Fixed itrace on RHEL5 (PR10091).

PR10091 fix.
* runtime/itrace.c: Includes ptrace_compatibility.h.
  (usr_itrace_report_quiesce): Corrected return value for original version
  of utrace.
* runtime/ptrace_compatibility.h: Defines arch_has_single_step() and
  arch_has_block_step() in terms of ARCH_HAS_SINGLE_STEP and
  ARCH_HAS_BLOCK_STEP.

1 files changed, 50 insertions, 0 deletions

diff --git a/runtime/ptrace_compatibility.h b/runtime/ptrace_compatibility.h
new file mode 100644
index 00000000..939c3b56
--- /dev/null
+++ b/runtime/ptrace_compatibility.h
@@ -0,0 +1,50 @@
+#ifndef _PTRACE_COMPATIBILITY_H_
+#define _PTRACE_COMPATIBILITY_H_
+
+#include <linux/ptrace.h>
+
+/* Older kernel's linux/ptrace.h don't define
+ * arch_has_single_step()/arch_has_block_step(). */
+
+#ifndef arch_has_single_step
+
+#include <linux/tracehook.h>
+
+/**
+ * arch_has_single_step - does this CPU support user-mode single-step?
+ *
+ * If this is defined, then there must be function declarations or
+ * inlines for user_enable_single_step() and user_disable_single_step().
+ * arch_has_single_step() should evaluate to nonzero iff the machine
+ * supports instruction single-step for user mode.
+ * It can be a constant or it can test a CPU feature bit.
+ */
+
+#ifdef ARCH_HAS_SINGLE_STEP
+#define arch_has_single_step()	(ARCH_HAS_SINGLE_STEP)
+#else
+#define arch_has_single_step()	(0)
+#endif	/* ARCH_HAS_SINGLE_STEP */
+
+#endif	/* arch_has_single_step */
+
+#ifndef arch_has_block_step
+/**
+ * arch_has_block_step - does this CPU support user-mode block-step?
+ *
+ * If this is defined, then there must be a function declaration or inline
+ * for user_enable_block_step(), and arch_has_single_step() must be defined
+ * too.  arch_has_block_step() should evaluate to nonzero iff the machine
+ * supports step-until-branch for user mode.  It can be a constant or it
+ * can test a CPU feature bit.
+ */
+
+#ifdef ARCH_HAS_BLOCK_STEP
+#define arch_has_block_step()	(ARCH_HAS_BLOCK_STEP)
+#else
+#define arch_has_block_step()   (0)
+#endif	/* ARCH_HAS_BLOCK_STEP */
+
+#endif	/* arch_has_block_step */
+
+#endif	/* _PTRACE_COMPATIBILITY_H_ */