130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
/* $NetBSD: linux_exec_machdep.c,v 1.4 2007/10/19 12:16:38 ad Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: linux_exec_machdep.c,v 1.4 2007/10/19 12:16:38 ad Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_vm86.h"
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#include "opt_user_ldt.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resource.h>
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#include <sys/proc.h>
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#include <sys/conf.h>
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#include <sys/exec.h>
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#include <sys/exec_elf.h>
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#include <sys/vnode.h>
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#include <sys/lwp.h>
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#include <sys/cpu.h>
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#include <machine/vmparam.h>
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#include <uvm/uvm.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_ioctl.h>
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#include <compat/linux/common/linux_hdio.h>
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#include <compat/linux/common/linux_exec.h>
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#include <compat/linux/common/linux_machdep.h>
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#include <compat/linux/common/linux_errno.h>
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int
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linux_exec_setup_stack(struct lwp *l, struct exec_package *epp)
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{
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u_long max_stack_size;
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u_long access_linear_min, access_size;
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u_long noaccess_linear_min, noaccess_size;
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#ifndef USRSTACK32
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#define USRSTACK32 (0x00000000ffffffffL&~PGOFSET)
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#endif
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if (epp->ep_flags & EXEC_32) {
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epp->ep_minsaddr = USRSTACK32;
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max_stack_size = MAXSSIZ;
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} else {
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epp->ep_minsaddr = USRSTACK;
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max_stack_size = MAXSSIZ;
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}
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if (epp->ep_minsaddr > LINUX_USRSTACK)
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epp->ep_minsaddr = LINUX_USRSTACK;
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#ifdef DEBUG_LINUX
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else {
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/*
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* Someone needs to make KERNBASE and TEXTADDR
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* java versions < 1.4.2 need the stack to be
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* at 0xC0000000
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*/
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uprintf("Cannot setup stack to 0xC0000000, "
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"java will not work properly\n");
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}
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#endif
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epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr,
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max_stack_size);
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epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur;
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/*
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* set up commands for stack. note that this takes *two*, one to
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* map the part of the stack which we can access, and one to map
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* the part which we can't.
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*
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* arguably, it could be made into one, but that would require the
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* addition of another mapping proc, which is unnecessary
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*/
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access_size = epp->ep_ssize;
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access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size);
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noaccess_size = max_stack_size - access_size;
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noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr,
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access_size), noaccess_size);
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if (noaccess_size > 0) {
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
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noaccess_linear_min, NULLVP, 0, VM_PROT_NONE);
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}
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KASSERT(access_size > 0);
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size,
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access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE);
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return 0;
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}
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