1 /* $OpenBSD: SYS.h,v 1.3 2023/12/11 22:29:25 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2016 Dale Rahn <drahn@openbsd.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #include <machine/asm.h> 30 #include <sys/syscall.h> 31 32 #define PINSYSCALL(sysno, label) \ 33 .pushsection .openbsd.syscalls,"",@progbits ;\ 34 .p2align 2 ;\ 35 .long label ;\ 36 .long sysno ;\ 37 .popsection 38 39 #define SYSTRAP(x) \ 40 li t0, SYS_ ## x ;\ 41 99: ecall ;\ 42 PINSYSCALL(SYS_ ## x, 99b) 43 /* XXX fence */ 44 45 #define DL_SYSCALL(n) \ 46 .global __CONCAT(_dl_,n) ;\ 47 .type __CONCAT(_dl_,n)%function ;\ 48 __CONCAT(_dl_,n): ;\ 49 RETGUARD_SETUP(__CONCAT(_dl_,n), x15) ;\ 50 SYSTRAP(n) ;\ 51 beqz t0, 1f ;\ 52 sub a0, zero, a0 /* r0 = -errno */ ;\ 53 1: ;\ 54 RETGUARD_CHECK(__CONCAT(_dl_,n), x15) ;\ 55 ret 56