1*84d9c625SLionel Sambuc/* $NetBSD: swapcontext.S,v 1.8 2013/09/12 15:36:16 joerg Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/*- 42fe8fb19SBen Gras * Copyright (c) 2001 The NetBSD Foundation, Inc. 52fe8fb19SBen Gras * All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * This code is derived from software contributed to The NetBSD Foundation 82fe8fb19SBen Gras * by Klaus Klein. 92fe8fb19SBen Gras * 102fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 112fe8fb19SBen Gras * modification, are permitted provided that the following conditions 122fe8fb19SBen Gras * are met: 132fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 142fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 152fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 162fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 172fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 182fe8fb19SBen Gras * 192fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 202fe8fb19SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 212fe8fb19SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 222fe8fb19SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 232fe8fb19SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 242fe8fb19SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 252fe8fb19SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 262fe8fb19SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 272fe8fb19SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 282fe8fb19SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 292fe8fb19SBen Gras * POSSIBILITY OF SUCH DAMAGE. 302fe8fb19SBen Gras */ 312fe8fb19SBen Gras 322fe8fb19SBen Gras#include "SYS.h" 332fe8fb19SBen Gras 342fe8fb19SBen Gras#if defined(LIBC_SCCS) && !defined(lint) 35*84d9c625SLionel Sambuc RCSID("$NetBSD: swapcontext.S,v 1.8 2013/09/12 15:36:16 joerg Exp $") 362fe8fb19SBen Gras#endif /* LIBC_SCCS && !lint */ 372fe8fb19SBen Gras 382fe8fb19SBen Gras 392fe8fb19SBen GrasENTRY(swapcontext) 402fe8fb19SBen Gras mov %o0, %o2 /* must save pointer */ 412fe8fb19SBen Gras mov %o1, %o3 /* must save pointer */ 422fe8fb19SBen Gras mov SYS_getcontext, %g1 432fe8fb19SBen Gras t ST_SYSCALL 442fe8fb19SBen Gras bcc,a 1f 452fe8fb19SBen Gras stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */ 462fe8fb19SBen Gras ERROR() 472fe8fb19SBen Gras1: 482fe8fb19SBen Gras add %o7, 12, %o1 492fe8fb19SBen Gras stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */ 502fe8fb19SBen Gras add %o7, 8, %o1 512fe8fb19SBen Gras stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */ 522fe8fb19SBen Gras 53*84d9c625SLionel Sambuc#if __PIC__ - 0 >= 2 54e415d488SLionel Sambuc PIC_PROLOGUE(%g5,%o4) /* %g5 = _GLOBAL_OFFSET_TABLE */ 55f14fb602SLionel Sambuc set _C_LABEL(setcontext), %o5 56f14fb602SLionel Sambuc ldx [%g5+%o5], %o4 57*84d9c625SLionel Sambuc jmp %o4 58*84d9c625SLionel Sambuc mov %o3, %o0 59*84d9c625SLionel Sambuc#elif __PIC__ - 0 >= 1 60*84d9c625SLionel Sambuc PIC_PROLOGUE(%g5,%o4) /* %g5 = _GLOBAL_OFFSET_TABLE */ 61f14fb602SLionel Sambuc ldx [%g5+_C_LABEL(setcontext)], %o4 62f14fb602SLionel Sambuc jmp %o4 632fe8fb19SBen Gras mov %o3, %o0 64e415d488SLionel Sambuc#else 65e415d488SLionel Sambuc ba,a _C_LABEL(setcontext) 66e415d488SLionel Sambuc mov %o3, %o0 67e415d488SLionel Sambuc#endif 68