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
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 *);
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 *,
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 *,
117 void (*sv_fixlimit)(struct rlimit *, int);
120 void (*sv_set_syscall_retval)(struct thread *, int);
121 int (*sv_fetch_syscall_args)(struct thread *, struct
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 void *sv_shared_page_obj;
128 void (*sv_schedtail)(struct thread *);
131 #define SV_ILP32 0x000100
132 #define SV_LP64 0x000200
133 #define SV_IA32 0x004000
134 #define SV_AOUT 0x008000
135 #define SV_SHP 0x010000
137 #define SV_ABI_MASK 0xff
138 #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x))
139 #define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK)
140 #define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x)
141 #define SV_CURPROC_ABI() SV_PROC_ABI(curproc)
142 /* same as ELFOSABI_XXX, to prevent header pollution */
143 #define SV_ABI_LINUX 3
144 #define SV_ABI_FREEBSD 9
145 #define SV_ABI_UNDEF 255
148 extern struct sysentvec aout_sysvec;
149 extern struct sysentvec elf_freebsd_sysvec;
150 extern struct sysentvec null_sysvec;
151 extern struct sysent sysent[];
152 extern const char *syscallnames[];
154 #define NO_SYSCALL (-1)
158 struct syscall_module_data {
159 int (*chainevh)(struct module *, int, void *); /* next handler */
160 void *chainarg; /* arg for next event handler */
161 int *offset; /* offset into sysent */
162 struct sysent *new_sysent; /* new sysent */
163 struct sysent old_sysent; /* old sysent */
166 #define MAKE_SYSENT(syscallname) \
167 static struct sysent syscallname##_sysent = { \
168 (sizeof(struct syscallname ## _args ) \
169 / sizeof(register_t)), \
170 (sy_call_t *)& syscallname, \
171 SYS_AUE_##syscallname \
174 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
175 static struct syscall_module_data name##_syscall_mod = { \
176 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
179 static moduledata_t name##_mod = { \
181 syscall_module_handler, \
182 &name##_syscall_mod \
184 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
186 #define SYSCALL_MODULE_HELPER(syscallname) \
187 static int syscallname##_syscall = SYS_##syscallname; \
188 MAKE_SYSENT(syscallname); \
189 SYSCALL_MODULE(syscallname, \
190 & syscallname##_syscall, & syscallname##_sysent, \
193 #define SYSCALL_MODULE_PRESENT(syscallname) \
194 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
195 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
198 * Syscall registration helpers with resource allocation handling.
200 struct syscall_helper_data {
201 struct sysent new_sysent;
202 struct sysent old_sysent;
206 #define SYSCALL_INIT_HELPER(syscallname) { \
208 .sy_narg = (sizeof(struct syscallname ## _args ) \
209 / sizeof(register_t)), \
210 .sy_call = (sy_call_t *)& syscallname, \
211 .sy_auevent = SYS_AUE_##syscallname \
213 .syscall_no = SYS_##syscallname \
215 #define SYSCALL_INIT_LAST { \
216 .syscall_no = NO_SYSCALL \
219 int syscall_register(int *offset, struct sysent *new_sysent,
220 struct sysent *old_sysent);
221 int syscall_deregister(int *offset, struct sysent *old_sysent);
222 int syscall_module_handler(struct module *mod, int what, void *arg);
223 int syscall_helper_register(struct syscall_helper_data *sd);
224 int syscall_helper_unregister(struct syscall_helper_data *sd);
227 const char *syscallname(struct proc *p, u_int code);
229 /* Special purpose system call functions. */
232 int lkmnosys(struct thread *, struct nosys_args *);
233 int lkmressys(struct thread *, struct nosys_args *);
235 int syscall_thread_enter(struct thread *td, struct sysent *se);
236 void syscall_thread_exit(struct thread *td, struct sysent *se);
238 int shared_page_fill(int size, int align, const char *data);
239 void exec_sysvec_init(void *param);
241 #define INIT_SYSENTVEC(name, sv) \
242 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \
243 (sysinit_cfunc_t)exec_sysvec_init, sv);
247 #endif /* !_SYS_SYSENT_H_ */