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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 *);
48 * Used by loaded syscalls to convert arguments to a DTrace array
49 * of 64-bit arguments.
51 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *);
53 extern systrace_probe_func_t systrace_probe_func;
55 struct sysent { /* system call table */
56 int sy_narg; /* number of arguments */
57 sy_call_t *sy_call; /* implementing function */
58 au_event_t sy_auevent; /* audit event associated with syscall */
59 systrace_args_func_t sy_systrace_args_func;
60 /* optional argument conversion function. */
61 u_int32_t sy_entry; /* DTrace entry ID for systrace. */
62 u_int32_t sy_return; /* DTrace return ID for systrace. */
71 int sv_size; /* number of entries */
72 struct sysent *sv_table; /* pointer to sysent */
73 u_int sv_mask; /* optional mask to index */
74 int sv_sigsize; /* size of signal translation table */
75 int *sv_sigtbl; /* signal translation table */
76 int sv_errsize; /* size of errno translation table */
77 int *sv_errtbl; /* errno translation table */
78 int (*sv_transtrap)(int, int);
79 /* translate trap-to-signal mapping */
80 int (*sv_fixup)(register_t **, struct image_params *);
81 /* stack fixup function */
82 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
84 char *sv_sigcode; /* start of sigtramp code */
85 int *sv_szsigcode; /* size of sigtramp code */
86 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
88 char *sv_name; /* name of binary type */
89 int (*sv_coredump)(struct thread *, struct vnode *, off_t);
90 /* function to dump core, or NULL */
91 int (*sv_imgact_try)(struct image_params *);
92 int sv_minsigstksz; /* minimum signal stack size */
93 int sv_pagesize; /* pagesize */
94 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
95 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
96 vm_offset_t sv_usrstack; /* USRSTACK */
97 vm_offset_t sv_psstrings; /* PS_STRINGS */
98 int sv_stackprot; /* vm protection for stack */
99 register_t *(*sv_copyout_strings)(struct image_params *);
100 void (*sv_setregs)(struct thread *, u_long, u_long, u_long);
101 void (*sv_fixlimit)(struct rlimit *, int);
106 extern struct sysentvec aout_sysvec;
107 extern struct sysentvec elf_freebsd_sysvec;
108 extern struct sysentvec null_sysvec;
109 extern struct sysent sysent[];
111 #define NO_SYSCALL (-1)
115 struct syscall_module_data {
116 int (*chainevh)(struct module *, int, void *); /* next handler */
117 void *chainarg; /* arg for next event handler */
118 int *offset; /* offset into sysent */
119 struct sysent *new_sysent; /* new sysent */
120 struct sysent old_sysent; /* old sysent */
123 #define MAKE_SYSENT(syscallname) \
124 static struct sysent syscallname##_sysent = { \
125 (sizeof(struct syscallname ## _args ) \
126 / sizeof(register_t)), \
127 (sy_call_t *)& syscallname, \
128 SYS_AUE_##syscallname \
131 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
132 static struct syscall_module_data name##_syscall_mod = { \
133 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
136 static moduledata_t name##_mod = { \
138 syscall_module_handler, \
139 &name##_syscall_mod \
141 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
143 #define SYSCALL_MODULE_HELPER(syscallname) \
144 static int syscallname##_syscall = SYS_##syscallname; \
145 MAKE_SYSENT(syscallname); \
146 SYSCALL_MODULE(syscallname, \
147 & syscallname##_syscall, & syscallname##_sysent, \
150 #define SYSCALL_MODULE_PRESENT(syscallname) \
151 (sysent[SYS_##syscallname].sy_call != \
152 (sy_call_t *)lkmnosys && \
153 sysent[SYS_##syscallname].sy_call != \
154 (sy_call_t *)lkmressys)
156 int syscall_register(int *offset, struct sysent *new_sysent,
157 struct sysent *old_sysent);
158 int syscall_deregister(int *offset, struct sysent *old_sysent);
159 int syscall_module_handler(struct module *mod, int what, void *arg);
163 #endif /* !_SYS_SYSENT_H_ */