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84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/* time system call for Linux/PowerPC.
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Copyright (C) 2013-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef SHARED
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# include <time.h>
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# include <sysdep.h>
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# include <dl-vdso.h>
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# include <bits/libc-vdso.h>
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# include <dl-machine.h>
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void *time_ifunc (void) asm ("time");
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static time_t
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time_syscall (time_t *t)
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{
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struct timeval tv;
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time_t result;
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if (INLINE_VSYSCALL (gettimeofday, 2, &tv, NULL) < 0)
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result = (time_t) -1;
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else
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result = (time_t) tv.tv_sec;
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if (t != NULL)
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*t = result;
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return result;
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}
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void *
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time_ifunc (void)
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{
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PREPARE_VERSION (linux2615, "LINUX_2.6.15", 123718565);
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/* If the vDSO is not available we fall back to the syscall. */
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void *vdso_time = _dl_vdso_vsym ("__kernel_time", &linux2615);
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return (vdso_time ? VDSO_IFUNC_RET (vdso_time)
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: (void*)time_syscall);
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}
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asm (".type time, %gnu_indirect_function");
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/* This is doing "libc_hidden_def (time)" but the compiler won't
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* let us do it in C because it doesn't know we're defining time
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* here in this file. */
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asm (".globl __GI_time");
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/* __GI_time is defined as hidden and for ppc32 it enables the
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compiler make a local call (symbol@local) for internal GLIBC usage. It
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means the PLT won't be used and the ifunc resolver will be called directly.
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For ppc64 a call to a function in another translation unit might use a
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different toc pointer thus disallowing direct branchess and making internal
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ifuncs calls safe. */
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#ifdef __powerpc64__
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asm ("__GI_time = time");
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#else
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time_t
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__time_vsyscall (time_t *t)
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{
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return INLINE_VSYSCALL (time, 1, t);
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}
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asm ("__GI_time = __time_vsyscall");
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#endif
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#else
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#include <sysdeps/posix/time.c>
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#endif
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