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 *);
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. */
63 u_int32_t sy_flags; /* General flags for system calls. */
73 int sv_size; /* number of entries */
74 struct sysent *sv_table; /* pointer to sysent */
75 u_int sv_mask; /* optional mask to index */
76 int sv_sigsize; /* size of signal translation table */
77 int *sv_sigtbl; /* signal translation table */
78 int sv_errsize; /* size of errno translation table */
79 int *sv_errtbl; /* errno translation table */
80 int (*sv_transtrap)(int, int);
81 /* translate trap-to-signal mapping */
82 int (*sv_fixup)(register_t **, struct image_params *);
83 /* stack fixup function */
84 void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
86 char *sv_sigcode; /* start of sigtramp code */
87 int *sv_szsigcode; /* size of sigtramp code */
88 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
90 char *sv_name; /* name of binary type */
91 int (*sv_coredump)(struct thread *, struct vnode *, off_t);
92 /* function to dump core, or NULL */
93 int (*sv_imgact_try)(struct image_params *);
94 int sv_minsigstksz; /* minimum signal stack size */
95 int sv_pagesize; /* pagesize */
96 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
97 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
98 vm_offset_t sv_usrstack; /* USRSTACK */
99 vm_offset_t sv_psstrings; /* PS_STRINGS */
100 int sv_stackprot; /* vm protection for stack */
101 register_t *(*sv_copyout_strings)(struct image_params *);
102 void (*sv_setregs)(struct thread *, u_long, u_long, u_long);
103 void (*sv_fixlimit)(struct rlimit *, int);
106 void (*sv_set_syscall_retval)(struct thread *, int);
107 int (*sv_fetch_syscall_args)(struct thread *, struct
109 const char **sv_syscallnames;
112 #define SV_ILP32 0x000100
113 #define SV_LP64 0x000200
114 #define SV_IA32 0x004000
115 #define SV_AOUT 0x008000
117 #define SV_ABI_MASK 0xff
118 #define SV_CURPROC_FLAG(x) (curproc->p_sysent->sv_flags & (x))
119 #define SV_CURPROC_ABI() (curproc->p_sysent->sv_flags & SV_ABI_MASK)
120 /* same as ELFOSABI_XXX, to prevent header pollution */
121 #define SV_ABI_LINUX 3
122 #define SV_ABI_FREEBSD 9
123 #define SV_ABI_UNDEF 255
126 extern struct sysentvec aout_sysvec;
127 extern struct sysentvec elf_freebsd_sysvec;
128 extern struct sysentvec null_sysvec;
129 extern struct sysent sysent[];
130 extern const char *syscallnames[];
132 #define NO_SYSCALL (-1)
136 struct syscall_module_data {
137 int (*chainevh)(struct module *, int, void *); /* next handler */
138 void *chainarg; /* arg for next event handler */
139 int *offset; /* offset into sysent */
140 struct sysent *new_sysent; /* new sysent */
141 struct sysent old_sysent; /* old sysent */
144 #define MAKE_SYSENT(syscallname) \
145 static struct sysent syscallname##_sysent = { \
146 (sizeof(struct syscallname ## _args ) \
147 / sizeof(register_t)), \
148 (sy_call_t *)& syscallname, \
149 SYS_AUE_##syscallname \
152 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
153 static struct syscall_module_data name##_syscall_mod = { \
154 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \
157 static moduledata_t name##_mod = { \
159 syscall_module_handler, \
160 &name##_syscall_mod \
162 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
164 #define SYSCALL_MODULE_HELPER(syscallname) \
165 static int syscallname##_syscall = SYS_##syscallname; \
166 MAKE_SYSENT(syscallname); \
167 SYSCALL_MODULE(syscallname, \
168 & syscallname##_syscall, & syscallname##_sysent, \
171 #define SYSCALL_MODULE_PRESENT(syscallname) \
172 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \
173 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys)
176 * Syscall registration helpers with resource allocation handling.
178 struct syscall_helper_data {
179 struct sysent new_sysent;
180 struct sysent old_sysent;
184 #define SYSCALL_INIT_HELPER(syscallname) { \
186 .sy_narg = (sizeof(struct syscallname ## _args ) \
187 / sizeof(register_t)), \
188 .sy_call = (sy_call_t *)& syscallname, \
189 .sy_auevent = SYS_AUE_##syscallname \
191 .syscall_no = SYS_##syscallname \
193 #define SYSCALL_INIT_LAST { \
194 .syscall_no = NO_SYSCALL \
197 int syscall_register(int *offset, struct sysent *new_sysent,
198 struct sysent *old_sysent);
199 int syscall_deregister(int *offset, struct sysent *old_sysent);
200 int syscall_module_handler(struct module *mod, int what, void *arg);
201 int syscall_helper_register(struct syscall_helper_data *sd);
202 int syscall_helper_unregister(struct syscall_helper_data *sd);
205 const char *syscallname(struct proc *p, u_int code);
207 /* Special purpose system call functions. */
210 int lkmnosys(struct thread *, struct nosys_args *);
211 int lkmressys(struct thread *, struct nosys_args *);
215 #endif /* !_SYS_SYSENT_H_ */