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linux_exec_machdep.c revision 1.4 
      1 /*	$NetBSD: linux_exec_machdep.c,v 1.4 2007/10/19 12:16:38 ad 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 1.4 2007/10/19 12:16:38 ad 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 <sys/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 lwp *l, 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 = l->l_proc->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