Allows "Hello, world!" to run on ARM hardware.

runtime/vm/assembler_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/simulator.h"
 #include "vm/runtime_entry.h"
@@ skipping 551 matching lines @@
 
 
 void Assembler::ldm(BlockAddressMode am, Register base, RegList regs,
                     Condition cond) {
   EmitMultiMemOp(cond, am, true, base, regs);
 }
 
 
 void Assembler::stm(BlockAddressMode am, Register base, RegList regs,
                     Condition cond) {
+  ASSERT(regs != 0);
   EmitMultiMemOp(cond, am, false, base, regs);
 }
 
 
 void Assembler::ldrex(Register rt, Register rn, Condition cond) {
   ASSERT(rn != kNoRegister);
   ASSERT(rt != kNoRegister);
   ASSERT(cond != kNoCondition);
   int32_t encoding = (static_cast<int32_t>(cond) << kConditionShift) |
                      B24 |
@@ skipping 566 matching lines @@
 
 
 void Assembler::svc(uint32_t imm24, Condition cond) {
   ASSERT(cond != kNoCondition);
   ASSERT(imm24 < (1 << 24));
   int32_t encoding = (cond << kConditionShift) | B27 | B26 | B25 | B24 | imm24;
   Emit(encoding);
 }
 
 
-void Assembler::bkpt(uint16_t imm16, Condition cond) {
-  ASSERT(cond != kNoCondition);
-  int32_t encoding = (cond << kConditionShift) | B24 | B21 |
+void Assembler::bkpt(uint16_t imm16) {
+  // bkpt requires that the cond field is AL.
+  int32_t encoding = (AL << kConditionShift) | B24 | B21 |
                      ((imm16 >> 4) << 8) | B6 | B5 | B4 | (imm16 & 0xf);
   Emit(encoding);
 }
 
 
 void Assembler::b(Label* label, Condition cond) {
   EmitBranch(cond, label, false);
 }
 
 
@@ skipping 955 matching lines @@
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM