From 9031fefde6f2ac1d1e5e0f8f4b22db4a091229bb Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 5 Mar 2012 11:49:31 +0000 Subject: arm64: VDSO support This patch adds VDSO support for 64-bit applications. The VDSO code is currently used for sys_rt_sigreturn() and optimised gettimeofday() (using the user-accessible generic counter). Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas Acked-by: Tony Lindgren Acked-by: Nicolas Pitre Acked-by: Olof Johansson Acked-by: Santosh Shilimkar Acked-by: Arnd Bergmann --- arch/arm64/include/asm/vdso.h | 41 ++++++++++++++++++++++++++++++++ arch/arm64/include/asm/vdso_datapage.h | 43 ++++++++++++++++++++++++++++++++++ 2 files changed, 84 insertions(+) create mode 100644 arch/arm64/include/asm/vdso.h create mode 100644 arch/arm64/include/asm/vdso_datapage.h (limited to 'arch/arm64/include/asm') diff --git a/arch/arm64/include/asm/vdso.h b/arch/arm64/include/asm/vdso.h new file mode 100644 index 00000000000..839ce0031bd --- /dev/null +++ b/arch/arm64/include/asm/vdso.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2012 ARM Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#ifndef __ASM_VDSO_H +#define __ASM_VDSO_H + +#ifdef __KERNEL__ + +/* + * Default link address for the vDSO. + * Since we randomise the VDSO mapping, there's little point in trying + * to prelink this. + */ +#define VDSO_LBASE 0x0 + +#ifndef __ASSEMBLY__ + +#include + +#define VDSO_SYMBOL(base, name) \ +({ \ + (void *)(vdso_offset_##name - VDSO_LBASE + (unsigned long)(base)); \ +}) + +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* __ASM_VDSO_H */ diff --git a/arch/arm64/include/asm/vdso_datapage.h b/arch/arm64/include/asm/vdso_datapage.h new file mode 100644 index 00000000000..de66199673d --- /dev/null +++ b/arch/arm64/include/asm/vdso_datapage.h @@ -0,0 +1,43 @@ +/* + * Copyright (C) 2012 ARM Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#ifndef __ASM_VDSO_DATAPAGE_H +#define __ASM_VDSO_DATAPAGE_H + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ + +struct vdso_data { + __u64 cs_cycle_last; /* Timebase at clocksource init */ + __u64 xtime_clock_sec; /* Kernel time */ + __u64 xtime_clock_nsec; + __u64 xtime_coarse_sec; /* Coarse time */ + __u64 xtime_coarse_nsec; + __u64 wtm_clock_sec; /* Wall to monotonic time */ + __u64 wtm_clock_nsec; + __u32 tb_seq_count; /* Timebase sequence counter */ + __u32 cs_mult; /* Clocksource multiplier */ + __u32 cs_shift; /* Clocksource shift */ + __u32 tz_minuteswest; /* Whacky timezone stuff */ + __u32 tz_dsttime; + __u32 use_syscall; +}; + +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* __ASM_VDSO_DATAPAGE_H */ -- cgit v1.2.3-70-g09d2