1 /* $NetBSD: linux_exec_machdep.c,v 1.5 2008/04/28 20:23:42 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: linux_exec_machdep.c,v 1.5 2008/04/28 20:23:42 martin Exp $"); 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_vm86.h" 37 #include "opt_user_ldt.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/resource.h> 43 #include <sys/proc.h> 44 #include <sys/conf.h> 45 #include <sys/exec.h> 46 #include <sys/exec_elf.h> 47 #include <sys/vnode.h> 48 #include <sys/lwp.h> 49 50 #include <sys/cpu.h> 51 #include <machine/vmparam.h> 52 53 #include <uvm/uvm.h> 54 55 #include <compat/linux/common/linux_types.h> 56 #include <compat/linux/common/linux_signal.h> 57 #include <compat/linux/common/linux_util.h> 58 #include <compat/linux/common/linux_ioctl.h> 59 #include <compat/linux/common/linux_hdio.h> 60 #include <compat/linux/common/linux_exec.h> 61 #include <compat/linux/common/linux_machdep.h> 62 #include <compat/linux/common/linux_errno.h> 63 64 int 65 linux_exec_setup_stack(struct lwp *l, struct exec_package *epp) 66 { 67 u_long max_stack_size; 68 u_long access_linear_min, access_size; 69 u_long noaccess_linear_min, noaccess_size; 70 71 #ifndef USRSTACK32 72 #define USRSTACK32 (0x00000000ffffffffL&~PGOFSET) 73 #endif 74 75 if (epp->ep_flags & EXEC_32) { 76 epp->ep_minsaddr = USRSTACK32; 77 max_stack_size = MAXSSIZ; 78 } else { 79 epp->ep_minsaddr = USRSTACK; 80 max_stack_size = MAXSSIZ; 81 } 82 83 if (epp->ep_minsaddr > LINUX_USRSTACK) 84 epp->ep_minsaddr = LINUX_USRSTACK; 85 #ifdef DEBUG_LINUX 86 else { 87 /* 88 * Someone needs to make KERNBASE and TEXTADDR 89 * java versions < 1.4.2 need the stack to be 90 * at 0xC0000000 91 */ 92 uprintf("Cannot setup stack to 0xC0000000, " 93 "java will not work properly\n"); 94 } 95 #endif 96 epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr, 97 max_stack_size); 98 epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 99 100 /* 101 * set up commands for stack. note that this takes *two*, one to 102 * map the part of the stack which we can access, and one to map 103 * the part which we can't. 104 * 105 * arguably, it could be made into one, but that would require the 106 * addition of another mapping proc, which is unnecessary 107 */ 108 access_size = epp->ep_ssize; 109 access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size); 110 noaccess_size = max_stack_size - access_size; 111 noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr, 112 access_size), noaccess_size); 113 if (noaccess_size > 0) { 114 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size, 115 noaccess_linear_min, NULLVP, 0, VM_PROT_NONE); 116 } 117 KASSERT(access_size > 0); 118 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size, 119 access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE); 120 121 return 0; 122 } 123