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linux_exec_machdep.c revision 1.16 
      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