diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c new file mode 100644 index 0000000000..67880e4b28 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c @@ -0,0 +1,63 @@ +/* arch_prctl call for Linux/x32. + Copyright (C) 2012-2017 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) |