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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-07 15:33:32 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-13 16:26:21 -0400 |
| commit | 4a556f4f56da3110b27e265b79f0e7582115445c (patch) | |
| tree | f5af0b865c867160855e4722b49d7e850dddf944 /arch/tile/include/asm/elf.h | |
| parent | 0c1d1917c547c8e787fb58e20e2de577453c980c (diff) | |
| download | blackbird-op-linux-4a556f4f56da3110b27e265b79f0e7582115445c.tar.gz blackbird-op-linux-4a556f4f56da3110b27e265b79f0e7582115445c.zip | |
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 <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/asm/elf.h')
| -rw-r--r-- | arch/tile/include/asm/elf.h | 5 |
1 files changed, 5 insertions, 0 deletions
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" |
