Move the fix for S6636110 to more appropriate directory. This patch is not

an IcedTea6 patch nor a security fix.

1 files changed, 76 insertions, 0 deletions

diff --git a/java/openjdk6/files/patch-sharedRuntime_x86_64.cpp b/java/openjdk6/files/patch-sharedRuntime_x86_64.cpp
new file mode 100644
index 000000000000..5e0a35091546
--- /dev/null
+++ b/java/openjdk6/files/patch-sharedRuntime_x86_64.cpp
@@ -0,0 +1,76 @@
+
+# HG changeset patch
+# User never
+# Date 1320440131 25200
+# Node ID 1feb272af3a704c03d544ef6c606db32049e492c
+# Parent 448691f285a54cd944c45c79ff0ba13ec8e3e205
+6636110: unaligned stackpointer leads to crash during deoptimization
+Reviewed-by: never, kvn
+Contributed-by: Andreas Schoesser <andreas.schoesser@sap.com>
+
+--- hotspot/src/cpu/x86/vm/sharedRuntime_x86_64.cpp.orig	Thu Nov 03 04:12:49 2011 -0700
++++ hotspot/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	Fri Nov 04 13:55:31 2011 -0700
+@@ -2797,17 +2797,25 @@ void SharedRuntime::generate_deopt_blob(
+   // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
+ 
+   // Use rbp because the frames look interpreted now
+-  __ set_last_Java_frame(noreg, rbp, NULL);
+-
++  // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
++  // Don't need the precise return PC here, just precise enough to point into this code blob.
++  address the_pc = __ pc();
++  __ set_last_Java_frame(noreg, rbp, the_pc);
++
++  __ andptr(rsp, -(StackAlignmentInBytes));  // Fix stack alignment as required by ABI
+   __ mov(c_rarg0, r15_thread);
+   __ movl(c_rarg1, r14); // second arg: exec_mode
+   __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
++  // Revert SP alignment after call since we're going to do some SP relative addressing below
++  __ movptr(rsp, Address(r15_thread, JavaThread::last_Java_sp_offset()));
+ 
+   // Set an oopmap for the call site
+-  oop_maps->add_gc_map(__ pc() - start,
++  // Use the same PC we used for the last java frame
++  oop_maps->add_gc_map(the_pc - start,
+                        new OopMap( frame_size_in_words, 0 ));
+ 
+-  __ reset_last_Java_frame(true, false);
++  // Clear fp AND pc
++  __ reset_last_Java_frame(true, true);
+ 
+   // Collect return values
+   __ movdbl(xmm0, Address(rsp, RegisterSaver::xmm0_offset_in_bytes()));
+@@ -2968,7 +2976,10 @@ void SharedRuntime::generate_uncommon_tr
+                               // Prolog
+ 
+   // Use rbp because the frames look interpreted now
+-  __ set_last_Java_frame(noreg, rbp, NULL);
++  // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
++  // Don't need the precise return PC here, just precise enough to point into this code blob.
++  address the_pc = __ pc();
++  __ set_last_Java_frame(noreg, rbp, the_pc);
+ 
+   // Call C code.  Need thread but NOT official VM entry
+   // crud.  We cannot block on this call, no GC can happen.  Call should
+@@ -2977,14 +2988,17 @@ void SharedRuntime::generate_uncommon_tr
+   //
+   // BasicType unpack_frames(JavaThread* thread, int exec_mode);
+ 
++  __ andptr(rsp, -(StackAlignmentInBytes)); // Align SP as required by ABI
+   __ mov(c_rarg0, r15_thread);
+   __ movl(c_rarg1, Deoptimization::Unpack_uncommon_trap);
+   __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
+ 
+   // Set an oopmap for the call site
+-  oop_maps->add_gc_map(__ pc() - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
+-
+-  __ reset_last_Java_frame(true, false);
++  // Use the same PC we used for the last java frame
++  oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
++
++  // Clear fp AND pc
++  __ reset_last_Java_frame(true, true);
+ 
+   // Pop self-frame.
+   __ leave();                 // Epilog
+