2 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
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32 #ifndef _SYS_SYSENT_H_
33 #define _SYS_SYSENT_H_
35 #include <bsm/audit.h>
42 typedef int sy_call_t(struct thread *, void *);
44 /* Used by the machine dependent syscall() code. */
45 typedef void (*systrace_probe_func_t)(u_int32_t, int, struct sysent *, void *,
49 * Used by loaded syscalls to convert arguments to a DTrace array
50 * of 64-bit arguments.
52 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *);
54 extern systrace_probe_func_t systrace_probe_func;
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. */
69 * A system call is permitted in capability mode.
71 #define SYF_CAPENABLED 0x00000001
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
80 #define SY_THR_STATIC_KLD 0
82 #define SY_THR_STATIC_KLD SY_THR_STATIC
92 int sv_size; /* number of entries */
93 struct sysent *sv_table; /* pointer to sysent */
94 u_int sv_mask; /* optional mask to index */
95 int sv_sigsize; /* size of signal translation table */
96 int *sv_sigtbl; /* signal translation table */
97 int sv_errsize; /* size of errno translation table */
98 int *sv_errtbl; /* errno translation table */
99 int (*sv_transtrap)(int, int);
100 /* translate trap-to-signal mapping */
101 int (*sv_fixup)(register_t **, struct image_params *);
102 /* stack fixup function */
103 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
105 char *sv_sigcode; /* start of sigtramp code */
106 int *sv_szsigcode; /* size of sigtramp code */
107 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
109 char *sv_name; /* name of binary type */
110 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int);
111 /* function to dump core, or NULL */
112 int (*sv_imgact_try)(struct image_params *);
113 int sv_minsigstksz; /* minimum signal stack size */
114 int sv_pagesize; /* pagesize */
115 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
116 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
117 vm_offset_t sv_usrstack; /* USRSTACK */
118 vm_offset_t sv_psstrings; /* PS_STRINGS */
119 int sv_stackprot; /* vm protection for stack */
120 register_t *(*sv_copyout_strings)(struct image_params *);
121 void (*sv_setregs)(struct thread *, struct image_params *,
123 void (*sv_fixlimit)(struct rlimit *, int);
126 void (*sv_set_syscall_retval)(struct thread *, int);
127 int (*sv_fetch_syscall_args)(struct thread *, struct
129 const char **sv_syscallnames;
130 vm_offset_t sv_shared_page_base;
131 vm_offset_t sv_shared_page_len;
132 vm_offset_t sv_sigcode_base;
133 vm_offset_t sv_timekeep_base;
135 int sv_timekeep_curr;
136 uint32_t sv_timekeep_gen;
137 void *sv_shared_page_obj;
138 void (*sv_schedtail)(struct thread *);
139 void (*sv_thread_detach)(struct thread *);
142 #define SV_ILP32 0x000100
143 #define SV_LP64 0x000200
144 #define SV_IA32 0x004000
145 #define SV_AOUT 0x008000
146 #define SV_SHP 0x010000
148 #define SV_ABI_MASK 0xff
149 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x))
150 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK)
151 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x)
152 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc)
153 /* same as ELFOSABI_XXX, to prevent header pollution */
154 #define SV_ABI_LINUX 3
155 #define SV_ABI_FREEBSD 9
156 #define SV_ABI_UNDEF 255
159 extern struct sysentvec aout_sysvec;
160 extern struct sysentvec elf_freebsd_sysvec;
161 extern struct sysentvec null_sysvec;
162 extern struct sysent sysent[];
163 extern const char *syscallnames[];
165 #if defined(__amd64__)
166 extern int i386_read_exec;
169 #define NO_SYSCALL (-1)
173 struct syscall_module_data {
174 int (*chainevh)(struct module *, int, void *); /* next handler */
175 void *chainarg; /* arg for next event handler */
176 int *offset; /* offset into sysent */
177 struct sysent *new_sysent; /* new sysent */
178 struct sysent old_sysent; /* old sysent */
179 int flags; /* flags for syscall_register */
182 #define MAKE_SYSENT(syscallname) \
183 static struct sysent syscallname##_sysent = { \
184 (sizeof(struct syscallname ## _args ) \
185 / sizeof(register_t)), \
186 (sy_call_t *)& sys_##syscallname, \
187 SYS_AUE_##syscallname \
190 #define MAKE_SYSENT_COMPAT(syscallname) \
191 static struct sysent syscallname##_sysent = { \
192 (sizeof(struct syscallname ## _args ) \
193 / sizeof(register_t)), \
194 (sy_call_t *)& syscallname, \
195 SYS_AUE_##syscallname \
198 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
199 static struct syscall_module_data name##_syscall_mod = { \
200 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
203 static moduledata_t name##_mod = { \
205 syscall_module_handler, \
206 &name##_syscall_mod \
208 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
210 #define SYSCALL_MODULE_HELPER(syscallname) \
211 static int syscallname##_syscall = SYS_##syscallname; \
212 MAKE_SYSENT(syscallname); \
213 SYSCALL_MODULE(syscallname, \
214 & syscallname##_syscall, & syscallname##_sysent, \
217 #define SYSCALL_MODULE_PRESENT(syscallname) \
218 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
219 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
222 * Syscall registration helpers with resource allocation handling.
224 struct syscall_helper_data {
225 struct sysent new_sysent;
226 struct sysent old_sysent;
230 #define SYSCALL_INIT_HELPER(syscallname) { \
232 .sy_narg = (sizeof(struct syscallname ## _args ) \
233 / sizeof(register_t)), \
234 .sy_call = (sy_call_t *)& sys_ ## syscallname, \
235 .sy_auevent = SYS_AUE_##syscallname \
237 .syscall_no = SYS_##syscallname \
239 #define SYSCALL_INIT_HELPER_COMPAT(syscallname) { \
241 .sy_narg = (sizeof(struct syscallname ## _args ) \
242 / sizeof(register_t)), \
243 .sy_call = (sy_call_t *)& syscallname, \
244 .sy_auevent = SYS_AUE_##syscallname \
246 .syscall_no = SYS_##syscallname \
248 #define SYSCALL_INIT_LAST { \
249 .syscall_no = NO_SYSCALL \
252 int syscall_register(int *offset, struct sysent *new_sysent,
253 struct sysent *old_sysent, int flags);
254 int syscall_deregister(int *offset, struct sysent *old_sysent);
255 int syscall_module_handler(struct module *mod, int what, void *arg);
256 int syscall_helper_register(struct syscall_helper_data *sd, int flags);
257 int syscall_helper_unregister(struct syscall_helper_data *sd);
260 const char *syscallname(struct proc *p, u_int code);
262 /* Special purpose system call functions. */
265 int lkmnosys(struct thread *, struct nosys_args *);
266 int lkmressys(struct thread *, struct nosys_args *);
268 int syscall_thread_enter(struct thread *td, struct sysent *se);
269 void syscall_thread_exit(struct thread *td, struct sysent *se);
271 int shared_page_alloc(int size, int align);
272 int shared_page_fill(int size, int align, const void *data);
273 void shared_page_write(int base, int size, const void *data);
274 void exec_sysvec_init(void *param);
276 #define INIT_SYSENTVEC(name, sv) \
277 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
278 (sysinit_cfunc_t)exec_sysvec_init, sv);
282 #endif /* !_SYS_SYSENT_H_ */