1 /* $OpenBSD: SYS.h,v 1.4 2023/12/11 22:29:25 deraadt 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 #define PINSYSCALL(sysno, label) \ 33 .pushsection .openbsd.syscalls,"",@progbits ;\ 34 .p2align 2 ;\ 35 .long label ;\ 36 .long sysno ;\ 37 .popsection 38 39 #ifdef __ASSEMBLER__ 40 /* 41 * If the system call number fits in a 8-bit signed value (i.e. fits in 7 bits), 42 * then we can use the #imm8 addressing mode. 43 */ 44 45 .macro systrap num 46 .iflt \num - 128 47 mov # \num, r0 48 99: trapa #0x80 49 PINSYSCALL(\num, 99b) 50 .else 51 mov.l 903f, r0 52 99: trapa #0x80 53 PINSYSCALL(\num, 99b) 54 bra 904f 55 nop 56 .align 2 57 903: .long \num 58 904: 59 .endif 60 .endm 61 #endif 62 63 #define SYSTRAP(x) \ 64 systrap SYS_ ## x 65 66 #define DL_SYSCALL(n) \ 67 .global __CONCAT(_dl_,n) ;\ 68 .type __CONCAT(_dl_,n)%function ;\ 69 __CONCAT(_dl_,n): ;\ 70 SYSTRAP(n) ;\ 71 bf .L_cerr ;\ 72 nop ;\ 73 rts ;\ 74 nop 75 76 .L_cerr: 77 neg r0, r0 78 rts 79 nop 80