Preserves callee-saved FPU registers on ARM

runtime/vm/simulator_arm.cc

Index: runtime/vm/simulator_arm.cc
===================================================================
--- runtime/vm/simulator_arm.cc	(revision 27068)
+++ runtime/vm/simulator_arm.cc	(working copy)
@@ -3589,6 +3589,15 @@
   int32_t r10_val = get_register(R10);
   int32_t r11_val = get_register(R11);
 
+  double d8_val = get_dregister(D8);
+  double d9_val = get_dregister(D9);
+  double d10_val = get_dregister(D10);
+  double d11_val = get_dregister(D11);
+  double d12_val = get_dregister(D12);
+  double d13_val = get_dregister(D13);
+  double d14_val = get_dregister(D14);
+  double d15_val = get_dregister(D15);
+
   // Setup the callee-saved registers with a known value. To be able to check
   // that they are preserved properly across dart execution.
   int32_t callee_saved_value = icount_;
@@ -3601,6 +3610,16 @@
   set_register(R10, callee_saved_value);
   set_register(R11, callee_saved_value);
 
+  double callee_saved_dvalue = static_cast<double>(icount_);
+  set_dregister(D8, callee_saved_dvalue);
+  set_dregister(D9, callee_saved_dvalue);
+  set_dregister(D10, callee_saved_dvalue);
+  set_dregister(D11, callee_saved_dvalue);
+  set_dregister(D12, callee_saved_dvalue);
+  set_dregister(D13, callee_saved_dvalue);
+  set_dregister(D14, callee_saved_dvalue);
+  set_dregister(D15, callee_saved_dvalue);
+
   // Start the simulation
   Execute();
 
@@ -3614,6 +3633,15 @@
   ASSERT(callee_saved_value == get_register(R10));
   ASSERT(callee_saved_value == get_register(R11));
 
+  ASSERT(callee_saved_dvalue == get_dregister(D8));
+  ASSERT(callee_saved_dvalue == get_dregister(D9));
+  ASSERT(callee_saved_dvalue == get_dregister(D10));
+  ASSERT(callee_saved_dvalue == get_dregister(D11));
+  ASSERT(callee_saved_dvalue == get_dregister(D12));
+  ASSERT(callee_saved_dvalue == get_dregister(D13));
+  ASSERT(callee_saved_dvalue == get_dregister(D14));
+  ASSERT(callee_saved_dvalue == get_dregister(D15));
+
   // Restore callee-saved registers with the original value.
   set_register(R4, r4_val);
   set_register(R5, r5_val);
@@ -3624,6 +3652,15 @@
   set_register(R10, r10_val);
   set_register(R11, r11_val);
 
+  set_dregister(D8, d8_val);
+  set_dregister(D9, d9_val);
+  set_dregister(D10, d10_val);
+  set_dregister(D11, d11_val);
+  set_dregister(D12, d12_val);
+  set_dregister(D13, d13_val);
+  set_dregister(D14, d14_val);
+  set_dregister(D15, d15_val);
+
   // Restore the SP register and return R1:R0.
   set_register(SP, sp_before_call);
   int64_t return_value;