| // 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_X64) |
| |
| #include "vm/debugger.h" |
| |
| #include "vm/assembler.h" |
| #include "vm/cpu.h" |
| #include "vm/stub_code.h" |
| |
| namespace dart { |
| |
| 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)); |
| } |
| |
| |
| RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) { |
| // At a minimum we have the closure object on the stack. |
| ASSERT(num_actual_args > 0); |
| // Stack pointer points to last argument that was pushed on the stack. |
| uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize); |
| return reinterpret_cast<RawObject*>( |
| *reinterpret_cast<uword*>(closure_addr)); |
| } |
| |
| |
| void CodeBreakpoint::PatchFunctionReturn() { |
| uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 13); |
| ASSERT((code[0] == 0x4c) && (code[1] == 0x8b) && (code[2] == 0x7d) && |
| (code[3] == 0xf0)); // movq r15,[rbp-0x10] |
| ASSERT((code[4] == 0x48) && (code[5] == 0x89) && |
| (code[6] == 0xec)); // mov rsp, rbp |
| ASSERT(code[7] == 0x5d); // pop rbp |
| ASSERT(code[8] == 0xc3); // ret |
| ASSERT((code[9] == 0x0F) && (code[10] == 0x1F) && (code[11] == 0x40) && |
| (code[12] == 0x00)); // nops |
| // Smash code with call instruction and relative target address. |
| uword stub_addr = StubCode::BreakpointReturnEntryPoint(); |
| code[0] = 0x49; |
| code[1] = 0xbb; |
| *reinterpret_cast<uword*>(&code[2]) = stub_addr; |
| code[10] = 0x41; |
| code[11] = 0xff; |
| code[12] = 0xd3; |
| CPU::FlushICache(pc_ - 13, 13); |
| } |
| |
| |
| void CodeBreakpoint::RestoreFunctionReturn() { |
| uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 13); |
| ASSERT((code[0] == 0x49) && (code[1] == 0xbb)); |
| |
| MemoryRegion code_region(reinterpret_cast<void*>(pc_ - 13), 13); |
| Assembler assembler; |
| |
| assembler.ReturnPatchable(); |
| assembler.FinalizeInstructions(code_region); |
| |
| CPU::FlushICache(pc_ - 13, 13); |
| } |
| |
| } // namespace dart |
| |
| #endif // defined TARGET_ARCH_X64 |