FreeBSD/Linux Kernel Cross Reference
sys/sys/sysent.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD$
32 */
33
34 #ifndef _SYS_SYSENT_H_
35 #define _SYS_SYSENT_H_
36
37 #include <bsm/audit.h>
38
39 struct rlimit;
40 struct sysent;
41 struct thread;
42 struct ksiginfo;
43 struct syscall_args;
44
45 enum systrace_probe_t {
46 SYSTRACE_ENTRY,
47 SYSTRACE_RETURN,
48 };
49
50 typedef int sy_call_t(struct thread *, void *);
51
52 typedef void (*systrace_probe_func_t)(struct syscall_args *,
53 enum systrace_probe_t, int);
54 typedef void (*systrace_args_func_t)(int, void *, uint64_t *, int *);
55
56 #ifdef _KERNEL
57 extern systrace_probe_func_t systrace_probe_func;
58 extern bool systrace_enabled;
59
60 #ifdef KDTRACE_HOOKS
61 #define SYSTRACE_ENABLED() (systrace_enabled)
62 #else
63 #define SYSTRACE_ENABLED() (0)
64 #endif
65 #endif /* _KERNEL */
66
67 struct sysent { /* system call table */
68 sy_call_t *sy_call; /* implementing function */
69 systrace_args_func_t sy_systrace_args_func;
70 /* optional argument conversion function. */
71 u_int8_t sy_narg; /* number of arguments */
72 u_int8_t sy_flags; /* General flags for system calls. */
73 au_event_t sy_auevent; /* audit event associated with syscall */
74 u_int32_t sy_entry; /* DTrace entry ID for systrace. */
75 u_int32_t sy_return; /* DTrace return ID for systrace. */
76 u_int32_t sy_thrcnt;
77 };
78
79 /*
80 * A system call is permitted in capability mode.
81 */
82 #define SYF_CAPENABLED 0x00000001
83
84 #define SY_THR_FLAGMASK 0x7
85 #define SY_THR_STATIC 0x1
86 #define SY_THR_DRAINING 0x2
87 #define SY_THR_ABSENT 0x4
88 #define SY_THR_INCR 0x8
89
90 #ifdef KLD_MODULE
91 #define SY_THR_STATIC_KLD 0
92 #else
93 #define SY_THR_STATIC_KLD SY_THR_STATIC
94 #endif
95
96 struct image_params;
97 struct proc;
98 struct __sigset;
99 struct trapframe;
100 struct vnode;
101 struct note_info_list;
102
103 struct sysentvec {
104 int sv_size; /* number of entries */
105 struct sysent *sv_table; /* pointer to sysent */
106 int (*sv_fixup)(uintptr_t *, struct image_params *);
107 /* stack fixup function */
108 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
109 /* send signal */
110 const char *sv_sigcode; /* start of sigtramp code */
111 int *sv_szsigcode; /* size of sigtramp code */
112 int sv_sigcodeoff;
113 char *sv_name; /* name of binary type */
114 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int);
115 /* function to dump core, or NULL */
116 int sv_elf_core_osabi;
117 const char *sv_elf_core_abi_vendor;
118 void (*sv_elf_core_prepare_notes)(struct thread *,
119 struct note_info_list *, size_t *);
120 int (*sv_imgact_try)(struct image_params *);
121 int (*sv_copyout_auxargs)(struct image_params *,
122 uintptr_t);
123 int sv_minsigstksz; /* minimum signal stack size */
124 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
125 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
126 vm_offset_t sv_usrstack; /* USRSTACK */
127 vm_offset_t sv_psstrings; /* PS_STRINGS */
128 size_t sv_psstringssz; /* PS_STRINGS size */
129 int sv_stackprot; /* vm protection for stack */
130 int (*sv_copyout_strings)(struct image_params *,
131 uintptr_t *);
132 void (*sv_setregs)(struct thread *, struct image_params *,
133 uintptr_t);
134 void (*sv_fixlimit)(struct rlimit *, int);
135 u_long *sv_maxssiz;
136 u_int sv_flags;
137 void (*sv_set_syscall_retval)(struct thread *, int);
138 int (*sv_fetch_syscall_args)(struct thread *);
139 const char **sv_syscallnames;
140 vm_offset_t sv_timekeep_offset;
141 vm_offset_t sv_shared_page_base;
142 vm_offset_t sv_shared_page_len;
143 vm_offset_t sv_sigcode_offset;
144 void *sv_shared_page_obj;
145 vm_offset_t sv_vdso_offset;
146 void (*sv_schedtail)(struct thread *);
147 void (*sv_thread_detach)(struct thread *);
148 int (*sv_trap)(struct thread *);
149 u_long *sv_hwcap; /* Value passed in AT_HWCAP. */
150 u_long *sv_hwcap2; /* Value passed in AT_HWCAP2. */
151 const char *(*sv_machine_arch)(struct proc *);
152 vm_offset_t sv_fxrng_gen_offset;
153 void (*sv_onexec_old)(struct thread *td);
154 int (*sv_onexec)(struct proc *, struct image_params *);
155 void (*sv_onexit)(struct proc *);
156 void (*sv_ontdexit)(struct thread *td);
157 int (*sv_setid_allowed)(struct thread *td,
158 struct image_params *imgp);
159 void (*sv_set_fork_retval)(struct thread *);
160 /* Only used on x86 */
161 struct regset **sv_regset_begin;
162 struct regset **sv_regset_end;
163 };
164
165 #define SV_ILP32 0x000100 /* 32-bit executable. */
166 #define SV_LP64 0x000200 /* 64-bit executable. */
167 #define SV_IA32 0x004000 /* Intel 32-bit executable. */
168 #define SV_AOUT 0x008000 /* a.out executable. */
169 #define SV_SHP 0x010000 /* Shared page. */
170 #define SV_AVAIL1 0x020000 /* Unused */
171 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */
172 #define SV_ASLR 0x080000 /* ASLR allowed. */
173 #define SV_RNG_SEED_VER 0x100000 /* random(4) reseed generation. */
174 #define SV_SIG_DISCIGN 0x200000 /* Do not discard ignored signals */
175 #define SV_SIG_WAITNDQ 0x400000 /* Wait does not dequeue SIGCHLD */
176 #define SV_DSO_SIG 0x800000 /* Signal trampoline packed in dso */
177
178 #define SV_ABI_MASK 0xff
179 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x))
180 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK)
181 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x)
182 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc)
183 /* same as ELFOSABI_XXX, to prevent header pollution */
184 #define SV_ABI_LINUX 3
185 #define SV_ABI_FREEBSD 9
186 #define SV_ABI_UNDEF 255
187
188 /* sv_coredump flags */
189 #define SVC_PT_COREDUMP 0x00000001 /* dump requested by ptrace(2) */
190 #define SVC_NOCOMPRESS 0x00000002 /* disable compression. */
191 #define SVC_ALL 0x00000004 /* dump everything */
192
193 #ifdef _KERNEL
194 extern struct sysentvec aout_sysvec;
195 extern struct sysent sysent[];
196 extern const char *syscallnames[];
197
198 struct nosys_args {
199 register_t dummy;
200 };
201
202 int nosys(struct thread *, struct nosys_args *);
203
204 #define NO_SYSCALL (-1)
205
206 struct module;
207
208 struct syscall_module_data {
209 int (*chainevh)(struct module *, int, void *); /* next handler */
210 void *chainarg; /* arg for next event handler */
211 int *offset; /* offset into sysent */
212 struct sysent *new_sysent; /* new sysent */
213 struct sysent old_sysent; /* old sysent */
214 int flags; /* flags for syscall_register */
215 };
216
217 /* separate initialization vector so it can be used in a substructure */
218 #define SYSENT_INIT_VALS(_syscallname) { \
219 .sy_narg = (sizeof(struct _syscallname ## _args ) \
220 / sizeof(register_t)), \
221 .sy_call = (sy_call_t *)&sys_##_syscallname, \
222 .sy_auevent = SYS_AUE_##_syscallname, \
223 .sy_systrace_args_func = NULL, \
224 .sy_entry = 0, \
225 .sy_return = 0, \
226 .sy_flags = 0, \
227 .sy_thrcnt = 0 \
228 }
229
230 #define MAKE_SYSENT(syscallname) \
231 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname);
232
233 #define MAKE_SYSENT_COMPAT(syscallname) \
234 static struct sysent syscallname##_sysent = { \
235 (sizeof(struct syscallname ## _args ) \
236 / sizeof(register_t)), \
237 (sy_call_t *)& syscallname, \
238 SYS_AUE_##syscallname \
239 }
240
241 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
242 static struct syscall_module_data name##_syscall_mod = { \
243 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
244 }; \
245 \
246 static moduledata_t name##_mod = { \
247 "sys/" #name, \
248 syscall_module_handler, \
249 &name##_syscall_mod \
250 }; \
251 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
252
253 #define SYSCALL_MODULE_HELPER(syscallname) \
254 static int syscallname##_syscall = SYS_##syscallname; \
255 MAKE_SYSENT(syscallname); \
256 SYSCALL_MODULE(syscallname, \
257 & syscallname##_syscall, & syscallname##_sysent, \
258 NULL, NULL)
259
260 #define SYSCALL_MODULE_PRESENT(syscallname) \
261 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
262 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
263
264 /*
265 * Syscall registration helpers with resource allocation handling.
266 */
267 struct syscall_helper_data {
268 struct sysent new_sysent;
269 struct sysent old_sysent;
270 int syscall_no;
271 int registered;
272 };
273 #define SYSCALL_INIT_HELPER_F(syscallname, flags) { \
274 .new_sysent = { \
275 .sy_narg = (sizeof(struct syscallname ## _args ) \
276 / sizeof(register_t)), \
277 .sy_call = (sy_call_t *)& sys_ ## syscallname, \
278 .sy_auevent = SYS_AUE_##syscallname, \
279 .sy_flags = (flags) \
280 }, \
281 .syscall_no = SYS_##syscallname \
282 }
283 #define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \
284 .new_sysent = { \
285 .sy_narg = (sizeof(struct syscallname ## _args ) \
286 / sizeof(register_t)), \
287 .sy_call = (sy_call_t *)& syscallname, \
288 .sy_auevent = SYS_AUE_##syscallname, \
289 .sy_flags = (flags) \
290 }, \
291 .syscall_no = SYS_##syscallname \
292 }
293 #define SYSCALL_INIT_HELPER(syscallname) \
294 SYSCALL_INIT_HELPER_F(syscallname, 0)
295 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) \
296 SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0)
297 #define SYSCALL_INIT_LAST { \
298 .syscall_no = NO_SYSCALL \
299 }
300
301 int syscall_module_handler(struct module *mod, int what, void *arg);
302 int syscall_helper_register(struct syscall_helper_data *sd, int flags);
303 int syscall_helper_unregister(struct syscall_helper_data *sd);
304 /* Implementation, exposed for COMPAT code */
305 int kern_syscall_register(struct sysent *sysents, int *offset,
306 struct sysent *new_sysent, struct sysent *old_sysent, int flags);
307 int kern_syscall_deregister(struct sysent *sysents, int offset,
308 const struct sysent *old_sysent);
309 int kern_syscall_module_handler(struct sysent *sysents,
310 struct module *mod, int what, void *arg);
311 int kern_syscall_helper_register(struct sysent *sysents,
312 struct syscall_helper_data *sd, int flags);
313 int kern_syscall_helper_unregister(struct sysent *sysents,
314 struct syscall_helper_data *sd);
315
316 struct proc;
317 const char *syscallname(struct proc *p, u_int code);
318
319 /* Special purpose system call functions. */
320 struct nosys_args;
321
322 int lkmnosys(struct thread *, struct nosys_args *);
323 int lkmressys(struct thread *, struct nosys_args *);
324
325 int syscall_thread_enter(struct thread *td, struct sysent *se);
326 void syscall_thread_exit(struct thread *td, struct sysent *se);
327
328 int shared_page_alloc(int size, int align);
329 int shared_page_fill(int size, int align, const void *data);
330 void shared_page_write(int base, int size, const void *data);
331 void exec_sysvec_init(void *param);
332 void exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2);
333 void exec_inittk(void);
334
335 void exit_onexit(struct proc *p);
336 void exec_free_abi_mappings(struct proc *p);
337 void exec_onexec_old(struct thread *td);
338
339 #define INIT_SYSENTVEC(name, sv) \
340 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
341 (sysinit_cfunc_t)exec_sysvec_init, sv);
342
343 #endif /* _KERNEL */
344
345 #endif /* !_SYS_SYSENT_H_ */
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