1 /* $NetBSD: linux_exec_machdep.c,v 1.1 2004/11/13 06:01:34 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: linux_exec_machdep.c,v 1.1 2004/11/13 06:01:34 christos Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_vm86.h" 44 #include "opt_user_ldt.h" 45 #endif 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/resource.h> 50 #include <sys/proc.h> 51 #include <sys/conf.h> 52 #include <sys/exec.h> 53 #include <sys/exec_elf.h> 54 #include <sys/vnode.h> 55 #include <sys/lwp.h> 56 57 #include <machine/cpu.h> 58 #include <machine/vmparam.h> 59 60 #include <uvm/uvm.h> 61 62 #include <compat/linux/common/linux_types.h> 63 #include <compat/linux/common/linux_signal.h> 64 #include <compat/linux/common/linux_util.h> 65 #include <compat/linux/common/linux_ioctl.h> 66 #include <compat/linux/common/linux_hdio.h> 67 #include <compat/linux/common/linux_exec.h> 68 #include <compat/linux/common/linux_machdep.h> 69 #include <compat/linux/common/linux_errno.h> 70 71 int 72 linux_exec_setup_stack(struct proc *p, struct exec_package *epp) 73 { 74 u_long max_stack_size; 75 u_long access_linear_min, access_size; 76 u_long noaccess_linear_min, noaccess_size; 77 78 #ifndef USRSTACK32 79 #define USRSTACK32 (0x00000000ffffffffL&~PGOFSET) 80 #endif 81 82 if (epp->ep_flags & EXEC_32) { 83 epp->ep_minsaddr = USRSTACK32; 84 max_stack_size = MAXSSIZ; 85 } else { 86 epp->ep_minsaddr = USRSTACK; 87 max_stack_size = MAXSSIZ; 88 } 89 90 if (epp->ep_minsaddr > LINUX_USRSTACK) 91 epp->ep_minsaddr = LINUX_USRSTACK; 92 #ifdef DEBUG_LINUX 93 else { 94 /* 95 * Someone needs to make KERNBASE and TEXTADDR 96 * java versions < 1.4.2 need the stack to be 97 * at 0xC0000000 98 */ 99 uprintf("Cannot setup stack to 0xC0000000, " 100 "java will not work properly\n"); 101 } 102 #endif 103 epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr, 104 max_stack_size); 105 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 106 107 /* 108 * set up commands for stack. note that this takes *two*, one to 109 * map the part of the stack which we can access, and one to map 110 * the part which we can't. 111 * 112 * arguably, it could be made into one, but that would require the 113 * addition of another mapping proc, which is unnecessary 114 */ 115 access_size = epp->ep_ssize; 116 access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size); 117 noaccess_size = max_stack_size - access_size; 118 noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr, 119 access_size), noaccess_size); 120 if (noaccess_size > 0) { 121 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size, 122 noaccess_linear_min, NULLVP, 0, VM_PROT_NONE); 123 } 124 KASSERT(access_size > 0); 125 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size, 126 access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE); 127 128 return 0; 129 } 130