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author | H.J. Lu <hjl.tools@gmail.com> | 2012-05-22 12:43:46 -0700 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2012-05-22 12:43:46 -0700 |
commit | da0331a873dbb62462c151c3d824da2f6fe2e770 (patch) | |
tree | c7adb0004a8810c926e47ef131427bf8f936e839 /sysdeps/unix | |
parent | 31a39bd8410d366ee03b9e48e9d56b8099868f26 (diff) | |
download | glibc-da0331a873dbb62462c151c3d824da2f6fe2e770.tar.gz glibc-da0331a873dbb62462c151c3d824da2f6fe2e770.tar.xz glibc-da0331a873dbb62462c151c3d824da2f6fe2e770.zip |
Add x32 arch_prctl
Diffstat (limited to 'sysdeps/unix')
-rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/x32/Makefile | 4 | ||||
-rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c | 62 |
2 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/Makefile b/sysdeps/unix/sysv/linux/x86_64/x32/Makefile index 5f77df7c7a..aa78238a0d 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/Makefile +++ b/sysdeps/unix/sysv/linux/x86_64/x32/Makefile @@ -1,3 +1,7 @@ +ifeq ($(subdir),misc) +sysdep_routines += arch_prctl +endif + ifeq ($(subdir),posix) sysdep_routines += getcpu sched_getcpu-static endif diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c b/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c new file mode 100644 index 0000000000..6933306de9 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c @@ -0,0 +1,62 @@ +/* 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 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) |