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/* arch_prctl call for Linux/x32.
Copyright (C) 2012 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>
/* Since x32 arch_prctl stores 32bit base address of segment register %fs
and %gs as unsigned 64bit value via ARCH_GET_FS and ARCH_GET_GS, we
use a local unsigned 64bit variable to hold the base address and copy
it to ADDR after arch_prctl return. */
int
__arch_prctl (int code, unsigned long *addr)
{
int res;
unsigned long long base_addr;
unsigned long *addr_saved;
switch (code)
{
case ARCH_GET_FS:
case ARCH_GET_GS:
addr_saved = addr;
addr = &base_addr;
break;
default:
break;
}
res = INLINE_SYSCALL (arch_prctl, 2, code, addr);
if (res == 0)
switch (code)
{
case ARCH_GET_FS:
case ARCH_GET_GS:
*addr_saved = (unsigned long) base_addr;
break;
default:
break;
}
return res;
}
weak_alias (__arch_prctl, arch_prctl);
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