| 1 | /* $NetBSD: syscallvar.h,v 1.11 2015/09/24 14:34:22 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software developed for The NetBSD Foundation |
| 8 | * by Andrew Doran. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifndef _SYS_SYSCALLVAR_H_ |
| 33 | #define _SYS_SYSCALLVAR_H_ |
| 34 | |
| 35 | #ifndef _KERNEL |
| 36 | #error nothing of interest to userspace here |
| 37 | #endif |
| 38 | |
| 39 | #if defined(_KERNEL) && defined(_KERNEL_OPT) |
| 40 | #include "opt_dtrace.h" |
| 41 | #endif |
| 42 | |
| 43 | #include <sys/systm.h> |
| 44 | #include <sys/proc.h> |
| 45 | |
| 46 | extern struct emul emul_netbsd; |
| 47 | |
| 48 | struct syscall_package { |
| 49 | u_short sp_code; |
| 50 | u_short sp_flags; |
| 51 | sy_call_t *sp_call; |
| 52 | }; |
| 53 | |
| 54 | void syscall_init(void); |
| 55 | int syscall_establish(const struct emul *, const struct syscall_package *); |
| 56 | int syscall_disestablish(const struct emul *, const struct syscall_package *); |
| 57 | |
| 58 | static inline int |
| 59 | sy_call(const struct sysent *sy, struct lwp *l, const void *uap, |
| 60 | register_t *rval) |
| 61 | { |
| 62 | int error; |
| 63 | |
| 64 | l->l_sysent = sy; |
| 65 | error = (*sy->sy_call)(l, uap, rval); |
| 66 | l->l_sysent = NULL; |
| 67 | |
| 68 | return error; |
| 69 | } |
| 70 | |
| 71 | static inline int |
| 72 | sy_invoke(const struct sysent *sy, struct lwp *l, const void *uap, |
| 73 | register_t *rval, int code) |
| 74 | { |
| 75 | const bool do_trace = l->l_proc->p_trace_enabled && |
| 76 | (sy->sy_flags & SYCALL_INDIRECT) == 0; |
| 77 | int error; |
| 78 | |
| 79 | #ifdef KDTRACE_HOOKS |
| 80 | #define KDTRACE_ENTRY(a) (a) |
| 81 | #else |
| 82 | #define KDTRACE_ENTRY(a) (0) |
| 83 | #endif |
| 84 | if (__predict_true(!(do_trace || KDTRACE_ENTRY(sy->sy_entry))) |
| 85 | || (error = trace_enter(code, sy, uap)) == 0) { |
| 86 | rval[0] = 0; |
| 87 | #if !defined(__mips__) && !defined(__m68k__) |
| 88 | /* |
| 89 | * Due to the mips userland code for SYS_break needing v1 to be |
| 90 | * preserved, we can't clear this on mips. |
| 91 | */ |
| 92 | rval[1] = 0; |
| 93 | #endif |
| 94 | error = sy_call(sy, l, uap, rval); |
| 95 | } |
| 96 | |
| 97 | if (__predict_false(do_trace || KDTRACE_ENTRY(sy->sy_return))) { |
| 98 | trace_exit(code, sy, uap, rval, error); |
| 99 | } |
| 100 | return error; |
| 101 | } |
| 102 | |
| 103 | /* inclusion in the kernel currently depends on SYSCALL_DEBUG */ |
| 104 | extern const char * const syscallnames[]; |
| 105 | extern const char * const altsyscallnames[]; |
| 106 | |
| 107 | #endif /* _SYS_SYSCALLVAR_H_ */ |
| 108 | |