SYS.h revision 50476
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91 37 * 38 * $FreeBSD: head/lib/libc/amd64/SYS.h 50476 1999-08-28 00:22:10Z peter $ 39 */ 40 41#include <sys/syscall.h> 42#include "DEFS.h" 43 44#define SYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \ 45 ENTRY(__CONCAT(_,x)); \ 46 .weak CNAME(x); \ 47 .set CNAME(x),CNAME(__CONCAT(_,x)); \ 48 lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b 49#define RSYSCALL(x) SYSCALL(x); ret 50 51#define PSEUDO(x,y) ENTRY(__CONCAT(_,x)); \ 52 .weak CNAME(x); \ 53 .set CNAME(x),CNAME(__CONCAT(_,x)); \ 54 lea __CONCAT(SYS_,y), %eax; KERNCALL; ret 55/* gas messes up offset -- although we don't currently need it, do for BCS */ 56#define LCALL(x,y) .byte 0x9a ; .long y; .word x 57 58/* 59 * Design note: 60 * 61 * The macros PSYSCALL() and PRSYSCALL() are intended for use where a 62 * syscall needs to be renamed in the threaded library. When building 63 * a normal library, they default to the traditional SYSCALL() and 64 * RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere 65 * that the renamed function needs to be called. 66 */ 67#ifdef _THREAD_SAFE 68/* 69 * For the thread_safe versions, we prepend _thread_sys_ to the function 70 * name so that the 'C' wrapper can go around the real name. 71 */ 72#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \ 73 ENTRY(__CONCAT(_thread_sys_,x)); \ 74 lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b 75#define PRSYSCALL(x) PSYSCALL(x); ret 76#define PPSEUDO(x,y) ENTRY(__CONCAT(_thread_sys_,x)); \ 77 lea __CONCAT(SYS_,y), %eax; KERNCALL; ret 78#else 79/* 80 * The non-threaded library defaults to traditional syscalls where 81 * the function name matches the syscall name. 82 */ 83#define PSYSCALL(x) SYSCALL(x) 84#define PRSYSCALL(x) RSYSCALL(x) 85#define PPSEUDO(x,y) PSEUDO(x,y) 86#endif 87 88#ifdef __ELF__ 89#define KERNCALL int $0x80 /* Faster */ 90#else 91#define KERNCALL LCALL(7,0) /* The old way */ 92#endif 93