diff options
| author | Nathan Lynch <nathan_lynch@mentor.com> | 2015-03-25 19:13:16 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-03-27 22:20:45 +0000 |
| commit | 1713ce7c43755fe8b0f31ea317513129bf784909 (patch) | |
| tree | f082086f181ac7ce03324da1d9e2b629c08f6518 /arch/arm/include/asm/vdso.h | |
| parent | c517d838eb7d07bbe9507871fab3931deccff539 (diff) | |
ARM: 8329/1: miscellaneous vdso infrastructure, preparation
Define the layout of the data structure shared between kernel and
userspace.
Track the vdso address in the mm_context; needed for communicating
AT_SYSINFO_EHDR to the ELF loader.
Add declarations for arm_install_vdso; implementation is in a
following patch.
Define AT_SYSINFO_EHDR, and, if CONFIG_VDSO=y, report the vdso shared
object address via the ELF auxiliary vector.
Note - this adds the AT_SYSINFO_EHDR in a new user-visible header
asm/auxvec.h; this is consistent with other architectures.
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/vdso.h')
| -rw-r--r-- | arch/arm/include/asm/vdso.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/include/asm/vdso.h b/arch/arm/include/asm/vdso.h new file mode 100644 index 000000000000..d0295f1dd1a3 --- /dev/null +++ b/arch/arm/include/asm/vdso.h @@ -0,0 +1,32 @@ +#ifndef __ASM_VDSO_H +#define __ASM_VDSO_H + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ + +struct mm_struct; + +#ifdef CONFIG_VDSO + +void arm_install_vdso(struct mm_struct *mm, unsigned long addr); + +extern char vdso_start, vdso_end; + +extern unsigned int vdso_total_pages; + +#else /* CONFIG_VDSO */ + +static inline void arm_install_vdso(struct mm_struct *mm, unsigned long addr) +{ +} + +#define vdso_total_pages 0 + +#endif /* CONFIG_VDSO */ + +#endif /* __ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* __ASM_VDSO_H */ |