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/*
* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2015-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "print_fields.h"
#include <fcntl.h>
#include "xlat/uffd_flags.h"
SYS_FUNC(userfaultfd)
{
printflags(uffd_flags, tcp->u_arg[0], "UFFD_???");
return RVAL_DECODED | RVAL_FD;
}
#ifdef HAVE_LINUX_USERFAULTFD_H
# include <linux/ioctl.h>
# include <linux/userfaultfd.h>
# include "xlat/uffd_api_features.h"
# include "xlat/uffd_api_flags.h"
# include "xlat/uffd_copy_flags.h"
# include "xlat/uffd_register_ioctl_flags.h"
# include "xlat/uffd_register_mode_flags.h"
# include "xlat/uffd_zeropage_flags.h"
static void
tprintf_uffdio_range(const struct uffdio_range *range)
{
PRINT_FIELD_X("{", *range, start);
PRINT_FIELD_X(", ", *range, len);
tprints("}");
}
#define PRINT_FIELD_UFFDIO_RANGE(prefix_, where_, field_) \
do { \
STRACE_PRINTF("%s%s=", (prefix_), #field_); \
tprintf_uffdio_range(&(where_).field_); \
} while (0)
int
uffdio_ioctl(struct tcb *const tcp, const unsigned int code,
const kernel_ulong_t arg)
{
switch (code) {
case UFFDIO_API: {
uint64_t *entering_features;
struct uffdio_api ua;
if (entering(tcp)) {
tprints(", ");
if (umove_or_printaddr(tcp, arg, &ua))
break;
PRINT_FIELD_X("{", ua, api);
PRINT_FIELD_FLAGS(", ", ua, features, uffd_api_features,
"UFFD_FEATURE_???");
entering_features = malloc(sizeof(*entering_features));
if (entering_features) {
*entering_features = ua.features;
set_tcb_priv_data(tcp, entering_features, free);
}
return 0;
}
if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
entering_features = get_tcb_priv_data(tcp);
if (!entering_features
|| *entering_features != ua.features) {
PRINT_FIELD_FLAGS(" => ", ua, features,
uffd_api_features,
"UFFD_FEATURE_???");
}
PRINT_FIELD_FLAGS(", ", ua, ioctls, uffd_api_flags,
"_UFFDIO_???");
}
tprints("}");
break;
}
case UFFDIO_COPY: {
struct uffdio_copy uc;
if (entering(tcp)) {
tprints(", ");
if (umove_or_printaddr(tcp, arg, &uc))
return RVAL_IOCTL_DECODED;
PRINT_FIELD_X("{", uc, dst);
PRINT_FIELD_X(", ", uc, src);
PRINT_FIELD_X(", ", uc, len);
PRINT_FIELD_FLAGS(", ", uc, mode, uffd_copy_flags,
"UFFDIO_COPY_???");
return 0;
}
if (!syserror(tcp) && !umove(tcp, arg, &uc))
PRINT_FIELD_X(", ", uc, copy);
tprints("}");
break;
}
case UFFDIO_REGISTER: {
struct uffdio_register ur;
if (entering(tcp)) {
tprints(", ");
if (umove_or_printaddr(tcp, arg, &ur))
return RVAL_IOCTL_DECODED;
PRINT_FIELD_UFFDIO_RANGE("{", ur, range);
PRINT_FIELD_FLAGS(", ", ur, mode,
uffd_register_mode_flags,
"UFFDIO_REGISTER_MODE_???");
return 0;
}
if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
PRINT_FIELD_FLAGS(", ", ur, ioctls,
uffd_register_ioctl_flags,
"UFFDIO_???");
}
tprints("}");
break;
}
case UFFDIO_UNREGISTER:
case UFFDIO_WAKE: {
struct uffdio_range ura;
tprints(", ");
if (!umove_or_printaddr(tcp, arg, &ura))
tprintf_uffdio_range(&ura);
break;
}
case UFFDIO_ZEROPAGE: {
struct uffdio_zeropage uz;
if (entering(tcp)) {
tprints(", ");
if (umove_or_printaddr(tcp, arg, &uz))
return RVAL_IOCTL_DECODED;
PRINT_FIELD_UFFDIO_RANGE("{", uz, range);
PRINT_FIELD_FLAGS(", ", uz, mode, uffd_zeropage_flags,
"UFFDIO_ZEROPAGE_???");
return 0;
}
if (!syserror(tcp) && !umove(tcp, arg, &uz))
PRINT_FIELD_X(", ", uz, zeropage);
tprints("}");
break;
}
default:
return RVAL_DECODED;
}
return RVAL_IOCTL_DECODED;
}
#endif /* HAVE_LINUX_USERFAULTFD_H */
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