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 const char *sv_sigcode; /* start of sigtramp code */
113 int *sv_szsigcode; /* size of sigtramp code */
115 char *sv_name; /* name of binary type */
116 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int);
117 /* function to dump core, or NULL */
118 int sv_elf_core_osabi;
119 const char *sv_elf_core_abi_vendor;
120 void (*sv_elf_core_prepare_notes)(struct thread *,
121 struct note_info_list *, size_t *);
122 int (*sv_imgact_try)(struct image_params *);
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 size_t sv_psstringssz; /* PS_STRINGS size */
131 int sv_stackprot; /* vm protection for stack */
132 int (*sv_copyout_strings)(struct image_params *,
134 void (*sv_setregs)(struct thread *, struct image_params *,
136 void (*sv_fixlimit)(struct rlimit *, int);
139 void (*sv_set_syscall_retval)(struct thread *, int);
140 int (*sv_fetch_syscall_args)(struct thread *);
141 const char **sv_syscallnames;
142 vm_offset_t sv_timekeep_base;
143 vm_offset_t sv_shared_page_base;
144 vm_offset_t sv_shared_page_len;
145 vm_offset_t sv_sigcode_base;
146 void *sv_shared_page_obj;
147 vm_offset_t sv_vdso_base;
148 void (*sv_schedtail)(struct thread *);
149 void (*sv_thread_detach)(struct thread *);
150 int (*sv_trap)(struct thread *);
151 u_long *sv_hwcap; /* Value passed in AT_HWCAP. */
152 u_long *sv_hwcap2; /* Value passed in AT_HWCAP2. */
153 const char *(*sv_machine_arch)(struct proc *);
154 vm_offset_t sv_fxrng_gen_base;
155 void (*sv_onexec_old)(struct thread *td);
156 int (*sv_onexec)(struct proc *, struct image_params *);
157 void (*sv_onexit)(struct proc *);
158 void (*sv_ontdexit)(struct thread *td);
159 int (*sv_setid_allowed)(struct thread *td,
160 struct image_params *imgp);
161 void (*sv_set_fork_retval)(struct thread *);
162 /* Only used on x86 */
163 struct regset **sv_regset_begin;
164 struct regset **sv_regset_end;
167 #define SV_ILP32 0x000100 /* 32-bit executable. */
168 #define SV_LP64 0x000200 /* 64-bit executable. */
169 #define SV_IA32 0x004000 /* Intel 32-bit executable. */
170 #define SV_AOUT 0x008000 /* a.out executable. */
171 #define SV_SHP 0x010000 /* Shared page. */
172 #define SV_AVAIL1 0x020000 /* Unused */
173 #define SV_TIMEKEEP 0x040000 /* Shared page timehands. */
174 #define SV_ASLR 0x080000 /* ASLR allowed. */
175 #define SV_RNG_SEED_VER 0x100000 /* random(4) reseed generation. */
176 #define SV_SIG_DISCIGN 0x200000 /* Do not discard ignored signals */
177 #define SV_SIG_WAITNDQ 0x400000 /* Wait does not dequeue SIGCHLD */
178 #define SV_DSO_SIG 0x800000 /* Signal trampoline packed in dso */
180 #define SV_ABI_MASK 0xff
181 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x))
182 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK)
183 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x)
184 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc)
185 /* same as ELFOSABI_XXX, to prevent header pollution */
186 #define SV_ABI_LINUX 3
187 #define SV_ABI_FREEBSD 9
188 #define SV_ABI_UNDEF 255
190 /* sv_coredump flags */
191 #define SVC_PT_COREDUMP 0x00000001 /* dump requested by ptrace(2) */
192 #define SVC_NOCOMPRESS 0x00000002 /* disable compression. */
193 #define SVC_ALL 0x00000004 /* dump everything */
196 extern struct sysentvec aout_sysvec;
197 extern struct sysent sysent[];
198 extern const char *syscallnames[];
204 int nosys(struct thread *, struct nosys_args *);
206 #define NO_SYSCALL (-1)
210 struct syscall_module_data {
211 int (*chainevh)(struct module *, int, void *); /* next handler */
212 void *chainarg; /* arg for next event handler */
213 int *offset; /* offset into sysent */
214 struct sysent *new_sysent; /* new sysent */
215 struct sysent old_sysent; /* old sysent */
216 int flags; /* flags for syscall_register */
219 /* separate initialization vector so it can be used in a substructure */
220 #define SYSENT_INIT_VALS(_syscallname) { \
221 .sy_narg = (sizeof(struct _syscallname ## _args ) \
222 / sizeof(register_t)), \
223 .sy_call = (sy_call_t *)&sys_##_syscallname, \
224 .sy_auevent = SYS_AUE_##_syscallname, \
225 .sy_systrace_args_func = NULL, \
232 #define MAKE_SYSENT(syscallname) \
233 static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname);
235 #define MAKE_SYSENT_COMPAT(syscallname) \
236 static struct sysent syscallname##_sysent = { \
237 (sizeof(struct syscallname ## _args ) \
238 / sizeof(register_t)), \
239 (sy_call_t *)& syscallname, \
240 SYS_AUE_##syscallname \
243 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
244 static struct syscall_module_data name##_syscall_mod = { \
245 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
248 static moduledata_t name##_mod = { \
250 syscall_module_handler, \
251 &name##_syscall_mod \
253 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
255 #define SYSCALL_MODULE_HELPER(syscallname) \
256 static int syscallname##_syscall = SYS_##syscallname; \
257 MAKE_SYSENT(syscallname); \
258 SYSCALL_MODULE(syscallname, \
259 & syscallname##_syscall, & syscallname##_sysent, \
262 #define SYSCALL_MODULE_PRESENT(syscallname) \
263 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
264 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
267 * Syscall registration helpers with resource allocation handling.
269 struct syscall_helper_data {
270 struct sysent new_sysent;
271 struct sysent old_sysent;
275 #define SYSCALL_INIT_HELPER_F(syscallname, flags) { \
277 .sy_narg = (sizeof(struct syscallname ## _args ) \
278 / sizeof(register_t)), \
279 .sy_call = (sy_call_t *)& sys_ ## syscallname, \
280 .sy_auevent = SYS_AUE_##syscallname, \
281 .sy_flags = (flags) \
283 .syscall_no = SYS_##syscallname \
285 #define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \
287 .sy_narg = (sizeof(struct syscallname ## _args ) \
288 / sizeof(register_t)), \
289 .sy_call = (sy_call_t *)& syscallname, \
290 .sy_auevent = SYS_AUE_##syscallname, \
291 .sy_flags = (flags) \
293 .syscall_no = SYS_##syscallname \
295 #define SYSCALL_INIT_HELPER(syscallname) \
296 SYSCALL_INIT_HELPER_F(syscallname, 0)
297 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) \
298 SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0)
299 #define SYSCALL_INIT_LAST { \
300 .syscall_no = NO_SYSCALL \
303 int syscall_module_handler(struct module *mod, int what, void *arg);
304 int syscall_helper_register(struct syscall_helper_data *sd, int flags);
305 int syscall_helper_unregister(struct syscall_helper_data *sd);
306 /* Implementation, exposed for COMPAT code */
307 int kern_syscall_register(struct sysent *sysents, int *offset,
308 struct sysent *new_sysent, struct sysent *old_sysent, int flags);
309 int kern_syscall_deregister(struct sysent *sysents, int offset,
310 const struct sysent *old_sysent);
311 int kern_syscall_module_handler(struct sysent *sysents,
312 struct module *mod, int what, void *arg);
313 int kern_syscall_helper_register(struct sysent *sysents,
314 struct syscall_helper_data *sd, int flags);
315 int kern_syscall_helper_unregister(struct sysent *sysents,
316 struct syscall_helper_data *sd);
319 const char *syscallname(struct proc *p, u_int code);
321 /* Special purpose system call functions. */
324 int lkmnosys(struct thread *, struct nosys_args *);
325 int lkmressys(struct thread *, struct nosys_args *);
327 int syscall_thread_enter(struct thread *td, struct sysent *se);
328 void syscall_thread_exit(struct thread *td, struct sysent *se);
330 int shared_page_alloc(int size, int align);
331 int shared_page_fill(int size, int align, const void *data);
332 void shared_page_write(int base, int size, const void *data);
333 void exec_sysvec_init(void *param);
334 void exec_sysvec_init_secondary(struct sysentvec *sv, struct sysentvec *sv2);
335 void exec_inittk(void);
337 void exit_onexit(struct proc *p);
338 void exec_free_abi_mappings(struct proc *p);
339 void exec_onexec_old(struct thread *td);
341 #define INIT_SYSENTVEC(name, sv) \
342 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
343 (sysinit_cfunc_t)exec_sysvec_init, sv);
347 #endif /* !_SYS_SYSENT_H_ */