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ARM: 8329/1: miscellaneous vdso infrastructure, preparation

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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>
This commit is contained in:
Nathan Lynch
2015-03-25 19:13:16 +01:00
committed by Russell King
parent c517d838eb
commit 1713ce7c43
8 changed files with 113 additions and 1 deletions
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7
arch/arm/include/uapi/asm/auxvec.h Normal file
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@@ -0,0 +1,7 @@
#ifndef __ASM_AUXVEC_H
#define __ASM_AUXVEC_H
/* VDSO location */
#define AT_SYSINFO_EHDR 33
#endif