Commit 1713ce7c authored by Nathan Lynch's avatar Nathan Lynch Committed by Russell King
Browse files

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: default avatarNathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent c517d838

arch/arm/include/asm/Kbuild

+0 −1
Original line number Diff line number Diff line 




generic-y += auxvec.h

generic-y += bitsperlong.h

generic-y += cputime.h

generic-y += current.h

arch/arm/include/asm/auxvec.h

0 → 100644
+1 −0
Original line number Diff line number Diff line 
#include <uapi/asm/auxvec.h>

arch/arm/include/asm/elf.h

+9 −0
Original line number Diff line number Diff line 
#ifndef __ASMARM_ELF_H

#define __ASMARM_ELF_H



#include <asm/auxvec.h>

#include <asm/hwcap.h>

#include <asm/vdso_datapage.h>



/*

 * ELF register definitions..
@@ -130,6 +132,13 @@ extern unsigned long arch_randomize_brk(struct mm_struct *mm); 
#define arch_randomize_brk arch_randomize_brk



#ifdef CONFIG_MMU

#ifdef CONFIG_VDSO

#define ARCH_DLINFO						\

do {								\

	NEW_AUX_ENT(AT_SYSINFO_EHDR,				\

		    (elf_addr_t)current->mm->context.vdso);	\

} while (0)

#endif

#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1

struct linux_binprm;

int arch_setup_additional_pages(struct linux_binprm *, int);

arch/arm/include/asm/mmu.h

+3 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ typedef struct { 
#endif

	unsigned int	vmalloc_seq;

	unsigned long	sigpage;

#ifdef CONFIG_VDSO

	unsigned long	vdso;

#endif

} mm_context_t;



#ifdef CONFIG_CPU_HAS_ASID

arch/arm/include/asm/vdso.h

0 → 100644
+32 −0
Original line number Diff line number Diff line 
#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 */

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