2 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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36 #ifndef _SYS_SYSENT_H_
37 #define _SYS_SYSENT_H_
41 typedef int sy_call_t(struct thread *, void *);
43 struct sysent { /* system call table */
44 int sy_narg; /* number of arguments */
45 sy_call_t *sy_call; /* implementing function */
48 #define SYF_ARGMASK 0x0000FFFF
49 #define SYF_MPSAFE 0x00010000
51 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */
52 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
60 int sv_size; /* number of entries */
61 struct sysent *sv_table; /* pointer to sysent */
62 u_int sv_mask; /* optional mask to index */
63 int sv_sigsize; /* size of signal translation table */
64 int *sv_sigtbl; /* signal translation table */
65 int sv_errsize; /* size of errno translation table */
66 int *sv_errtbl; /* errno translation table */
67 int (*sv_transtrap)(int, int);
68 /* translate trap-to-signal mapping */
69 int (*sv_fixup)(register_t **, struct image_params *);
70 /* stack fixup function */
71 void (*sv_sendsig)(void (*)(int), int, struct __sigset *,
72 u_long); /* send signal */
73 char *sv_sigcode; /* start of sigtramp code */
74 int *sv_szsigcode; /* size of sigtramp code */
75 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
77 char *sv_name; /* name of binary type */
78 int (*sv_coredump)(struct thread *, struct vnode *, off_t);
79 /* function to dump core, or NULL */
80 int (*sv_imgact_try)(struct image_params *);
81 int sv_minsigstksz; /* minimum signal stack size */
82 int sv_pagesize; /* pagesize */
83 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
84 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
85 vm_offset_t sv_usrstack; /* USRSTACK */
86 vm_offset_t sv_psstrings; /* PS_STRINGS */
87 int sv_stackprot; /* vm protection for stack */
88 register_t *(*sv_copyout_strings)(struct image_params *);
89 void (*sv_setregs)(struct thread *, u_long, u_long, u_long);
93 extern struct sysentvec aout_sysvec;
94 extern struct sysentvec elf_freebsd_sysvec;
95 extern struct sysentvec null_sysvec;
96 extern struct sysent sysent[];
98 #define NO_SYSCALL (-1)
102 struct syscall_module_data {
103 int (*chainevh)(struct module *, int, void *); /* next handler */
104 void *chainarg; /* arg for next event handler */
105 int *offset; /* offset into sysent */
106 struct sysent *new_sysent; /* new sysent */
107 struct sysent old_sysent; /* old sysent */
110 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
111 static struct syscall_module_data name##_syscall_mod = { \
112 evh, arg, offset, new_sysent, { 0, NULL } \
115 static moduledata_t name##_mod = { \
117 syscall_module_handler, \
118 &name##_syscall_mod \
120 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
122 #define SYSCALL_MODULE_HELPER(syscallname) \
123 static int syscallname##_syscall = SYS_##syscallname; \
124 static struct sysent syscallname##_sysent = { \
125 (sizeof(struct syscallname ## _args ) \
126 / sizeof(register_t)), \
127 (sy_call_t *)& syscallname \
129 SYSCALL_MODULE(syscallname, \
130 & syscallname##_syscall, & syscallname##_sysent, \
133 int syscall_register(int *offset, struct sysent *new_sysent,
134 struct sysent *old_sysent);
135 int syscall_deregister(int *offset, struct sysent *old_sysent);
136 int syscall_module_handler(struct module *mod, int what, void *arg);
140 #endif /* !_SYS_SYSENT_H_ */