1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)SYS.h 8.1 (Berkeley) 6/4/93 34 * 35 * from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp 36 * $NetBSD: SYS.h,v 1.15 2003/08/07 16:42:23 agc Exp $ 37 */ 38 39 #include <machine/asm.h> 40 #include <sys/syscall.h> 41 #include <machine/trap.h> 42 43 #ifdef __STDC__ 44 #define _CAT(x,y) x##y 45 #else 46 #define _CAT(x,y) x/**/y 47 #endif 48 49 #ifdef __ELF__ 50 #define CERROR _C_LABEL(__cerror) 51 #define CURBRK _C_LABEL(__curbrk) 52 #else 53 #define CERROR _ASM_LABEL(cerror) 54 #define CURBRK _ASM_LABEL(curbrk) 55 #endif 56 57 /* 58 * ERROR branches to cerror. This is done with a macro so that I can 59 * change it to be position independent later, if need be. 60 */ 61 #ifdef PIC 62 #define CALL(name) \ 63 PIC_PROLOGUE(%g1,%g2); \ 64 ld [%g1+name],%g2; jmp %g2; nop 65 #else 66 #define CALL(name) \ 67 sethi %hi(name),%g1; or %lo(name),%g1,%g1; jmp %g1; nop 68 #endif 69 #define ERROR() CALL(CERROR) 70 71 /* 72 * SYSCALL is used when further action must be taken before returning. 73 * Note that it adds a `nop' over what we could do, if we only knew what 74 * came at label 1.... 75 */ 76 #define _SYSCALL(x,y) \ 77 ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1: 78 79 #define SYSCALL(x) \ 80 _SYSCALL(x,x) 81 82 /* 83 * RSYSCALL is used when the system call should just return. Here 84 * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2 85 * and avoid a branch. 86 */ 87 #define RSYSCALL(x) \ 88 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 89 t ST_SYSCALL; ERROR() 90 91 /* 92 * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x. 93 */ 94 #define PSEUDO(x,y) \ 95 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 96 t ST_SYSCALL; ERROR() 97 98 /* 99 * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is 100 * a weak internal alias for the strong symbol. 101 */ 102 #ifdef WEAK_ALIAS 103 #define WSYSCALL(weak,strong) \ 104 WEAK_ALIAS(weak,strong); \ 105 PSEUDO(strong,weak) 106 #else 107 #define WSYSCALL(weak,strong) \ 108 RSYSCALL(weak) 109 #endif 110 111 /* 112 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls 113 * that never fail. 114 * 115 * XXX - This should be optimized. 116 */ 117 #define SYSCALL_NOERROR(x) \ 118 ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL 119 120 /* 121 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls 122 * that never fail. 123 * 124 * XXX - This should be optimized. 125 */ 126 #define RSYSCALL_NOERROR(x) \ 127 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 128 t ST_SYSCALL 129 130 /* 131 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x. 132 */ 133 #define PSEUDO_NOERROR(x,y) \ 134 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 135 t ST_SYSCALL 136 137 .globl CERROR 138