1 /* $OpenBSD: SYS.h,v 1.28 2023年12月10日 16:45:51 deraadt Exp $ */ 2 /*- 3 * Copyright (c) 1994 4 * Andrew Cagney. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Ralph Campbell. 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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)SYS.h 8.1 (Berkeley) 6/4/93 38 */ 39 40#include <sys/syscall.h> 41 42 /* r0 will be a non zero errno if there was an error, while r3/r4 will 43 contain the return value */ 44 45#include "DEFS.h" 46 47 48 /* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */ 49#define TCB_OFFSET_ERRNO (-8) 50 /* from <powerpc/tcb.h>: TCB address == %r2 - TCB_OFFSET */ 51#define TCB_OFFSET 0x7000 52 53 /* offset of errno from %r2 */ 54#define R2_OFFSET_ERRNO (-TCB_OFFSET + TCB_OFFSET_ERRNO) 55 56#define SYSENTRY(x) WEAK_ALIAS(x, _thread_sys_ ## x); \ 57 ENTRY(_thread_sys_ ## x) 58#define SYSENTRY_HIDDEN(x) ENTRY(_thread_sys_ ## x) 59#define __END_HIDDEN(x) END(_thread_sys_ ## x); \ 60 _HIDDEN_FALIAS(x, _thread_sys_ ## x); \ 61 END(_HIDDEN(x)) 62#define __END(x) __END_HIDDEN(x); END(x) 63 64#define PSEUDO_NOERROR(x,y) SYSENTRY(x) \ 65 RETGUARD_SETUP(x, %r11, %r12); \ 66 li %r0, SYS_ ## y ; \ 67 97: sc; \ 68 PINSYSCALL(SYS_ ## y, 97b); \ 69 RETGUARD_CHECK(x, %r11, %r12); \ 70 blr; \ 71 __END(x) 72 73#define PSEUDO_HIDDEN(x,y) SYSENTRY_HIDDEN(x) \ 74 RETGUARD_SETUP(x, %r11, %r12); \ 75 li %r0, SYS_ ## y; \ 76 97: sc; \ 77 PINSYSCALL(SYS_ ## y, 97b); \ 78 cmpwi %r0, 0; \ 79 beq+ .L_ret; \ 80 stw %r0, R2_OFFSET_ERRNO(2); \ 81 li %r3, -1; \ 82 li %r4, -1; /* for lseek */ \ 83 .L_ret: \ 84 RETGUARD_CHECK(x, %r11, %r12); \ 85 blr; \ 86 __END_HIDDEN(x) 87 88#define PSEUDO(x,y) WEAK_ALIAS(x, _thread_sys_ ## x); \ 89 PSEUDO_HIDDEN(x,y); \ 90 END(x) 91 92#define RSYSCALL(x) PSEUDO(x,x) 93#define RSYSCALL_HIDDEN(x) PSEUDO_HIDDEN(x,x) 94#define SYSCALL_END_HIDDEN(x) __END_HIDDEN(x) 95#define SYSCALL_END(x) __END(x) 96 97