1 /* $OpenBSD: SYS.h,v 1.5 2023/12/11 22:29:24 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2002,2004 Dale Rahn 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 #include <sys/syscall.h> 31 #include <machine/asm.h> 32 33 #define PINSYSCALL(sysno, label) \ 34 .pushsection .openbsd.syscalls,"",@progbits ;\ 35 .p2align 2 ;\ 36 .long label ;\ 37 .long sysno ;\ 38 .popsection 39 40 #define DL_SYSCALL(n) \ 41 .global __CONCAT(_dl_,n) ;\ 42 .type __CONCAT(_dl_,n), @function ;\ 43 .align 16,0xcc ;\ 44 __CONCAT(_dl_,n): ;\ 45 endbr64 ;\ 46 RETGUARD_SETUP(_dl_##n, r11) ;\ 47 RETGUARD_PUSH(r11) ;\ 48 movl $(__CONCAT(SYS_,n)), %eax ;\ 49 movq %rcx, %r10 ;\ 50 99: syscall ;\ 51 PINSYSCALL(__CONCAT(SYS_,n), 99b) ;\ 52 jnc 1f ;\ 53 neg %rax ;\ 54 1: RETGUARD_POP(r11) ;\ 55 RETGUARD_CHECK(_dl_##n, r11) ;\ 56 ret 57