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 void *sv_shared_page_obj; 128 void (*sv_schedtail)(struct thread *); 129 }; 130 131 #define SV_ILP32 0x000100 132 #define SV_LP64 0x000200 133 #define SV_IA32 0x004000 134 #define SV_AOUT 0x008000 135 #define SV_SHP 0x010000 136 137 #define SV_ABI_MASK 0xff 138 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) 139 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) 140 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) 141 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc) 142 /* same as ELFOSABI_XXX, to prevent header pollution */ 143 #define SV_ABI_LINUX 3 144 #define SV_ABI_FREEBSD 9 145 #define SV_ABI_UNDEF 255 146 147 #ifdef _KERNEL 148 extern struct sysentvec aout_sysvec; 149 extern struct sysentvec elf_freebsd_sysvec; 150 extern struct sysentvec null_sysvec; 151 extern struct sysent sysent[]; 152 extern const char *syscallnames[]; 153 154 #if defined(__amd64__) || defined(__ia64__) 155 extern int i386_read_exec; 156 #endif 157 158 #define NO_SYSCALL (-1) 159 160 struct module; 161 162 struct syscall_module_data { 163 int (*chainevh)(struct module *, int, void *); /* next handler */ 164 void *chainarg; /* arg for next event handler */ 165 int *offset; /* offset into sysent */ 166 struct sysent *new_sysent; /* new sysent */ 167 struct sysent old_sysent; /* old sysent */ 168 }; 169 170 #define MAKE_SYSENT(syscallname) \ 171 static struct sysent syscallname##_sysent = { \ 172 (sizeof(struct syscallname ## _args ) \ 173 / sizeof(register_t)), \ 174 (sy_call_t *)& sys_##syscallname, \ 175 SYS_AUE_##syscallname \ 176 } 177 178 #define MAKE_SYSENT_COMPAT(syscallname) \ 179 static struct sysent syscallname##_sysent = { \ 180 (sizeof(struct syscallname ## _args ) \ 181 / sizeof(register_t)), \ 182 (sy_call_t *)& syscallname, \ 183 SYS_AUE_##syscallname \ 184 } 185 186 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 187 static struct syscall_module_data name##_syscall_mod = { \ 188 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 189 }; \ 190 \ 191 static moduledata_t name##_mod = { \ 192 "sys/" #name, \ 193 syscall_module_handler, \ 194 &name##_syscall_mod \ 195 }; \ 196 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 197 198 #define SYSCALL_MODULE_HELPER(syscallname) \ 199 static int syscallname##_syscall = SYS_##syscallname; \ 200 MAKE_SYSENT(syscallname); \ 201 SYSCALL_MODULE(syscallname, \ 202 & syscallname##_syscall, & syscallname##_sysent, \ 203 NULL, NULL) 204 205 #define SYSCALL_MODULE_PRESENT(syscallname) \ 206 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 207 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 208 209 /* 210 * Syscall registration helpers with resource allocation handling. 211 */ 212 struct syscall_helper_data { 213 struct sysent new_sysent; 214 struct sysent old_sysent; 215 int syscall_no; 216 int registered; 217 }; 218 #define SYSCALL_INIT_HELPER(syscallname) { \ 219 .new_sysent = { \ 220 .sy_narg = (sizeof(struct syscallname ## _args ) \ 221 / sizeof(register_t)), \ 222 .sy_call = (sy_call_t *)& sys_ ## syscallname, \ 223 .sy_auevent = SYS_AUE_##syscallname \ 224 }, \ 225 .syscall_no = SYS_##syscallname \ 226 } 227 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) { \ 228 .new_sysent = { \ 229 .sy_narg = (sizeof(struct syscallname ## _args ) \ 230 / sizeof(register_t)), \ 231 .sy_call = (sy_call_t *)& syscallname, \ 232 .sy_auevent = SYS_AUE_##syscallname \ 233 }, \ 234 .syscall_no = SYS_##syscallname \ 235 } 236 #define SYSCALL_INIT_LAST { \ 237 .syscall_no = NO_SYSCALL \ 238 } 239 240 int syscall_register(int *offset, struct sysent *new_sysent, 241 struct sysent *old_sysent); 242 int syscall_deregister(int *offset, struct sysent *old_sysent); 243 int syscall_module_handler(struct module *mod, int what, void *arg); 244 int syscall_helper_register(struct syscall_helper_data *sd); 245 int syscall_helper_unregister(struct syscall_helper_data *sd); 246 247 struct proc; 248 const char *syscallname(struct proc *p, u_int code); 249 250 /* Special purpose system call functions. */ 251 struct nosys_args; 252 253 int lkmnosys(struct thread *, struct nosys_args *); 254 int lkmressys(struct thread *, struct nosys_args *); 255 256 int syscall_thread_enter(struct thread *td, struct sysent *se); 257 void syscall_thread_exit(struct thread *td, struct sysent *se); 258 259 int shared_page_fill(int size, int align, const char *data); 260 void exec_sysvec_init(void *param); 261 262 #define INIT_SYSENTVEC(name, sv) \ 263 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ 264 (sysinit_cfunc_t)exec_sysvec_init, sv); 265 266 #endif /* _KERNEL */ 267 268 #endif /* !_SYS_SYSENT_H_ */ 269