1 /*- 2 * Copyright (c) 2014 Andrew Turner 3 * Copyright (c) 2015 The FreeBSD Foundation 4 * 5 * This software was developed by Andrew Turner under 6 * sponsorship from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 30 #include <sys/syscall.h> 31 #include <machine/asm.h> 32 33 #define _SYSCALL(name) \ 34 mov x8, SYS_ ## name; \ 35 svc 0 36 37 #ifndef _SYSCALL_BODY 38 /* 39 * Conditional jumps can only go up to one megabyte in either 40 * direction, and cerror can be located anywhere, so we have 41 * to jump around to use more capable unconditional branch 42 * instruction. 43 */ 44 #define _SYSCALL_BODY(name) \ 45 _SYSCALL(name); \ 46 b.cs 1f; \ 47 ret; \ 48 1: b cerror 49 #endif 50 51 #define PSEUDO(name) \ 52 ENTRY(__sys_##name); \ 53 WEAK_REFERENCE(__sys_##name, _##name); \ 54 _SYSCALL_BODY(name); \ 55 END(__sys_##name) 56 57 #define RSYSCALL(name) \ 58 ENTRY(__sys_##name); \ 59 WEAK_REFERENCE(__sys_##name, name); \ 60 WEAK_REFERENCE(__sys_##name, _##name); \ 61 _SYSCALL_BODY(name); \ 62 END(__sys_##name) 63