//

// DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

//

// This code is free software; you can redistribute it and/or modify it

// under the terms of the GNU General Public License version 2 only, as

// published by the Free Software Foundation.

//

// This code is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// version 2 for more details (a copy is included in the LICENSE file that

// accompanied this code).

//

// You should have received a copy of the GNU General Public License version

// 2 along with this work; if not, write to the Free Software Foundation,

// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

//

//

//

// AMD64 Linux Architecture Description File

//----------OS-DEPENDENT ENCODING BLOCK----------------------------------------

// This block specifies the encoding classes used by the compiler to

// output byte streams.  Encoding classes generate functions which are

// called by Machine Instruction Nodes in order to generate the bit

// encoding of the instruction.  Operands specify their base encoding

// interface with the interface keyword.  There are currently

// supported four interfaces, REG_INTER, CONST_INTER, MEMORY_INTER, &

// COND_INTER.  REG_INTER causes an operand to generate a function

// which returns its register number when queried.  CONST_INTER causes

// an operand to generate a function which returns the value of the

// constant when queried.  MEMORY_INTER causes an operand to generate

// four functions which return the Base Register, the Index Register,

// the Scale Value, and the Offset Value of the operand when queried.

// COND_INTER causes an operand to generate six functions which return

// the encoding code (ie - encoding bits for the instruction)

// associated with each basic boolean condition for a conditional

// instruction.  Instructions specify two basic values for encoding.

// They use the ins_encode keyword to specify their encoding class

// (which must be one of the class names specified in the encoding

// block), and they use the opcode keyword to specify, in order, their

// primary, secondary, and tertiary opcode.  Only the opcode sections

// which a particular instruction needs for encoding need to be

// specified.

encode %{

  // Build emit functions for each basic byte or larger field in the intel

  // encoding scheme (opcode, rm, sib, immediate), and call them from C++

  // code in the enc_class source block.  Emit functions will live in the

  // main source block for now.  In future, we can generalize this by

  // adding a syntax that specifies the sizes of fields in an order,

  // so that the adlc can build the emit functions automagically

  enc_class Java_To_Runtime(method meth)

  %{

    // No relocation needed

    // movq r10, <meth>

    emit_opcode(cbuf, Assembler::REX_WB);

    emit_opcode(cbuf, 0xB8 | (R10_enc - 8));

    emit_d64(cbuf, (int64_t) $meth$$method);

    // call (r10)

    emit_opcode(cbuf, Assembler::REX_B);

    emit_opcode(cbuf, 0xFF);

    emit_opcode(cbuf, 0xD0 | (R10_enc - 8));

  %}

  enc_class linux_breakpoint

  %{

    MacroAssembler* masm = new MacroAssembler(&cbuf);

    masm->call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

  %}

  enc_class call_epilog

  %{

    if (VerifyStackAtCalls) {

      // Check that stack depth is unchanged: find majik cookie on stack

      int framesize =

        ra_->reg2offset_unchecked(OptoReg::add(ra_->_matcher._old_SP, -3*VMRegImpl::slots_per_word));

      if (framesize) {

        if (framesize < 0x80) {

          emit_opcode(cbuf, Assembler::REX_W);

          emit_opcode(cbuf, 0x81); // cmpq [rsp+0],0xbadb1ood

          emit_d8(cbuf, 0x7C);

          emit_d8(cbuf, 0x24);

          emit_d8(cbuf, framesize); // Find majik cookie from ESP

          emit_d32(cbuf, 0xbadb100d);

        } else {

          emit_opcode(cbuf, Assembler::REX_W);

          emit_opcode(cbuf, 0x81); // cmpq [rsp+0],0xbadb1ood

          emit_d8(cbuf, 0xBC);

          emit_d8(cbuf, 0x24);

          emit_d32(cbuf, framesize); // Find majik cookie from ESP

          emit_d32(cbuf, 0xbadb100d);

        }

      }

      // jmp EQ around INT3

      // QQQ TODO

      const int jump_around = 5; // size of call to breakpoint, 1 for CC

      emit_opcode(cbuf, 0x74);

      emit_d8(cbuf, jump_around);

      // QQQ temporary

      emit_break(cbuf);

      // Die if stack mismatch

      // emit_opcode(cbuf,0xCC);

    }

  %}

%}

// INSTRUCTIONS -- Platform dependent

//----------OS and Locking Instructions----------------------------------------

// This name is KNOWN by the ADLC and cannot be changed.

// The ADLC forces a 'TypeRawPtr::BOTTOM' output type

// for this guy.

instruct tlsLoadP(r15_RegP dst)

%{

  match(Set dst (ThreadLocal));

  effect(DEF dst);

  size(0);

  format %{ "# TLS is in R15" %}

  ins_encode( /*empty encoding*/ );

  ins_pipe(ialu_reg_reg);

%}

// Die now

instruct ShouldNotReachHere()

%{

  match(Halt);

  // Use the following format syntax

  format %{ "int3\t# ShouldNotReachHere" %}

  // QQQ TODO for now call breakpoint

  // opcode(0xCC);

  // ins_encode(Opc);

  ins_encode(linux_breakpoint);

  ins_pipe(pipe_slow);

%}

// Platform dependent source

source

%{

int MachCallRuntimeNode::ret_addr_offset() {

  return 13; // movq r10,#addr; callq (r10)

}

// emit an interrupt that is caught by the debugger

void emit_break(CodeBuffer& cbuf) {

  // Debugger doesn't really catch this but best we can do so far QQQ

  MacroAssembler* masm = new MacroAssembler(&cbuf);

  masm->call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

}

void MachBreakpointNode::emit(CodeBuffer& cbuf, PhaseRegAlloc* ra_) const {

  emit_break(cbuf);

}

uint MachBreakpointNode::size(PhaseRegAlloc* ra_) const {

  return 5;

}

%}