FreeBSD/Linux Kernel Cross Reference
sys/sys/sysent.h
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: releng/11.2/sys/sys/sysent.h 331722 2018-03-29 02:50:57Z eadler $
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 u_long *sv_hwcap; /* Value passed in AT_HWCAP. */
133 u_long *sv_hwcap2; /* Value passed in AT_HWCAP2. */
134 };
135
136 #define SV_ILP32 0x000100 /* 32-bit executable. */
137 #define SV_LP64 0x000200 /* 64-bit executable. */
138 #define SV_IA32 0x004000 /* Intel 32-bit executable. */
139 #define SV_AOUT 0x008000 /* a.out executable. */
140 #define SV_SHP 0x010000 /* Shared page. */
141 #define SV_CAPSICUM 0x020000 /* Force cap_enter() on startup. */
142 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */
143 #define SV_HWCAP 0x080000 /* sv_hwcap field is valid. */
144
145 #define SV_ABI_MASK 0xff
146 #define SV_ABI_ERRNO(p, e) ((p)->p_sysent->sv_errsize <= 0 ? e : \
147 ((e) >= (p)->p_sysent->sv_errsize ? -1 : (p)->p_sysent->sv_errtbl[e]))
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_CLOUDABI 17
156 #define SV_ABI_UNDEF 255
157
158 #ifdef _KERNEL
159 extern struct sysentvec aout_sysvec;
160 extern struct sysent sysent[];
161 extern const char *syscallnames[];
162
163 #if defined(__amd64__)
164 extern int i386_read_exec;
165 #endif
166
167 #define NO_SYSCALL (-1)
168
169 struct module;
170
171 struct syscall_module_data {
172 int (*chainevh)(struct module *, int, void *); /* next handler */
173 void *chainarg; /* arg for next event handler */
174 int *offset; /* offset into sysent */
175 struct sysent *new_sysent; /* new sysent */
176 struct sysent old_sysent; /* old sysent */
177 int flags; /* flags for syscall_register */
178 };
179
180 /* separate initialization vector so it can be used in a substructure */
181 #define SYSENT_INIT_VALS(_syscallname) { \
182 .sy_narg = (sizeof(struct _syscallname ## _args ) \
183 / sizeof(register_t)), \
184 .sy_call = (sy_call_t *)&sys_##_syscallname, \
185 .sy_auevent = SYS_AUE_##_syscallname, \
186 .sy_systrace_args_func = NULL, \
187 .sy_entry = 0, \
188 .sy_return = 0, \
189 .sy_flags = 0, \
190 .sy_thrcnt = 0 \
191 }
192
193 #define MAKE_SYSENT(syscallname) \
194 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname);
195
196 #define MAKE_SYSENT_COMPAT(syscallname) \
197 static struct sysent syscallname##_sysent = { \
198 (sizeof(struct syscallname ## _args ) \
199 / sizeof(register_t)), \
200 (sy_call_t *)& syscallname, \
201 SYS_AUE_##syscallname \
202 }
203
204 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
205 static struct syscall_module_data name##_syscall_mod = { \
206 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
207 }; \
208 \
209 static moduledata_t name##_mod = { \
210 "sys/" #name, \
211 syscall_module_handler, \
212 &name##_syscall_mod \
213 }; \
214 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
215
216 #define SYSCALL_MODULE_HELPER(syscallname) \
217 static int syscallname##_syscall = SYS_##syscallname; \
218 MAKE_SYSENT(syscallname); \
219 SYSCALL_MODULE(syscallname, \
220 & syscallname##_syscall, & syscallname##_sysent, \
221 NULL, NULL)
222
223 #define SYSCALL_MODULE_PRESENT(syscallname) \
224 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
225 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
226
227 /*
228 * Syscall registration helpers with resource allocation handling.
229 */
230 struct syscall_helper_data {
231 struct sysent new_sysent;
232 struct sysent old_sysent;
233 int syscall_no;
234 int registered;
235 };
236 #define SYSCALL_INIT_HELPER_F(syscallname, flags) { \
237 .new_sysent = { \
238 .sy_narg = (sizeof(struct syscallname ## _args ) \
239 / sizeof(register_t)), \
240 .sy_call = (sy_call_t *)& sys_ ## syscallname, \
241 .sy_auevent = SYS_AUE_##syscallname, \
242 .sy_flags = (flags) \
243 }, \
244 .syscall_no = SYS_##syscallname \
245 }
246 #define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \
247 .new_sysent = { \
248 .sy_narg = (sizeof(struct syscallname ## _args ) \
249 / sizeof(register_t)), \
250 .sy_call = (sy_call_t *)& syscallname, \
251 .sy_auevent = SYS_AUE_##syscallname, \
252 .sy_flags = (flags) \
253 }, \
254 .syscall_no = SYS_##syscallname \
255 }
256 #define SYSCALL_INIT_HELPER(syscallname) \
257 SYSCALL_INIT_HELPER_F(syscallname, 0)
258 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) \
259 SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0)
260 #define SYSCALL_INIT_LAST { \
261 .syscall_no = NO_SYSCALL \
262 }
263
264 int syscall_register(int *offset, struct sysent *new_sysent,
265 struct sysent *old_sysent, int flags);
266 int syscall_deregister(int *offset, struct sysent *old_sysent);
267 int syscall_module_handler(struct module *mod, int what, void *arg);
268 int syscall_helper_register(struct syscall_helper_data *sd, int flags);
269 int syscall_helper_unregister(struct syscall_helper_data *sd);
270
271 struct proc;
272 const char *syscallname(struct proc *p, u_int code);
273
274 /* Special purpose system call functions. */
275 struct nosys_args;
276
277 int lkmnosys(struct thread *, struct nosys_args *);
278 int lkmressys(struct thread *, struct nosys_args *);
279
280 int syscall_thread_enter(struct thread *td, struct sysent *se);
281 void syscall_thread_exit(struct thread *td, struct sysent *se);
282
283 int shared_page_alloc(int size, int align);
284 int shared_page_fill(int size, int align, const void *data);
285 void shared_page_write(int base, int size, const void *data);
286 void exec_sysvec_init(void *param);
287 void exec_inittk(void);
288
289 #define INIT_SYSENTVEC(name, sv) \
290 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
291 (sysinit_cfunc_t)exec_sysvec_init, sv);
292
293 #endif /* _KERNEL */
294
295 #endif /* !_SYS_SYSENT_H_ */
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