| // Copyright (c) 2011, 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/cpu.h" |
| #include "vm/debugger.h" |
| #include "vm/instructions.h" |
| #include "vm/stub_code.h" |
| |
| namespace dart { |
| |
| // TODO(hausner): Handle captured variables. |
| RawInstance* ActivationFrame::GetLocalVarValue(intptr_t slot_index) { |
| uword var_address = fp() + slot_index * kWordSize; |
| return reinterpret_cast<RawInstance*>( |
| *reinterpret_cast<uword*>(var_address)); |
| } |
| |
| |
| RawInstance* ActivationFrame::GetInstanceCallReceiver( |
| intptr_t num_actual_args) { |
| ASSERT(num_actual_args > 0); // At minimum we have a receiver on the stack. |
| // Stack pointer points to last argument that was pushed on the stack. |
| uword receiver_addr = sp() + ((num_actual_args - 1) * kWordSize); |
| return reinterpret_cast<RawInstance*>( |
| *reinterpret_cast<uword*>(receiver_addr)); |
| } |
| |
| |
| void CodeBreakpoint::PatchFunctionReturn() { |
| uword* code = reinterpret_cast<uword*>(pc_ - 3 * Instr::kInstrSize); |
| ASSERT(code[0] == 0xe8bd4c00); // ldmia sp!, {pp, fp, lr} |
| ASSERT(code[1] == 0xe28dd004); // add sp, sp, #4 |
| ASSERT(code[2] == 0xe12fff1e); // bx lr |
| |
| // Smash code with call instruction and target address. |
| uword stub_addr = StubCode::BreakpointReturnEntryPoint(); |
| uint16_t target_lo = stub_addr & 0xffff; |
| uint16_t target_hi = stub_addr >> 16; |
| uword movw = 0xe300c000 | ((target_lo >> 12) << 16) | (target_lo & 0xfff); |
| uword movt = 0xe340c000 | ((target_hi >> 12) << 16) | (target_hi & 0xfff); |
| uword blx = 0xe12fff3c; |
| code[0] = movw; // movw ip, #target_lo |
| code[1] = movt; // movt ip, #target_hi |
| code[2] = blx; // blx ip |
| CPU::FlushICache(pc_ - 3 * Instr::kInstrSize, 3 * Instr::kInstrSize); |
| } |
| |
| |
| void CodeBreakpoint::RestoreFunctionReturn() { |
| uword* code = reinterpret_cast<uword*>(pc_ - 3 * Instr::kInstrSize); |
| ASSERT((code[0] & 0xfff0f000) == 0xe300c000); |
| code[0] = 0xe8bd4c00; // ldmia sp!, {pp, fp, lr} |
| code[1] = 0xe28dd004; // add sp, sp, #4 |
| code[2] = 0xe12fff1e; // bx lr |
| CPU::FlushICache(pc_ - 3 * Instr::kInstrSize, 3 * Instr::kInstrSize); |
| } |
| |
| } // namespace dart |
| |
| #endif // defined TARGET_ARCH_ARM |