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authorAl Viro <viro@zeniv.linux.org.uk>2016-12-25 22:00:03 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-03-29 01:23:23 +0300
commit46583939b98d5a3f13ac71eed9518c6b7a80ae7e (patch)
tree6881eb219e240b9c9a07c29361a6f2caf170677d /arch/arm64/include/asm/extable.h
parentd597580d373774b1bdab84b3d26ff0b55162b916 (diff)
downloadlinux-46583939b98d5a3f13ac71eed9518c6b7a80ae7e.tar.xz
arm64: add extable.h
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/arm64/include/asm/extable.h')
-rw-r--r--arch/arm64/include/asm/extable.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/extable.h b/arch/arm64/include/asm/extable.h
new file mode 100644
index 000000000000..42f50f15a44c
--- /dev/null
+++ b/arch/arm64/include/asm/extable.h
@@ -0,0 +1,25 @@
+#ifndef __ASM_EXTABLE_H
+#define __ASM_EXTABLE_H
+
+/*
+ * The exception table consists of pairs of relative offsets: the first
+ * is the relative offset to an instruction that is allowed to fault,
+ * and the second is the relative offset at which the program should
+ * continue. No registers are modified, so it is entirely up to the
+ * continuation code to figure out what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path. This means when everything is well,
+ * we don't even have to jump over them. Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry
+{
+ int insn, fixup;
+};
+
+#define ARCH_HAS_RELATIVE_EXTABLE
+
+extern int fixup_exception(struct pt_regs *regs);
+#endif