/* $NetBSD: _resumecontext.S,v 1.13 2020/10/15 05:27:53 skrll Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Wayne Knowles. * * 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 <machine/asm.h> #include "SYS.h" #include "assym.h" #if defined(SYSLIBC_SCCS) && !defined(lint) RCSID("$NetBSD: _resumecontext.S,v 1.13 2020/10/15 05:27:53 skrll Exp $") #endif /* SYSLIBC_SCCS && !lint */ .set reorder .hidden _C_LABEL(__resumecontext) LEAF_NOPROFILE(__resumecontext) /* * We get here not by a call through $t9 but thru $ra after the * function passed to makecontext returns. Therefore, we need * to recover gp from ra */ #if defined(__mips_o32) || defined(__mips_o64) .set push .set noreorder .cpload ra .set pop #endif #if defined(__mips_n32) || defined(__mips_n64) .cpsetup ra, t3, __resumecontext #endif PTR_SUBU sp, sp, UCONTEXT_SIZE # get space for ucontext move a0, sp # arg0 for getcontext PTR_S zero, _UC_LINK(a0) # make sure uc_link is 0 SYSTRAP(getcontext) # get context #if defined(__mips_n32) || defined(__mips_n64) REG_PROLOGUE /* We saved gp in t2 above */ REG_S t3, _UC_GREGS_GP(a0) REG_EPILOGUE #endif PTR_L a0, _UC_LINK(a0) # linked context? NOP_L beq a0, zero, 1f # nope, exit process nop PIC_TAILCALL(setcontext) # yes, become it. /* NOTREACHED (in theory) */ li a0, -1 # failure, 1: SYSTRAP(exit) # all hope is lost. /* NOTREACHED */ END(__resumecontext) |