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. 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 struct syscall_args; 42 43 enum systrace_probe_t { 44 SYSTRACE_ENTRY, 45 SYSTRACE_RETURN, 46 }; 47 48 typedef int sy_call_t(struct thread *, void *); 49 50 typedef void (*systrace_probe_func_t)(struct syscall_args *, 51 enum systrace_probe_t, int); 52 typedef void (*systrace_args_func_t)(int, void *, uint64_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 trapframe; 88 struct vnode; 89 90 struct sysentvec { 91 int sv_size; /* number of entries */ 92 struct sysent *sv_table; /* pointer to sysent */ 93 u_int sv_mask; /* optional mask to index */ 94 int sv_errsize; /* size of errno translation table */ 95 int *sv_errtbl; /* errno translation table */ 96 int (*sv_transtrap)(int, int); 97 /* translate trap-to-signal mapping */ 98 int (*sv_fixup)(register_t **, struct image_params *); 99 /* stack fixup function */ 100 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); 101 /* send signal */ 102 char *sv_sigcode; /* start of sigtramp code */ 103 int *sv_szsigcode; /* size of sigtramp code */ 104 char *sv_name; /* name of binary type */ 105 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int); 106 /* function to dump core, or NULL */ 107 int (*sv_imgact_try)(struct image_params *); 108 int sv_minsigstksz; /* minimum signal stack size */ 109 int sv_pagesize; /* pagesize */ 110 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 111 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 112 vm_offset_t sv_usrstack; /* USRSTACK */ 113 vm_offset_t sv_psstrings; /* PS_STRINGS */ 114 int sv_stackprot; /* vm protection for stack */ 115 register_t *(*sv_copyout_strings)(struct image_params *); 116 void (*sv_setregs)(struct thread *, struct image_params *, 117 u_long); 118 void (*sv_fixlimit)(struct rlimit *, int); 119 u_long *sv_maxssiz; 120 u_int sv_flags; 121 void (*sv_set_syscall_retval)(struct thread *, int); 122 int (*sv_fetch_syscall_args)(struct thread *); 123 const char **sv_syscallnames; 124 vm_offset_t sv_timekeep_base; 125 vm_offset_t sv_shared_page_base; 126 vm_offset_t sv_shared_page_len; 127 vm_offset_t sv_sigcode_base; 128 void *sv_shared_page_obj; 129 void (*sv_schedtail)(struct thread *); 130 void (*sv_thread_detach)(struct thread *); 131 int (*sv_trap)(struct thread *); 132 }; 133 134 #define SV_ILP32 0x000100 /* 32-bit executable. */ 135 #define SV_LP64 0x000200 /* 64-bit executable. */ 136 #define SV_IA32 0x004000 /* Intel 32-bit executable. */ 137 #define SV_AOUT 0x008000 /* a.out executable. */ 138 #define SV_SHP 0x010000 /* Shared page. */ 139 #define SV_CAPSICUM 0x020000 /* Force cap_enter() on startup. */ 140 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */ 141 142 #define SV_ABI_MASK 0xff 143 #define SV_ABI_ERRNO(p, e) ((p)->p_sysent->sv_errsize <= 0 ? e : \ 144 ((e) >= (p)->p_sysent->sv_errsize ? -1 : (p)->p_sysent->sv_errtbl[e])) 145 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) 146 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) 147 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) 148 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc) 149 /* same as ELFOSABI_XXX, to prevent header pollution */ 150 #define SV_ABI_LINUX 3 151 #define SV_ABI_FREEBSD 9 152 #define SV_ABI_CLOUDABI 17 153 #define SV_ABI_UNDEF 255 154 155 #ifdef _KERNEL 156 extern struct sysentvec aout_sysvec; 157 extern struct sysent sysent[]; 158 extern const char *syscallnames[]; 159 160 #if defined(__amd64__) 161 extern int i386_read_exec; 162 #endif 163 164 #define NO_SYSCALL (-1) 165 166 struct module; 167 168 struct syscall_module_data { 169 int (*chainevh)(struct module *, int, void *); /* next handler */ 170 void *chainarg; /* arg for next event handler */ 171 int *offset; /* offset into sysent */ 172 struct sysent *new_sysent; /* new sysent */ 173 struct sysent old_sysent; /* old sysent */ 174 int flags; /* flags for syscall_register */ 175 }; 176 177 /* separate initialization vector so it can be used in a substructure */ 178 #define SYSENT_INIT_VALS(_syscallname) { \ 179 .sy_narg = (sizeof(struct _syscallname ## _args ) \ 180 / sizeof(register_t)), \ 181 .sy_call = (sy_call_t *)&sys_##_syscallname, \ 182 .sy_auevent = SYS_AUE_##_syscallname, \ 183 .sy_systrace_args_func = NULL, \ 184 .sy_entry = 0, \ 185 .sy_return = 0, \ 186 .sy_flags = 0, \ 187 .sy_thrcnt = 0 \ 188 } 189 190 #define MAKE_SYSENT(syscallname) \ 191 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname); 192 193 #define MAKE_SYSENT_COMPAT(syscallname) \ 194 static struct sysent syscallname##_sysent = { \ 195 (sizeof(struct syscallname ## _args ) \ 196 / sizeof(register_t)), \ 197 (sy_call_t *)& syscallname, \ 198 SYS_AUE_##syscallname \ 199 } 200 201 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 202 static struct syscall_module_data name##_syscall_mod = { \ 203 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 204 }; \ 205 \ 206 static moduledata_t name##_mod = { \ 207 "sys/" #name, \ 208 syscall_module_handler, \ 209 &name##_syscall_mod \ 210 }; \ 211 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 212 213 #define SYSCALL_MODULE_HELPER(syscallname) \ 214 static int syscallname##_syscall = SYS_##syscallname; \ 215 MAKE_SYSENT(syscallname); \ 216 SYSCALL_MODULE(syscallname, \ 217 & syscallname##_syscall, & syscallname##_sysent, \ 218 NULL, NULL) 219 220 #define SYSCALL_MODULE_PRESENT(syscallname) \ 221 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 222 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 223 224 /* 225 * Syscall registration helpers with resource allocation handling. 226 */ 227 struct syscall_helper_data { 228 struct sysent new_sysent; 229 struct sysent old_sysent; 230 int syscall_no; 231 int registered; 232 }; 233 #define SYSCALL_INIT_HELPER(syscallname) { \ 234 .new_sysent = { \ 235 .sy_narg = (sizeof(struct syscallname ## _args ) \ 236 / sizeof(register_t)), \ 237 .sy_call = (sy_call_t *)& sys_ ## syscallname, \ 238 .sy_auevent = SYS_AUE_##syscallname \ 239 }, \ 240 .syscall_no = SYS_##syscallname \ 241 } 242 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) { \ 243 .new_sysent = { \ 244 .sy_narg = (sizeof(struct syscallname ## _args ) \ 245 / sizeof(register_t)), \ 246 .sy_call = (sy_call_t *)& syscallname, \ 247 .sy_auevent = SYS_AUE_##syscallname \ 248 }, \ 249 .syscall_no = SYS_##syscallname \ 250 } 251 #define SYSCALL_INIT_LAST { \ 252 .syscall_no = NO_SYSCALL \ 253 } 254 255 int syscall_register(int *offset, struct sysent *new_sysent, 256 struct sysent *old_sysent, int flags); 257 int syscall_deregister(int *offset, struct sysent *old_sysent); 258 int syscall_module_handler(struct module *mod, int what, void *arg); 259 int syscall_helper_register(struct syscall_helper_data *sd, int flags); 260 int syscall_helper_unregister(struct syscall_helper_data *sd); 261 262 struct proc; 263 const char *syscallname(struct proc *p, u_int code); 264 265 /* Special purpose system call functions. */ 266 struct nosys_args; 267 268 int lkmnosys(struct thread *, struct nosys_args *); 269 int lkmressys(struct thread *, struct nosys_args *); 270 271 int syscall_thread_enter(struct thread *td, struct sysent *se); 272 void syscall_thread_exit(struct thread *td, struct sysent *se); 273 274 int shared_page_alloc(int size, int align); 275 int shared_page_fill(int size, int align, const void *data); 276 void shared_page_write(int base, int size, const void *data); 277 void exec_sysvec_init(void *param); 278 void exec_inittk(void); 279 280 #define INIT_SYSENTVEC(name, sv) \ 281 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ 282 (sysinit_cfunc_t)exec_sysvec_init, sv); 283 284 #endif /* _KERNEL */ 285 286 #endif /* !_SYS_SYSENT_H_ */ 287