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authorH.J. Lu <hjl.tools@gmail.com>2012-05-22 12:43:46 -0700
committerH.J. Lu <hjl.tools@gmail.com>2012-05-22 12:43:46 -0700
commitda0331a873dbb62462c151c3d824da2f6fe2e770 (patch)
treec7adb0004a8810c926e47ef131427bf8f936e839 /sysdeps
parent31a39bd8410d366ee03b9e48e9d56b8099868f26 (diff)
downloadglibc-da0331a873dbb62462c151c3d824da2f6fe2e770.tar.gz
Add x32 arch_prctl
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/x32/Makefile4
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/x32/arch_prctl.c62
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)