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 * $FreeBSD$ 30 */ 31 32 #ifndef _SYS_SYSENT_H_ 33 #define _SYS_SYSENT_H_ 34 35 #include <bsm/audit.h> 36 37 struct rlimit; 38 struct sysent; 39 struct thread; 40 struct ksiginfo; 41 42 typedef int sy_call_t(struct thread *, void *); 43 44 /* Used by the machine dependent syscall() code. */ 45 typedef void (*systrace_probe_func_t)(u_int32_t, int, struct sysent *, void *); 46 47 /* 48 * Used by loaded syscalls to convert arguments to a DTrace array 49 * of 64-bit arguments. 50 */ 51 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *); 52 53 extern systrace_probe_func_t systrace_probe_func; 54 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. */ 64 }; 65 66 struct image_params; 67 struct __sigset; 68 struct syscall_args; 69 struct trapframe; 70 struct vnode; 71 72 struct sysentvec { 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 *); 85 /* send signal */ 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 *, 89 caddr_t *); 90 char *sv_name; /* name of binary type */ 91 int (*sv_coredump)(struct thread *, struct vnode *, off_t, int); 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 *, struct image_params *, 103 u_long); 104 void (*sv_fixlimit)(struct rlimit *, int); 105 u_long *sv_maxssiz; 106 u_int sv_flags; 107 void (*sv_set_syscall_retval)(struct thread *, int); 108 int (*sv_fetch_syscall_args)(struct thread *, struct 109 syscall_args *); 110 const char **sv_syscallnames; 111 }; 112 113 #define SV_ILP32 0x000100 114 #define SV_LP64 0x000200 115 #define SV_IA32 0x004000 116 #define SV_AOUT 0x008000 117 118 #define SV_ABI_MASK 0xff 119 #define SV_CURPROC_FLAG(x) (curproc->p_sysent->sv_flags & (x)) 120 #define SV_CURPROC_ABI() (curproc->p_sysent->sv_flags & SV_ABI_MASK) 121 /* same as ELFOSABI_XXX, to prevent header pollution */ 122 #define SV_ABI_LINUX 3 123 #define SV_ABI_FREEBSD 9 124 #define SV_ABI_UNDEF 255 125 126 #ifdef _KERNEL 127 extern struct sysentvec aout_sysvec; 128 extern struct sysentvec elf_freebsd_sysvec; 129 extern struct sysentvec null_sysvec; 130 extern struct sysent sysent[]; 131 extern const char *syscallnames[]; 132 133 #define NO_SYSCALL (-1) 134 135 struct module; 136 137 struct syscall_module_data { 138 int (*chainevh)(struct module *, int, void *); /* next handler */ 139 void *chainarg; /* arg for next event handler */ 140 int *offset; /* offset into sysent */ 141 struct sysent *new_sysent; /* new sysent */ 142 struct sysent old_sysent; /* old sysent */ 143 }; 144 145 #define MAKE_SYSENT(syscallname) \ 146 static struct sysent syscallname##_sysent = { \ 147 (sizeof(struct syscallname ## _args ) \ 148 / sizeof(register_t)), \ 149 (sy_call_t *)& syscallname, \ 150 SYS_AUE_##syscallname \ 151 } 152 153 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ 154 static struct syscall_module_data name##_syscall_mod = { \ 155 evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ 156 }; \ 157 \ 158 static moduledata_t name##_mod = { \ 159 "sys/" #name, \ 160 syscall_module_handler, \ 161 &name##_syscall_mod \ 162 }; \ 163 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) 164 165 #define SYSCALL_MODULE_HELPER(syscallname) \ 166 static int syscallname##_syscall = SYS_##syscallname; \ 167 MAKE_SYSENT(syscallname); \ 168 SYSCALL_MODULE(syscallname, \ 169 & syscallname##_syscall, & syscallname##_sysent, \ 170 NULL, NULL) 171 172 #define SYSCALL_MODULE_PRESENT(syscallname) \ 173 (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ 174 sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) 175 176 /* 177 * Syscall registration helpers with resource allocation handling. 178 */ 179 struct syscall_helper_data { 180 struct sysent new_sysent; 181 struct sysent old_sysent; 182 int syscall_no; 183 int registered; 184 }; 185 #define SYSCALL_INIT_HELPER(syscallname) { \ 186 .new_sysent = { \ 187 .sy_narg = (sizeof(struct syscallname ## _args ) \ 188 / sizeof(register_t)), \ 189 .sy_call = (sy_call_t *)& syscallname, \ 190 .sy_auevent = SYS_AUE_##syscallname \ 191 }, \ 192 .syscall_no = SYS_##syscallname \ 193 } 194 #define SYSCALL_INIT_LAST { \ 195 .syscall_no = NO_SYSCALL \ 196 } 197 198 int syscall_register(int *offset, struct sysent *new_sysent, 199 struct sysent *old_sysent); 200 int syscall_deregister(int *offset, struct sysent *old_sysent); 201 int syscall_module_handler(struct module *mod, int what, void *arg); 202 int syscall_helper_register(struct syscall_helper_data *sd); 203 int syscall_helper_unregister(struct syscall_helper_data *sd); 204 205 struct proc; 206 const char *syscallname(struct proc *p, u_int code); 207 208 /* Special purpose system call functions. */ 209 struct nosys_args; 210 211 int lkmnosys(struct thread *, struct nosys_args *); 212 int lkmressys(struct thread *, struct nosys_args *); 213 214 #endif /* _KERNEL */ 215 216 #endif /* !_SYS_SYSENT_H_ */ 217