mem.c - platform/external/strace.git - Git at Google

 /*
  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
  * Copyright (c) 2000 PocketPenguins Inc.  Linux for Hitachi SuperH
  *                    port by Greg Banks <gbanks@pocketpenguins.com>
  * Copyright (c) 1999-2018 The strace developers.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "defs.h"
 #include <linux/mman.h>
 #include <sys/mman.h>

 unsigned long
 get_pagesize(void)
 {
 	static unsigned long pagesize;

 	if (!pagesize) {
 		long ret = sysconf(_SC_PAGESIZE);

 		if (ret < 0)
 			perror_func_msg_and_die("sysconf(_SC_PAGESIZE)");
 		if (ret == 0)
 			error_func_msg_and_die("sysconf(_SC_PAGESIZE) "
 					       "returned 0");

 		pagesize = (unsigned long) ret;
 	}

 	return pagesize;
 }

 SYS_FUNC(brk)
 {
 	printaddr(tcp->u_arg[0]);

 	return RVAL_DECODED | RVAL_HEX;
 }

 #include "xlat/mmap_prot.h"
 #include "xlat/mmap_flags.h"

 #ifndef MAP_HUGE_SHIFT
 # define MAP_HUGE_SHIFT 26
 #endif

 #ifndef MAP_HUGE_MASK
 # define MAP_HUGE_MASK 0x3f
 #endif

 static void
 print_mmap_flags(kernel_ulong_t flags)
 {
 	printxval64(mmap_flags, flags & MAP_TYPE, "MAP_???");
 	flags &= ~MAP_TYPE;

 	const unsigned int mask = MAP_HUGE_MASK << MAP_HUGE_SHIFT;
 	const unsigned int hugetlb_value = flags & mask;

 	flags &= ~mask;
 	if (flags) {
 		tprints("|");
 		printflags64(mmap_flags, flags, NULL);
 	}

 	if (hugetlb_value)
 		tprintf("|%u<<MAP_HUGE_SHIFT",
 			hugetlb_value >> MAP_HUGE_SHIFT);
 }

 static void
 print_mmap(struct tcb *tcp, kernel_ulong_t *u_arg, unsigned long long offset)
 {
 	const kernel_ulong_t addr = u_arg[0];
 	const kernel_ulong_t len = u_arg[1];
 	const kernel_ulong_t prot = u_arg[2];
 	const kernel_ulong_t flags = u_arg[3];
 	const int fd = u_arg[4];

 	printaddr(addr);
 	tprintf(", %" PRI_klu ", ", len);
 	printflags64(mmap_prot, prot, "PROT_???");
 	tprints(", ");
 	print_mmap_flags(flags);
 	tprints(", ");
 	printfd(tcp, fd);
 	tprintf(", %#llx", offset);
 }

 /* Syscall name<->function correspondence is messed up on many arches.
  * For example:
  * i386 has __NR_mmap == 90, and it is "old mmap", and
  * also it has __NR_mmap2 == 192, which is a "new mmap with page offsets".
  * But x86_64 has just one __NR_mmap == 9, a "new mmap with byte offsets".
  * Confused? Me too!
  */

 #if HAVE_ARCH_OLD_MMAP
 /* Params are pointed to by u_arg[0], offset is in bytes */
 SYS_FUNC(old_mmap)
 {
 	kernel_ulong_t *args =
 		fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);

 	if (args)
 		print_mmap(tcp, args, args[5]);
 	else
 		printaddr(tcp->u_arg[0]);

 	return RVAL_DECODED | RVAL_HEX;
 }

 # if HAVE_ARCH_OLD_MMAP_PGOFF
 /* Params are pointed to by u_arg[0], offset is in pages */
 SYS_FUNC(old_mmap_pgoff)
 {
 	kernel_ulong_t *args =
 		fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);

 	if (args) {
 		unsigned long long offset;

 		offset = args[5];
 		offset *= get_pagesize();

 		print_mmap(tcp, args, offset);
 	} else {
 		printaddr(tcp->u_arg[0]);
 	}

 	return RVAL_DECODED | RVAL_HEX;
 }
 # endif /* HAVE_ARCH_OLD_MMAP_PGOFF */
 #endif /* HAVE_ARCH_OLD_MMAP */

 /* Params are passed directly, offset is in bytes */
 SYS_FUNC(mmap)
 {
 	/* Example of kernel-side handling of this variety of mmap:
 	 * arch/x86/kernel/sys_x86_64.c::SYSCALL_DEFINE6(mmap, ...) calls
 	 * sys_mmap_pgoff(..., off >> PAGE_SHIFT); i.e. off is in bytes,
 	 * since the above code converts off to pages.
 	 */
 	print_mmap(tcp, tcp->u_arg, tcp->u_arg[5]);

 	return RVAL_DECODED | RVAL_HEX;
 }

 /* Params are passed directly, offset is in pages */
 SYS_FUNC(mmap_pgoff)
 {
 	/* Try test/mmap_offset_decode.c */
 	unsigned long long offset;
 	offset = tcp->u_arg[5];
 	offset *= get_pagesize();
 	print_mmap(tcp, tcp->u_arg, offset);

 	return RVAL_DECODED | RVAL_HEX;
 }

 /* Params are passed directly, offset is in 4k units */
 SYS_FUNC(mmap_4koff)
 {
 	unsigned long long offset;
 	offset = tcp->u_arg[5];
 	offset <<= 12;
 	print_mmap(tcp, tcp->u_arg, offset);

 	return RVAL_DECODED | RVAL_HEX;
 }

 SYS_FUNC(munmap)
 {
 	printaddr(tcp->u_arg[0]);
 	tprintf(", %" PRI_klu, tcp->u_arg[1]);

 	return RVAL_DECODED;
 }

 static int
 do_mprotect(struct tcb *tcp, bool has_pkey)
 {
 	printaddr(tcp->u_arg[0]);
 	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 	printflags64(mmap_prot, tcp->u_arg[2], "PROT_???");

 	if (has_pkey)
 		tprintf(", %d", (int) tcp->u_arg[3]);

 	return RVAL_DECODED;
 }

 SYS_FUNC(mprotect)
 {
 	return do_mprotect(tcp, false);
 }

 SYS_FUNC(pkey_mprotect)
 {
 	return do_mprotect(tcp, true);
 }

 #include "xlat/mremap_flags.h"

 SYS_FUNC(mremap)
 {
 	printaddr(tcp->u_arg[0]);
 	tprintf(", %" PRI_klu ", %" PRI_klu ", ", tcp->u_arg[1], tcp->u_arg[2]);
 	printflags64(mremap_flags, tcp->u_arg[3], "MREMAP_???");
 #ifdef MREMAP_FIXED
 	if ((tcp->u_arg[3] & (MREMAP_MAYMOVE | MREMAP_FIXED)) ==
 	    (MREMAP_MAYMOVE | MREMAP_FIXED)) {
 		tprints(", ");
 		printaddr(tcp->u_arg[4]);
 	}
 #endif
 	return RVAL_DECODED | RVAL_HEX;
 }

 #include "xlat/madvise_cmds.h"

 SYS_FUNC(madvise)
 {
 	printaddr(tcp->u_arg[0]);
 	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 	printxval(madvise_cmds, tcp->u_arg[2], "MADV_???");

 	return RVAL_DECODED;
 }

 #include "xlat/mlockall_flags.h"

 SYS_FUNC(mlockall)
 {
 	printflags(mlockall_flags, tcp->u_arg[0], "MCL_???");

 	return RVAL_DECODED;
 }

 #include "xlat/mctl_sync.h"

 SYS_FUNC(msync)
 {
 	/* addr */
 	printaddr(tcp->u_arg[0]);
 	/* len */
 	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 	/* flags */
 	printflags(mctl_sync, tcp->u_arg[2], "MS_???");

 	return RVAL_DECODED;
 }

 #include "xlat/mlock_flags.h"

 SYS_FUNC(mlock2)
 {
 	printaddr(tcp->u_arg[0]);
 	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 	printflags(mlock_flags, tcp->u_arg[2], "MLOCK_???");

 	return RVAL_DECODED;
 }

 SYS_FUNC(mincore)
 {
 	if (entering(tcp)) {
 		printaddr(tcp->u_arg[0]);
 		tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
 	} else {
 		const unsigned long page_size = get_pagesize();
 		const unsigned long page_mask = page_size - 1;
 		unsigned long len = tcp->u_arg[1];
 		unsigned char *vec = NULL;

 		len = len / page_size + (len & page_mask ? 1 : 0);
 		if (syserror(tcp) || !verbose(tcp) ||
 		    !tcp->u_arg[2] || !(vec = malloc(len)) ||
 		    umoven(tcp, tcp->u_arg[2], len, vec) < 0)
 			printaddr(tcp->u_arg[2]);
 		else {
 			unsigned long i;
 			tprints("[");
 			for (i = 0; i < len; i++) {
 				if (i)
 					tprints(", ");
 				if (abbrev(tcp) && i >= max_strlen) {
 					tprints("...");
 					break;
 				}
 				tprints((vec[i] & 1) ? "1" : "0");
 			}
 			tprints("]");
 		}
 		free(vec);
 	}
 	return 0;
 }

 SYS_FUNC(remap_file_pages)
 {
 	const kernel_ulong_t addr = tcp->u_arg[0];
 	const kernel_ulong_t size = tcp->u_arg[1];
 	const kernel_ulong_t prot = tcp->u_arg[2];
 	const kernel_ulong_t pgoff = tcp->u_arg[3];
 	const kernel_ulong_t flags = tcp->u_arg[4];

 	printaddr(addr);
 	tprintf(", %" PRI_klu ", ", size);
 	printflags64(mmap_prot, prot, "PROT_???");
 	tprintf(", %" PRI_klu ", ", pgoff);
 	print_mmap_flags(flags);

 	return RVAL_DECODED;
 }

 #if defined(POWERPC)
 static bool
 print_protmap_entry(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 {
 	tprintf("%#08x", *(unsigned int *) elem_buf);

 	return true;
 }

 SYS_FUNC(subpage_prot)
 {
 	kernel_ulong_t addr = tcp->u_arg[0];
 	kernel_ulong_t len = tcp->u_arg[1];
 	kernel_ulong_t nmemb = len >> 16;
 	kernel_ulong_t map = tcp->u_arg[2];

 	printaddr(addr);
 	tprintf(", %" PRI_klu ", ", len);

 	unsigned int entry;
 	print_array(tcp, map, nmemb, &entry, sizeof(entry),
 		    tfetch_mem, print_protmap_entry, 0);

 	return RVAL_DECODED;
 }
 #endif
	/*
	* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
	* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
	* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
	* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
	* Copyright (c) 2000 PocketPenguins Inc. Linux for Hitachi SuperH
	* port by Greg Banks <gbanks@pocketpenguins.com>
	* Copyright (c) 1999-2018 The strace developers.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "defs.h"
	#include <linux/mman.h>
	#include <sys/mman.h>

	unsigned long
	get_pagesize(void)
	{
	static unsigned long pagesize;

	if (!pagesize) {
	long ret = sysconf(_SC_PAGESIZE);

	if (ret < 0)
	perror_func_msg_and_die("sysconf(_SC_PAGESIZE)");
	if (ret == 0)
	error_func_msg_and_die("sysconf(_SC_PAGESIZE) "
	"returned 0");

	pagesize = (unsigned long) ret;
	}

	return pagesize;
	}

	SYS_FUNC(brk)
	{
	printaddr(tcp->u_arg[0]);

	return RVAL_DECODED \| RVAL_HEX;
	}

	#include "xlat/mmap_prot.h"
	#include "xlat/mmap_flags.h"

	#ifndef MAP_HUGE_SHIFT
	# define MAP_HUGE_SHIFT 26
	#endif

	#ifndef MAP_HUGE_MASK
	# define MAP_HUGE_MASK 0x3f
	#endif

	static void
	print_mmap_flags(kernel_ulong_t flags)
	{
	printxval64(mmap_flags, flags & MAP_TYPE, "MAP_???");
	flags &= ~MAP_TYPE;

	const unsigned int mask = MAP_HUGE_MASK << MAP_HUGE_SHIFT;
	const unsigned int hugetlb_value = flags & mask;

	flags &= ~mask;
	if (flags) {
	tprints("\|");
	printflags64(mmap_flags, flags, NULL);
	}

	if (hugetlb_value)
	tprintf("\|%u<<MAP_HUGE_SHIFT",
	hugetlb_value >> MAP_HUGE_SHIFT);
	}

	static void
	print_mmap(struct tcb tcp, kernel_ulong_t u_arg, unsigned long long offset)
	{
	const kernel_ulong_t addr = u_arg[0];
	const kernel_ulong_t len = u_arg[1];
	const kernel_ulong_t prot = u_arg[2];
	const kernel_ulong_t flags = u_arg[3];
	const int fd = u_arg[4];

	printaddr(addr);
	tprintf(", %" PRI_klu ", ", len);
	printflags64(mmap_prot, prot, "PROT_???");
	tprints(", ");
	print_mmap_flags(flags);
	tprints(", ");
	printfd(tcp, fd);
	tprintf(", %#llx", offset);
	}

	/* Syscall name<->function correspondence is messed up on many arches.
	* For example:
	* i386 has __NR_mmap == 90, and it is "old mmap", and
	* also it has __NR_mmap2 == 192, which is a "new mmap with page offsets".
	* But x86_64 has just one __NR_mmap == 9, a "new mmap with byte offsets".
	* Confused? Me too!
	*/

	#if HAVE_ARCH_OLD_MMAP
	/* Params are pointed to by u_arg[0], offset is in bytes */
	SYS_FUNC(old_mmap)
	{
	kernel_ulong_t *args =
	fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);

	if (args)
	print_mmap(tcp, args, args[5]);
	else
	printaddr(tcp->u_arg[0]);

	return RVAL_DECODED \| RVAL_HEX;
	}

	# if HAVE_ARCH_OLD_MMAP_PGOFF
	/* Params are pointed to by u_arg[0], offset is in pages */
	SYS_FUNC(old_mmap_pgoff)
	{
	kernel_ulong_t *args =
	fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);

	if (args) {
	unsigned long long offset;

	offset = args[5];
	offset *= get_pagesize();

	print_mmap(tcp, args, offset);
	} else {
	printaddr(tcp->u_arg[0]);
	}

	return RVAL_DECODED \| RVAL_HEX;
	}
	# endif /* HAVE_ARCH_OLD_MMAP_PGOFF */
	#endif /* HAVE_ARCH_OLD_MMAP */

	/* Params are passed directly, offset is in bytes */
	SYS_FUNC(mmap)
	{
	/* Example of kernel-side handling of this variety of mmap:
	* arch/x86/kernel/sys_x86_64.c::SYSCALL_DEFINE6(mmap, ...) calls
	* sys_mmap_pgoff(..., off >> PAGE_SHIFT); i.e. off is in bytes,
	* since the above code converts off to pages.
	*/
	print_mmap(tcp, tcp->u_arg, tcp->u_arg[5]);

	return RVAL_DECODED \| RVAL_HEX;
	}

	/* Params are passed directly, offset is in pages */
	SYS_FUNC(mmap_pgoff)
	{
	/* Try test/mmap_offset_decode.c */
	unsigned long long offset;
	offset = tcp->u_arg[5];
	offset *= get_pagesize();
	print_mmap(tcp, tcp->u_arg, offset);

	return RVAL_DECODED \| RVAL_HEX;
	}

	/* Params are passed directly, offset is in 4k units */
	SYS_FUNC(mmap_4koff)
	{
	unsigned long long offset;
	offset = tcp->u_arg[5];
	offset <<= 12;
	print_mmap(tcp, tcp->u_arg, offset);

	return RVAL_DECODED \| RVAL_HEX;
	}

	SYS_FUNC(munmap)
	{
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu, tcp->u_arg[1]);

	return RVAL_DECODED;
	}

	static int
	do_mprotect(struct tcb *tcp, bool has_pkey)
	{
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
	printflags64(mmap_prot, tcp->u_arg[2], "PROT_???");

	if (has_pkey)
	tprintf(", %d", (int) tcp->u_arg[3]);

	return RVAL_DECODED;
	}

	SYS_FUNC(mprotect)
	{
	return do_mprotect(tcp, false);
	}

	SYS_FUNC(pkey_mprotect)
	{
	return do_mprotect(tcp, true);
	}

	#include "xlat/mremap_flags.h"

	SYS_FUNC(mremap)
	{
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu ", %" PRI_klu ", ", tcp->u_arg[1], tcp->u_arg[2]);
	printflags64(mremap_flags, tcp->u_arg[3], "MREMAP_???");
	#ifdef MREMAP_FIXED
	if ((tcp->u_arg[3] & (MREMAP_MAYMOVE \| MREMAP_FIXED)) ==
	(MREMAP_MAYMOVE \| MREMAP_FIXED)) {
	tprints(", ");
	printaddr(tcp->u_arg[4]);
	}
	#endif
	return RVAL_DECODED \| RVAL_HEX;
	}

	#include "xlat/madvise_cmds.h"

	SYS_FUNC(madvise)
	{
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
	printxval(madvise_cmds, tcp->u_arg[2], "MADV_???");

	return RVAL_DECODED;
	}

	#include "xlat/mlockall_flags.h"

	SYS_FUNC(mlockall)
	{
	printflags(mlockall_flags, tcp->u_arg[0], "MCL_???");

	return RVAL_DECODED;
	}

	#include "xlat/mctl_sync.h"

	SYS_FUNC(msync)
	{
	/* addr */
	printaddr(tcp->u_arg[0]);
	/* len */
	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
	/* flags */
	printflags(mctl_sync, tcp->u_arg[2], "MS_???");

	return RVAL_DECODED;
	}

	#include "xlat/mlock_flags.h"

	SYS_FUNC(mlock2)
	{
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
	printflags(mlock_flags, tcp->u_arg[2], "MLOCK_???");

	return RVAL_DECODED;
	}

	SYS_FUNC(mincore)
	{
	if (entering(tcp)) {
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
	} else {
	const unsigned long page_size = get_pagesize();
	const unsigned long page_mask = page_size - 1;
	unsigned long len = tcp->u_arg[1];
	unsigned char *vec = NULL;

	len = len / page_size + (len & page_mask ? 1 : 0);
	if (syserror(tcp) \|\| !verbose(tcp) \|\|
	!tcp->u_arg[2] \|\| !(vec = malloc(len)) \|\|
	umoven(tcp, tcp->u_arg[2], len, vec) < 0)
	printaddr(tcp->u_arg[2]);
	else {
	unsigned long i;
	tprints("[");
	for (i = 0; i < len; i++) {
	if (i)
	tprints(", ");
	if (abbrev(tcp) && i >= max_strlen) {
	tprints("...");
	break;
	}
	tprints((vec[i] & 1) ? "1" : "0");
	}
	tprints("]");
	}
	free(vec);
	}
	return 0;
	}

	SYS_FUNC(remap_file_pages)
	{
	const kernel_ulong_t addr = tcp->u_arg[0];
	const kernel_ulong_t size = tcp->u_arg[1];
	const kernel_ulong_t prot = tcp->u_arg[2];
	const kernel_ulong_t pgoff = tcp->u_arg[3];
	const kernel_ulong_t flags = tcp->u_arg[4];

	printaddr(addr);
	tprintf(", %" PRI_klu ", ", size);
	printflags64(mmap_prot, prot, "PROT_???");
	tprintf(", %" PRI_klu ", ", pgoff);
	print_mmap_flags(flags);

	return RVAL_DECODED;
	}

	#if defined(POWERPC)
	static bool
	print_protmap_entry(struct tcb tcp, void elem_buf, size_t elem_size, void *data)
	{
	tprintf("%#08x", (unsigned int ) elem_buf);

	return true;
	}

	SYS_FUNC(subpage_prot)
	{
	kernel_ulong_t addr = tcp->u_arg[0];
	kernel_ulong_t len = tcp->u_arg[1];
	kernel_ulong_t nmemb = len >> 16;
	kernel_ulong_t map = tcp->u_arg[2];

	printaddr(addr);
	tprintf(", %" PRI_klu ", ", len);

	unsigned int entry;
	print_array(tcp, map, nmemb, &entry, sizeof(entry),
	tfetch_mem, print_protmap_entry, 0);

	return RVAL_DECODED;
	}
	#endif