linux/arch/arm/include/asm/vdso.h
Nathan Lynch 1713ce7c43 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>
2015-03-27 22:20:45 +00:00

33 lines
503 B
C

#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 */