sysent.h revision 219131
1/*- 2 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/sys/sys/sysent.h 219131 2011-03-01 13:28:27Z rwatson $ 30 */ 31 32#ifndef _SYS_SYSENT_H_ 33#define _SYS_SYSENT_H_ 34 35#include <bsm/audit.h> 36 37struct rlimit; 38struct sysent; 39struct thread; 40struct ksiginfo; 41 42typedef int sy_call_t(struct thread *, void *); 43 44/* Used by the machine dependent syscall() code. */ 45typedef void (*systrace_probe_func_t)(u_int32_t, int, struct sysent *, void *, 46 int); 47 48/* 49 * Used by loaded syscalls to convert arguments to a DTrace array 50 * of 64-bit arguments. 51 */ 52typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *); 53 54extern systrace_probe_func_t systrace_probe_func; 55 56struct 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. */ 65 u_int32_t sy_thrcnt; 66}; 67 68/* 69 * A system call is permitted in capability mode. 70 */ 71#define SYF_CAPENABLED 0x00000001 72 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 78 79struct image_params; 80struct __sigset; 81struct syscall_args; 82struct trapframe; 83struct vnode; 84 85struct sysentvec { 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 *); 98 /* send signal */ 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 *, 102 caddr_t *); 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 *, 116 u_long); 117 void (*sv_fixlimit)(struct rlimit *, int); 118 u_long *sv_maxssiz; 119 u_int sv_flags; 120 void (*sv_set_syscall_retval)(struct thread *, int); 121 int (*sv_fetch_syscall_args)(struct thread *, struct 122 syscall_args *); 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}; 129 130#define SV_ILP32 0x000100 131#define SV_LP64 0x000200 132#define SV_IA32 0x004000 133#define SV_AOUT 0x008000 134#define SV_SHP 0x010000 135 136#define SV_ABI_MASK 0xff 137#define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) 138#define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) 139#define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) 140#define SV_CURPROC_ABI() SV_PROC_ABI(curproc) 141/* same as ELFOSABI_XXX, to prevent header pollution */ 142#define SV_ABI_LINUX 3 143#define SV_ABI_FREEBSD 9 144#define SV_ABI_UNDEF 255 145 146#ifdef _KERNEL 147extern struct sysentvec aout_sysvec; 148extern struct sysentvec elf_freebsd_sysvec; 149extern struct sysentvec null_sysvec; 150extern struct sysent sysent[]; 151extern const char *syscallnames[]; 152 153#define NO_SYSCALL (-1) 154 155struct module; 156 157struct syscall_module_data { 158 int (*chainevh)(struct module *, int, void *); /* next handler */ 159 void *chainarg; /* arg for next event handler */ 160 int *offset; /* offset into sysent */ 161 struct sysent *new_sysent; /* new sysent */ 162 struct sysent old_sysent; /* old sysent */ 163}; 164 165#define MAKE_SYSENT(syscallname) \ 166static struct sysent syscallname##_sysent = { \ 167 (sizeof(struct syscallname ## _args ) \ 168 / sizeof(register_t)), \ 169 (sy_call_t *)& syscallname, \ 170 SYS_AUE_##syscallname \ 171} 172 173#define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 174static struct syscall_module_data name##_syscall_mod = { \ 175 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 176}; \ 177 \ 178static moduledata_t name##_mod = { \ 179 "sys/" #name, \ 180 syscall_module_handler, \ 181 &name##_syscall_mod \ 182}; \ 183DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 184 185#define SYSCALL_MODULE_HELPER(syscallname) \ 186static int syscallname##_syscall = SYS_##syscallname; \ 187MAKE_SYSENT(syscallname); \ 188SYSCALL_MODULE(syscallname, \ 189 & syscallname##_syscall, & syscallname##_sysent, \ 190 NULL, NULL) 191 192#define SYSCALL_MODULE_PRESENT(syscallname) \ 193 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 194 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 195 196/* 197 * Syscall registration helpers with resource allocation handling. 198 */ 199struct syscall_helper_data { 200 struct sysent new_sysent; 201 struct sysent old_sysent; 202 int syscall_no; 203 int registered; 204}; 205#define SYSCALL_INIT_HELPER(syscallname) { \ 206 .new_sysent = { \ 207 .sy_narg = (sizeof(struct syscallname ## _args ) \ 208 / sizeof(register_t)), \ 209 .sy_call = (sy_call_t *)& syscallname, \ 210 .sy_auevent = SYS_AUE_##syscallname \ 211 }, \ 212 .syscall_no = SYS_##syscallname \ 213} 214#define SYSCALL_INIT_LAST { \ 215 .syscall_no = NO_SYSCALL \ 216} 217 218int syscall_register(int *offset, struct sysent *new_sysent, 219 struct sysent *old_sysent); 220int syscall_deregister(int *offset, struct sysent *old_sysent); 221int syscall_module_handler(struct module *mod, int what, void *arg); 222int syscall_helper_register(struct syscall_helper_data *sd); 223int syscall_helper_unregister(struct syscall_helper_data *sd); 224 225struct proc; 226const char *syscallname(struct proc *p, u_int code); 227 228/* Special purpose system call functions. */ 229struct nosys_args; 230 231int lkmnosys(struct thread *, struct nosys_args *); 232int lkmressys(struct thread *, struct nosys_args *); 233 234int syscall_thread_enter(struct thread *td, struct sysent *se); 235void syscall_thread_exit(struct thread *td, struct sysent *se); 236 237int shared_page_fill(int size, int align, const char *data); 238void exec_sysvec_init(void *param); 239 240#define INIT_SYSENTVEC(name, sv) \ 241 SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ 242 (sysinit_cfunc_t)exec_sysvec_init, sv); 243 244#endif /* _KERNEL */ 245 246#endif /* !_SYS_SYSENT_H_ */ 247