2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
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8 * modification, are permitted provided that the following conditions
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34 #ifndef _SYS_SYSENT_H_
35 #define _SYS_SYSENT_H_
37 #include <bsm/audit.h>
45 enum systrace_probe_t {
50 typedef int sy_call_t(struct thread *, void *);
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 *);
57 extern systrace_probe_func_t systrace_probe_func;
58 extern bool systrace_enabled;
61 #define SYSTRACE_ENABLED() (systrace_enabled)
63 #define SYSTRACE_ENABLED() (0)
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. */
80 * A system call is permitted in capability mode.
82 #define SYF_CAPENABLED 0x00000001
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
91 #define SY_THR_STATIC_KLD 0
93 #define SY_THR_STATIC_KLD SY_THR_STATIC
103 int sv_size; /* number of entries */
104 struct sysent *sv_table; /* pointer to sysent */
105 int (*sv_transtrap)(int, int);
106 /* translate trap-to-signal mapping */
107 int (*sv_fixup)(uintptr_t *, struct image_params *);
108 /* stack fixup function */
109 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
111 char *sv_sigcode; /* start of sigtramp code */
112 int *sv_szsigcode; /* size of sigtramp code */
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_imgact_try)(struct image_params *);
117 void (*sv_stackgap)(struct image_params *, uintptr_t *);
118 int (*sv_copyout_auxargs)(struct image_params *,
120 int sv_minsigstksz; /* minimum signal stack size */
121 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
122 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
123 vm_offset_t sv_usrstack; /* USRSTACK */
124 vm_offset_t sv_psstrings; /* PS_STRINGS */
125 int sv_stackprot; /* vm protection for stack */
126 int (*sv_copyout_strings)(struct image_params *,
128 void (*sv_setregs)(struct thread *, struct image_params *,
130 void (*sv_fixlimit)(struct rlimit *, int);
133 void (*sv_set_syscall_retval)(struct thread *, int);
134 int (*sv_fetch_syscall_args)(struct thread *);
135 const char **sv_syscallnames;
136 vm_offset_t sv_timekeep_base;
137 vm_offset_t sv_shared_page_base;
138 vm_offset_t sv_shared_page_len;
139 vm_offset_t sv_sigcode_base;
140 void *sv_shared_page_obj;
141 void (*sv_schedtail)(struct thread *);
142 void (*sv_thread_detach)(struct thread *);
143 int (*sv_trap)(struct thread *);
144 u_long *sv_hwcap; /* Value passed in AT_HWCAP. */
145 u_long *sv_hwcap2; /* Value passed in AT_HWCAP2. */
146 const char *(*sv_machine_arch)(struct proc *);
147 vm_offset_t sv_fxrng_gen_base;
148 void (*sv_onexec)(struct proc *, struct image_params *);
149 void (*sv_onexit)(struct proc *);
150 void (*sv_ontdexit)(struct thread *td);
153 #define SV_ILP32 0x000100 /* 32-bit executable. */
154 #define SV_LP64 0x000200 /* 64-bit executable. */
155 #define SV_IA32 0x004000 /* Intel 32-bit executable. */
156 #define SV_AOUT 0x008000 /* a.out executable. */
157 #define SV_SHP 0x010000 /* Shared page. */
158 #define SV_CAPSICUM 0x020000 /* Force cap_enter() on startup. */
159 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */
160 #define SV_ASLR 0x080000 /* ASLR allowed. */
161 #define SV_RNG_SEED_VER 0x100000 /* random(4) reseed generation. */
163 #define SV_ABI_MASK 0xff
164 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x))
165 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK)
166 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x)
167 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc)
168 /* same as ELFOSABI_XXX, to prevent header pollution */
169 #define SV_ABI_LINUX 3
170 #define SV_ABI_FREEBSD 9
171 #define SV_ABI_CLOUDABI 17
172 #define SV_ABI_UNDEF 255
175 extern struct sysentvec aout_sysvec;
176 extern struct sysent sysent[];
177 extern const char *syscallnames[];
179 #define NO_SYSCALL (-1)
183 struct syscall_module_data {
184 int (*chainevh)(struct module *, int, void *); /* next handler */
185 void *chainarg; /* arg for next event handler */
186 int *offset; /* offset into sysent */
187 struct sysent *new_sysent; /* new sysent */
188 struct sysent old_sysent; /* old sysent */
189 int flags; /* flags for syscall_register */
192 /* separate initialization vector so it can be used in a substructure */
193 #define SYSENT_INIT_VALS(_syscallname) { \
194 .sy_narg = (sizeof(struct _syscallname ## _args ) \
195 / sizeof(register_t)), \
196 .sy_call = (sy_call_t *)&sys_##_syscallname, \
197 .sy_auevent = SYS_AUE_##_syscallname, \
198 .sy_systrace_args_func = NULL, \
205 #define MAKE_SYSENT(syscallname) \
206 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname);
208 #define MAKE_SYSENT_COMPAT(syscallname) \
209 static struct sysent syscallname##_sysent = { \
210 (sizeof(struct syscallname ## _args ) \
211 / sizeof(register_t)), \
212 (sy_call_t *)& syscallname, \
213 SYS_AUE_##syscallname \
216 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
217 static struct syscall_module_data name##_syscall_mod = { \
218 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
221 static moduledata_t name##_mod = { \
223 syscall_module_handler, \
224 &name##_syscall_mod \
226 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
228 #define SYSCALL_MODULE_HELPER(syscallname) \
229 static int syscallname##_syscall = SYS_##syscallname; \
230 MAKE_SYSENT(syscallname); \
231 SYSCALL_MODULE(syscallname, \
232 & syscallname##_syscall, & syscallname##_sysent, \
235 #define SYSCALL_MODULE_PRESENT(syscallname) \
236 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
237 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
240 * Syscall registration helpers with resource allocation handling.
242 struct syscall_helper_data {
243 struct sysent new_sysent;
244 struct sysent old_sysent;
248 #define SYSCALL_INIT_HELPER_F(syscallname, flags) { \
250 .sy_narg = (sizeof(struct syscallname ## _args ) \
251 / sizeof(register_t)), \
252 .sy_call = (sy_call_t *)& sys_ ## syscallname, \
253 .sy_auevent = SYS_AUE_##syscallname, \
254 .sy_flags = (flags) \
256 .syscall_no = SYS_##syscallname \
258 #define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \
260 .sy_narg = (sizeof(struct syscallname ## _args ) \
261 / sizeof(register_t)), \
262 .sy_call = (sy_call_t *)& syscallname, \
263 .sy_auevent = SYS_AUE_##syscallname, \
264 .sy_flags = (flags) \
266 .syscall_no = SYS_##syscallname \
268 #define SYSCALL_INIT_HELPER(syscallname) \
269 SYSCALL_INIT_HELPER_F(syscallname, 0)
270 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) \
271 SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0)
272 #define SYSCALL_INIT_LAST { \
273 .syscall_no = NO_SYSCALL \
276 int syscall_module_handler(struct module *mod, int what, void *arg);
277 int syscall_helper_register(struct syscall_helper_data *sd, int flags);
278 int syscall_helper_unregister(struct syscall_helper_data *sd);
279 /* Implementation, exposed for COMPAT code */
280 int kern_syscall_register(struct sysent *sysents, int *offset,
281 struct sysent *new_sysent, struct sysent *old_sysent, int flags);
282 int kern_syscall_deregister(struct sysent *sysents, int offset,
283 const struct sysent *old_sysent);
284 int kern_syscall_module_handler(struct sysent *sysents,
285 struct module *mod, int what, void *arg);
286 int kern_syscall_helper_register(struct sysent *sysents,
287 struct syscall_helper_data *sd, int flags);
288 int kern_syscall_helper_unregister(struct sysent *sysents,
289 struct syscall_helper_data *sd);
292 const char *syscallname(struct proc *p, u_int code);
294 /* Special purpose system call functions. */
297 int lkmnosys(struct thread *, struct nosys_args *);
298 int lkmressys(struct thread *, struct nosys_args *);
300 int syscall_thread_enter(struct thread *td, struct sysent *se);
301 void syscall_thread_exit(struct thread *td, struct sysent *se);
303 int shared_page_alloc(int size, int align);
304 int shared_page_fill(int size, int align, const void *data);
305 void shared_page_write(int base, int size, const void *data);
306 void exec_sysvec_init(void *param);
307 void exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2);
308 void exec_inittk(void);
310 #define INIT_SYSENTVEC(name, sv) \
311 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
312 (sysinit_cfunc_t)exec_sysvec_init, sv);
316 #endif /* !_SYS_SYSENT_H_ */