1 /* $NetBSD: SYS.h,v 1.13 2003/08/07 16:42:26 agc 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 #ifdef PIC 55 #ifdef BIGPIC 56 #define JUMP(name) \ 57 PIC_PROLOGUE(%g1,%g5); \ 58 sethi %hi(_C_LABEL(name)),%g5; \ 59 or %g5,%lo(_C_LABEL(name)),%g5; \ 60 ldx [%g1+%g5],%g5; \ 61 jmp %g5; \ 62 nop 63 #else 64 #define JUMP(name) \ 65 PIC_PROLOGUE(%g1,%g5); \ 66 ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop 67 #endif 68 #else 69 #define JUMP(name) set _C_LABEL(name),%g1; jmp %g1; nop 70 #endif 71 #define ERROR() JUMP(__cerror) 72 /* 73 * SYSCALL is used when further action must be taken before returning. 74 * Note that it adds a `nop' over what we could do, if we only knew what 75 * came at label 1.... 76 */ 77 #define _SYSCALL(x,y) \ 78 ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1: 79 80 #define SYSCALL(x) \ 81 _SYSCALL(x,x) 82 83 /* 84 * RSYSCALL is used when the system call should just return. Here 85 * we use the SYSCALL_G7RFLAG to put the `success' return address in %g7 86 * and avoid a branch. 87 */ 88 #define RSYSCALL(x) \ 89 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 90 t ST_SYSCALL; ERROR() 91 92 /* 93 * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x. 94 */ 95 #define PSEUDO(x,y) \ 96 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 97 t ST_SYSCALL; ERROR() 98 99 /* 100 * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is 101 * a weak internal alias for the strong symbol. 102 */ 103 #define WSYSCALL(weak,strong) \ 104 WEAK_ALIAS(weak,strong); \ 105 PSEUDO(strong,weak) 106 107 /* 108 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls 109 * that never fail. 110 * 111 * XXX - This should be optimized. 112 */ 113 #define SYSCALL_NOERROR(x) \ 114 ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL 115 116 /* 117 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls 118 * that never fail. 119 * 120 * XXX - This should be optimized. 121 */ 122 #define RSYSCALL_NOERROR(x) \ 123 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 124 t ST_SYSCALL 125 126 /* 127 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x. 128 */ 129 #define PSEUDO_NOERROR(x,y) \ 130 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 131 t ST_SYSCALL 132 133 .register %g7,#scratch 134 135 .globl _C_LABEL(__cerror) 136