blob: 67a9e97fd01fb220be552bf877e63e811789fe6f [file] [log] [blame]
// 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