SYS.h revision 56809
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 56809 2000-01-29 12:50:47Z jasone $ 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 50#define RSYSCALL(x) SYSCALL(x); ret 51 52#define PSEUDO(x,y) ENTRY(__CONCAT(_,x)); \ 53 .weak CNAME(x); \ 54 .set CNAME(x),CNAME(__CONCAT(_,x)); \ 55 lea __CONCAT(SYS_,y), %eax; KERNCALL; ret 56 57/* gas messes up offset -- although we don't currently need it, do for BCS */ 58#define LCALL(x,y) .byte 0x9a ; .long y; .word x 59 60/* 61 * Design note: 62 * 63 * The macros PSYSCALL() and PRSYSCALL() are intended for use where a 64 * syscall needs to be renamed in the threaded library. When building 65 * a normal library, they default to the traditional SYSCALL() and 66 * RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere 67 * that the renamed function needs to be called. 68 */ 69#ifdef _THREAD_SAFE 70/* 71 * For the thread_safe versions, we prepend _thread_sys_ to the function 72 * name so that the 'C' wrapper can go around the real name. 73 */ 74#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \ 75 ENTRY(__CONCAT(_thread_sys_,x)); \ 76 .weak CNAME(__CONCAT(_,x)); \ 77 .set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(_thread_sys_,x));\ 78 .weak CNAME(x); \ 79 .set CNAME(x),CNAME(__CONCAT(_,x)); \ 80 lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b 81#define PRSYSCALL(x) PSYSCALL(x); ret 82#define PPSEUDO(x,y) ENTRY(__CONCAT(_thread_sys_,x)); \ 83 lea __CONCAT(SYS_,y), %eax; KERNCALL; ret 84#else 85/* 86 * The non-threaded library defaults to traditional syscalls where 87 * the function name matches the syscall name. 88 */ 89#define PSYSCALL(x) SYSCALL(x) 90#define PRSYSCALL(x) RSYSCALL(x) 91#define PPSEUDO(x,y) PSEUDO(x,y) 92#endif 93 94#ifdef __ELF__ 95#define KERNCALL int $0x80 /* Faster */ 96#else 97#define KERNCALL LCALL(7,0) /* The old way */ 98#endif 99