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MIPS: Preliminary VDSO

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This is a preliminary patch to add a vdso to all user processes.  Still
missing are ELF headers and .eh_frame information.  But it is enough to
allow us to move signal trampolines off of the stack.  Note that emulation
of branch delay slots in the FPU emulator still requires the stack.

We allocate a single page (the vdso) and write all possible signal
trampolines into it.  The stack is moved down by one page and the vdso is
mapped into this space.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/975/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2010-02-18 16:13:04 -08:00 • committed by Ralf Baechle
parent 58b9e2239f
commit c52d0d30ae
8 changed files with 165 additions and 6 deletions
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29
arch/mips/include/asm/vdso.h Normal file
View file

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2009 Cavium Networks
*/
#ifndef __ASM_VDSO_H
#define __ASM_VDSO_H
#include <linux/types.h>
#ifdef CONFIG_32BIT
struct mips_vdso {
u32 signal_trampoline[2];
u32 rt_signal_trampoline[2];
};
#else /* !CONFIG_32BIT */
struct mips_vdso {
u32 o32_signal_trampoline[2];
u32 o32_rt_signal_trampoline[2];
u32 rt_signal_trampoline[2];
u32 n32_rt_signal_trampoline[2];
};
#endif /* CONFIG_32BIT */
#endif /* __ASM_VDSO_H */