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binfmt_flat: provide an asm-generic/flat.h

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This file implements the flat get/put reloc helpers for architectures
that do not need to overload the relocs by simply using get_user/put_user.

Note that many nommu architectures currently use {get,put}_unaligned, which
looks a little bogus and should probably later be switched over to this
version as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Christoph Hellwig 2019-06-13 09:08:59 +02:00 committed by Greg Ungerer
parent cf9a566c2c
commit 7a8998c9d8
3 changed files with 6 additions and 28 deletions
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1
arch/arm/include/asm/Kbuild
View File

@ -5,6 +5,7 @@ generic-y += early_ioremap.h
generic-y += emergency-restart.h
generic-y += exec.h
generic-y += extable.h
generic-y += flat.h
generic-y += irq_regs.h
generic-y += kdebug.h
generic-y += local.h

21
arch/m68k/include/asm/flat.h
View File

@ -6,26 +6,7 @@
#ifndef __M68KNOMMU_FLAT_H__
#define __M68KNOMMU_FLAT_H__
#include <linux/uaccess.h>
static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
u32 *addr, u32 *persistent)
{
#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
#else
return get_user(*addr, rp);
#endif
}
static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
{
#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
return copy_to_user(rp, &addr, 4) ? -EFAULT : 0;
#else
return put_user(addr, rp);
#endif
}
#include <asm-generic/flat.h>
#define FLAT_PLAT_INIT(regs) \
do { \

12
arch/arm/include/asm/flat.h → include/asm-generic/flat.h
View File

@ -1,15 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* arch/arm/include/asm/flat.h -- uClinux flat-format executables
*/
#ifndef __ARM_FLAT_H__
#define __ARM_FLAT_H__
#ifndef _ASM_GENERIC_FLAT_H
#define _ASM_GENERIC_FLAT_H
#include <linux/uaccess.h>
static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
u32 *addr, u32 *persistent)
u32 *addr, u32 *persistent)
{
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
@ -27,4 +23,4 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
#endif
}
#endif /* __ARM_FLAT_H__ */
#endif /* _ASM_GENERIC_FLAT_H */