1 /* $OpenBSD: SYS.h,v 1.2 2022/09/02 06:19:05 miod Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Dale Rahn 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 #ifdef __ASSEMBLER__ 33 /* 34 * If the system call number fits in a 8-bit signed value (i.e. fits in 7 bits), 35 * then we can use the #imm8 addressing mode. 36 */ 37 38 .macro systrap num 39 .iflt \num - 128 40 mov # \num, r0 41 trapa #0x80 42 .else 43 mov.l 903f, r0 44 trapa #0x80 45 bra 904f 46 nop 47 .align 2 48 903: .long \num 49 904: 50 .endif 51 .endm 52 #endif 53 54 #define SYSTRAP(x) \ 55 systrap SYS_ ## x 56 57 #define DL_SYSCALL(n) \ 58 .global __CONCAT(_dl_,n) ;\ 59 .type __CONCAT(_dl_,n)%function ;\ 60 __CONCAT(_dl_,n): ;\ 61 SYSTRAP(n) ;\ 62 bf .L_cerr ;\ 63 nop ;\ 64 rts ;\ 65 nop 66 67 .L_cerr: 68 neg r0, r0 69 rts 70 nop 71