From 4a556f4f56da3110b27e265b79f0e7582115445c Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Wed, 7 Aug 2013 15:33:32 -0400 Subject: tile: implement gettimeofday() via vDSO 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 --- arch/tile/include/asm/elf.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/tile/include/asm/elf.h') diff --git a/arch/tile/include/asm/elf.h b/arch/tile/include/asm/elf.h index ff8a93408823..31d854f1b83b 100644 --- a/arch/tile/include/asm/elf.h +++ b/arch/tile/include/asm/elf.h @@ -132,6 +132,11 @@ extern int dump_task_regs(struct task_struct *, elf_gregset_t *); struct linux_binprm; extern int arch_setup_additional_pages(struct linux_binprm *bprm, int executable_stack); +#define ARCH_DLINFO \ +do { \ + NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \ +} while (0) + #ifdef CONFIG_COMPAT #define COMPAT_ELF_PLATFORM "tilegx-m32" -- cgit