Commit 6a1ea279 authored Apr 19, 2012 by H. Peter Anvin

x86, extable: Add early_fixup_exception()

Add a restricted version of fixup_exception() to be used during early
boot only. In particular, this doesn't support the try..catch variant
since we may not have a thread_info set up yet.

This relies on the exception table being sorted already at build time.

Link: http://lkml.kernel.org/r/1334794610-5546-1-git-send-email-hpa@zytor.com

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

parent ffc4bc9c

arch/x86/mm/extable.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -35,3 +35,20 @@ int fixup_exception(struct pt_regs *regs)

		return 0;
		}

		/* Restricted version used during very early boot */
		int __init early_fixup_exception(unsigned long *ip)
		{
		const struct exception_table_entry *fixup;

		fixup = search_exception_tables(*ip);
		if (fixup) {
		if (fixup->fixup < 16)
		return 0; /* Not supported during early boot */

		*ip = fixup->fixup;
		return 1;
		}

		return 0;
		}