MIPS: Added the stop() instruction with same behavior as on Arm simulator.

src/mips/simulator-mips.h

Index: src/mips/simulator-mips.h
diff --git a/src/mips/simulator-mips.h b/src/mips/simulator-mips.h
index 21476dccb5523b82020525f8cb26a1972aaf9e48..8d0d574496df733cc38609ce1e8837e02acaf53b 100644
--- a/src/mips/simulator-mips.h
+++ b/src/mips/simulator-mips.h
@@ -289,6 +289,18 @@ class Simulator {
   // Used for breakpoints and traps.
   void SoftwareInterrupt(Instruction* instr);
 
+  // Stop helper functions.

[Søren Thygesen Gjesse, 2011/05/26 07:11:50]

isWatchpoint with uppercase I (two more below).

+  bool isWatchpoint(uint32_t code);
+  void PrintWatchpoint(uint32_t code);
+  void HandleStop(uint32_t code, Instruction* instr);
+  bool isStopInstruction(Instruction* instr);
+  bool isEnabledStop(uint32_t code);
+  void EnableStop(uint32_t code);
+  void DisableStop(uint32_t code);
+  void IncreaseStopCounter(uint32_t code);
+  void PrintStopInfo(uint32_t code);
+
+
   // Executes one instruction.
   void InstructionDecode(Instruction* instr);
   // Execute one instruction placed in a branch delay slot.
@@ -354,6 +366,19 @@ class Simulator {
   // Registered breakpoints.
   Instruction* break_pc_;
   Instr break_instr_;
+
+  // Stop is disabled if bit 31 is set.
+  static const uint32_t kStopDisabledBit = 1 << 31;
+
+  // A stop is enabled, meaning the simulator will stop when meeting the
+  // instruction, if bit 31 of watched_stops[code].count is unset.
+  // The value watched_stops[code].count & ~(1 << 31) indicates how many times
+  // the breakpoint was hit or gone through.
+  struct StopCountAndDesc {
+    uint32_t count;
+    char* desc;
+  };
+  StopCountAndDesc watched_stops[kMaxStopCode + 1];
 };