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authorH. Peter Anvin <hpa@linux.intel.com>2012-04-19 15:24:20 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2012-04-19 15:31:04 -0700
commit6a1ea279c210e7dc05de86dc29c0d4f577f484fb (patch)
treed27b32e788ad5391f0457f939752c8900ac45222 /arch/x86/mm
parentffc4bc9c6fa4eaf935d96d139bfa7443cac0b88e (diff)
downloadlinux-6a1ea279c210e7dc05de86dc29c0d4f577f484fb.tar.bz2
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.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index 1fb85dbe390a..5555675dadb6 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;
+}