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author | H. Peter Anvin <hpa@linux.intel.com> | 2012-04-19 22:24:20 (GMT) |
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committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-04-19 22:31:04 (GMT) |
commit | 6a1ea279c210e7dc05de86dc29c0d4f577f484fb (patch) | |
tree | d27b32e788ad5391f0457f939752c8900ac45222 /arch/x86/mm | |
parent | ffc4bc9c6fa4eaf935d96d139bfa7443cac0b88e (diff) | |
download | linux-6a1ea279c210e7dc05de86dc29c0d4f577f484fb.tar.xz |
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>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r-- | arch/x86/mm/extable.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index 1fb85db..5555675 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -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; +} |