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      1 /*	$NetBSD: netbsd32_vm.c,v 1.3 2021/01/19 01:47:58 simonb Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998, 2001, 2008, 2018 Matthew R. Green
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * from: NetBSD: netbsd32_netbsd.c,v 1.221 2018/12/24 20:44:39 mrg Exp
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_vm.c,v 1.3 2021/01/19 01:47:58 simonb Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/mman.h>
     37 #include <sys/filedesc.h>
     38 #include <sys/vfs_syscalls.h>
     39 
     40 #include <compat/sys/mman.h>
     41 #include <compat/netbsd32/netbsd32.h>
     42 #include <compat/netbsd32/netbsd32_syscall.h>
     43 #include <compat/netbsd32/netbsd32_syscallargs.h>
     44 #include <compat/netbsd32/netbsd32_conv.h>
     45 
     46 
     47 int
     48 netbsd32_mmap(struct lwp *l, const struct netbsd32_mmap_args *uap, register_t *retval)
     49 {
     50 	/* {
     51 		syscallarg(netbsd32_voidp) addr;
     52 		syscallarg(netbsd32_size_t) len;
     53 		syscallarg(int) prot;
     54 		syscallarg(int) flags;
     55 		syscallarg(int) fd;
     56 		syscallarg(netbsd32_long) PAD;
     57 		syscallarg(netbsd32_off_t) pos;
     58 	} */
     59 	struct sys_mmap_args ua;
     60 	int error;
     61 
     62 	NETBSD32TOP_UAP(addr, void);
     63 	NETBSD32TOX_UAP(len, size_t);
     64 	NETBSD32TO64_UAP(prot);
     65 	NETBSD32TO64_UAP(flags);
     66 #ifdef __x86_64__
     67 	/*
     68 	 * Ancient kernel on x86 did not obey PROT_EXEC on i386 at least
     69 	 * and ld.so did not turn it on!
     70 	 */
     71 	if (SCARG(&ua, flags) & COMPAT_MAP_COPY) {
     72 		SCARG(&ua, flags) = MAP_PRIVATE
     73 		    | (SCARG(&ua, flags) & ~COMPAT_MAP_COPY);
     74 		SCARG(&ua, prot) |= PROT_EXEC;
     75 	}
     76 #endif
     77 	NETBSD32TO64_UAP(fd);
     78 	NETBSD32TOX_UAP(PAD, long);
     79 	NETBSD32TOX_UAP(pos, off_t);
     80 #ifdef DEBUG_MMAP
     81 	printf("mmap(addr=0x%lx, len=0x%lx, prot=0x%lx, flags=0x%lx, "
     82 	    "fd=%ld, pos=0x%lx);\n",
     83 	    (long)SCARG(&ua, addr), (long)SCARG(&ua, len),
     84 	    (long)SCARG(&ua, prot), (long)SCARG(&ua, flags),
     85 	    (long)SCARG(&ua, fd), (long)SCARG(&ua, pos));
     86 #endif
     87 
     88 	error = sys_mmap(l, &ua, retval);
     89 #ifdef DEBUG_MMAP
     90 	printf("mmap error = %d  *retval = %#"PRIxREGISTER"\n", error, *retval);
     91 #endif
     92 	if (error == 0 && (u_long)*retval > (u_long)UINT_MAX) {
     93 		const char *name = curlwp->l_name;
     94 
     95 		if (name == NULL)
     96 			name = curproc->p_comm;
     97 		printf("netbsd32_mmap(%s:%u:%u): retval out of range: 0x%lx\n",
     98 		    name, curproc->p_pid, curlwp->l_lid, (u_long)*retval);
     99 		/* Should try to recover and return an error here. */
    100 	}
    101 	return error;
    102 }
    103