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| author | Ulrich Drepper <drepper@gmail.com> | 2011-05-28 01:53:26 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-05-28 01:53:26 -0400 |
| commit | c738465a4c13370f58b797a82cdf1c67e1121867 (patch) | |
| tree | 48f4cc32d44387eb6b3b17deaf2d998e65fb7f36 /sysdeps | |
| parent | f1f929d74a08d6f973cec20e311401586f408d35 (diff) | |
| download | glibc-c738465a4c13370f58b797a82cdf1c67e1121867.zip glibc-c738465a4c13370f58b797a82cdf1c67e1121867.tar.gz glibc-c738465a4c13370f58b797a82cdf1c67e1121867.tar.bz2 | |
Add support for time syscall in vDSO
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/init-first.c | 10 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/time.S | 7 |
2 files changed, 16 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/init-first.c b/sysdeps/unix/sysv/linux/x86_64/init-first.c index 23934fc..e676f62 100644 --- a/sysdeps/unix/sysv/linux/x86_64/init-first.c +++ b/sysdeps/unix/sysv/linux/x86_64/init-first.c @@ -28,6 +28,8 @@ strong_alias (__vdso_clock_gettime, __GI___vdso_clock_gettime attribute_hidden) long int (*__vdso_getcpu) (unsigned *, unsigned *, void *); +long int (*__vdso_time) (time_t *) attribute_hidden; + static inline void _libc_vdso_platform_setup (void) @@ -53,6 +55,14 @@ _libc_vdso_platform_setup (void) p = (void *) VSYSCALL_ADDR_vgetcpu; PTR_MANGLE (p); __vdso_getcpu = p; + + p = _dl_vdso_vsym ("time", &linux26); + /* If the vDSO is not available we fall back on the old vsyscall. */ +#define VSYSCALL_ADDR_vtime 0xffffffffff600400 + if (p == NULL) + p = (void *) VSYSCALL_ADDR_vtime; + PTR_MANGLE (p); + __vdso_time = p; } # define VDSO_SETUP _libc_vdso_platform_setup diff --git a/sysdeps/unix/sysv/linux/x86_64/time.S b/sysdeps/unix/sysv/linux/x86_64/time.S index e3f3268..66d7498 100644 --- a/sysdeps/unix/sysv/linux/x86_64/time.S +++ b/sysdeps/unix/sysv/linux/x86_64/time.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2001,02, 2003 Free Software Foundation, Inc. +/* Copyright (C) 2001,02, 2003, 2011 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 @@ -32,7 +32,12 @@ ENTRY (time) sub $0x8, %rsp cfi_adjust_cfa_offset(8) +#ifdef SHARED + movq __vdso_time(%rip), %rax + PTR_DEMANGLE (%rax) +#else movq $VSYSCALL_ADDR_vtime, %rax +#endif callq *%rax add $0x8, %rsp |