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 rlimit; 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 int); 47 48 /* 49 * Used by loaded syscalls to convert arguments to a DTrace array 50 * of 64-bit arguments. 51 */ 52 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *); 53 54 extern systrace_probe_func_t systrace_probe_func; 55 56 struct sysent { /* system call table */ 57 int sy_narg; /* number of arguments */ 58 sy_call_t *sy_call; /* implementing function */ 59 au_event_t sy_auevent; /* audit event associated with syscall */ 60 systrace_args_func_t sy_systrace_args_func; 61 /* optional argument conversion function. */ 62 u_int32_t sy_entry; /* DTrace entry ID for systrace. */ 63 u_int32_t sy_return; /* DTrace return ID for systrace. */ 64 u_int32_t sy_flags; /* General flags for system calls. */ 65 u_int32_t sy_thrcnt; 66 }; 67 68 /* 69 * A system call is permitted in capability mode. 70 */ 71 #define SYF_CAPENABLED 0x00000001 72 73 #define SY_THR_FLAGMASK 0x7 74 #define SY_THR_STATIC 0x1 75 #define SY_THR_DRAINING 0x2 76 #define SY_THR_ABSENT 0x4 77 #define SY_THR_INCR 0x8 78 79 #ifdef KLD_MODULE 80 #define SY_THR_STATIC_KLD 0 81 #else 82 #define SY_THR_STATIC_KLD SY_THR_STATIC 83 #endif 84 85 struct image_params; 86 struct __sigset; 87 struct syscall_args; 88 struct trapframe; 89 struct vnode; 90 91 struct sysentvec { 92 int sv_size; /* number of entries */ 93 struct sysent *sv_table; /* pointer to sysent */ 94 u_int sv_mask; /* optional mask to index */ 95 int sv_sigsize; /* size of signal translation table */ 96 int *sv_sigtbl; /* signal translation table */ 97 int sv_errsize; /* size of errno translation table */ 98 int *sv_errtbl; /* errno translation table */ 99 int (*sv_transtrap)(int, int); 100 /* translate trap-to-signal mapping */ 101 int (*sv_fixup)(register_t **, struct image_params *); 102 /* stack fixup function */ 103 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); 104 /* send signal */ 105 char *sv_sigcode; /* start of sigtramp code */ 106 int *sv_szsigcode; /* size of sigtramp code */ 107 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *, 108 caddr_t *); 109 char *sv_name; /* name of binary type */ 110 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int); 111 /* function to dump core, or NULL */ 112 int (*sv_imgact_try)(struct image_params *); 113 int sv_minsigstksz; /* minimum signal stack size */ 114 int sv_pagesize; /* pagesize */ 115 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 116 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 117 vm_offset_t sv_usrstack; /* USRSTACK */ 118 vm_offset_t sv_psstrings; /* PS_STRINGS */ 119 int sv_stackprot; /* vm protection for stack */ 120 register_t *(*sv_copyout_strings)(struct image_params *); 121 void (*sv_setregs)(struct thread *, struct image_params *, 122 u_long); 123 void (*sv_fixlimit)(struct rlimit *, int); 124 u_long *sv_maxssiz; 125 u_int sv_flags; 126 void (*sv_set_syscall_retval)(struct thread *, int); 127 int (*sv_fetch_syscall_args)(struct thread *, struct 128 syscall_args *); 129 const char **sv_syscallnames; 130 vm_offset_t sv_shared_page_base; 131 vm_offset_t sv_shared_page_len; 132 vm_offset_t sv_sigcode_base; 133 vm_offset_t sv_timekeep_base; 134 int sv_timekeep_off; 135 int sv_timekeep_curr; 136 uint32_t sv_timekeep_gen; 137 void *sv_shared_page_obj; 138 void (*sv_schedtail)(struct thread *); 139 }; 140 141 #define SV_ILP32 0x000100 142 #define SV_LP64 0x000200 143 #define SV_IA32 0x004000 144 #define SV_AOUT 0x008000 145 #define SV_SHP 0x010000 146 147 #define SV_ABI_MASK 0xff 148 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) 149 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) 150 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) 151 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc) 152 /* same as ELFOSABI_XXX, to prevent header pollution */ 153 #define SV_ABI_LINUX 3 154 #define SV_ABI_FREEBSD 9 155 #define SV_ABI_UNDEF 255 156 157 #ifdef _KERNEL 158 extern struct sysentvec aout_sysvec; 159 extern struct sysentvec elf_freebsd_sysvec; 160 extern struct sysentvec null_sysvec; 161 extern struct sysent sysent[]; 162 extern const char *syscallnames[]; 163 164 #if defined(__amd64__) 165 extern int i386_read_exec; 166 #endif 167 168 #define NO_SYSCALL (-1) 169 170 struct module; 171 172 struct syscall_module_data { 173 int (*chainevh)(struct module *, int, void *); /* next handler */ 174 void *chainarg; /* arg for next event handler */ 175 int *offset; /* offset into sysent */ 176 struct sysent *new_sysent; /* new sysent */ 177 struct sysent old_sysent; /* old sysent */ 178 int flags; /* flags for syscall_register */ 179 }; 180 181 #define MAKE_SYSENT(syscallname) \ 182 static struct sysent syscallname##_sysent = { \ 183 (sizeof(struct syscallname ## _args ) \ 184 / sizeof(register_t)), \ 185 (sy_call_t *)& sys_##syscallname, \ 186 SYS_AUE_##syscallname \ 187 } 188 189 #define MAKE_SYSENT_COMPAT(syscallname) \ 190 static struct sysent syscallname##_sysent = { \ 191 (sizeof(struct syscallname ## _args ) \ 192 / sizeof(register_t)), \ 193 (sy_call_t *)& syscallname, \ 194 SYS_AUE_##syscallname \ 195 } 196 197 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 198 static struct syscall_module_data name##_syscall_mod = { \ 199 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 200 }; \ 201 \ 202 static moduledata_t name##_mod = { \ 203 "sys/" #name, \ 204 syscall_module_handler, \ 205 &name##_syscall_mod \ 206 }; \ 207 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 208 209 #define SYSCALL_MODULE_HELPER(syscallname) \ 210 static int syscallname##_syscall = SYS_##syscallname; \ 211 MAKE_SYSENT(syscallname); \ 212 SYSCALL_MODULE(syscallname, \ 213 & syscallname##_syscall, & syscallname##_sysent, \ 214 NULL, NULL) 215 216 #define SYSCALL_MODULE_PRESENT(syscallname) \ 217 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 218 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 219 220 /* 221 * Syscall registration helpers with resource allocation handling. 222 */ 223 struct syscall_helper_data { 224 struct sysent new_sysent; 225 struct sysent old_sysent; 226 int syscall_no; 227 int registered; 228 }; 229 #define SYSCALL_INIT_HELPER(syscallname) { \ 230 .new_sysent = { \ 231 .sy_narg = (sizeof(struct syscallname ## _args ) \ 232 / sizeof(register_t)), \ 233 .sy_call = (sy_call_t *)& sys_ ## syscallname, \ 234 .sy_auevent = SYS_AUE_##syscallname \ 235 }, \ 236 .syscall_no = SYS_##syscallname \ 237 } 238 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) { \ 239 .new_sysent = { \ 240 .sy_narg = (sizeof(struct syscallname ## _args ) \ 241 / sizeof(register_t)), \ 242 .sy_call = (sy_call_t *)& syscallname, \ 243 .sy_auevent = SYS_AUE_##syscallname \ 244 }, \ 245 .syscall_no = SYS_##syscallname \ 246 } 247 #define SYSCALL_INIT_LAST { \ 248 .syscall_no = NO_SYSCALL \ 249 } 250 251 int syscall_register(int *offset, struct sysent *new_sysent, 252 struct sysent *old_sysent, int flags); 253 int syscall_deregister(int *offset, struct sysent *old_sysent); 254 int syscall_module_handler(struct module *mod, int what, void *arg); 255 int syscall_helper_register(struct syscall_helper_data *sd, int flags); 256 int syscall_helper_unregister(struct syscall_helper_data *sd); 257 258 struct proc; 259 const char *syscallname(struct proc *p, u_int code); 260 261 /* Special purpose system call functions. */ 262 struct nosys_args; 263 264 int lkmnosys(struct thread *, struct nosys_args *); 265 int lkmressys(struct thread *, struct nosys_args *); 266 267 int syscall_thread_enter(struct thread *td, struct sysent *se); 268 void syscall_thread_exit(struct thread *td, struct sysent *se); 269 270 int shared_page_alloc(int size, int align); 271 int shared_page_fill(int size, int align, const void *data); 272 void shared_page_write(int base, int size, const void *data); 273 void exec_sysvec_init(void *param); 274 275 #define INIT_SYSENTVEC(name, sv) \ 276 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ 277 (sysinit_cfunc_t)exec_sysvec_init, sv); 278 279 #endif /* _KERNEL */ 280 281 #endif /* !_SYS_SYSENT_H_ */ 282