/* $NetBSD: swapcontext.S,v 1.8 2013/09/12 15:36:16 joerg Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Klaus Klein. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "SYS.h" #if defined(LIBC_SCCS) && !defined(lint) RCSID("$NetBSD: swapcontext.S,v 1.8 2013/09/12 15:36:16 joerg Exp $") #endif /* LIBC_SCCS && !lint */ ENTRY(swapcontext) mov %o0, %o2 /* must save pointer */ mov %o1, %o3 /* must save pointer */ mov SYS_getcontext, %g1 t ST_SYSCALL bcc,a 1f stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */ ERROR() 1: add %o7, 12, %o1 stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */ add %o7, 8, %o1 stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */ #if __PIC__ - 0 >= 2 PIC_PROLOGUE(%g5,%o4) /* %g5 = _GLOBAL_OFFSET_TABLE */ set _C_LABEL(setcontext), %o5 ldx [%g5+%o5], %o4 jmp %o4 mov %o3, %o0 #elif __PIC__ - 0 >= 1 PIC_PROLOGUE(%g5,%o4) /* %g5 = _GLOBAL_OFFSET_TABLE */ ldx [%g5+_C_LABEL(setcontext)], %o4 jmp %o4 mov %o3, %o0 #else ba,a _C_LABEL(setcontext) mov %o3, %o0 #endif |