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| author | Christoph Hellwig <hch@lst.de> | 2019-06-13 09:08:59 +0200 |
|---|---|---|
| committer | Greg Ungerer <gerg@kernel.org> | 2019-06-24 09:16:47 +1000 |
| commit | 7a8998c9d830b59626e049a827678ba444fcf8e2 (patch) | |
| tree | e49c18fba9af2e182f1675ebb8025dcbb1277da6 /include/asm-generic/flat.h | |
| parent | cf9a566c2c06ac34425c4faf6d32ac55ddbeea7a (diff) | |
| download | lwn-7a8998c9d830b59626e049a827678ba444fcf8e2.tar.gz lwn-7a8998c9d830b59626e049a827678ba444fcf8e2.zip | |
binfmt_flat: provide an asm-generic/flat.h
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>
Diffstat (limited to 'include/asm-generic/flat.h')
| -rw-r--r-- | include/asm-generic/flat.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-generic/flat.h b/include/asm-generic/flat.h new file mode 100644 index 000000000000..fcd2b45c0735 --- /dev/null +++ b/include/asm-generic/flat.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#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) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + 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) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + return copy_to_user(rp, &addr, 4) ? -EFAULT : 0; +#else + return put_user(addr, rp); +#endif +} + +#endif /* _ASM_GENERIC_FLAT_H */ |