Implement long jump in ARM and MIPS simulators.

runtime/vm/stub_code_arm.cc

Index: runtime/vm/stub_code_arm.cc
===================================================================
--- runtime/vm/stub_code_arm.cc	(revision 21660)
+++ runtime/vm/stub_code_arm.cc	(working copy)
@@ -1474,16 +1474,39 @@
 
 
 // Jump to the exception handler.
-// No Result.
+// LR: return address.
+// R0: program_counter.
+// R1: stack_pointer.
+// R2: frame_pointer.
+// R3: error object.
+// SP: address of stacktrace object.
+// Does not return.
 void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
-  __ Unimplemented("JumpToExceptionHandler Stub");
+  ASSERT(kExceptionObjectReg == R0);
+  ASSERT(kStackTraceObjectReg == R1);
+  __ mov(LR, ShifterOperand(R0));  // Program counter.
+  __ mov(R0, ShifterOperand(R3));  // Error object.
+  __ ldr(R1, Address(SP, 0));  // Error object.

[zra, 2013/04/18 15:45:25]

Stacktrace object?

[regis, 2013/04/18 16:18:27]

Done.

+  __ mov(FP, ShifterOperand(R2));  // Frame_pointer.
+  __ mov(SP, ShifterOperand(R1));  // Stack pointer.

[zra, 2013/04/18 15:45:25]

Is R1 the stack pointer here? I thought it was already the stacktrace object.

[regis, 2013/04/18 16:18:27]

Good catch! This stub is only used when running on the hardware, so I did not
notice the clobbering yet :-)

+  __ bx(LR);  // Jump to the exception handler code.
 }
 
 
 // Jump to the error handler.
-// No Result.
+// LR: return address.
+// R0: program_counter.
+// R1: stack_pointer.
+// R2: frame_pointer.
+// R3: error object.
+// Does not return.
 void StubCode::GenerateJumpToErrorHandlerStub(Assembler* assembler) {
-  __ Unimplemented("JumpToErrorHandler Stub");
+  ASSERT(kExceptionObjectReg == R0);
+  __ mov(LR, ShifterOperand(R0));  // Program counter.
+  __ mov(R0, ShifterOperand(R3));  // Error object.
+  __ mov(FP, ShifterOperand(R2));  // Frame_pointer.
+  __ mov(SP, ShifterOperand(R1));  // Stack pointer.
+  __ bx(LR);  // Jump to the exception handler code.
 }