x86: uaccess: introduce try and catch framework

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Impact: introduce new uaccess exception handling framework

Introduce {get|put}_user_try and {get|put}_user_catch as new uaccess exception
handling framework.
{get|put}_user_try begins exception block and {get|put}_user_catch(err) ends
the block and gets err if an exception occured in {get|put}_user_ex() in the
block. The exception is stored thread_info->uaccess_err.

The example usage of this framework is below;
int func()
{
	int err = 0;

	get_user_try {
		get_user_ex(...);
		get_user_ex(...);
		:
	} get_user_catch(err);

	return err;
}

Note: get_user_ex() is not clear the value when an exception occurs, it's
different from the behavior of __get_user(), but I think it doesn't matter.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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This commit is contained in:

Hiroshi Shimamoto 2009-01-23 15:49:41 -08:00 • committed by H. Peter Anvin

parent cc86c9e0dc

commit fe40c0af3c

3 changed files with 110 additions and 0 deletions

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1

arch/x86/include/asm/thread_info.h

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103

arch/x86/include/asm/uaccess.h

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6

arch/x86/mm/extable.c

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