xref: /freebsd/sys/compat/linux/linux_mmap.c (revision 52c81be11a107cdedb865a274b5567b0c95c0308)
197d06da6SDmitry Chagin /*-
297d06da6SDmitry Chagin  * Copyright (c) 2004 Tim J. Robbins
397d06da6SDmitry Chagin  * Copyright (c) 2002 Doug Rabson
497d06da6SDmitry Chagin  * Copyright (c) 2000 Marcel Moolenaar
597d06da6SDmitry Chagin  * Copyright (c) 1994-1995 Søren Schmidt
697d06da6SDmitry Chagin  * All rights reserved.
797d06da6SDmitry Chagin  *
897d06da6SDmitry Chagin  * Redistribution and use in source and binary forms, with or without
997d06da6SDmitry Chagin  * modification, are permitted provided that the following conditions
1097d06da6SDmitry Chagin  * are met:
1197d06da6SDmitry Chagin  * 1. Redistributions of source code must retain the above copyright
1297d06da6SDmitry Chagin  *    notice, this list of conditions and the following disclaimer
1397d06da6SDmitry Chagin  *    in this position and unchanged.
1497d06da6SDmitry Chagin  * 2. Redistributions in binary form must reproduce the above copyright
1597d06da6SDmitry Chagin  *    notice, this list of conditions and the following disclaimer in the
1697d06da6SDmitry Chagin  *    documentation and/or other materials provided with the distribution.
1797d06da6SDmitry Chagin  * 3. The name of the author may not be used to endorse or promote products
1897d06da6SDmitry Chagin  *    derived from this software without specific prior written permission.
1997d06da6SDmitry Chagin  *
2097d06da6SDmitry Chagin  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
2197d06da6SDmitry Chagin  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
2297d06da6SDmitry Chagin  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
2397d06da6SDmitry Chagin  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
2497d06da6SDmitry Chagin  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
2597d06da6SDmitry Chagin  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2697d06da6SDmitry Chagin  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
2797d06da6SDmitry Chagin  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
2897d06da6SDmitry Chagin  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
2997d06da6SDmitry Chagin  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
3097d06da6SDmitry Chagin  *
3197d06da6SDmitry Chagin  * $FreeBSD$
3297d06da6SDmitry Chagin  */
3397d06da6SDmitry Chagin 
3497d06da6SDmitry Chagin #include <sys/cdefs.h>
3597d06da6SDmitry Chagin __FBSDID("$FreeBSD$");
3697d06da6SDmitry Chagin 
3797d06da6SDmitry Chagin #include <sys/capsicum.h>
3897d06da6SDmitry Chagin #include <sys/file.h>
3997d06da6SDmitry Chagin #include <sys/imgact.h>
4097d06da6SDmitry Chagin #include <sys/ktr.h>
4197d06da6SDmitry Chagin #include <sys/mman.h>
4297d06da6SDmitry Chagin #include <sys/proc.h>
4397d06da6SDmitry Chagin #include <sys/resourcevar.h>
44496ab053SKonstantin Belousov #include <sys/syscallsubr.h>
4597d06da6SDmitry Chagin #include <sys/sysent.h>
4697d06da6SDmitry Chagin #include <sys/sysproto.h>
4797d06da6SDmitry Chagin 
4897d06da6SDmitry Chagin #include <vm/pmap.h>
4969cdfcefSEdward Tomasz Napierala #include <vm/vm_extern.h>
5097d06da6SDmitry Chagin #include <vm/vm_map.h>
5197d06da6SDmitry Chagin 
5297d06da6SDmitry Chagin #include <compat/linux/linux_emul.h>
5397d06da6SDmitry Chagin #include <compat/linux/linux_mmap.h>
5497d06da6SDmitry Chagin #include <compat/linux/linux_persona.h>
5597d06da6SDmitry Chagin #include <compat/linux/linux_util.h>
5697d06da6SDmitry Chagin 
5797d06da6SDmitry Chagin 
5897d06da6SDmitry Chagin #define STACK_SIZE  (2 * 1024 * 1024)
5997d06da6SDmitry Chagin #define GUARD_SIZE  (4 * PAGE_SIZE)
6097d06da6SDmitry Chagin 
6197d06da6SDmitry Chagin #if defined(__amd64__)
6297d06da6SDmitry Chagin static void linux_fixup_prot(struct thread *td, int *prot);
6397d06da6SDmitry Chagin #endif
6497d06da6SDmitry Chagin 
6518348a23SKyle Evans static int
6618348a23SKyle Evans linux_mmap_check_fp(struct file *fp, int flags, int prot, int maxprot)
6718348a23SKyle Evans {
6818348a23SKyle Evans 
6918348a23SKyle Evans 	/* Linux mmap() just fails for O_WRONLY files */
7018348a23SKyle Evans 	if ((fp->f_flag & FREAD) == 0)
7118348a23SKyle Evans 		return (EACCES);
7218348a23SKyle Evans 
7318348a23SKyle Evans 	return (0);
7418348a23SKyle Evans }
7597d06da6SDmitry Chagin 
7697d06da6SDmitry Chagin int
7797d06da6SDmitry Chagin linux_mmap_common(struct thread *td, uintptr_t addr, size_t len, int prot,
7897d06da6SDmitry Chagin     int flags, int fd, off_t pos)
7997d06da6SDmitry Chagin {
80d718de81SBrooks Davis 	struct mmap_req mr, mr_fixed;
8197d06da6SDmitry Chagin 	struct proc *p = td->td_proc;
8297d06da6SDmitry Chagin 	struct vmspace *vms = td->td_proc->p_vmspace;
8369cdfcefSEdward Tomasz Napierala 	int bsd_flags, error;
8497d06da6SDmitry Chagin 	struct file *fp;
8597d06da6SDmitry Chagin 
8697d06da6SDmitry Chagin 	LINUX_CTR6(mmap2, "0x%lx, %ld, %ld, 0x%08lx, %ld, 0x%lx",
8797d06da6SDmitry Chagin 	    addr, len, prot, flags, fd, pos);
8897d06da6SDmitry Chagin 
8997d06da6SDmitry Chagin 	error = 0;
9069cdfcefSEdward Tomasz Napierala 	bsd_flags = 0;
9197d06da6SDmitry Chagin 	fp = NULL;
9297d06da6SDmitry Chagin 
9397d06da6SDmitry Chagin 	/*
9497d06da6SDmitry Chagin 	 * Linux mmap(2):
9597d06da6SDmitry Chagin 	 * You must specify exactly one of MAP_SHARED and MAP_PRIVATE
9697d06da6SDmitry Chagin 	 */
9797d06da6SDmitry Chagin 	if (!((flags & LINUX_MAP_SHARED) ^ (flags & LINUX_MAP_PRIVATE)))
9897d06da6SDmitry Chagin 		return (EINVAL);
9997d06da6SDmitry Chagin 
10097d06da6SDmitry Chagin 	if (flags & LINUX_MAP_SHARED)
10169cdfcefSEdward Tomasz Napierala 		bsd_flags |= MAP_SHARED;
10297d06da6SDmitry Chagin 	if (flags & LINUX_MAP_PRIVATE)
10369cdfcefSEdward Tomasz Napierala 		bsd_flags |= MAP_PRIVATE;
10497d06da6SDmitry Chagin 	if (flags & LINUX_MAP_FIXED)
10569cdfcefSEdward Tomasz Napierala 		bsd_flags |= MAP_FIXED;
10697d06da6SDmitry Chagin 	if (flags & LINUX_MAP_ANON) {
10797d06da6SDmitry Chagin 		/* Enforce pos to be on page boundary, then ignore. */
10897d06da6SDmitry Chagin 		if ((pos & PAGE_MASK) != 0)
10997d06da6SDmitry Chagin 			return (EINVAL);
11097d06da6SDmitry Chagin 		pos = 0;
11169cdfcefSEdward Tomasz Napierala 		bsd_flags |= MAP_ANON;
11297d06da6SDmitry Chagin 	} else
11369cdfcefSEdward Tomasz Napierala 		bsd_flags |= MAP_NOSYNC;
11497d06da6SDmitry Chagin 	if (flags & LINUX_MAP_GROWSDOWN)
11569cdfcefSEdward Tomasz Napierala 		bsd_flags |= MAP_STACK;
11697d06da6SDmitry Chagin 
117618b55c2SEdward Tomasz Napierala #if defined(__amd64__)
118618b55c2SEdward Tomasz Napierala 	/*
119618b55c2SEdward Tomasz Napierala 	 * According to the Linux mmap(2) man page, "MAP_32BIT flag
120618b55c2SEdward Tomasz Napierala 	 * is ignored when MAP_FIXED is set."
121618b55c2SEdward Tomasz Napierala 	 */
122618b55c2SEdward Tomasz Napierala 	if ((flags & LINUX_MAP_32BIT) && (flags & LINUX_MAP_FIXED) == 0)
123618b55c2SEdward Tomasz Napierala 		bsd_flags |= MAP_32BIT;
124618b55c2SEdward Tomasz Napierala 
12597d06da6SDmitry Chagin 	/*
12697d06da6SDmitry Chagin 	 * PROT_READ, PROT_WRITE, or PROT_EXEC implies PROT_READ and PROT_EXEC
12797d06da6SDmitry Chagin 	 * on Linux/i386 if the binary requires executable stack.
12897d06da6SDmitry Chagin 	 * We do this only for IA32 emulation as on native i386 this is does not
12997d06da6SDmitry Chagin 	 * make sense without PAE.
13097d06da6SDmitry Chagin 	 *
13197d06da6SDmitry Chagin 	 * XXX. Linux checks that the file system is not mounted with noexec.
13297d06da6SDmitry Chagin 	 */
13369cdfcefSEdward Tomasz Napierala 	linux_fixup_prot(td, &prot);
13497d06da6SDmitry Chagin #endif
13597d06da6SDmitry Chagin 
13697d06da6SDmitry Chagin 	/* Linux does not check file descriptor when MAP_ANONYMOUS is set. */
13769cdfcefSEdward Tomasz Napierala 	fd = (bsd_flags & MAP_ANON) ? -1 : fd;
13897d06da6SDmitry Chagin 	if (flags & LINUX_MAP_GROWSDOWN) {
13997d06da6SDmitry Chagin 		/*
14097d06da6SDmitry Chagin 		 * The Linux MAP_GROWSDOWN option does not limit auto
14197d06da6SDmitry Chagin 		 * growth of the region.  Linux mmap with this option
14297d06da6SDmitry Chagin 		 * takes as addr the initial BOS, and as len, the initial
14397d06da6SDmitry Chagin 		 * region size.  It can then grow down from addr without
14497d06da6SDmitry Chagin 		 * limit.  However, Linux threads has an implicit internal
14597d06da6SDmitry Chagin 		 * limit to stack size of STACK_SIZE.  Its just not
14697d06da6SDmitry Chagin 		 * enforced explicitly in Linux.  But, here we impose
14797d06da6SDmitry Chagin 		 * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
14897d06da6SDmitry Chagin 		 * region, since we can do this with our mmap.
14997d06da6SDmitry Chagin 		 *
15097d06da6SDmitry Chagin 		 * Our mmap with MAP_STACK takes addr as the maximum
15197d06da6SDmitry Chagin 		 * downsize limit on BOS, and as len the max size of
15297d06da6SDmitry Chagin 		 * the region.  It then maps the top SGROWSIZ bytes,
15397d06da6SDmitry Chagin 		 * and auto grows the region down, up to the limit
15497d06da6SDmitry Chagin 		 * in addr.
15597d06da6SDmitry Chagin 		 *
15697d06da6SDmitry Chagin 		 * If we don't use the MAP_STACK option, the effect
15797d06da6SDmitry Chagin 		 * of this code is to allocate a stack region of a
15897d06da6SDmitry Chagin 		 * fixed size of (STACK_SIZE - GUARD_SIZE).
15997d06da6SDmitry Chagin 		 */
16097d06da6SDmitry Chagin 
16197d06da6SDmitry Chagin 		if ((caddr_t)addr + len > vms->vm_maxsaddr) {
16297d06da6SDmitry Chagin 			/*
16397d06da6SDmitry Chagin 			 * Some Linux apps will attempt to mmap
16497d06da6SDmitry Chagin 			 * thread stacks near the top of their
16597d06da6SDmitry Chagin 			 * address space.  If their TOS is greater
16697d06da6SDmitry Chagin 			 * than vm_maxsaddr, vm_map_growstack()
16797d06da6SDmitry Chagin 			 * will confuse the thread stack with the
16897d06da6SDmitry Chagin 			 * process stack and deliver a SEGV if they
16997d06da6SDmitry Chagin 			 * attempt to grow the thread stack past their
17097d06da6SDmitry Chagin 			 * current stacksize rlimit.  To avoid this,
17197d06da6SDmitry Chagin 			 * adjust vm_maxsaddr upwards to reflect
17297d06da6SDmitry Chagin 			 * the current stacksize rlimit rather
17397d06da6SDmitry Chagin 			 * than the maximum possible stacksize.
17497d06da6SDmitry Chagin 			 * It would be better to adjust the
17597d06da6SDmitry Chagin 			 * mmap'ed region, but some apps do not check
17697d06da6SDmitry Chagin 			 * mmap's return value.
17797d06da6SDmitry Chagin 			 */
17897d06da6SDmitry Chagin 			PROC_LOCK(p);
17997d06da6SDmitry Chagin 			vms->vm_maxsaddr = (char *)p->p_sysent->sv_usrstack -
18097d06da6SDmitry Chagin 			    lim_cur_proc(p, RLIMIT_STACK);
18197d06da6SDmitry Chagin 			PROC_UNLOCK(p);
18297d06da6SDmitry Chagin 		}
18397d06da6SDmitry Chagin 
18497d06da6SDmitry Chagin 		/*
18597d06da6SDmitry Chagin 		 * This gives us our maximum stack size and a new BOS.
18697d06da6SDmitry Chagin 		 * If we're using VM_STACK, then mmap will just map
18797d06da6SDmitry Chagin 		 * the top SGROWSIZ bytes, and let the stack grow down
18897d06da6SDmitry Chagin 		 * to the limit at BOS.  If we're not using VM_STACK
18997d06da6SDmitry Chagin 		 * we map the full stack, since we don't have a way
19097d06da6SDmitry Chagin 		 * to autogrow it.
19197d06da6SDmitry Chagin 		 */
19269cdfcefSEdward Tomasz Napierala 		if (len <= STACK_SIZE - GUARD_SIZE) {
19369cdfcefSEdward Tomasz Napierala 			addr = addr - (STACK_SIZE - GUARD_SIZE - len);
19469cdfcefSEdward Tomasz Napierala 			len = STACK_SIZE - GUARD_SIZE;
19597d06da6SDmitry Chagin 		}
19697d06da6SDmitry Chagin 	}
19797d06da6SDmitry Chagin 
198c6d57d30SEdward Tomasz Napierala 	/*
199c6d57d30SEdward Tomasz Napierala 	 * FreeBSD is free to ignore the address hint if MAP_FIXED wasn't
200c6d57d30SEdward Tomasz Napierala 	 * passed.  However, some Linux applications, like the ART runtime,
201c6d57d30SEdward Tomasz Napierala 	 * depend on the hint.  If the MAP_FIXED wasn't passed, but the
202c6d57d30SEdward Tomasz Napierala 	 * address is not zero, try with MAP_FIXED and MAP_EXCL first,
203c6d57d30SEdward Tomasz Napierala 	 * and fall back to the normal behaviour if that fails.
204c6d57d30SEdward Tomasz Napierala 	 */
205d718de81SBrooks Davis 	mr = (struct mmap_req) {
206d718de81SBrooks Davis 		.mr_hint = addr,
207d718de81SBrooks Davis 		.mr_len = len,
208d718de81SBrooks Davis 		.mr_prot = prot,
209d718de81SBrooks Davis 		.mr_flags = bsd_flags,
210d718de81SBrooks Davis 		.mr_fd = fd,
211d718de81SBrooks Davis 		.mr_pos = pos,
212d718de81SBrooks Davis 		.mr_check_fp_fn = linux_mmap_check_fp,
213d718de81SBrooks Davis 	};
214c6d57d30SEdward Tomasz Napierala 	if (addr != 0 && (bsd_flags & MAP_FIXED) == 0 &&
215c6d57d30SEdward Tomasz Napierala 	    (bsd_flags & MAP_EXCL) == 0) {
216d718de81SBrooks Davis 		mr_fixed = mr;
217d718de81SBrooks Davis 		mr_fixed.mr_flags |= MAP_FIXED | MAP_EXCL;
218d718de81SBrooks Davis 		error = kern_mmap_req(td, &mr_fixed);
219c6d57d30SEdward Tomasz Napierala 		if (error == 0)
220c6d57d30SEdward Tomasz Napierala 			goto out;
221c6d57d30SEdward Tomasz Napierala 	}
22297d06da6SDmitry Chagin 
223d718de81SBrooks Davis 	error = kern_mmap_req(td, &mr);
224c6d57d30SEdward Tomasz Napierala out:
22597d06da6SDmitry Chagin 	LINUX_CTR2(mmap2, "return: %d (%p)", error, td->td_retval[0]);
22697d06da6SDmitry Chagin 
22797d06da6SDmitry Chagin 	return (error);
22897d06da6SDmitry Chagin }
22997d06da6SDmitry Chagin 
23097d06da6SDmitry Chagin int
23197d06da6SDmitry Chagin linux_mprotect_common(struct thread *td, uintptr_t addr, size_t len, int prot)
23297d06da6SDmitry Chagin {
23397d06da6SDmitry Chagin 
234e2fba140STijl Coosemans 	/* XXX Ignore PROT_GROWSDOWN and PROT_GROWSUP for now. */
235e2fba140STijl Coosemans 	prot &= ~(LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP);
236e2fba140STijl Coosemans 	if ((prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0)
237e2fba140STijl Coosemans 		return (EINVAL);
238e2fba140STijl Coosemans 
23997d06da6SDmitry Chagin #if defined(__amd64__)
24069cdfcefSEdward Tomasz Napierala 	linux_fixup_prot(td, &prot);
24197d06da6SDmitry Chagin #endif
242496ab053SKonstantin Belousov 	return (kern_mprotect(td, addr, len, prot));
24397d06da6SDmitry Chagin }
24497d06da6SDmitry Chagin 
245*52c81be1SEdward Tomasz Napierala int
246*52c81be1SEdward Tomasz Napierala linux_madvise_common(struct thread *td, uintptr_t addr, size_t len, int behav)
247*52c81be1SEdward Tomasz Napierala {
248*52c81be1SEdward Tomasz Napierala 
249*52c81be1SEdward Tomasz Napierala 	switch (behav) {
250*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_NORMAL:
251*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_NORMAL));
252*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_RANDOM:
253*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_RANDOM));
254*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_SEQUENTIAL:
255*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_SEQUENTIAL));
256*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_WILLNEED:
257*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_WILLNEED));
258*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_DONTNEED:
259*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_DONTNEED));
260*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_FREE:
261*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_FREE));
262*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_REMOVE:
263*52c81be1SEdward Tomasz Napierala 		linux_msg(curthread, "unsupported madvise MADV_REMOVE");
264*52c81be1SEdward Tomasz Napierala 		return (EINVAL);
265*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_DONTFORK:
266*52c81be1SEdward Tomasz Napierala 		return (kern_minherit(td, addr, len, INHERIT_NONE));
267*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_DOFORK:
268*52c81be1SEdward Tomasz Napierala 		return (kern_minherit(td, addr, len, INHERIT_COPY));
269*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_MERGEABLE:
270*52c81be1SEdward Tomasz Napierala 		linux_msg(curthread, "unsupported madvise MADV_MERGEABLE");
271*52c81be1SEdward Tomasz Napierala 		return (EINVAL);
272*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_UNMERGEABLE:
273*52c81be1SEdward Tomasz Napierala 		/* We don't merge anyway. */
274*52c81be1SEdward Tomasz Napierala 		return (0);
275*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_HUGEPAGE:
276*52c81be1SEdward Tomasz Napierala 		/* Ignored; on FreeBSD huge pages are always on. */
277*52c81be1SEdward Tomasz Napierala 		return (0);
278*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_NOHUGEPAGE:
279*52c81be1SEdward Tomasz Napierala 		linux_msg(curthread, "unsupported madvise MADV_NOHUGEPAGE");
280*52c81be1SEdward Tomasz Napierala 		return (EINVAL);
281*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_DONTDUMP:
282*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_NOCORE));
283*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_DODUMP:
284*52c81be1SEdward Tomasz Napierala 		return (kern_madvise(td, addr, len, MADV_CORE));
285*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_WIPEONFORK:
286*52c81be1SEdward Tomasz Napierala 		return (kern_minherit(td, addr, len, INHERIT_ZERO));
287*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_KEEPONFORK:
288*52c81be1SEdward Tomasz Napierala 		return (kern_minherit(td, addr, len, INHERIT_COPY));
289*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_HWPOISON:
290*52c81be1SEdward Tomasz Napierala 		linux_msg(curthread, "unsupported madvise MADV_HWPOISON");
291*52c81be1SEdward Tomasz Napierala 		return (EINVAL);
292*52c81be1SEdward Tomasz Napierala 	case LINUX_MADV_SOFT_OFFLINE:
293*52c81be1SEdward Tomasz Napierala 		linux_msg(curthread, "unsupported madvise MADV_SOFT_OFFLINE");
294*52c81be1SEdward Tomasz Napierala 		return (EINVAL);
295*52c81be1SEdward Tomasz Napierala 	default:
296*52c81be1SEdward Tomasz Napierala 		linux_msg(curthread, "unsupported madvise behav %d", behav);
297*52c81be1SEdward Tomasz Napierala 		return (EINVAL);
298*52c81be1SEdward Tomasz Napierala 	}
299*52c81be1SEdward Tomasz Napierala }
300*52c81be1SEdward Tomasz Napierala 
30197d06da6SDmitry Chagin #if defined(__amd64__)
30297d06da6SDmitry Chagin static void
30397d06da6SDmitry Chagin linux_fixup_prot(struct thread *td, int *prot)
30497d06da6SDmitry Chagin {
30597d06da6SDmitry Chagin 	struct linux_pemuldata *pem;
30697d06da6SDmitry Chagin 
30797d06da6SDmitry Chagin 	if (SV_PROC_FLAG(td->td_proc, SV_ILP32) && *prot & PROT_READ) {
30897d06da6SDmitry Chagin 		pem = pem_find(td->td_proc);
30997d06da6SDmitry Chagin 		if (pem->persona & LINUX_READ_IMPLIES_EXEC)
31097d06da6SDmitry Chagin 			*prot |= PROT_EXEC;
31197d06da6SDmitry Chagin 	}
31297d06da6SDmitry Chagin 
31397d06da6SDmitry Chagin }
31497d06da6SDmitry Chagin #endif
315