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authorIngo Molnar <mingo@elte.hu>2008-10-27 12:50:54 +0300
committerIngo Molnar <mingo@elte.hu>2008-10-27 12:50:54 +0300
commit4944dd62de21230af039eda7cd218e9a09021d11 (patch)
treebac70f7bab8506c7e1b0408bacbdb0b1d77262e9 /arch/x86/include/asm/ftrace.h
parentf17845e5d97ead8fbdadfd40039e058ec7cf4a42 (diff)
parent0173a3265b228da319ceb9c1ec6a5682fd1b2d92 (diff)
downloadlinux-4944dd62de21230af039eda7cd218e9a09021d11.tar.xz
Merge commit 'v2.6.28-rc2' into tracing/urgent
Diffstat (limited to 'arch/x86/include/asm/ftrace.h')
-rw-r--r--arch/x86/include/asm/ftrace.h24
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..9e8bc29b8b17
--- /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_FUNCTION_TRACER
+#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_FUNCTION_TRACER */
+
+#endif /* _ASM_X86_FTRACE_H */