swapcontext.S revision 1.7
11.7Sskrll/* $NetBSD: swapcontext.S,v 1.7 2016/09/21 06:49:39 skrll Exp $ */ 21.2Sthorpej 31.2Sthorpej/*- 41.2Sthorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 51.2Sthorpej * All rights reserved. 61.2Sthorpej * 71.2Sthorpej * This code is derived from software contributed to The NetBSD Foundation 81.2Sthorpej * by Klaus Klein. 91.2Sthorpej * 101.2Sthorpej * Redistribution and use in source and binary forms, with or without 111.2Sthorpej * modification, are permitted provided that the following conditions 121.2Sthorpej * are met: 131.2Sthorpej * 1. Redistributions of source code must retain the above copyright 141.2Sthorpej * notice, this list of conditions and the following disclaimer. 151.2Sthorpej * 2. Redistributions in binary form must reproduce the above copyright 161.2Sthorpej * notice, this list of conditions and the following disclaimer in the 171.2Sthorpej * documentation and/or other materials provided with the distribution. 181.2Sthorpej * 191.2Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.2Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.2Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.2Sthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.2Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.2Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.2Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.2Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.2Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.2Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.2Sthorpej * POSSIBILITY OF SUCH DAMAGE. 301.2Sthorpej */ 311.2Sthorpej 321.2Sthorpej#include "SYS.h" 331.4Smatt#include "assym.h" 341.2Sthorpej 351.2Sthorpej#if defined(SYSLIBC_SCCS) && !defined(lint) 361.7Sskrll RCSID("$NetBSD: swapcontext.S,v 1.7 2016/09/21 06:49:39 skrll Exp $") 371.2Sthorpej#endif /* SYSLIBC_SCCS && !lint */ 381.2Sthorpej 391.2Sthorpej .set reorder 401.6Sskrll 411.2SthorpejNESTED(swapcontext, CALLFRAME_SIZ, ra) 421.2Sthorpej .mask 0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ) 431.7Sskrll PIC_PROLOGUE(swapcontext) 441.4Smatt PTR_SUBU sp, sp, CALLFRAME_SIZ 451.4Smatt PTR_S ra, CALLFRAME_RA(sp) # save ra 461.4Smatt PTR_S a0, 0(sp) # stash away oucp 471.4Smatt PTR_S a1, SZREG(sp) # stash away ucp 481.2Sthorpej SYSTRAP(getcontext) 491.4Smatt PTR_L ra, CALLFRAME_RA(sp) 501.4Smatt bne a3, zero, 1f 511.2Sthorpej 521.4Smatt PTR_L v1, 0(sp) # load oucp again for adjustment 531.4Smatt PTR_L a0, SZREG(sp) # load ucp 541.4Smatt PTR_ADDIU v0, sp, CALLFRAME_SIZ 551.2Sthorpej REG_PROLOGUE 561.4Smatt REG_S zero, _OFFSETOF_UC_GREGS_V0(v1) 571.7Sskrll#if defined(__mips_n32) || defined(__mips_n64) 581.7Sskrll /* PIC_PROLOGUE saved gp in t3 */ 591.7Sskrll REG_S t3, _OFFSETOF_UC_GREGS_GP(v1) 601.7Sskrll#endif 611.4Smatt REG_S ra, _OFFSETOF_UC_GREGS_EPC(v1) 621.4Smatt REG_S v0, _OFFSETOF_UC_GREGS_SP(v1) 631.2Sthorpej REG_EPILOGUE 641.2Sthorpej 651.5Smanu PIC_TAILCALL(setcontext) 661.2Sthorpej /* NOTREACHED */ 671.2Sthorpej1: 681.4Smatt PTR_ADDU sp, sp, CALLFRAME_SIZ 691.4Smatt SETUP_GPX(t0); 701.4Smatt SETUP_GP64(t3,swapcontext); 711.4Smatt PIC_TAILCALL(__cerror) 721.2SthorpejEND(swapcontext) 73