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      1  1.2  riastrad /*	$NetBSD: linux32_exec_machdep.c,v 1.2 2023/04/09 12:29:26 riastradh Exp $	*/
      2  1.1       ryo 
      3  1.1       ryo /*
      4  1.1       ryo  * Copyright (c) 1993, 1994, 1996 Christopher G. Demetriou
      5  1.1       ryo  * All rights reserved.
      6  1.1       ryo  *
      7  1.1       ryo  * Redistribution and use in source and binary forms, with or without
      8  1.1       ryo  * modification, are permitted provided that the following conditions
      9  1.1       ryo  * are met:
     10  1.1       ryo  * 1. Redistributions of source code must retain the above copyright
     11  1.1       ryo  *    notice, this list of conditions and the following disclaimer.
     12  1.1       ryo  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1       ryo  *    notice, this list of conditions and the following disclaimer in the
     14  1.1       ryo  *    documentation and/or other materials provided with the distribution.
     15  1.1       ryo  * 3. All advertising materials mentioning features or use of this software
     16  1.1       ryo  *    must display the following acknowledgement:
     17  1.1       ryo  *      This product includes software developed by Christopher G. Demetriou.
     18  1.1       ryo  * 4. The name of the author may not be used to endorse or promote products
     19  1.1       ryo  *    derived from this software without specific prior written permission
     20  1.1       ryo  *
     21  1.1       ryo  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  1.1       ryo  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  1.1       ryo  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  1.1       ryo  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  1.1       ryo  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  1.1       ryo  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  1.1       ryo  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  1.1       ryo  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  1.1       ryo  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  1.1       ryo  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  1.1       ryo  */
     32  1.1       ryo 
     33  1.1       ryo #include <sys/cdefs.h>
     34  1.2  riastrad __KERNEL_RCSID(0, "$NetBSD: linux32_exec_machdep.c,v 1.2 2023/04/09 12:29:26 riastradh Exp $");
     35  1.1       ryo 
     36  1.1       ryo #include <sys/param.h>
     37  1.1       ryo #include <sys/types.h>
     38  1.1       ryo #include <sys/exec.h>
     39  1.1       ryo #include <sys/lwp.h>
     40  1.1       ryo #include <sys/syscallargs.h>
     41  1.1       ryo #include <sys/vnode.h>
     42  1.1       ryo 
     43  1.1       ryo #include <machine/vmparam.h>
     44  1.1       ryo 
     45  1.1       ryo #include <compat/linux/common/linux_types.h>
     46  1.1       ryo #include <compat/linux/common/linux_exec.h>
     47  1.1       ryo #include <compat/linux32/common/linux32_exec.h>
     48  1.1       ryo 
     49  1.1       ryo #ifdef LINUX32_ARM_KUSER_HELPER_ADDR
     50  1.1       ryo static int
     51  1.1       ryo vmcmd_linux32_kuser_helper_map(struct lwp *l, struct exec_vmcmd *cmd)
     52  1.1       ryo {
     53  1.1       ryo 	const struct proc *p = l->l_proc;
     54  1.1       ryo 	/* l->l_proc->p_emul still points to emul_netbsd at this point */
     55  1.1       ryo 	const struct emul *e = &emul_linux32;
     56  1.1       ryo 	struct uvm_object *uobj;
     57  1.1       ryo 	vsize_t sz;
     58  1.1       ryo 	vaddr_t va;
     59  1.1       ryo 	int error;
     60  1.1       ryo 
     61  1.1       ryo 	/*
     62  1.1       ryo 	 * kuser_helper code share the page prepared for sigcode.
     63  1.1       ryo 	 * See also sys/compat/linux32/arch/aarch64/linux32_sigcode.S
     64  1.1       ryo 	 */
     65  1.1       ryo 	if (e->e_sigobject == NULL)
     66  1.1       ryo 		return 0;
     67  1.1       ryo 	uobj = *e->e_sigobject;
     68  1.1       ryo 	if (uobj == NULL)
     69  1.1       ryo 		return 0;
     70  1.1       ryo 
     71  1.1       ryo 	va = LINUX32_ARM_KUSER_HELPER_ADDR;
     72  1.1       ryo 	sz = LINUX32_ARM_KUSER_HELPER_SIZE;
     73  1.1       ryo 
     74  1.1       ryo 	(*uobj->pgops->pgo_reference)(uobj);
     75  1.1       ryo 	error = uvm_map(&p->p_vmspace->vm_map, &va, round_page(sz), uobj, 0, 0,
     76  1.1       ryo 	    UVM_MAPFLAG(UVM_PROT_RX, UVM_PROT_RX,
     77  1.1       ryo 	    UVM_INH_SHARE, UVM_ADV_RANDOM, 0));
     78  1.1       ryo 	if (error) {
     79  1.1       ryo 		(*uobj->pgops->pgo_detach)(uobj);
     80  1.1       ryo 		return error;
     81  1.1       ryo 	}
     82  1.1       ryo 
     83  1.1       ryo 	return 0;
     84  1.1       ryo }
     85  1.1       ryo #endif
     86  1.1       ryo 
     87  1.1       ryo int
     88  1.1       ryo linux32_exec_setup_stack(struct lwp *l, struct exec_package *epp)
     89  1.1       ryo {
     90  1.1       ryo 	vaddr_t access_linear_min, noaccess_linear_min;
     91  1.1       ryo 	vsize_t access_size, noaccess_size;
     92  1.1       ryo 	vsize_t max_stack_size;
     93  1.1       ryo 
     94  1.1       ryo #ifndef LINUX32_USRSTACK
     95  1.1       ryo #define LINUX32_USRSTACK	USRSTACK32
     96  1.1       ryo #endif
     97  1.1       ryo #ifndef LINUX32_MAXSSIZ
     98  1.1       ryo #define LINUX32_MAXSSIZ		MAXSSIZ32
     99  1.1       ryo #endif
    100  1.1       ryo 
    101  1.1       ryo 	KASSERT((epp->ep_flags & EXEC_32) != 0);
    102  1.1       ryo 	epp->ep_minsaddr = LINUX32_USRSTACK;
    103  1.1       ryo 	max_stack_size = LINUX32_MAXSSIZ;
    104  1.1       ryo 
    105  1.1       ryo 	epp->ep_ssize =
    106  1.1       ryo 	    MIN(l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur, max_stack_size);
    107  1.1       ryo 	epp->ep_maxsaddr =
    108  1.1       ryo 	    (vaddr_t)STACK_GROW(epp->ep_minsaddr, max_stack_size);
    109  1.1       ryo 
    110  1.1       ryo 	l->l_proc->p_stackbase = epp->ep_minsaddr;
    111  1.1       ryo 
    112  1.1       ryo 	/*
    113  1.1       ryo 	 * set up commands for stack.  note that this takes *two*, one to
    114  1.1       ryo 	 * map the part of the stack which we can access, and one to map
    115  1.1       ryo 	 * the part which we can't.
    116  1.1       ryo 	 *
    117  1.1       ryo 	 * arguably, it could be made into one, but that would require the
    118  1.1       ryo 	 * addition of another mapping proc, which is unnecessary
    119  1.1       ryo 	 */
    120  1.1       ryo 	access_size = epp->ep_ssize;
    121  1.1       ryo 	access_linear_min = (vaddr_t)STACK_ALLOC(epp->ep_minsaddr, access_size);
    122  1.1       ryo 	noaccess_size = max_stack_size - access_size;
    123  1.1       ryo 	noaccess_linear_min = (vaddr_t)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr,
    124  1.1       ryo 	    access_size), noaccess_size);
    125  1.1       ryo 
    126  1.1       ryo 	if (noaccess_size > 0 && noaccess_size <= max_stack_size) {
    127  1.1       ryo 		NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
    128  1.1       ryo 		    noaccess_linear_min, NULLVP, 0, VM_PROT_NONE, VMCMD_STACK);
    129  1.1       ryo 	}
    130  1.2  riastrad 	KASSERT(access_size > 0);
    131  1.2  riastrad 	KASSERT(access_size <= max_stack_size);
    132  1.1       ryo 	NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, access_size,
    133  1.1       ryo 	    access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE,
    134  1.1       ryo 	    VMCMD_STACK);
    135  1.1       ryo 
    136  1.1       ryo #ifdef LINUX32_ARM_KUSER_HELPER_ADDR
    137  1.1       ryo 	NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_linux32_kuser_helper_map,
    138  1.1       ryo 	    LINUX32_ARM_KUSER_HELPER_SIZE, LINUX32_ARM_KUSER_HELPER_ADDR,
    139  1.1       ryo 	    NULLVP, 0, VM_PROT_READ | VM_PROT_EXECUTE, 0);
    140  1.1       ryo #endif /* LINUX32_ARM_KUSER_HELPER_ADDR */
    141  1.1       ryo 
    142  1.1       ryo 	return 0;
    143  1.1       ryo }
    144