*sv_fixlimits)(struct proc *); 102 }; 103 104 #ifdef _KERNEL 105 extern struct sysentvec aout_sysvec; 106 extern struct sysentvec elf_freebsd_sysvec; 107 extern struct sysentvec null_sysvec; 108 extern struct sysent sysent[]; 109 110 #define NO_SYSCALL (-1) 111 112 struct module; 113 114 struct syscall_module_data { 115 int (*chainevh)(struct module *, int, void *); /* next handler */ 116 void *chainarg; /* arg for next event handler */ 117 int *offset; /* offset into sysent */ 118 struct sysent *new_sysent; /* new sysent */ 119 struct sysent old_sysent; /* old sysent */ 120 }; 121 122 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 123 static struct syscall_module_data name##_syscall_mod = { \ 124 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 125 }; \ 126 \ 127 static moduledata_t name##_mod = { \ 128 #name, \ 129 syscall_module_handler, \ 130 &name##_syscall_mod \ 131 }; \ 132 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 133 134 #define SYSCALL_MODULE_HELPER(syscallname) \ 135 static int syscallname##_syscall = SYS_##syscallname; \ 136 static struct sysent syscallname##_sysent = { \ 137 (sizeof(struct syscallname ## _args ) \ 138 / sizeof(register_t)), \ 139 (sy_call_t *)& syscallname, \ 140 SYS_AUE_##syscallname \ 141 }; \ 142 SYSCALL_MODULE(syscallname, \ 143 & syscallname##_syscall, & syscallname##_sysent, \ 144 NULL, NULL); 145 146 #define SYSCALL_MODULE_PRESENT(syscallname) \ 147 (sysent[SYS_##syscallname].sy_call != \ 148 (sy_call_t *)lkmnosys && \ 149 sysent[SYS_##syscallname].sy_call != \ 150 (sy_call_t *)lkmressys) 151 152 int syscall_register(int *offset, struct sysent *new_sysent, 153 struct sysent *old_sysent); 154 int syscall_deregister(int *offset, struct sysent *old_sysent); 155 int syscall_module_handler(struct module *mod, int what, void *arg); 156 157 #endif /* _KERNEL */ 158 159 #endif /* !_SYS_SYSENT_H_ */ 160