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Add support for time syscall in vDSO

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This commit is contained in:
Ulrich Drepper 2011-05-28 01:53:26 -04:00
parent f1f929d74a
commit c738465a4c
3 changed files with 22 additions and 1 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
2011-05-28 Ulrich Drepper <drepper@gmail.com>
[BZ #12813]
* sysdeps/unix/sysv/linux/x86_64/init-first.c (__vdso_time): Retrieve
time symbol from vDSO. Substitute with vsyscall if not available.
* sysdeps/unix/sysv/linux/x86_64/time.S [SHARED]: Use
__vdso_time.
* sysdeps/unix/sysv/linux/internal_sendmmsg.S: New file.
* sysdeps/unix/sysv/linux/sendmmsg.c: New file.
* sysdeps/unix/sysv/linux/Makefile [subdir=socket] (sysdep_routines):

10
sysdeps/unix/sysv/linux/x86_64/init-first.c
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@ -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

7
sysdeps/unix/sysv/linux/x86_64/time.S
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@ -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