x86, um: ... and asm-x86 move

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
new file mode 100644
index 000000000000..1bb6f9bbe1ab
--- /dev/null
+++ b/arch/x86/include/asm/ftrace.h
@@ -0,0 +1,24 @@
+#ifndef ASM_X86__FTRACE_H
+#define ASM_X86__FTRACE_H
+
+#ifdef CONFIG_FTRACE
+#define MCOUNT_ADDR             ((long)(mcount))
+#define MCOUNT_INSN_SIZE        5 /* sizeof mcount call */
+
+#ifndef __ASSEMBLY__
+extern void mcount(void);
+
+static inline unsigned long ftrace_call_adjust(unsigned long addr)
+{
+        /*
+         * call mcount is "e8 <4 byte offset>"
+         * The addr points to the 4 byte offset and the caller of this
+         * function wants the pointer to e8. Simply subtract one.
+         */
+        return addr - 1;
+}
+#endif
+
+#endif /* CONFIG_FTRACE */
+
+#endif /* ASM_X86__FTRACE_H */