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/9.2/sys/sys/sysent.h 240817 2012-09-22 12:35:22Z kib $
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_ */
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