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/* arch_prctl call for Linux/x32.
Copyright (C) 2012-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sysdep.h>
#include <stdint.h>
/* Since x32 arch_prctl stores 32-bit base address of segment registers
%fs and %gs as unsigned 64-bit value via ARCH_GET_FS and ARCH_GET_GS,
we use an unsigned 64-bit variable to hold the base address and copy
it to ADDR after the system call returns. */
int
__arch_prctl (int code, uintptr_t *addr)
{
int res;
uint64_t addr64;
void *prctl_arg = addr;
switch (code)
{
case ARCH_GET_FS:
case ARCH_GET_GS:
prctl_arg = &addr64;
break;
}
res = INLINE_SYSCALL (arch_prctl, 2, code, prctl_arg);
if (res == 0)
switch (code)
{
case ARCH_GET_FS:
case ARCH_GET_GS:
/* Check for a large value that overflows. */
if ((uintptr_t) addr64 != addr64)
{
__set_errno (EOVERFLOW);
return -1;
}
*addr = (uintptr_t) addr64;
break;
}
return res;
}
weak_alias (__arch_prctl, arch_prctl)
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