2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
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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
101 struct note_info_list;
104 int sv_size; /* number of entries */
105 struct sysent *sv_table; /* pointer to sysent */
106 int (*sv_transtrap)(int, int);
107 /* translate trap-to-signal mapping */
108 int (*sv_fixup)(uintptr_t *, struct image_params *);
109 /* stack fixup function */
110 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
112 char *sv_sigcode; /* start of sigtramp code */
113 int *sv_szsigcode; /* size of sigtramp code */
114 char *sv_name; /* name of binary type */
115 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int);
116 /* function to dump core, or NULL */
117 int sv_elf_core_osabi;
118 const char *sv_elf_core_abi_vendor;
119 void (*sv_elf_core_prepare_notes)(struct thread *,
120 struct note_info_list *, size_t *);
121 int (*sv_imgact_try)(struct image_params *);
122 vm_size_t (*sv_stackgap)(struct image_params *, uintptr_t *);
123 int (*sv_copyout_auxargs)(struct image_params *,
125 int sv_minsigstksz; /* minimum signal stack size */
126 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
127 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
128 vm_offset_t sv_usrstack; /* USRSTACK */
129 vm_offset_t sv_psstrings; /* PS_STRINGS */
130 int sv_stackprot; /* vm protection for stack */
131 int (*sv_copyout_strings)(struct image_params *,
133 void (*sv_setregs)(struct thread *, struct image_params *,
135 void (*sv_fixlimit)(struct rlimit *, int);
138 void (*sv_set_syscall_retval)(struct thread *, int);
139 int (*sv_fetch_syscall_args)(struct thread *);
140 const char **sv_syscallnames;
141 vm_offset_t sv_timekeep_base;
142 vm_offset_t sv_shared_page_base;
143 vm_offset_t sv_shared_page_len;
144 vm_offset_t sv_sigcode_base;
145 void *sv_shared_page_obj;
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_base;
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 */
163 #define SV_ILP32 0x000100 /* 32-bit executable. */
164 #define SV_LP64 0x000200 /* 64-bit executable. */
165 #define SV_IA32 0x004000 /* Intel 32-bit executable. */
166 #define SV_AOUT 0x008000 /* a.out executable. */
167 #define SV_SHP 0x010000 /* Shared page. */
168 #define SV_AVAIL1 0x020000 /* Unused */
169 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */
170 #define SV_ASLR 0x080000 /* ASLR allowed. */
171 #define SV_RNG_SEED_VER 0x100000 /* random(4) reseed generation. */
172 #define SV_SIG_DISCIGN 0x200000 /* Do not discard ignored signals */
173 #define SV_SIG_WAITNDQ 0x400000 /* Wait does not dequeue SIGCHLD */
175 #define SV_ABI_MASK 0xff
176 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x))
177 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK)
178 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x)
179 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc)
180 /* same as ELFOSABI_XXX, to prevent header pollution */
181 #define SV_ABI_LINUX 3
182 #define SV_ABI_FREEBSD 9
183 #define SV_ABI_UNDEF 255
185 /* sv_coredump flags */
186 #define SVC_PT_COREDUMP 0x00000001 /* dump requested by ptrace(2) */
187 #define SVC_NOCOMPRESS 0x00000002 /* disable compression. */
188 #define SVC_ALL 0x00000004 /* dump everything */
191 extern struct sysentvec aout_sysvec;
192 extern struct sysent sysent[];
193 extern const char *syscallnames[];
195 #define NO_SYSCALL (-1)
199 struct syscall_module_data {
200 int (*chainevh)(struct module *, int, void *); /* next handler */
201 void *chainarg; /* arg for next event handler */
202 int *offset; /* offset into sysent */
203 struct sysent *new_sysent; /* new sysent */
204 struct sysent old_sysent; /* old sysent */
205 int flags; /* flags for syscall_register */
208 /* separate initialization vector so it can be used in a substructure */
209 #define SYSENT_INIT_VALS(_syscallname) { \
210 .sy_narg = (sizeof(struct _syscallname ## _args ) \
211 / sizeof(register_t)), \
212 .sy_call = (sy_call_t *)&sys_##_syscallname, \
213 .sy_auevent = SYS_AUE_##_syscallname, \
214 .sy_systrace_args_func = NULL, \
221 #define MAKE_SYSENT(syscallname) \
222 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname);
224 #define MAKE_SYSENT_COMPAT(syscallname) \
225 static struct sysent syscallname##_sysent = { \
226 (sizeof(struct syscallname ## _args ) \
227 / sizeof(register_t)), \
228 (sy_call_t *)& syscallname, \
229 SYS_AUE_##syscallname \
232 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
233 static struct syscall_module_data name##_syscall_mod = { \
234 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
237 static moduledata_t name##_mod = { \
239 syscall_module_handler, \
240 &name##_syscall_mod \
242 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
244 #define SYSCALL_MODULE_HELPER(syscallname) \
245 static int syscallname##_syscall = SYS_##syscallname; \
246 MAKE_SYSENT(syscallname); \
247 SYSCALL_MODULE(syscallname, \
248 & syscallname##_syscall, & syscallname##_sysent, \
251 #define SYSCALL_MODULE_PRESENT(syscallname) \
252 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
253 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
256 * Syscall registration helpers with resource allocation handling.
258 struct syscall_helper_data {
259 struct sysent new_sysent;
260 struct sysent old_sysent;
264 #define SYSCALL_INIT_HELPER_F(syscallname, flags) { \
266 .sy_narg = (sizeof(struct syscallname ## _args ) \
267 / sizeof(register_t)), \
268 .sy_call = (sy_call_t *)& sys_ ## syscallname, \
269 .sy_auevent = SYS_AUE_##syscallname, \
270 .sy_flags = (flags) \
272 .syscall_no = SYS_##syscallname \
274 #define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \
276 .sy_narg = (sizeof(struct syscallname ## _args ) \
277 / sizeof(register_t)), \
278 .sy_call = (sy_call_t *)& syscallname, \
279 .sy_auevent = SYS_AUE_##syscallname, \
280 .sy_flags = (flags) \
282 .syscall_no = SYS_##syscallname \
284 #define SYSCALL_INIT_HELPER(syscallname) \
285 SYSCALL_INIT_HELPER_F(syscallname, 0)
286 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) \
287 SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0)
288 #define SYSCALL_INIT_LAST { \
289 .syscall_no = NO_SYSCALL \
292 int syscall_module_handler(struct module *mod, int what, void *arg);
293 int syscall_helper_register(struct syscall_helper_data *sd, int flags);
294 int syscall_helper_unregister(struct syscall_helper_data *sd);
295 /* Implementation, exposed for COMPAT code */
296 int kern_syscall_register(struct sysent *sysents, int *offset,
297 struct sysent *new_sysent, struct sysent *old_sysent, int flags);
298 int kern_syscall_deregister(struct sysent *sysents, int offset,
299 const struct sysent *old_sysent);
300 int kern_syscall_module_handler(struct sysent *sysents,
301 struct module *mod, int what, void *arg);
302 int kern_syscall_helper_register(struct sysent *sysents,
303 struct syscall_helper_data *sd, int flags);
304 int kern_syscall_helper_unregister(struct sysent *sysents,
305 struct syscall_helper_data *sd);
308 const char *syscallname(struct proc *p, u_int code);
310 /* Special purpose system call functions. */
313 int lkmnosys(struct thread *, struct nosys_args *);
314 int lkmressys(struct thread *, struct nosys_args *);
316 int syscall_thread_enter(struct thread *td, struct sysent *se);
317 void syscall_thread_exit(struct thread *td, struct sysent *se);
319 int shared_page_alloc(int size, int align);
320 int shared_page_fill(int size, int align, const void *data);
321 void shared_page_write(int base, int size, const void *data);
322 void exec_sysvec_init(void *param);
323 void exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2);
324 void exec_inittk(void);
326 void exit_onexit(struct proc *p);
327 void exec_onexec_old(struct thread *td);
329 #define INIT_SYSENTVEC(name, sv) \
330 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
331 (sysinit_cfunc_t)exec_sysvec_init, sv);
335 #endif /* !_SYS_SYSENT_H_ */