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. */
68 #define SY_THR_FLAGMASK 0x7
69 #define SY_THR_STATIC 0x1
70 #define SY_THR_DRAINING 0x2
71 #define SY_THR_ABSENT 0x4
72 #define SY_THR_INCR 0x8
81 int sv_size; /* number of entries */
82 struct sysent *sv_table; /* pointer to sysent */
83 u_int sv_mask; /* optional mask to index */
84 int sv_sigsize; /* size of signal translation table */
85 int *sv_sigtbl; /* signal translation table */
86 int sv_errsize; /* size of errno translation table */
87 int *sv_errtbl; /* errno translation table */
88 int (*sv_transtrap)(int, int);
89 /* translate trap-to-signal mapping */
90 int (*sv_fixup)(register_t **, struct image_params *);
91 /* stack fixup function */
92 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
94 char *sv_sigcode; /* start of sigtramp code */
95 int *sv_szsigcode; /* size of sigtramp code */
96 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
98 char *sv_name; /* name of binary type */
99 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int);
100 /* function to dump core, or NULL */
101 int (*sv_imgact_try)(struct image_params *);
102 int sv_minsigstksz; /* minimum signal stack size */
103 int sv_pagesize; /* pagesize */
104 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
105 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
106 vm_offset_t sv_usrstack; /* USRSTACK */
107 vm_offset_t sv_psstrings; /* PS_STRINGS */
108 int sv_stackprot; /* vm protection for stack */
109 register_t *(*sv_copyout_strings)(struct image_params *);
110 void (*sv_setregs)(struct thread *, struct image_params *,
112 void (*sv_fixlimit)(struct rlimit *, int);
115 void (*sv_set_syscall_retval)(struct thread *, int);
116 int (*sv_fetch_syscall_args)(struct thread *, struct
118 const char **sv_syscallnames;
121 #define SV_ILP32 0x000100
122 #define SV_LP64 0x000200
123 #define SV_IA32 0x004000
124 #define SV_AOUT 0x008000
126 #define SV_ABI_MASK 0xff
127 #define SV_CURPROC_FLAG(x) (curproc->p_sysent->sv_flags & (x))
128 #define SV_CURPROC_ABI() (curproc->p_sysent->sv_flags & SV_ABI_MASK)
129 /* same as ELFOSABI_XXX, to prevent header pollution */
130 #define SV_ABI_LINUX 3
131 #define SV_ABI_FREEBSD 9
132 #define SV_ABI_UNDEF 255
135 extern struct sysentvec aout_sysvec;
136 extern struct sysentvec elf_freebsd_sysvec;
137 extern struct sysentvec null_sysvec;
138 extern struct sysent sysent[];
139 extern const char *syscallnames[];
141 #define NO_SYSCALL (-1)
145 struct syscall_module_data {
146 int (*chainevh)(struct module *, int, void *); /* next handler */
147 void *chainarg; /* arg for next event handler */
148 int *offset; /* offset into sysent */
149 struct sysent *new_sysent; /* new sysent */
150 struct sysent old_sysent; /* old sysent */
153 #define MAKE_SYSENT(syscallname) \
154 static struct sysent syscallname##_sysent = { \
155 (sizeof(struct syscallname ## _args ) \
156 / sizeof(register_t)), \
157 (sy_call_t *)& syscallname, \
158 SYS_AUE_##syscallname \
161 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
162 static struct syscall_module_data name##_syscall_mod = { \
163 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
166 static moduledata_t name##_mod = { \
168 syscall_module_handler, \
169 &name##_syscall_mod \
171 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
173 #define SYSCALL_MODULE_HELPER(syscallname) \
174 static int syscallname##_syscall = SYS_##syscallname; \
175 MAKE_SYSENT(syscallname); \
176 SYSCALL_MODULE(syscallname, \
177 & syscallname##_syscall, & syscallname##_sysent, \
180 #define SYSCALL_MODULE_PRESENT(syscallname) \
181 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
182 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
185 * Syscall registration helpers with resource allocation handling.
187 struct syscall_helper_data {
188 struct sysent new_sysent;
189 struct sysent old_sysent;
193 #define SYSCALL_INIT_HELPER(syscallname) { \
195 .sy_narg = (sizeof(struct syscallname ## _args ) \
196 / sizeof(register_t)), \
197 .sy_call = (sy_call_t *)& syscallname, \
198 .sy_auevent = SYS_AUE_##syscallname \
200 .syscall_no = SYS_##syscallname \
202 #define SYSCALL_INIT_LAST { \
203 .syscall_no = NO_SYSCALL \
206 int syscall_register(int *offset, struct sysent *new_sysent,
207 struct sysent *old_sysent);
208 int syscall_deregister(int *offset, struct sysent *old_sysent);
209 int syscall_module_handler(struct module *mod, int what, void *arg);
210 int syscall_helper_register(struct syscall_helper_data *sd);
211 int syscall_helper_unregister(struct syscall_helper_data *sd);
214 const char *syscallname(struct proc *p, u_int code);
216 /* Special purpose system call functions. */
219 int lkmnosys(struct thread *, struct nosys_args *);
220 int lkmressys(struct thread *, struct nosys_args *);
222 int syscall_thread_enter(struct thread *td, struct sysent *se);
223 void syscall_thread_exit(struct thread *td, struct sysent *se);
227 #endif /* !_SYS_SYSENT_H_ */