/* $NetBSD: svr4_sigcode.S,v 1.12.10.1 2009/04/04 17:39:09 snj Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * 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. */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)locore.s 7.3 (Berkeley) 5/13/91 */ #include <machine/asm.h> __KERNEL_RCSID(0, "$NetBSD: svr4_sigcode.S,v 1.12.10.1 2009/04/04 17:39:09 snj Exp $"); #if defined(_KERNEL_OPT) #include "opt_vm86.h" #include "opt_multiprocessor.h" #endif #include "assym.h" #include <machine/segments.h> #include <machine/trap.h> #include <compat/svr4/svr4_syscall.h> #include <machine/frameasm.h> /* * Signal trampoline; copied to top of user stack. */ /* LINTSTUB: Var: char svr4_sigcode[1], svr4_esigcode[1]; */ NENTRY(svr4_sigcode) call *SVR4_SIGF_HANDLER(%esp) leal SVR4_SIGF_UC(%esp),%eax # ucp (the call may have clobbered the # copy at SIGF_UCP(%esp)) pushl %eax pushl $1 # setcontext(p) == syscontext(1, p) pushl %eax # junk to fake return address movl $SVR4_SYS_context,%eax int $0x80 # enter kernel with args on stack movl $SVR4_SYS_exit,%eax int $0x80 # exit if sigreturn fails .globl _C_LABEL(svr4_esigcode) _C_LABEL(svr4_esigcode): IDTVEC(svr4_fasttrap) pushl $2 # size of instruction for restart pushl $T_ASTFLT # trap # for doing ASTs INTRENTRY STI(%eax) call _C_LABEL(svr4_fasttrap) 2: /* Check for ASTs on exit to user mode. */ cli CHECK_ASTPENDING(%eax) je 1f /* Always returning to user mode here. */ CLEAR_ASTPENDING(%eax) sti /* Pushed T_ASTFLT into tf_trapno on entry. */ pushl %esp call _C_LABEL(trap) addl $4,%esp jmp 2b 1: CHECK_DEFERRED_SWITCH jnz 9f INTRFASTEXIT 9: sti call _C_LABEL(pmap_load) cli jmp 2b