4a556f4f56
This change creates the framework for vDSO calls, makes the existing rt_sigreturn() mechanism use it, and adds a fast gettimeofday(). Now that we need to expose the vDSO address to userspace, we add AT_SYSINFO_EHDR to the set of aux entries provided to userspace. (You can disable any extra vDSO support by booting with vdso=0, but the rt_sigreturn vDSO page will still be provided.) Note that glibc has supported the tile vDSO since release 2.17. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
31 lines
1 KiB
ArmAsm
31 lines
1 KiB
ArmAsm
/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/linkage.h>
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#include <arch/abi.h>
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#include <asm/unistd.h>
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/*
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* Note that libc has a copy of this function that it uses to compare
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* against the PC when a stack backtrace ends, so if this code is
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* changed, the libc implementation(s) should also be updated.
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*/
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ENTRY(__vdso_rt_sigreturn)
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moveli TREG_SYSCALL_NR_NAME, __NR_rt_sigreturn
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swint1
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/* We don't use ENDPROC to avoid tagging this symbol as FUNC,
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* which confuses the perf tool.
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*/
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END(__vdso_rt_sigreturn)
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