1/* $NetBSD: swapcontext.S,v 1.8 2013/09/12 15:36:16 joerg Exp $ */ 2 3/*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "SYS.h" 33 34#if defined(LIBC_SCCS) && !defined(lint) 35 RCSID("$NetBSD: swapcontext.S,v 1.8 2013/09/12 15:36:16 joerg Exp $") 36#endif /* LIBC_SCCS && !lint */ 37 38 39ENTRY(swapcontext) 40 mov %o0, %o2 /* must save pointer */ 41 mov %o1, %o3 /* must save pointer */ 42 mov SYS_getcontext, %g1 43 t ST_SYSCALL 44 bcc,a 1f 45 stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */ 46 ERROR() 471: 48 add %o7, 12, %o1 49 stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */ 50 add %o7, 8, %o1 51 stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */ 52 53#if __PIC__ - 0 >= 2 54 PIC_PROLOGUE(%g5,%o4) /* %g5 = _GLOBAL_OFFSET_TABLE */ 55 set _C_LABEL(setcontext), %o5 56 ldx [%g5+%o5], %o4 57 jmp %o4 58 mov %o3, %o0 59#elif __PIC__ - 0 >= 1 60 PIC_PROLOGUE(%g5,%o4) /* %g5 = _GLOBAL_OFFSET_TABLE */ 61 ldx [%g5+_C_LABEL(setcontext)], %o4 62 jmp %o4 63 mov %o3, %o0 64#else 65 ba,a _C_LABEL(setcontext) 66 mov %o3, %o0 67#endif 68