Merge branch 'work.uaccess2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[cascardo/linux.git] / arch / x86 / include / asm / extable.h

diff --git a/arch/x86/include/asm/extable.h b/arch/x86/include/asm/extable.h
new file mode 100644 (file)
index 0000000..b8ad261
--- /dev/null
+++ b/arch/x86/include/asm/extable.h
@@ -0,0 +1,35 @@
+#ifndef _ASM_X86_EXTABLE_H
+#define _ASM_X86_EXTABLE_H
+/*
+ * The exception table consists of triples of addresses relative to the
+ * exception table entry itself. The first address is of an instruction
+ * that is allowed to fault, the second is the target at which the program
+ * should continue. The third is a handler function to deal with the fault
+ * caused by the instruction in the first field.
+ *
+ * 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, handler;
+};
+struct pt_regs;
+
+#define ARCH_HAS_RELATIVE_EXTABLE
+
+#define swap_ex_entry_fixup(a, b, tmp, delta)                  \
+       do {                                                    \
+               (a)->fixup = (b)->fixup + (delta);              \
+               (b)->fixup = (tmp).fixup - (delta);             \
+               (a)->handler = (b)->handler + (delta);          \
+               (b)->handler = (tmp).handler - (delta);         \
+       } while (0)
+
+extern int fixup_exception(struct pt_regs *regs, int trapnr);
+extern bool ex_has_fault_handler(unsigned long ip);
+extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
+
+#endif