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[ARM] nommu: uaccess tweaks

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MMUless systems have only one address space for all threads, so
both the usual access_ok() checks, and the exception handling do
not make much sense.

Hence, discard the fixup and exception tables at link time, use
memcpy/memset for the user copy/clearing functions, and define
the permission check macros to be constants.

Some of this patch was derived from the equivalent patch by
Hyok S. Choi.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2006-06-21 20:38:17 +01:00
committed by Russell King
parent 002547b4f8
commit 9641c7cc5a
4 changed files with 108 additions and 59 deletions
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7
arch/arm/kernel/armksyms.c
View File

@ -109,11 +109,13 @@ EXPORT_SYMBOL(memchr);
EXPORT_SYMBOL(__memzero);
/* user mem (segment) */
EXPORT_SYMBOL(__strnlen_user);
EXPORT_SYMBOL(__strncpy_from_user);
#ifdef CONFIG_MMU
EXPORT_SYMBOL(__copy_from_user);
EXPORT_SYMBOL(__copy_to_user);
EXPORT_SYMBOL(__clear_user);
EXPORT_SYMBOL(__strnlen_user);
EXPORT_SYMBOL(__strncpy_from_user);
EXPORT_SYMBOL(__get_user_1);
EXPORT_SYMBOL(__get_user_2);
@ -123,6 +125,7 @@ EXPORT_SYMBOL(__put_user_1);
EXPORT_SYMBOL(__put_user_2);
EXPORT_SYMBOL(__put_user_4);
EXPORT_SYMBOL(__put_user_8);
#endif
/* crypto hash */
EXPORT_SYMBOL(sha_transform);

8
arch/arm/kernel/vmlinux.lds.S
View File

@ -80,6 +80,10 @@ SECTIONS
*(.exit.text)
*(.exit.data)
*(.exitcall.exit)
#ifndef CONFIG_MMU
*(.fixup)
*(__ex_table)
#endif
}
.text : { /* Real text segment */
@ -87,7 +91,9 @@ SECTIONS
*(.text)
SCHED_TEXT
LOCK_TEXT
#ifdef CONFIG_MMU
*(.fixup)
#endif
*(.gnu.warning)
*(.rodata)
*(.rodata.*)
@ -142,7 +148,9 @@ SECTIONS
*/
. = ALIGN(32);
__start___ex_table = .;
#ifdef CONFIG_MMU
*(__ex_table)
#endif
__stop___ex_table = .;
/*