1 /* $NetBSD: linux_exec_machdep.c,v 1.16 2010/07/07 01:30:34 chs 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 1.16 2010/07/07 01:30:34 chs 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 <sys/syscallargs.h> 56 57 #ifndef DEBUG_LINUX 58 #define DPRINTF(a) 59 #else 60 #define DPRINTF(a) uprintf a 61 #endif 62 63 #include <compat/linux/common/linux_types.h> 64 #include <compat/linux/common/linux_signal.h> 65 #include <compat/linux/common/linux_machdep.h> 66 #include <compat/linux/common/linux_util.h> 67 #include <compat/linux/common/linux_ioctl.h> 68 #include <compat/linux/common/linux_hdio.h> 69 #include <compat/linux/common/linux_exec.h> 70 #include <compat/linux/common/linux_errno.h> 71 #include <compat/linux/linux_syscallargs.h> 72 73 int 74 linux_exec_setup_stack(struct lwp *l, struct exec_package *epp) 75 { 76 u_long max_stack_size; 77 u_long access_linear_min, access_size; 78 u_long noaccess_linear_min, noaccess_size; 79 80 #ifndef USRSTACK32 81 #define USRSTACK32 (0x00000000ffffffffL&~PGOFSET) 82 #endif 83 84 if (epp->ep_flags & EXEC_32) { 85 epp->ep_minsaddr = USRSTACK32; 86 max_stack_size = MAXSSIZ; 87 } else { 88 epp->ep_minsaddr = USRSTACK; 89 max_stack_size = MAXSSIZ; 90 } 91 92 if (epp->ep_minsaddr > LINUX_USRSTACK) 93 epp->ep_minsaddr = LINUX_USRSTACK; 94 #ifdef DEBUG_LINUX 95 else { 96 /* 97 * Someone needs to make KERNBASE and TEXTADDR 98 * java versions < 1.4.2 need the stack to be 99 * at 0xC0000000 100 */ 101 uprintf("Cannot setup stack to 0xC0000000, " 102 "java will not work properly\n"); 103 } 104 #endif 105 epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr, 106 max_stack_size); 107 epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 108 109 /* 110 * set up commands for stack. note that this takes *two*, one to 111 * map the part of the stack which we can access, and one to map 112 * the part which we can't. 113 * 114 * arguably, it could be made into one, but that would require the 115 * addition of another mapping proc, which is unnecessary 116 */ 117 access_size = epp->ep_ssize; 118 access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size); 119 noaccess_size = max_stack_size - access_size; 120 noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr, 121 access_size), noaccess_size); 122 if (noaccess_size > 0) { 123 NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size, 124 noaccess_linear_min, NULLVP, 0, VM_PROT_NONE, VMCMD_STACK); 125 } 126 KASSERT(access_size > 0); 127 NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, access_size, 128 access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE, 129 VMCMD_STACK); 130 131 return 0; 132 } 133 134 int 135 linux_sys_set_thread_area(struct lwp *l, 136 const struct linux_sys_set_thread_area_args *uap, register_t *retval) 137 { 138 /* { 139 syscallarg(struct linux_user_desc *) desc; 140 } */ 141 142 return linux_lwp_setprivate(l, SCARG(uap, desc)); 143 } 144 145 int 146 linux_sys_get_thread_area(struct lwp *l, 147 const struct linux_sys_get_thread_area_args *uap, register_t *retval) 148 { 149 /* { 150 syscallarg(struct linux_user_desc *) desc; 151 } */ 152 153 /* glibc doesn't actually call this. */ 154 return ENOSYS; 155 } 156