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Re: PATCH: Add x32 time
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Thu, 17 May 2012 06:18:56 -0700
- Subject: Re: PATCH: Add x32 time
- References: <20120517120322.GA19992@intel.com>
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
On Thu, May 17, 2012 at 05:03:22AM -0700, H.J. Lu wrote:
> Hi,
>
> On x32, time_t is 64-bit and we don't use VSYSCALL. This patch handles
> int64 return and use regular time system call as fallback. Tested on
> x32. OK to install?
>
X32 doesn't fallback since time is always in vDSO. Tested on Linux/x32.
OK to install?
Thanks.
H.J.
---
* sysdeps/unix/sysv/linux/x86_64/x32/time.c: New file.
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/time.c b/sysdeps/unix/sysv/linux/x86_64/x32/time.c
new file mode 100644
index 0000000..aba1aca
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/time.c
@@ -0,0 +1,70 @@
+/* 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 <sysdep.h>
+#include <time.h>
+
+# undef INLINE_SYSCALL
+# define INLINE_SYSCALL(name, nr, args...) \
+ ({ \
+ unsigned long long int resultvar = INTERNAL_SYSCALL (name, , nr, args); \
+ if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (resultvar, ), 0)) \
+ { \
+ __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, )); \
+ resultvar = (unsigned long long int) -1LL; \
+ } \
+ (long long int) resultvar; })
+
+# undef INTERNAL_SYSCALL_NCS
+# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
+ ({ \
+ unsigned long long int resultvar; \
+ LOAD_ARGS_##nr (args) \
+ LOAD_REGS_##nr \
+ asm volatile ( \
+ "syscall\n\t" \
+ : "=a" (resultvar) \
+ : "0" (name) ASM_ARGS_##nr : "memory", "cc", "r11", "cx"); \
+ (long long int) resultvar; })
+
+# undef INTERNAL_SYSCALL_ERROR_P
+# define INTERNAL_SYSCALL_ERROR_P(val, err) \
+ ((unsigned long long int) (long long int) (val) >= -4095LL)
+
+#ifdef SHARED
+# include <dl-vdso.h>
+
+void *time_ifunc (void) __asm__ ("__GI_time");
+
+void *
+time_ifunc (void)
+{
+ PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
+
+ return _dl_vdso_vsym ("__vdso_time", &linux26);
+}
+__asm (".type __GI_time, %gnu_indirect_function");
+#else
+time_t
+time (time_t *t)
+{
+ return INLINE_SYSCALL (time, 1, t);
+}
+#endif
+
+libc_hidden_def (time)