ARM: Disable safepoints in JITted code

[Andrew Haley]

JIT safepoints cause odd crashes.  This patch temporarily disables
them until I debug the problem.

Andrew.


2011-12-22  Andrew Haley  <aph at redhat.com>

        * arm_port/hotspot/src/cpu/zero/vm/thumb2.cpp (Thumb2_Safepoint):
        Disable.

diff -r cf80d2049346 -r e937f2726d70 arm_port/hotspot/src/cpu/zero/vm/thumb2.cpp
--- a/arm_port/hotspot/src/cpu/zero/vm/thumb2.cpp       Tue Dec 20 13:49:11 2011 -0500
+++ b/arm_port/hotspot/src/cpu/zero/vm/thumb2.cpp       Thu Dec 22 16:47:21 2011 +0000
@@ -4344,6 +4344,8 @@
 // Helper_SafePoint.
 void Thumb2_Safepoint(Thumb2_Info *jinfo, int stackdepth)
 {
+#if 0  // Causes maysterious segfaults
+  Thumb2_Flush(jinfo);
   int r_tmp = Thumb2_Tmp(jinfo, 0);
   mov_imm(jinfo->codebuf, r_tmp, (u32)SafepointSynchronize::address_of_state());
   ldr_imm(jinfo->codebuf, r_tmp, r_tmp, 0, 0, 0);
@@ -4355,6 +4357,7 @@
   Thumb2_restore_locals(jinfo, stackdepth);
     bcc_patch(jinfo->codebuf, COND_NE, loc);
   }
+#endif
 }

 int Thumb2_Branch(Thumb2_Info *jinfo, unsigned bci, unsigned cond, int stackdepth)