1 /* $NetBSD: SYS.h,v 1.15 2013/09/12 15:36:16 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)SYS.h 8.1 (Berkeley) 6/4/93 36 * 37 * from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp 38 */ 39 40 #include <machine/asm.h> 41 #include <sys/syscall.h> 42 #include <machine/trap.h> 43 44 #ifdef __STDC__ 45 #define _CAT(x,y) x##y 46 #else 47 #define _CAT(x,y) x/**/y 48 #endif 49 50 /* 51 * ERROR branches to cerror. This is done with a macro so that I can 52 * change it to be position independent later, if need be. 53 */ 54 #if __PIC__ - 0 >= 2 55 #define JUMP(name) \ 56 PIC_PROLOGUE(%g1,%g5); \ 57 sethi %hi(_C_LABEL(name)),%g5; \ 58 or %g5,%lo(_C_LABEL(name)),%g5; \ 59 ldx [%g1+%g5],%g5; \ 60 jmp %g5; \ 61 nop 62 #elif __PIC__ - 0 >= 1 63 #define JUMP(name) \ 64 PIC_PROLOGUE(%g1,%g5); \ 65 ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop 66 #else 67 #define JUMP(name) set _C_LABEL(name),%g1; jmp %g1; nop 68 #endif 69 #define ERROR() JUMP(__cerror) 70 /* 71 * SYSCALL is used when further action must be taken before returning. 72 * Note that it adds a `nop' over what we could do, if we only knew what 73 * came at label 1.... 74 */ 75 #define _SYSCALL(x,y) \ 76 ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1: 77 78 #define SYSCALL(x) \ 79 _SYSCALL(x,x) 80 81 /* 82 * RSYSCALL is used when the system call should just return. Here 83 * we use the SYSCALL_G5RFLAG to put the `success' return address in %g5 84 * and avoid a branch. 85 */ 86 #define RSYSCALL(x) \ 87 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \ 88 t ST_SYSCALL; ERROR() 89 90 /* 91 * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x. 92 */ 93 #define PSEUDO(x,y) \ 94 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \ 95 t ST_SYSCALL; ERROR() 96 97 /* 98 * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is 99 * a weak internal alias for the strong symbol. 100 */ 101 #define WSYSCALL(weak,strong) \ 102 WEAK_ALIAS(weak,strong); \ 103 PSEUDO(strong,weak) 104 105 /* 106 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls 107 * that never fail. 108 * 109 * XXX - This should be optimized. 110 */ 111 #define SYSCALL_NOERROR(x) \ 112 ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL 113 114 /* 115 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls 116 * that never fail. 117 * 118 * XXX - This should be optimized. 119 */ 120 #define RSYSCALL_NOERROR(x) \ 121 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \ 122 t ST_SYSCALL 123 124 /* 125 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x. 126 */ 127 #define PSEUDO_NOERROR(x,y) \ 128 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \ 129 t ST_SYSCALL 130 131 .globl _C_LABEL(__cerror) 132