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x86, extable: Add early_fixup_exception()

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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>
This commit is contained in:
H. Peter Anvin 2012-04-19 15:24:20 -07:00
parent ffc4bc9c6f
commit 6a1ea279c2
1 changed files with 17 additions and 0 deletions
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17
arch/x86/mm/extable.c
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@ -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;
}