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 struct image_params; 80 struct __sigset; 81 struct syscall_args; 82 struct trapframe; 83 struct vnode; 84 85 struct sysentvec { 86 int sv_size; /* number of entries */ 87 struct sysent *sv_table; /* pointer to sysent */ 88 u_int sv_mask; /* optional mask to index */ 89 int sv_sigsize; /* size of signal translation table */ 90 int *sv_sigtbl; /* signal translation table */ 91 int sv_errsize; /* size of errno translation table */ 92 int *sv_errtbl; /* errno translation table */ 93 int (*sv_transtrap)(int, int); 94 /* translate trap-to-signal mapping */ 95 int (*sv_fixup)(register_t **, struct image_params *); 96 /* stack fixup function */ 97 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); 98 /* send signal */ 99 char *sv_sigcode; /* start of sigtramp code */ 100 int *sv_szsigcode; /* size of sigtramp code */ 101 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *, 102 caddr_t *); 103 char *sv_name; /* name of binary type */ 104 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int); 105 /* function to dump core, or NULL */ 106 int (*sv_imgact_try)(struct image_params *); 107 int sv_minsigstksz; /* minimum signal stack size */ 108 int sv_pagesize; /* pagesize */ 109 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ 110 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ 111 vm_offset_t sv_usrstack; /* USRSTACK */ 112 vm_offset_t sv_psstrings; /* PS_STRINGS */ 113 int sv_stackprot; /* vm protection for stack */ 114 register_t *(*sv_copyout_strings)(struct image_params *); 115 void (*sv_setregs)(struct thread *, struct image_params *, 116 u_long); 117 void (*sv_fixlimit)(struct rlimit *, int); 118 u_long *sv_maxssiz; 119 u_int sv_flags; 120 void (*sv_set_syscall_retval)(struct thread *, int); 121 int (*sv_fetch_syscall_args)(struct thread *, struct 122 syscall_args *); 123 const char **sv_syscallnames; 124 vm_offset_t sv_shared_page_base; 125 vm_offset_t sv_shared_page_len; 126 vm_offset_t sv_sigcode_base; 127 vm_offset_t sv_timekeep_base; 128 int sv_timekeep_off; 129 int sv_timekeep_curr; 130 uint32_t sv_timekeep_gen; 131 void *sv_shared_page_obj; 132 void (*sv_schedtail)(struct thread *); 133 }; 134 135 #define SV_ILP32 0x000100 136 #define SV_LP64 0x000200 137 #define SV_IA32 0x004000 138 #define SV_AOUT 0x008000 139 #define SV_SHP 0x010000 140 141 #define SV_ABI_MASK 0xff 142 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) 143 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) 144 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) 145 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc) 146 /* same as ELFOSABI_XXX, to prevent header pollution */ 147 #define SV_ABI_LINUX 3 148 #define SV_ABI_FREEBSD 9 149 #define SV_ABI_UNDEF 255 150 151 #ifdef _KERNEL 152 extern struct sysentvec aout_sysvec; 153 extern struct sysentvec elf_freebsd_sysvec; 154 extern struct sysentvec null_sysvec; 155 extern struct sysent sysent[]; 156 extern const char *syscallnames[]; 157 158 #if defined(__amd64__) || defined(__ia64__) 159 extern int i386_read_exec; 160 #endif 161 162 #define NO_SYSCALL (-1) 163 164 struct module; 165 166 struct syscall_module_data { 167 int (*chainevh)(struct module *, int, void *); /* next handler */ 168 void *chainarg; /* arg for next event handler */ 169 int *offset; /* offset into sysent */ 170 struct sysent *new_sysent; /* new sysent */ 171 struct sysent old_sysent; /* old sysent */ 172 }; 173 174 #define MAKE_SYSENT(syscallname) \ 175 static struct sysent syscallname##_sysent = { \ 176 (sizeof(struct syscallname ## _args ) \ 177 / sizeof(register_t)), \ 178 (sy_call_t *)& sys_##syscallname, \ 179 SYS_AUE_##syscallname \ 180 } 181 182 #define MAKE_SYSENT_COMPAT(syscallname) \ 183 static struct sysent syscallname##_sysent = { \ 184 (sizeof(struct syscallname ## _args ) \ 185 / sizeof(register_t)), \ 186 (sy_call_t *)& syscallname, \ 187 SYS_AUE_##syscallname \ 188 } 189 190 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 191 static struct syscall_module_data name##_syscall_mod = { \ 192 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 193 }; \ 194 \ 195 static moduledata_t name##_mod = { \ 196 "sys/" #name, \ 197 syscall_module_handler, \ 198 &name##_syscall_mod \ 199 }; \ 200 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 201 202 #define SYSCALL_MODULE_HELPER(syscallname) \ 203 static int syscallname##_syscall = SYS_##syscallname; \ 204 MAKE_SYSENT(syscallname); \ 205 SYSCALL_MODULE(syscallname, \ 206 & syscallname##_syscall, & syscallname##_sysent, \ 207 NULL, NULL) 208 209 #define SYSCALL_MODULE_PRESENT(syscallname) \ 210 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 211 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 212 213 /* 214 * Syscall registration helpers with resource allocation handling. 215 */ 216 struct syscall_helper_data { 217 struct sysent new_sysent; 218 struct sysent old_sysent; 219 int syscall_no; 220 int registered; 221 }; 222 #define SYSCALL_INIT_HELPER(syscallname) { \ 223 .new_sysent = { \ 224 .sy_narg = (sizeof(struct syscallname ## _args ) \ 225 / sizeof(register_t)), \ 226 .sy_call = (sy_call_t *)& sys_ ## syscallname, \ 227 .sy_auevent = SYS_AUE_##syscallname \ 228 }, \ 229 .syscall_no = SYS_##syscallname \ 230 } 231 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) { \ 232 .new_sysent = { \ 233 .sy_narg = (sizeof(struct syscallname ## _args ) \ 234 / sizeof(register_t)), \ 235 .sy_call = (sy_call_t *)& syscallname, \ 236 .sy_auevent = SYS_AUE_##syscallname \ 237 }, \ 238 .syscall_no = SYS_##syscallname \ 239 } 240 #define SYSCALL_INIT_LAST { \ 241 .syscall_no = NO_SYSCALL \ 242 } 243 244 int syscall_register(int *offset, struct sysent *new_sysent, 245 struct sysent *old_sysent); 246 int syscall_deregister(int *offset, struct sysent *old_sysent); 247 int syscall_module_handler(struct module *mod, int what, void *arg); 248 int syscall_helper_register(struct syscall_helper_data *sd); 249 int syscall_helper_unregister(struct syscall_helper_data *sd); 250 251 struct proc; 252 const char *syscallname(struct proc *p, u_int code); 253 254 /* Special purpose system call functions. */ 255 struct nosys_args; 256 257 int lkmnosys(struct thread *, struct nosys_args *); 258 int lkmressys(struct thread *, struct nosys_args *); 259 260 int syscall_thread_enter(struct thread *td, struct sysent *se); 261 void syscall_thread_exit(struct thread *td, struct sysent *se); 262 263 int shared_page_alloc(int size, int align); 264 int shared_page_fill(int size, int align, const void *data); 265 void shared_page_write(int base, int size, const void *data); 266 void exec_sysvec_init(void *param); 267 268 #define INIT_SYSENTVEC(name, sv) \ 269 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ 270 (sysinit_cfunc_t)exec_sysvec_init, sv); 271 272 #endif /* _KERNEL */ 273 274 #endif /* !_SYS_SYSENT_H_ */ 275